import observable = require("data/observable");
import bindable = require("ui/core/bindable");
import dependencyObservableModule = require("ui/core/dependency-observable");
import TKUnit = require("../TKUnit");
import types = require("utils/types");
import helper = require("../ui/helper");
import viewModule = require("ui/core/view");
import buttonModule = require("ui/button");
import utils = require("utils/utils");
import pageModule = require("ui/page");
import stackLayoutModule = require("ui/layouts/stack-layout");
import bindingBuilder = require("ui/builder/binding-builder");
import labelModule = require("ui/label");
import textFieldModule = require("ui/text-field");
import fs = require("file-system");
import appModule = require("application");
import trace = require("trace");

// <snippet module="ui/core/bindable" title="bindable">
// For information and examples how to use bindings please refer to special [**Data binding**](../../../../bindings.md) topic. 
// </snippet>

// <snippet module="ui/core/weak-event-listener" title="weak-event-listener">
// For information and example how to use weak event listeners please refer to special [**Events**](../../../../events.md) topic which has a dedicated part about weak event listeners. 
// </snippet>

export var test_Bindable_Members = function () {
    var obj = new bindable.Bindable();
    TKUnit.assert(types.isDefined(obj.bind), "Bindable.bind not defined");
    TKUnit.assert(types.isDefined(obj.unbind), "Bindable.unbind not defined");
    TKUnit.assert(types.isDefined(obj._updateTwoWayBinding), "Bindable.updateTwoWayBinding not defined");
}

export var test_Bindable_Bind_ToTarget_OneWay = function () {
    var model = new observable.Observable();
    model.set("name", "John");

    var options: bindable.BindingOptions = {
        sourceProperty: "name",
        targetProperty: "test"
    }

    var obj = new bindable.Bindable();
    obj.bind(options, model);

    TKUnit.assert(obj.get("test") === "John", "Expected result after binding is [test value] === 'John'");

    model.set("name", "Changed");

    TKUnit.assert(obj.get("test") === "Changed", "Expected result after binding is [test value] === 'Changed'");
}

export var test_Bindable_Bind_ToTarget_TwoWay = function () {
    var model = new observable.Observable();
    model.set("name", "John");

    var options: bindable.BindingOptions = {
        sourceProperty: "name",
        targetProperty: "test",
        twoWay: true
    }

    var obj = new bindable.Bindable();
    obj.bind(options, model);
    obj.set("test", "Changed");

    TKUnit.assert(model.get("name") === "Changed", "Two-way binding not updating the source when target is changed.");

    model.set("name", "John");

    TKUnit.assert(obj.get("test") === "John", "Two-way binding not updating the target when source is changed.");
}

export var test_Bindable_Bind_ToBindingContext_OneWay = function () {
    var model = new observable.Observable();
    model.set("name", "John");

    var options: bindable.BindingOptions = {
        sourceProperty: "name",
        targetProperty: "test"
    }

    var obj = new bindable.Bindable();
    obj.bind(options);
    obj.set("test", "local");
    obj.bindingContext = model;

    TKUnit.assert(obj.get("test") === "John", "Binding to a context does not update the target property.");
}

export var test_Bindable_Bind_ToBindingContext_TwoWay = function () {
    var model = new observable.Observable();
    model.set("name", "John");

    var options: bindable.BindingOptions = {
        sourceProperty: "name",
        targetProperty: "test",
        twoWay: true
    }

    var obj = new bindable.Bindable();
    obj.bind(options);

    obj.set("test", "local");
    obj.bindingContext = model;

    TKUnit.assert(obj.get("test") === "John", "Binding to a context does not update the target property.");

    obj.set("test", "local");

    TKUnit.assert(model.get("name") === "local", "Two-way binding to a context does not update the source property.");
}

export var test_Bindable_Unbind = function () {
    var model = new observable.Observable();

    var options: bindable.BindingOptions = {
        sourceProperty: "name",
        targetProperty: "test"
    }

    var obj = new bindable.Bindable();
    obj.bind(options, model);

    model.set("name", "John");

    TKUnit.assert(obj.get("test") === "John", "Binding does not updates target property.");

    obj.unbind("test");
    model.set("name", "Chaged");

    TKUnit.assert(obj.get("test") === "John", "Unbind does not remove binding.");
}

export var test_bind_NoSource_WillUse_BindingContext = function () {
    var model = new observable.Observable();
    model.set("testProperty", "testValue");

    var test = function (views: Array<viewModule.View>) {
        views[0].bindingContext = model;
        views[1].bind({
            sourceProperty: "testProperty",
            targetProperty: "text"
        });

        var button = <buttonModule.Button>views[1];
        TKUnit.assert(button.text === model.get("testProperty"), "Bind method not working when no source is passed but a valid bindingContext is present.");
    }

    helper.do_PageTest_WithButton(test);
}

export var test_bindingContext_ValueSource_IsInherited = function () {
    var test = function (views: Array<viewModule.View>) {
        var context = {};
        views[0].bindingContext = context;
        TKUnit.assert(views[1].bindingContext === context, "bindingContext not inherited.");
        TKUnit.assert(views[1]._getValueSource(bindable.Bindable.bindingContextProperty) === dependencyObservableModule.ValueSource.Inherited, "bindingContext should be propagated as Inherited.");
    }

    helper.do_PageTest_WithButton(test);
}

export var test_bindingContext_Change_IsReflected_Properly = function () {
    var model = new observable.Observable();
    model.set("testProperty", "testValue");

    var test = function (views: Array<viewModule.View>) {
        views[1].bind({
            sourceProperty: "testProperty",
            targetProperty: "text"
        });

        var button = <buttonModule.Button>views[1];
        TKUnit.assert(button.text === "", "Bind should do nothing when no source and binding context are available.");

        views[0].bindingContext = model;
        TKUnit.assert(button.text === "testValue", "Binding not updated properly when a valid bindingContext is provided.");

        views[0].bindingContext = undefined;
        model.set("testProperty", "updatedValue");
        TKUnit.assertEqual(button.text, "", "Binding not properly detached when bindingContext is cleared.");
    }

    helper.do_PageTest_WithButton(test);
}

export function test_WhenBindingIsSetToAnElement_AndElementIsRemoved_ShouldBeCollectedByGC(done) {
    let testFinished = false;

    let page = helper.getCurrentPage();
    let stack = new stackLayoutModule.StackLayout();

    let expectedValue = "testValue";
    let sourcePropertyName = "testProperty";
    let targetPropertyName = "text";

    stack.on(viewModule.View.loadedEvent, () => {
        var model = new observable.Observable();
        model.set(sourcePropertyName, expectedValue);

        function createButton(bindContext) {
            let button = new buttonModule.Button();
            button.bind({
                sourceProperty: sourcePropertyName,
                targetProperty: targetPropertyName
            }, bindContext);
            return new WeakRef(button);
        }

        var weakRef = createButton(model);

        try {
            stack.addChild(weakRef.get());
            TKUnit.assertEqual(weakRef.get().text, expectedValue, "Binding is not working properly!");
            stack.removeChild(weakRef.get());
            TKUnit.waitUntilReady(() => { return !weakRef.get().isLoaded });
            utils.GC();
            TKUnit.assert(!weakRef.get(), "UIElement is still alive!");
            testFinished = true;
        }
        catch (e) {
            done(e);
        }
    });

    page.content = stack;

    TKUnit.waitUntilReady(() => { return testFinished });
    done(null);
}

export function test_OneBindableToBindMoreThanOneProperty_ToSameSource() {
    var model = new observable.Observable();

    var firstPropertyOptions: bindable.BindingOptions = {
        sourceProperty: "name",
        targetProperty: "test"
    }

    var secondPropertyOptions: bindable.BindingOptions = {
        sourceProperty: "sourceProperty",
        targetProperty: "targetProperty"
    }

    var obj = new bindable.Bindable();
    obj.bind(firstPropertyOptions, model);
    obj.bind(secondPropertyOptions, model);

    model.set("name", "John");
    model.set("sourceProperty", "testValue");

    TKUnit.assertEqual(obj.get("test"), "John", "Binding does not updates target property.");
    TKUnit.assertEqual(obj.get("targetProperty"), "testValue", "Binding does not updates target property1.");
}

export var test_MoreThanOneBindables_BindToASameSourceAndProperty = function () {
    var model = new observable.Observable();

    var bindingOptions: bindable.BindingOptions = {
        sourceProperty: "sourceProperty",
        targetProperty: "targetProperty"
    };

    var obj1 = new bindable.Bindable();
    obj1.bind(bindingOptions, model);

    var obj2 = new bindable.Bindable();
    obj2.bind(bindingOptions, model);

    model.set("sourceProperty", "testValue");

    TKUnit.assertEqual(obj1.get("targetProperty"), "testValue", "Binding does not updates target property for first object.");
    TKUnit.assertEqual(obj2.get("targetProperty"), "testValue", "Binding does not updates target property for second object.");
}

class TestClass extends bindable.Bindable {
    private _value: string;
    get value(): string {
        return this._value
    }
    set value(v: string) {
        if (v === "invalid") {
            throw new Error("Trying to set invalid value.");
        }
        this._value = v;
    }
};

export function test_WhenBindingSetsInvalidValue_NoExptionIsThrown() {
    var model = new observable.Observable();

    var options: bindable.BindingOptions = {
        sourceProperty: "value",
        targetProperty: "value"
    }

    var obj = new TestClass();
    obj.bind(options, model);

    model.set("value", "valid");
    TKUnit.assert(obj.get("value") === "valid");

    // Try set invalid value - no exception should be thrown and the value should remain the same.
    model.set("value", "invalid");
    TKUnit.assert(obj.get("value") === "valid");
}

export var test_binding_bindingContext_setRootContextFirst = function () {
    var test = function (views: Array<viewModule.View>) {
        var rootContext = new observable.Observable();
        rootContext.set("selectedItem", "item 1");
        views[0].bindingContext = rootContext;

        var stack = <stackLayoutModule.StackLayout>views[1];
        var options: bindable.BindingOptions = {
            sourceProperty: "selectedItem",
            targetProperty: "bindingContext"
        }
        stack.bind(options);

        TKUnit.assertEqual(stack.bindingContext, "item 1", "Initial binding value");
        TKUnit.assertEqual(views[2].bindingContext, "item 1", "Initial binding value");

        rootContext.set("selectedItem", "item 2");

        TKUnit.assertEqual(stack.bindingContext, "item 2", "Changed binding value");
        TKUnit.assertEqual(views[2].bindingContext, "item 2", "Changed binding value");
    }

    helper.do_PageTest_WithStackLayout_AndButton(test);
}

export var test_binding_bindingContext_setBindingFirst = function () {
    var test = function (views: Array<viewModule.View>) {
        var rootContext = new observable.Observable();
        rootContext.set("selectedItem", "item 1");

        var stack = <stackLayoutModule.StackLayout>views[1];
        var options: bindable.BindingOptions = {
            twoWay: true,
            sourceProperty: "selectedItem",
            targetProperty: "bindingContext"
        }
        stack.bind(options);

        views[0].bindingContext = rootContext;

        TKUnit.assertEqual(stack.bindingContext, "item 1", "Initial binding value");
        TKUnit.assertEqual(views[2].bindingContext, "item 1", "Initial binding value");

        rootContext.set("selectedItem", "item 2");

        TKUnit.assertEqual(stack.bindingContext, "item 2", "Changed binding value");
        TKUnit.assertEqual(views[2].bindingContext, "item 2", "Changed binding value");
    }

    helper.do_PageTest_WithStackLayout_AndButton(test);
}

export var test_Bindable_BindingContext_Number_DoesNotThrow = function () {
    var obj = new bindable.Bindable();
    obj.bindingContext = 42;
}

export var test_Bindable_BindingContext_Boolean_DoesNotThrow = function () {
    var obj = new bindable.Bindable();
    obj.bindingContext = true;
}

export var test_Bindable_BindingContext_String_DoesNotThrow = function () {
    var options: bindable.BindingOptions = {
        sourceProperty: "length",
        targetProperty: "test"
    }

    var obj = new bindable.Bindable();
    obj.bind(options);
    obj.set("test", "local");
    obj.bindingContext = "string";

    TKUnit.assert(obj.get("test") === 6, "Expected: 6; Actual: " + obj.get("test"));
}

export var test_getBindableOptionsFromStringFullFormat = function () {
    var bindingExpression = "bindProperty, bindProperty * 2, false";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);

    TKUnit.assert(bindOptions.sourceProperty === "bindProperty", "Expected: bindProperty, Actual: " + bindOptions.sourceProperty);
    TKUnit.assert(bindOptions.targetProperty === "targetBindProperty", "Expected: targetBindProperty, Actual: " + bindOptions.targetProperty);
    TKUnit.assert(bindOptions.expression === "bindProperty * 2", "Expected: bindProperty * 2, Actual:" + bindOptions.expression);
    TKUnit.assert(bindOptions.twoWay === false, "Expected: false, Actual: " + bindOptions.twoWay);
}

export var test_getBindableOptionsFromStringShortFormatExpression = function () {
    var bindingExpression = "bindProperty * 2";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);

    TKUnit.assert(bindOptions.sourceProperty === "$value", "Expected: bindProperty, Actual: " + bindOptions.sourceProperty);
    TKUnit.assert(bindOptions.targetProperty === "targetBindProperty", "Expected: targetBindProperty, Actual: " + bindOptions.targetProperty);
    TKUnit.assert(bindOptions.expression === "bindProperty * 2", "Expected: bindProperty * 2, Actual: " + bindOptions.expression);
    TKUnit.assert(bindOptions.twoWay === true, "Expected: true, Actual: " + bindOptions.twoWay);
}

export var test_getBindableOptionsFromStringShortFormatProperty = function () {
    var bindingExpression = "bindProperty";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);

    TKUnit.assert(bindOptions.sourceProperty === "bindProperty", "Expected: bindProperty, Actual: " + bindOptions.sourceProperty);
    TKUnit.assert(bindOptions.targetProperty === "targetBindProperty", "Expected: targetBindProperty, Actual: " + bindOptions.targetProperty);
    TKUnit.assert(bindOptions.expression === undefined, "Expected: null, Actual: " + bindOptions.expression);
    TKUnit.assert(bindOptions.twoWay === true, "Expected: true, Actual: " + bindOptions.twoWay);
}

export var test_getBindableOptionsFromStringTwoParamsFormat = function () {
    var bindingExpression = "bindProperty, bindProperty * 2";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);

    TKUnit.assert(bindOptions.sourceProperty === "bindProperty", "Expected: bindProperty, Actual: " + bindOptions.sourceProperty);
    TKUnit.assert(bindOptions.targetProperty === "targetBindProperty", "Expected: targetBindProperty, Actual: " + bindOptions.targetProperty);
    TKUnit.assert(bindOptions.expression === "bindProperty * 2", "Expected: bindProperty * 2, Actual:" + bindOptions.expression);
    TKUnit.assert(bindOptions.twoWay === true, "Expected: true, Actual: " + bindOptions.twoWay);
}

export var test_getBindableOptionsFromStringFullNamedFormat = function () {
    var bindingExpression = "bindProperty, expression = bindProperty * 2, twoWay = false";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);

    TKUnit.assert(bindOptions.sourceProperty === "bindProperty", "Expected: bindProperty, Actual: " + bindOptions.sourceProperty);
    TKUnit.assert(bindOptions.targetProperty === "targetBindProperty", "Expected: targetBindProperty, Actual: " + bindOptions.targetProperty);
    TKUnit.assert(bindOptions.expression === "bindProperty * 2", "Expected: bindProperty * 2, Actual:" + bindOptions.expression);
    TKUnit.assert(bindOptions.twoWay === false, "Expected: false, Actual: " + bindOptions.twoWay);
}

export var test_getBindableOptionsFromStringShortNamedFormatExpression = function () {
    var bindingExpression = "sourceProperty = bindProperty, expression = bindProperty * 2";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);

    TKUnit.assert(bindOptions.sourceProperty === "bindProperty", "Expected: bindProperty, Actual: " + bindOptions.sourceProperty);
    TKUnit.assert(bindOptions.targetProperty === "targetBindProperty", "Expected: targetBindProperty, Actual: " + bindOptions.targetProperty);
    TKUnit.assert(bindOptions.expression === "bindProperty * 2", "Expected: bindProperty * 2, Actual: " + bindOptions.expression);
    TKUnit.assert(bindOptions.twoWay === true, "Expected: true, Actual: " + bindOptions.twoWay);
}

export var test_getBindableOptionsFromStringShortNamedFormatProperty = function () {
    var bindingExpression = "sourceProperty = bindProperty";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);
    TKUnit.assert(bindOptions.sourceProperty === "bindProperty", "Expected: bindProperty, Actual: " + bindOptions.sourceProperty);
    TKUnit.assert(bindOptions.targetProperty === "targetBindProperty", "Expected: targetBindProperty, Actual: " + bindOptions.targetProperty);
    TKUnit.assert(bindOptions.expression === undefined, "Expected: null, Actual: " + bindOptions.expression);
    TKUnit.assert(bindOptions.twoWay === true, "Expected: true, Actual: " + bindOptions.twoWay);
}

export var test_getBindableOptionsFromStringTwoParamsNamedFormat = function () {
    var bindingExpression = "bindProperty, expression = bindProperty * 2";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);

    TKUnit.assert(bindOptions.sourceProperty === "bindProperty", "Expected: bindProperty, Actual: " + bindOptions.sourceProperty);
    TKUnit.assert(bindOptions.targetProperty === "targetBindProperty", "Expected: targetBindProperty, Actual: " + bindOptions.targetProperty);
    TKUnit.assert(bindOptions.expression === "bindProperty * 2", "Expected: bindProperty * 2, Actual:" + bindOptions.expression);
    TKUnit.assert(bindOptions.twoWay === true, "Expected: true, Actual: " + bindOptions.twoWay);
}

export var test_getBindingOptionsFromStringWithFunctionWitnMoreParams = function () {
    var bindingExpression = "bindProperty, converter(bindProperty, param1)";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);

    TKUnit.assertEqual(bindOptions.sourceProperty, "bindProperty");
    TKUnit.assertEqual(bindOptions.targetProperty, "targetBindProperty");
    TKUnit.assertEqual(bindOptions.expression, "converter(bindProperty, param1)");
    TKUnit.assertEqual(bindOptions.twoWay, true);
}

export var test_getBindingOptionsFromStringWithFunctionArrayParams = function () {
    var bindingExpression = "bindProperty, converter(bindProperty, [param1, param2])";
    var bindOptions = bindingBuilder.getBindingOptions("targetBindProperty", bindingExpression);

    TKUnit.assertEqual(bindOptions.sourceProperty, "bindProperty");
    TKUnit.assertEqual(bindOptions.targetProperty, "targetBindProperty");
    TKUnit.assertEqual(bindOptions.expression, "converter(bindProperty, [param1, param2])");
    TKUnit.assertEqual(bindOptions.twoWay, true);
}

export var test_bindingToNestedPropertyWithValueSyntax = function () {
    var bindingSource = new observable.Observable();
    bindingSource.set("testProperty", "testValue");

    var testElement = new bindable.Bindable();
    testElement.bind({
        sourceProperty: "$value.testProperty",
        targetProperty: "targetPropertyName"
    }, bindingSource);

    TKUnit.assertEqual(testElement.get("targetPropertyName"), "testValue");
    TKUnit.assertTrue(bindingSource['$value'] === undefined, "We should not add $value to bindingSource.");
}

export var test_TwoElementsBindingToSameBindingContext = function () {
    var testFunc = function (page: pageModule.Page) {
        var upperStackLabel = <labelModule.Label>(page.getViewById("upperStackLabel"));
        var label1 = <labelModule.Label>(page.getViewById("label1"));
        var label2 = <labelModule.Label>(page.getViewById("label2"));

        TKUnit.assertEqual(upperStackLabel.text, label1.text);
        TKUnit.assertEqual(upperStackLabel.text, label2.text);
    }
    var moduleName = __dirname.substr(fs.knownFolders.currentApp().path.length);
    helper.navigateToModuleAndRunTest(("." + moduleName + "/bindingContext_testPage"), null, testFunc);
}

export var test_BindingContext_NavigatingForwardAndBack = function () {
    var expectedValue = "Tralala";
    var testFunc = function (page: pageModule.Page) {
        var innerTestFunc = function (childPage: pageModule.Page) {
            var testTextField: textFieldModule.TextField = <textFieldModule.TextField>(childPage.getViewById("testTextField"));
            testTextField.text = expectedValue;
        };
        var moduleName = __dirname.substr(fs.knownFolders.currentApp().path.length);
        helper.navigateToModuleAndRunTest(("." + moduleName + "/bindingContext_testPage2"), page.bindingContext, innerTestFunc);
        var testLabel: labelModule.Label = <labelModule.Label>(page.getViewById("testLabel"));
        TKUnit.assertEqual(testLabel.text, expectedValue);
    }

    var moduleName = __dirname.substr(fs.knownFolders.currentApp().path.length);
    helper.navigateToModuleAndRunTest(("." + moduleName + "/bindingContext_testPage1"), null, testFunc);
}

export var test_BindingToSource_FailsAfterBindingContextChange = function () {
    var createLabel = function () {
        var label = new labelModule.Label();
        return label;
    }
    var labelViewModel = new observable.Observable();
    var expectedValue = "testValue";
    labelViewModel.set("testProperty", expectedValue);

    var testFunc = function (views: Array<viewModule.View>) {
        var testLabel = <labelModule.Label>(views[0]);
        testLabel.bind({ sourceProperty: "testProperty", targetProperty: "text" }, labelViewModel);

        var page = <pageModule.Page>(views[1]);
        page.bindingContext = new observable.Observable;

        TKUnit.assertEqual(testLabel.text, expectedValue);
    }

    helper.buildUIAndRunTest(createLabel(), testFunc);
}

export var test_BindingToParentView_ShouldNotLeaveGarbageInViewModel = function () {
    var createStack = function () {
        var stack = new stackLayoutModule.StackLayout();
        var label = new labelModule.Label();
        stack.addChild(label);
        return stack;
    }
    var stackViewModel = new observable.Observable();
    var expectedValue = "testValue";
    stackViewModel.set("testProperty", expectedValue);

    var testFunc = function (views: Array<viewModule.View>) {
        let testStack = <stackLayoutModule.StackLayout>(views[0]);
        testStack.bindingContext = stackViewModel;
        
        let testLabel = <labelModule.Label>(testStack.getChildAt(0));
        testLabel.bind({ sourceProperty: "$parent.testProperty", targetProperty: "text", expression: "$parent.testProperty"});

        TKUnit.assertEqual(testLabel.text, expectedValue);
        TKUnit.assertTrue(stackViewModel['$parent'] === undefined, "stackViewModel['$parent'] should be removed from parent binding context.");
        TKUnit.assertTrue(testLabel.bindingContext['$parent'] === undefined, "testLabel.bindingContext['$parent'] should be removed from parent binding context.");
    }

    helper.buildUIAndRunTest(createStack(), testFunc);
}

export var test_BindingToParentsView_ShouldNotLeaveGarbageInViewModel = function () {
    var createStack = function () {
        var stack = new stackLayoutModule.StackLayout();
        var label = new labelModule.Label();
        stack.addChild(label);
        return stack;
    }
    var stackViewModel = new observable.Observable();
    var expectedValue = "testValue";
    stackViewModel.set("testProperty", expectedValue);

    var testFunc = function (views: Array<viewModule.View>) {
        let testStack = <stackLayoutModule.StackLayout>(views[0]);
        testStack.bindingContext = stackViewModel;
        
        let testLabel = <labelModule.Label>(testStack.getChildAt(0));
        testLabel.bind({ sourceProperty: "$parents['StackLayout'].testProperty", targetProperty: "text", expression: "$parents['StackLayout'].testProperty"});

        TKUnit.assertEqual(testLabel.text, expectedValue);
        TKUnit.assertTrue(stackViewModel['$parent'] === undefined, "stackViewModel['$parent'] should be removed from parent binding context.");
        TKUnit.assertTrue(testLabel.bindingContext['$parents'] === undefined, "testLabel.bindingContext['$parents'] should be removed from parent binding context.");
    }

    helper.buildUIAndRunTest(createStack(), testFunc);
}

export function test_BindingToDictionaryAtAppLevel() {
    var createLabel = function () {
        var label = new labelModule.Label();
        return label;
    }
    var pageViewModel = new observable.Observable();
    var testPropertyName = "testValue";
    var expectedValue = "expectedValue";
    pageViewModel.set("testProperty", testPropertyName);
    var dict = {};
    dict[testPropertyName] = expectedValue;
    appModule.resources["dict"] = dict;

    var testFunc = function (views: Array<viewModule.View>) {
        var testLabel = <labelModule.Label>(views[0]);
        testLabel.bind({ sourceProperty: "testProperty", targetProperty: "text", expression: "dict[testProperty]" });

        var page = <pageModule.Page>(views[1]);
        page.bindingContext = pageViewModel;

        TKUnit.assertEqual(testLabel.text, expectedValue);
        TKUnit.assertTrue(testLabel.bindingContext["dict"] === undefined, "BindingContext should not contain properties from application resources.");
    }

    helper.buildUIAndRunTest(createLabel(), testFunc);
}

export function test_BindingConverterCalledEvenWithNullValue() {
    var createLabel = function () {
        var label = new labelModule.Label();
        return label;
    }
    var pageViewModel = new observable.Observable();
    var testPropertyValue = null;
    var expectedValue = "collapsed";
    pageViewModel.set("testProperty", testPropertyValue);
    appModule.resources["converter"] = function(value) {
        if (value) {
            return "visible";
        } else {
            return "collapsed";
        }
    };

    var testFunc = function (views: Array<viewModule.View>) {
        var testLabel = <labelModule.Label>(views[0]);
        testLabel.bind({ sourceProperty: "testProperty", targetProperty: "text", expression: "testProperty | converter" });

        var page = <pageModule.Page>(views[1]);
        page.bindingContext = pageViewModel;

        TKUnit.assertEqual(testLabel.text, expectedValue);
    }

    helper.buildUIAndRunTest(createLabel(), testFunc);
}

export function test_UpdatingNestedPropertyViaBinding() {
    var expectedValue1 = "Alabala";
    var expectedValue2 = "Tralala";
    var viewModel = new observable.Observable();
    var parentViewModel = new observable.Observable();
    viewModel.set("parentView", parentViewModel);
    parentViewModel.set("name", expectedValue1);

    var testElement: bindable.Bindable = new bindable.Bindable();

    testElement.bind({
        sourceProperty: "parentView.name",
        targetProperty: "targetName",
        twoWay: true
    }, viewModel);

    var testElement2: bindable.Bindable = new bindable.Bindable();

    testElement2.bind({
        sourceProperty: "parentView.name",
        targetProperty: "targetProperty",
        twoWay: true
    }, viewModel);

    TKUnit.assertEqual(testElement.get("targetName"), expectedValue1);

    testElement.set("targetName", expectedValue2);

    TKUnit.assertEqual(parentViewModel.get("name"), expectedValue2);
    TKUnit.assertEqual(testElement2.get("targetProperty"), expectedValue2);
}

class Person extends observable.Observable {
    private _firstName: string;
    private _lastName: string;

    public get FirstName(): string {
        return this._firstName;
    }

    public set FirstName(value: string) {
        if (this._firstName !== value) {
            this._firstName = value;
            this.notifyPropertyChange("FirstName", value);
        }
    }

    public get LastName(): string {
        return this._lastName;
    }

    public set LastName(value: string) {
        if (this._lastName !== value) {
            this._lastName = value;
            this.notifyPropertyChange("LastName", value);
        }
    }
}

class Activity extends observable.Observable {
    private _text: string;
    private _owner: Person;

    public get Text(): string {
        return this._text;
    }

    public set Text(value: string) {
        if (this._text !== value) {
            this._text = value;
            this.notifyPropertyChange("Text", value);
        }
    }

    public get Owner(): Person {
        return this._owner;
    }

    public set Owner(value: Person) {
        if (this._owner !== value) {
            this._owner = value;
            this.notifyPropertyChange("Owner", value);
        }
    }

    constructor(text: string, firstName: string, lastName: string) {
        super();
        this._text = text;
        var owner = new Person();
        owner.FirstName = firstName;
        owner.LastName = lastName;
        this.Owner = owner;
    }
}

export function test_NestedPropertiesBinding() {
    var expectedValue = "Default Text";
    var viewModel = new observable.Observable();
    viewModel.set("activity", new Activity(expectedValue, "Default First Name", "Default Last Name"));

    var target1 = new bindable.Bindable();
    target1.bind({
        sourceProperty: "activity.Text",
        targetProperty: "targetProperty",
        twoWay: true
    }, viewModel);

    TKUnit.assertEqual(target1.get("targetProperty"), expectedValue);

    var newExpectedValue = "Alabala";
    var act = new Activity(newExpectedValue, "Default First Name", "Default Last Name");

    viewModel.set("activity", act);

    TKUnit.assertEqual(target1.get("targetProperty"), newExpectedValue);
}

export function test_WrongNestedPropertiesBinding() {
    var expectedValue = "Default Text";
    var viewModel = new observable.Observable();
    viewModel.set("activity", new Activity(expectedValue, "Default First Name", "Default Last Name"));
    let errorMessage;
    let traceWriter = {
        write: function (message, category, type?) {
            errorMessage = message;
        }
    }
    trace.addWriter(traceWriter);

    var target1 = new bindable.Bindable();
    target1.bind({
        sourceProperty: "activity.",
        targetProperty: "targetProperty",
        twoWay: true
    }, viewModel);

    TKUnit.assertNotEqual(errorMessage, undefined);
    trace.removeWriter(traceWriter);
}

export function test_NestedPropertiesBindingTwoTargets() {
    var expectedText = "Default Text";
    var expectedFirstName = "Default First Name";
    var expectedLastName = "Default Last Name";
    var viewModel = new observable.Observable();
    viewModel.set("activity", new Activity(expectedText, expectedFirstName, expectedLastName));

    var target1 = new bindable.Bindable();
    target1.bind({
        sourceProperty: "activity.Text",
        targetProperty: "targetProperty",
        twoWay: true
    }, viewModel);

    var target2 = new bindable.Bindable();
    target2.bind({
        sourceProperty: "activity.Owner.FirstName",
        targetProperty: "targetProp",
        twoWay: true
    }, viewModel);

    TKUnit.assertEqual(target1.get("targetProperty"), expectedText);
    TKUnit.assertEqual(target2.get("targetProp"), expectedFirstName);

    var newExpectedText = "Alabala";
    var newExpectedFirstName = "First Tralala";
    var newExpectedLastName = "Last Tralala";
    var act = new Activity(newExpectedText, newExpectedFirstName, newExpectedLastName);

    viewModel.set("activity", act);

    TKUnit.assertEqual(target1.get("targetProperty"), newExpectedText);
    TKUnit.assertEqual(target2.get("targetProp"), newExpectedFirstName);
}

export function test_NestedPropertiesBindingTwoTargetsAndSecondChange() {
    var expectedText = "Default Text";
    var expectedFirstName = "Default First Name";
    var expectedLastName = "Default Last Name";
    var viewModel = new observable.Observable();
    viewModel.set("activity", new Activity(expectedText, expectedFirstName, expectedLastName));

    var target1 = new bindable.Bindable();
    target1.bind({
        sourceProperty: "activity.Text",
        targetProperty: "targetProperty",
        twoWay: true
    }, viewModel);

    var target2 = new bindable.Bindable();
    target2.bind({
        sourceProperty: "activity.Owner.FirstName",
        targetProperty: "targetProp",
        twoWay: true
    }, viewModel);

    TKUnit.assertEqual(target1.get("targetProperty"), expectedText);
    TKUnit.assertEqual(target2.get("targetProp"), expectedFirstName);

    var newExpectedText = "Alabala";
    var newExpectedFirstName = "First Tralala";
    var newExpectedLastName = "Last Tralala";
    var act = new Activity(newExpectedText, newExpectedFirstName, newExpectedLastName);

    viewModel.set("activity", act);

    TKUnit.assertEqual(target1.get("targetProperty"), newExpectedText);
    TKUnit.assertEqual(target2.get("targetProp"), newExpectedFirstName);

    var secondExpectedText = "Second expected text";
    var secondExpectedFirstName = "Second expected first name";
    var secondExpectedLastName = "Second expected last name";
    var act1 = new Activity(secondExpectedText, secondExpectedFirstName, secondExpectedLastName);

    viewModel.set("activity", act1);

    TKUnit.assertEqual(target1.get("targetProperty"), secondExpectedText);
    TKUnit.assertEqual(target2.get("targetProp"), secondExpectedFirstName);
}

export function test_NestedPropertiesBindingTwoTargetsAndRegularChange() {
    var expectedText = "Default Text";
    var expectedFirstName = "Default First Name";
    var expectedLastName = "Default Last Name";
    var viewModel = new observable.Observable();
    viewModel.set("activity", new Activity(expectedText, expectedFirstName, expectedLastName));

    var target1 = new bindable.Bindable();
    target1.bind({
        sourceProperty: "activity.Text",
        targetProperty: "targetProperty",
        twoWay: true
    }, viewModel);

    var target2 = new bindable.Bindable();
    target2.bind({
        sourceProperty: "activity.Owner.FirstName",
        targetProperty: "targetProp",
        twoWay: true
    }, viewModel);

    TKUnit.assertEqual(target1.get("targetProperty"), expectedText);
    TKUnit.assertEqual(target2.get("targetProp"), expectedFirstName);

    var newExpectedText = "Alabala";
    var newExpectedFirstName = "First Tralala";
    var newExpectedLastName = "Last Tralala";
    var act = new Activity(newExpectedText, newExpectedFirstName, newExpectedLastName);

    viewModel.set("activity", act);

    TKUnit.assertEqual(target1.get("targetProperty"), newExpectedText);
    TKUnit.assertEqual(target2.get("targetProp"), newExpectedFirstName);

    var newAct = viewModel.get("activity");
    var secondExpectedText = "Second expected text";
    newAct.Text = secondExpectedText;
    var secondExpectedFirstName = "Second expected First Name";
    newAct.Owner.FirstName = secondExpectedFirstName;

    TKUnit.assertEqual(target1.get("targetProperty"), secondExpectedText);
    TKUnit.assertEqual(target2.get("targetProp"), secondExpectedFirstName);
}

export function test_NestedPropertiesBindingTwoTargetsAndReplacingSomeNestedObject() {
    var expectedText = "Default Text";
    var expectedFirstName = "Default First Name";
    var expectedLastName = "Default Last Name";
    var viewModel = new observable.Observable();
    viewModel.set("activity", new Activity(expectedText, expectedFirstName, expectedLastName));

    var target1 = new bindable.Bindable();
    target1.bind({
        sourceProperty: "activity.Text",
        targetProperty: "targetProperty",
        twoWay: true
    }, viewModel);

    var target2 = new bindable.Bindable();
    target2.bind({
        sourceProperty: "activity.Owner.FirstName",
        targetProperty: "targetProp",
        twoWay: true
    }, viewModel);

    TKUnit.assertEqual(target1.get("targetProperty"), expectedText);
    TKUnit.assertEqual(target2.get("targetProp"), expectedFirstName);

    var newExpectedText = "Alabala";
    var newExpectedFirstName = "First Tralala";
    var newExpectedLastName = "Last Tralala";
    var act = new Activity(newExpectedText, newExpectedFirstName, newExpectedLastName);

    viewModel.set("activity", act);

    TKUnit.assertEqual(target1.get("targetProperty"), newExpectedText);
    TKUnit.assertEqual(target2.get("targetProp"), newExpectedFirstName);

    var secondExpectedFirstName = "Second expected first name";
    var newPerson = new Person();
    newPerson.FirstName = secondExpectedFirstName;
    newPerson.LastName = "Last Name";

    var act1 = viewModel.get("activity");
    (<Activity>act1).Owner = newPerson;

    TKUnit.assertEqual(target2.get("targetProp"), secondExpectedFirstName);
}

export function test_NullSourcePropertyShouldNotCrash() {
    var expectedValue = "Expected Value";
    var target = new bindable.Bindable();
    var convFunc = function (value) {
        return value + "Converted";
    }
    var model = new observable.Observable();
    model.set("field", expectedValue);
    model.set("convFunc", convFunc);
    target.bind({
        sourceProperty: null,
        targetProperty: "targetProp",
        expression: "convFunc(field)"
    }, model);

    TKUnit.assertEqual(target.get("targetProp"), convFunc(expectedValue));
}

export function test_BindingContextOfAChildElementIsNotOverwrittenBySettingTheBindingContextOfPage() {
    var testFinished = false;

    let page = helper.getCurrentPage();
    let child = new stackLayoutModule.StackLayout();
    let childModel = new observable.Observable();
    child.bindingContext = childModel;
    TKUnit.assertEqual(child.bindingContext, childModel);

    child.on(stackLayoutModule.StackLayout.loadedEvent, (args) => {
        TKUnit.assertEqual(child.bindingContext, childModel);
        page.bindingContext = new observable.Observable();
        TKUnit.assertEqual(child.bindingContext, childModel);
        child.off(stackLayoutModule.StackLayout.loadedEvent);
        testFinished = true;
    });

    page.content = child;
    TKUnit.waitUntilReady(() => testFinished);
}

export var test_BindingHitsGetterTooManyTimes = function () {
    var counter = 0;

    class Dummy extends observable.Observable {
        private _dummyProperty: string;

        public get dummyProperty(): string {
            counter++;
            return this._dummyProperty;
        }

        public set dummyProperty(value: string) {
            if (this._dummyProperty !== value) {
                this._dummyProperty = value;
                this.notifyPropertyChange("dummyProperty", value);
            }
        }
    }

    var model = new Dummy();
    model.dummyProperty = "OPA";

    var bindableObj = new bindable.Bindable();

    bindableObj.bind({ sourceProperty: "dummyProperty", targetProperty: "dummyTarget" }, model);

    TKUnit.assertEqual(counter, 1, "Property getter should be hit only once!");
}

export function test_SupportFunctionsInExpressions() {
    var model = new observable.Observable({
        "anyColor": "red",
        "isVisible": function () {
            return this.get("anyColor") === "red";
        }
    });

    var bindableObj = new bindable.Bindable();

    bindableObj.bind({
        "sourceProperty": "$value",
        "targetProperty": "test",
        "expression": "isVisible() ? 'visible' : 'collapsed'"
    }, model);

    model.set("anyColor", "blue");

    TKUnit.assertEqual(bindableObj.get("test"), "collapsed", "When anyColor is blue test property should be collapsed.");

    model.set("anyColor", "red");

    TKUnit.assertEqual(bindableObj.get("test"), "visible", "When anyColor is red test property should be visible.");
}

export function test_$ValueSupportWithinExpression() {
    var model = new observable.Observable({
        "anyColor": "red",
        "isVisible": function () {
            return this.get("anyColor") === "red";
        }
    });

    var bindableObj = new bindable.Bindable();

    bindableObj.bind({
        "sourceProperty": "$value",
        "targetProperty": "test",
        "expression": "$value.anyColor === 'red' ? 'red' : 'blue'"
    }, model);

    model.set("anyColor", "blue");

    TKUnit.assertEqual(bindableObj.get("test"), "blue", "When anyColor is blue test property should be blue too.");

    model.set("anyColor", "red");

    TKUnit.assertEqual(bindableObj.get("test"), "red", "When anyColor is red test property should be red too.");
    TKUnit.assertTrue(model['$value'] === undefined, "We should not add $value to binding context.");
}

class DummyNestedClass extends observable.Observable {
    private _secondsobject: number;
    public get secondsobject(): number {
        return this._secondsobject;
    }
    public set secondsobject(value: number) {
        if (this._secondsobject !== value) {
            this._secondsobject = value;
            this.notifyPropertyChange('secondsobject', value);
        }
    }
}

class DummyClassWithSamePropertyNames extends observable.Observable {
    private _seconds: number;
    private _secondsobject: DummyNestedClass;
    public get seconds(): number {
        return this._seconds;
    }
    public set seconds(value: number) {
        if (this._seconds !== value) {
            this._seconds = value;
            this.notifyPropertyChange('seconds', value);
        }
    }
    
    public get secondsobject(): DummyNestedClass {
        return this._secondsobject;
    }
    public set secondsobject(value: DummyNestedClass) {
        if (this._secondsobject !== value) {
            this._secondsobject = value;
            this.notifyPropertyChange('secondsobject', value);
        }
    }
}

class DummyModel extends observable.Observable {
    private _item: DummyClassWithSamePropertyNames;
    public get item(): DummyClassWithSamePropertyNames {
        return this._item;
    }
    
    public set item(value: DummyClassWithSamePropertyNames) {
        if (this._item !== value) {
            this._item = value;
            this.notifyPropertyChange("item", value);
        }
    }
}

export function test_BindingToPropertiesWithSameNames() {
    var model = new DummyModel();
    model.item = new DummyClassWithSamePropertyNames();
    model.item.seconds = 1;
    var secondsobject = new DummyNestedClass();
    secondsobject.secondsobject = 1;
    model.item.secondsobject = secondsobject;
    
    var target1 = new bindable.Bindable();
    target1.bind({
        sourceProperty: "item.seconds",
        targetProperty: "targetProperty",
        twoWay: true
    }, model);

    var target2 = new bindable.Bindable();
    target2.bind({
        sourceProperty: "item.secondsobject.secondsobject",
        targetProperty: "targetProp",
        twoWay: true
    }, model);
    
    model.item.set("seconds", model.item.seconds + 1);
    var newValue = (<any>model).item.secondsobject.secondsobject + 1;
    model.item.secondsobject.set("secondsobject", newValue);
    
    TKUnit.assertEqual(target1.get("targetProperty"), model.item.get("seconds"));
    TKUnit.assertEqual(target2.get("targetProp"), newValue);
    
    // calling this two times in order to ensure that adding and removing weak event listeners is working fine.
    newValue = model.item.secondsobject.secondsobject + 1;
    model.item.secondsobject.set("secondsobject", newValue);
    
    TKUnit.assertEqual(target1.get("targetProperty"), model.item.get("seconds"));
    TKUnit.assertEqual(target2.get("targetProp"), newValue);
}

export function test_BindingToPropertiesWithSameNamesSecondCase() {
    var model = new DummyModel();
    model.item = new DummyClassWithSamePropertyNames();
    model.item.seconds = 1;
    var secondsobject = new DummyNestedClass();
    secondsobject.secondsobject = 1;
    model.item.secondsobject = secondsobject;
    
    var target1 = new bindable.Bindable();
    target1.bind({
        sourceProperty: "item.seconds",
        targetProperty: "targetProperty",
        twoWay: true
    }, model);

    var target2 = new bindable.Bindable();
    target2.bind({
        sourceProperty: "item.secondsobject.secondsobject",
        targetProperty: "targetProp",
        twoWay: true
    }, model);
    
    model.item.set("seconds", model.item.seconds + 1);
    var newValue = model.item.secondsobject.secondsobject + 1;
    model.item.set("secondsobject",{secondsobject: newValue});
    
    TKUnit.assertEqual(target1.get("targetProperty"), model.item.get("seconds"));
    TKUnit.assertEqual(target2.get("targetProp"), newValue);
    
    // calling this two times in order to ensure that adding and removing weak event listeners is working fine.
    newValue = model.item.secondsobject.secondsobject + 1;
    model.item.set("secondsobject",{secondsobject: newValue});
    
    TKUnit.assertEqual(target1.get("targetProperty"), model.item.get("seconds"));
    TKUnit.assertEqual(target2.get("targetProp"), newValue);
}

class RelatedPropsClass extends observable.Observable {
    private _prop1: boolean;
    private _prop2: string;
    public get prop1(): boolean {
        return this._prop1;
    }
    public set prop1(value: boolean) {
        if (this._prop1 !== value) {
            this._prop1 = value;
            this.notifyPropertyChange("prop1", value);
        }
    }
    
    public get prop2(): string {
        this.prop1 = !this._prop1;
        this.notifyPropertyChange("prop2", this._prop2);
        return this._prop2;
    }
    
    public set prop2(value: string) {
        if (this._prop2 !== value) {
            this._prop2 = value;
            this.notifyPropertyChange("prop2", value);
        }
    }
}

export function test_BindingToRelatedProps() {
    let model = new RelatedPropsClass();
    model.prop1 = false;
    model.prop2 = "Alabala";
    
    let target1 = new bindable.Bindable();
    target1.bind({sourceProperty: 'prop1', targetProperty: 'targetProp1'}, model);
    
    let target2 = new bindable.Bindable();
    target2.bind({sourceProperty: 'prop2', targetProperty: 'targetProp2'}, model);
    
    model.prop2 = "Tralala";
    
    TKUnit.assertEqual(target2.get('targetProp2'), "Tralala");
}

export function test_only_Bindable_BindingContext_Null_DoesNotThrow() {
        var options: bindable.BindingOptions = {
            sourceProperty: "a.b",
            targetProperty: "test"
        }
        var obj = new bindable.Bindable();
        obj.bind(options);
        obj.bindingContext = new observable.Observable({ a: "b" });
        obj.bindingContext = null;
}

export function test_Observable_from_nested_json_binds_correctly() {
    let expectedValue = "Test";
    let model = observable.fromObjectRecursive({
        "firstObject": {
            "secondObject": {
                "dummyProperty": "text"
            }
        }
    });

    var obj = new bindable.Bindable();
    obj.bind({
        sourceProperty: "firstObject.secondObject.dummyProperty",
        targetProperty: "test"
    }, model);

    model.get("firstObject").get("secondObject").set("dummyProperty", expectedValue);

    TKUnit.assertEqual(obj.get("test"), expectedValue);
}

export function test_Observable_from_nested_json_binds_correctly_when_upper_object_is_changed() {
    let expectedValue = "Test";
    let model = observable.fromObjectRecursive({
        "firstObject": {
            "secondObject": {
                "dummyProperty": "text"
            }
        }
    });

    var obj = new bindable.Bindable();
    obj.bind({
        sourceProperty: "firstObject.secondObject.dummyProperty",
        targetProperty: "test"
    }, model);

    model.get("firstObject").set("secondObject", new observable.Observable({"dummyProperty": expectedValue}));

    TKUnit.assertEqual(obj.get("test"), expectedValue);
}

export function test_BindingToBindingContextProperty_ShouldUseNewContext() {
    let stackLayout = new stackLayoutModule.StackLayout();
    let label = new labelModule.Label();
    stackLayout.addChild(label);

    label.bind({
        sourceProperty: 'context',
        targetProperty: 'bindingContext'
    });

    label.bind({
        sourceProperty: 'text',
        targetProperty: 'text'
    });

    let testBindingContext = observable.fromObjectRecursive({
        context: {
            text: 'Alabala'
        }
    });

    stackLayout.bindingContext = testBindingContext;

    (<any>testBindingContext).context.text = "Tralala";

    TKUnit.assertEqual(label.text, "Tralala");
}