import { Image } from "@nativescript/core/ui/image";
import { StackLayout } from "@nativescript/core/ui/layouts/stack-layout";
import { GridLayout } from "@nativescript/core/ui/layouts/grid-layout";
import { isIOS, isAndroid } from "@nativescript/core/platform";
import { PropertyChangeData } from "@nativescript/core/data/observable";
import * as utils from "@nativescript/core/utils/utils";
import * as TKUnit from "../../tk-unit";
import { getColor } from "../../ui-helper";

// >> img-require
import * as ImageModule from "@nativescript/core/ui/image";
// << img-require

import * as types from "@nativescript/core/utils/types";
import { ImageSource } from "@nativescript/core/image-source";
import * as ViewModule from "@nativescript/core/ui/core/view";
import * as helper from "../../ui-helper";
import * as ObservableModule from "@nativescript/core/data/observable";
import * as color from "@nativescript/core/color";
import * as backgroundModule from "@nativescript/core/ui/styling/background";
import { android as androidApp } from "@nativescript/core/application";
const imagePath = "~/assets/logo.png";

export function test_recycling() {
    helper.nativeView_recycling_test(() => new Image());
}

if (isAndroid) {
    (<any>backgroundModule).initImageCache(androidApp.startActivity, (<any>backgroundModule).CacheMode.memory); // use memory cache only.
}

export const test_Image_Members = function () {
    const image = new ImageModule.Image();
    TKUnit.assert(types.isUndefined(image.src), "Image.src is defined");
    TKUnit.assert(types.isDefined(image.isLoading), "Image.isLoading is not defined");
    TKUnit.assert(image.isLoading === false, "Image.isLoading is default value should be false.");
};

export const test_setting_src_to_resource = function () {
    // >> img-create
    const image = new ImageModule.Image();
    image.src = "res://icon";
    // << img-create

    const testFunc = function (views: Array<ViewModule.View>) {
        TKUnit.waitUntilReady(() => image.isLayoutValid);
        const width = image.getMeasuredWidth();
        const height = image.getMeasuredHeight();

        TKUnit.assert(width > 0, "Width should be greater than 0.");
        TKUnit.assert(height > 0, "Height should be greater than 0.");
    };

    helper.buildUIAndRunTest(image, testFunc);
};

const IMAGE_LOADED_EVENT = "isLoadingChange";

function runImageTestSync(image: ImageModule.Image, src: string) {
    image.loadMode = "sync";
    image.src = null;

    const page = helper.getCurrentPage();
    page.content = image;

    image.src = src;

    let imageSourceAvailable = isIOS ? !!image.imageSource : true;
    TKUnit.assertFalse(image.isLoading, "Image.isLoading should be false.");
    TKUnit.assertTrue(imageSourceAvailable, "imageSource should be set.");
}

function runImageTestAsync(image: ImageModule.Image, src: string, done: (e: any) => void) {
    image.loadMode = "async";
    image.src = null;

    let handler = function (data: ObservableModule.PropertyChangeData) {
        image.off(IMAGE_LOADED_EVENT, handler);

        try {
            let imageSourceAvailable = isIOS ? !!image.imageSource : true;
            TKUnit.assertFalse(image.isLoading, "Image.isLoading should be false.");
            TKUnit.assertTrue(imageSourceAvailable, "imageSource should be set.");
            done(null);
        }
        catch (e) {
            done(e);
        }
    };

    let page = helper.getCurrentPage();
    page.content = image;
    image.src = src;
    image.on(IMAGE_LOADED_EVENT, handler);
    TKUnit.assertTrue(image.isLoading, "Image.isLoading should be true.");
}

export const test_SettingImageSrcToURL_async = function (done) {
    // >> img-create-src
    const image = new ImageModule.Image();
    image.src = "https://www.google.com/images/errors/logo_sm_2.png";
    // << img-create-src
    (<any>image).useCache = false;
    runImageTestAsync(image, image.src, done);
};

export const test_SettingImageSrcToFileWithinApp_sync = function () {
    // >> img-create-local
    const image = new ImageModule.Image();
    image.src = "~/assets/logo.png";
    // << img-create-local

    runImageTestSync(image, image.src);
};

export const test_SettingImageSrcToFileWithinApp_async = function (done) {
    const image = new ImageModule.Image();
    (<any>image).useCache = false;
    image.src = "~/assets/logo.png";
    runImageTestAsync(image, image.src, done);
};

export const test_SettingImageSrcToDataURI_sync = function () {
    // >> img-create-datauri
    const image = new ImageModule.Image();
    image.src = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAAXNSR0IArs4c6QAAABxpRE9UAAAAAgAAAAAAAAACAAAAKAAAAAIAAAACAAAARiS4uJEAAAASSURBVBgZYvjPwABHSMz/DAAAAAD//0GWpK0AAAAOSURBVGNgYPiPhBgQAACEvQv1D5y/pAAAAABJRU5ErkJggg==";
    // << img-create-datauri

    runImageTestSync(image, image.src);
};

export const test_SettingImageSrcToDataURI_async = function (done) {
    const image = new ImageModule.Image();
    image.src = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAAXNSR0IArs4c6QAAABxpRE9UAAAAAgAAAAAAAAACAAAAKAAAAAIAAAACAAAARiS4uJEAAAASSURBVBgZYvjPwABHSMz/DAAAAAD//0GWpK0AAAAOSURBVGNgYPiPhBgQAACEvQv1D5y/pAAAAABJRU5ErkJggg==";

    runImageTestAsync(image, image.src, done);
};

export const test_SettingImageSrcToFontIconCode_sync = function () {
    const image = new ImageModule.Image();
    image.style.fontFamily = "FontAwesome";
    image.src = "font://&#xF10B";

    runImageTestSync(image, image.src);
};

export function test_imageSourceNotResetAfterCreateUI() {
    let image = new ImageModule.Image();
    let imageSource = ImageSource.fromResourceSync("splashscreen");
    TKUnit.assertNotEqual(null, imageSource);
    image.imageSource = imageSource;
    helper.buildUIAndRunTest(image, () => {
        TKUnit.waitUntilReady(() => image.isLoaded);
        TKUnit.assertEqual(image.imageSource, imageSource);
    });
}

// NOTE: This tests that setting multiple times src will not show the imageSource of a previous src value.
// It however will never be reliable as to properly detect failure we need to use somewhat large timeout
// waiting for imageSource to be set to the wrong value.
export const __test_SettingImageSrcTwiceMustNotMismatch = function (done) {
    const image = new Image();
    image.on("propertyChange", (args: PropertyChangeData) => {
        if (args.propertyName === "isLoading" && args.value === false) {
            setTimeout(() => {
                if (image.imageSource) {
                    done(new Error("Images source set from previous async src setting"));
                } else {
                    done();
                }
            }, 50); /* Slow! */
        }
    });
    image.loadMode = "async";
    image.src = "~/assets/logo.png";
    image.src = null;
    // At somepoint image.imageSource was set to "~/assets/logo.png";
};

export const test_SettingStretch_AspectFit = function () {
    // There are 4 modes of stretching none, fill, aspectFill, aspectFit
    // The default value is aspectFit.
    // Image stretch can be set by using ImageModule.stretch enum.
    // >> img-set-stretch
    const image = new ImageModule.Image();
    image.stretch = "aspectFit";
    // << img-set-stretch

    const testFunc = function (views: Array<ViewModule.View>) {
        if (image.android) {
            TKUnit.assertEqual(image.android.getScaleType(), android.widget.ImageView.ScaleType.FIT_CENTER);
        } else if (image.ios) {
            TKUnit.assertEqual(image.ios.contentMode, UIViewContentMode.ScaleAspectFit);
        }
    };

    helper.buildUIAndRunTest(image, testFunc);
};

export const test_SettingStretch_Default = function () {
    const image = new ImageModule.Image();
    const testFunc = function (views: Array<ViewModule.View>) {
        if (image.android) {
            TKUnit.assertEqual(image.android.getScaleType(), android.widget.ImageView.ScaleType.FIT_CENTER);
        } else if (image.ios) {
            TKUnit.assertEqual(image.ios.contentMode, UIViewContentMode.ScaleAspectFit);
        }
    };

    helper.buildUIAndRunTest(image, testFunc);
};

export const test_SettingStretch_AspectFill = function () {
    const image = new ImageModule.Image();
    image.stretch = "aspectFill";

    const testFunc = function (views: Array<ViewModule.View>) {
        if (image.android) {
            TKUnit.assertEqual(image.android.getScaleType(), android.widget.ImageView.ScaleType.CENTER_CROP);
        } else if (image.ios) {
            TKUnit.assertEqual(image.ios.contentMode, UIViewContentMode.ScaleAspectFill);
        }
    };

    helper.buildUIAndRunTest(image, testFunc);
};

export const test_SettingStretch_Fill = function () {
    const image = new ImageModule.Image();
    image.stretch = "fill";

    const testFunc = function (views: Array<ViewModule.View>) {

        if (image.android) {
            TKUnit.assertEqual(image.android.getScaleType(), android.widget.ImageView.ScaleType.FIT_XY);
        } else if (image.ios) {
            TKUnit.assertEqual(image.ios.contentMode, UIViewContentMode.ScaleToFill);
        }
    };

    helper.buildUIAndRunTest(image, testFunc);
};

export const test_SettingStretch_none = function () {
    const image = new ImageModule.Image();
    image.stretch = "none";

    const testFunc = function (views: Array<ViewModule.View>) {
        if (image.android) {
            TKUnit.assertEqual(image.android.getScaleType(), android.widget.ImageView.ScaleType.MATRIX);
        } else if (image.ios) {
            TKUnit.assertEqual(image.ios.contentMode, UIViewContentMode.TopLeft);
        }
    };

    helper.buildUIAndRunTest(image, testFunc);
};

function ios<T>(func: T): T {
    return isIOS ? func : undefined;
}

export const test_SettingImageSourceWhenSizedToParentDoesNotRequestLayout = ios(() => {
    let host = new GridLayout();

    let image = new Image();

    host.width = { value: 300, unit: "dip" };
    host.height = { value: 300, unit: "dip" };
    host.addChild(image);

    let mainPage = helper.getCurrentPage();
    mainPage.content = host;
    TKUnit.waitUntilReady(() => host.isLoaded);

    let called = false;
    image.requestLayout = () => called = true;
    image.src = "~/assets/logo.png";

    TKUnit.assertFalse(called, "image.requestLayout should not be called.");
});

export const test_SettingImageSourceWhenFixedWidthAndHeightDoesNotRequestLayout = ios(() => {
    let host = new StackLayout();
    let image = new Image();
    image.width = { value: 100, unit: "dip" };
    image.height = { value: 100, unit: "dip" };
    host.addChild(image);

    let mainPage = helper.getCurrentPage();
    mainPage.content = host;
    TKUnit.waitUntilReady(() => host.isLoaded);

    let called = false;
    image.requestLayout = () => called = true;
    image.src = "~/assets/logo.png";

    TKUnit.assertFalse(called, "image.requestLayout should not be called.");
});

export const test_SettingImageSourceWhenSizedToContentShouldInvalidate = ios(() => {
    let host = new StackLayout();
    let image = new Image();
    host.addChild(image);

    let mainPage = helper.getCurrentPage();
    mainPage.content = host;
    TKUnit.waitUntilReady(() => host.isLoaded);

    let called = false;
    image.requestLayout = () => called = true;
    image.src = "~/assets/logo.png";

    TKUnit.assertTrue(called, "image.requestLayout should be called.");
});

export const test_DimensionsAreRoundedAfterScale = function () {
    let host = new StackLayout();
    let image = new Image();
    (<any>image).useCache = false;
    image.loadMode = "sync";
    image.src = "~/ui/image/700x50.png";
    let imageWidth = 700;
    let imageHeight = 50;

    let density = utils.layout.getDisplayDensity();
    let hostWidth = 320;
    host.width = { value: hostWidth / density, unit: "dip" };
    host.height = { value: hostWidth / density, unit: "dip" };
    host.addChild(image);
    let mainPage = helper.getCurrentPage();
    mainPage.content = host;
    TKUnit.waitUntilReady(() => host.isLayoutValid);

    let scale = hostWidth / imageWidth;
    let expectedHeight = Math.round(imageHeight * scale);
    TKUnit.assertEqual(image.getMeasuredWidth(), hostWidth, "Actual width is different from expected width.");
    TKUnit.assertEqual(image.getMeasuredHeight(), expectedHeight, "Actual height is different from expected height.");
};

export const test_tintColor = function () {
    const colorRed = new color.Color("red");
    const image = new ImageModule.Image();
    image.src = imagePath;

    const testFunc = function (views: Array<ViewModule.View>) {
        const testImage = <ImageModule.Image>views[0];

        if (image.android) {
            const tintColor = testImage.android.getColorFilter();
            TKUnit.assert(tintColor === null, "tintColor expected to be set to null");
        }
        else if (image.ios) {
            const imageColor = getColor(testImage.ios.tintColor);
            TKUnit.assert(!imageColor.equals(colorRed), "imageColor expected to be different than tintColor");
        }
        image.tintColor = colorRed;

        if (image.android) {
            TKUnit.assert(testImage.android.getColorFilter() !== null, "tintColor expected to be set to a nonnull value");
        }
        else if (image.ios) {
            const imageColor = getColor(testImage.ios.tintColor);
            TKUnit.assert(imageColor.equals(colorRed), "tintColor expected to be set to: " + colorRed);
        }
    };

    helper.buildUIAndRunTest(image, testFunc);
};