import * as TKUnit from "../../tk-unit";
import { _resetRootView } from "tns-core-modules/application/";
import { Frame, NavigationEntry, topmost } from "tns-core-modules/ui/frame";
import { Page } from "tns-core-modules/ui/page";
import { Tabs, TabContentItem, TabStrip, TabStripItem } from "tns-core-modules/ui/tabs";

function waitUntilNavigatedToMaxTimeout(pages: Page[], action: Function) {
    const maxTimeout = 8;
    let completed = 0;
    function navigatedTo(args) {
        args.object.page.off("navigatedTo", navigatedTo);
        completed++;
    }

    pages.forEach(page => page.on("navigatedTo", navigatedTo));
    action();
    TKUnit.waitUntilReady(() => completed === pages.length, maxTimeout);
}

function createPage(i: number) {
    const page = new Page();
    page.id = `Tab${i} Frame${i} Page${i}`;

    return page;
}

function createFrame(i: number, page: Page) {
    const frame = new Frame();
    frame.navigate(() => page);
    frame.id = `Tab${i} Frame${i}`;

    return frame;
}

function createTabItem(i: number, frame: Frame) {
    const tabEntry = new TabContentItem();
    // tabEntry.title = "Tab " + i;
    tabEntry.content = frame;
    tabEntry["index"] = i;

    return tabEntry;
}

function createTabItemsWithFrames(count: number) {
    const items = [];

    for (var i = 0; i < count; i++) {
        const page = createPage(i);
        const frame = createFrame(i, page);
        const tabItem = createTabItem(i, frame);

        items.push({ page, frame, tabItem });
    }

    return items;
}

function createTabStrip(count: number): TabStrip {
    const items = new Array<TabStripItem>();
    for (let i = 0; i < count; i++) {
        let tabStripEntry = new TabStripItem();
        tabStripEntry.title = "Tab " + i;
        items.push(tabStripEntry);
    }

    const tabStrip = new TabStrip();
    tabStrip.items = items;

    return tabStrip;
}

export function test_frame_topmost_matches_selectedIndex() {
    const items = createTabItemsWithFrames(3);
    const tabView = new Tabs();
    tabView.items = items.map(item => item.tabItem);
    tabView.tabStrip = createTabStrip(3);

    // iOS cannot preload tab items
    // Android preloads 1 tab item to the sides by default
    // set this to 0, so that both platforms behave the same.
    // tabView.androidOffscreenTabLimit = 0;

    const entry: NavigationEntry = {
        create: () => tabView
    };

    waitUntilNavigatedToMaxTimeout([items[0].page], () => _resetRootView(entry));
    TKUnit.assertEqual(topmost().id, "Tab0 Frame0");

    waitUntilNavigatedToMaxTimeout([items[1].page], () => tabView.selectedIndex = 1);
    TKUnit.assertEqual(topmost().id, "Tab1 Frame1");
}

// TODO: _resetRootView doesn't work with TabView or Tabs with pre-loading. The fragments that are removed crash the app with missing reference.
// export function test_preloading_one_to_the_side_on_index_change() {
//     let actualEventsRaised = [];

//     function resetActualEventsRaised() {
//         for (var i = 0; i < actualEventsRaised.length; i++) {
//             actualEventsRaised[i] = [];
//         }
//     }

//     function attachEventHandlers(i: number, item) {
//         actualEventsRaised.push([]);

//         const page = item.page;
//         page.on(Page.loadedEvent, () => actualEventsRaised[i].push(`${page.id} loaded`));
//         page.on(Page.unloadedEvent, () => actualEventsRaised[i].push(`${page.id} unloaded`));
//         page.on(Page.navigatingToEvent, () => actualEventsRaised[i].push(`${page.id} navigatingTo`));
//         page.on(Page.navigatingFromEvent, () => actualEventsRaised[i].push(`${page.id} navigatingFrom`));
//         page.on(Page.navigatedToEvent, () => actualEventsRaised[i].push(`${page.id} navigatedTo`));
//         page.on(Page.navigatedFromEvent, () => actualEventsRaised[i].push(`${page.id} navigatedFrom`));

//         const frame = item.frame;
//         frame.on(Frame.loadedEvent, () => actualEventsRaised[i].push(`${frame.id} loaded`));
//         frame.on(Frame.unloadedEvent, () => actualEventsRaised[i].push(`${frame.id} unloaded`));
//     }

//     const items = createTabItemsWithFrames(3);

//     items.forEach((item, i) => {
//         attachEventHandlers(i, item);
//     });

//     const tabView = new Tabs();
//     tabView.items = items.map(item => item.tabItem);
//     tabView.tabStrip = createTabStrip(3);

//     const entry: NavigationEntry = {
//         create: () => tabView
//     };

//     waitUntilNavigatedToMaxTimeout([items[0].page], () => _resetRootView(entry));

//     const expectedEventsRaisedAfterTabCreated = [
//         [
//             "Tab0 Frame0 loaded",
//             "Tab0 Frame0 Page0 navigatingTo",
//             "Tab0 Frame0 Page0 loaded",
//             "Tab0 Frame0 Page0 navigatedTo",
//         ],
//         [],
//         []
//     ];

//     TKUnit.assertDeepEqual(actualEventsRaised, expectedEventsRaisedAfterTabCreated);

//     resetActualEventsRaised();
//     waitUntilNavigatedToMaxTimeout([items[2].page], () => tabView.selectedIndex = 2);

//     const expectedEventsRaisedAfterSelectThirdTab = [
//         [
//             "Tab0 Frame0 Page0 unloaded",
//             "Tab0 Frame0 unloaded",
//         ],
//         [],
//         [
//             "Tab2 Frame2 loaded",
//             "Tab2 Frame2 Page2 navigatingTo",
//             "Tab2 Frame2 Page2 loaded",
//             "Tab2 Frame2 Page2 navigatedTo"
//         ]
//     ];

//     TKUnit.assertDeepEqual(actualEventsRaised, expectedEventsRaisedAfterSelectThirdTab);

//     resetActualEventsRaised();

//     waitUntilTabViewReady(items[0].page, () => tabView.selectedIndex = 0);

//     const expectedEventsRaisedAfterReturnToFirstTab = [
//         [
//             "Tab0 Frame0 Page0 loaded",
//             "Tab0 Frame0 loaded",
//         ],
//         [],
//         [
//             "Tab2 Frame2 Page2 unloaded",
//             "Tab2 Frame2 unloaded",
//         ]
//     ];

//     TKUnit.assertDeepEqual(actualEventsRaised, expectedEventsRaisedAfterReturnToFirstTab);
// }

export function tearDownModule() {
    const page = new Page();
    const frame = new Frame();
    frame.navigate(() => page);

    const entry: NavigationEntry = {
        create: () => frame
    };

    waitUntilNavigatedToMaxTimeout([page], () => _resetRootView(entry));
}