/*
Copyright 2024 New Vector Ltd.
Copyright 2024 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

import os from "node:os";
import path from "node:path";
import * as fsp from "node:fs/promises";
import * as fs from "node:fs";
import JSZip from "jszip";

import { test, expect } from "../../element-web-test";

// Based on https://github.com/Stuk/jszip/issues/466#issuecomment-2097061912
async function extractZipFileToPath(file: string, outputPath: string): Promise<JSZip> {
    if (!fs.existsSync(outputPath)) {
        fs.mkdirSync(outputPath, { recursive: true });
    }

    const data = await fsp.readFile(file);
    const zip = await JSZip.loadAsync(data, { createFolders: true });

    await new Promise<void>((resolve, reject) => {
        let entryCount = 0;
        let errorOut = false;

        zip.forEach(() => {
            entryCount++;
        }); // there is no other way to count the number of entries within the zip file.

        zip.forEach((relativePath, zipEntry) => {
            if (errorOut) {
                return;
            }

            const outputEntryPath = path.join(outputPath, relativePath);
            if (zipEntry.dir) {
                if (!fs.existsSync(outputEntryPath)) {
                    fs.mkdirSync(outputEntryPath, { recursive: true });
                }

                entryCount--;

                if (entryCount === 0) {
                    resolve();
                }
            } else {
                void zipEntry
                    .async("blob")
                    .then(async (content) => Buffer.from(await content.arrayBuffer()))
                    .then((buffer) => {
                        const stream = fs.createWriteStream(outputEntryPath);
                        stream.write(buffer, (error) => {
                            if (error) {
                                reject(error);
                                errorOut = true;
                            }
                        });
                        stream.on("finish", () => {
                            entryCount--;

                            if (entryCount === 0) {
                                resolve();
                            }
                        });
                        stream.end(); // extremely important on Windows. On Mac / Linux, not so much since those platforms allow multiple apps to read from the same file. Windows doesn't allow that.
                    })
                    .catch((e) => {
                        errorOut = true;
                        reject(e);
                    });
            }
        });
    });

    return zip;
}

test.describe("HTML Export", () => {
    test.use({
        displayName: "Alice",
        room: async ({ app, user }, use) => {
            const roomId = await app.client.createRoom({ name: "Important Room" });
            await app.viewRoomByName("Important Room");
            await use({ roomId });
        },
    });

    test("should export html successfully and match screenshot", async ({ page, app, room }) => {
        // Set a fixed time rather than masking off the line with the time in it: we don't need to worry
        // about the width changing and we can actually test this line looks correct.
        page.clock.setSystemTime(new Date("2024-01-01T00:00:00Z"));

        // Send a bunch of messages to populate the room
        for (let i = 1; i < 10; i++) {
            await app.client.sendMessage(room.roomId, { body: `Testing ${i}`, msgtype: "m.text" });
        }

        // Wait for all the messages to be displayed
        await expect(
            page.locator(".mx_EventTile_last .mx_MTextBody .mx_EventTile_body").getByText("Testing 9"),
        ).toBeVisible();

        await app.toggleRoomInfoPanel();
        await page.getByRole("menuitem", { name: "Export Chat" }).click();

        const downloadPromise = page.waitForEvent("download");
        await page.getByRole("button", { name: "Export", exact: true }).click();
        const download = await downloadPromise;

        const dirPath = path.join(os.tmpdir(), "html-export-test");
        const zipPath = `${dirPath}.zip`;
        await download.saveAs(zipPath);

        const zip = await extractZipFileToPath(zipPath, dirPath);
        await page.goto(`file://${dirPath}/${Object.keys(zip.files)[0]}/messages.html`);
        await expect(page).toMatchScreenshot("html-export.png", {
            mask: [
                // We need to mask the whole thing because the width of the time part changes
                page.locator(".mx_TimelineSeparator"),
                page.locator(".mx_MessageTimestamp"),
            ],
        });
    });
});