// Copyright (C) 2026 Doan Luu Duc Tai <doan@luuduct.ai>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

import assert from 'node:assert/strict';
import type { ServerResponse } from 'node:http';
import { readFile, writeFile, mkdir, mkdtemp, rm } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join, resolve } from 'node:path';
import { chromium, firefox, type BrowserContext, type Page } from 'playwright';
import { asyncServer, libreJSAddon, required, serverOrigin } from '../../../tests/browser-support.js';

const libre = process.env['CHAT_LIBREJS'] === '1';
const profile = await mkdtemp(join(tmpdir(),'stack-chat-progress-'));
const bytes = await readFile(resolve('target/wasm32-wasip1/release/stack-chat-crypto.wasm'));
let mode = 'known';
let transfer: ServerResponse | undefined;
let configuration: ServerResponse | undefined;
let configReady: Promise<void> | undefined;
let signalConfig: (() => void) | undefined;
let origin = '';
const errors: string[] = [];
const server = asyncServer(async (request,response) => {
    response.setHeader('Cache-Control','no-store');
    if (request.url === '/crypto.wasm') {
        if (mode === 'failure') { response.writeHead(503); response.end(); return; }
        response.setHeader('Content-Type','application/wasm');
        if (mode !== 'unknown') response.setHeader('Content-Length',bytes.length);
        transfer = response;
        response.write(bytes.subarray(0,1048576));
        return;
    }
    if (request.url === '/api') { configuration = response; required(signalConfig, 'Missing configuration signal')(); return; }
    const assets: Record<string, string> = { '/':'crates/chat-server/web/index.html','/app.js':'var/build/typescript/crates/chat-server/web/app.js','/style.css':'crates/chat-server/web/style.css' };
    const path = assets[(request.url ?? '')];
    if (path === undefined || path.length === 0) { response.writeHead(404); response.end(); return; }
    const mime = request.url === '/' ? 'text/html' : (request.url?.endsWith('.js') === true) ? 'text/javascript' : 'text/css';
    response.setHeader('Content-Type',mime);
    let source = await readFile(resolve(path),'utf8');
    if (request.url === '/') source = source.replaceAll('{{SITE_ORIGIN}}',origin);
    response.end(source);
});
await new Promise<void>(done => server.listen(0,'127.0.0.1',done));
origin = serverOrigin(server);
let browser;
let context: BrowserContext;
if (libre) {
    await mkdir(join(profile,'extensions'));
    const addon = await readFile(resolve('.tools/librejs.xpi'));
    await writeFile(join(profile,'extensions','jid1-KtlZuoiikVfFew@jetpack.xpi'),addon);
    context = await firefox.launchPersistentContext(profile,{headless:true,firefoxUserPrefs:{'extensions.autoDisableScopes':0,'extensions.enabledScopes':15,'extensions.startupScanScopes':15,'extensions.update.enabled':false}});
    browser = {close:(): Promise<void> => context.close()};
} else {
    browser = await chromium.launch({headless:true,channel:'chromium'});
    context = await browser.newContext();
}
async function open(selected: 'known' | 'unknown' | 'failure'): Promise<Page> {
    mode = selected;
    configuration = undefined;
    configReady = new Promise(done => { signalConfig = done; });
    const page = await context.newPage();
    page.on('pageerror',error => errors.push(error.message));
    await page.clock.install();
    await page.goto(origin);
    return page;
}
async function waitStatus(page: Page, part: string): Promise<string> {
    await page.waitForFunction(value => document.getElementById('status')?.textContent.includes(value),part);
    return (await page.locator('#status').textContent() ?? '');
}
async function complete(page: Page, offset: number): Promise<void> {
    required(transfer, 'Missing transfer').end(bytes.subarray(offset));
    await waitStatus(page,'Connecting to chat');
    await configReady;
    required(configuration, 'Missing configuration').setHeader('Content-Type','application/json');
    required(configuration, 'Missing configuration').end(JSON.stringify({origin,owner:'',protocol:'stack-chat/v1'}));
    await page.locator('#owner-choice').waitFor({state:'visible'});
    assert.equal(await page.locator('#status').textContent(),'');
    assert.equal(await page.evaluate(async () => (await wasm).byteLength),bytes.length);
    await page.close();
}
try {
    const known = await open('known');
    assert.match(await waitStatus(known,'1.0 /'),/\[#{3}-{17}\] 19%/);
    await known.clock.fastForward(44000);
    required(transfer, 'Missing transfer').write(bytes.subarray(1048576,2097152));
    assert.match(await waitStatus(known,'2.0 /'),/39%/);
    await known.screenshot({path:resolve('.tools/chat-download-progress.png'),fullPage:true});
    await known.clock.fastForward(44000);
    assert.ok(!((await known.locator('#status').textContent() ?? '')).includes('stalled'));
    await complete(known,2097152);
    const unknown = await open('unknown');
    assert.equal(await waitStatus(unknown,'1.0 MiB received'),'Downloading cryptographic module... 1.0 MiB received');
    await complete(unknown,1048576);
    const failure = await open('failure');
    await waitStatus(failure,'HTTP 503');
    assert.equal(await failure.locator('#owner-choice').isVisible(),false);
    await failure.close();
    const stalled = await open('known');
    await waitStatus(stalled,'1.0 /');
    await stalled.clock.fastForward(45001);
    await waitStatus(stalled,'stalled for 45 seconds');
    assert.match((await stalled.locator('#status').textContent() ?? ''),/reload/);
    assert.equal(await stalled.locator('#owner-choice').isVisible(),false);
    await stalled.close();
    assert.deepEqual(errors,[]);
    if (libre) {
        assert.ok(libreJSAddon(await readFile(join(profile,'extensions.json'),'utf8')).active);
    }
    console.log(`PASS: ${libre ? 'Firefox/LibreJS' : 'Chromium'} streamed percentage/bar/MiB, unknown length, exact byte recovery, slow continuous transfer, idle timeout, HTTP failure, and connection phase.`);
} finally {
    await browser.close();
    server.closeAllConnections();
    await new Promise(done => server.close(done));
    await rm(profile,{recursive:true,force:true});
}