// src/scrapeDouyin.ts
import { BrowserContext, chromium, Page, type Response } from 'playwright';
import { prisma } from '@/lib/prisma';
import { uploadFile, generateUniqueFileName } from '@/lib/minio';
import { createCamelCompatibleProxy } from '@/app/fetcher/utils';
import { waitForFirstResponse, waitForResponseWithTimeout, safeJson, downloadBinary } from '@/app/fetcher/network';
import { pickBestPlayAddr, extractFirstFrame } from '@/app/fetcher/media';
import { handleImagePost } from '@/app/fetcher/uploader';
import { saveToDB, saveImagePostToDB } from '@/app/fetcher/persist';
import chalk from 'chalk';

const DETAIL_PATH = '/aweme/v1/web/aweme/detail/';
const COMMENT_PATH = '/aweme/v1/web/comment/list/';
const POST_PATH = '/aweme/v1/web/aweme/post/'

async function readPostMem(context: BrowserContext, page: Page) {
    const md = await page.evaluate(() => {
        // @ts-ignore
        let data = window.__pace_captured__.find(i => i[1] && i[1].includes(`"awemeId":`))[1]
        return JSON.parse(data.slice(data.indexOf("{")).replaceAll("]\n", ''))
        // return {aweme: { detail: {} } };
    }).catch(() => null);

    let aweme_mem = md?.aweme?.detail as DouyinImageAweme;
    if (!aweme_mem) throw new Error('页面内存数据中未找到作品详情');

    // @ts-ignore
    aweme_mem.author = aweme_mem.authorInfo
    const comments = md.comment ? createCamelCompatibleProxy<DouyinCommentResponse>(md.comment) : null;
    const aweme = createCamelCompatibleProxy(aweme_mem);

    return { aweme, comments }
}


export async function scrapeDouyin(url: string) {
    const browser = await chromium.launch({ headless: true });
    console.log(chalk.blue('🚀 启动 Chromium 浏览器...'));

    const context = await chromium.launchPersistentContext('chrome-profile/douyin', { headless: false });
    const page = await context.newPage();
    console.log(chalk.cyan(`📄 正在访问: ${chalk.underline(url)}`));

    await page.addInitScript(() => {
        // 建一个全局容器存捕获的数据
        (window as any).__pace_captured__ = [];

        // 用 Proxy 包装一个数组，拦截 push
        const captured = (window as any).__pace_captured__;
        const proxyArr = new Proxy([] as any[], {
            get(target, prop, receiver) {
                if (prop === 'push') {
                    return (...items: any[]) => {
                        try { captured.push(...items); } catch { }
                        return Array.prototype.push.apply(target, items);
                    };
                }
                return Reflect.get(target, prop, receiver);
            },
            set(target, prop, value, receiver) {
                // 兼容站点可能直接赋初始数组： self.__pace_f = [a,b]
                if (prop === 'length') return Reflect.set(target, prop, value, receiver);
                return Reflect.set(target, prop, value, receiver);
            }
        });

        (self as any).__pace_f = proxyArr;
        (window as any).__pace_f = proxyArr;
    });

    try {
        // 先注册“先到先得”的监听，再导航，避免漏包
        const firstTypePromise = waitForFirstResponse(context, [
            { key: 'detail', test: (r: Response) => r.url().includes(DETAIL_PATH) && r.status() === 200 },
            { key: 'post', test: (r: Response) => r.url().includes(POST_PATH) && r.status() === 200 },
        ], 9_000); // 整体 9s 兜底超时，不逐个等待

        // 评论只做短时“有就用、没有不等”的监听
        const commentPromise = waitForResponseWithTimeout(
            context, (r: Response) => r.url().includes(COMMENT_PATH) && r.status() === 200, 8_000
        ).catch(() => null);

        await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 60_000 });

        try {
            // 优先尝试从内存读取图文数据
            let { aweme, comments } = await readPostMem(context, page);
            console.log(chalk.green('✓ 从内存读取图文数据成功'));

            const uploads = await handleImagePost(context, aweme);
            if (!comments) {
                console.warn(chalk.yellow('⚠ 从内存读取评论数据失败，尝试从网络请求获取评论数据'));

                const commentRes = await commentPromise;
                comments = commentRes && await safeJson<DouyinCommentResponse>(commentRes);
                if (!comments) {
                    console.warn(chalk.yellow('⚠ 无法从内存读取评论数据，且网络请求也未返回评论数据'));
                    comments = { comments: [], total: 0, status_code: 0 };
                } else {
                    console.log(chalk.green('✓ 从网络请求获取评论数据成功'));
                }
            } else {
                console.log(chalk.green('✓ 从内存读取评论数据成功'));
            }
            const saved = await saveImagePostToDB(context, aweme, comments, uploads); // 传递完整 JSON
            console.log(chalk.green.bold('✓ 图文作品保存成功'));
            return { type: "image", ...saved };
        } catch {

        }

        const commentRes = await commentPromise;
        const firstType = await firstTypePromise;

        if (!firstType) {
            console.error(chalk.red('✗ 既无法从内存读取数据，也无法从网络获得数据'));
            throw new Error('既无法从内存读取数据，也无法从网络获得数据。');
        }

        console.log(chalk.cyan(`📡 检测到作品类型: ${chalk.bold(firstType.key === 'post' ? '图文' : '视频')}`));

        let comments = commentRes && await safeJson<DouyinCommentResponse>(commentRes);
        if (!comments) {
            console.warn(chalk.yellow('⚠ 无法从内存读取评论数据，且网络请求也未返回评论数据'));
            comments = { comments: [], total: 0, status_code: 0 };
        }

        // 分支：视频 or 图文（两者只会有一个命中，先到先得）
        if (firstType.key === 'post') {
            // 图文作品
            const postJson = await safeJson<DouyinPostListResponse>(firstType.response);
            if (!postJson?.aweme_list?.length) throw new Error('图文作品响应为空');

            const currentURL = page.url();
            const target_aweme_id = currentURL.split('/').at(-1);
            const awemeList = postJson.aweme_list as unknown as DouyinImageAweme[];
            let aweme = awemeList.find((pt: DouyinImageAweme) => pt.aweme_id === target_aweme_id);
            if (!aweme) {
                throw new Error('既无法从内存读取数据，Post 列表中也不包含需要爬取的作品。');
            }

            const uploads = await handleImagePost(context, aweme);
            const saved = await saveImagePostToDB(context, aweme, comments, uploads, postJson); // 传递完整 JSON
            console.log(chalk.green.bold('✓ 图文作品保存成功'));
            return { type: "image", ...saved };
        } else if (firstType.key === 'detail') {
            // 视频作品
            const detail = (await safeJson<DouyinVideoDetailResponse>(firstType.response))!;

            // 找到比特率最高的 url
            const bestPlayAddr = pickBestPlayAddr(
                detail?.aweme_detail?.video.bit_rate
            );
            const bestVUrl = bestPlayAddr?.url_list?.[0];
            const fps = bestPlayAddr?.FPS ?? null; // 提取 FPS

            console.log(chalk.cyan(`📹 最佳视频 URL: ${chalk.dim(bestVUrl)}`));
            console.log(chalk.cyan(`🎞️  视频帧率: ${chalk.bold(fps || 'N/A')} FPS`));
            if (bestPlayAddr?.width && bestPlayAddr?.height) {
                console.log(chalk.cyan(`📐 视频分辨率: ${chalk.bold(`${bestPlayAddr.width}x${bestPlayAddr.height}`)}`));
            }

            // 下载视频并上传至 MinIO，获取外链
            let uploadedUrl: string | undefined;
            let coverUrl: string | undefined;
            if (bestVUrl && detail?.aweme_detail) {
                console.log(chalk.blue('⬇️  正在下载视频...'));
                const { buffer, contentType, ext } = await downloadBinary(context, bestVUrl);
                const awemeId = detail.aweme_detail.aweme_id;
                const fileName = generateUniqueFileName(`${awemeId}.${ext}`, 'douyin/videos');

                console.log(chalk.blue('⬆️  正在上传视频到 MinIO...'));
                uploadedUrl = await uploadFile(buffer, fileName, { 'Content-Type': contentType });
                console.log(chalk.green(`✓ 视频上传成功: ${chalk.underline(uploadedUrl)}`));

                // 提取首帧作为封面并上传
                try {
                    console.log(chalk.blue('🖼️  正在提取视频封面...'));
                    const cover = await extractFirstFrame(buffer);
                    if (cover) {
                        const coverName = generateUniqueFileName(`${awemeId}.jpg`, 'douyin/covers');
                        coverUrl = await uploadFile(cover.buffer, coverName, { 'Content-Type': cover.contentType });
                        console.log(chalk.green(`✓ 封面上传成功: ${chalk.underline(coverUrl)}`));
                    }
                } catch (e) {
                    console.warn(chalk.yellow(`⚠ 提取封面失败，跳过: ${(e as Error)?.message || e}`));
                }
            }

            const saved = await saveToDB(context, detail, comments, uploadedUrl, bestPlayAddr?.width, bestPlayAddr?.height, coverUrl, fps ?? undefined);
            console.log(chalk.green.bold('✓ 视频作品保存成功'));
            return { type: "video", ...saved };
        } else {
            throw new Error('无法判定作品类型（未命中详情或图文接口）');
        }
    } finally {
        console.log(chalk.gray('🧹 清理资源...'));
        await context.close();
        await browser.close();
        await prisma.$disconnect();
        console.log(chalk.gray('✓ 资源清理完成'));
    }
}