"""抖音内容抓取 — 浏览器自动化 + API 拦截 + 媒体下载"""

import asyncio
import subprocess
from pathlib import Path
from typing import Dict, List, Optional

import httpx
from nonebot import logger
from playwright.async_api import async_playwright

from ..models import DouyinFetchError
from ..utils import ensure_unique_path, get_temp_root
from .douyin_parser import (
    ParsedDouyinContent,
    extract_trailing_digits,
    is_animated_note,
    parse_animated_note_videos,
    parse_douyin_response,
    parse_note_images,
    parse_ssr_page,
    parse_video_urls,
)


def merge_video_audio(video_file: Path, audio_file: Path, out_file: Path):
    """分轨视频与音频合并"""
    subprocess.run(
        [
            "ffmpeg",
            "-i",
            str(video_file),
            "-i",
            str(audio_file),
            "-c:v",
            "copy",
            "-c:a",
            "copy",
            "-movflags",
            "faststart",
            "-y",
            str(out_file),
        ],
        check=True,
    )


# ============================= 主入口 =============================


async def fetch_douyin_content(
    douyin_url: str,
    cookies: List[dict],
    wait_seconds: int = 10,
    headless: bool = True,
) -> tuple[str | None, Path | List[Path] | None]:
    """
    获取抖音内容（视频或图文）

    返回:
        (title, content)
        - 视频: (title, Path)
        - 图文: (title, List[Path])
        - 失败: (None, None)
    """
    if not cookies:
        raise DouyinFetchError("cookies 为空")

    tmp_root = get_temp_root("douyin")
    api_response: Optional[dict] = None
    api_response_favorite: Optional[dict] = None
    aweme_id = 0
    # 目标作品 id（从入口 URL 提取）：aweme/post 返回的是作者作品列表，
    # 按此 id 精确匹配要解析的作品，避免取到作者的其他作品
    target_aweme_id = extract_trailing_digits(douyin_url) or ""
    referer_url = None

    async with async_playwright() as p:
        browser = await p.chromium.launch(
            executable_path="C:/Program Files/Google/Chrome/Application/chrome.exe",
            headless=headless,
            args=[
                "--autoplay-policy=no-user-gesture-required",
                "--disable-features=AutoplayDisableSuppression",
            ],
        )

        context = await browser.new_context(
            viewport={"width": 1280, "height": 720},
            device_scale_factor=2,
            user_agent=(
                "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
                "AppleWebKit/537.36 (KHTML, like Gecko) "
                "Chrome/122.0.0.0 Safari/537.36"
            ),
            locale="zh-CN",
        )

        await context.add_cookies(cookies)
        page = await context.new_page()

        async def handle_response(response):
            nonlocal api_response, api_response_favorite, aweme_id, referer_url
            try:
                if (
                    "https://www.douyin.com/note" in response.url
                    or "https://www.douyin.com/video" in response.url
                ):
                    referer_url = response.url
                    logger.info(f"作品链接：{referer_url}")
                    aweme_id = extract_trailing_digits(response.url)
                    logger.info(f"作品id：{aweme_id}")

                if "aweme/v1/web/aweme/detail" in response.url:
                    if not api_response:
                        logger.info(f"捕获到视频 API: {response.url}")
                        ct = response.headers.get("content-type", "")
                        if "json" in ct:
                            api_response = await response.json()
                            logger.info("API 响应已捕获")
                            return
                    else:
                        logger.info("API 已有捕获")
                        return

                elif "aweme/v1/web/aweme/post" in response.url:
                    logger.info(f"捕获到图文 API: {response.url}")
                    ct = response.headers.get("content-type", "")
                    if "json" in ct:
                        data = await response.json()
                        aweme_list = data.get("aweme_list", [])
                        if aweme_list:
                            # 列表是作者的全部作品，优先按目标作品 id 精确匹配
                            # （未登录/风控时目标作品可能不在列表里）
                            match_id = aweme_id or target_aweme_id
                            target_aweme = None
                            if match_id:
                                target_aweme = next(
                                    (
                                        a
                                        for a in aweme_list
                                        if str(a.get("aweme_id")) == str(match_id)
                                    ),
                                    None,
                                )
                            if not target_aweme:
                                target_aweme = aweme_list[0]
                            if target_aweme.get("images"):
                                logger.info("找到正确的图文 API 响应（包含图片数据）")
                                data["aweme_list"] = [target_aweme]
                                api_response = data
                                return
                            else:
                                logger.warning(
                                    "此响应不包含有效的图片数据，等待下一个请求"
                                )
            except Exception as e:
                logger.warning(f"处理响应失败: {e}")

        page.on("response", handle_response)

        await page.goto(douyin_url, wait_until="domcontentloaded")

        max_wait = wait_seconds
        for i in range(max_wait):
            if api_response:
                logger.info(f"成功在第 {i + 1} 秒捕获 API 响应")
                break
            await page.wait_for_timeout(1000)

        # 截取页面 HTML（在关闭浏览器前），用于 SSR 回退解析
        page_html = await page.content() if not api_response else None

        await browser.close()

    if not api_response and page_html:
        api_response = parse_ssr_page(page_html)
        if api_response:
            logger.info("通过 SSR 页面回退解析获取到图文数据")

    if not api_response:
        raise DouyinFetchError("无法捕获 API 响应，请检查网络或 URL")

    parsed = parse_douyin_response(api_response, referer_url)

    headers = {
        "Referer": "https://www.douyin.com/",
        "User-Agent": (
            "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
            "AppleWebKit/537.36 (KHTML, like Gecko) "
            "Chrome/122.0.0.0 Safari/537.36"
        ),
    }

    if parsed.media_type == "视频":
        content = await _process_video(
            api_response, tmp_root, parsed.file_name, aweme_id, headers
        )
        return parsed.file_name, content

    elif parsed.media_type == "图片":
        # 先解析 images 列表，区分纯动图和图文/图+视频
        images_urls, video_url = parse_note_images(
            api_response, api_response_favorite, aweme_id
        )
        if images_urls:
            # 有图片（纯图文 或 图+视频混合作品）
            content = await _process_note_with_parsed(
                images_urls,
                video_url,
                tmp_root,
                parsed.file_name,
                headers,
            )
        else:
            # 纯动图（所有项都是视频）
            content = await _process_animated_note(
                api_response, tmp_root, parsed.file_name, headers
            )
        return parsed.file_name, content

    return None, None


# ============================= 视频下载 =============================


async def _process_video(
    api_response: dict,
    tmp_root: Path,
    file_name: str,
    aweme_id: str,
    headers: Dict[str, str],
) -> Path:
    """处理视频内容，返回本地文件路径"""
    groups = parse_video_urls(api_response)

    best_group = None
    for g in groups.values():
        if g["FULL"] or (g["VIDEO"] and g["AUDIO"]):
            best_group = g
            break

    if not best_group:
        raise DouyinFetchError("没有可用的视频组合")

    # 完整视频 — 流式下载
    if best_group["FULL"]:
        full = best_group["FULL"]
        logger.info(f"找到完整视频，数量: {len(full)}")
        best = max(full, key=lambda x: x["br"])
        logger.info(f"选择码率: {best['br']} - {best['url'][:60]}...")

        output_path = ensure_unique_path(tmp_root / f"{file_name}.mp4")
        async with httpx.AsyncClient(headers=headers) as client:
            async with client.stream("GET", best["url"]) as resp:
                resp.raise_for_status()
                with open(output_path, "wb") as f:
                    async for chunk in resp.aiter_bytes(8192):
                        f.write(chunk)
        logger.info(f"视频下载完成: {output_path}")
        return output_path

    # 分轨视频 — 分别下载后合并
    logger.info(
        f"使用分轨模式，视频数: {len(best_group['VIDEO'])}, "
        f"音频数: {len(best_group['AUDIO'])}"
    )
    video = max(best_group["VIDEO"], key=lambda x: x["br"])
    audio = max(best_group["AUDIO"], key=lambda x: x["br"])
    logger.info(f"选择视频码率: {video['br']}")
    logger.info(f"选择音频码率: {audio['br']}")

    video_path = tmp_root / f"{file_name}_v.mp4"
    audio_path = tmp_root / f"{file_name}_a.mp4"
    output_path = ensure_unique_path(tmp_root / f"{file_name}.mp4")

    async with httpx.AsyncClient(headers=headers) as client:
        logger.info("开始下载视频...")
        async with client.stream("GET", video["url"]) as v:
            v.raise_for_status()
            with open(video_path, "wb") as f:
                async for chunk in v.aiter_bytes(8192):
                    f.write(chunk)

        logger.info("开始下载音频...")
        async with client.stream("GET", audio["url"]) as a:
            a.raise_for_status()
            with open(audio_path, "wb") as f:
                async for chunk in a.aiter_bytes(8192):
                    f.write(chunk)

    logger.info("合并视频和音频...")
    merge_video_audio(video_path, audio_path, output_path)
    video_path.unlink()
    audio_path.unlink()

    logger.info(f"视频下载完成: {output_path}")
    return output_path


# ============================= 图文下载 =============================


async def _process_note_with_parsed(
    images_urls: List[List[str]],
    video_url: Optional[str],
    tmp_root: Path,
    file_name: str,
    headers: Dict[str, str],
) -> List[Path]:
    """根据已解析的图片/视频 URL 列表，并行下载"""
    note_dir = ensure_unique_path(tmp_root / file_name)
    note_dir.mkdir(parents=True, exist_ok=True)
    logger.info(f"图文保存目录: {note_dir}")

    async def _download_one(idx: int, url: str, ext: str = "") -> Optional[Path]:
        if not ext:
            ext = _infer_extension(url)
        filename = f"{idx:03d}{ext}"
        filepath = note_dir / filename
        try:
            async with httpx.AsyncClient(headers=headers) as client:
                async with client.stream("GET", url) as resp:
                    resp.raise_for_status()
                    with open(filepath, "wb") as f:
                        async for chunk in resp.aiter_bytes(8192):
                            f.write(chunk)
            logger.info(f"已保存: {filename}")
            return filepath
        except Exception as e:
            logger.error(f"下载 {idx} 失败: {e}")
            return None

    tasks = [
        _download_one(i, url_list[0])
        for i, url_list in enumerate(images_urls, 1)
    ]

    # 图+视频混合作品：视频追加到下载任务
    if video_url:
        next_idx = len(images_urls) + 1
        tasks.append(_download_one(next_idx, video_url, ext=".mp4"))

    results = await asyncio.gather(*tasks)
    saved_paths: List[Path] = [p for p in results if p is not None]

    logger.info(f"图文下载完成，共 {len(saved_paths)} 个文件")
    return saved_paths


async def _process_note(
    api_response: dict,
    api_response_favorite: dict,
    tmp_root: Path,
    file_name: str,
    aweme_id: str,
    headers: Dict[str, str],
) -> List[Path]:
    """处理图文内容，并行下载所有图片；图+视频混合作品同时下载视频"""
    images_urls, video_url = parse_note_images(
        api_response, api_response_favorite, aweme_id
    )
    logger.info(f"解析到的图片链接:{images_urls}")

    if not images_urls and not video_url:
        raise DouyinFetchError("未找到图文链接")

    return await _process_note_with_parsed(
        images_urls, video_url, tmp_root, file_name, headers
    )


# ============================= 动图下载 =============================


async def _process_animated_note(
    api_response: dict,
    tmp_root: Path,
    file_name: str,
    headers: Dict[str, str],
) -> List[Path]:
    """处理动图内容（media_type=42），并行下载所有无声 mp4 视频"""
    video_urls = parse_animated_note_videos(api_response)
    logger.info(f"解析到的动图视频链接: {video_urls}")

    note_dir = ensure_unique_path(tmp_root / file_name)
    note_dir.mkdir(parents=True, exist_ok=True)
    logger.info(f"动图保存目录: {note_dir}")

    async def _download_one(idx: int, url: str) -> Optional[Path]:
        filename = f"{idx:03d}.mp4"
        filepath = note_dir / filename
        try:
            async with httpx.AsyncClient(headers=headers) as client:
                async with client.stream("GET", url) as resp:
                    resp.raise_for_status()
                    with open(filepath, "wb") as f:
                        async for chunk in resp.aiter_bytes(8192):
                            f.write(chunk)
            logger.info(f"动图视频已保存: {filename}")
            return filepath
        except Exception as e:
            logger.error(f"下载动图视频 {idx} 失败: {e}")
            return None

    tasks = [
        _download_one(i, url)
        for i, url in enumerate(video_urls, 1)
    ]
    results = await asyncio.gather(*tasks)
    saved_paths: List[Path] = [p for p in results if p is not None]

    logger.info(f"动图下载完成，共 {len(saved_paths)} 个视频")
    return saved_paths


def _infer_extension(url: str) -> str:
    """从 URL 推断文件扩展名"""
    extensions = [".webp", ".jpg", ".jpeg", ".png", ".gif", ".avif"]
    url_lower = url.lower()
    for ext in extensions:
        if ext in url_lower:
            return ext
    return ".jpg"