import os
import subprocess
import threading
import asyncio
import uuid
import queue
import time
import signal
import sys
import spider
import stream

class AdaptiveHLS2YouTube:
    def __init__(self, max_bitrate=6000, min_bitrate=3000, audio_bitrate=192,
                 delay_sec=30, segment_time=2, check_interval=5):
        self.processes = {}
        self.stop_flag = threading.Event()
        self.delay_sec = delay_sec
        self.segment_time = segment_time
        self.check_interval = check_interval
        self.buffer_queue = queue.Queue()
        self.max_bitrate = max_bitrate
        self.min_bitrate = min_bitrate
        self.audio_bitrate = audio_bitrate
        self.current_bitrate = max_bitrate

    def start_stream(self, real_url, youtube_key, room_name=None):
        room_name = room_name or f"抖音_{str(uuid.uuid4())[:8]}"
        print(f"[{room_name}] 启动推流，目标 YouTube Key: {youtube_key}")
        threading.Thread(target=self._pull_thread, args=(real_url,), daemon=True).start()
        threading.Thread(target=self._push_thread, args=(youtube_key, room_name), daemon=True).start()
        threading.Thread(target=self._abr_thread, daemon=True).start()

    def _pull_thread(self, real_url):
        cmd = [
            "ffmpeg",
            "-rw_timeout", "50000000",
            "-user_agent", "Mozilla/5.0",
            "-headers", "Referer: https://www.douyin.com/",
            "-fflags", "+nobuffer+genpts",
            "-flags", "low_delay",
            "-reconnect", "1",
            "-reconnect_at_eof", "1",
            "-reconnect_streamed", "1",
            "-reconnect_delay_max", "10",
            "-i", real_url,
            "-c", "copy",
            "-f", "mpegts",
            "-"
        ]
        try:
            proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
            while not self.stop_flag.is_set():
                data = proc.stdout.read(188*50)
                if not data:
                    time.sleep(0.05)
                    continue
                self.buffer_queue.put(data)
        except Exception as e:
            print(f"拉流异常: {e}")

    def _push_thread(self, youtube_key, room_name):
        min_buffer = max(1, self.delay_sec // self.segment_time)
        while not self.stop_flag.is_set():
            if self.buffer_queue.qsize() < min_buffer:
                time.sleep(0.05)
                continue

            cmd = [
                "ffmpeg",
                "-re",
                "-f", "mpegts",
                "-i", "-",
                "-c:v", "libx264",
                "-preset", "veryfast",
                "-tune", "zerolatency",
                "-b:v", f"{self.current_bitrate}k",
                "-maxrate", f"{self.current_bitrate}k",
                "-bufsize", f"{self.current_bitrate*2}k",
                "-r", "30",
                "-g", "60",
                "-c:a", "aac",
                "-b:a", f"{self.audio_bitrate}k",
                "-f", "flv",
                f"rtmp://a.rtmp.youtube.com/live2/{youtube_key}"
            ]
            try:
                proc = subprocess.Popen(cmd, stdin=subprocess.PIPE)
                self.processes[room_name] = proc
                while not self.stop_flag.is_set():
                    if not self.buffer_queue.empty():
                        data = self.buffer_queue.get()
                        proc.stdin.write(data)
                        proc.stdin.flush()
                    else:
                        time.sleep(0.01)
            except Exception as e:
                print(f"[{room_name}] 推流异常: {e}")

    def _abr_thread(self):
        # 动态码率调节
        while not self.stop_flag.is_set():
            queue_len = self.buffer_queue.qsize()
            if queue_len > 100:  # 队列积压大 → 网络慢 → 降低码率
                new_bitrate = max(self.min_bitrate, self.current_bitrate - 500)
            elif queue_len < 30:  # 队列空 → 网络好 → 提高码率
                new_bitrate = min(self.max_bitrate, self.current_bitrate + 500)
            else:
                new_bitrate = self.current_bitrate
            if new_bitrate != self.current_bitrate:
                print(f"[ABR] 调整码率: {self.current_bitrate}k -> {new_bitrate}k")
                self.current_bitrate = new_bitrate
            time.sleep(self.check_interval)

    def stop_all(self):
        print("停止所有推流...")
        self.stop_flag.set()
        for proc in self.processes.values():
            if proc.poll() is None:
                proc.terminate()

# ----------------- 抖音解析逻辑 -----------------
async def get_douyin_real_url(record_url, record_quality="原画"):
    if 'v.douyin.com' not in record_url and '/user/' not in record_url:
        json_data = await spider.get_douyin_stream_data(url=record_url)
    else:
        json_data = await spider.get_douyin_app_stream_data(url=record_url)
    port_info = await stream.get_douyin_stream_url(json_data, record_quality, None)
    return port_info.get("record_url")

# ----------------- 启动推流 -----------------
def start_douyin_to_youtube(record_url, youtube_key, room_name=None, delay_sec=30):
    try:
        real_url = asyncio.run(get_douyin_real_url(record_url))
    except Exception as e:
        print(f"获取真实直播流失败: {e}")
        return
    if not real_url:
        print("获取真实直播流失败")
        return
    print(f"实际直播流: {real_url}")
    hls2yt = AdaptiveHLS2YouTube(delay_sec=delay_sec)
    hls2yt.start_stream(real_url, youtube_key, room_name)
    return hls2yt

# ----------------- 示例 -----------------
if __name__ == "__main__":
    DOUYIN_URL = "https://live.douyin.com/640087893839"
    YOUTUBE_KEY = "qxvb-r47b-r5ju-6ud3-6k7z"

    hls_instance = start_douyin_to_youtube(DOUYIN_URL, YOUTUBE_KEY, delay_sec=30)

    def signal_handler(sig, frame):
        if hls_instance:
            hls_instance.stop_all()
        sys.exit(0)

    signal.signal(signal.SIGINT, signal_handler)
    signal.signal(signal.SIGTERM, signal_handler)

    while True:
        time.sleep(60)