"""CosyVoice 语音服务 — 适配阿里云百炼 DashScope API.

封装阿里云百炼 CosyVoice 语音合成 API，提供：
- 预置音色列表查询
- 音色克隆（提交 + 轮询状态）
- 语音合成（同步非流式调用）

API 文档:
- 音色克隆: https://help.aliyun.com/document_detail/3027318.html
- 语音合成: https://help.aliyun.com/zh/model-studio/cosyvoice-tts-http-api
"""

from __future__ import annotations

import logging
import time
from dataclasses import dataclass
from typing import Any, Callable, Optional

import httpx

from packages.domain.preset_voices import PresetVoice, get_preset_voices
from packages.shared.config import get_shared_settings

logger = logging.getLogger(__name__)


class CosyVoiceError(Exception):
    """CosyVoice API 调用异常。"""

    pass


class CosyVoiceTimeoutError(CosyVoiceError):
    """CosyVoice API 超时。"""

    pass


class CosyVoiceAuthError(CosyVoiceError):
    """CosyVoice API 认证失败。"""

    pass


@dataclass
class CloneResult:
    """音色克隆结果。"""

    voice_id: str
    request_id: str = ""


@dataclass
class SynthesizeResult:
    """语音合成结果。"""

    audio_url: str
    duration: float = 0.0
    file_size: int = 0
    request_id: str = ""


class CosyVoiceService:
    """CosyVoice 语音服务.

    封装阿里云百炼 CosyVoice API，提供音色克隆和语音合成功能.

    接口总览:
    - 音色克隆: POST /services/audio/tts/customization (model=voice-enrollment)
      - action=create_voice: 创建克隆音色，返回 voice_id（状态 DEPLOYING）
      - action=query_voice: 查询音色状态（DEPLOYING / OK / UNDEPLOYED）
    - 语音合成: POST /services/audio/tts/SpeechSynthesizer (model=cosyvoice-v3-flash)
      - 非流式: 同步返回音频 URL

    使用示例:
        service = CosyVoiceService(
            api_key="your-api-key",
            base_url="https://dashscope.aliyuncs.com/api/v1",
            model="cosyvoice-v3-flash",
        )

        # 音色克隆
        result = service.clone_voice(audio_url="https://example.com/audio.mp3")

        # 语音合成
        result = service.synthesize_speech(text="你好世界", voice_id="longxiaochun_v3")
    """

    # 音色状态轮询配置
    CLONE_POLL_INTERVAL = 5.0  # 秒
    CLONE_MAX_POLL_ATTEMPTS = 60  # 最多轮询 60 次（5分钟）

    # 重试配置
    MAX_RETRIES = 3
    RETRY_BACKOFF = 1.0  # 秒，指数退避基数

    def __init__(
        self,
        api_key: str = "",
        base_url: str = "",
        model: str = "",
        clone_model: str = "",
        http_client: Optional[httpx.Client] = None,
        audio_url_signer: Optional[Callable[[str], str]] = None,
    ) -> None:
        """初始化 CosyVoice 服务.

        Args:
            api_key: DashScope API Key，为空时从配置读取
            base_url: DashScope API Base URL，为空时从配置读取
            model: 语音合成模型名称，为空时从配置读取
            clone_model: 音色克隆模型名称，为空时从配置读取
            http_client: 可选的 HTTP 客户端（用于测试注入）
            audio_url_signer: 可选的音频URL预签名函数，签名式 fn(url) -> str.
                用于私有 bucket 下，将裸 URL 转为预签名 URL，
                确保 CosyVoice 服务器能下载参考音频.
        """
        settings = get_shared_settings()

        self._api_key = api_key or settings.cosyvoice_api_key
        self._base_url = base_url or settings.cosyvoice_base_url
        self._model = model or settings.cosyvoice_model
        self._clone_model = clone_model or getattr(settings, "cosyvoice_clone_model", "voice-enrollment")
        self._audio_url_signer = audio_url_signer

        # base_url 规范化：去掉末尾的路径残留（兼容旧版配置）
        # 旧版 .env 模板中 base_url 包含 /services/aigc/text2audio 完整路径，
        # 新版只需 /api/v1，具体路径由代码拼接。这里自动修正，避免配置滞后导致418。
        if "/services/aigc/text2audio" in self._base_url:
            old_url = self._base_url
            # 截取到 /api/v1 为止
            idx = self._base_url.find("/api/v1")
            if idx >= 0:
                self._base_url = self._base_url[: idx + len("/api/v1")]
            logger.warning(
                "[CosyVoice Config] base_url包含旧版text2audio路径，已自动修正: " "%s -> %s",
                old_url,
                self._base_url,
            )

        self._client = http_client or httpx.Client(
            timeout=httpx.Timeout(60.0, connect=10.0),
        )
        self._owns_client = http_client is None

        # 启动时打印配置（脱敏），方便排查环境变量覆盖问题
        if self._owns_client:
            masked_key = ""
            if self._api_key:
                if len(self._api_key) > 8:
                    masked_key = f"{self._api_key[:4]}...{self._api_key[-4:]}"
                else:
                    masked_key = "***"
            logger.info(
                "[CosyVoice Config] 初始化配置: "
                "model=%s, base_url=%s, default_voice=%s, "
                "sample_rate=%d, format=%s, api_key=%s",
                self._model,
                self._base_url,
                getattr(settings, "cosyvoice_voice", "(unset)"),
                settings.cosyvoice_sample_rate,
                settings.cosyvoice_format,
                masked_key or "(empty)",
            )

    def __enter__(self) -> CosyVoiceService:
        return self

    def __exit__(self, *args: Any) -> None:
        self.close()

    def close(self) -> None:
        """关闭 HTTP 客户端。"""
        if self._owns_client and self._client:
            self._client.close()

    # ── 预置音色 ─────────────────────────────────────────

    def list_preset_voices(self) -> list[PresetVoice]:
        """获取预置音色列表.

        Returns:
            预置音色列表
        """
        return get_preset_voices()

    # ── 音色克隆 ─────────────────────────────────────────

    def submit_clone_task(
        self,
        audio_url: str,
        voice_name: str = "",
        language: str = "zh-CN",
        target_model: str = "",
    ) -> dict:
        """提交音色克隆任务（非阻塞）.

        调用百炼 voice-enrollment API 创建克隆音色.
        创建后音色状态为 DEPLOYING，需通过 query_voice_status 轮询直到 OK.

        Args:
            audio_url: 参考音频 URL（必须公网可访问）
            voice_name: 音色名称前缀（字母数字，最多10字符）
            language: 语言代码（zh-CN 会转换为 zh）
            target_model: 目标合成模型，默认使用当前 model

        Returns:
            dict: {"voice_id": str, "status": str, "request_id": str}
                  voice_id 非空，status 通常为 DEPLOYING

        Raises:
            CosyVoiceError: API 调用失败
            CosyVoiceAuthError: 认证失败
            ValueError: 参数无效
        """
        if not audio_url:
            raise ValueError("audio_url 不能为空")
        if not self._api_key:
            raise CosyVoiceAuthError("CosyVoice API Key 未配置")

        # voice_name 作为 prefix，限制字母数字，最多10字符
        # 不符合要求的做清洗
        prefix = self._sanitize_prefix(voice_name) if voice_name else "clone"

        # 语言转换：zh-CN → zh，保留 ISO 639-1 格式
        lang_code = language.split("-")[0].lower() if language else "zh"

        target = target_model or self._model

        # 如果配置了 audio_url_signer，对音频URL做预签名
        # （私有 bucket 下 CosyVoice 服务器无法直接访问裸 URL）
        signed_audio_url = audio_url
        if self._audio_url_signer:
            try:
                signed_audio_url = self._audio_url_signer(audio_url)
                logger.info("音频URL已预签名: original=%s signed_prefix=%s", audio_url[:80], signed_audio_url[:80])
            except Exception as e:
                logger.warning("音频URL预签名失败，使用原始URL: %s", e)

        payload = {
            "model": self._clone_model,
            "input": {
                "action": "create_voice",
                "target_model": target,
                "prefix": prefix,
                "url": signed_audio_url,
                "language_hints": [lang_code],
            },
        }

        response = self._call_api(
            method="POST",
            path="/services/audio/tts/customization",
            json=payload,
            timeout=60.0,
        )

        output = response.get("output", {})
        voice_id = output.get("voice_id", "")
        status = output.get("status", "DEPLOYING")
        request_id = response.get("request_id", "")

        if not voice_id:
            raise CosyVoiceError(f"CosyVoice API 未返回 voice_id: {response}")

        return {
            "voice_id": voice_id,
            "status": status,
            "request_id": request_id,
        }

    def query_voice_status(self, voice_id: str) -> dict:
        """查询音色状态（单次查询，不轮询）.

        Args:
            voice_id: 音色 ID

        Returns:
            dict: {"status": str, "target_model": str, "gmt_create": str,
                   "gmt_modified": str, "resource_link": str}
                  status 为 DEPLOYING / OK / UNDEPLOYED

        Raises:
            CosyVoiceError: API 调用失败
            CosyVoiceAuthError: 认证失败
        """
        if not self._api_key:
            raise CosyVoiceAuthError("CosyVoice API Key 未配置")

        if not voice_id:
            raise ValueError("voice_id 不能为空")

        payload = {
            "model": self._clone_model,
            "input": {
                "action": "query_voice",
                "voice_id": voice_id,
            },
        }

        response = self._call_api(
            method="POST",
            path="/services/audio/tts/customization",
            json=payload,
            timeout=30.0,
        )

        output = response.get("output", {})
        return {
            "status": output.get("status", ""),
            "target_model": output.get("target_model", ""),
            "gmt_create": output.get("gmt_create", ""),
            "gmt_modified": output.get("gmt_modified", ""),
            "resource_link": output.get("resource_link", ""),
        }

    def check_task_status(self, task_id: str) -> dict:
        """查询克隆任务状态（兼容旧接口，实际用 voice_id 查询）.

        为了兼容旧代码，task_id 参数名保留，但实际传的是 voice_id.

        Args:
            task_id: 音色 ID（兼容旧接口名）

        Returns:
            dict: {"status": str, "voice_id": str, "message": str}
        """
        result = self.query_voice_status(task_id)
        return {
            "status": result["status"],
            "voice_id": task_id,
            "message": "",
        }

    def poll_clone_task(self, voice_id: str, timeout: float = 300.0) -> dict:
        """轮询音色克隆状态直到完成或超时.

        供 Celery 后台任务调用，轮询直到状态变为 OK 或 UNDEPLOYED.

        Args:
            voice_id: 音色 ID
            timeout: 超时时间（秒），默认 300

        Returns:
            dict: {"voice_id": str}

        Raises:
            CosyVoiceError: 任务失败（状态 UNDEPLOYED）
            CosyVoiceTimeoutError: 超时
        """
        start_time = time.time()
        attempts = 0

        while attempts < self.CLONE_MAX_POLL_ATTEMPTS:
            elapsed = time.time() - start_time
            if elapsed > timeout:
                raise CosyVoiceTimeoutError(f"音色克隆任务超时（{timeout}秒）: voice_id={voice_id}")

            result = self.query_voice_status(voice_id)
            status = result.get("status", "").upper()

            if status == "OK":
                return {"voice_id": voice_id}
            elif status == "UNDEPLOYED":
                raise CosyVoiceError(f"音色克隆任务失败（审核未通过）: voice_id={voice_id}")
            elif status in ("DEPLOYING", "PENDING", "PROCESSING", ""):
                # 继续轮询
                time.sleep(self.CLONE_POLL_INTERVAL)
                attempts += 1
            else:
                logger.warning("未知的音色状态: %s (voice_id=%s)", status, voice_id)
                time.sleep(self.CLONE_POLL_INTERVAL)
                attempts += 1

        raise CosyVoiceTimeoutError(f"音色克隆任务轮询次数超限: voice_id={voice_id}")

    def clone_voice(
        self,
        audio_url: str,
        voice_name: str = "",
        language: str = "zh-CN",
        timeout: float = 300.0,
        target_model: str = "",
    ) -> CloneResult:
        """克隆音色（阻塞，直到完成或超时）.

        提交音色克隆到百炼 API，并轮询直到状态变为 OK 或超时.

        Args:
            audio_url: 参考音频 URL（必须公网可访问）
            voice_name: 音色名称前缀
            language: 语言代码
            timeout: 超时时间（秒）
            target_model: 目标合成模型

        Returns:
            CloneResult: 克隆结果，包含 voice_id

        Raises:
            CosyVoiceError: API 调用失败或克隆失败
            CosyVoiceTimeoutError: 超时
            CosyVoiceAuthError: 认证失败
            ValueError: 参数无效
        """
        submit_result = self.submit_clone_task(
            audio_url=audio_url,
            voice_name=voice_name,
            language=language,
            target_model=target_model,
        )

        voice_id = submit_result["voice_id"]
        request_id = submit_result["request_id"]

        # 如果创建时已经是 OK 状态，直接返回
        if submit_result.get("status", "").upper() == "OK":
            return CloneResult(voice_id=voice_id, request_id=request_id)

        # 否则轮询
        result = self.poll_clone_task(voice_id, timeout=timeout)
        return CloneResult(voice_id=result["voice_id"], request_id=request_id)

    # ── 语音合成 ─────────────────────────────────────────

    def submit_synthesize_task(
        self,
        text: str,
        voice_id: str = "",
        sample_rate: int = 0,
        format: str = "",
        speed: float = 1.0,
        volume: int = 50,
    ) -> dict:
        """提交语音合成任务（同步非流式，直接返回结果）.

        CosyVoice SpeechSynthesizer 非流式接口是同步的，
        调用后直接返回音频 URL. 此方法保持与旧接口兼容.

        Args:
            text: 要合成的文本
            voice_id: 音色 ID（预置音色或克隆音色）
            sample_rate: 采样率（Hz），0 表示使用配置默认值
            format: 输出格式（mp3/wav/pcm），空表示使用配置默认值
            speed: 语速（0.5-2.0），1.0 为正常速度
            volume: 音量（0-100），默认 50

        Returns:
            dict: {"audio_url": str, "request_id": str,
                   "duration": float, "file_size": int}

        Raises:
            CosyVoiceError: API 调用失败
            CosyVoiceAuthError: 认证失败
            ValueError: 参数无效
        """
        if not text:
            raise ValueError("text 不能为空")
        if not voice_id:
            raise ValueError("voice_id 不能为空")
        if not self._api_key:
            raise CosyVoiceAuthError("CosyVoice API Key 未配置")

        settings = get_shared_settings()

        payload = {
            "model": self._model,
            "input": {
                "text": text,
                "voice": voice_id,
                "format": format or settings.cosyvoice_format,
                "sample_rate": sample_rate or settings.cosyvoice_sample_rate,
                "rate": speed,
                "volume": volume,
            },
        }

        response = self._call_api(
            method="POST",
            path="/services/audio/tts/SpeechSynthesizer",
            json=payload,
            timeout=120.0,
        )

        output = response.get("output", {})
        audio = output.get("audio", {})
        audio_url = audio.get("url", "")
        request_id = response.get("request_id", "")

        if not audio_url:
            raise CosyVoiceError(f"CosyVoice API 未返回 audio_url: {response}")

        return {
            "task_id": "",  # 同步接口无 task_id，兼容旧接口
            "audio_url": audio_url,
            "duration": 0.0,  # 同步接口不返回 duration
            "file_size": 0,  # 同步接口不返回 file_size
            "request_id": request_id,
        }

    def poll_synthesize_task(self, task_id: str, timeout: float = 120.0) -> dict:
        """轮询合成任务（同步接口无需轮询，保留兼容）.

        CosyVoice SpeechSynthesizer 非流式接口是同步的，
        此方法仅为保持接口兼容，实际调用时 task_id 应该为空.

        Raises:
            CosyVoiceError: 同步接口无需轮询
        """
        raise CosyVoiceError("CosyVoice 非流式合成接口是同步的，无需轮询. " "请直接使用 submit_synthesize_task().")

    def synthesize_speech(
        self,
        text: str,
        voice_id: str = "",
        sample_rate: int = 0,
        format: str = "",
        speed: float = 1.0,
        volume: int = 50,
        timeout: float = 120.0,
    ) -> SynthesizeResult:
        """语音合成（同步非流式）.

        调用百炼 CosyVoice SpeechSynthesizer 非流式接口，
        直接返回合成音频 URL.

        Args:
            text: 要合成的文本
            voice_id: 音色 ID（预置音色或克隆音色）
            sample_rate: 采样率（Hz），0 表示使用配置默认值
            format: 输出格式（mp3/wav/pcm），空表示使用配置默认值
            speed: 语速（0.5-2.0），1.0 为正常速度
            volume: 音量（0-100），默认 50
            timeout: 超时时间（秒），保留参数兼容

        Returns:
            SynthesizeResult: 合成结果，包含 audio_url

        Raises:
            CosyVoiceError: API 调用失败
            CosyVoiceAuthError: 认证失败
            ValueError: 参数无效
        """
        result = self.submit_synthesize_task(
            text=text,
            voice_id=voice_id,
            sample_rate=sample_rate,
            format=format,
            speed=speed,
            volume=volume,
        )

        return SynthesizeResult(
            audio_url=result["audio_url"],
            duration=result.get("duration", 0.0),
            file_size=result.get("file_size", 0),
            request_id=result.get("request_id", ""),
        )

    # ── 内部方法 ─────────────────────────────────────────

    def _sanitize_prefix(self, name: str) -> str:
        """清洗音色名称为合法的 prefix（字母数字，最多10字符）.

        Args:
            name: 原始音色名称

        Returns:
            清洗后的 prefix
        """
        # 只保留字母和数字
        cleaned = "".join(c for c in name if c.isalnum())
        # 最多10字符
        cleaned = cleaned[:10]
        # 如果清洗后为空，用默认值
        if not cleaned:
            cleaned = "clone"
        return cleaned

    def _call_api(
        self,
        method: str,
        path: str,
        json: Optional[dict] = None,
        timeout: float = 30.0,
    ) -> dict:
        """调用 DashScope API.

        支持重试和错误处理.

        Args:
            method: HTTP 方法（GET/POST）
            path: API 路径（以 / 开头）
            json: 请求体
            timeout: 超时时间（秒）

        Returns:
            API 响应字典

        Raises:
            CosyVoiceError: API 调用失败
            CosyVoiceAuthError: 认证失败
            CosyVoiceTimeoutError: 超时
        """
        url = f"{self._base_url}{path}"
        headers = {
            "Authorization": f"Bearer {self._api_key}",
            "Content-Type": "application/json",
        }

        # DEBUG: 打印完整请求信息，用于排查418错误
        import json as json_lib

        safe_headers = {k: v for k, v in headers.items()}
        if "Authorization" in safe_headers:
            token = safe_headers["Authorization"]
            if len(token) > 20:
                safe_headers["Authorization"] = token[:13] + "..." + token[-4:]
        logger.info(
            "[CosyVoice Debug] 请求详情: " "method=%s, url=%s, headers=%s, body=%s",
            method,
            url,
            safe_headers,
            json_lib.dumps(json, ensure_ascii=False) if json else "None",
        )

        last_error: Optional[Exception] = None

        for attempt in range(self.MAX_RETRIES):
            try:
                response = self._client.request(
                    method=method,
                    url=url,
                    headers=headers,
                    json=json,
                    timeout=timeout,
                )

                # DEBUG: 打印响应状态和完整响应体
                logger.info(
                    "[CosyVoice Debug] 响应详情: " "status=%d, body=%s",
                    response.status_code,
                    response.text[:2000],  # 最多2000字符，避免日志过大
                )

                # 处理响应
                if response.status_code == 200:
                    return response.json()
                elif response.status_code in (401, 403):
                    raise CosyVoiceAuthError(f"CosyVoice API 认证失败: HTTP {response.status_code}")
                elif response.status_code == 400:
                    # 客户端错误，不重试
                    body_text = response.text
                    try:
                        body = response.json()
                        code = body.get("code", "")
                        message = body.get("message", "")
                        raise CosyVoiceError(f"CosyVoice API 参数错误: HTTP 400, " f"code={code}, message={message}")
                    except ValueError as _e:
                        raise CosyVoiceError(f"CosyVoice API 调用失败: HTTP 400, body={body_text}") from _e
                elif response.status_code >= 500:
                    # 服务端错误，可重试
                    last_error = CosyVoiceError(f"CosyVoice API 服务端错误: HTTP {response.status_code}")
                    logger.warning(
                        "CosyVoice API 失败 (尝试 %d/%d): HTTP %d",
                        attempt + 1,
                        self.MAX_RETRIES,
                        response.status_code,
                    )
                else:
                    # 其他客户端错误，不重试
                    raise CosyVoiceError(
                        f"CosyVoice API 调用失败: HTTP {response.status_code}, " f"body={response.text}"
                    )

            except httpx.TimeoutException as e:
                last_error = CosyVoiceTimeoutError(f"请求超时: {e}")
                logger.warning(
                    "CosyVoice API 超时 (尝试 %d/%d)",
                    attempt + 1,
                    self.MAX_RETRIES,
                )
            except httpx.RequestError as e:
                last_error = CosyVoiceError(f"请求错误: {e}")
                logger.warning(
                    "CosyVoice API 请求错误 (尝试 %d/%d): %s",
                    attempt + 1,
                    self.MAX_RETRIES,
                    e,
                )

            # 指数退避
            if attempt < self.MAX_RETRIES - 1:
                sleep_time = self.RETRY_BACKOFF * (2**attempt)
                time.sleep(sleep_time)

        # 所有重试都失败
        if last_error:
            raise last_error
        raise CosyVoiceError("CosyVoice API 调用失败，未知错误")