"""统一配置入口 — API 和 Worker 共享的基础配置。

所有服务通用配置定义在这里，两端各自的 Settings 类继承本类，
只追加服务特有字段。彻底消除重复定义和默认值不一致问题。
"""

import os
from typing import Optional

from pydantic_settings import BaseSettings, SettingsConfigDict


class SharedSettings(BaseSettings):
    """所有服务共享的基础配置。

    API 和 Worker 都继承本类，确保：
    1. 数据库/Redis/OSS/Celery 等核心配置默认值一致
    2. 环境变量命名统一（小写风格，pydantic-settings 自动兼容大写）
    3. 单例模式和 env 文件加载逻辑只实现一次
    """

    # ── 环境 ──────────────────────────────────────────────────────────────
    environment: str = "development"
    debug: bool = True
    auto_create_schema: bool = False

    # ── 数据库 ────────────────────────────────────────────────────────────
    database_url: str = "postgresql+psycopg://postgres:postgres@localhost:5432/xiaoxia_saas"
    database_pool_size: int = 20
    database_max_overflow: int = 10  # pool_size(20) + max_overflow(10) = 最大30连接
    database_pool_timeout: int = 30
    database_pool_recycle: int = 3600

    # ── Redis ────────────────────────────────────────────────────────────
    redis_url: str = "redis://localhost:6379/0"

    # ── Celery ───────────────────────────────────────────────────────────
    celery_broker_url: str = "redis://localhost:6379/0"
    celery_result_backend: str = "redis://localhost:6379/1"

    # ── OSS 阿里云 ──────────────────────────────────────────────────────
    oss_endpoint: str = "oss-cn-hangzhou.aliyuncs.com"
    oss_access_key_id: str = ""
    oss_access_key_secret: str = ""
    oss_bucket_name: str = "xiaoxia-autocut"
    oss_direct_upload_max_mb: int = 2000
    oss_direct_upload_expire_seconds: int = 900

    # ── CosyVoice (阿里云百炼语音合成) ───────────────────────────────────
    cosyvoice_api_key: str = ""
    cosyvoice_base_url: str = "https://dashscope.aliyuncs.com/api/v1"
    cosyvoice_model: str = "cosyvoice-v3-flash"
    cosyvoice_voice: str = "longxiaochun_v3"  # 默认音色（v3 系列系统音色带 _v3 后缀）
    cosyvoice_sample_rate: int = 22050
    cosyvoice_format: str = "mp3"  # 输出格式：mp3/wav/pcm
    # 音色克隆模型名（固定为 voice-enrollment）
    cosyvoice_clone_model: str = "voice-enrollment"

    # ── 豆包大模型（火山引擎方舟） ────────────────────────────────────────
    doubao_api_key: str = ""
    doubao_model: str = "doubao-seed-1-6-250615"
    doubao_base_url: str = "https://ark.cn-beijing.volces.com/api/v3"
    doubao_timeout: int = 30
    doubao_max_retries: int = 2

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        case_sensitive=False,
        extra="ignore",
    )


_settings: Optional[SharedSettings] = None


def get_shared_settings() -> SharedSettings:
    """获取共享配置单例。

    优先读取 APP_ENV 指定的环境文件（.env.{env}），不存在则读 .env。
    """
    global _settings
    if _settings is None:
        env = os.getenv("APP_ENV", "development")
        env_file = f".env.{env}" if env != "development" else ".env"
        if os.path.exists(env_file):
            _settings = SharedSettings(_env_file=env_file)
        else:
            _settings = SharedSettings()
    return _settings