"""
环境变量和配置模块

统一管理项目路径、环境配置等
供整个项目共用
"""

import os
from pathlib import Path
from typing import Literal

# ============================================================
# 路径常量
# ============================================================

USER_HOME_ROOT = Path.home()

# project_config.py 位于项目根目录
PROJECT_ROOT = Path(__file__).parent.resolve()

# api_server 目录路径
API_SERVER_ROOT = PROJECT_ROOT / "api_server"

# GPT_SoVITS 模块路径
GPT_SOVITS_ROOT = PROJECT_ROOT / "GPT_SoVITS"

DEFAULT_APP_DIR = USER_HOME_ROOT / '.moyoyo-tts'

# 默认数据目录
DEFAULT_DATA_DIR = DEFAULT_APP_DIR / "data"

DEFAULT_MODEL_DIR = DEFAULT_APP_DIR / "models"

# 预训练模型目录
PRETRAINED_MODELS_DIR = DEFAULT_MODEL_DIR / "pretrained_models"

# 日志目录
LOGS_DIR = PROJECT_ROOT / "logs"


# ============================================================
# 配置类
# ============================================================

class Settings:
    """
    API Server 配置
    
    支持从环境变量读取配置，提供合理的默认值
    
    Example:
        >>> from project_config import settings
        >>> print(settings.PROJECT_ROOT)
        >>> print(settings.DEPLOYMENT_MODE)
    """

    # 部署模式
    DEPLOYMENT_MODE: Literal["local", "server"] = os.getenv("DEPLOYMENT_MODE", "local")

    # API 配置
    API_V1_PREFIX: str = os.getenv("API_V1_PREFIX", "/api/v1")
    API_HOST: str = os.getenv("API_HOST", "0.0.0.0")
    API_PORT: int = int(os.getenv("API_PORT", "8000"))

    # 路径配置（可通过环境变量覆盖）
    PROJECT_ROOT: Path = Path(os.getenv("PROJECT_ROOT", str(PROJECT_ROOT)))
    API_SERVER_ROOT: Path = Path(os.getenv("API_SERVER_ROOT", str(API_SERVER_ROOT)))
    DATA_DIR: Path = Path(os.getenv("DATA_DIR", str(DEFAULT_DATA_DIR)))

    # SQLite 数据库路径
    SQLITE_PATH: Path = Path(os.getenv("SQLITE_PATH", str(DEFAULT_DATA_DIR / "tasks.db")))
    
    # 实验根目录（训练输出目录）
    EXP_ROOT: Path = Path(os.getenv("EXP_ROOT", str(LOGS_DIR)))

    # 任务配置
    LOCAL_MAX_WORKERS: int = int(os.getenv("LOCAL_MAX_WORKERS", "1"))

    # 预训练模型路径
    BERT_PRETRAINED_DIR: str = os.getenv(
        "BERT_PRETRAINED_DIR",
        str(PRETRAINED_MODELS_DIR / "chinese-roberta-wwm-ext-large")
    )
    SSL_PRETRAINED_DIR: str = os.getenv(
        "SSL_PRETRAINED_DIR",
        str(PRETRAINED_MODELS_DIR / "chinese-hubert-base")
    )
    PRETRAINED_S2G: str = os.getenv(
        "PRETRAINED_S2G",
        str(PRETRAINED_MODELS_DIR / "gsv-v2final-pretrained" / "s2G2333k.pth")
    )
    PRETRAINED_S2D: str = os.getenv(
        "PRETRAINED_S2D",
        str(PRETRAINED_MODELS_DIR / "gsv-v2final-pretrained" / "s2D2333k.pth")
    )
    PRETRAINED_S1: str = os.getenv(
        "PRETRAINED_S1",
        str(PRETRAINED_MODELS_DIR / "gsv-v2final-pretrained" / "s1bert25hz-5kh-longer-epoch=12-step=369668.ckpt")
    )

    # Pipeline 脚本路径
    @property
    def PIPELINE_SCRIPT_PATH(self) -> Path:
        """Pipeline 执行脚本路径"""
        return self.API_SERVER_ROOT / "app" / "scripts" / "run_pipeline.py"

    # 临时配置文件目录
    @property
    def CONFIGS_DIR(self) -> Path:
        """临时配置文件目录"""
        path = self.DATA_DIR / "configs"
        path.mkdir(parents=True, exist_ok=True)
        return path

    def __repr__(self) -> str:
        return (
            f"Settings(\n"
            f"  DEPLOYMENT_MODE={self.DEPLOYMENT_MODE!r},\n"
            f"  PROJECT_ROOT={self.PROJECT_ROOT},\n"
            f"  API_SERVER_ROOT={self.API_SERVER_ROOT},\n"
            f"  DATA_DIR={self.DATA_DIR},\n"
            f"  SQLITE_PATH={self.SQLITE_PATH},\n"
            f")"
        )


# 全局配置实例
settings = Settings()


def get_pythonpath() -> str:
    """
    获取 PYTHONPATH 环境变量值
    
    用于子进程启动时设置正确的模块搜索路径
    
    Returns:
        PYTHONPATH 字符串
    """
    paths = [
        str(PROJECT_ROOT),
        str(GPT_SOVITS_ROOT),
    ]
    return os.pathsep.join(paths)


def ensure_data_dirs() -> None:
    """
    确保必要的数据目录存在
    """
    settings.DATA_DIR.mkdir(parents=True, exist_ok=True)
    settings.CONFIGS_DIR.mkdir(parents=True, exist_ok=True)