"""统一配置：从 .env / 环境变量读 PG、调度器、数据源开关等参数。

2026-06-16 重构：项目只支持 PostgreSQL，MySQL 字段全部移除。
"""
from __future__ import annotations

import os
from pathlib import Path
from typing import Optional

from pydantic_settings import BaseSettings, SettingsConfigDict

try:
    from dotenv import load_dotenv
    _HAS_DOTENV = True
except ImportError:
    _HAS_DOTENV = False


_PROJECT_ROOT = Path(__file__).resolve().parent.parent.parent

# 启动时自动把 .env 加载到 os.environ，使下游 `os.environ.get(...)` 代码
# （如 app/sources/mairui.py / xueqiu.py）能拿到 credentials。
if _HAS_DOTENV:
    _env_file = _PROJECT_ROOT / ".env"
    if _env_file.exists():
        load_dotenv(_env_file, override=False)


class Settings(BaseSettings):
    """应用配置。所有字段都可以通过环境变量或 .env 文件覆盖。"""

    # Runtime mode: "docker" | "systemd"
    #   docker  : 单容器运行，依赖进程内 scheduler 触发所有同步任务
    #   systemd : Linux 宿主机运行，由 systemd timer/service 触发任务，
    #             进程内 scheduler 必须关闭，避免双调度器重叠
    runtime_mode: str = "docker"

    # Scheduler
    scheduler_tick_seconds: int = 5
    scheduler_timezone: str = "Asia/Shanghai"
    scheduler_auto_seed: bool = True

    # API
    api_host: str = "0.0.0.0"
    api_port: int = 8100

    # Logging
    log_level: str = "INFO"
    log_dir: str = "./logs"

    # Datasources
    ds_baostock_enabled: bool = True
    ds_sina_enabled: bool = True
    xueqiu_token: str = ""

    # PostgreSQL — 完整 URL（覆盖下面 PG_HOST 等）
    pg_url: str = ""
    pg_host: str = "127.0.0.1"
    pg_port: int = 5432
    pg_user: str = "market_sync"
    pg_password: str = "market_sync"
    pg_db_name: str = "market_data"

    # QMT Bridge
    qmt_bridge_url: str = "http://127.0.0.1:8610"

    # Trading calendar
    trading_holidays: str = ""

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

    @property
    def project_root(self) -> Path:
        return _PROJECT_ROOT

    @property
    def log_path(self) -> Path:
        p = Path(self.log_dir)
        if not p.is_absolute():
            p = _PROJECT_ROOT / p
        p.mkdir(parents=True, exist_ok=True)
        return p

    @property
    def holidays_list(self) -> list[str]:
        if not self.trading_holidays:
            return []
        return [d.strip() for d in self.trading_holidays.split(",") if d.strip()]

    def pg_sqlalchemy_url(self) -> str:
        """构造 PG 的 SQLAlchemy URL（自动剥掉 +psycopg2 让 SQLAlchemy 决定 driver）。"""
        if self.pg_url:
            return self.pg_url
        return (
            f"postgresql+psycopg2://{self.pg_user}:{self.pg_password}"
            f"@{self.pg_host}:{self.pg_port}/{self.pg_db_name}"
        )


_settings: Optional[Settings] = None


def get_settings() -> Settings:
    """全局单例。"""
    global _settings
    if _settings is None:
        _settings = Settings()
    return _settings


settings = get_settings()