"""配置加载模块 -- 从 config.yaml / 环境变量读取配置"""

from __future__ import annotations

import os
from pathlib import Path
from typing import Any

import yaml
from pydantic import BaseModel, Field


_CONFIG_PATH = os.getenv("CONFIG_PATH", "config.yaml")


class ServerConfig(BaseModel):
    host: str = "0.0.0.0"
    port: int = 8080
    proxy_api_key: str = "sk-plan-manage-change-me"


class DatabaseConfig(BaseModel):
    path: str = "./data/plan_manage.db"


class StorageConfig(BaseModel):
    path: str = "./data/files"


class SchedulerConfig(BaseModel):
    """调度器配置"""
    task_processing_limit: int = 5  # 每次处理的最大任务数
    loop_interval_seconds: int = 30  # 主循环间隔（秒）


class QuotaRuleSeed(BaseModel):
    """config.yaml 中单条 QuotaRule 种子"""
    rule_name: str
    quota_total: int
    quota_unit: str = "requests"
    refresh_type: str = "calendar_cycle"
    interval_hours: float | None = None
    calendar_unit: str | None = None
    calendar_anchor: dict[str, Any] | None = None


class PlanSeed(BaseModel):
    """config.yaml 中单个 Plan 种子配置"""
    name: str
    provider: str
    api_key: str = ""
    api_base: str = ""
    plan_type: str = "coding"
    supported_models: list[str] = Field(default_factory=list)
    extra_headers: dict[str, str] = Field(default_factory=dict)
    extra_config: dict[str, Any] = Field(default_factory=dict)
    quota_rules: list[QuotaRuleSeed] = Field(default_factory=list)


class AppConfig(BaseModel):
    server: ServerConfig = Field(default_factory=ServerConfig)
    database: DatabaseConfig = Field(default_factory=DatabaseConfig)
    storage: StorageConfig = Field(default_factory=StorageConfig)
    scheduler: SchedulerConfig = Field(default_factory=SchedulerConfig)
    plans: list[PlanSeed] = Field(default_factory=list)


def load_config(path: str | None = None) -> AppConfig:
    """加载配置文件，不存在则返回默认值"""
    cfg_path = Path(path or _CONFIG_PATH)
    if cfg_path.exists():
        with open(cfg_path, "r", encoding="utf-8") as f:
            raw = yaml.safe_load(f) or {}
        return AppConfig(**raw)
    return AppConfig()


# 全局单例
settings: AppConfig = load_config()