"""
配置文件
支持YAML配置和.env环境变量
"""
import os
from typing import Any, Dict, List, Optional
from urllib.parse import urlparse

import yaml
from dotenv import load_dotenv

# 加载环境变量
load_dotenv()

# 配置文件路径
CONFIG_FILE = os.getenv("CONFIG_FILE", "config.yaml")


def _validate_url(url: str, field_name: str) -> None:
    """验证URL格式"""
    if not url:
        raise ValueError(f"环境变量 {field_name} 未设置")
    
    parsed = urlparse(url)
    if not all([parsed.scheme, parsed.netloc]):
        raise ValueError(f"{field_name} 格式不正确: {url}")


def _load_yaml_config() -> Optional[Dict[str, Any]]:
    """加载YAML配置文件"""
    if os.path.exists(CONFIG_FILE):
        with open(CONFIG_FILE, 'r', encoding='utf-8') as f:
            return yaml.safe_load(f)
    return None


def _get_config_value(
    yaml_config: Optional[Dict[str, Any]],
    env_key: str,
    yaml_path: List[str],
    default: Any = None,
    validator: Optional[callable] = None
) -> Any:
    """获取配置值，优先级：环境变量 > YAML配置 > 默认值"""
    # 1. 优先从环境变量获取
    env_value = os.getenv(env_key)
    if env_value is not None:
        return env_value
    
    # 2. 其次从YAML配置获取
    if yaml_config:
        value = yaml_config
        for key in yaml_path:
            if isinstance(value, dict) and key in value:
                value = value[key]
            else:
                value = None
                break
        
        if value is not None:
            if validator:
                validator(value)
            return value
    
    # 3. 使用默认值
    return default


def _get_int_value(yaml_config: Optional[Dict[str, Any]], env_key: str, yaml_path: List[str], default: int) -> int:
    """获取整数配置值"""
    value = _get_config_value(yaml_config, env_key, yaml_path, str(default))
    try:
        return int(value)
    except (ValueError, TypeError):
        return default


def _get_bool_value(yaml_config: Optional[Dict[str, Any]], env_key: str, yaml_path: List[str], default: bool) -> bool:
    """获取布尔配置值"""
    value = _get_config_value(yaml_config, env_key, yaml_path, str(default).lower())
    
    # 如果值已经是布尔类型，直接返回
    if isinstance(value, bool):
        return value
    
    # 如果是字符串，转换为布尔值
    if isinstance(value, str):
        return value.lower() == "true"
    
    # 其他类型转换为布尔值
    return bool(value)


# 加载YAML配置
yaml_config = _load_yaml_config()

# 验证并获取BASE_URL
BASE_URL = os.getenv("BASE_URL")
if BASE_URL is None and yaml_config:
    BASE_URL = _get_config_value(yaml_config, "BASE_URL", ["camera", "base_url"])
_validate_url(BASE_URL, "BASE_URL")

CAMERA_URL = f"{BASE_URL}/adaops/blank-layout/camera-view"

# 摄像头配置
def _load_cameras() -> List[Dict[str, Any]]:
    """加载摄像头配置"""
    if yaml_config and "cameras" in yaml_config:
        cameras = yaml_config["cameras"]
        # 如果cameras中没有url字段，自动生成
        for camera in cameras:
            if 'url' not in camera:
                room = camera.get('room', '')
                cam = camera.get('camera', 'mixed')
                camera['url'] = f"{CAMERA_URL}?room={room}&camera={cam}"
        return cameras
    
    # 硬编码后备配置（不推荐使用）
    return [
        {
            'id': 1,
            'room': 'cnfzhjyg-igv-251',
            'camera': 'mixed',
            'name': '1号车',
            'url': f"{CAMERA_URL}?room=cnfzhjyg-igv-251&camera=mixed"
        },
        {
            'id': 2,
            'room': 'cnfzhjyg-igv-2',
            'camera': 'mixed',
            'name': '2号车',
            'url': f"{CAMERA_URL}?room=cnfzhjyg-igv-2&camera=mixed"
        },
        {
            'id': 3,
            'room': 'cnfzhjyg-igv-3',
            'camera': 'mixed',
            'name': '3号车',
            'url': f"{CAMERA_URL}?room=cnfzhjyg-igv-3&camera=mixed"
        },
        {
            'id': 4,
            'room': 'cnfzhjyg-igv-5',
            'camera': 'mixed',
            'name': '5号车',
            'url': f"{CAMERA_URL}?room=cnfzhjyg-igv-5&camera=mixed"
        },
        {
            'id': 5,
            'room': 'cnfzhjyg-igv-6',
            'camera': 'mixed',
            'name': '6号车',
            'url': f"{CAMERA_URL}?room=cnfzhjyg-igv-6&camera=mixed"
        },
        {
            'id': 6,
            'room': 'cnfzhjyg-igv-7',
            'camera': 'mixed',
            'name': '7号车',
            'url': f"{CAMERA_URL}?room=cnfzhjyg-igv-7&camera=mixed"
        }
    ]


CAMERAS: List[Dict[str, Any]] = _load_cameras()

# Flask配置
DEBUG: bool = _get_bool_value(yaml_config, "FLASK_DEBUG", ["app", "debug"], False)
PORT: int = _get_int_value(yaml_config, "PORT", ["app", "port"], 5000)
HOST: str = _get_config_value(yaml_config, "HOST", ["app", "host"], "0.0.0.0")

# 验证HOST
if not HOST:
    raise ValueError("环境变量 HOST 未设置")

# 日志配置
LOG_LEVEL: str = _get_config_value(yaml_config, "LOG_LEVEL", ["logging", "level"], "INFO")
LOG_FILE: str = _get_config_value(yaml_config, "LOG_FILE", ["logging", "file"], "logs/multi_camera.log")
LOG_MAX_BYTES: int = _get_int_value(yaml_config, "LOG_MAX_BYTES", ["logging", "max_bytes"], 10485760)
LOG_BACKUP_COUNT: int = _get_int_value(yaml_config, "LOG_BACKUP_COUNT", ["logging", "backup_count"], 10)