#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
配置加载器

负责加载、合并和验证配置。
"""
import json
import os
from typing import Any, Dict
from config.schema import (
    AppConfig,
    ERPConfig,
    DatabaseConfig,
    PathConfig,
    ExtractionConfig,
    ValidationConfig,
    DatabaseType,
    SQLServerConfig,
    MySQLConfig,
)
from config.defaults import DEFAULT_APP_CONFIG, DEFAULT_SETTINGS_DICT


class ConfigLoader:
    """配置加载器"""

    @staticmethod
    def load(config_file: str = "config/user_settings.json") -> AppConfig:
        """
        加载配置文件

        Args:
            config_file: 配置文件路径

        Returns:
            应用配置对象
        """
        if os.path.exists(config_file):
            try:
                with open(config_file, "r", encoding="utf-8") as f:
                    loaded_settings = json.load(f)
                # 合并默认配置和加载的配置
                merged_settings = ConfigLoader._merge_settings(
                    DEFAULT_SETTINGS_DICT, loaded_settings
                )
                return ConfigLoader._dict_to_config(merged_settings)
            except (json.JSONDecodeError, IOError) as e:
                print(f"加载配置文件失败: {e}，使用默认配置")
                return DEFAULT_APP_CONFIG
        else:
            # 首次运行，创建默认配置文件
            ConfigLoader.save(DEFAULT_APP_CONFIG, config_file)
            return DEFAULT_APP_CONFIG

    @staticmethod
    def save(config: AppConfig, config_file: str = "config/user_settings.json") -> bool:
        """
        保存配置到文件

        Args:
            config: 应用配置对象
            config_file: 配置文件路径

        Returns:
            保存是否成功
        """
        try:
            # 确保配置目录存在
            os.makedirs(os.path.dirname(config_file), exist_ok=True)

            with open(config_file, "w", encoding="utf-8") as f:
                json.dump(config.to_dict(), f, ensure_ascii=False, indent=2)
            return True
        except IOError as e:
            print(f"保存配置文件失败: {e}")
            return False

    @staticmethod
    def _merge_settings(defaults: Dict, loaded: Dict) -> Dict:
        """
        合并默认配置和加载的配置

        Args:
            defaults: 默认配置
            loaded: 加载的配置

        Returns:
            合并后的配置
        """
        result = defaults.copy()

        for key, value in loaded.items():
            if (
                key in result
                and isinstance(result[key], dict)
                and isinstance(value, dict)
            ):
                result[key] = ConfigLoader._merge_settings(result[key], value)
            else:
                result[key] = value

        return result

    @staticmethod
    def _dict_to_config(settings: Dict) -> AppConfig:
        """
        将字典转换为配置对象

        Args:
            settings: 配置字典

        Returns:
            应用配置对象
        """
        erp_dict = settings.get("erp", {})
        database_dict = settings.get("database", {})
        paths_dict = settings.get("paths", {})
        extraction_dict = settings.get("extraction", {})
        validation_dict = settings.get("validation", {})

        # 解析数据库类型
        db_type_str = database_dict.get("db_type", "sqlserver")
        try:
            db_type = DatabaseType(db_type_str)
        except ValueError:
            db_type = DatabaseType.SQLSERVER

        # 解析 SQL Server 配置
        sqlserver_dict = database_dict.get("sqlserver", {})
        sqlserver_config = SQLServerConfig(
            driver=sqlserver_dict.get("driver", "ODBC Driver 18 for SQL Server"),
            trust_server_certificate=sqlserver_dict.get("trust_server_certificate", "yes"),
        )

        # 解析 MySQL 配置
        mysql_dict = database_dict.get("mysql", {})
        mysql_config = MySQLConfig(
            host=mysql_dict.get("host", database_dict.get("server", "")),
            port=mysql_dict.get("port", 3306),
            charset=mysql_dict.get("charset", "utf8mb4"),
        )

        return AppConfig(
            erp=ERPConfig(
                url=erp_dict.get("url", ""),
                username=erp_dict.get("username", ""),
                password=erp_dict.get("password", ""),
                headless=erp_dict.get("headless", True),
                ignore_https_errors=erp_dict.get("ignore_https_errors", True),
                auto_close_browser=erp_dict.get("auto_close_browser", True),
            ),
            database=DatabaseConfig(
                db_type=db_type,
                server=database_dict.get("server", ""),
                database=database_dict.get("database", ""),
                username=database_dict.get("username", ""),
                password=database_dict.get("password", ""),
                sqlserver=sqlserver_config,
                mysql=mysql_config,
            ),
            paths=PathConfig(
                data_dir=paths_dict.get("data_dir", ""),
                production_id_file=paths_dict.get("production_id_file", ""),
                default_output=paths_dict.get(
                    "default_output", "离散备料计划维护_合并.xlsx"
                ),
                validation_output=paths_dict.get(
                    "validation_output", "物料状态校验结果.xlsx"
                ),
            ),
            extraction=ExtractionConfig(
                batch_size=extraction_dict.get("batch_size", 100),
                verbose=extraction_dict.get("verbose", True),
                auto_convert=extraction_dict.get("auto_convert", True),
                merge_batches=extraction_dict.get("merge_batches", True),
                enable_db_persistence=extraction_dict.get("enable_db_persistence", False),
            ),
            validation=ValidationConfig(
                data_source=validation_dict.get("data_source", "database_full"),
                use_database=validation_dict.get("use_database", True),
                batch_size=validation_dict.get("batch_size", 2000),
                enable_crud_operations=validation_dict.get("enable_crud_operations", False),
                default_manager=validation_dict.get("default_manager", ""),
                match_mode=validation_dict.get("match_mode", "substring"),
            ),
        )