package config

import (
	"log"
	"github.com/spf13/viper"
)

// Config 应用配置结构
type Config struct {
	Server   ServerConfig   `mapstructure:"server"`
	Database DatabaseConfig `mapstructure:"database"`
	Redis    RedisConfig    `mapstructure:"redis"`
	JWT      JWTConfig      `mapstructure:"jwt"`
	Upload   UploadConfig   `mapstructure:"upload"`
	Log      LogConfig      `mapstructure:"log"`
}

// ServerConfig 服务器配置
type ServerConfig struct {
	Port         string `mapstructure:"port"`
	Mode         string `mapstructure:"mode"`
	ReadTimeout  int    `mapstructure:"read_timeout"`
	WriteTimeout int    `mapstructure:"write_timeout"`
}

// DatabaseConfig 数据库配置
type DatabaseConfig struct {
	Host            string `mapstructure:"host"`
	Port            string `mapstructure:"port"`
	User            string `mapstructure:"user"`
	Password        string `mapstructure:"password"`
	DBName          string `mapstructure:"dbname"`
	MaxOpenConns    int    `mapstructure:"max_open_conns"`
	MaxIdleConns    int    `mapstructure:"max_idle_conns"`
	ConnMaxLifetime int    `mapstructure:"conn_max_lifetime"`
}

// RedisConfig Redis配置
type RedisConfig struct {
	Host     string `mapstructure:"host"`
	Port     string `mapstructure:"port"`
	Password string `mapstructure:"password"`
	DB       int    `mapstructure:"db"`
	PoolSize int    `mapstructure:"pool_size"`
}

// JWTConfig JWT配置
type JWTConfig struct {
	Secret string `mapstructure:"secret"`
	Expire int    `mapstructure:"expire"`
}

// UploadConfig 文件上传配置
type UploadConfig struct {
	Path         string   `mapstructure:"path"`
	MaxSize      int      `mapstructure:"max_size"`
	AllowedTypes []string `mapstructure:"allowed_types"`
}

// LogConfig 日志配置
type LogConfig struct {
	Level      string `mapstructure:"level"`
	Output     string `mapstructure:"output"`
	MaxSize    int    `mapstructure:"max_size"`
	MaxBackups int    `mapstructure:"max_backups"`
	MaxAge     int    `mapstructure:"max_age"`
}

// LoadConfig 加载配置文件
func LoadConfig(configPath string) (*Config, error) {
	viper.SetConfigFile(configPath)
	viper.SetConfigType("yaml")

	// 设置默认值
	setDefaults()

	// 环境变量覆盖
	viper.AutomaticEnv()

	if err := viper.ReadInConfig(); err != nil {
		log.Printf("Error reading config file: %v", err)
		return nil, err
	}

	var config Config
	if err := viper.Unmarshal(&config); err != nil {
		log.Printf("Error unmarshaling config: %v", err)
		return nil, err
	}

	return &config, nil
}

// setDefaults 设置默认配置值
func setDefaults() {
	// 服务器默认配置
	viper.SetDefault("server.port", "8080")
	viper.SetDefault("server.mode", "debug")
	viper.SetDefault("server.read_timeout", 60)
	viper.SetDefault("server.write_timeout", 60)

	// 数据库默认配置
	viper.SetDefault("database.host", "localhost")
	viper.SetDefault("database.port", "3306")
	viper.SetDefault("database.user", "root")
	viper.SetDefault("database.password", "password")
	viper.SetDefault("database.dbname", "web_training")
	viper.SetDefault("database.max_open_conns", 100)
	viper.SetDefault("database.max_idle_conns", 10)
	viper.SetDefault("database.conn_max_lifetime", 3600)

	// Redis默认配置
	viper.SetDefault("redis.host", "localhost")
	viper.SetDefault("redis.port", "6379")
	viper.SetDefault("redis.password", "")
	viper.SetDefault("redis.db", 0)
	viper.SetDefault("redis.pool_size", 10)

	// JWT默认配置
	viper.SetDefault("jwt.secret", "your-secret-key")
	viper.SetDefault("jwt.expire", 86400)

	// 上传默认配置
	viper.SetDefault("upload.path", "./uploads")
	viper.SetDefault("upload.max_size", 10)
	viper.SetDefault("upload.allowed_types", []string{"jpg", "jpeg", "png", "gif"})

	// 日志默认配置
	viper.SetDefault("log.level", "info")
	viper.SetDefault("log.output", "logs/app.log")
	viper.SetDefault("log.max_size", 100)
	viper.SetDefault("log.max_backups", 3)
	viper.SetDefault("log.max_age", 28)
}