package config

import (
	"os"
	"strconv"
	"time"

	"github.com/spf13/viper"
)

type Config struct {
	Server   ServerConfig   `mapstructure:"server"`
	Database DatabaseConfig `mapstructure:"database"`
	Speed    SpeedConfig    `mapstructure:"speed"`
	Log      LogConfig      `mapstructure:"log"`
}

type ServerConfig struct {
	Port int    `mapstructure:"port"`
	Host string `mapstructure:"host"`
}

type DatabaseConfig struct {
	Host     string `mapstructure:"host"`
	Port     int    `mapstructure:"port"`
	Username string `mapstructure:"username"`
	Password string `mapstructure:"password"`
	Database string `mapstructure:"database"`
}

type SpeedConfig struct {
	TestURLs     []string      `mapstructure:"test_urls"`
	Timeout      time.Duration `mapstructure:"timeout"`
	Concurrency  int           `mapstructure:"concurrency"`
	Interval     time.Duration `mapstructure:"interval"`
	TestOnStart  bool          `mapstructure:"test_on_start"`
}

type LogConfig struct {
	Level string `mapstructure:"level"`
	File  string `mapstructure:"file"`
}

func Load() (*Config, error) {
	// 设置默认值
	setDefaults()

	// 读取环境变量
	viper.AutomaticEnv()

	// 读取配置文件
	viper.SetConfigName("config")
	viper.SetConfigType("yaml")
	viper.AddConfigPath(".")
	viper.AddConfigPath("./config")

	if err := viper.ReadInConfig(); err != nil {
		// 如果配置文件不存在，使用默认值
		if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
			return nil, err
		}
	}

	var config Config
	if err := viper.Unmarshal(&config); err != nil {
		return nil, err
	}

	return &config, nil
}

func setDefaults() {
	// 服务器配置
	viper.SetDefault("server.port", 3000)
	viper.SetDefault("server.host", "0.0.0.0")

	// 数据库配置
	viper.SetDefault("database.host", "localhost")
	viper.SetDefault("database.port", 3306)
	viper.SetDefault("database.username", "root")
	viper.SetDefault("database.password", "")
	viper.SetDefault("database.database", "clash_speed_test")

	// 测速配置
	viper.SetDefault("speed.test_urls", []string{
		"https://www.google.com",
		"https://www.youtube.com",
		"https://www.github.com",
	})
	viper.SetDefault("speed.timeout", 10*time.Second)
	viper.SetDefault("speed.concurrency", 5)
	viper.SetDefault("speed.interval", 5*time.Minute)
	viper.SetDefault("speed.test_on_start", true)

	// 日志配置
	viper.SetDefault("log.level", "info")
	viper.SetDefault("log.file", "")

	// 环境变量覆盖
	if port := os.Getenv("PORT"); port != "" {
		if p, err := strconv.Atoi(port); err == nil {
			viper.Set("server.port", p)
		}
	}

	if dbHost := os.Getenv("DB_HOST"); dbHost != "" {
		viper.Set("database.host", dbHost)
	}

	if dbPort := os.Getenv("DB_PORT"); dbPort != "" {
		if p, err := strconv.Atoi(dbPort); err == nil {
			viper.Set("database.port", p)
		}
	}

	if dbUser := os.Getenv("DB_USER"); dbUser != "" {
		viper.Set("database.username", dbUser)
	}

	if dbPass := os.Getenv("DB_PASS"); dbPass != "" {
		viper.Set("database.password", dbPass)
	}

	if dbName := os.Getenv("DB_NAME"); dbName != "" {
		viper.Set("database.database", dbName)
	}

	if interval := os.Getenv("SPEED_TEST_INTERVAL"); interval != "" {
		if d, err := time.ParseDuration(interval); err == nil {
			viper.Set("speed.interval", d)
		}
	}

	if timeout := os.Getenv("SPEED_TEST_TIMEOUT"); timeout != "" {
		if d, err := time.ParseDuration(timeout); err == nil {
			viper.Set("speed.timeout", d)
		}
	}
}