package settings

import (
	"fmt"

	"github.com/fsnotify/fsnotify"
	"github.com/spf13/viper"
)

var Conf = new(AppConfig) // 从该对象访问数据

type AppConfig struct {
	Mode         string `mapstructure:"mode"`
	Port         int    `mapstructure:"port"`
	*LogConfig   `mapstructure:"log"`
	*MySQLConfig `mapstructure:"mysql"`
	*RedisConfig `mapstructure:"redis"`
}

type MySQLConfig struct {
	Host         string `mapstructure:"host"`
	User         string `mapstructure:"user"`
	Password     string `mapstructure:"password"`
	DB           string `mapstructure:"db"`
	Port         int    `mapstructure:"port"`
	MaxOpenConns int    `mapstructure:"max_open_conns"`
	MaxIdleConns int    `mapstructure:"max_idle_conns"`
}

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

type LogConfig struct {
	Level      string `mapstructure:"level"`
	Filename   string `mapstructure:"filename"`
	MaxSize    int    `mapstructure:"max_size"`
	MaxAge     int    `mapstructure:"max_age"`
	MaxBackups int    `mapstructure:"max_backups"`
}

// Init mapstructure的作用：
// 正常处理过程是将json/yaml等二进制数据转化成map之后，再转化成struct对象。
// 通过mapstructure可以直接将json/yaml等二进制数据转化成struct对象。
func Init() error {
	viper.SetConfigFile("./conf/config.yaml")
	viper.WatchConfig() // 监控配置文件变化
	viper.OnConfigChange(func(e fsnotify.Event) {
		fmt.Println("配置文件变化:", e.Name)
		viper.Unmarshal(&Conf)
	})

	err := viper.ReadInConfig()
	if err != nil {
		panic(fmt.Errorf("ReadInConfig failed, err: %v", err))
	}
	if err := viper.Unmarshal(&Conf); err != nil {
		panic(fmt.Errorf("unmarshal failed, err: %v", err))
	}
	return err
}