package services

import (
	"encoding/json"
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/pkg/errors"
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
	"nginx-tail/domain/po"
	"os"
)

type DbConfig struct {
	DbAddr   string `json:"dbAddr"`
	DbPort   int    `json:"dbPort"`
	DbSchema string `json:"dbSchema"`
	UserName string `json:"userName"`
	Password string `json:"password"`
}

type AppConfig struct {
	LocalPort   int       `json:"localPort"`
	LogFilePath string    `json:"logFilePath,omitempty"`
	DbCfg       *DbConfig `json:"dbCfg"`
}

var (
	appCfgInstance *AppConfig
	dbInstance     *gorm.DB
)

func LoadAppConfig(cfgFilePath string) error {
	if data, err := os.ReadFile(cfgFilePath); err != nil {
		return errors.Wrapf(err, "try open config file '%s' fail", cfgFilePath)
	} else {
		appCfg := &AppConfig{}
		if err = json.Unmarshal(data, appCfg); err != nil {
			return errors.Wrapf(err, "try parse config file '%s' fail", cfgFilePath)
		} else {
			if appCfg.LogFilePath == "" {
				appCfg.LogFilePath = "/var/log/nginx/access.log"
			}

			if err = initDb(appCfg.DbCfg); err != nil {
				return errors.Wrapf(err, "try init db fail")
			}
			appCfgInstance = appCfg
		}
	}

	return nil
}

func StartCliService() {
	go TailFile(appCfgInstance.LogFilePath, 5)

	g := gin.Default()
	g.GET("/", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"code": 0,
			"msg":  "ok",
		})
	})

	if err := g.Run(fmt.Sprintf(":%d", appCfgInstance.LocalPort)); err != nil {
		panic(err)
	}
}

func GetDb() *gorm.DB {
	return dbInstance
}

func initDb(cfg *DbConfig) error {
	if cfg == nil {
		return errors.New("can not init db by nil config")
	}

	dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Local",
		cfg.UserName, cfg.Password, cfg.DbAddr, cfg.DbPort, cfg.DbSchema)

	if db, err := gorm.Open(mysql.Open(dsn),
		&gorm.Config{Logger: logger.Default.LogMode(logger.Warn)}); err != nil {
		return errors.Wrap(err, "try open db fail")
	} else {
		if err = autoMigrateObjects(db); err != nil {
			return errors.Wrap(err, "try auto migrate objects fail")
		}
		dbInstance = db
	}

	return nil
}

func autoMigrateObjects(db *gorm.DB) error {
	return db.AutoMigrate(&po.NginxAccessLog{})
}