package model

import (
	"fmt"
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
	"os"
	"strconv"
)

var DB *gorm.DB

func Init() {
	var err error

	host := os.Getenv("MYSQL_HOST")
	if host == "" {
		host = "localhost"
	}

	portStr := os.Getenv("MYSQL_PORT")
	var port int
	if portStr == "" {
		port = 3306
	} else {
		port, err = strconv.Atoi(portStr)
		if err != nil {
			panic(fmt.Sprintf("Invalid MYSQL_PORT environment variable: %s", portStr))
		}
	}

	username := os.Getenv("MYSQL_USERNAME")
	if username == "" {
		panic("MYSQL_USERNAME environment variable is not set")
	}

	password := os.Getenv("MYSQL_PASSWORD")
	if password == "" {
		panic("MYSQL_PASSWORD environment variable is not set")
	}

	database := os.Getenv("MYSQL_DATABASE")
	if database == "" {
		panic("MYSQL_DATABASE environment variable is not set")
	}

	dsn := fmt.Sprintf(
		"%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Local",
		username, password, host, port, database,
	)
	DB, err = gorm.Open(mysql.Open(dsn), &gorm.Config{})
	if err != nil {
		panic(err)
	}
}