package api

import (
	"context"
	"log"
	"math/rand"
	"net/http"
	"os"
	"os/signal"
	"time"

	"github.com/gin-gonic/gin"
	gomysql "github.com/go-sql-driver/mysql"
	"gorm.io/gorm"
	gormlogger "gorm.io/gorm/logger"
)

type Service struct {
	Gin        *gin.Engine
	DB         *gorm.DB
	Config     *ServiceConfig
	Logger     *log.Logger
	GormLogger gormlogger.Interface
}

type ServiceConfig struct {
	Listen string
	Mysql  *gomysql.Config
}

func New(logger *log.Logger, config *ServiceConfig) *Service {
	return &Service{
		Gin:    gin.New(),
		Config: config,
		Logger: logger,
		GormLogger: gormlogger.New(
			log.New(os.Stdout, "\r\n", log.LstdFlags), // io writer
			gormlogger.Config{
				SlowThreshold:             time.Second,      // Slow SQL threshold
				LogLevel:                  gormlogger.Error, // Log level
				IgnoreRecordNotFoundError: true,             // Ignore ErrRecordNotFound error for logger
				Colorful:                  true,             // Disable color
			},
		),
	}
}

func (s *Service) SetupRoutes() {
	s.Gin.Use(gin.Logger())
	s.Gin.Use(s.Recovery)
	s.Gin.NoRoute(func(c *gin.Context) {
		c.JSON(http.StatusNotFound, gin.H{
			"error": "this route doesn't exists",
		})
	})

}

func (s *Service) Run() error {
	rand.Seed(time.Now().UnixNano())
	s.SetupRoutes()
	s.SetupDB()

	srv := &http.Server{
		Addr:    s.Config.Listen,
		Handler: s.Gin,
	}

	quit := make(chan os.Signal, 1)
	var runError error
	go func() {
		// service connections
		if runError = srv.ListenAndServe(); runError != nil {
			quit <- os.Interrupt
		}
	}()

	// Wait for interrupt signal to gracefully shutdown the server with
	// a timeout of 5 seconds.
	signal.Notify(quit, os.Interrupt)
	<-quit
	s.Logger.Println("shutdown ...")

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := srv.Shutdown(ctx); err != nil {
		return err
	}

	db, err := s.DB.DB()
	if err != nil {
		return err
	}
	s.Logger.Println("closing database ...")
	if err := db.Close(); err != nil {
		return err
	}

	s.Logger.Println("exiting")
	return runError
}