package main

import (
	"context"
	"fmt"
	"nyanimedb-server/api"
	"nyanimedb-server/db"
	"os"
	"reflect"
	"time"

	"github.com/gin-contrib/cors"
	"github.com/gin-gonic/gin"
	"github.com/jackc/pgx/v5"
	"github.com/pelletier/go-toml/v2"
)

var AppConfig Config

func main() {
	// if len(os.Args) != 2 {
	// 	AppConfig.Mode = "env"
	// } else {
	// 	AppConfig.Mode = "argv"
	// }

	// err := InitConfig()
	// if err != nil {
	// 	log.Fatalf("Failed to init config: %v\n", err)
	// }

	conn, err := pgx.Connect(context.Background(), os.Getenv("DATABASE_URL"))
	if err != nil {
		fmt.Fprintf(os.Stderr, "Unable to connect to database: %v\n", err)
		os.Exit(1)
	}

	defer conn.Close(context.Background())

	r := gin.Default()

	queries := db.New(conn)

	server := api.NewServer(queries)
	// r.LoadHTMLGlob("templates/*")

	r.Use(cors.New(cors.Config{
		AllowOrigins:     []string{"*"}, // allow all origins, change to specific domains in production
		AllowMethods:     []string{"GET", "POST", "PUT", "DELETE"},
		AllowHeaders:     []string{"Origin", "Content-Type", "Accept"},
		ExposeHeaders:    []string{"Content-Length"},
		AllowCredentials: true,
		MaxAge:           12 * time.Hour,
	}))

	api.RegisterHandlers(r, api.NewStrictHandler(
		server,
		// сюда можно добавить middlewares, если нужно
		[]api.StrictMiddlewareFunc{},
	))
	// r.GET("/", func(c *gin.Context) {
	// 	c.HTML(http.StatusOK, "index.html", gin.H{
	// 		"title":   "Welcome Page",
	// 		"message": "Hello, Gin with HTML templates!",
	// 	})
	// })

	// r.GET("/api", func(c *gin.Context) {
	// 	items := []Item{
	// 		{ID: 1, Title: "First Item", Description: "This is the description of the first item."},
	// 		{ID: 2, Title: "Second Item", Description: "This is the description of the second item."},
	// 		{ID: 3, Title: "Third Item", Description: "This is the description of the third item."},
	// 	}

	// 	c.JSON(http.StatusOK, items)
	// })

	r.Run(":8080")
}

func InitConfig() error {
	if AppConfig.Mode == "argv" {
		content, err := os.ReadFile(os.Args[1])
		if err != nil {
			return err
		}

		toml.Unmarshal(content, &AppConfig)

		fmt.Printf("%+v\n", AppConfig)

		return nil
	} else if AppConfig.Mode == "env" {
		f := reflect.ValueOf(AppConfig)

		for i := 0; i < f.NumField(); i++ {
			field := f.Type().Field(i)
			tag := field.Tag
			env_var := tag.Get("env")
			fmt.Printf("Field: %v.\nEnvironment variable: %v.\n", field.Name, env_var)
			if env_var != "" {
				env_value, exists := os.LookupEnv(env_var)
				if !exists {
					return fmt.Errorf("there is no env variable %s", env_var)
				}
				err := setField(&AppConfig, field.Name, env_value)
				if err != nil {
					return fmt.Errorf("failed to set config field %s: %v", field.Name, err)
				}
			}
		}

		return nil
	} else {
		return fmt.Errorf("incorrect config mode")
	}
}