package main

import (
	"fmt"
	"os"
	"time"

	"github.com/getkin/kin-openapi/openapi3"
	"github.com/getkin/kin-openapi/openapi3filter"
	"github.com/labstack/echo-contrib/echoprometheus"
	"github.com/labstack/echo-contrib/session"
	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	oapiMiddleware "github.com/oapi-codegen/echo-middleware"
	"github.com/spf13/afero"
	"github.com/wader/gormstore/v2"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"

	"gitrepo.ru/neonxp/nquest/api"
	appmiddleware "gitrepo.ru/neonxp/nquest/pkg/contextlib"
	"gitrepo.ru/neonxp/nquest/pkg/controller"

	"gitrepo.ru/neonxp/nquest/pkg/models"
	"gitrepo.ru/neonxp/nquest/pkg/service"
)

var Version = "dev"

func main() {
	cfg, err := GetConfig()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error loading config\n: %s", err)
		os.Exit(1)
	}

	db, err := gorm.Open(postgres.Open(cfg.DSN()), &gorm.Config{})
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error DB connection\n: %s", err)
		os.Exit(1)
	}

	if err := db.AutoMigrate(
		&models.User{},
		&models.Game{},
		&models.GameCursor{},
		&models.Task{},
		&models.Code{},
		&models.File{},
	); err != nil {
		fmt.Fprintf(os.Stderr, "Error DB migration\n: %s", err)
		os.Exit(1)
	}

	storageFs := afero.NewOsFs()
	storage := afero.NewBasePathFs(storageFs, "store")

	// --[ Services ]--
	userService := service.NewUser(db)
	gameService := service.NewGame(db)
	engineService := service.NewEngine(db)
	uploadService := service.NewFile(db, storage)

	// --[ HTTP server ]--

	e := echo.New()
	e.Debug = true
	store := gormstore.New(db, []byte(cfg.Secret))

	quit := make(chan struct{})
	defer func() {
		close(quit)
	}()
	go store.PeriodicCleanup(12*time.Hour, quit)

	swagger, err := api.GetSwagger()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error loading swagger spec\n: %s", err)
		os.Exit(1)
	}

	swagger.Servers = []*openapi3.Server{{URL: "/api", Description: "Needed to match path"}}

	e.Use(
		middleware.Recover(),
		middleware.RequestID(),
		session.Middleware(store),
		middleware.Logger(),
		middleware.RateLimiter(middleware.NewRateLimiterMemoryStore(20)),
		middleware.Gzip(),
		echoprometheus.NewMiddleware("nquest"),
		appmiddleware.User(userService),
	)

	// --[ Router ]--
	handler := serverRouter{
		Game: &controller.Game{
			GameService: gameService,
		},
		User: &controller.User{
			UserService: userService,
		},
		Engine: &controller.Engine{
			GameService:   gameService,
			EngineService: engineService,
		},
		Admin: &controller.Admin{
			GameService: gameService,
		},
		File: &controller.File{
			FileService: uploadService,
		},
	}
	codegen := e.Group("")

	codegen.Use(
		oapiMiddleware.OapiRequestValidatorWithOptions(
			swagger,
			&oapiMiddleware.Options{
				Options: openapi3filter.Options{
					AuthenticationFunc: authFunc,
				},
				SilenceServersWarning: true,
			},
		),
	)

	api.RegisterHandlersWithBaseURL(codegen, handler, "/api")

	// --[ System ]--
	e.GET("/metrics", echoprometheus.NewHandler())

	e.StaticFS("/file", afero.NewIOFS(storage))
	e.StaticFS("/*", distDirFS)

	e.Logger.Debugf("backend version %s", Version)
	e.Logger.Fatal(e.Start(cfg.Listen))
}

type serverRouter struct {
	*controller.Game
	*controller.User
	*controller.Engine
	*controller.Admin
	*controller.File
}