package main

import (
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"

	apiv1 "git.ar21.de/yolokube/country-geo-locations/api/v1"
	"git.ar21.de/yolokube/country-geo-locations/cfg"
	"git.ar21.de/yolokube/country-geo-locations/internal/cache"
	csvimporter "git.ar21.de/yolokube/country-geo-locations/internal/csv_importer"
	"git.ar21.de/yolokube/country-geo-locations/internal/database"
	"git.ar21.de/yolokube/country-geo-locations/internal/downloader"
	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/go-chi/render"
)

func main() {
	cli := cfg.CLI{}
	appSettings, err := cli.Parse()
	if err != nil {
		log.Fatal(err)
	}

	handleGracefulShutdown()

	ctx := downloader.NewContext(appSettings.DataFile, appSettings.DataURL)
	if !ctx.FileExists() {
		if downloadErr := ctx.Download(); downloadErr != nil {
			log.Fatal(downloadErr)
		}
		log.Printf("saved file to %s\n", ctx.Filename)
	}

	db, err := database.NewDatabase()
	if err != nil {
		log.Fatal("database creation failed", err)
	}

	log.Println("importing data from file", appSettings.DataFile)
	err = csvimporter.ImportCSV(appSettings.DataFile, db)
	if err != nil {
		log.Fatal("data Import from file failed", err)
	}
	log.Println("imported data from file successful")

	cache := cache.NewCache(appSettings.CacheTTL)
	lh := apiv1.NewLocationHandler(cache, db)

	r := chi.NewRouter()
	r.Use(middleware.RequestID)
	r.Use(middleware.Logger)
	r.Use(middleware.Recoverer)
	r.Use(render.SetContentType(render.ContentTypeJSON))

	r.Mount("/api/v1", apiv1.NewRouter(lh))

	server := &http.Server{
		Addr:              appSettings.ServerAddress,
		Handler:           r,
		ReadHeaderTimeout: appSettings.ReadHeaderTimeout,
	}

	log.Println("starting server at", server.Addr)
	if err = server.ListenAndServe(); err != nil {
		log.Panic(err)
	}
}

func handleGracefulShutdown() {
	var signals = make(chan os.Signal, 1)

	signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT)

	go func() {
		sig := <-signals
		log.Printf("caught signal: %+v", sig)
		os.Exit(0)
	}()
}