package main

import (
	"context"
	"embed"
	"flag"
	"log"
	"net/http"
	"os"
	"time"

	"github.com/jmoiron/sqlx"
	bolt "go.etcd.io/bbolt"
	"modernc.org/ql"
	_ "modernc.org/ql/driver"

	"git.c3pb.de/gbe/invinoveritas/auth"
)

//go:embed templates/*.tpl
var templateFS embed.FS

//go:embed static/*
var staticFS embed.FS

func httpError(w http.ResponseWriter, msg string, err error, status int) {
	if err != nil {
		msg += ": " + err.Error()
	}

	log.Println(msg)

	http.Error(w, msg, status)
}

type Handler struct {
	db *bolt.DB
	ap authProvider
}

func logRequest(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		defer func() {
			d := time.Since(start)

			log.Println("handled", r.Method, r.URL, "from", r.RemoteAddr, "by", auth.Get(r), "in", d)
		}()

		next.ServeHTTP(w, r)
	})
}

func openQLdb(path string) (*sqlx.DB, error) {
	var retried bool

	path += ".ql"

retry:
	db, err := sqlx.Open("ql2", path)
	if err != nil {
		return nil, err
	}

	log.Println("running test-select on db")
	_, err = db.Exec(`SELECT count(*) FROM __Table`)
	if err != nil && !retried {
		log.Println("got err:", err)
		retried = true

		// WAL may be corrupted. Manually remove it and re-try open. See
		// https://gitlab.com/cznic/ql/-/issues/227 for more info.
		err := os.Remove(ql.WalName(path))
		if err != nil {
			return nil, err
		}

		goto retry
	}

	if err != nil {
		return nil, err
	}

	return db, nil
}

func main() {
	dbPath := flag.String("db", "vino", "Path to database file")
	listenAddr := flag.String("listen", "127.0.0.1:7878", "Listening address")
	flag.Parse()

	sqlDB, err := openQLdb(*dbPath)
	if err != nil {
		log.Fatalln("can't open DB:", err)
	}
	defer sqlDB.Close()

	db, err := bolt.Open(*dbPath+".db", 0644, nil)
	if err != nil {
		log.Fatalln("can't open DB:", err)
	}
	defer db.Close()

	err = initSQLdb(context.TODO(), sqlDB)
	if err != nil {
		log.Fatalln("can't initalize DB:", err, ql.WalName(*dbPath+".ql"))
	}

	err = initBoltDB(db)
	if err != nil {
		log.Fatalln("can't initialize DB:", err)
	}

	err = migrateBoltToQL(context.TODO(), db, sqlDB)
	if err != nil {
		log.Fatalln("can't migrate bolt to sql db:", err)
	}

	http.HandleFunc("/favicon.ico", http.NotFound)

	http.Handle("/static/", logRequest(http.FileServer(http.FS(staticFS))))

	ap := authProvider{
		db: sqlDB,
	}

	handler := Handler{
		db: db,
		ap: ap,
	}

	http.Handle("/details/img", auth.Require(logRequest(handler.img()), ap))
	http.Handle("/details/", auth.Require(logRequest(handler.details()), ap))
	http.Handle("/user/", auth.Require(logRequest(handler.user()), ap))
	http.Handle("/", auth.Require(logRequest(handler.index()), ap))

	log.Printf("here we go, listening on http://%s", *listenAddr)

	err = http.ListenAndServe(*listenAddr, nil)
	if err != nil {
		log.Fatalln("http handler failed:", err)
	}
}