package handlers

import (
	"context"
	"fmt"
	"net/http"

	"git.haelnorr.com/h/golib/hws"
	"github.com/pkg/errors"
	"github.com/uptrace/bun"

	"git.haelnorr.com/h/oslstats/internal/auditlog"
	"git.haelnorr.com/h/oslstats/internal/db"
	"git.haelnorr.com/h/oslstats/internal/notify"
	"git.haelnorr.com/h/oslstats/internal/validation"
	leaguesview "git.haelnorr.com/h/oslstats/internal/view/leaguesview"
)

func NewLeague(
	s *hws.Server,
	conn *bun.DB,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method == "GET" {
			renderSafely(leaguesview.NewPage(), s, r, w)
			return
		}
	})
}

func NewLeagueSubmit(
	s *hws.Server,
	conn *bun.DB,
	audit *auditlog.Logger,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		getter, ok := validation.ParseFormOrNotify(s, w, r)
		if !ok {
			return
		}
		name := getter.String("name").
			TrimSpace().Required().
			MaxLength(50).MinLength(3).Value
		shortname := getter.String("short_name").
			TrimSpace().Required().
			MaxLength(10).MinLength(2).Value
		description := getter.String("description").
			TrimSpace().MaxLength(500).Value
		if !getter.ValidateAndNotify(s, w, r) {
			return
		}

		nameUnique := false
		shortNameUnique := false
		var league *db.League
		if ok := db.WithNotifyTx(s, w, r, conn, func(ctx context.Context, tx bun.Tx) (bool, error) {
			var err error
			nameUnique, err = db.IsUnique(ctx, tx, (*db.League)(nil), "name", name)
			if err != nil {
				return false, errors.Wrap(err, "db.IsLeagueNameUnique")
			}
			shortNameUnique, err = db.IsUnique(ctx, tx, (*db.League)(nil), "short_name", shortname)
			if err != nil {
				return false, errors.Wrap(err, "db.IsLeagueShortNameUnique")
			}
			if !nameUnique || !shortNameUnique {
				return true, nil
			}
			league = &db.League{
				Name:        name,
				ShortName:   shortname,
				Description: description,
			}
			err = db.Insert(tx, league).WithAudit(r, audit.Callback()).Exec(ctx)
			if err != nil {
				return false, errors.Wrap(err, "db.Insert")
			}
			return true, nil
		}); !ok {
			return
		}

		if !nameUnique {
			notify.Warn(s, w, r, "Duplicate Name", "This league name is already taken.", nil)
			return
		}

		if !shortNameUnique {
			notify.Warn(s, w, r, "Duplicate Short Name", "This short name is already taken.", nil)
			return
		}
		w.Header().Set("HX-Redirect", fmt.Sprintf("/leagues/%s", league.ShortName))
		w.WriteHeader(http.StatusOK)
		notify.SuccessWithDelay(s, w, r, "League Created", fmt.Sprintf("Successfully created league: %s", name), nil)
	})
}