package handlers

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

	"git.haelnorr.com/h/golib/hws"
	"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/permissions"
	"git.haelnorr.com/h/oslstats/internal/validation"
	seasonsview "git.haelnorr.com/h/oslstats/internal/view/seasonsview"
	"git.haelnorr.com/h/timefmt"
	"github.com/pkg/errors"
	"github.com/uptrace/bun"
)

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

func NewSeasonSubmit(
	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(20).MinLength(5).Value
		shortName := getter.String("short_name").
			TrimSpace().ToUpper().Required().
			MaxLength(6).MinLength(2).Value
		format := timefmt.NewBuilder().
			DayNumeric2().Slash().
			MonthNumeric2().Slash().
			Year4().Build()
		startDate := getter.Time("start_date", format).Required().Value
		if !getter.ValidateAndNotify(s, w, r) {
			return
		}

		nameUnique := false
		shortNameUnique := false
		var season *db.Season
		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.Season)(nil), "name", name)
			if err != nil {
				return false, errors.Wrap(err, "db.IsSeasonNameUnique")
			}
			shortNameUnique, err = db.IsUnique(ctx, tx, (*db.Season)(nil), "short_name", shortName)
			if err != nil {
				return false, errors.Wrap(err, "db.IsSeasonShortNameUnique")
			}
			if !nameUnique || !shortNameUnique {
				return true, nil
			}
			season, err = db.NewSeason(ctx, tx, name, shortName, startDate)
			if err != nil {
				return false, errors.Wrap(err, "db.NewSeason")
			}
			user := db.CurrentUser(ctx)
			err = audit.LogSuccess(ctx, tx, user, permissions.SeasonsCreate.String(),
				"season", season.ID, nil, r)
			if err != nil {
				return false, errors.Wrap(err, "audit.LogSuccess")
			}
			return true, nil
		}); !ok {
			return
		}

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

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