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

func SeasonEditPage(
	s *hws.Server,
	conn *bun.DB,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		seasonStr := r.PathValue("season_short_name")
		var season *db.Season
		if ok := db.WithReadTx(s, w, r, conn, func(ctx context.Context, tx bun.Tx) (bool, error) {
			var err error
			season, err = db.GetSeason(ctx, tx, seasonStr)
			if err != nil {
				return false, errors.Wrap(err, "db.GetSeason")
			}
			return true, nil
		}); !ok {
			return
		}
		if season == nil {
			throw.NotFound(s, w, r, r.URL.Path)
			return
		}
		renderSafely(seasonsview.EditPage(season), s, r, w)
	})
}

func SeasonEditSubmit(
	s *hws.Server,
	conn *bun.DB,
	audit *auditlog.Logger,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		seasonStr := r.PathValue("season_short_name")

		getter, ok := validation.ParseFormOrNotify(s, w, r)
		if !ok {
			return
		}

		format := timefmt.NewBuilder().
			DayNumeric2().Slash().
			MonthNumeric2().Slash().
			Year4().Build()

		startDate := getter.Time("start_date", format).Required().Value
		endDate := getter.Time("end_date", format).Value
		finalsStartDate := getter.Time("finals_start_date", format).Value
		finalsEndDate := getter.Time("finals_end_date", format).Value

		if !getter.ValidateAndNotify(s, w, r) {
			return
		}

		var season *db.Season
		if ok := db.WithNotifyTx(s, w, r, conn, func(ctx context.Context, tx bun.Tx) (bool, error) {
			var err error
			season, err = db.GetSeason(ctx, tx, seasonStr)
			if err != nil {
				return false, errors.Wrap(err, "db.GetSeason")
			}
			if season == nil {
				return true, nil
			}

			// Update only the date fields
			season.StartDate = startDate
			if !endDate.IsZero() {
				season.EndDate = bun.NullTime{Time: endDate}
			} else {
				season.EndDate = bun.NullTime{}
			}
			if !finalsStartDate.IsZero() {
				season.FinalsStartDate = bun.NullTime{Time: finalsStartDate}
			} else {
				season.FinalsStartDate = bun.NullTime{}
			}
			if !finalsEndDate.IsZero() {
				season.FinalsEndDate = bun.NullTime{Time: finalsEndDate}
			} else {
				season.FinalsEndDate = bun.NullTime{}
			}

			err = db.UpdateSeason(ctx, tx, season)
			if err != nil {
				return false, errors.Wrap(err, "db.UpdateSeason")
			}
			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 season == nil {
			throw.NotFound(s, w, r, r.URL.Path)
			return
		}

		notify.Success(s, w, r, "Season Updated", fmt.Sprintf("Successfully updated season: %s", season.Name), nil)
		w.Header().Set("HX-Redirect", fmt.Sprintf("/seasons/%s", season.ShortName))
		w.WriteHeader(http.StatusOK)
	})
}