package handlers

import (
	"context"
	"net/http"
	"strconv"

	"git.haelnorr.com/h/golib/hws"
	"git.haelnorr.com/h/oslstats/internal/db"
	"git.haelnorr.com/h/oslstats/internal/notify"
	"git.haelnorr.com/h/oslstats/internal/respond"
	"git.haelnorr.com/h/oslstats/internal/throw"
	"git.haelnorr.com/h/oslstats/internal/validation"
	"github.com/pkg/errors"
	"github.com/uptrace/bun"
)

// ForfeitSeries handles POST /series/{series_id}/forfeit
// Forfeits a playoff series. The forfeiting team loses and the opponent wins
// and advances through the bracket. Requires playoffs.manage permission.
func ForfeitSeries(
	s *hws.Server,
	conn *db.DB,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		seriesID, err := strconv.Atoi(r.PathValue("series_id"))
		if err != nil {
			throw.BadRequest(s, w, r, "Invalid series ID", err)
			return
		}

		getter, ok := validation.ParseFormOrNotify(s, w, r)
		if !ok {
			return
		}
		forfeitTeamStr := getter.String("forfeit_team").TrimSpace().Required().Value
		forfeitReason := getter.String("forfeit_reason").TrimSpace().Value
		if !getter.ValidateAndNotify(s, w, r) {
			return
		}

		// Validate forfeit_team is "team1" or "team2"
		if forfeitTeamStr != "team1" && forfeitTeamStr != "team2" {
			notify.Warn(s, w, r, "Invalid Team", "Please select which team is forfeiting.", nil)
			return
		}

		if ok := conn.WithNotifyTx(s, w, r, func(ctx context.Context, tx bun.Tx) (bool, error) {
			series, err := db.GetPlayoffSeriesByID(ctx, tx, seriesID)
			if err != nil {
				if db.IsBadRequest(err) {
					respond.NotFound(w, errors.Wrap(err, "db.GetPlayoffSeriesByID"))
					return false, nil
				}
				return false, errors.Wrap(err, "db.GetPlayoffSeriesByID")
			}
			if series == nil {
				respond.NotFound(w, errors.New("series not found"))
				return false, nil
			}

			// Resolve the forfeit team ID
			var forfeitTeamID int
			if forfeitTeamStr == "team1" {
				if series.Team1ID == nil {
					notify.Warn(s, w, r, "No Team", "Team 1 is not assigned.", nil)
					return false, nil
				}
				forfeitTeamID = *series.Team1ID
			} else {
				if series.Team2ID == nil {
					notify.Warn(s, w, r, "No Team", "Team 2 is not assigned.", nil)
					return false, nil
				}
				forfeitTeamID = *series.Team2ID
			}

			err = db.ForfeitSeries(ctx, tx, seriesID, forfeitTeamID, forfeitReason, db.NewAuditFromRequest(r))
			if err != nil {
				if db.IsBadRequest(err) {
					notify.Warn(s, w, r, "Cannot Forfeit", err.Error(), nil)
					return false, nil
				}
				return false, errors.Wrap(err, "db.ForfeitSeries")
			}
			return true, nil
		}); !ok {
			return
		}

		notify.SuccessWithDelay(s, w, r, "Series Forfeited", "The series has been forfeited and the opponent advances.", nil)
		respond.HXRedirect(w, "/series/%d", seriesID)
	})
}