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"
)

// ForfeitFixture handles POST /fixtures/{fixture_id}/forfeit
// Creates a finalized forfeit result for the fixture. Requires fixtures.manage permission.
func ForfeitFixture(
	s *hws.Server,
	conn *db.DB,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		fixtureID, err := strconv.Atoi(r.PathValue("fixture_id"))
		if err != nil {
			throw.BadRequest(s, w, r, "Invalid fixture ID", err)
			return
		}

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

		// Validate forfeit type
		if forfeitType != db.ForfeitTypeMutual && forfeitType != db.ForfeitTypeOutright {
			notify.Warn(s, w, r, "Invalid Forfeit Type", "Forfeit type must be 'mutual' or 'outright'.", nil)
			return
		}

		// Validate forfeit team for outright forfeits
		if forfeitType == db.ForfeitTypeOutright {
			if forfeitTeam != "home" && forfeitTeam != "away" {
				notify.Warn(s, w, r, "Missing Team", "An outright forfeit requires specifying which team forfeited.", nil)
				return
			}
		}

		if ok := conn.WithNotifyTx(s, w, r, func(ctx context.Context, tx bun.Tx) (bool, error) {
			fixture, err := db.GetFixture(ctx, tx, fixtureID)
			if err != nil {
				if db.IsBadRequest(err) {
					respond.NotFound(w, errors.Wrap(err, "db.GetFixture"))
					return false, nil
				}
				return false, errors.Wrap(err, "db.GetFixture")
			}

			// Check if a result already exists
			existing, err := db.GetFixtureResult(ctx, tx, fixtureID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetFixtureResult")
			}
			if existing != nil {
				notify.Warn(s, w, r, "Result Exists",
					"A result already exists for this fixture. Discard it first to record a forfeit.", nil)
				return false, nil
			}

			user := db.CurrentUser(ctx)

			_, err = db.CreateForfeitResult(ctx, tx, fixture, forfeitType, forfeitTeam, forfeitReason, user.ID, 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.CreateForfeitResult")
			}
			return true, nil
		}); !ok {
			return
		}

		notify.SuccessWithDelay(s, w, r, "Forfeit Recorded", "The forfeit has been recorded and finalized.", nil)
		respond.HXRedirect(w, "/fixtures/%d", fixtureID)
	})
}