package handlers

import (
	"context"
	"net/http"

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

// IsTeamShortNamesUnique checks if the combination of short_name and alt_short_name is unique
// and also validates that they are different from each other
func IsTeamShortNamesUnique(
	s *hws.Server,
	conn *bun.DB,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		getter, err := validation.ParseForm(r)
		if err != nil {
			w.WriteHeader(http.StatusBadRequest)
			return
		}

		shortName := getter.String("short_name").TrimSpace().ToUpper().MaxLength(3).Value
		altShortName := getter.String("alt_short_name").TrimSpace().ToUpper().MaxLength(3).Value

		if shortName == "" || altShortName == "" {
			w.WriteHeader(http.StatusOK)
			return
		}

		if shortName == altShortName {
			w.WriteHeader(http.StatusConflict)
			return
		}

		var isUnique bool
		if ok := db.WithReadTx(s, w, r, conn, func(ctx context.Context, tx bun.Tx) (bool, error) {
			isUnique, err = db.TeamShortNamesUnique(ctx, tx, shortName, altShortName)
			if err != nil {
				return false, errors.Wrap(err, "db.TeamShortNamesUnique")
			}
			return true, nil
		}); !ok {
			return
		}

		if isUnique {
			w.WriteHeader(http.StatusOK)
		} else {
			w.WriteHeader(http.StatusConflict)
		}
	})
}