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

// SeasonLeagueTeamsPage renders the teams tab of a season league page
func SeasonLeagueTeamsPage(
	s *hws.Server,
	conn *db.DB,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		seasonStr := r.PathValue("season_short_name")
		leagueStr := r.PathValue("league_short_name")

		var season *db.Season
		var league *db.League
		var teams []*db.Team
		var available []*db.Team

		if ok := conn.WithReadTx(s, w, r, func(ctx context.Context, tx bun.Tx) (bool, error) {
			var err error
			season, league, teams, err = db.GetSeasonLeagueWithTeams(ctx, tx, seasonStr, leagueStr)
			if err != nil {
				if db.IsBadRequest(err) {
					throw.NotFound(s, w, r, r.URL.Path)
					return false, nil
				}
				return false, errors.Wrap(err, "db.GetSeasonLeague")
			}

			available, err = db.GetList[db.Team](tx).
				Join("LEFT JOIN team_participations tp ON tp.team_id = t.id").
				Where("NOT tp.season_id = ? OR tp.season_id IS NULL", season.ID).
				GetAll(ctx)
			if err != nil {
				return false, errors.Wrap(err, "db.GetList[Team]")
			}

			return true, nil
		}); !ok {
			return
		}

		if r.Method == "GET" {
			renderSafely(seasonsview.SeasonLeagueTeamsPage(season, league, teams, available), s, r, w)
		} else {
			renderSafely(seasonsview.SeasonLeagueTeams(season, league, teams, available), s, r, w)
		}
	})
}