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"
)

// SeasonLeagueTablePage renders the table tab of a season league page
func SeasonLeagueTablePage(
	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 leaderboard []*db.LeaderboardEntry

		if ok := conn.WithReadTx(s, w, r, func(ctx context.Context, tx bun.Tx) (bool, error) {
			var err error
			var teams []*db.Team
			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.GetSeasonLeagueWithTeams")
			}

			fixtures, err := db.GetAllocatedFixtures(ctx, tx, season.ID, league.ID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetAllocatedFixtures")
			}

			fixtureIDs := make([]int, len(fixtures))
			for i, f := range fixtures {
				fixtureIDs[i] = f.ID
			}

			resultMap, err := db.GetFinalizedResultsForFixtures(ctx, tx, fixtureIDs)
			if err != nil {
				return false, errors.Wrap(err, "db.GetFinalizedResultsForFixtures")
			}

			leaderboard = db.ComputeLeaderboard(teams, fixtures, resultMap)

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

		if r.Method == "GET" {
			renderSafely(seasonsview.SeasonLeagueTablePage(season, league, leaderboard), s, r, w)
		} else {
			renderSafely(seasonsview.SeasonLeagueTable(leaderboard), s, r, w)
		}
	})
}