package handlers

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

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

// SeriesDetailPage redirects to the default tab (overview)
func SeriesDetailPage(
	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
		}

		http.Redirect(w, r, fmt.Sprintf("/series/%d/overview", seriesID), http.StatusSeeOther)
	})
}

// SeriesDetailOverviewPage renders the overview tab of the series detail page
func SeriesDetailOverviewPage(
	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
		}

		var series *db.PlayoffSeries
		var currentSchedule *db.PlayoffSeriesSchedule
		var canSchedule bool
		var userTeamID int
		var rosters map[string][]*db.PlayerWithPlayStatus

		if ok := conn.WithReadTx(s, w, r, func(ctx context.Context, tx bun.Tx) (bool, error) {
			var err error
			series, err = db.GetPlayoffSeriesByID(ctx, tx, seriesID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetPlayoffSeriesByID")
			}
			if series == nil {
				throw.NotFound(s, w, r, r.URL.Path)
				return false, nil
			}

			currentSchedule, err = db.GetCurrentSeriesSchedule(ctx, tx, seriesID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetCurrentSeriesSchedule")
			}

			user := db.CurrentUser(ctx)
			canSchedule, userTeamID, err = db.CanScheduleSeries(ctx, tx, series, user)
			if err != nil {
				return false, errors.Wrap(err, "db.CanScheduleSeries")
			}

			rosters, err = db.GetSeriesTeamRosters(ctx, tx, series)
			if err != nil {
				return false, errors.Wrap(err, "db.GetSeriesTeamRosters")
			}

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

		if r.Method == "GET" {
			renderSafely(seasonsview.SeriesDetailOverviewPage(
				series, currentSchedule, canSchedule, userTeamID, rosters,
			), s, r, w)
		} else {
			renderSafely(seasonsview.SeriesDetailOverviewContent(
				series, currentSchedule, canSchedule, userTeamID, rosters,
			), s, r, w)
		}
	})
}

// SeriesDetailPreviewPage renders the match preview tab of the series detail page
func SeriesDetailPreviewPage(
	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
		}

		var series *db.PlayoffSeries
		var currentSchedule *db.PlayoffSeriesSchedule
		var rosters map[string][]*db.PlayerWithPlayStatus
		var previewData *db.MatchPreviewData

		if ok := conn.WithReadTx(s, w, r, func(ctx context.Context, tx bun.Tx) (bool, error) {
			var err error
			series, err = db.GetPlayoffSeriesByID(ctx, tx, seriesID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetPlayoffSeriesByID")
			}
			if series == nil {
				throw.NotFound(s, w, r, r.URL.Path)
				return false, nil
			}

			currentSchedule, err = db.GetCurrentSeriesSchedule(ctx, tx, seriesID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetCurrentSeriesSchedule")
			}

			rosters, err = db.GetSeriesTeamRosters(ctx, tx, series)
			if err != nil {
				return false, errors.Wrap(err, "db.GetSeriesTeamRosters")
			}

			previewData, err = db.ComputeSeriesPreview(ctx, tx, series)
			if err != nil {
				return false, errors.Wrap(err, "db.ComputeSeriesPreview")
			}

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

		// If completed, redirect to analysis instead
		if series.Status == db.SeriesStatusCompleted {
			if r.Method == "GET" {
				http.Redirect(w, r, fmt.Sprintf("/series/%d/analysis", seriesID), http.StatusSeeOther)
			} else {
				respond.HXRedirect(w, "/series/%d/analysis", seriesID)
			}
			return
		}

		if r.Method == "GET" {
			renderSafely(seasonsview.SeriesDetailPreviewPage(
				series, currentSchedule, rosters, previewData,
			), s, r, w)
		} else {
			renderSafely(seasonsview.SeriesDetailPreviewContent(
				series, rosters, previewData,
			), s, r, w)
		}
	})
}

// SeriesDetailAnalysisPage renders the match analysis tab of the series detail page
func SeriesDetailAnalysisPage(
	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
		}

		var series *db.PlayoffSeries
		var currentSchedule *db.PlayoffSeriesSchedule
		var rosters map[string][]*db.PlayerWithPlayStatus
		var previewData *db.MatchPreviewData

		if ok := conn.WithReadTx(s, w, r, func(ctx context.Context, tx bun.Tx) (bool, error) {
			var err error
			series, err = db.GetPlayoffSeriesByID(ctx, tx, seriesID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetPlayoffSeriesByID")
			}
			if series == nil {
				throw.NotFound(s, w, r, r.URL.Path)
				return false, nil
			}

			currentSchedule, err = db.GetCurrentSeriesSchedule(ctx, tx, seriesID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetCurrentSeriesSchedule")
			}

			rosters, err = db.GetSeriesTeamRosters(ctx, tx, series)
			if err != nil {
				return false, errors.Wrap(err, "db.GetSeriesTeamRosters")
			}

			previewData, err = db.ComputeSeriesPreview(ctx, tx, series)
			if err != nil {
				return false, errors.Wrap(err, "db.ComputeSeriesPreview")
			}

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

		// If not completed, redirect to preview instead
		if series.Status != db.SeriesStatusCompleted {
			if r.Method == "GET" {
				http.Redirect(w, r, fmt.Sprintf("/series/%d/preview", seriesID), http.StatusSeeOther)
			} else {
				respond.HXRedirect(w, "/series/%d/preview", seriesID)
			}
			return
		}

		if r.Method == "GET" {
			renderSafely(seasonsview.SeriesDetailAnalysisPage(
				series, currentSchedule, rosters, previewData,
			), s, r, w)
		} else {
			renderSafely(seasonsview.SeriesDetailAnalysisContent(
				series, rosters, previewData,
			), s, r, w)
		}
	})
}

// SeriesDetailSchedulePage renders the schedule tab of the series detail page
func SeriesDetailSchedulePage(
	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
		}

		var series *db.PlayoffSeries
		var currentSchedule *db.PlayoffSeriesSchedule
		var history []*db.PlayoffSeriesSchedule
		var canSchedule bool
		var userTeamID int

		if ok := conn.WithReadTx(s, w, r, func(ctx context.Context, tx bun.Tx) (bool, error) {
			var err error
			series, err = db.GetPlayoffSeriesByID(ctx, tx, seriesID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetPlayoffSeriesByID")
			}
			if series == nil {
				throw.NotFound(s, w, r, r.URL.Path)
				return false, nil
			}

			currentSchedule, err = db.GetCurrentSeriesSchedule(ctx, tx, seriesID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetCurrentSeriesSchedule")
			}

			history, err = db.GetSeriesScheduleHistory(ctx, tx, seriesID)
			if err != nil {
				return false, errors.Wrap(err, "db.GetSeriesScheduleHistory")
			}

			user := db.CurrentUser(ctx)
			canSchedule, userTeamID, err = db.CanScheduleSeries(ctx, tx, series, user)
			if err != nil {
				return false, errors.Wrap(err, "db.CanScheduleSeries")
			}

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

		// If completed, redirect to overview
		if series.Status == db.SeriesStatusCompleted {
			if r.Method == "GET" {
				http.Redirect(w, r, fmt.Sprintf("/series/%d/overview", seriesID), http.StatusSeeOther)
			} else {
				respond.HXRedirect(w, "/series/%d/overview", seriesID)
			}
			return
		}

		if r.Method == "GET" {
			renderSafely(seasonsview.SeriesDetailSchedulePage(
				series, currentSchedule, history, canSchedule, userTeamID,
			), s, r, w)
		} else {
			renderSafely(seasonsview.SeriesDetailScheduleContent(
				series, currentSchedule, history, canSchedule, userTeamID,
			), s, r, w)
		}
	})
}