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

// ProfileRedirect redirects the authenticated user to their own player page.
func ProfileRedirect(
	s *hws.Server,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		user := db.CurrentUser(r.Context())
		if user == nil {
			throw.Unauthorized(s, w, r, "You must be logged in to view your profile", errors.New("user not authenticated"))
			return
		}
		if user.Player == nil {
			throw.InternalServiceError(s, w, r, "Player profile not found", errors.New("user has no linked player"))
			return
		}
		http.Redirect(w, r, fmt.Sprintf("/players/%d", user.Player.ID), http.StatusSeeOther)
	})
}

// PlayerView renders the player profile page.
// If the player has no SlapID and the viewer is the player's owner, show the link prompt.
// If the player has no SlapID and the viewer is not the owner, show 404.
func PlayerView(
	s *hws.Server,
	conn *db.DB,
) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		playerIDStr := r.PathValue("player_id")

		playerID, err := strconv.Atoi(playerIDStr)
		if err != nil {
			throw.NotFound(s, w, r, r.URL.Path)
			return
		}

		var player *db.Player
		var isOwner bool

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

			// Check if the current user owns this player
			user := db.CurrentUser(ctx)
			if user != nil && player.UserID != nil && *player.UserID == user.ID {
				isOwner = true
			}

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

		// If player has no SlapID and viewer is not the owner, show 404
		if player.SlapID == nil && !isOwner {
			throw.NotFound(s, w, r, r.URL.Path)
			return
		}

		renderSafely(playersview.PlayerPage(player, isOwner), s, r, w)
	})
}