(function () {
    "use strict";

    var loadingDiv = document.getElementById("scoreboard-loading");
    var recentSection = document.getElementById("recent-games-section");
    var recentTbody = document.querySelector("#recent-games-table tbody");
    var popularSection = document.getElementById("popular-section");
    var popularRow = document.getElementById("popular-row");
    var leaderboardsSection = document.getElementById("leaderboards-section");
    var leaderboardsContainer = document.getElementById("leaderboards-container");
    var emptyDiv = document.getElementById("scoreboard-empty");

    function formatTime(seconds) {
        var mins = Math.floor(seconds / 60);
        var secs = Math.floor(seconds % 60);
        return mins + ":" + (secs < 10 ? "0" : "") + secs;
    }

    function formatDate(iso) {
        return new Date(iso).toLocaleDateString();
    }

    function titleCase(str) {
        return str.charAt(0).toUpperCase() + str.slice(1);
    }

    function escapeHtml(str) {
        var div = document.createElement("div");
        div.textContent = str;
        return div.innerHTML;
    }

    // Recent games from localStorage
    function getRecentGames() {
        try {
            return JSON.parse(localStorage.getItem("ws-recent-games") || "[]");
        } catch (e) {
            return [];
        }
    }

    function renderRecentGames(games) {
        recentTbody.innerHTML = "";
        games.forEach(function (g) {
            var tr = document.createElement("tr");
            tr.innerHTML =
                "<td>" + escapeHtml(titleCase(g.category)) + "</td>" +
                "<td>" + escapeHtml(g.player_name) + "</td>" +
                "<td>" + escapeHtml(g.time_display || formatTime(g.time_seconds)) + "</td>" +
                "<td>" + g.board_size + "x" + g.board_size + "</td>" +
                "<td>" + g.word_count + "</td>" +
                "<td>" + formatDate(g.completed_at) + "</td>";
            recentTbody.appendChild(tr);
        });
    }

    function renderPopularCategories(categories) {
        popularRow.innerHTML = "";
        var active = categories.filter(function (c) { return c.completed_games > 0; });
        active.forEach(function (c) {
            var col = document.createElement("div");
            col.className = "col-md-4 col-lg-3";
            col.innerHTML =
                '<div class="card text-center">' +
                '  <div class="card-body">' +
                '    <h5 class="card-title">' + escapeHtml(titleCase(c.name)) + '</h5>' +
                '    <p class="card-text text-muted">' + c.completed_games + ' games completed</p>' +
                '    <a href="/game" class="btn btn-accent btn-sm">Play</a>' +
                '  </div>' +
                '</div>';
            popularRow.appendChild(col);
        });
    }

    function renderLeaderboards(leaderboards) {
        leaderboardsContainer.innerHTML = "";
        var names = Object.keys(leaderboards);
        names.sort();
        names.forEach(function (catName) {
            var entries = leaderboards[catName];
            var card = document.createElement("div");
            card.className = "card mb-3";

            var header = '<div class="card-header">' +
                '<i class="bi bi-trophy"></i> ' + escapeHtml(titleCase(catName)) +
                '</div>';

            var rows = "";
            entries.forEach(function (e, i) {
                rows +=
                    "<tr>" +
                    "<td>" + (i + 1) + "</td>" +
                    "<td>" + escapeHtml(e.player_name) + "</td>" +
                    "<td>" + formatTime(e.time_seconds) + "</td>" +
                    "<td>" + e.board_size + "x" + e.board_size + "</td>" +
                    "<td>" + e.word_count + "</td>" +
                    "<td>" + formatDate(e.completed_at) + "</td>" +
                    "</tr>";
            });

            card.innerHTML = header +
                '<div class="card-body p-0">' +
                '<div class="table-responsive">' +
                '<table class="table table-hover mb-0">' +
                '<thead><tr>' +
                '<th>#</th><th>Player</th><th>Time</th>' +
                '<th>Board</th><th>Words</th><th>Date</th>' +
                '</tr></thead>' +
                '<tbody>' + rows + '</tbody>' +
                '</table></div></div>';

            leaderboardsContainer.appendChild(card);
        });
    }

    async function loadScoreboard() {
        try {
            var resp = await fetch("/api/scoreboard");
            if (!resp.ok) throw new Error("Failed to load");
            var data = await resp.json();

            loadingDiv.classList.add("d-none");

            // Recent games from localStorage
            var recent = getRecentGames();
            if (recent.length > 0) {
                renderRecentGames(recent);
                recentSection.classList.remove("d-none");
            }

            // Popular categories
            var hasCompleted = data.popular_categories.some(function (c) {
                return c.completed_games > 0;
            });
            if (hasCompleted) {
                renderPopularCategories(data.popular_categories);
                popularSection.classList.remove("d-none");
            }

            // Leaderboards
            var hasLeaderboards = Object.keys(data.leaderboards).length > 0;
            if (hasLeaderboards) {
                renderLeaderboards(data.leaderboards);
                leaderboardsSection.classList.remove("d-none");
            }

            // Empty state
            if (!hasCompleted && !hasLeaderboards && recent.length === 0) {
                emptyDiv.classList.remove("d-none");
            }
        } catch (err) {
            loadingDiv.innerHTML =
                '<p class="text-danger">Failed to load scoreboard data.</p>';
        }
    }

    loadScoreboard();
})();