(function () {
    var VALID_TABS = ['cp', 'brother', 'sister'];
    var LEVEL_IMAGES = {
        1: './assets/level-1@4x.png',
        2: './assets/level-2@4x.png',
        3: './assets/level-3@4x.png',
        4: './assets/level-4@4x.png',
        5: './assets/level-5@4x.png',
    };

    var page = document.getElementById('page');
    var contentPanel = document.getElementById('contentPanel');
    var backButton = document.getElementById('backButton');
    var tabButtons = Array.prototype.slice.call(
        document.querySelectorAll('.tab-button[data-tab]')
    );

    var state = {
        activeTab: normalizeTab(readParam('tab')) || 'cp',
        tabs: {
            cp: [normalizeLevel(readParam('level')) || 1],
            brother: [2, 2],
            sister: [4, 5],
        },
    };

    function readParam(name) {
        var params = new URLSearchParams(window.location.search || '');
        return params.get(name);
    }

    function normalizeTab(value) {
        var tab = String(value || '')
            .trim()
            .toLowerCase();
        return VALID_TABS.indexOf(tab) >= 0 ? tab : '';
    }

    function normalizeLevel(value) {
        var level = Number(value);
        return Number.isFinite(level) && level >= 1 && level <= 5
            ? Math.floor(level)
            : 0;
    }

    function t(key, fallback) {
        if (window.HyAppI18n && window.HyAppI18n.t) {
            return window.HyAppI18n.t(key, fallback);
        }
        return fallback || key;
    }

    function escapeHTML(value) {
        return String(value == null ? '' : value)
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;')
            .replace(/'/g, '&#39;');
    }

    function setActiveTab(tab) {
        var nextTab = normalizeTab(tab) || 'cp';
        state.activeTab = nextTab;
        page.setAttribute('data-tab', nextTab);
        tabButtons.forEach(function (button) {
            button.classList.toggle(
                'is-active',
                button.getAttribute('data-tab') === nextTab
            );
        });
        render();
    }

    function cardHTML(level, index) {
        var safeLevel = normalizeLevel(level) || 1;
        var label = t('cpSpace.levelCard', 'Best friend level {level}').replace(
            '{level}',
            String(safeLevel)
        );

        return [
            '<article class="relation-card" data-level="',
            safeLevel,
            '">',
            '<img src="',
            LEVEL_IMAGES[safeLevel],
            '" alt="',
            escapeHTML(label),
            '" draggable="false" />',
            '<button class="cancel-hotspot" type="button" data-cancel-index="',
            index,
            '" aria-label="',
            escapeHTML(t('cpSpace.cancel', 'Cancel')),
            '"></button>',
            '</article>',
        ].join('');
    }

    function render() {
        var levels = state.tabs[state.activeTab] || [];
        if (!levels.length) {
            contentPanel.innerHTML =
                '<div class="empty-state">' +
                escapeHTML(t('cpSpace.empty', 'No relationship data yet.')) +
                '</div>';
            return;
        }

        contentPanel.innerHTML =
            '<div class="relation-list">' +
            levels.map(cardHTML).join('') +
            '</div>';
    }

    function applyExternalData(payload) {
        var data = payload || {};
        var nextTabs = {};
        VALID_TABS.forEach(function (tab) {
            var raw = data[tab];
            if (!Array.isArray(raw)) return;
            var normalized = raw
                .map(function (item) {
                    return normalizeLevel(
                        typeof item === 'object' ? item.level : item
                    );
                })
                .filter(Boolean);
            if (normalized.length) nextTabs[tab] = normalized;
        });

        // Flutter 可以在 WebView 注入 window.HyAppCPSpaceData 或派发 hyapp:cp-space-data；
        // 页面只接受 1-5 的等级编号，避免 H5 自己猜测关系状态或渲染后端未确认的数据。
        Object.keys(nextTabs).forEach(function (tab) {
            state.tabs[tab] = nextTabs[tab];
        });
        if (normalizeTab(data.activeTab)) state.activeTab = data.activeTab;
        setActiveTab(state.activeTab);
    }

    function handleCancel(index) {
        var level = (state.tabs[state.activeTab] || [])[Number(index)] || 0;
        if (window.HyAppBridge && window.HyAppBridge.post) {
            window.HyAppBridge.post('cpSpaceCancel', {
                relation_type: state.activeTab,
                level: level,
            });
        }
    }

    function bindEvents() {
        if (backButton) {
            backButton.addEventListener('click', function () {
                if (window.HyAppBridge && window.HyAppBridge.back) {
                    window.HyAppBridge.back();
                    return;
                }
                window.history.back();
            });
        }

        tabButtons.forEach(function (button) {
            button.addEventListener('click', function () {
                setActiveTab(button.getAttribute('data-tab'));
            });
        });

        contentPanel.addEventListener('click', function (event) {
            var target = event.target.closest('[data-cancel-index]');
            if (!target) return;
            handleCancel(target.getAttribute('data-cancel-index'));
        });

        window.addEventListener('hyapp:cp-space-data', function (event) {
            applyExternalData(event.detail || {});
        });

        window.addEventListener('hyapp:i18n-ready', render);
    }

    bindEvents();
    if (window.HyAppCPSpaceData) applyExternalData(window.HyAppCPSpaceData);
    else setActiveTab(state.activeTab);

    if (window.HyAppBridge && window.HyAppBridge.ready) {
        window.HyAppBridge.ready({ page: 'cp-space' });
    }
})();