const PageDashboard = {
    _el: null,
    _currentCategory: 'all',
    _selectedGameId: null,

    init() {
        this._el = document.getElementById('page-dashboard');
    },

    async render() {
        const cfg = await API.getConfig();
        this._selectedGameId = cfg.selected_game_id;
        this._el.innerHTML = this._template();
        await this._loadCategories();
        await this._loadThemes();
        this._bindEvents();
    },

    async _loadCategories() {
        try {
            const cats = await API.getCategories();
            const listEl = document.getElementById('dash-category-list');
            if (!listEl) return;

            const allItem = document.createElement('div');
            allItem.className = 'category-item active';
            allItem.textContent = '全部';
            allItem.dataset.cat = 'all';
            listEl.appendChild(allItem);

            cats.forEach(cat => {
                const item = document.createElement('div');
                item.className = 'category-item';
                item.textContent = cat;
                item.dataset.cat = cat;
                listEl.appendChild(item);
            });
        } catch (e) {
            console.error('Failed to load categories:', e);
        }
    },

    async _loadThemes() {
        const gridEl = document.getElementById('dash-theme-grid');
        if (!gridEl) return;

        gridEl.innerHTML = '<div style="text-align:center;padding:40px;color:var(--text-tertiary);">加载中...</div>';

        try {
            let themes = await API.getDashboards(this._currentCategory);
            if (!themes || themes.length === 0) {
                gridEl.innerHTML = this._emptyHtml();
                return;
            }

            if (this._selectedGameId) {
                themes = themes.filter(t => this._isGameSupported(t));
            }

            if (themes.length === 0) {
                gridEl.innerHTML = this._emptyHtml('当前游戏没有兼容的仪表盘');
                return;
            }

            gridEl.innerHTML = themes.map(t => this._themeCardHtml(t)).join('');
        } catch (e) {
            console.error('Failed to load themes:', e);
            gridEl.innerHTML = '<div style="text-align:center;padding:40px;color:var(--danger);">加载失败</div>';
        }
    },

    _isGameSupported(theme) {
        const supported = theme.supported_games || 'all';
        if (supported === 'all') return true;
        const ids = supported.split(',').map(s => s.trim());
        return ids.includes(this._selectedGameId);
    },

    _emptyHtml(msg) {
        return `
        <div class="empty-state" style="grid-column:1/-1;">
            <svg viewBox="0 0 24 24" width="64" height="64"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm0-12c-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4-1.79-4-4-4z" fill="currentColor"/></svg>
            <h4>${msg || '暂无仪表盘主题'}</h4>
            <p>创建或导入你的仪表盘主题</p>
        </div>`;
    },

    _bindEvents() {
        const categoryList = document.getElementById('dash-category-list');
        if (categoryList) {
            categoryList.addEventListener('click', (e) => {
                const item = e.target.closest('.category-item');
                if (!item) return;
                categoryList.querySelectorAll('.category-item').forEach(el => el.classList.remove('active'));
                item.classList.add('active');
                this._currentCategory = item.dataset.cat;
                this._loadThemes();
            });
        }

        const gridEl = document.getElementById('dash-theme-grid');
        if (gridEl) {
            gridEl.addEventListener('click', (e) => {
                const card = e.target.closest('.theme-card');
                if (!card) return;
                const themeId = card.dataset.themeId;
                this._openDashboard(themeId);
            });
            gridEl.addEventListener('contextmenu', (e) => {
                const card = e.target.closest('.theme-card');
                if (!card) return;
                e.preventDefault();
                const themeId = card.dataset.themeId;
                this._exportDashboard(themeId);
            });
        }

        document.getElementById('btn-import-dashboard')?.addEventListener('click', () => {
            const input = document.createElement('input');
            input.type = 'file';
            input.accept = '.tsd';
            input.onchange = async (e) => {
                const file = e.target.files[0];
                if (!file) return;
                const formData = new FormData();
                formData.append('file', file);
                try {
                    const res = await fetch('/api/dashboards/import', { method: 'POST', body: formData });
                    const data = await res.json();
                    if (data.ok) { Toast.show('仪表盘导入成功', 'success'); this._loadThemes(); }
                    else Toast.show('导入失败', 'error');
                } catch (err) { Toast.show('导入失败', 'error'); }
            };
            input.click();
        });
    },

    _openDashboard(themeId) {
        const gameParam = this._selectedGameId ? `?game=${this._selectedGameId}` : '';
        const url = `${location.origin}/dashboard/${themeId}${gameParam}`;
        window.open(url, '_blank');
        navigator.clipboard.writeText(url).then(() => {
            Toast.show('链接已复制，可在局域网设备访问', 'success');
        }).catch(() => {
            Toast.show(`打开地址: ${url}`, 'info');
        });
    },

    _exportDashboard(themeId) {
        const a = document.createElement('a');
        a.href = `/api/dashboards/${themeId}/export`;
        a.download = `${themeId}.tsd`;
        a.click();
        Toast.show('正在下载 .tsd 文件...', 'info');
    },

    _themeCardHtml(theme) {
        const icon = theme.icon || '📊';
        const aspect = theme.aspect_ratio || 'auto';
        const supported = theme.supported_games || 'all';
        const isAll = supported === 'all';
        const compatLabel = isAll ? '全' : '限';
        const compatClass = isAll ? 'badge-info' : 'badge-warning';
        return `
        <div class="glass-card theme-card" data-theme-id="${theme.id}">
            <div class="theme-card-preview">${icon}</div>
            <div class="theme-card-info">
                <div class="theme-card-name">${theme.name || 'Unnamed'}</div>
                <div class="theme-card-meta">
                    <span>${theme.category || 'basic'}</span>
                    <span>${aspect}</span>
                </div>
                <div class="theme-card-meta" style="margin-top:4px;">
                    <span>${theme.author || ''}</span>
                    <span class="badge ${compatClass}">${compatLabel}</span>
                </div>
            </div>
        </div>`;
    },

    _template() {
        return `
        <div class="dashboard-layout">
            <div class="dashboard-sub-sidebar">
                <div id="dash-category-list"></div>
                <div style="padding:8px 12px;margin-top:auto;">
                    <button id="btn-import-dashboard" class="btn btn-sm btn-secondary" style="width:100%;">导入 .tsd</button>
                </div>
            </div>
            <div class="dashboard-main">
                <div id="dash-theme-grid" class="theme-grid"></div>
            </div>
        </div>`;
    }
};

window.PageDashboard = PageDashboard;