// 状态
let currentAgent = null;
let currentSession = null;

// API 调用
async function fetchAPI(endpoint) {
    const response = await fetch(`/api${endpoint}`);
    if (!response.ok) {
        throw new Error(`API Error: ${response.status}`);
    }
    return response.json();
}

// 格式化时间
function formatTime(isoString) {
    if (!isoString) return '-';
    const date = new Date(isoString);
    return date.toLocaleString('zh-CN', {
        month: '2-digit',
        day: '2-digit',
        hour: '2-digit',
        minute: '2-digit'
    });
}

function formatFullTime(isoString) {
    if (!isoString) return '-';
    const date = new Date(isoString);
    return date.toLocaleString('zh-CN', {
        year: 'numeric',
        month: '2-digit',
        day: '2-digit',
        hour: '2-digit',
        minute: '2-digit',
        second: '2-digit'
    });
}

// 格式化数字
function formatNumber(num) {
    if (!num) return '0';
    if (num >= 1000000) return (num / 1000000).toFixed(1) + 'M';
    if (num >= 1000) return (num / 1000).toFixed(1) + 'K';
    return num.toString();
}

// 截断文本
function truncate(text, maxLen = 100) {
    if (!text) return '';
    if (text.length <= maxLen) return text;
    return text.substring(0, maxLen) + '...';
}

// 加载智能体列表
async function loadAgents() {
    const container = document.getElementById('agents-list');
    container.innerHTML = '<div class="loading">加载中...</div>';
    
    try {
        const agents = await fetchAPI('/agents');
        
        if (agents.length === 0) {
            container.innerHTML = '<div class="placeholder">没有找到智能体</div>';
            return;
        }
        
        container.innerHTML = agents.map(agent => `
            <div class="agent-item ${currentAgent === agent.name ? 'active' : ''}" 
                 onclick="selectAgent('${agent.name}')">
                <div class="name">🤖 ${agent.name}</div>
                <div class="meta">
                    <span>💬 ${agent.sessionCount}</span>
                    <span>${formatTime(agent.lastActive)}</span>
                </div>
            </div>
        `).join('');
    } catch (error) {
        container.innerHTML = `<div class="placeholder">加载失败: ${error.message}</div>`;
    }
}

// 选择智能体
async function selectAgent(agentName) {
    currentAgent = agentName;
    currentSession = null;
    
    // 更新UI
    document.querySelectorAll('.agent-item').forEach(el => el.classList.remove('active'));
    event.target.closest('.agent-item')?.classList.add('active');
    
    document.getElementById('agent-name-display').textContent = `- ${agentName}`;
    document.getElementById('session-id-display').textContent = '';
    document.getElementById('messages-list').innerHTML = '<div class="placeholder">请选择一个会话</div>';
    
    // 加载会话列表
    await loadSessions(agentName);
}

// 加载会话列表
async function loadSessions(agentName) {
    const container = document.getElementById('sessions-list');
    container.innerHTML = '<div class="loading">加载中...</div>';
    
    try {
        const sessions = await fetchAPI(`/agents/${agentName}/sessions`);
        
        if (sessions.length === 0) {
            container.innerHTML = '<div class="placeholder">没有找到会话</div>';
            return;
        }
        
        container.innerHTML = sessions.map(session => `
            <div class="session-item ${currentSession === session.sessionId ? 'active' : ''}" 
                 onclick="selectSession('${agentName}', '${session.sessionId}')">
                <div class="channel ${session.channel}">${session.channel}</div>
                <span class="status ${session.status}">${session.status}</span>
                <div class="meta">
                    <span class="model">${session.model}</span>
                    <span>${formatTime(session.updatedAt)}</span>
                </div>
                <div class="target">${truncate(session.target, 50)}</div>
                <div class="tokens">
                    📊 ${formatNumber(session.totalTokens)} tokens 
                    (${formatNumber(session.inputTokens)} in / ${formatNumber(session.outputTokens)} out)
                </div>
            </div>
        `).join('');
    } catch (error) {
        container.innerHTML = `<div class="placeholder">加载失败: ${error.message}</div>`;
    }
}

// 选择会话
async function selectSession(agentName, sessionId) {
    currentSession = sessionId;
    
    // 更新UI
    document.querySelectorAll('.session-item').forEach(el => el.classList.remove('active'));
    event.target.closest('.session-item')?.classList.add('active');
    
    document.getElementById('session-id-display').textContent = `- ${sessionId.substring(0, 8)}...`;
    
    // 加载消息
    await loadMessages(agentName, sessionId);
}

// 加载消息
async function loadMessages(agentName, sessionId) {
    const container = document.getElementById('messages-list');
    container.innerHTML = '<div class="loading">加载中...</div>';
    
    try {
        const messages = await fetchAPI(`/agents/${agentName}/sessions/${sessionId}/messages`);
        
        if (messages.length === 0) {
            container.innerHTML = '<div class="placeholder">没有找到消息</div>';
            return;
        }
        
        container.innerHTML = messages.map((msg, index) => `
            <div class="message-item ${msg.role}" data-agent="${agentName}" data-session="${sessionId}" data-msg-id="${msg.id}">
                <div class="header">
                    <span class="role ${msg.role}">${msg.role}</span>
                    <span class="time">${formatFullTime(msg.timestamp)}</span>
                </div>
                <div class="content ${msg.fullContent ? 'truncated' : ''}">${escapeHtml(msg.content)}</div>
                ${msg.fullContent ? `<button class="expand-btn" onclick="showFullMessage('${agentName}', '${sessionId}', '${msg.id}')">查看完整内容</button>` : ''}
            </div>
        `).join('');
    } catch (error) {
        container.innerHTML = `<div class="placeholder">加载失败: ${error.message}</div>`;
    }
}

// 显示完整消息
async function showFullMessage(agentName, sessionId, messageId) {
    const modal = document.getElementById('message-modal');
    const content = document.getElementById('modal-content');
    
    modal.classList.remove('hidden');
    content.textContent = '加载中...';
    
    try {
        const msg = await fetchAPI(`/agents/${agentName}/sessions/${sessionId}/messages/${messageId}`);
        document.getElementById('modal-title').textContent = `${msg.role.toUpperCase()} - ${formatFullTime(msg.timestamp)}`;
        content.textContent = msg.content;
    } catch (error) {
        content.textContent = `加载失败: ${error.message}`;
    }
}

// 关闭模态框
function closeModal() {
    document.getElementById('message-modal').classList.add('hidden');
}

// HTML 转义
function escapeHtml(text) {
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
}

// 键盘事件
document.addEventListener('keydown', (e) => {
    if (e.key === 'Escape') {
        closeModal();
    }
});

// 点击模态框外部关闭
document.getElementById('message-modal').addEventListener('click', (e) => {
    if (e.target === e.currentTarget) {
        closeModal();
    }
});

// 初始化
loadAgents();