// 全局变量
let socket = null;
let currentModalType = '';
let selectedItem = null;
let currentPath = '';
let searchResults = [];

// 初始化Socket连接
document.addEventListener('DOMContentLoaded', function() {
    socket = io();
    
    // 监听发送输出
    socket.on('send_output', function(data) {
        const output = document.getElementById('send-output');
        output.textContent += data.message;
        output.scrollTop = output.scrollHeight;
    });
    
    // 监听发送状态
    socket.on('send_status', function(data) {
        document.getElementById('send-status').textContent = data.status;
    });
    
    // 监听接收输出
    socket.on('receive_output', function(data) {
        const output = document.getElementById('receive-output');
        output.textContent += data.message;
        output.scrollTop = output.scrollHeight;
    });
    
    // 监听接收状态
    socket.on('receive_status', function(data) {
        document.getElementById('receive-status').textContent = data.status;
    });
    
    // 监听文件路径输入变化
    const filePathInput = document.getElementById('send-file-path');
    filePathInput.addEventListener('input', updateFileInfo);
    filePathInput.addEventListener('change', updateFileInfo);
    
    // 初始更新文件信息
    updateFileInfo();
});

// 更新文件信息
function updateFileInfo() {
    const filePath = document.getElementById('send-file-path').value.trim();
    const fileSizeElement = document.getElementById('file-size');
    const fileMtimeElement = document.getElementById('file-mtime');
    const fileStatusElement = document.getElementById('file-status');
    
    if (!filePath) {
        fileSizeElement.textContent = '-';
        fileMtimeElement.textContent = '-';
        fileStatusElement.textContent = '未选择';
        fileStatusElement.className = 'file-status-unknown';
        return;
    }
    
    // 检查文件是否存在
    fetch('/check/file', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'Accept': 'application/json'
        },
        body: JSON.stringify({ file_path: filePath })
    })
    .then(response => {
        const contentType = response.headers.get('content-type');
        if (!contentType || !contentType.includes('application/json')) {
            return response.text().then(text => {
                throw new Error('服务器返回了非JSON响应');
            });
        }
        return response.json();
    })
    .then(data => {
        if (data.status === 'success') {
            fileSizeElement.textContent = formatFileSize(data.size);
            fileMtimeElement.textContent = new Date(data.mtime * 1000).toLocaleString();
            fileStatusElement.textContent = '文件有效';
            fileStatusElement.className = 'file-status-valid';
        } else {
            fileSizeElement.textContent = '-';
            fileMtimeElement.textContent = '-';
            fileStatusElement.textContent = '文件不存在或无法访问';
            fileStatusElement.className = 'file-status-invalid';
        }
    })
    .catch(error => {
        console.error('检查文件错误:', error);
        fileSizeElement.textContent = '-';
        fileMtimeElement.textContent = '-';
        fileStatusElement.textContent = '检查失败';
        fileStatusElement.className = 'file-status-invalid';
    });
}

// 手动浏览文件
function browseFileManually() {
    currentModalType = 'send';
    currentPath = document.getElementById('send-file-path').value || '/';
    const filePath = document.getElementById('send-file-path').value;
    
    if (filePath) {
        try {
            const dirPath = require('path').dirname(filePath);
            if (require('fs').existsSync(dirPath)) {
                currentPath = dirPath;
            }
        } catch (e) {
            // 忽略错误，使用默认路径
        }
    }
    
    fetchFileList(currentPath, 'file');
    document.getElementById('file-browser-modal').style.display = 'block';
}


// 显示指定界面
function showScreen(screenId) {
    document.querySelectorAll('.screen').forEach(screen => {
        screen.classList.remove('active');
    });
    document.getElementById(screenId).classList.add('active');
}


// 发送连接
function sendConnect() {
    const key = document.getElementById('send-key').value;
    
    fetch('/send/connect', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({ key: key })
    })
    .then(response => response.json())
    .then(data => {
        if (data.status === 'success') {
            document.getElementById('send-connect-btn').disabled = true;
            document.getElementById('send-stop-btn').disabled = false;
            // 3秒后启用发送文件按钮
            setTimeout(() => {
                document.getElementById('send-file-btn').disabled = false;
            }, 3000);
        } else {
            alert('错误: ' + data.message);
        }
    })
    .catch(error => {
        console.error('Error:', error);
        alert('连接失败: ' + error);
    });
}

// 发送文件
function sendFile() {
    const filePath = document.getElementById('send-file-path').value;
    const key = document.getElementById('send-key').value;
    const parts = key.split('|');
    const psk = parts.length >= 3 ? parts[2].trim() : '';
    
    fetch('/send/file', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({ 
            file_path: filePath,
            psk: psk
        })
    })
    .then(response => response.json())
    .then(data => {
        if (data.status !== 'success') {
            alert('错误: ' + data.message);
        }
    })
    .catch(error => {
        console.error('Error:', error);
        alert('发送失败: ' + error);
    });
}

// 停止发送
function sendStop() {
    fetch('/send/stop', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        }
    })
    .then(response => response.json())
    .then(data => {
        if (data.status === 'success') {
            document.getElementById('send-connect-btn').disabled = false;
            document.getElementById('send-file-btn').disabled = true;
            document.getElementById('send-stop-btn').disabled = true;
        }
    })
    .catch(error => {
        console.error('Error:', error);
    });
}

// 接收连接
function receiveConnect() {
    const key = document.getElementById('receive-key').value;
    const savePath = document.getElementById('receive-save-path').value;
    
    fetch('/receive/connect', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({ 
            key: key,
            save_path: savePath
        })
    })
    .then(response => response.json())
    .then(data => {
        if (data.status === 'success') {
            document.getElementById('receive-connect-btn').disabled = true;
            document.getElementById('receive-stop-btn').disabled = false;
        } else {
            alert('错误: ' + data.message);
        }
    })
    .catch(error => {
        console.error('Error:', error);
        alert('连接失败: ' + error);
    });
}

// 停止接收
function receiveStop() {
    fetch('/receive/stop', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        }
    })
    .then(response => response.json())
    .then(data => {
        if (data.status === 'success') {
            document.getElementById('receive-connect-btn').disabled = false;
            document.getElementById('receive-stop-btn').disabled = true;
        }
    })
    .catch(error => {
        console.error('Error:', error);
    });
}

// 打开搜索模态框
function openSearchModal() {
    document.getElementById('file-search-modal').style.display = 'block';
    document.getElementById('search-path').value = '/';
    document.getElementById('search-keyword').value = '*';
    document.getElementById('search-results-list').innerHTML = '';
    document.getElementById('result-count').textContent = '0';
    document.getElementById('search-select-btn').disabled = true;
    selectedItem = null;
    searchResults = [];
}

// 关闭搜索模态框
function closeSearchModal() {
    document.getElementById('file-search-modal').style.display = 'none';
}

// 浏览搜索路径
function browseSearchPath() {
    currentModalType = 'search_path';
    currentPath = document.getElementById('search-path').value || '/';
    
    fetchFileList(currentPath, 'folder');
    document.getElementById('file-browser-modal').style.display = 'block';
}

// 开始搜索
function startSearch() {
    const searchPath = document.getElementById('search-path').value;
    const keyword = document.getElementById('search-keyword').value;
    const maxResults = document.getElementById('max-results').value;
    
    if (!keyword) {
        alert('请输入搜索关键词');
        return;
    }
    
    // 显示加载状态
    const resultsList = document.getElementById('search-results-list');
    resultsList.innerHTML = '<div class="loading">搜索中...</div>';
    
    fetch('/search/files', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'Accept': 'application/json'
        },
        body: JSON.stringify({ 
            path: searchPath,
            pattern: keyword,
            max_results: parseInt(maxResults)
        })
    })
    .then(response => {
        const contentType = response.headers.get('content-type');
        if (!contentType || !contentType.includes('application/json')) {
            return response.text().then(text => {
                throw new Error(`服务器返回了非JSON响应: ${text.substring(0, 100)}...`);
            });
        }
        return response.json();
    })
    .then(data => {
        if (data.status === 'success') {
            searchResults = data.results;
            displaySearchResults(data.results);
            document.getElementById('result-count').textContent = data.count;
        } else {
            alert('搜索失败: ' + data.message);
            resultsList.innerHTML = '<div class="no-results">搜索失败</div>';
        }
    })
    .catch(error => {
        console.error('搜索错误:', error);
        alert('搜索失败: ' + error.message);
        resultsList.innerHTML = '<div class="no-results">搜索错误</div>';
    });
}

// 显示搜索结果
function displaySearchResults(results) {
    const resultsList = document.getElementById('search-results-list');
    resultsList.innerHTML = '';
    
    if (results.length === 0) {
        resultsList.innerHTML = '<div class="no-results">未找到匹配的文件</div>';
        return;
    }
    
    results.forEach(result => {
        const div = document.createElement('div');
        div.className = 'file-item';
        
        const fileSize = formatFileSize(result.size || 0);
        
        div.innerHTML = `
            <div class="file-name">📄 ${result.name}</div>
            <div class="file-details">
                <span class="file-path">${result.relative_path}</span>
                <span class="file-size">${fileSize}</span>
            </div>
        `;
        div.dataset.path = result.path;
        
        div.addEventListener('click', function() {
            // 取消之前的选择
            document.querySelectorAll('.file-item.selected').forEach(el => {
                el.classList.remove('selected');
            });
            
            // 选择当前项
            this.classList.add('selected');
            selectedItem = this;
            document.getElementById('search-select-btn').disabled = false;
        });
        
        resultsList.appendChild(div);
    });
}


// 格式化文件大小
function formatFileSize(bytes) {
    if (bytes === 0) return '0 B';
    const k = 1024;
    const sizes = ['B', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
}

// 选择搜索结果
function selectSearchResult() {
    if (!selectedItem) {
        alert('请先选择一个文件');
        return;
    }
    
    const filePath = selectedItem.dataset.path;
    document.getElementById('send-file-path').value = filePath;
    closeSearchModal();
    updateFileInfo(); // 更新文件信息显示
}

// 获取文件列表
function fetchFileList(path, type) {
    fetch('/browse', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'Accept': 'application/json'
        },
        body: JSON.stringify({ 
            path: path,
            type: type
        })
    })
    .then(response => {
        const contentType = response.headers.get('content-type');
        if (!contentType || !contentType.includes('application/json')) {
            return response.text().then(text => {
                throw new Error(`服务器返回了非JSON响应: ${text.substring(0, 100)}...`);
            });
        }
        return response.json();
    })
    .then(data => {
        if (data.status === 'success') {
            currentPath = data.current_path;
            document.getElementById('current-path').textContent = currentPath;
            
            const fileList = document.getElementById('file-list');
            fileList.innerHTML = '';
            
            data.items.forEach(item => {
                const div = document.createElement('div');
                div.className = 'file-item';
                div.innerHTML = item.type === 'folder' ? 
                    `📁 ${item.name}` : `📄 ${item.name}`;
                div.dataset.path = item.path;
                div.dataset.type = item.type;
                
                div.addEventListener('click', function() {
                    // 取消之前的选择
                    document.querySelectorAll('.file-item.selected').forEach(el => {
                        el.classList.remove('selected');
                    });
                    
                    // 选择当前项
                    this.classList.add('selected');
                    selectedItem = this;
                    
                    // 如果是文件夹，双击进入
                    this.addEventListener('dblclick', function() {
                        if (item.type === 'folder') {
                            if (currentModalType === 'search_path') {
                                document.getElementById('search-path').value = item.path;
                                closeModal();
                            } else {
                                fetchFileList(item.path, type);
                            }
                        }
                    });
                });
                
                fileList.appendChild(div);
            });
        } else {
            alert('错误: ' + data.message);
        }
    })
    .catch(error => {
        console.error('Error:', error);
        alert('获取文件列表失败: ' + error.message);
    });
}

// 导航到上级目录
function navigateUp() {
    const parentPath = currentPath.split('/').slice(0, -1).join('/');
    if (parentPath === '') {
        currentPath = '/';
    } else {
        currentPath = parentPath;
    }
    
    const type = currentModalType === 'send' ? 'file' : 'folder';
    fetchFileList(currentPath, type);
}

// 关闭模态框
function closeModal() {
    document.getElementById('file-browser-modal').style.display = 'none';
    selectedItem = null;
}

// 选择文件或文件夹
function selectItem() {
    if (!selectedItem) {
        alert('请先选择一个项目');
        return;
    }
    
    const path = selectedItem.dataset.path;
    const type = selectedItem.dataset.type;
    
    if (currentModalType === 'send') {
        if (type === 'file') {
            document.getElementById('send-file-path').value = path;
            closeModal();
            updateFileInfo(); // 更新文件信息显示
        } else {
            alert('请选择一个文件');
        }
    } else if (currentModalType === 'folder') {
        document.getElementById('receive-save-path').value = path;
        closeModal();
    } else if (currentModalType === 'search_path') {
        document.getElementById('search-path').value = path;
        closeModal();
    }
}