<?php
/**
 * 通讯录API
 */

// 设置错误报告
error_reporting(E_ALL);
ini_set('display_errors', 0);

// 设置JSON响应头
header('Content-Type: application/json; charset=utf-8');

// 包含必要的类
require_once '../../utils/Config.php';
require_once '../../utils/Logger.php';
require_once '../../utils/Helper.php';
require_once '../../utils/Database.php';

// 处理请求
try {
    // 获取请求方法
    $method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
    
    // 连接数据库
    $db = Database::getInstance();
    
    // 根据请求方法处理
    switch ($method) {
        case 'GET':
            // 获取通讯录
            if (isset($_GET['id'])) {
                // 获取单个联系人详情
                getContactDetails($db, $_GET['id']);
            } else {
                // 获取联系人列表
                getContacts($db);
            }
            break;
        case 'POST':
            // 添加联系人
            addContact($db);
            break;
        case 'PUT':
            // 编辑联系人
            editContact($db);
            break;
        case 'DELETE':
            // 删除联系人
            deleteContact($db);
            break;
        default:
            echo json_encode([
                'success' => false,
                'message' => '不支持的请求方法'
            ]);
            break;
    }
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'message' => '服务器内部错误: ' . $e->getMessage()
    ]);
}

/**
 * 获取联系人列表
 * @param Database $db 数据库实例
 */
function getContacts($db) {
    // 获取请求参数
    $username = isset($_GET['username']) ? $_GET['username'] : '';
    $search = isset($_GET['search']) ? $_GET['search'] : '';
    $page = isset($_GET['page']) ? (int)$_GET['page'] : 1;
    $perPage = isset($_GET['perPage']) ? (int)$_GET['perPage'] : 20;
    
    // 验证必要参数
    if (empty($username)) {
        echo json_encode([
            'success' => false,
            'message' => '缺少用户名参数'
        ]);
        return;
    }
    
    // 构建查询条件
    $where = "WHERE user_id = ?";
    $params = [$username];
    
    if (!empty($search)) {
        $where .= " AND (name LIKE ? OR email LIKE ? OR phone LIKE ?)";
        $searchParam = "%$search%";
        $params[] = $searchParam;
        $params[] = $searchParam;
        $params[] = $searchParam;
    }
    
    // 计算偏移量
    $offset = ($page - 1) * $perPage;
    
    // 查询总数
    $totalSql = "SELECT COUNT(*) as total FROM contacts $where";
    $totalResult = $db->fetchOne($totalSql, $params);
    $total = $totalResult['total'];
    
    // 查询联系人列表
    $sql = "SELECT id, name, email, phone, company, department, position, create_time, update_time FROM contacts $where ORDER BY name ASC LIMIT ? OFFSET ?";
    $params[] = $perPage;
    $params[] = $offset;
    
    $contacts = $db->fetchAll($sql, $params);
    
    // 返回响应
    echo json_encode([
        'success' => true,
        'data' => [
            'contacts' => $contacts,
            'total' => $total,
            'page' => $page,
            'perPage' => $perPage,
            'totalPages' => ceil($total / $perPage)
        ]
    ]);
}

/**
 * 获取单个联系人详情
 * @param Database $db 数据库实例
 * @param int $id 联系人ID
 */
function getContactDetails($db, $id) {
    // 获取请求参数
    $username = isset($_GET['username']) ? $_GET['username'] : '';
    
    // 验证必要参数
    if (empty($username)) {
        echo json_encode([
            'success' => false,
            'message' => '缺少用户名参数'
        ]);
        return;
    }
    
    // 查询联系人详情
    $sql = "SELECT id, name, email, phone, company, department, position, create_time, update_time FROM contacts WHERE id = ? AND user_id = ?";
    $contact = $db->fetchOne($sql, [$id, $username]);
    
    if ($contact) {
        echo json_encode([
            'success' => true,
            'data' => [
                'contact' => $contact
            ]
        ]);
    } else {
        echo json_encode([
            'success' => false,
            'message' => '联系人不存在或无权访问'
        ]);
    }
}

/**
 * 添加联系人
 * @param Database $db 数据库实例
 */
function addContact($db) {
    // 获取请求数据
    $data = json_decode(file_get_contents('php://input'), true);
    
    // 验证请求数据
    if (!$data || empty($data['username']) || empty($data['name']) || empty($data['email'])) {
        echo json_encode([
            'success' => false,
            'message' => '缺少必要参数'
        ]);
        return;
    }
    
    $username = $data['username'];
    
    // 检查联系人是否已存在
    $existingContact = $db->fetchOne("SELECT id FROM contacts WHERE email = ? AND user_id = ?", [$data['email'], $username]);
    if ($existingContact) {
        echo json_encode([
            'success' => false,
            'message' => '该邮箱已存在于通讯录中'
        ]);
        return;
    }
    
    // 插入联系人
    $sql = "INSERT INTO contacts (user_id, name, email, phone, company, department, position) VALUES (?, ?, ?, ?, ?, ?, ?)";
    
    $db->insert($sql, [
        $username,
        $data['name'],
        $data['email'],
        isset($data['phone']) ? $data['phone'] : '',
        isset($data['company']) ? $data['company'] : '',
        isset($data['department']) ? $data['department'] : '',
        isset($data['position']) ? $data['position'] : ''
    ]);
    
    echo json_encode([
        'success' => true,
        'message' => '联系人添加成功'
    ]);
}

/**
 * 编辑联系人
 * @param Database $db 数据库实例
 */
function editContact($db) {
    // 获取请求数据
    $data = json_decode(file_get_contents('php://input'), true);
    
    // 验证请求数据
    if (!$data || empty($data['id']) || empty($data['username']) || empty($data['name']) || empty($data['email'])) {
        echo json_encode([
            'success' => false,
            'message' => '缺少必要参数'
        ]);
        return;
    }
    
    $id = $data['id'];
    $username = $data['username'];
    
    // 检查联系人是否存在
    $existingContact = $db->fetchOne("SELECT id FROM contacts WHERE id = ? AND user_id = ?", [$id, $username]);
    if (!$existingContact) {
        echo json_encode([
            'success' => false,
            'message' => '联系人不存在或无权访问'
        ]);
        return;
    }
    
    // 检查邮箱是否已被其他联系人使用
    $emailExists = $db->fetchOne("SELECT id FROM contacts WHERE email = ? AND id != ? AND user_id = ?", [$data['email'], $id, $username]);
    if ($emailExists) {
        echo json_encode([
            'success' => false,
            'message' => '该邮箱已存在于通讯录中'
        ]);
        return;
    }
    
    // 更新联系人
    $sql = "UPDATE contacts SET name = ?, email = ?, phone = ?, company = ?, department = ?, position = ? WHERE id = ? AND user_id = ?";
    
    $db->update($sql, [
        $data['name'],
        $data['email'],
        isset($data['phone']) ? $data['phone'] : '',
        isset($data['company']) ? $data['company'] : '',
        isset($data['department']) ? $data['department'] : '',
        isset($data['position']) ? $data['position'] : '',
        $id,
        $username
    ]);
    
    echo json_encode([
        'success' => true,
        'message' => '联系人编辑成功'
    ]);
}

/**
 * 删除联系人
 * @param Database $db 数据库实例
 */
function deleteContact($db) {
    // 获取请求参数
    $id = isset($_GET['id']) ? $_GET['id'] : '';
    $username = isset($_GET['username']) ? $_GET['username'] : '';
    
    // 验证必要参数
    if (empty($id) || empty($username)) {
        echo json_encode([
            'success' => false,
            'message' => '缺少必要参数'
        ]);
        return;
    }
    
    // 检查联系人是否存在
    $existingContact = $db->fetchOne("SELECT id FROM contacts WHERE id = ? AND user_id = ?", [$id, $username]);
    if (!$existingContact) {
        echo json_encode([
            'success' => false,
            'message' => '联系人不存在或无权访问'
        ]);
        return;
    }
    
    // 删除联系人
    $sql = "DELETE FROM contacts WHERE id = ? AND user_id = ?";
    
    $db->delete($sql, [$id, $username]);
    
    echo json_encode([
        'success' => true,
        'message' => '联系人删除成功'
    ]);
}