<?php

namespace app\admin\controller;

use think\Db;
use think\Request;
use think\Session;

/**
 * 客服管理控制器
 * Class Chat
 * @package app\admin\controller
 */
class Chat extends Common
{
    /**
     * 客服工作台
     */
    public function index()
    {
        $user_info = Session::get('user_info');
        $admin_id = $user_info['id'];

        // 从数据库获取最新的login_token（避免session中没有的情况）
        $admin = Db::name('admin')->where('id', $admin_id)->field('login_token')->find();
        $login_token = $admin['login_token'] ?? '';

        // 如果没有login_token，生成一个新的
        if (empty($login_token)) {
            $login_token = md5($admin_id . time() . uniqid());
            Db::name('admin')->where('id', $admin_id)->update(['login_token' => $login_token]);
        }

        // 获取客服配置
        $admin_status = Db::name('chat_admin_status')->where('admin_id', $admin_id)->find();
        if (!$admin_status) {
            // 创建默认配置
            Db::name('chat_admin_status')->insert([
                'admin_id' => $admin_id,
                'max_sessions' => 10,
                'is_enabled' => 1,
                'create_time' => time(),
                'update_time' => time(),
            ]);
            $admin_status = ['max_sessions' => 10, 'is_enabled' => 1];
        }

        $this->assign('admin_status', $admin_status);
        $this->assign('admin_id', $admin_id);
        $this->assign('login_token', $login_token);

        return $this->fetch();
    }

    /**
     * 获取会话列表 (AJAX)
     */
    public function sessions()
    {
        $user_info = Session::get('user_info');
        $admin_id = $user_info['id'];
        $status = Request::instance()->get('status', 1); // 默认进行中

        $where = ['admin_id' => $admin_id];
        if ($status !== 'all') {
            $where['status'] = (int)$status;
        }

        $sessions = Db::name('chat_session')
            ->where($where)
            ->order('last_msg_time desc, create_time desc')
            ->select();

        foreach ($sessions as &$session) {
            // 获取用户信息
            $user = Db::name('user')->where('id', $session['user_id'])->find();
            $session['user_info'] = [
                'username' => $user['username'] ?? '',
                'nickname' => $user['nickname'] ?? $user['username'] ?? '',
                'money' => $user['money'] ?? 0,
            ];

            // 未读消息数
            $session['unread_count'] = Db::name('chat_message')
                ->where('session_id', $session['id'])
                ->where('sender_type', 1) // 用户发送
                ->where('status', '<', 3) // 未读
                ->count();

            // 格式化时间
            $session['create_time_fmt'] = date('Y-m-d H:i:s', $session['create_time']);
            $session['last_msg_time_fmt'] = $session['last_msg_time'] ? date('H:i', $session['last_msg_time']) : '';

            // 来源
            $sourceMap = [1 => 'PC', 2 => 'Game', 3 => 'Portal'];
            $session['source_name'] = $sourceMap[$session['source']] ?? 'Unknown';
        }

        return json(['code' => 0, 'data' => $sessions]);
    }

    /**
     * 获取待分配会话列表 (AJAX)
     */
    public function pending()
    {
        $sessions = Db::name('chat_session')
            ->where('status', 0) // 待分配
            ->order('create_time asc')
            ->select();

        foreach ($sessions as &$session) {
            $user = Db::name('user')->where('id', $session['user_id'])->find();
            $session['user_info'] = [
                'username' => $user['username'] ?? '',
                'nickname' => $user['nickname'] ?? $user['username'] ?? '',
                'money' => $user['money'] ?? 0,
            ];
            $session['create_time_fmt'] = date('Y-m-d H:i:s', $session['create_time']);
            $sourceMap = [1 => 'PC', 2 => 'Game', 3 => 'Portal'];
            $session['source_name'] = $sourceMap[$session['source']] ?? 'Unknown';
        }

        return json(['code' => 0, 'data' => $sessions]);
    }

    /**
     * 获取消息历史 (AJAX)
     */
    public function messages()
    {
        $session_id = Request::instance()->get('session_id');
        $last_id = Request::instance()->get('last_id', 0);
        $limit = Request::instance()->get('limit', 50);

        if (!$session_id) {
            return json(['code' => 1, 'msg' => '参数错误']);
        }

        $query = Db::name('chat_message')->where('session_id', $session_id);
        if ($last_id > 0) {
            $query->where('id', '<', $last_id);
        }

        $messages = $query->order('id desc')->limit($limit)->select();
        $messages = array_reverse($messages); // 按时间正序

        foreach ($messages as &$msg) {
            $msg['create_time_fmt'] = date('H:i:s', $msg['create_time']);
        }

        return json(['code' => 0, 'data' => $messages]);
    }

    /**
     * 结束会话 (AJAX)
     */
    public function endSession()
    {
        $session_id = Request::instance()->post('session_id');
        $user_info = Session::get('user_info');

        if (!$session_id) {
            return json(['code' => 1, 'msg' => '参数错误']);
        }

        $session = Db::name('chat_session')->where('id', $session_id)->find();
        if (!$session || $session['admin_id'] != $user_info['id']) {
            return json(['code' => 1, 'msg' => '无权操作']);
        }

        Db::name('chat_session')->where('id', $session_id)->update([
            'status' => 2,
            'end_time' => time(),
            'update_time' => time(),
        ]);

        insertAdminLog('结束客服会话', '会话ID: ' . $session_id);

        return json(['code' => 0, 'msg' => '操作成功']);
    }

    /**
     * 手动接入会话 (AJAX)
     */
    public function acceptSession()
    {
        $session_id = Request::instance()->post('session_id');
        $user_info = Session::get('user_info');
        $admin_id = $user_info['id'];

        if (!$session_id) {
            return json(['code' => 1, 'msg' => '参数错误']);
        }

        // 检查会话是否存在且状态为待分配
        $session = Db::name('chat_session')->where('id', $session_id)->find();
        if (!$session) {
            return json(['code' => 1, 'msg' => '会话不存在']);
        }
        if ($session['status'] != 0) {
            return json(['code' => 1, 'msg' => '该会话已被接入']);
        }

        // 检查客服当前会话数是否已满
        $admin_status = Db::name('chat_admin_status')->where('admin_id', $admin_id)->find();
        $max_sessions = $admin_status['max_sessions'] ?? 10;
        $current_sessions = Db::name('chat_session')
            ->where('admin_id', $admin_id)
            ->where('status', 1)
            ->count();

        if ($current_sessions >= $max_sessions) {
            return json(['code' => 1, 'msg' => '已达最大会话数限制(' . $max_sessions . ')']);
        }

        // 接入会话
        $result = Db::name('chat_session')->where('id', $session_id)->where('status', 0)->update([
            'admin_id' => $admin_id,
            'status' => 1,
            'update_time' => time(),
        ]);

        if ($result) {
            insertAdminLog('接入客服会话', '会话ID: ' . $session_id);
            return json(['code' => 0, 'msg' => '接入成功']);
        } else {
            return json(['code' => 1, 'msg' => '接入失败，可能已被其他客服接入']);
        }
    }

    /**
     * 转接会话 (AJAX)
     */
    public function transfer()
    {
        $session_id = Request::instance()->post('session_id');
        $target_admin_id = Request::instance()->post('target_admin_id');
        $user_info = Session::get('user_info');

        if (!$session_id || !$target_admin_id) {
            return json(['code' => 1, 'msg' => '参数错误']);
        }

        $session = Db::name('chat_session')->where('id', $session_id)->find();
        if (!$session || $session['admin_id'] != $user_info['id']) {
            return json(['code' => 1, 'msg' => '无权操作']);
        }

        Db::name('chat_session')->where('id', $session_id)->update([
            'admin_id' => $target_admin_id,
            'update_time' => time(),
        ]);

        insertAdminLog('转接客服会话', '会话ID: ' . $session_id . ', 转接给: ' . $target_admin_id);

        return json(['code' => 0, 'msg' => '转接成功']);
    }

    /**
     * 获取在线客服列表 (AJAX)
     */
    public function onlineAgents()
    {
        $user_info = Session::get('user_info');

        // 获取启用客服功能的管理员
        $agents = Db::name('chat_admin_status')
            ->alias('s')
            ->join('admin a', 'a.id = s.admin_id')
            ->where('s.is_enabled', 1)
            ->where('a.id', '<>', $user_info['id'])
            ->field('a.id, a.admin as username, a.admin as nickname, s.max_sessions')
            ->select();

        return json(['code' => 0, 'data' => $agents]);
    }

    /**
     * 聊天记录查询
     */
    public function record()
    {
        $get = Request::instance()->get();
        $this->assign('get', $get);

        $username = Request::instance()->get('username');
        $admin_id = Request::instance()->get('admin_id');
        $startDate = Request::instance()->get('startDate');
        $endDate = Request::instance()->get('endDate');
        $export = Request::instance()->get('export');

        $where = [];
        $startTime = 0;
        $endTime = time();

        if ($startDate) $startTime = strtotime($startDate);
        if ($endDate) $endTime = strtotime($endDate) + 86400;
        $where['s.create_time'] = ['between', [$startTime, $endTime]];

        if ($admin_id) {
            $where['s.admin_id'] = $admin_id;
        }

        $query = Db::name('chat_session')
            ->alias('s')
            ->join('user u', 'u.id = s.user_id', 'left')
            ->join('admin a', 'a.id = s.admin_id', 'left')
            ->where($where);

        if ($username) {
            $query->where('u.username', 'like', "%{$username}%");
        }

        if ($export == 1) {
            $list = $query->field('s.*, u.username, u.nickname as user_nickname, a.admin as admin_username')
                ->order('s.create_time desc')
                ->select();

            $excelData = [];
            foreach ($list as $k => $v) {
                $excelData[$k][0] = $v['id'];
                $excelData[$k][1] = $v['username'];
                $excelData[$k][2] = $v['admin_username'] ?? '未分配';
                $excelData[$k][3] = ['PC', 'Game', 'Portal'][$v['source'] - 1] ?? '';
                $excelData[$k][4] = ['待分配', '进行中', '已结束'][$v['status']] ?? '';
                $excelData[$k][5] = $v['rating'] ?? '-';
                $excelData[$k][6] = date('Y-m-d H:i:s', $v['create_time']);
                $excelData[$k][7] = $v['end_time'] ? date('Y-m-d H:i:s', $v['end_time']) : '-';
            }
            $title = ['会话ID', '用户名', '客服', '来源', '状态', '评分', '开始时间', '结束时间'];
            $this->exportExcelCore($excelData, '聊天记录-' . date('Ymd'), $title);
            exit;
        }

        $list = $query->field('s.*, u.username, u.nickname as user_nickname, a.admin as admin_username')
            ->order('s.create_time desc')
            ->paginate(15, false, ['query' => $get]);

        // 获取客服列表
        $admins = Db::name('admin')->where('status', 1)->field('id, admin as username, admin as nickname')->select();

        $this->assign('list', $list);
        $this->assign('admins', $admins);

        return $this->fetch();
    }

    /**
     * 查看会话详情
     */
    public function detail()
    {
        $session_id = Request::instance()->get('session_id');

        $session = Db::name('chat_session')
            ->alias('s')
            ->join('user u', 'u.id = s.user_id', 'left')
            ->join('admin a', 'a.id = s.admin_id', 'left')
            ->where('s.id', $session_id)
            ->field('s.*, u.username, u.nickname as user_nickname, u.money, a.admin as admin_username')
            ->find();

        if (!$session) {
            $this->error('会话不存在');
        }

        $messages = Db::name('chat_message')
            ->where('session_id', $session_id)
            ->order('id asc')
            ->select();

        $this->assign('session', $session);
        $this->assign('messages', $messages);

        return $this->fetch();
    }

    /**
     * 客服统计
     */
    public function stats()
    {
        $user_info = Session::get('user_info');
        $admin_id = Request::instance()->get('admin_id', $user_info['id']);
        $startDate = Request::instance()->get('startDate', date('Y-m-d', strtotime('-7 days')));
        $endDate = Request::instance()->get('endDate', date('Y-m-d'));

        $startTime = strtotime($startDate);
        $endTime = strtotime($endDate) + 86400;

        $where = [
            'admin_id' => $admin_id,
            'create_time' => ['between', [$startTime, $endTime]],
        ];

        // 统计数据
        $stats = [
            'total_sessions' => Db::name('chat_session')->where($where)->count(),
            'ended_sessions' => Db::name('chat_session')->where($where)->where('status', 2)->count(),
            'avg_rating' => Db::name('chat_session')->where($where)->whereNotNull('rating')->avg('rating') ?: 0,
            'total_messages' => Db::name('chat_message')
                ->alias('m')
                ->join('chat_session s', 's.id = m.session_id')
                ->where('s.admin_id', $admin_id)
                ->where('m.create_time', 'between', [$startTime, $endTime])
                ->count(),
        ];

        $this->assign('stats', $stats);
        $this->assign('startDate', $startDate);
        $this->assign('endDate', $endDate);

        return $this->fetch();
    }

    /**
     * 获取快捷回复列表 (AJAX)
     */
    public function quickReplies()
    {
        $category = Request::instance()->get('category');

        $query = Db::name('chat_quick_reply')->where('status', 1);
        if ($category) {
            $query->where('category', $category);
        }

        $list = $query->order('sort asc, id asc')->select();
        $categories = Db::name('chat_quick_reply')
            ->where('status', 1)
            ->whereNotNull('category')
            ->where('category', '<>', '')
            ->group('category')
            ->column('category');

        return json(['code' => 0, 'data' => $list, 'categories' => $categories]);
    }

    /**
     * 图片上传
     */
    public function upload()
    {
        $file = Request::instance()->file('image');
        if (!$file) {
            return json(['code' => 1, 'msg' => '请选择文件']);
        }

        // 验证文件
        $info = $file->validate([
            'size' => 2097152, // 2MB
            'ext' => 'jpg,png,gif,jpeg'
        ])->move(ROOT_PATH . 'public/uploads/chat/' . date('Ymd'));

        if ($info) {
            $url = '/uploads/chat/' . date('Ymd') . '/' . $info->getSaveName();
            return json(['code' => 0, 'url' => $url]);
        } else {
            return json(['code' => 1, 'msg' => $file->getError()]);
        }
    }
}