<?php
declare (strict_types = 1);

namespace app\model\api;

use library\basic\BaseModel;
use library\traits\ModelTrait;
use think\Model;

/**
 * 聊天记录模型
 * @mixin \think\Model
 */
class ChatRecord extends BaseModel
{
    use ModelTrait;
    
    protected $name = 'chat_record';
    
    // 消息类型
    const TYPE_TEXT = 1;    // 文字
    const TYPE_VOICE = 2;   // 语音
    const TYPE_IMAGE = 3;   // 图片
    
    // 未读
    const UNREAD = 0;
    // 已读
    const READ = 1;
    
    // 来源类型
    const FROM_PC = 0;      // PC端
    const FROM_WECHAT = 1;  // 微信
    const FROM_MINIAPP = 2; // 小程序
    const FROM_H5 = 3;      // H5
    
    /**
     * 保存聊天记录
     * @param int $userId 发送者ID
     * @param int $toUserId 接收者ID
     * @param string $content 消息内容
     * @param int $type 消息类型
     * @param int $formType 来源类型 0=PC, 1=微信, 2=小程序, 3=H5
     * @return self
     */
    public static function saveRecord(int $userId, int $toUserId, string $content, int $type = self::TYPE_TEXT, int $formType = self::FROM_PC): self
    {
        return self::create([
            'user_id' => $userId,
            'to_user_id' => $toUserId,
            'content' => $content,
            'type' => $type,
            'form_type' => $formType,
            'is_read' => self::UNREAD,
            'create_time' => time(),
        ]);
    }
    
    /**
     * 获取与某用户的聊天记录
     * @param int $userId 当前用户ID
     * @param int $toUserId 对方用户ID
     * @param int $page 页码
     * @param int $limit 每页数量
     * @return array
     */
    public static function getChatRecords(int $userId, int $toUserId, int $page = 1, int $limit = 20): array
    {
        $where = function ($query) use ($userId, $toUserId) {
            $query->where(function ($q) use ($userId, $toUserId) {
                $q->where('user_id', $userId)->where('to_user_id', $toUserId);
            })->whereOr(function ($q) use ($userId, $toUserId) {
                $q->where('user_id', $toUserId)->where('to_user_id', $userId);
            });
        };
        
        $data = self::where($where)
            ->order('create_time desc')
            ->page($page, $limit)
            ->select();
        
        $total = self::where($where)->count();
        
        // 标记为已读
        self::markAsRead($userId, $toUserId);
        
        return [
            'list' => $data ? array_reverse($data->toArray()) : [],
            'total' => $total,
            'page' => $page,
            'limit' => $limit,
        ];
    }
    
    /**
     * 标记消息为已读
     * @param int $userId 当前用户ID
     * @param int $fromUserId 发送者ID
     * @return bool
     */
    public static function markAsRead(int $userId, int $fromUserId): bool
    {
        return self::where('user_id', $fromUserId)
            ->where('to_user_id', $userId)
            ->where('is_read', self::UNREAD)
            ->update(['is_read' => self::READ]) !== false;
    }
    
    /**
     * 获取未读消息数
     * @param int $userId 用户ID
     * @param int|null $fromUserId 指定发送者（可选）
     * @return int
     */
    public static function getUnreadCount(int $userId, ?int $fromUserId = null): int
    {
        $where = [
            'to_user_id' => $userId,
            'is_read' => self::UNREAD,
        ];
        
        if ($fromUserId !== null) {
            $where['user_id'] = $fromUserId;
        }
        
        return self::where($where)->count();
    }
    
    /**
     * 获取所有未读消息数
     * @param int $userId 用户ID
     * @return int
     */
    public static function getTotalUnreadCount(int $userId): int
    {
        return self::where('to_user_id', $userId)
            ->where('is_read', self::UNREAD)
            ->count();
    }
    
    /**
     * 获取消息类型文本
     * @param int $type 类型
     * @return string
     */
    public static function getTypeText(int $type): string
    {
        $typeMap = [
            self::TYPE_TEXT => '文字',
            self::TYPE_VOICE => '语音',
            self::TYPE_IMAGE => '图片',
        ];
        
        return $typeMap[$type] ?? '未知';
    }
    
    /**
     * 获取来源类型文本
     * @param int $formType 来源类型
     * @return string
     */
    public static function getFormTypeText(int $formType): string
    {
        $formTypeMap = [
            self::FROM_PC => 'PC端',
            self::FROM_WECHAT => '微信',
            self::FROM_MINIAPP => '小程序',
            self::FROM_H5 => 'H5',
        ];
        
        return $formTypeMap[$formType] ?? '未知';
    }
}