<?php

namespace App\Module\Friend\Services;

use App\Module\Friend\Enums\ERROR_CODE;
use App\Module\Friend\Enums\FRIEND_STATUS;
use App\Module\Friend\Enums\READ_STATUS;
use App\Module\Friend\Enums\REQUEST_STATUS;
use App\Module\Friend\Logics\Friend as FriendLogic;
use App\Module\Friend\Logics\Request as RequestLogic;
use App\Module\Friend\Models\FriendRelation;
use App\Module\Friend\Models\FriendRequest;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Collection;

/**
 * 好友服务类
 *
 * 提供好友模块的对外服务接口，包括好友添加、删除、查询等功能。
 * 该类是好友模块与其他模块交互的桥梁，所有方法均为静态方法。
 */
class FriendService
{
    /**
     * 获取用户的好友列表
     *
     * @param int $userId 用户ID
     * @param int $page 页码
     * @param int $limit 每页数量
     * @param array $filters 过滤条件
     * @return array 好友列表数据
     */
    public static function getFriendList(int $userId, int $page = 1, int $limit = 20, array $filters = []): array
    {
        $logic = new FriendLogic();
        $result = $logic->getFriendList($userId, $page, $limit, $filters);

        return [
            'code' => ERROR_CODE::SUCCESS,
            'message' => '获取成功',
            'data' => $result
        ];
    }

    /**
     * 搜索可添加为好友的用户
     *
     * @param int $userId 当前用户ID
     * @param string $keyword 搜索关键词
     * @param int $page 页码
     * @param int $limit 每页数量
     * @return array 搜索结果
     */
    public static function searchUsers(int $userId, string $keyword, int $page = 1, int $limit = 20): array
    {
        $logic = new FriendLogic();
        $result = $logic->searchUsers($userId, $keyword, $page, $limit);

        return [
            'code' => ERROR_CODE::SUCCESS,
            'message' => '搜索成功',
            'data' => $result
        ];
    }

    /**
     * 发送好友申请
     *
     * @param int $senderId 发送者ID
     * @param int $receiverId 接收者ID
     * @param string|null $message 申请消息
     * @return array 操作结果
     */
    public static function sendFriendRequest(int $senderId, int $receiverId, ?string $message = null): array
    {
        // 参数验证
        if ($senderId === $receiverId) {
            return [
                'code' => ERROR_CODE::PARAM_ERROR,
                'message' => '不能添加自己为好友'
            ];
        }

        $logic = new RequestLogic();
        $result = $logic->sendFriendRequest($senderId, $receiverId, $message);

        if ($result['success']) {
            return [
                'code' => ERROR_CODE::SUCCESS,
                'message' => '申请发送成功'
            ];
        } else {
            return [
                'code' => $result['code'],
                'message' => $result['message']
            ];
        }
    }

    /**
     * 获取收到的好友申请列表
     *
     * @param int $userId 用户ID
     * @param int $page 页码
     * @param int $limit 每页数量
     * @return array 申请列表数据
     */
    public static function getReceivedRequests(int $userId, int $page = 1, int $limit = 20): array
    {
        $logic = new RequestLogic();
        $result = $logic->getReceivedRequests($userId, $page, $limit);

        return [
            'code' => ERROR_CODE::SUCCESS,
            'message' => '获取成功',
            'data' => $result
        ];
    }

    /**
     * 获取发送的好友申请列表
     *
     * @param int $userId 用户ID
     * @param int $page 页码
     * @param int $limit 每页数量
     * @return array 申请列表数据
     */
    public static function getSentRequests(int $userId, int $page = 1, int $limit = 20): array
    {
        $logic = new RequestLogic();
        $result = $logic->getSentRequests($userId, $page, $limit);

        return [
            'code' => ERROR_CODE::SUCCESS,
            'message' => '获取成功',
            'data' => $result
        ];
    }

    /**
     * 同意好友申请
     *
     * @param int $userId 当前用户ID
     * @param int $requestId 申请ID
     * @return array 操作结果
     */
    public static function acceptFriendRequest(int $userId, int $requestId): array
    {
        $logic = new RequestLogic();
        $result = $logic->acceptFriendRequest($userId, $requestId);

        if ($result['success']) {
            return [
                'code' => ERROR_CODE::SUCCESS,
                'message' => '已同意好友申请',
                'data' => $result['data'] ?? null
            ];
        } else {
            return [
                'code' => $result['code'],
                'message' => $result['message']
            ];
        }
    }

    /**
     * 拒绝好友申请
     *
     * @param int $userId 当前用户ID
     * @param int $requestId 申请ID
     * @return array 操作结果
     */
    public static function rejectFriendRequest(int $userId, int $requestId): array
    {
        $logic = new RequestLogic();
        $result = $logic->rejectFriendRequest($userId, $requestId);

        if ($result['success']) {
            return [
                'code' => ERROR_CODE::SUCCESS,
                'message' => '已拒绝好友申请'
            ];
        } else {
            return [
                'code' => $result['code'],
                'message' => $result['message']
            ];
        }
    }

    /**
     * 删除好友
     *
     * @param int $userId 当前用户ID
     * @param int $friendId 好友ID
     * @return array 操作结果
     */
    public static function deleteFriend(int $userId, int $friendId): array
    {
        $logic = new FriendLogic();
        $result = $logic->deleteFriend($userId, $friendId);

        if ($result['success']) {
            return [
                'code' => ERROR_CODE::SUCCESS,
                'message' => '好友删除成功'
            ];
        } else {
            return [
                'code' => $result['code'],
                'message' => $result['message']
            ];
        }
    }

    /**
     * 更新好友备注
     *
     * @param int $userId 当前用户ID
     * @param int $friendId 好友ID
     * @param string $remark 备注名
     * @return array 操作结果
     */
    public static function updateFriendRemark(int $userId, int $friendId, string $remark): array
    {
        $logic = new FriendLogic();
        $result = $logic->updateFriendRemark($userId, $friendId, $remark);

        if ($result['success']) {
            return [
                'code' => ERROR_CODE::SUCCESS,
                'message' => '备注更新成功'
            ];
        } else {
            return [
                'code' => $result['code'],
                'message' => $result['message']
            ];
        }
    }
    /**
     * 检查是否是好友关系
     *
     * @param int $userId 用户ID
     * @param int $targetId 目标用户ID
     * @return bool 是否是好友
     */
    public static function isFriend(int $userId, int $targetId): bool
    {
        return FriendRelation::where('user_id', $userId)
            ->where('friend_id', $targetId)
            ->exists();
    }

    /**
     * 获取好友数量
     *
     * @param int $userId 用户ID
     * @return int 好友数量
     */
    public static function getFriendCount(int $userId): int
    {
        return FriendRelation::where('user_id', $userId)->count();
    }
}