<?php

namespace app\api\controller;

use think\Db;

/**
 * 用户端 · 收藏与关注（Module-FAVORITE）
 * 路由：
 *   GET  /api/v1/favorite/list    收藏的信息分页列表
 *   POST /api/v1/favorite/toggle  收藏/取消收藏信息
 *   POST /api/v1/follow/toggle    关注/取消关注用户
 *   POST /api/v1/favorite/status  批量查询收藏/关注状态
 *
 * 数据表：fa_fc_favorite(user_id,post_id,createtime) / fa_fc_follow(user_id,target_user_id,createtime)
 * 两表均有唯一索引，所有写入「先查后写 + catch 兜底」，保证并发下**幂等**。
 */
class Favorite extends V1
{
    /**
     * GET /api/v1/favorite/list  {page,size}
     *   →  分页 {list,page,size,total,hasMore}（list 项为 Post 结构，与信息流同构）
     * 规则：仅本人收藏；只返回 audit_status=1 且 status=1 且未软删的信息；按收藏时间倒序。
     */
    public function list()
    {
        $user = $this->auth();

        // 闭包重建查询：TP5.0 的 count() 会清空 Query::options，不能复用同一对象
        list($rows, $total, $page, $size) = $this->pageQuery(function ($forCount) use ($user) {
            $q = Db::name('fc_favorite')->alias('f')
                ->join('fc_post p', 'p.id = f.post_id')
                ->where('f.user_id', $user['id'])
                ->where('p.audit_status', 1)
                ->where('p.status', 1)
                ->whereNull('p.deletetime');
            if ($forCount) {
                return $q;
            }
            return $q->field('p.*')->order('f.createtime desc, f.id desc');
        });

        $builder = new Post();
        $list = [];
        foreach ($rows as $row) {
            // 复用 Post 的信息结构，保证「我的收藏」与首页信息流字段完全一致
            $list[] = $builder->buildPost($row);
        }

        $this->ok($this->paginate($list, $total, $page, $size));
    }

    /**
     * POST /api/v1/favorite/toggle  {postId}
     *   →  {faved,count}
     * faved=true 表示本次操作后为「已收藏」；count 为该信息当前收藏总数。
     */
    public function toggle()
    {
        $user = $this->auth();
        $postId = (int)$this->input('postId', 0);

        $post = $postId > 0 ? Db::name('fc_post')->where('id', $postId)->whereNull('deletetime')->find() : null;
        if (!$post) {
            $this->fail('信息不存在', 404);
        }

        $exist = Db::name('fc_favorite')->where('user_id', $user['id'])->where('post_id', $postId)->find();
        $faved = false;
        if ($exist) {
            Db::name('fc_favorite')->where('id', $exist['id'])->delete();
        } else {
            try {
                Db::name('fc_favorite')->insert([
                    'user_id'    => $user['id'],
                    'post_id'    => $postId,
                    'createtime' => time(),
                ]);
                $faved = true;
            } catch (\Exception $e) {
                // 并发下唯一索引冲突：视为已收藏（幂等）
                $faved = true;
            }
        }

        $count = (int)Db::name('fc_favorite')->where('post_id', $postId)->count();
        $this->ok(['faved' => $faved, 'count' => $count]);
    }

    /**
     * GET /api/v1/follow/list  {page,size}
     *   →  分页 {list,page,size,total,hasMore}
     * 返回当前登录用户关注的用户/商家列表
     *
     * @return void
     */
    public function followList()
    {
        $user = $this->auth();

        list($rows, $total, $page, $size) = $this->pageQuery(function ($forCount) use ($user) {
            $q = Db::name('fc_follow')->where('user_id', $user['id']);
            if ($forCount) {
                return $q;
            }
            return $q->order('id desc');
        });

        $list = [];
        foreach ($rows as $row) {
            $targetId = (int)$row['target_user_id'];
            $targetUser = Db::name('user')->where('id', $targetId)->find();
            if (!$targetUser) {
                continue;
            }
            $ext = Db::name('fc_user_ext')->where('user_id', $targetId)->find();
            $merchant = Db::name('fc_merchant')->where('user_id', $targetId)->find();
            $isMerchant = $merchant && (int)$merchant['audit_status'] === 1;

            // 统计该用户发布的有效信息条数
            $postCount = (int)Db::name('fc_post')
                ->where('user_id', $targetId)
                ->where('status', 1)
                ->where('audit_status', 1)
                ->whereNull('deletetime')
                ->count();

            $list[] = [
                'id'           => (int)$row['id'],
                'userId'       => $targetId,
                'nickname'     => (string)($merchant && $merchant['name'] ? $merchant['name'] : $targetUser['nickname']),
                'avatar'       => (string)($merchant && $merchant['logo'] ? $merchant['logo'] : $targetUser['avatar']),
                'isMerchant'   => $isMerchant,
                'merchantId'   => $merchant ? (int)$merchant['id'] : 0,
                'category'     => (string)($merchant && $merchant['category'] ? $merchant['category'] : ''),
                'postCount'    => $postCount,
                'followed'     => true,
                'followTime'   => $this->iso($row['createtime']),
            ];
        }

        $this->ok($this->paginate($list, $total, $page, $size));
    }

    /**
     * POST /api/v1/follow/toggle  {userId}
     *   →  {followed}
     * 规则：不能关注自己 → fail('不能关注自己')；目标用户必须存在。
     */
    public function follow()
    {
        $user = $this->auth();
        $targetUserId = (int)$this->input('userId', 0);

        if ($targetUserId <= 0) {
            $this->fail('用户不存在', 404);
        }
        if ($targetUserId === (int)$user['id']) {
            $this->fail('不能关注自己');
        }
        $target = Db::name('user')->where('id', $targetUserId)->find();
        if (!$target) {
            $this->fail('用户不存在', 404);
        }

        $exist = Db::name('fc_follow')
            ->where('user_id', $user['id'])
            ->where('target_user_id', $targetUserId)
            ->find();
        $followed = false;
        if ($exist) {
            Db::name('fc_follow')->where('id', $exist['id'])->delete();
        } else {
            try {
                Db::name('fc_follow')->insert([
                    'user_id'        => $user['id'],
                    'target_user_id' => $targetUserId,
                    'createtime'     => time(),
                ]);
                $followed = true;
            } catch (\Exception $e) {
                // 并发下唯一索引冲突：视为已关注（幂等）
                $followed = true;
            }
        }

        $this->ok(['followed' => $followed]);
    }

    /**
     * POST /api/v1/favorite/status  {postIds:[],userIds:[]}
     *   →  {faved:{postId:true|false},followed:{userId:true|false}}
     * 说明：批量查询（参照「详情页进入时一次性拿状态」）；
     *      入参为空数组时返回**空对象** {}（(object) 强转，避免 PHP 空数组被序列化成 []）；
     *      查询结果按请求的 id 全量回填（未收藏/未关注为 false）。
     */
    public function status()
    {
        $user = $this->auth();

        $faved = [];
        foreach ($this->idArray('postIds') as $postId) {
            $faved[(string)$postId] = false;
        }
        if ($faved) {
            $rows = Db::name('fc_favorite')
                ->where('user_id', $user['id'])
                ->where('post_id', 'in', array_keys($faved))
                ->column('post_id');
            foreach ($rows as $postId) {
                $faved[(string)$postId] = true;
            }
        }

        $followed = [];
        foreach ($this->idArray('userIds') as $userId) {
            $followed[(string)$userId] = false;
        }
        if ($followed) {
            $rows = Db::name('fc_follow')
                ->where('user_id', $user['id'])
                ->where('target_user_id', 'in', array_keys($followed))
                ->column('target_user_id');
            foreach ($rows as $userId) {
                $followed[(string)$userId] = true;
            }
        }

        $this->ok([
            'faved'    => (object)$faved,
            'followed' => (object)$followed,
        ]);
    }

    /**
     * 入参 ID 数组归一化（支持数组 / JSON 字符串 / 逗号串）
     * @param string $key
     * @return array 去重后的正整数 ID 列表（上限 200，避免超长 IN）
     */
    protected function idArray($key)
    {
        $val = $this->input($key, []);
        if (is_string($val)) {
            $decoded = json_decode($val, true);
            $val = is_array($decoded) ? $decoded : explode(',', $val);
        }
        if (!is_array($val)) {
            return [];
        }
        $ids = [];
        foreach ($val as $item) {
            $item = (int)$item;
            if ($item > 0) {
                $ids[] = $item;
            }
        }
        return array_slice(array_values(array_unique($ids)), 0, 200);
    }
}