<?php

namespace app\api\controller;

use think\Db;

/**
 * 用户端 · 首页与展示（Module-HOME）
 * 路由：
 *   GET /api/v1/home/banners        H1 轮播广告位
 *   GET /api/v1/home/categories     H2 分类导航
 *   GET /api/v1/home/search/hot     H3 热门搜索
 *   GET /api/v1/home/feed           H4 信息流
 */
class Home extends V1
{
    /**
     * H1 首页轮播广告位
     * GET /api/v1/home/banners  →  [{id,title,image,link,color}]
     * 规则：仅 enabled=1，按 sort asc；image 为空返回 ''
     */
    public function banners()
    {
        $rows = Db::name('fc_banner')
            ->where('enabled', 1)
            ->order('sort asc')
            ->select();

        $list = [];
        foreach ($rows as $row) {
            $list[] = [
                'id'    => (int)$row['id'],
                'title' => (string)$row['title'],
                'image' => (string)$row['image'],
                'link'  => (string)$row['link'],
                'color' => (string)$row['color'],
            ];
        }
        $this->ok($list);
    }

    /**
     * H2 分类导航
     * GET /api/v1/home/categories  →  [{id,name,iconKey,icon,color,count}]
     * 规则：仅 enabled=1，按 sort asc；icon 为固定 /static/icons/ 文件名（按 id 映射）
     */
    public function categories()
    {
        $rows = Db::name('fc_category')
            ->where('enabled', 1)
            ->order('sort asc')
            ->select();

        $list = [];
        foreach ($rows as $row) {
            $id = (int)$row['id'];
            $list[] = [
                'id'      => $id,
                'name'    => (string)$row['name'],
                'iconKey' => (string)$row['icon_key'],
                'icon'    => '/static/icons/' . $this->iconFile($id),
                'color'   => (string)$row['color'],
                'count'   => (int)$row['post_count'],
            ];
        }
        $this->ok($list);
    }

    /**
     * H3 热门搜索
     * GET /api/v1/home/search/hot  →  [string]
     * 规则：读配置 home.hotKeywords，未配置则返回默认
     */
    public function hotKeywords()
    {
        $default = ['租房 一室一厅', '二手电动车', '急招快递员', '钢琴家教', '空调维修'];
        $keywords = $this->cfg('home.hotKeywords', $default);
        if (!is_array($keywords) || !$keywords) {
            $keywords = $default;
        }
        $this->ok(array_values($keywords));
    }

    /**
     * H4 信息流
     * GET /api/v1/home/feed  {categoryId?,keyword?,area?,sort?,page,size}
     *   →  {list,page,size,total,hasMore}
     * 规则：仅 audit_status=1 AND status=1 AND deletetime IS NULL
     */
    public function feed()
    {
        list($page, $size) = $this->pager();

        $categoryId = (int)$this->input('categoryId', 0);
        $keyword = trim((string)$this->input('keyword', ''));
        $area = trim((string)$this->input('area', ''));
        $sort = (string)$this->input('sort', '');

        $query = Db::name('fc_post')
            ->where('audit_status', 1)
            ->where('status', 1)
            ->whereNull('deletetime');
        if ($categoryId > 0) {
            $query->where('category_id', $categoryId);
        }
        if ($keyword !== '') {
            $query->where('title', 'like', '%' . $keyword . '%');
        }
        if ($area !== '') {
            $query->where('area', $area);
        }
        if ($sort === 'price') {
            $query->order('price asc');
        } elseif ($sort === 'hot') {
            $query->order('views desc');
        } else {
            $query->order('createtime desc');
        }

        $counter = Db::name('fc_post')
            ->where('audit_status', 1)
            ->where('status', 1)
            ->whereNull('deletetime');
        if ($categoryId > 0) {
            $counter->where('category_id', $categoryId);
        }
        if ($keyword !== '') {
            $counter->where('title', 'like', '%' . $keyword . '%');
        }
        if ($area !== '') {
            $counter->where('area', $area);
        }
        $total = $counter->count();

        $rows = $query->page($page, $size)->select();

        $list = [];
        foreach ($rows as $row) {
            $list[] = $this->buildPost($row);
        }

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

    /**
     * 组装 Post 结构（与前端 mock 数据字段严格对齐）
     * @param array $row fc_post 行
     * @return array
     */
    protected function buildPost($row)
    {
        $categoryName = '';
        if (!empty($row['category_id'])) {
            $cat = Db::name('fc_category')->where('id', $row['category_id'])->find();
            if ($cat) {
                $categoryName = (string)$cat['name'];
            }
        }

        $publisher = ['id' => 0, 'name' => '', 'avatar' => '', 'isMerchant' => false, 'verified' => false];
        if (!empty($row['user_id'])) {
            $pub = Db::name('user')->where('id', $row['user_id'])->find();
            if ($pub) {
                $pubExt = Db::name('fc_user_ext')->where('user_id', $pub['id'])->find();
                $isMerchant = $pubExt && (int)$pubExt['user_type'] === 2;
                $publisher = [
                    'id'         => (int)$pub['id'],
                    'name'       => (string)$pub['nickname'],
                    'avatar'     => (string)$pub['avatar'],
                    'isMerchant' => (bool)$isMerchant,
                    'verified'   => (bool)$isMerchant,
                ];
            }
        }

        $tags = [];
        if (!empty($row['tags'])) {
            foreach (explode(',', (string)$row['tags']) as $tag) {
                $tag = trim($tag);
                if ($tag !== '') {
                    $tags[] = $tag;
                }
            }
        }

        return [
            'id'           => (int)$row['id'],
            'categoryId'   => (int)$row['category_id'],
            'categoryName' => $categoryName,
            'title'        => (string)$row['title'],
            'content'      => (string)$row['content'],
            'cover'        => (string)$row['cover'],
            'price'        => (float)$row['price'],
            'priceUnit'    => (string)$row['price_unit'],
            'area'         => (string)$row['area'],
            'address'      => (string)$row['address'],
            'contact'      => $this->maskPhone($row['phone']),
            'views'        => (int)$row['views'],
            'likes'        => (int)$row['likes'],
            'isPaid'       => (int)$row['is_paid'] === 1,
            'auditStatus'  => (int)$row['audit_status'],
            'createdAt'    => $this->iso($row['createtime']),
            'tags'         => $tags,
            'publisher'    => $publisher,
            'commentCount' => (int)$row['comment_count'],
            'distance'     => (int)$row['distance'],
        ];
    }

    /**
     * 分类 id → 固定图标文件名
     * @param int $id
     * @return string
     */
    protected function iconFile($id)
    {
        $map = [
            1 => 'cat-job.png',
            2 => 'cat-house.png',
            3 => 'cat-goods.png',
            4 => 'cat-car.png',
            5 => 'cat-service.png',
            6 => 'cat-education.png',
            7 => 'cat-clean.png',
            8 => 'cat-friend.png',
        ];
        return isset($map[$id]) ? $map[$id] : 'cat-job.png';
    }
}