<?php
/**
 * 人员相关产品品类列表接口  GET /api/person/products.php
 * 入参：person_id（必填）/ page / limit
 * 数据源：该人员任职公司的产品品类（去重）
 */
require_once __DIR__ . '/../common/db.php';
require_once __DIR__ . '/../common/response.php';
require_once __DIR__ . '/../common/auth.php';

checkPermission('person');

$personId = (int)($_REQUEST['person_id'] ?? 0);
if ($personId <= 0) {
    Response::error('参数错误', 400);
}

[$page, $limit] = pageParams(5);

$pdo = DB::getInstance()->getPdo();

$chk = $pdo->prepare("SELECT COUNT(*) FROM persons WHERE id = ?");
$chk->execute([$personId]);
if ((int)$chk->fetchColumn() === 0) {
    Response::error('人员不存在');
}

$join = "FROM person_work_experiences pwe
         INNER JOIN company_products cp ON cp.company_id = pwe.company_id AND cp.is_active = 1
         INNER JOIN companies c ON c.id = pwe.company_id
         WHERE pwe.person_id = ? AND pwe.is_active = 1";

$stmt = $pdo->prepare("SELECT COUNT(DISTINCT cp.id) $join");
$stmt->execute([$personId]);
$total = (int)$stmt->fetchColumn();

$offset = ($page - 1) * $limit;
$stmt = $pdo->prepare(
    "SELECT DISTINCT cp.id, cp.category_name, cp.category_description, cp.is_core, cp.is_active,
            CASE WHEN c.name_zh IS NOT NULL AND c.name_zh <> '' THEN c.name_zh
                 ELSE COALESCE(c.name_en, c.display_name) END AS company_name
     $join
     ORDER BY company_name, cp.id DESC
     LIMIT $limit OFFSET $offset"
);
$stmt->execute([$personId]);

Response::success(['list' => $stmt->fetchAll(), 'total' => $total, 'page' => $page, 'limit' => $limit]);