<?php
/**
 * 人员任职公司列表接口  GET /api/person/companies.php
 * 入参：person_id（必填）/ page / limit
 * 返回：该人员任职的公司列表（公司名称/部门/岗位/职级/入职日期/是否在岗）
 */
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');
}

$stmt = $pdo->prepare(
    "SELECT COUNT(*) FROM person_work_experiences pwe
     INNER JOIN companies c ON c.id = pwe.company_id
     WHERE pwe.person_id = ? AND pwe.is_active = 1"
);
$stmt->execute([$personId]);
$total = (int)$stmt->fetchColumn();

$offset = ($page - 1) * $limit;
$stmt = $pdo->prepare(
    "SELECT pwe.id AS work_id, pwe.company_id,
            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,
            c.industry, pwe.department, pwe.position, pwe.job_level,
            pwe.start_date, pwe.end_date, pwe.is_current
     FROM person_work_experiences pwe
     INNER JOIN companies c ON c.id = pwe.company_id
     WHERE pwe.person_id = ? AND pwe.is_active = 1
     ORDER BY pwe.is_current DESC, pwe.start_date DESC
     LIMIT $limit OFFSET $offset"
);
$stmt->execute([$personId]);
$list = $stmt->fetchAll();

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