<?php
/**
 * 企业员工列表接口  GET /api/company/employees.php
 * 入参：company_id（必填）/ page / limit / keyword（姓名）/ job_level（职级）
 * 数据源：persons JOIN person_work_experiences（按公司），联系方式取 social_accounts
 */
require_once __DIR__ . '/../common/db.php';
require_once __DIR__ . '/../common/response.php';
require_once __DIR__ . '/../common/auth.php';

checkPermission('company');

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

[$page, $limit] = pageParams(10);
$keyword  = trim($_REQUEST['keyword'] ?? '');
$jobLevel = trim($_REQUEST['job_level'] ?? '');

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

// 公司存在性校验
$chk = $pdo->prepare("SELECT COUNT(*) FROM companies WHERE id = ?");
$chk->execute([$companyId]);
if ((int)$chk->fetchColumn() === 0) {
    Response::error('企业不存在');
}

$where  = ['pwe.company_id = ?', 'pwe.is_active = 1'];
$params = [$companyId];
if ($keyword !== '') {
    $where[] = 'p.full_name LIKE ?';
    $params[] = "%$keyword%";
}
if ($jobLevel !== '') {
    $where[] = 'pwe.job_level = ?';
    $params[] = $jobLevel;
}
if (isset($_REQUEST['is_current']) && $_REQUEST['is_current'] !== '') {
    $where[] = 'pwe.is_current = ?';
    $params[] = (int)$_REQUEST['is_current'] ? 1 : 0;
}
$whereSql = implode(' AND ', $where);

// 总数
$stmt = $pdo->prepare(
    "SELECT COUNT(*) FROM person_work_experiences pwe
     INNER JOIN persons p ON p.id = pwe.person_id
     WHERE $whereSql"
);
$stmt->execute($params);
$total = (int)$stmt->fetchColumn();

// 列表
$offset = ($page - 1) * $limit;
$stmt = $pdo->prepare(
    "SELECT p.id AS person_id, p.full_name, pwe.id AS work_id, pwe.position, pwe.department,
            pwe.job_level, pwe.start_date, pwe.end_date, pwe.is_current,
            (SELECT sa.account_id FROM social_accounts sa
             WHERE sa.owner_type = 'person' AND sa.owner_id = p.id AND sa.platform = 'phone' AND sa.is_active = 1
             ORDER BY sa.is_primary DESC LIMIT 1) AS phone,
            (SELECT sa.account_id FROM social_accounts sa
             WHERE sa.owner_type = 'person' AND sa.owner_id = p.id AND sa.platform = 'email' AND sa.is_active = 1
             ORDER BY sa.is_primary DESC LIMIT 1) AS email
     FROM person_work_experiences pwe
     INNER JOIN persons p ON p.id = pwe.person_id
     WHERE $whereSql
     ORDER BY pwe.is_current DESC, pwe.start_date DESC
     LIMIT $limit OFFSET $offset"
);
$stmt->execute($params);
$list = $stmt->fetchAll();

// 职级字典（该公司范围内，供筛选下拉）
$lv = $pdo->prepare(
    "SELECT DISTINCT job_level FROM person_work_experiences
     WHERE company_id = ? AND is_active = 1 AND job_level IS NOT NULL AND job_level <> ''
     ORDER BY job_level"
);
$lv->execute([$companyId]);
$levels = $lv->fetchAll(PDO::FETCH_COLUMN);

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