<?php
/**
 * 渠道列表接口  GET/POST /api/channel/list.php
 * 参数：page / limit / keyword / channel_type / is_active
 * 数据源：channels 表（见 sql/system_tables.sql 第5节）
 */
require_once __DIR__ . '/../common/db.php';
require_once __DIR__ . '/../common/response.php';
require_once __DIR__ . '/../common/auth.php';

checkPermission('channel');

[$page, $limit] = pageParams();
$keyword = trim($_REQUEST['keyword'] ?? '');
$type    = trim($_REQUEST['channel_type'] ?? '');
$active  = isset($_REQUEST['is_active']) && $_REQUEST['is_active'] !== '' ? (int)$_REQUEST['is_active'] : null;

$where  = ['is_active = 1'];
$params = [];
if ($active !== null) {
    $where = ['is_active = ?'];
    $params = [$active];
}
if ($keyword !== '') {
    $where[] = '(channel_name LIKE ? OR contact_person LIKE ? OR contact_phone LIKE ? OR contact_email LIKE ?)';
    $like = "%$keyword%";
    array_push($params, $like, $like, $like, $like);
}
if ($type !== '') { $where[] = 'channel_type = ?'; $params[] = $type; }
$whereSql = implode(' AND ', $where);

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

$stmt = $pdo->prepare("SELECT COUNT(*) FROM channels WHERE $whereSql");
$stmt->execute($params);
$total = (int)$stmt->fetchColumn();

$offset = ($page - 1) * $limit;
$stmt = $pdo->prepare(
    "SELECT id, channel_name, channel_type, contact_person, contact_phone, contact_email,
            efficiency_score, remark, is_active, created_at, updated_at
     FROM channels
     WHERE $whereSql
     ORDER BY id DESC
     LIMIT $limit OFFSET $offset"
);
$stmt->execute($params);
$list = $stmt->fetchAll();

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