<?php
/**
 * 补全 t_expert 缺失的 field_ai 相关字段（可重复执行）
 * 用法: php sql/patch_expert_field_ai_columns.php
 */
$config = require __DIR__ . '/../application/database.php';

$dsn = sprintf(
    'mysql:host=%s;port=%s;dbname=%s;charset=%s',
    $config['hostname'],
    $config['hostport'],
    $config['database'],
    $config['charset']
);
$pdo = new PDO($dsn, $config['username'], $config['password'], [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
]);

$table = $config['prefix'] . 'expert';
$cols = $pdo->query("SHOW COLUMNS FROM `{$table}`")->fetchAll(PDO::FETCH_COLUMN, 0);
$colSet = array_flip($cols);

$alters = [];
if (!isset($colSet['field_ai'])) {
    $alters[] = "ADD COLUMN `field_ai` VARCHAR(512) NOT NULL DEFAULT '' COMMENT 'AI总结的主要研究领域(中文)' AFTER `affiliation`";
}
if (!isset($colSet['field_ai_status'])) {
    $after = isset($colSet['field_ai']) || !empty($alters) ? 'field_ai' : 'affiliation';
    $alters[] = "ADD COLUMN `field_ai_status` TINYINT NOT NULL DEFAULT 0 COMMENT '0待处理 1已生成 2资料不足 3失败 4无user待AI' AFTER `{$after}`";
}
if (!isset($colSet['field_ai_utime'])) {
    $alters[] = "ADD COLUMN `field_ai_utime` INT NOT NULL DEFAULT 0 COMMENT 'field_ai更新时间' AFTER `field_ai_status`";
}
if (!isset($colSet['field_ai_source'])) {
    $alters[] = "ADD COLUMN `field_ai_source` VARCHAR(32) NOT NULL DEFAULT '' COMMENT '来源: user_link / ai' AFTER `field_ai_utime`";
}

if (empty($alters)) {
    echo "OK: all field_ai columns exist on {$table}\n";
    exit(0);
}

$sql = "ALTER TABLE `{$table}` " . implode(', ', $alters);
echo "Running: {$sql}\n";
$pdo->exec($sql);
echo "Done.\n";