<?php
// 保存讨论区文案到本地（避免重复），不进行过期清理
header('Content-Type: application/json; charset=utf-8');

function respond($ok, $message = '', $path = '') {
    echo json_encode(['success' => $ok, 'message' => $message, 'path' => $path], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    exit;
}

$raw = file_get_contents('php://input');
$data = json_decode($raw, true);
$text = trim($data['text'] ?? '');
$source = trim($data['source'] ?? '');
if ($text === '') { respond(false, '文本为空'); }

// 根目录
$textsRoot = __DIR__ . '/../texts';
if (!is_dir($textsRoot)) { @mkdir($textsRoot, 0777, true); }
// 按来源（/后缀，即 yiyan/dujitang/renjian 等）创建子目录
$safeSource = preg_replace('/[^A-Za-z0-9._-]+/u', '_', $source ?: 'unknown');
$safeSource = trim($safeSource, '._-');
if ($safeSource === '') { $safeSource = 'unknown'; }

// 日期目录
$today = (new DateTime('now'))->format('Y-m-d');
$targetDir = $textsRoot . '/' . $safeSource . '/' . $today;
if (!is_dir($targetDir)) { @mkdir($targetDir, 0777, true); }

// 改为保存到同一天的单个文件 all.json
$targetPath = $targetDir . '/all.json';

// 读取已有数据
$entries = [];
if (file_exists($targetPath)) {
    $rawJson = @file_get_contents($targetPath);
    $decoded = json_decode($rawJson, true);
    if (is_array($decoded)) { $entries = $decoded; }
}

// 重复检查：文本完全相同则认为重复
foreach ($entries as $e) {
    if (isset($e['text']) && trim((string)$e['text']) === $text) {
        respond(true, '文本已存在，跳过保存', str_replace($_SERVER['DOCUMENT_ROOT'], '', $targetPath));
    }
}

$entries[] = [
    'text' => $text,
    'source' => $source,
    'created_at' => (new DateTime('now'))->format(DateTime::ATOM),
];

try {
    $json = json_encode($entries, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
    if (@file_put_contents($targetPath, $json, LOCK_EX) === false) {
        respond(false, '无法写入文件');
    }
} catch (Throwable $e) {
    respond(false, '保存失败: ' . $e->getMessage());
}

respond(true, '保存成功', str_replace($_SERVER['DOCUMENT_ROOT'], '', $targetPath));