<?php
/**
 * send_push.php
 * Helper function to send "Show enabled" web-push notifications from the webserver.
 *
 * Function: try_send_show_notification(string $articleRefOrJob, string $jobdir, string $mvlog_root = null, string $logfile = null): bool
 *
 * Returns true on successful send and cache update, false otherwise.
 */

function mvlog_load_push_config(string $mvlog_root): ?array
{
    $candidates = [
        '/etc/mvlog/push.php',
        '/etc/mvlog/push.json',
        $mvlog_root . '/push.json',
        (getenv('HOME') !== false ? getenv('HOME') . '/.config/mvlog/push.json' : null),
    ];

    foreach ($candidates as $candidate) {
        if (!$candidate || !is_file($candidate) || !is_readable($candidate)) continue;

        $cfg = null;
        if (str_ends_with($candidate, '.php')) {
            $loaded = @require $candidate;
            if (is_array($loaded)) $cfg = $loaded;
        } else {
            $decoded = json_decode((string)@file_get_contents($candidate), true);
            if (is_array($decoded)) $cfg = $decoded;
        }

        if (!is_array($cfg)) continue;

        $public = (string)($cfg['public_key'] ?? $cfg['vapidPublicKey'] ?? '');
        $private = (string)($cfg['private_key'] ?? $cfg['vapidPrivateKey'] ?? '');
        $subject = (string)($cfg['subject'] ?? $cfg['vapidSubject'] ?? '');

        if ($public !== '' && $private !== '') {
            return [
                'subject' => $subject,
                'public_key' => $public,
                'private_key' => $private,
                '_source' => $candidate,
            ];
        }
    }

    return null;
}

function mvlog_write_temp_push_json(array $cfg): ?string
{
    $tmp = tempnam(sys_get_temp_dir(), 'mvlog-push-');
    if ($tmp === false) return null;

    $payload = json_encode([
        'subject' => (string)($cfg['subject'] ?? ''),
        'public_key' => (string)($cfg['public_key'] ?? ''),
        'private_key' => (string)($cfg['private_key'] ?? ''),
    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

    if (!is_string($payload) || @file_put_contents($tmp, $payload, LOCK_EX) === false) {
        @unlink($tmp);
        return null;
    }

    @chmod($tmp, 0600);
    return $tmp;
}

function mvlog_nice_title(string $s): string
{
    return trim(ucwords(str_replace(['_', '-'], ' ', $s)));
}

function mvlog_article_id_is_valid(string $id): bool
{
    return (bool)preg_match('/^[0-9]{14}[a-f0-9]{16}$/', $id);
}

function mvlog_read_article_id(string $jobdir): string
{
    $path = rtrim($jobdir, '/') . '/.mvlog-id';
    if (!is_file($path)) return '';
    $value = strtolower(trim((string)@file_get_contents($path)));
    return mvlog_article_id_is_valid($value) ? $value : '';
}

function try_send_show_notification($articleRefOrJob, $jobdir, $mvlog_root = null, $logfile = null)
{
    if ($mvlog_root === null) $mvlog_root = dirname(__DIR__);
    if ($logfile === null) $logfile = '/var/log/mvlog_notify.log';

    $subs_file = $mvlog_root . '/cache/push_subscriptions.json';
    $cache_file = $mvlog_root . '/cache/push_notifications.json';

    $job = basename((string)$jobdir);
    $articleRef = strtolower(trim((string)$articleRefOrJob));
    $articleId = mvlog_article_id_is_valid($articleRef) ? $articleRef : mvlog_read_article_id((string)$jobdir);
    if ($articleId === '') {
        error_log("[mvlog] article id missing, skipping push for $job\n", 3, $logfile);
        return false;
    }
    $identity = $articleId;

    // Don't notify for hidden jobs
    if (is_file($jobdir . '/.mvlog-hidden')) {
        error_log("[mvlog] job $job hidden, skipping push\n", 3, $logfile);
        return false;
    }

    // Gather subscriptions
    if (!is_file($subs_file)) {
        error_log("[mvlog] subscriptions file missing, skipping push for $identity\n", 3, $logfile);
        return false;
    }
    $subs_raw = @file_get_contents($subs_file);
    if (!is_string($subs_raw) || trim($subs_raw) === '') {
        error_log("[mvlog] subscriptions empty, skipping push for $identity\n", 3, $logfile);
        return false;
    }
    $subs = json_decode($subs_raw, true);
    if (!is_array($subs) || count($subs) === 0) {
        error_log("[mvlog] subscriptions invalid/empty, skipping push for $identity\n", 3, $logfile);
        return false;
    }

    // Read cache and check if already shown
    $cache = [];
    if (is_file($cache_file)) {
        $cache = json_decode((string)@file_get_contents($cache_file), true) ?: [];
    }
    $shown = isset($cache['shown']) && is_array($cache['shown']) ? $cache['shown'] : [];
    // Transition support: honor both new (ID) and legacy (job name) keys.
    if (isset($shown[$identity]) || ($identity !== $job && isset($shown[$job]))) {
        error_log("[mvlog] push already sent for $identity (job=$job), skipping\n", 3, $logfile);
        return false;
    }

    // Resolve push config consistently (same source model as push_config.php)
    $cfg = mvlog_load_push_config($mvlog_root);
    if (!$cfg) {
        error_log("[mvlog] push config not found/invalid, skipping push for $identity\n", 3, $logfile);
        return false;
    }

    $tmp_push_config = mvlog_write_temp_push_json($cfg);
    if (!$tmp_push_config) {
        error_log("[mvlog] failed to create temp push config for $identity\n", 3, $logfile);
        return false;
    }

    // Determine article title (used both in notification text and filtered URL).
    $articleTitle = mvlog_nice_title((string)$job);
    if (preg_match('/^\d{8}[_-](.+)$/', (string)$job, $m)) {
        $articleTitle = mvlog_nice_title((string)$m[1]);
    }

    $state_file = $jobdir . '/.movmaker-state.json';
    if (is_file($state_file)) {
        $state = json_decode((string)@file_get_contents($state_file), true) ?: [];
        if (!empty($state['output']) && is_string($state['output'])) {
            $out = pathinfo($state['output'], PATHINFO_FILENAME);
            if ($out) {
                if (preg_match('/^\d{8}[_-](.+)$/', (string)$out, $m)) {
                    $articleTitle = mvlog_nice_title((string)$m[1]);
                } else {
                    $articleTitle = mvlog_nice_title((string)$out);
                }
            }
        }
    }

    if ($articleTitle === '') $articleTitle = mvlog_nice_title((string)$job);

    $articleUrl = is_file($jobdir . '/.mvlog-permalink') ? './?id=' . rawurlencode($articleId) : './';

    $payload = json_encode([
        'title' => $articleTitle,
        'body' => 'New unreliable article @ MVLog!',
        'url'  => $articleUrl,
        'tag'  => "mvlog-show-{$identity}",
    ], JSON_UNESCAPED_UNICODE);

    // Call node send_push.js with subscriptions on stdin
    $send_script = escapeshellarg($mvlog_root . '/send_push.js');
    $push_config_esc = escapeshellarg($tmp_push_config);
    $payload_esc = escapeshellarg((string)$payload);
    $cmd = "node $send_script $push_config_esc $payload_esc";

    $descriptorspec = [
        0 => ['pipe', 'r'], // stdin
        1 => ['pipe', 'w'], // stdout
        2 => ['pipe', 'w'], // stderr
    ];

    $proc = proc_open($cmd, $descriptorspec, $pipes);
    if (!is_resource($proc)) {
        @unlink($tmp_push_config);
        error_log("[mvlog] failed to start node send_push process for $identity\n", 3, $logfile);
        return false;
    }

    // Write subscriptions to stdin
    fwrite($pipes[0], $subs_raw);
    fclose($pipes[0]);

    $stdout = stream_get_contents($pipes[1]); fclose($pipes[1]);
    $stderr = stream_get_contents($pipes[2]); fclose($pipes[2]);

    $rc = proc_close($proc);
    @unlink($tmp_push_config);

    if ($rc !== 0) {
        error_log("[mvlog] send_push failed for $identity rc=$rc stdout=" . trim((string)$stdout) . " stderr=" . trim((string)$stderr) . "\n", 3, $logfile);
        return false;
    }

    // On success, record in cache['shown']
    if (!is_array($cache)) $cache = [];
    if (!isset($cache['shown']) || !is_array($cache['shown'])) $cache['shown'] = [];
    $cache['shown'][$identity] = [
        'sent_at' => date(DATE_ATOM),
        'job' => $job,
        'article_id' => $articleId,
    ];

    // Atomic write: write to tmp then rename
    $tmp = $cache_file . '.tmp.' . bin2hex(random_bytes(6));
    $json = json_encode($cache, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT) . "\n";
    if (@file_put_contents($tmp, $json, LOCK_EX) === false) {
        error_log("[mvlog] failed to write cache temp file for $identity\n", 3, $logfile);
        return false;
    }
    @chmod($tmp, 0664);
    if (!@rename($tmp, $cache_file)) {
        @unlink($tmp);
        error_log("[mvlog] failed to atomically write cache file for $identity\n", 3, $logfile);
        return false;
    }

    error_log("[mvlog] show-notification sent: identity=$identity job=$job (cfg=" . ($cfg['_source'] ?? 'unknown') . ")\n", 3, $logfile);
    return true;
}