/**
 * ====== ARCHIVE SYSTEM ======
 */

/**
 * Get config (helper for archive system)
 */
function getConfig(): array {
    if (!defined('CONFIG_FILE')) return [];
    if (!file_exists(CONFIG_FILE)) return ['aff_id'=>'','site_name'=>'Promo Shopee'];
    return json_decode(file_get_contents(CONFIG_FILE), true) ?: ['aff_id'=>'','site_name'=>'Promo Shopee'];
}

/**
 * Save config (helper for archive system)
 */
function saveConfig(array $c): void {
    if (!defined('CONFIG_FILE')) return;
    file_put_contents(CONFIG_FILE, json_encode($c, JSON_PRETTY_PRINT));
}

/**
 * Load visits (helper)
 */
function loadVisits(): array {
    if (!defined('VISITS_FILE')) return [];
    if (!file_exists(VISITS_FILE)) return [];
    $d = json_decode(file_get_contents(VISITS_FILE), true);
    return is_array($d) ? $d : [];
}

/**
 * Load stats.json
 */
function loadStats(): array {
    $statsFile = DATA_DIR . '/stats.json';
    if (!file_exists($statsFile)) {
        return [
            'daily' => [],
            'all_time' => [
                'total_visits' => 0,
                'bot_visits' => 0,
                'user_visits' => 0,
                'headless' => 0,
                'meta_asn' => 0,
                'campaigns' => [],
                'links' => [],
                'top_ips' => []
            ]
        ];
    }
    return json_decode(file_get_contents($statsFile), true) ?: [];
}

/**
 * Save stats.json
 */
function saveStats(array $stats): void {
    $statsFile = DATA_DIR . '/stats.json';
    file_put_contents($statsFile, json_encode($stats, JSON_PRETTY_PRINT));
}

/**
 * Update daily stats with visit data
 */
function updateDailyStats(array $visits, string $date): void {
    if (empty($visits)) return;
    
    $stats = loadStats();
    
    // Calculate stats from visits
    $totalVisits = count($visits);
    $botVisits = count(array_filter($visits, fn($v) => $v['is_bot'] ?? false));
    $userVisits = $totalVisits - $botVisits;
    $headless = count(array_filter($visits, fn($v) => $v['is_headless'] ?? false));
    $metaASN = count(array_filter($visits, fn($v) => $v['is_meta_asn'] ?? false));
    
    // Top IPs
    $ipCounts = [];
    foreach ($visits as $v) {
        $ip = $v['ip'] ?? 'unknown';
        $ipCounts[$ip] = ($ipCounts[$ip] ?? 0) + 1;
    }
    arsort($ipCounts);
    $topIps = array_slice($ipCounts, 0, 10, true);
    
    // Campaigns
    $campaignCounts = [];
    foreach ($visits as $v) {
        $cid = $v['campaign_id'] ?? 'no_campaign';
        $campaignCounts[$cid] = ($campaignCounts[$cid] ?? 0) + 1;
    }
    
    // Links
    $linkCounts = [];
    foreach ($visits as $v) {
        $lid = $v['link_id'] ?? 'unknown';
        $linkCounts[$lid] = ($linkCounts[$lid] ?? 0) + 1;
    }
    
    // Store daily stats
    $stats['daily'][$date] = [
        'total_visits' => $totalVisits,
        'bot_visits' => $botVisits,
        'user_visits' => $userVisits,
        'headless' => $headless,
        'meta_asn' => $metaASN,
        'top_ips' => $topIps,
        'campaigns' => $campaignCounts,
        'links' => $linkCounts
    ];
    
    // Update all_time stats
    $stats['all_time']['total_visits'] += $totalVisits;
    $stats['all_time']['bot_visits'] += $botVisits;
    $stats['all_time']['user_visits'] += $userVisits;
    $stats['all_time']['headless'] += $headless;
    $stats['all_time']['meta_asn'] += $metaASN;
    
    // Merge campaign counts
    foreach ($campaignCounts as $cid => $count) {
        $stats['all_time']['campaigns'][$cid] = ($stats['all_time']['campaigns'][$cid] ?? 0) + $count;
    }
    
    // Merge link counts
    foreach ($linkCounts as $lid => $count) {
        $stats['all_time']['links'][$lid] = ($stats['all_time']['links'][$lid] ?? 0) + $count;
    }
    
    // Merge top IPs
    foreach ($ipCounts as $ip => $count) {
        $stats['all_time']['top_ips'][$ip] = ($stats['all_time']['top_ips'][$ip] ?? 0) + $count;
    }
    
    saveStats($stats);
}

/**
 * Check if auto-clear is needed
 */
function needsAutoClear(): bool {
    $config = getConfig();
    
    // Check if auto-clear enabled
    if (!($config['auto_clear_log'] ?? false)) {
        return false;
    }
    
    // Check last clear timestamp
    $lastClear = $config['last_auto_clear'] ?? '';
    $today = date('Y-m-d');
    
    // Check if target time passed
    $targetTime = $config['auto_clear_time'] ?? '00:00';
    $currentTime = date('H:i');
    
    // Clear if:
    // 1. Last clear != today
    // 2. Current time >= target time
    return $lastClear !== $today && $currentTime >= $targetTime;
}

/**
 * Perform auto-clear with archiving
 */
function performAutoClear(): array {
    $today = date('Y-m-d');
    
    // 1. Load current visits
    $visits = loadVisits();
    
    $result = [
        'archived_count' => 0,
        'deleted_archives' => 0
    ];
    
    if (!empty($visits)) {
        // 2. Archive current visits.json
        $archiveDir = DATA_DIR . '/archives';
        if (!is_dir($archiveDir)) {
            mkdir($archiveDir, 0755, true);
        }
        
        $archiveFile = $archiveDir . "/visits_{$today}.json";
        
        // Merge with existing archive if exists
        $existingArchive = [];
        if (file_exists($archiveFile)) {
            $existingArchive = json_decode(file_get_contents($archiveFile), true) ?: [];
        }
        
        $mergedArchive = array_merge($existingArchive, $visits);
        file_put_contents($archiveFile, json_encode($mergedArchive, JSON_PRETTY_PRINT));
        
        $result['archived_count'] = count($visits);
        
        // 3. Update stats.json with today's data
        updateDailyStats($visits, $today);
        
        // 4. Clear visits.json
        file_put_contents(VISITS_FILE, '[]');
    }
    
    // 5. Cleanup old archives (> 7 days)
    $config = getConfig();
    $retentionDays = $config['archive_retention_days'] ?? 7;
    $result['deleted_archives'] = cleanupOldArchives($retentionDays);
    
    // 6. Update last_auto_clear timestamp
    $config['last_auto_clear'] = $today;
    saveConfig($config);
    
    return $result;
}

/**
 * Cleanup old archive files
 */
function cleanupOldArchives(int $retentionDays): int {
    $archiveDir = DATA_DIR . '/archives';
    if (!is_dir($archiveDir)) return 0;
    
    $cutoffDate = date('Y-m-d', strtotime("-{$retentionDays} days"));
    $deleted = 0;
    
    foreach (glob($archiveDir . '/visits_*.json') as $file) {
        // Extract date from filename: visits_2026-08-01.json
        if (preg_match('/visits_(\d{4}-\d{2}-\d{2})\.json/', basename($file), $m)) {
            $fileDate = $m[1];
            if ($fileDate < $cutoffDate) {
                unlink($file);
                $deleted++;
            }
        }
    }
    
    return $deleted;
}

/**
 * List all archive files
 */
function listArchives(): array {
    $archiveDir = DATA_DIR . '/archives';
    if (!is_dir($archiveDir)) return [];
    
    $archives = [];
    foreach (glob($archiveDir . '/visits_*.json') as $file) {
        if (preg_match('/visits_(\d{4}-\d{2}-\d{2})\.json/', basename($file), $m)) {
            $date = $m[1];
            $data = json_decode(file_get_contents($file), true) ?: [];
            $totalVisits = count($data);
            $botVisits = count(array_filter($data, fn($v) => $v['is_bot'] ?? false));
            $userVisits = $totalVisits - $botVisits;
            
            $archives[] = [
                'date' => $date,
                'filename' => basename($file),
                'filepath' => $file,
                'total_visits' => $totalVisits,
                'bot_visits' => $botVisits,
                'user_visits' => $userVisits,
                'filesize' => filesize($file)
            ];
        }
    }
    
    // Sort by date descending
    usort($archives, fn($a, $b) => $b['date'] <=> $a['date']);
    
    return $archives;
}

/**
 * Load archive file by date
 */
function loadArchive(string $date): array {
    $archiveFile = DATA_DIR . "/archives/visits_{$date}.json";
    if (!file_exists($archiveFile)) return [];
    return json_decode(file_get_contents($archiveFile), true) ?: [];
}

/**
 * Export archive to TXT format
 */
function exportArchiveToTXT(string $date): string {
    $visits = loadArchive($date);
    if (empty($visits)) return "No data for {$date}";
    
    $totalVisits = count($visits);
    $botVisits = count(array_filter($visits, fn($v) => $v['is_bot'] ?? false));
    $userVisits = $totalVisits - $botVisits;
    $headless = count(array_filter($visits, fn($v) => $v['is_headless'] ?? false));
    $metaASN = count(array_filter($visits, fn($v) => $v['is_meta_asn'] ?? false));
    
    // Calculate percentages
    $botPct = $totalVisits > 0 ? round($botVisits / $totalVisits * 100, 1) : 0;
    $userPct = $totalVisits > 0 ? round($userVisits / $totalVisits * 100, 1) : 0;
    $headlessPct = $totalVisits > 0 ? round($headless / $totalVisits * 100, 1) : 0;
    $metaPct = $totalVisits > 0 ? round($metaASN / $totalVisits * 100, 1) : 0;
    
    // Top IPs
    $ipCounts = [];
    foreach ($visits as $v) {
        $ip = $v['ip'] ?? 'unknown';
        $ipCounts[$ip] = ($ipCounts[$ip] ?? 0) + 1;
    }
    arsort($ipCounts);
    $topIps = array_slice($ipCounts, 0, 10, true);
    
    $output = "";
    $output .= "VISIT LOG ARCHIVE - {$date}\n";
    $output .= "Generated: " . date('Y-m-d H:i:s') . "\n";
    $output .= "Total Visits: {$totalVisits} ({$botVisits} bot, {$userVisits} user)\n";
    $output .= "\n";
    $output .= str_repeat("=", 80) . "\n";
    $output .= "\n";
    
    // Header
    $output .= sprintf("%-10s %-17s %-8s %-12s %-18s %-10s\n",
        "TIME", "IP", "COUNTRY", "ASN", "CLASSIFICATION", "LINK");
    $output .= str_repeat("-", 80) . "\n";
    
    // Data rows
    foreach ($visits as $v) {
        $time = substr($v['timestamp'] ?? '', 11, 8);
        $ip = $v['ip'] ?? '-';
        $country = $v['country_code'] ?? $v['country'] ?? '-';
        $asn = $v['asn'] ?? '-';
        $classification = $v['classification'] ?? 'unknown';
        $linkId = $v['link_id'] ?? '-';
        
        $output .= sprintf("%-10s %-17s %-8s %-12s %-18s %-10s\n",
            $time, $ip, $country, $asn, $classification, $linkId);
    }
    
    $output .= "\n";
    $output .= str_repeat("=", 80) . "\n";
    $output .= "\n";
    $output .= "SUMMARY:\n";
    $output .= "- Bot visits: {$botVisits} ({$botPct}%)\n";
    $output .= "- User visits: {$userVisits} ({$userPct}%)\n";
    $output .= "- Headless: {$headless} ({$headlessPct}%)\n";
    $output .= "- Meta ASN: {$metaASN} ({$metaPct}%)\n";
    $output .= "\n";
    $output .= "TOP IPs:\n";
    $rank = 1;
    foreach ($topIps as $ip => $count) {
        $output .= "{$rank}. {$ip} - {$count} visits\n";
        $rank++;
    }
    
    return $output;
}
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