<?php
// JARVIS Email endpoint — IMAP reader for Gmail, Outlook, iCloud.
// GET  ?action=email                    → recent + unread summary (cached 5 min)
// GET  ?action=email&account=gmail      → Gmail only
// GET  ?action=email&force=1            → bypass cache, fetch live
// GET  ?action=email&search=from:john   → search emails

function imapFetch(string $host, string $user, string $pass, int $maxMsgs = 10): array {
    if (!$user || !$pass) return ['error' => 'not_configured'];

    $mbox = @imap_open($host, $user, $pass, 0, 1, ['DISABLE_AUTHENTICATOR' => 'GSSAPI']);
    if (!$mbox) return ['error' => imap_last_error() ?: 'connection_failed'];

    $total   = imap_num_msg($mbox);
    $unseen  = imap_search($mbox, 'UNSEEN') ?: [];
    $unread  = count($unseen);

    // Fetch most recent messages (newest first)
    $start   = max(1, $total - $maxMsgs + 1);
    $msgs    = [];
    for ($i = $total; $i >= $start; $i--) {
        $hdr   = @imap_headerinfo($mbox, $i);
        if (!$hdr) continue;

        $from  = $hdr->from[0] ?? null;
        $fromName  = $from ? (isset($from->personal) ? imap_utf8($from->personal) : '') : '';
        $fromEmail = $from ? ($from->mailbox . '@' . ($from->host ?? '')) : '';
        $subject   = isset($hdr->subject) ? imap_utf8($hdr->subject) : '(no subject)';
        $date      = isset($hdr->date)    ? date('M j g:ia', strtotime($hdr->date)) : '';
        $isUnread  = in_array($i, $unseen);

        // Fetch plain text preview (first 300 chars)
        $preview = '';
        $struct  = @imap_fetchstructure($mbox, $i);
        if ($struct) {
            if ($struct->type === 0) {
                // Single-part message
                $raw = @imap_fetchbody($mbox, $i, '1');
                $enc = $struct->encoding ?? 0;
                if ($enc === 3)      $raw = base64_decode($raw);
                elseif ($enc === 4)  $raw = quoted_printable_decode($raw);
                $preview = mb_substr(strip_tags($raw), 0, 300);
            } else {
                // Multi-part — find first text/plain part
                foreach (($struct->parts ?? []) as $idx => $part) {
                    if ($part->type === 0) { // text
                        $raw = @imap_fetchbody($mbox, $i, (string)($idx + 1));
                        $enc = $part->encoding ?? 0;
                        if ($enc === 3)      $raw = base64_decode($raw);
                        elseif ($enc === 4)  $raw = quoted_printable_decode($raw);
                        $preview = mb_substr(strip_tags($raw), 0, 300);
                        break;
                    }
                }
            }
        }
        $preview = trim(preg_replace('/\s+/', ' ', $preview));

        $msgs[] = [
            'id'        => $i,
            'from_name' => $fromName ?: $fromEmail,
            'from_email'=> $fromEmail,
            'subject'   => $subject,
            'date'      => $date,
            'unread'    => $isUnread,
            'preview'   => $preview,
        ];
    }

    imap_close($mbox);
    return ['total' => $total, 'unread' => $unread, 'messages' => $msgs];
}

$account = $data['account'] ?? $_GET['account'] ?? 'all';
$force   = !empty($data['force']) || !empty($_GET['force']);
$search  = trim($data['search'] ?? $_GET['search'] ?? '');

$cacheKey = 'email_' . $account;
$cacheTtl = 300; // 5 minutes

if (!$force) {
    $cached = JarvisDB::single(
        "SELECT data, UNIX_TIMESTAMP(updated_at) ts FROM api_cache WHERE cache_key=?",
        [$cacheKey]
    );
    if ($cached && (time() - (int)$cached['ts']) < $cacheTtl) {
        $out = json_decode($cached['data'], true);
        $out['cache_age_s'] = time() - (int)$cached['ts'];
        echo json_encode($out);
        exit;
    }
}

$result = ['accounts' => [], 'summary' => []];

if (in_array($account, ['all', 'gmail']) && defined('GMAIL_USER') && GMAIL_USER) {
    $r = imapFetch('{imap.gmail.com:993/imap/ssl}INBOX', GMAIL_USER, GMAIL_PASS);
    $result['accounts']['gmail'] = $r;
}

if (in_array($account, ['all', 'outlook']) && defined('OUTLOOK_USER') && OUTLOOK_USER) {
    $r = imapFetch('{outlook.office365.com:993/imap/ssl}INBOX', OUTLOOK_USER, OUTLOOK_PASS);
    $result['accounts']['outlook'] = $r;
}

if (in_array($account, ['all', 'icloud']) && defined('ICLOUD_USER') && ICLOUD_USER) {
    $r = imapFetch('{imap.mail.me.com:993/imap/ssl}INBOX', ICLOUD_USER, ICLOUD_PASS);
    $result['accounts']['icloud'] = $r;
}

// Build summary across all accounts
$totalUnread = 0;
$allMessages = [];
foreach ($result['accounts'] as $acct => $r) {
    if (isset($r['unread'])) $totalUnread += (int)$r['unread'];
    if (!empty($r['messages'])) {
        foreach ($r['messages'] as $m) {
            $m['account'] = $acct;
            $allMessages[] = $m;
        }
    }
}

// Sort by date descending (approximate — already newest first per account)
$result['summary'] = [
    'total_unread' => $totalUnread,
    'recent'       => array_slice($allMessages, 0, 10),
    'fetched_at'   => date('c'),
];

// Cache result
JarvisDB::execute(
    "INSERT INTO api_cache (cache_key, data, updated_at) VALUES (?,?,NOW())
     ON DUPLICATE KEY UPDATE data=VALUES(data), updated_at=NOW()",
    [$cacheKey, json_encode($result)]
);

$result['cache_age_s'] = 0;
echo json_encode($result);