<?php
// JARVIS Planner — tasks, appointments, daily briefing

// ── Helpers ──────────────────────────────────────────────────────────────────
function parseNaturalDate(string $text): ?string {
    $text = trim($text);
    if (!$text || strtolower($text) === 'none') return null;
    $ts = strtotime($text);
    return ($ts !== false && $ts > 0) ? date('Y-m-d', $ts) : null;
}
function parseNaturalDatetime(string $text): ?string {
    $text = trim($text);
    if (!$text) return null;
    $ts = strtotime($text);
    return ($ts !== false && $ts > 0) ? date('Y-m-d H:i:s', $ts) : null;
}

// ── Route ─────────────────────────────────────────────────────────────────────
// $action from api.php: tasks | appointments | today | done | summary

switch ($action) {

    // ── Tasks ─────────────────────────────────────────────────────────────────
    case 'tasks':
        if ($method === 'GET') {
            $status   = $_GET['status']   ?? '';
            $category = $_GET['category'] ?? '';
            $where = '1=1';
            $params = [];
            if ($status)   { $where .= ' AND status=?';   $params[] = $status; }
            if ($category) { $where .= ' AND category=?'; $params[] = $category; }
            else           { $where .= " AND status NOT IN ('done','cancelled')"; }
            $rows = JarvisDB::query(
                "SELECT * FROM tasks WHERE {$where} ORDER BY
                 FIELD(priority,'urgent','high','normal','low'), due_date ASC, created_at DESC",
                $params
            ) ?? [];
            echo json_encode(['tasks' => $rows]);
        } elseif ($method === 'POST') {
            $id       = (int)($data['id'] ?? 0);
            $title    = trim($data['title'] ?? '');
            $notes    = trim($data['notes'] ?? '');
            $category = $data['category'] ?? 'personal';
            $priority = $data['priority'] ?? 'normal';
            $status   = $data['status']   ?? 'pending';
            $due_date = parseNaturalDate($data['due_date'] ?? '');
            $due_time = !empty($data['due_time']) ? $data['due_time'] : null;
            if (!$title) { echo json_encode(['error' => 'Title required']); exit; }
            if ($id) {
                JarvisDB::execute(
                    'UPDATE tasks SET title=?,notes=?,category=?,priority=?,status=?,due_date=?,due_time=?,updated_at=NOW() WHERE id=?',
                    [$title,$notes,$category,$priority,$status,$due_date,$due_time,$id]
                );
                echo json_encode(['success' => true, 'id' => $id]);
            } else {
                $newId = JarvisDB::insert(
                    'INSERT INTO tasks (title,notes,category,priority,due_date,due_time) VALUES (?,?,?,?,?,?)',
                    [$title,$notes,$category,$priority,$due_date,$due_time]
                );
                echo json_encode(['success' => true, 'id' => $newId]);
            }
        } elseif ($method === 'DELETE') {
            $id = (int)($_GET['id'] ?? 0);
            if ($id) { JarvisDB::execute('DELETE FROM tasks WHERE id=?', [$id]); }
            echo json_encode(['success' => true]);
        }
        break;

    // ── Mark task done ────────────────────────────────────────────────────────
    case 'done':
        $id = (int)($data['id'] ?? $_GET['id'] ?? 0);
        if ($id) {
            JarvisDB::execute(
                "UPDATE tasks SET status='done', completed_at=NOW() WHERE id=?", [$id]
            );
        }
        echo json_encode(['success' => true]);
        break;

    // ── Appointments ──────────────────────────────────────────────────────────
    case 'appointments':
        if ($method === 'GET') {
            $from = $_GET['from'] ?? date('Y-m-d');
            $to   = $_GET['to']   ?? date('Y-m-d', strtotime('+90 days'));
            $rows = JarvisDB::query(
                "SELECT * FROM appointments WHERE DATE(start_at) BETWEEN ? AND ? ORDER BY start_at ASC",
                [$from, $to]
            ) ?? [];
            echo json_encode(['appointments' => $rows]);
        } elseif ($method === 'POST') {
            $id          = (int)($data['id'] ?? 0);
            $title       = trim($data['title'] ?? '');
            $description = trim($data['description'] ?? '');
            $category    = $data['category']    ?? 'personal';
            $location    = trim($data['location'] ?? '');
            $all_day     = (int)($data['all_day'] ?? 0);
            $reminder    = (int)($data['reminder_min'] ?? 30);
            $start_raw   = trim($data['start_at'] ?? '');
            $end_raw     = trim($data['end_at']   ?? '');
            if (!$title || !$start_raw) { echo json_encode(['error' => 'Title and start time required']); exit; }
            $start_at = parseNaturalDatetime($start_raw) ?? date('Y-m-d H:i:s', strtotime($start_raw));
            $end_at   = $end_raw ? (parseNaturalDatetime($end_raw) ?? null) : null;
            if ($id) {
                JarvisDB::execute(
                    'UPDATE appointments SET title=?,description=?,category=?,start_at=?,end_at=?,location=?,all_day=?,reminder_min=?,alerted=0,updated_at=NOW() WHERE id=?',
                    [$title,$description,$category,$start_at,$end_at,$location,$all_day,$reminder,$id]
                );
                echo json_encode(['success' => true, 'id' => $id]);
            } else {
                $newId = JarvisDB::insert(
                    'INSERT INTO appointments (title,description,category,start_at,end_at,location,all_day,reminder_min) VALUES (?,?,?,?,?,?,?,?)',
                    [$title,$description,$category,$start_at,$end_at,$location,$all_day,$reminder]
                );
                echo json_encode(['success' => true, 'id' => $newId]);
            }
        } elseif ($method === 'DELETE') {
            $id = (int)($_GET['id'] ?? 0);
            if ($id) { JarvisDB::execute('DELETE FROM appointments WHERE id=?', [$id]); }
            echo json_encode(['success' => true]);
        }
        break;

    // ── Today / briefing summary ──────────────────────────────────────────────
    case 'today':
    default:
        $today    = date('Y-m-d');
        $tomorrow = date('Y-m-d', strtotime('+1 day'));

        $tasks_today   = JarvisDB::query(
            "SELECT * FROM tasks WHERE due_date=? AND status NOT IN ('done','cancelled') ORDER BY FIELD(priority,'urgent','high','normal','low')",
            [$today]
        ) ?? [];
        $tasks_overdue = JarvisDB::query(
            "SELECT * FROM tasks WHERE due_date < ? AND status NOT IN ('done','cancelled') ORDER BY due_date ASC",
            [$today]
        ) ?? [];
        $tasks_pending = JarvisDB::query(
            "SELECT COUNT(*) cnt FROM tasks WHERE status='pending' AND (due_date IS NULL OR due_date >= ?)",
            [$today]
        );
        $appts_today   = JarvisDB::query(
            "SELECT * FROM appointments WHERE DATE(start_at)=? ORDER BY start_at ASC",
            [$today]
        ) ?? [];
        $appts_upcoming = JarvisDB::query(
            "SELECT * FROM appointments WHERE start_at > NOW() ORDER BY start_at ASC LIMIT 5",
            []
        ) ?? [];

        echo json_encode([
            'date'            => $today,
            'tasks_today'     => $tasks_today,
            'tasks_overdue'   => $tasks_overdue,
            'pending_count'   => (int)($tasks_pending[0]['cnt'] ?? 0),
            'appts_today'     => $appts_today,
            'appts_upcoming'  => $appts_upcoming,
        ]);
        break;
}