<?php
require_once '../config.php';

$method = $_SERVER['REQUEST_METHOD'];

switch ($method) {
    case 'GET':
        // Get all staff
        try {
            // Also try to add phone and preferences columns if they don't exist
            try { $pdo->exec("ALTER TABLE staff ADD COLUMN phone VARCHAR(20) DEFAULT NULL"); } catch (Exception $e) {}
            try { $pdo->exec("ALTER TABLE staff ADD COLUMN pref_weekdays VARCHAR(50) DEFAULT NULL"); } catch (Exception $e) {}
            try { $pdo->exec("ALTER TABLE staff ADD COLUMN pref_weekend VARCHAR(10) DEFAULT NULL"); } catch (Exception $e) {}
            
            $stmt = $pdo->query("SELECT id, name, phone, pref_weekdays, pref_weekend FROM staff ORDER BY id ASC");
            $staff = $stmt->fetchAll();
            echo json_encode(['status' => 'success', 'data' => $staff]);
        } catch (PDOException $e) {
            http_response_code(500);
            echo json_encode(['status' => 'error', 'message' => $e->getMessage()]);
        }
        break;

    case 'PUT':
    case 'POST':
        // Add or Update staff name, phone, and preferences
        $input = json_decode(file_get_contents('php://input'), true);
        
        if (!isset($input['name'])) {
            http_response_code(400);
            echo json_encode(['status' => 'error', 'message' => 'Missing name']);
            exit;
        }

        try {
            $phone = isset($input['phone']) ? $input['phone'] : null;
            $pref_weekdays = isset($input['pref_weekdays']) ? $input['pref_weekdays'] : null;
            $pref_weekend = isset($input['pref_weekend']) ? $input['pref_weekend'] : null;
            
            if (isset($input['id']) && $input['id']) {
                // Update existing
                $stmt = $pdo->prepare("UPDATE staff SET name = :name, phone = :phone, pref_weekdays = :pref_weekdays, pref_weekend = :pref_weekend WHERE id = :id");
                $stmt->execute([
                    ':name' => $input['name'],
                    ':phone' => $phone,
                    ':pref_weekdays' => $pref_weekdays,
                    ':pref_weekend' => $pref_weekend,
                    ':id' => $input['id']
                ]);
                echo json_encode(['status' => 'success', 'message' => 'Staff updated successfully']);
            } else {
                // Insert new
                $stmt = $pdo->prepare("INSERT INTO staff (name, phone, pref_weekdays, pref_weekend) VALUES (:name, :phone, :pref_weekdays, :pref_weekend)");
                $stmt->execute([
                    ':name' => $input['name'],
                    ':phone' => $phone,
                    ':pref_weekdays' => $pref_weekdays,
                    ':pref_weekend' => $pref_weekend
                ]);
                $newId = $pdo->lastInsertId();
                echo json_encode(['status' => 'success', 'message' => 'Staff added successfully', 'id' => $newId]);
            }
        } catch (PDOException $e) {
            http_response_code(500);
            echo json_encode(['status' => 'error', 'message' => $e->getMessage()]);
        }
        break;

    case 'DELETE':
        $input = json_decode(file_get_contents('php://input'), true);
        if (!isset($input['id'])) {
            http_response_code(400);
            echo json_encode(['status' => 'error', 'message' => 'Missing id']);
            exit;
        }
        try {
            // Delete staff
            $stmt = $pdo->prepare("DELETE FROM staff WHERE id = :id");
            $stmt->execute([':id' => $input['id']]);
            
            // Delete related schedules
            $stmt = $pdo->prepare("DELETE FROM schedules WHERE staff_id = :id");
            $stmt->execute([':id' => $input['id']]);
            
            // Delete related oncall
            $stmt = $pdo->prepare("DELETE FROM oncall_days WHERE staff_id = :id");
            $stmt->execute([':id' => $input['id']]);

            echo json_encode(['status' => 'success', 'message' => 'Staff deleted successfully']);
        } catch (PDOException $e) {
            http_response_code(500);
            echo json_encode(['status' => 'error', 'message' => $e->getMessage()]);
        }
        break;

    default:
        http_response_code(405);
        echo json_encode(['status' => 'error', 'message' => 'Method not allowed']);
        break;
}
?>