<?php
require_once __DIR__ . '/../helpers.php';
runAuth();

/**
 * List unclaimed/pending tasks for a business
 * POST: { BusinessID: int, TaskTypeID?: int }
 */

$data = readJsonBody();
$businessID = (int) ($data['BusinessID'] ?? 0);
$taskTypeID = (int) ($data['TaskTypeID'] ?? 0);

if ($businessID <= 0) {
    apiAbort(['OK' => false, 'ERROR' => 'missing_params', 'MESSAGE' => 'BusinessID is required.']);
}

try {
    // Get business name
    $qBusiness = queryOne("SELECT Name FROM Businesses WHERE ID = ?", [$businessID]);
    $businessName = $qBusiness ? $qBusiness['Name'] : '';

    // Build WHERE clause
    $where = "t.BusinessID = ? AND t.ClaimedByUserID = 0 AND t.CompletedOn IS NULL";
    $params = [$businessID];

    if ($taskTypeID > 0) {
        $where .= " AND t.TaskTypeID = ?";
        $params[] = $taskTypeID;
    }

    $qTasks = queryTimed("
        SELECT
          t.ID, t.BusinessID, t.OrderID, t.TaskTypeID,
          t.Title, t.Details, t.CreatedOn, t.ClaimedByUserID, t.UserID,
          tt.Name AS TaskTypeName, tt.Icon AS TaskTypeIcon, tt.Color AS TaskTypeColor,
          t.ServicePointID,
          sp.Name AS ServicePointName,
          u.FirstName AS CustomerFirstName,
          u.LastName AS CustomerLastName
        FROM Tasks t
        LEFT JOIN tt_TaskTypes tt ON tt.ID = t.TaskTypeID
        LEFT JOIN Orders o ON o.ID = t.OrderID
        LEFT JOIN ServicePoints sp ON sp.ID = COALESCE(t.ServicePointID, o.ServicePointID)
        LEFT JOIN Users u ON u.ID = t.UserID
        WHERE $where
        ORDER BY t.CreatedOn ASC
    ", $params);

    $tasks = [];
    foreach ($qTasks as $row) {
        $taskTitle = !empty(trim($row['Title'] ?? ''))
            ? $row['Title']
            : ((int) $row['OrderID'] > 0 ? "Order #" . $row['OrderID'] : "Task #" . $row['ID']);

        $customerName = '';
        if (!empty(trim($row['CustomerFirstName'] ?? ''))) {
            $customerName = $row['CustomerFirstName'];
            if (!empty(trim($row['CustomerLastName'] ?? ''))) {
                $customerName .= ' ' . $row['CustomerLastName'];
            }
        }

        $tasks[] = [
            'TaskID' => (int) $row['ID'],
            'BusinessID' => (int) $row['BusinessID'],
            'TaskTypeID' => (int) $row['TaskTypeID'],
            'Title' => $taskTitle,
            'Details' => !empty(trim($row['Details'] ?? '')) ? $row['Details'] : '',
            'CreatedOn' => toISO8601($row['CreatedOn']),
            'StatusID' => (int) $row['ClaimedByUserID'] > 0 ? 1 : 0,
            'SourceType' => 'order',
            'SourceID' => (int) $row['OrderID'],
            'TaskTypeName' => !empty(trim($row['TaskTypeName'] ?? '')) ? $row['TaskTypeName'] : '',
            'TaskTypeIcon' => !empty(trim($row['TaskTypeIcon'] ?? '')) ? $row['TaskTypeIcon'] : 'notifications',
            'TaskTypeColor' => !empty(trim($row['TaskTypeColor'] ?? '')) ? $row['TaskTypeColor'] : '#9C27B0',
            'ServicePointID' => (int) ($row['ServicePointID'] ?? 0),
            'ServicePointName' => $row['ServicePointName'] ?? '',
            'CustomerID' => (int) ($row['UserID'] ?? 0),
            'CustomerName' => $customerName,
            'OrderTotal' => 0,
        ];
    }

    // Calculate OrderTotal for tasks with linked orders
    foreach ($tasks as &$task) {
        if ((int) $task['SourceID'] > 0) {
            $qOT = queryOne("
                SELECT SUM(oli.Price * oli.Quantity) AS Subtotal, o.TipAmount, o.DeliveryFee, o.OrderTypeID, b.TaxRate, b.PayfritFee
                FROM Orders o
                INNER JOIN Businesses b ON b.ID = o.BusinessID
                LEFT JOIN OrderLineItems oli ON oli.OrderID = o.ID AND oli.IsDeleted = 0
                WHERE o.ID = ?
                GROUP BY o.ID
            ", [$task['SourceID']]);
            if ($qOT) {
                $sub = (float) $qOT['Subtotal'];
                $feeRate = (is_numeric($qOT['PayfritFee']) && (float) $qOT['PayfritFee'] > 0) ? (float) $qOT['PayfritFee'] : 0.05;
                $total = $sub + ($sub * (float) $qOT['TaxRate']) + (float) $qOT['TipAmount']
                    + (((int) $qOT['OrderTypeID'] === 3) ? (float) $qOT['DeliveryFee'] : 0)
                    + ($sub * $feeRate);
                $task['OrderTotal'] = number_format($total, 2, '.', '');
            }
        }
    }
    unset($task);

    jsonResponse([
        'OK' => true,
        'ERROR' => '',
        'TASKS' => $tasks,
        'COUNT' => count($tasks),
        'BUSINESS_NAME' => $businessName,
    ]);

} catch (Exception $e) {
    jsonResponse(['OK' => false, 'ERROR' => 'server_error', 'MESSAGE' => 'Error loading tasks', 'DETAIL' => $e->getMessage()]);
}