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

if ($_SERVER['REQUEST_METHOD'] !== 'POST' || !isset($_POST['id'])) {
    header('Location: ngo_dashboard.php');
    exit();
}

$id = filter_input(INPUT_POST, 'id', FILTER_VALIDATE_INT);

if ($id === false) {
    header('Location: ngo_dashboard.php?status=error');
    exit();
}

// Simulate a logged-in NGO by fetching the first one
try {
    $pdo = db();
    $sql_ngo = "SELECT id FROM ngos ORDER BY id ASC LIMIT 1";
    $stmt_ngo = $pdo->query($sql_ngo);
    $ngo = $stmt_ngo->fetch(PDO::FETCH_ASSOC);
    if (!$ngo) {
        throw new Exception('No NGOs found in the database. Please register an NGO first.');
    }
    $ngo_id = $ngo['id'];
} catch (Exception $e) {
    // error_log($e->getMessage());
    header('Location: ngo_dashboard.php?status=no_ngo');
    exit();
}

try {
    $pdo = db();
    // Check if the listing is still available before claiming
    $checkSql = "SELECT status FROM food_listings WHERE id = :id";
    $checkStmt = $pdo->prepare($checkSql);
    $checkStmt->bindParam(':id', $id, PDO::PARAM_INT);
    $checkStmt->execute();
    $currentStatus = $checkStmt->fetchColumn();

    if ($currentStatus === 'available') {
        $updateSql = "UPDATE food_listings SET status = 'claimed', ngo_id = :ngo_id WHERE id = :id";
        $updateStmt = $pdo->prepare($updateSql);
        $updateStmt->bindParam(':ngo_id', $ngo_id, PDO::PARAM_INT);
        $updateStmt->bindParam(':id', $id, PDO::PARAM_INT);

        if ($updateStmt->execute()) {
            header('Location: ngo_dashboard.php?status=claimed');
        } else {
            header('Location: ngo_dashboard.php?status=error');
        }
    } else {
        // The listing was already claimed by someone else
        header('Location: ngo_dashboard.php?status=already_claimed');
    }

} catch (PDOException $e) {
    // error_log($e->getMessage());
    header('Location: ngo_dashboard.php?status=error');
}

exit();