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

session_start();

if (!isset($_GET['id']) || empty($_GET['id'])) {
    header("Location: contacts.php");
    exit;
}

$contact_id = $_GET['id'];

try {
    $pdo = db();

    // Check for associated deals
    $stmt = $pdo->prepare("SELECT COUNT(*) FROM deals WHERE contact_id = :contact_id");
    $stmt->bindParam(':contact_id', $contact_id, PDO::PARAM_INT);
    $stmt->execute();
    $deal_count = $stmt->fetchColumn();

    if ($deal_count > 0) {
        $_SESSION['error_message'] = "Cannot delete contact. It is associated with {$deal_count} deal(s). Please reassign or delete the deals first.";
    } else {
        // No associated deals, proceed with deletion
        $stmt = $pdo->prepare("DELETE FROM contacts WHERE id = :id");
        $stmt->bindParam(':id', $contact_id, PDO::PARAM_INT);
        
        if ($stmt->execute() && $stmt->rowCount() > 0) {
            $_SESSION['success_message'] = "Contact deleted successfully.";
        } else {
            $_SESSION['error_message'] = "Failed to delete contact or contact not found.";
        }
    }
} catch (PDOException $e) {
    $_SESSION['error_message'] = "Database error: " . $e->getMessage();
}

header("Location: contacts.php");
exit;
?>