<?php
session_start();
if (!isset($_SESSION['user_id'])) {
    header('Location: login.php');
    exit;
}

require_once 'db/config.php';
require_once 'vendor/autoload.php';

use Shuchkin\SimpleXLSXGen;

function splitProvinciaDistrito(?string $value): array
{
    $value = trim((string)$value);
    if ($value === '') {
        return ['', ''];
    }

    $clean = preg_replace('/\s+/', ' ', $value);
    $parts = preg_split('/\s*[\/\-,|]\s*/', $clean, 2);

    if (is_array($parts) && count($parts) === 2) {
        return [trim($parts[0]), trim($parts[1])];
    }

    return [$clean, ''];
}

function extractProductNames(array $pedido): array
{
    $names = [];
    $notas = (string)($pedido['notas'] ?? '');

    if (preg_match('/Detalle de productos:\s*(.+)$/mi', $notas, $match)) {
        $items = explode(',', $match[1]);
        foreach ($items as $item) {
            $name = preg_replace('/\s*\(x\d+\)\s*$/i', '', trim($item));
            if ($name !== '') {
                $names[] = $name;
            }
        }
    }

    if (empty($names) && !empty($pedido['producto'])) {
        foreach (explode(',', (string)$pedido['producto']) as $item) {
            $name = trim($item);
            if ($name !== '') {
                $names[] = $name;
            }
        }
    }

    return array_values(array_unique($names));
}

function getEansForProducts(PDO $pdo, array $productNames): string
{
    if (empty($productNames)) {
        return '';
    }

    $placeholders = implode(',', array_fill(0, count($productNames), '?'));
    $stmt = $pdo->prepare("SELECT nombre, ean FROM products WHERE nombre IN ($placeholders)");
    $stmt->execute($productNames);

    $map = [];
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        $ean = trim((string)($row['ean'] ?? ''));
        if ($ean !== '') {
            $map[$row['nombre']] = $ean;
        }
    }

    $eans = [];
    foreach ($productNames as $name) {
        if (!empty($map[$name])) {
            $eans[] = $map[$name];
        }
    }

    return implode(' | ', array_values(array_unique($eans)));
}

try {
    $pdo = db();

    $user_id = $_SESSION['user_id'];
    $user_role = $_SESSION['user_role'] ?? 'Asesor';

    $selected_month = $_GET['mes'] ?? '';
    $selected_year = $_GET['año'] ?? '';
    $search_query = trim($_GET['q'] ?? '');

    $sql = "SELECT p.* FROM pedidos p WHERE p.estado IN ('RUTA_CONTRAENTREGA', 'PENDIENTE', 'NO CONTESTO, VOLVER A LLAMAR', 'NO CONTESTO, DEVOLVER LLAMADA', 'CANCELADO', 'REPROGRAMADO', 'ENTREGA EXITOSA', 'RETORNADO')";
    $params = [];

    if ($user_role === 'Asesor') {
        $sql .= " AND p.asesor_id = ?";
        $params[] = $user_id;
    }

    if ($search_query !== '') {
        $sql .= " AND (p.nombre_completo LIKE ? OR p.dni_cliente LIKE ? OR p.celular LIKE ?)";
        $params[] = "%$search_query%";
        $params[] = "%$search_query%";
        $params[] = "%$search_query%";
    }

    if ($selected_month !== '') {
        $sql .= " AND MONTH(p.created_at) = ?";
        $params[] = $selected_month;
    }

    if ($selected_year !== '') {
        $sql .= " AND YEAR(p.created_at) = ?";
        $params[] = $selected_year;
    }

    $sql .= " ORDER BY p.created_at DESC";
    $stmt = $pdo->prepare($sql);
    $stmt->execute($params);
    $pedidos = $stmt->fetchAll(PDO::FETCH_ASSOC);

    $rows = [];
    $rows[] = [
        'Nombre y apellido',
        'Celular',
        'Pais',
        'Departamento',
        'Provincia',
        'Distrito',
        'Direccion',
        'Referencia',
        'Coordenadas',
        'Codigo EAN',
        'Cantidad',
        'Precio',
        'Total'
    ];

    foreach ($pedidos as $pedido) {
        [$provincia, $distrito] = splitProvinciaDistrito($pedido['codigo_rastreo'] ?? '');
        $cantidad = (int)($pedido['cantidad'] ?? 0);
        $total = (float)($pedido['monto_total'] ?? 0);
        $precio = $cantidad > 0 ? round($total / $cantidad, 2) : 0;
        $ean = getEansForProducts($pdo, extractProductNames($pedido));

        $rows[] = [
            (string)($pedido['nombre_completo'] ?? ''),
            (string)($pedido['celular'] ?? ''),
            'Perú',
            (string)($pedido['sede_envio'] ?? ''),
            $provincia,
            $distrito,
            (string)($pedido['direccion_exacta'] ?? ''),
            (string)($pedido['referencia_domicilio'] ?? ''),
            (string)($pedido['coordenadas'] ?? ''),
            (string)$ean,
            $cantidad,
            $precio,
            $total
        ];
    }

    $filename = 'ruta_contraentrega_' . date('Y-m-d_H-i') . '.xlsx';
    SimpleXLSXGen::fromArray($rows, 'Ruta Contraentrega')->downloadAs($filename);
    exit;
} catch (Throwable $e) {
    error_log('Error exportando Ruta Contraentrega: ' . $e->getMessage());
    header('HTTP/1.1 500 Internal Server Error');
    echo 'Error al generar el Excel de Ruta Contraentrega.';
}