<?php

namespace App\Services;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;

class CourierService
{
    protected string $apiKey;
    protected string $baseUrl;

    public function __construct()
    {
        $this->apiKey = config('courier.api_key');
        $this->baseUrl = config('courier.api_base_url', 'https://api.shiplogic.com/api');
    }

    /**
     * Create a shipment with Shiplogic
     * 
     * @param string $orderId
     * @param float $width Width in cm
     * @param float $length Length in cm
     * @param float $weight Weight in kg
     * @return array{shipment_id: string, waybill_id: string, tracking_number: string}
     * @throws \Exception
     */
    public function createShipment(string $orderId, float $width, float $length, float $weight): array
    {
        if (! $this->isConfigured()) {
            throw new \Exception('Courier API not configured');
        }

        if ($width <= 0 || $length <= 0 || $weight <= 0) {
            throw new \Exception('Invalid dimensions or weight: all must be greater than 0');
        }

        try {
            // Build shipment payload for Shiplogic
            $payload = [
                'parcel' => [
                    'weight' => $weight,
                    'height' => 10, // TODO: Update when height is captured separately
                    'width' => $width,
                    'length' => $length,
                ],
                'destination' => [
                    // TODO: Get from order's shipping address
                ],
                'reference' => $orderId,
            ];

            $response = Http::withHeaders([
                'Authorization' => "Bearer {$this->apiKey}",
            ])->post("{$this->baseUrl}/shipments", $payload);

            if (! $response->successful()) {
                $errorMessage = $response->json('error.message', 'Unknown error');
                throw new \Exception("Courier API error: {$errorMessage}");
            }

            $data = $response->json();

            return [
                'shipment_id' => $data['id'] ?? null,
                'waybill_id' => $data['waybill_number'] ?? null,
                'tracking_number' => $data['tracking_number'] ?? null,
            ];
        } catch (\Exception $e) {
            Log::error('Failed to create shipment with courier', [
                'order_id' => $orderId,
                'error' => $e->getMessage(),
            ]);

            throw $e;
        }
    }

    /**
     * Fetch shipping label/sticker PDF from Shiplogic
     */
    public function fetchSticker(string $shipmentId, string $orderId): ?string
    {
        if (! $this->isConfigured()) {
            return null;
        }

        try {
            $response = Http::withHeaders([
                'Authorization' => "Bearer {$this->apiKey}",
            ])->get("{$this->baseUrl}/shipments/{$shipmentId}/sticker");

            if ($response->successful()) {
                $path = "shipments/{$orderId}/sticker.pdf";
                Storage::disk('public')->put($path, $response->body());

                return $path;
            }

            Log::warning('Failed to fetch sticker from courier', ['shipment_id' => $shipmentId]);

            return null;
        } catch (\Exception $e) {
            Log::error('Exception fetching sticker', ['error' => $e->getMessage()]);

            return null;
        }
    }

    /**
     * Fetch waybill PDF from Shiplogic
     */
    public function fetchWaybill(string $shipmentId, string $orderId): ?string
    {
        if (! $this->isConfigured()) {
            return null;
        }

        try {
            $response = Http::withHeaders([
                'Authorization' => "Bearer {$this->apiKey}",
            ])->get("{$this->baseUrl}/shipments/{$shipmentId}/label");

            if ($response->successful()) {
                $path = "shipments/{$orderId}/waybill.pdf";
                Storage::disk('public')->put($path, $response->body());

                return $path;
            }

            Log::warning('Failed to fetch waybill from courier', ['shipment_id' => $shipmentId]);

            return null;
        } catch (\Exception $e) {
            Log::error('Exception fetching waybill', ['error' => $e->getMessage()]);

            return null;
        }
    }

    /**
     * Check if courier is configured
     */
    protected function isConfigured(): bool
    {
        return ! empty($this->apiKey);
    }
}