<?php

namespace Zoomyboy\Social\Classes;

use Carbon\Carbon;
use Generator;
use GuzzleHttp\Client;
use Zoomyboy\Social\Models\Page;
use Zoomyboy\Social\Models\Post;

class FacebookService extends SocialService {

    private $baseUri = 'https://graph.facebook.com';
    protected $client;
    protected $page;
    protected $version = 'v11.0';
    protected $media;

    public function __construct() {
        parent::__construct();

        $this->client = new Client([ 'http_errors' => false, 'base_uri' => $this->baseUri ]);
    }

    public function getType(): string
    {
        return 'facebook';
    }

    public function posts(): Generator
    {
        $response = $this->client->get("/{$this->version}/{$this->page->remote_id}/published_posts", [
            'query' => [
                'access_token' => $this->page->access_token,
                'fields' => 'id,created_time,full_picture,message,attachments'
            ],
        ]);
        $posts = data_get(json_decode((string) $response->getBody(), true), 'data', []);

        foreach ($posts as $post) {
            if (!data_get($post, 'message')) {
                continue;
            }

            if (!data_get($post, 'attachments')) {
                continue;
            }

            yield [
                'message' => $post['message'],
                'remote_id' => $post['id'],
                'href' => data_get($post, 'attachments.data.0.target.url'),
                'created_at' => Carbon::parse($post['created_time']),
                'attachments' => $this->getAttachments(data_get($post, 'attachments.data')),
            ];
        }
    }

    private function getAttachments(array $data): Generator {
        foreach($data as $i => $attachment) {
            $fid = null;

            switch($attachment['type']) {
                case 'photo':
                case 'video_inline':
                    $href = $this->saveUrl(data_get($attachment, 'media.image.src')); break;
                case 'share':
                case 'event':
                    $fid = data_get($attachment, '0.target.id', data_get($attachment, 'target.id', substr(base64_encode(json_encode($attachment)), 0, 20)));
                    if (!data_get($attachment, 'media.image.src')) {
                        continue 2;
                    }
                    $href = $this->saveUrl(data_get($attachment, 'media.image.src'), $fid.'.jpg');
                    break;
                case 'album':
                    $href = $this->saveUrl(data_get($attachment, 'subattachments.data.0.media.image.src')); break;
                case 'multi_share':
                    $href = $this->saveUrl(data_get($attachment, 'subattachments.data.0.media.image.src')); break;
                case 'native_templates': continue 2;
                default:
                    throw new \Exception('I dont know how to parse attachment of type '.$attachment['type']);
            }

            $fid = $fid ?: data_get($attachment, 'target.id', '');
            yield [
                'type' => $attachment['type'],
                'href' => $href,
                'remote_id' => $fid,
            ];
        }
    }

}