<?php

namespace Zoomyboy\Social\Classes;

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

class InstagramService extends SocialService {

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

    public function refresh(Page $page): void
    {
        $response = $this->client()->get('/refresh_access_token', ['query' => [
            'grant_type' => 'ig_refresh_token',
            'access_token' => $page->access_token,
        ]]);

        $page->update([
            'access_token' => json_decode((string) $response->getBody())->access_token
        ]);
    }

    public function client()
    {
        return new Client([
            'base_uri' => 'https://graph.instagram.com',
        ]);
    }

    public function authClient()
    {
        return new Client([
            'base_uri' => 'https://api.instagram.com',
        ]);
    }

    public function authenticate(): string
    {
        $response = $this->authClient()->post('/oauth/access_token', [
            'headers' => ['Content-Type' => 'application/x-www-form-urlencoded'],
            'form_params' => [
                 'client_id' => Setting::get('instagram_client_id'),
                 'redirect_uri' => $this->redirectUri(),
                 'client_secret' => Setting::get('instagram_client_secret'),
                 'grant_type' => 'authorization_code',
                 'code' => request()->query('code')
            ]
        ]);
        $accessToken = json_decode((string) $response->getBody())->access_token;

        $response = $this->client()->get('/access_token', ['query' => [
            'grant_type' => 'ig_exchange_token',
            'client_secret' => Setting::get('instagram_client_secret'),
            'access_token' => $accessToken,
        ]]);
        return json_decode((string) $response->getBody())->access_token;
    }

    public function redirectUri(): string
    {
        return env('INSTAGRAM_REDIRECT_URI', url()->current());
    }

    public function me(string $accessToken): array
    {
        $response = $this->client()->get('/me', ['query' => [
            'access_token' => $accessToken,
            'fields' => 'id,username',
        ]]);

        return json_decode((string) $response->getBody(), true);
    }

    public function clientId(): ?string
    {
        return Setting::get('instagram_client_id');
    }

    public function posts(): Generator
    {
        $response = $this->client()->get('/me/media', ['query' => ['access_token' => $this->page->access_token, 'fields' => 'caption,id,media_url,permalink,timestamp']]);

        $posts = json_decode((string) $response->getBody(), true)['data'];

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

            yield [
                'message' => data_get($post, 'caption', ''),
                'remote_id' => $post['id'],
                'href' => $post['permalink'],
                'created_at' => Carbon::parse($post['timestamp']),
                'attachments' => [
                    [
                        'type' => 'image',
                        'href' => $this->saveUrl($post['media_url']),
                        'remote_id' => $post['id'],
                    ]
                ],
            ];
        }
    }

}