<?php

namespace Zoomyboy\Social\Classes;

use Event;
use Generator;
use Illuminate\Support\Collection;
use MediaLibrary;
use Zoomyboy\Social\Exceptions\SocialException;
use Zoomyboy\Social\Models\Page;
use Zoomyboy\Social\Models\Setting;

abstract class SocialService {

    protected $page;
    protected $media;

    abstract public function getType(): string;

    abstract public function posts(): Generator;

    public function __construct()
    {
        $this->media = MediaLibrary::instance();
    }

    protected function setPage(Page $page): self
    {
        $this->page = $page;

        return $this;
    }

    public function clearAll(): void
    {
        foreach ($this->pages() as $page) {
            $this->setPage($page)->clear();
        }
    }

    public function syncAll(): void
    {
        foreach ($this->pages() as $page) {
            $this->setPage($page)->sync();
        }
    }

    public function pages(): Collection
    {
        return Page::where('type', $this->getType())->get();
    }

    public function clear() {
        $this->page->delete();
    }

    public function cleanOutdated(): void
    {
        if (!is_numeric(Setting::get('max_posts'))) {
            return;
        }

        while ($this->page->posts()->count() > 0 && $this->page->posts()->count() > Setting::get('max_posts')) {
            $this->page->posts()->orderBy('created_at')->first()->delete();
        }
    }

    public function saveUrl(string $source, ?string $filename = null): string
    {
        $filename = $filename ?: pathinfo(parse_url($source, PHP_URL_PATH), PATHINFO_BASENAME);

        if (!pathinfo($filename, PATHINFO_FILENAME)) {
            throw new SocialException('No real filename for storage given in "'.$source.'"');
        }

        $file = $this->page->mediaPath.$filename;

        if (!$this->media->exists($file)) {
            $this->media->put($file, file_get_contents($source));
            Event::fire('media.file.upload', [null, $file, null]);
        }

        return $file;
    }

    protected function sync()
    {
        foreach ($this->posts() as $post) {
            $existing = $this->page->posts()->where('remote_id', $post['remote_id'])->first();

            if ($existing) {
                $existing->update($post);
            } else {
                $existing = $this->page->posts()->create($post);
            }

            foreach ($post['attachments'] as $attachment) {
                $existing->attachments()->updateOrCreate(['remote_id' => $attachment['remote_id']], $attachment);
            }
        }

        $this->cleanOutdated();
    }

}