<?php declare(strict_types=1);
namespace openvk\VKAPI\Handlers;
use openvk\Web\Models\Repositories\Users as UsersRepo;
use openvk\Web\Models\Repositories\{Posts as PostsRepo, Comments as CommentsRepo, Photos as PhotosRepo, Videos as VideosRepo};

final class Likes extends VKAPIRequestHandler
{
	function add(string $type, int $owner_id, int $item_id): object
	{
		$this->requireUser();
        $this->willExecuteWriteAction();

        switch($type) {
            case "post":
                $post = (new PostsRepo)->getPostById($owner_id, $item_id);
                if(is_null($post))
                    $this->fail(100, "One of the parameters specified was missing or invalid: object not found");

                $post->setLike(true, $this->getUser());

                return (object) [
                    "likes" => $post->getLikesCount()
                ];
            default:
                $this->fail(100, "One of the parameters specified was missing or invalid: incorrect type");
        }
	}

	function delete(string $type, int $owner_id, int $item_id): object
	{
		$this->requireUser();
        $this->willExecuteWriteAction();

        switch($type) {
            case "post":
                $post = (new PostsRepo)->getPostById($owner_id, $item_id);
                if (is_null($post))
                    $this->fail(100, "One of the parameters specified was missing or invalid: object not found");

                $post->setLike(false, $this->getUser());
                return (object) [
                    "likes" => $post->getLikesCount()
                ];
            default:
                $this->fail(100, "One of the parameters specified was missing or invalid: incorrect type");
        }
	}
	
    function isLiked(int $user_id, string $type, int $owner_id, int $item_id): object
	{
		$this->requireUser();

        switch($type) {
            case "post":
                $user = (new UsersRepo)->get($user_id);
                if (is_null($user))
                    $this->fail(100, "One of the parameters specified was missing or invalid: user not found");

                $post = (new PostsRepo)->getPostById($owner_id, $item_id);
                if (is_null($post))
                    $this->fail(100, "One of the parameters specified was missing or invalid: object not found");
                
                return (object) [
                    "liked"  => (int) $post->hasLikeFrom($user),
                    "copied" => 0 # TODO: handle this
                ];
            default:
                $this->fail(100, "One of the parameters specified was missing or invalid: incorrect type");
        }
	}

    function getList(string $type, int $owner_id, int $item_id, bool $extended = false, int $offset = 0, int $count = 10, bool $skip_own = false)
    {
        $this->requireUser();

        $object = NULL;

        switch($type) {
            case "post":
                $object = (new PostsRepo)->getPostById($owner_id, $item_id);
                break;
            case "comment":
                $object = (new CommentsRepo)->get($item_id);
                break;
            case "photo":
                $object = (new PhotosRepo)->getByOwnerAndVID($owner_id, $item_id);
                break;
            case "video":
                $object = (new VideosRepo)->getByOwnerAndVID($owner_id, $item_id);
                break;
            default:
                $this->fail(58, "Invalid type");
                break;
        }

        if(!$object || $object->isDeleted())
            $this->fail(56, "Invalid postable");

        $res = (object)[
            "count" => $object->getLikesCount(),
            "items" => []
        ];

        $likers = array_slice(iterator_to_array($object->getLikers(1, $offset + $count)), $offset);
        
        foreach($likers as $liker) {
            if($skip_own && $liker->getId() == $this->getUser()->getId())
                continue;

            if(!$extended)
                $res->items[] = $liker->getId();
            else
                $res->items[] = $liker->toVkApiStruct();
        }

        return $res;
    }
}