<?php
namespace api\blog;
use api\utils\imgUtils;
use DOMDocument;
use PDO;
use Psr\Http\Message\UploadedFileInterface;

require_once __DIR__ . "/../utils/config.php";
require_once __DIR__ . "/../utils/imgUtils.php";

/**
 * Blog Data Class
 * Define all functions which either get, update, create or delete posts
 */
class blogData
{
    /**
     * Get all blog posts
     * @return array - Array of all blog posts or error message
     */
    public function getBlogPosts(): array
    {
        $conn = dbConn();
        $stmt = $conn->prepare("SELECT ID, title, dateCreated, dateModified, body, categories FROM blog ORDER BY dateCreated DESC;");
        $stmt->execute();

        // set the resulting array to associative
        $result = $stmt->fetchAll(PDO::FETCH_ASSOC);

        if ($result)
        {
            return $result;
        }

        return array("errorMessage" => "Error, blog data not found");
    }

    /**
     * Get a blog post with the given ID
     * @param string $ID - ID of the blog post to get
     * @return array - Array of all blog posts or error message
     */
    public function getBlogPost(string $ID): array
    {
        $conn = dbConn();
        $stmt = $conn->prepare("SELECT  ID, title, dateCreated, dateModified, featured, headerImg, body, categories FROM blog WHERE ID = :ID;");
        $stmt->bindParam(":ID", $ID);
        $stmt->execute();

        // set the resulting array to associative
        $result = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($result)
        {
            return $result;
        }

        return array("errorMessage" => "Error, blog post could not found");
    }

    /**
     * Get the latest blog post
     * @return array - Array of the latest blog post or error message
     */
    public function getLatestBlogPost(): array
    {
        $conn = dbConn();
        $stmt = $conn->prepare("SELECT ID, title, dateCreated, dateModified, featured, headerImg, body, categories FROM blog ORDER BY dateCreated DESC LIMIT 1;");
        $stmt->execute();

        // set the resulting array to associative
        $result = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($result)
        {
            return $result;
        }

        return array("errorMessage" => "Error, blog post could not found");
    }

    /**
     * Get featured blog post
     * @return array - Array of the featured blog post or error message
     */
    public function getFeaturedBlogPost(): array
    {
        $conn = dbConn();
        $stmt = $conn->prepare("SELECT ID, title, dateCreated, dateModified, featured, headerImg, body, categories FROM blog WHERE featured = 1;");
        $stmt->execute();

        $result = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($result)
        {
            return $result;
        }

        return array("errorMessage" => "Error, blog post could not found");
    }

    /**
     * Upload the images in the post to temp folder and return image location
     * @param UploadedFileInterface $img - Image to upload
     * @return string|array - String with error message or array with the location of the uploaded file
     */
    public function uploadPostImage(UploadedFileInterface $img): string|array
    {
        $targetDir = "../blog/imgs/tmp/";
        $imagUtils = new imgUtils();
        $targetFile = $imagUtils->uploadFile($targetDir, $img);

        $file = $targetDir . basename($img->getClientFilename());

        if (file_exists($file))
        {
            return array("url" => $file);
        }

        if (!is_array($targetFile))
        {
            return $targetFile;
        }

        if (file_exists($targetFile["imgLocation"]))
        {
            return array("url" => $targetFile["imgLocation"]);
        }

        return "Couldn't upload the image";
    }

    /**
     * Creates a new post directory, uploads the header image and moves the images from the
     * temp folder to the new folder, then updates the post html to point to the new images, finally
     * it creates the post in the database
     * @param string $title - Title of the blog post
     * @param string $body - Body of the blog post
     * @param string $dateCreated - Date the blog post was created
     * @param string $featured - Whether the blog post is featured or not
     * @param string $categories - Categories of the blog post
     * @param UploadedFileInterface $headerImg - Header image of the blog post
     * @return int|string - ID of the blog post or error message
     */
    public function createPost(string $title, string $body, string $dateCreated, string $featured, string $categories, UploadedFileInterface $headerImg): int|string
    {
        $conn = dbConn();
        $targetDir = "../blog/imgs/" . $title . "_" . uniqid() . "/";
        mkdir($targetDir, 0777, true);
        $imagUtils = new imgUtils();
        $targetFile = $imagUtils->uploadFile($targetDir, $headerImg);
        if (!is_array($targetFile))
        {
            return $targetFile;
        }

        $htmlDoc = new DOMDocument();
        $htmlDoc->loadHTML($body, LIBXML_NOERROR);
        $doc = $htmlDoc->getElementsByTagName('body')->item(0);
        $imgs = $doc->getElementsByTagName('img');

        $srcList = array();

        foreach ($imgs as $img)
        {
            $src = $img->getAttribute("src");
            $srcList[] = $src;
            $fileName = basename($src);

            $img->setAttribute("src", $targetDir . $fileName);
        }

        $files = scandir("../blog/imgs/tmp/");
        foreach ($files as $file)
        {
            if ($file != "." && $file != "..")
            {
                if (!in_array("../blog/imgs/tmp/" . $file, $srcList))
                {
                    unlink("../blog/imgs/tmp/" . $file);
                }
                else
                {
                    rename("../blog/imgs/tmp/" . $file, $targetDir . $file);
                }
            }
        }

        $newBody = '';
        foreach ($doc->childNodes as $node)
        {
            $newBody .= $htmlDoc->saveHTML($node);
        }

        $stmt = $conn->prepare("INSERT INTO blog (title, dateCreated, dateModified, featured, headerImg, body, categories) 
                                       VALUES (:title, :dateCreated, :dateModified, :featured, :headerImg, :body, :categories);");
        $stmt->bindParam(":title", $title);
        $stmt->bindParam(":dateCreated", $dateCreated);
        $stmt->bindParam(":dateModified", $dateCreated);
        $stmt->bindParam(":featured", $featured);
        $stmt->bindParam(":headerImg", $targetFile["imgLocation"]);
        $stmt->bindParam(":body", $newBody);
        $stmt->bindParam(":categories", $categories);

        if ($stmt->execute())
        {
            return intval($conn->lastInsertId());
        }

        return "Error, couldn't create post";
    }
}