<?php
// Comment if you don't want to allow posts from other domains
header('Access-Control-Allow-Origin: *');

// Allow the following methods to access this file
header('Access-Control-Allow-Methods: OPTIONS, GET, DELETE, POST, HEAD, PATCH');

// Allow the following headers in preflight
header('Access-Control-Allow-Headers: content-type, upload-length, upload-offset, upload-name');

// Allow the following headers in response
header('Access-Control-Expose-Headers: upload-offset');

// Load our configuration for this server
require_once ('config.php');
require ("./util/upload_media.php");
require ("./util/read_write_functions.php");

if ($_SERVER['REQUEST_METHOD'] === "GET")
{

    function getRequestHeaders()
    {
        $headers = array();
        foreach ($_SERVER as $key => $value)
        {
            if (substr($key, 0, 5) <> 'HTTP_')
            {
                continue;
            }
            $header = str_replace(' ', '-', ucwords(str_replace('_', ' ', strtolower(substr($key, 5)))));
            $headers[$header] = $value;
        }
        return $headers;
    }

    // $headers = getRequestHeaders();
    // header('Content-Type: application/json');
    // echo json_encode(["headers" =>$headers, "get" => $_GET]);
    // exit();
    $uniqueFileID = $_GET["key"];

    function loadLocalImage()
    {

        global $uniqueFileID;

        $imageName = null;

        // checking if image exists in db with uniqueFileID
        $arrayDBStore = readJsonFile();

        $imageInfoIndex = array_search($uniqueFileID, array_column($arrayDBStore, 'id'));

        if (isset($imageInfoIndex))
        {

            $imageInfo = $arrayDBStore[$imageInfoIndex];
            $imageName = $imageInfo["name"];

        }

        // if imageName was found in the DB, get file with imageName and return file object or blob
        $imagePointer = UPLOAD_DIR . $imageName;
        $fileObject = null;
        if ($imageName && file_exists($imagePointer))
        {

            $fileObject = file_get_contents($imagePointer);

        }

        return [$fileObject, $imageName];

    }

    // trigger load local image
    $loadImageResultArr = [$fileBlob, $imageName] = loadLocalImage();

    if ($fileBlob)
    {
        $imagePointer = UPLOAD_DIR . $imageName;
        $fileContextType = mime_content_type($imagePointer);
        $fileSize = filesize($imagePointer);

        // $handle = fopen($imagePointer, 'r');
        // if (!$handle) return false;
        // $content = fread($handle, filesize($imagePointer));
        http_response_code(200);
        header('Access-Control-Expose-Headers: Content-Disposition, Content-Length, X-Content-Transfer-Id');
        header("Content-Type: $fileContextType");
        header("Content-Length: $fileSize");
        header("Content-Disposition: inline; filename='$imageName'");
        echo $fileBlob;
        // echo json_encode(strlen($fileBlob));
        
    }
    else
    {
        http_response_code(500);
    }

    exit();

}
else
{

    http_response_code(400);
    exit();

}

?>