<?php declare(strict_types=1);

namespace Picea;

use RecursiveIteratorIterator, RecursiveDirectoryIterator;

class FileFetcher
{
    protected array $folderList = [];

    public array $supportedExtensionList = [
        "phtml", "php", "html",
    ];

    public function __construct(?array $folderList = null) {
        if ( $folderList !== null ) {
            $this->addFolders($folderList);
        }
    }

    public function addFolder(string $folder, int $order = 100) : void
    {
        $folder = $this->normalizeFolder($folder);

        $this->folderList[$folder] = [
            'path' => $folder,
            'order' => $order,
        ];
    }

    public function addFolders(array $folderList) : void
    {
        foreach($folderList as $folder) {
            $this->addFolder($folder['path'], $folder['order']);
        }
    }

    protected function normalizeFolder(string $path) : string
    {
        return rtrim($path, '/\\');
    }

    public function folderList(?array $set = null) : ?array
    {
        return $set === null ? $this->folderList : $this->folderList = $set;
    }

    public function findFile(string $fileName) : string
    {
        usort($this->folderList, fn($a, $b) => $a['order'] <=> $b['order']);

        foreach($this->folderList() as $folder) {
            foreach($this->supportedExtensionList as $extension) {
                $file = $folder['path'] . DIRECTORY_SEPARATOR . "$fileName.$extension";
                $file = str_replace([ '\\', '/' ], DIRECTORY_SEPARATOR, $file);

                if ( file_exists($file) ) {
                    if ( is_dir($file) ) {
                        throw new \RuntimeException("Given view file `$fileName` is a folder, you must provide a valid filename.");
                    }

                    return $file;
                }
            }
        }

        # Fallback on full-path
        foreach($this->folderList() as $folder) {
            $file = $folder['path'] . DIRECTORY_SEPARATOR . $fileName;
            $file = str_replace([ '\\', '/' ], DIRECTORY_SEPARATOR, $file);

            if ( file_exists($file) ) {
                if ( is_dir($file) ) {
                    throw new \RuntimeException("Given view file `$fileName` is a folder, you must provide a valid filename.");
                }

                return $file;
            }
        }

        throw new \RuntimeException("Given view file `$fileName` can not be found within given folder list..");
    }

    public function getFileList() : array
    {
        usort($this->folderList, fn($a, $b) => $a['order'] <=> $b['order']);

        $list = [];

        foreach($this->folderList() as $folder) {
            $path = $folder['path'] . "/";
            $list[$path] = [];

            if ( \file_exists($path) ) {
                $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path, RecursiveDirectoryIterator::SKIP_DOTS), RecursiveIteratorIterator::SELF_FIRST, RecursiveIteratorIterator::CATCH_GET_CHILD);

                foreach ($iterator as $file) {
                    if ($file->isFile() && in_array($file->getExtension(), $this->supportedExtensionList)) {
                        $list[$path][] = $file;
                    }
                }
            }
        }

        return $list;
    }

    public function getFilePath(string $fileName) : string
    {
        return $this->findFile($fileName);
    }

    public function getFileContent(string $fileName) : string
    {
        return file_get_contents($this->getFilePath($fileName));
    }

}