<?php

namespace App\Models;

use App\Render\BladeRenderer;
use App\Render\MarkdownRenderer;
use App\Render\Renderer;
use App\SiteConfiguration;
use Illuminate\Contracts\Filesystem\Filesystem;
use Illuminate\Support\Facades\Storage;
use League\CommonMark\Environment\Environment;
use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;
use League\CommonMark\Extension\FrontMatter\FrontMatterExtension;
use League\CommonMark\Extension\FrontMatter\Output\RenderedContentWithFrontMatter;
use League\CommonMark\MarkdownConverter;

use function Illuminate\Filesystem\join_paths;

// TODO: Load page's frontmatter and replace things like
// title and layout from it. Also set any default,
// values for things like layout from the config
// if they're not present on the page.
class Page
{
    public string $filename;
    public string $fileExtension;
    public string $directory;
    public string $title;
    public string $slug;
    public bool $isIndex;
    public string $key;
    protected Filesystem $sourceDisk;
    public ?string $layout;
    public ?string $collection = null;
    public string $entityName; // The name of this page. Ex: projects/myproject = myproject
    protected string $content;

    public function __construct(public string $path)
    {
        $this->sourceDisk = Storage::disk('source');

        $this->filename = basename($this->path);
        $this->fileExtension = (str_ends_with($this->filename, '.blade.php')) ? 'blade.php' : pathinfo($this->filename, PATHINFO_EXTENSION);
        $this->fileExtension = str($this->fileExtension)->trim('.')->toString();
        $this->title = str($this->filename)->remove("." . $this->fileExtension)->title()->toString();
        $this->slug = str($this->title)->slug();
        $this->isIndex = str($this->filename)->remove("." . $this->fileExtension)->toString() == "index";
        $this->directory = dirname($this->path);
        $this->key = str($this->path)->remove("." . $this->fileExtension)->replace("/", ".")->lower()->toString();
        $this->entityName = $this->isIndex ? basename($this->directory) : $this->slug;

        $this->detectCollection();
        $this->fillAdditionalData();
    }

    // TODO: Do something with the [params]
    // from the collection name if present.
    // Maybe store it in a $collectionParams
    // array on the page or something.
    public function detectCollection()
    {
        $key_parts = explode('.', $this->key);
        $collections = SiteConfiguration::collections();

        foreach ($collections as $c) {
            $parts = explode('.', $c);
            // If we have key: projects.something
            // and collection projects.[project_name].docs
            // then it's not it
            if (count($parts) > $key_parts) {
                continue;
            }

            // Get a subset of max length key parts
            $key_compare = array_slice($key_parts, 0, count($parts));
            $match = true;
            foreach ($key_compare as $i => $v) {
                // TODO: Use regex here to search for [] instead of just [
                if ($v !== $parts[$i] && !str($parts[$i])->contains("[")) {
                    $match = false;
                    break;
                }
            }

            if ($match) $this->collection = $c;
        }
    }

    /**
     * Grab data from the file's front matter
     * as well as the config and overwrite
     * or fill in any missing attributes.
     *
     * @return void
     */
    public function fillAdditionalData()
    {
        // If we have a collection, get the settings from it
        if (!empty($this->collection)) {
            $config = SiteConfiguration::getConfig()['collections'][$this->collection];
            // if ($this->collection == "projects") {
            //     dd($config);
            // }

            $fillIfEmpty = ['layout'];

            foreach ($fillIfEmpty as $field) {
                if (empty($this->$field) && !empty($config[$field])) {
                    $this->$field = $config[$field];
                }
            }
        }

        // Grab front matter data if any
        if ($this->fileExtension == 'md') {
            // Build the markdown parser
            $mdEnvironment = new Environment();
            $mdEnvironment->addExtension(new CommonMarkCoreExtension);
            $mdEnvironment->addExtension(new FrontMatterExtension);

            $parser = new MarkdownConverter($mdEnvironment);
            $parsed = $parser->convert($this->content());
            if ($parsed instanceof RenderedContentWithFrontMatter) {
                $frontMatter = $parsed->getFrontMatter();
                foreach ($frontMatter as $field => $value) {
                    $this->$field = $value;
                }
            }
        }

        // If layout is still empty just set it to main
        if (empty($this->layout)) $this->layout = 'main';
    }

    public function renderer(): Renderer
    {
        return ($this->fileExtension == 'blade.php') ? new BladeRenderer : new MarkdownRenderer;
    }

    public function render(): string
    {
        return $this->renderer()->render($this);
    }

    public function outputPath(): string
    {

        $baseDirectory = $this->directory;
        if ($this->isIndex) {
            return join_paths($baseDirectory, "index.html");
        }

        return join_paths($baseDirectory, "{$this->slug}", "index.html");
    }

    public function content(): string
    {
        if (!empty($this->content)) {
            return $this->content;
        }

        $content = Storage::disk('source')->get($this->path);
        $this->content = $content;
        return $content;
    }
}