<?php

declare(strict_types=1);

namespace App\Support\Http;

final class HttpUriNormalizer
{
    public function normalize(string $uri): string
    {
        $path = parse_url($uri, PHP_URL_PATH);
        if (! is_string($path) || $path === '') {
            $path = $uri;
        }

        $path = '/'.ltrim($path, '/');
        if ($path !== '/') {
            $path = rtrim($path, '/');
        }

        if (preg_match('#^/@([^/]+)(/.*)?$#', $path, $matches) === 1) {
            $rest = $matches[2] ?? '';

            return '/@{user}'.$this->normalizeSegments($rest);
        }

        return $this->normalizeSegments($path);
    }

    private function normalizeSegments(string $path): string
    {
        if ($path === '' || $path === '/') {
            return $path === '' ? '' : '/';
        }

        $segments = explode('/', $path);
        $normalized = [];

        foreach ($segments as $index => $segment) {
            if ($segment === '') {
                $normalized[] = '';
                continue;
            }

            $normalized[] = $this->normalizeSegment($segment, $index, $segments);
        }

        $result = implode('/', $normalized);

        return $result === '' ? '/' : $result;
    }

    /**
     * @param  array<int, string>  $segments
     */
    private function normalizeSegment(string $segment, int $index, array $segments): string
    {
        if (ctype_digit($segment)) {
            return '{id}';
        }

        if (preg_match('/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i', $segment) === 1) {
            return '{uuid}';
        }

        if (preg_match('/^[0-9a-f]{32,64}$/i', $segment) === 1) {
            return '{hash}';
        }

        if ($this->isArtworkPublicSlug($segment, $index, $segments)) {
            return '{slug}';
        }

        return $segment;
    }

    /**
     * /art/{id}/{slug} stays distinct from /art/{id}/similar and other actions.
     *
     * @param  array<int, string>  $segments
     */
    private function isArtworkPublicSlug(string $segment, int $index, array $segments): bool
    {
        if ($index !== 3 || ($segments[1] ?? '') !== 'art') {
            return false;
        }

        if (! ctype_digit((string) ($segments[2] ?? ''))) {
            return false;
        }

        $actions = ['similar', 'view', 'download', 'edit', 'comments', 'favourite', 'favorite'];

        return ! in_array(strtolower($segment), $actions, true);
    }
}