/* 
 *                                dbMango
 *
 * Copyright 2025 Deutsche Bank AG
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using Markdig;
using Markdig.Renderers.Html;
using Markdig.Syntax;
using Markdig.Syntax.Inlines;

namespace Rms.Risk.Mango.Services;

public static class MarkdownPipelineBuilderExtensions
{
    public static bool IsLocalUrl(string url) => !url.StartsWith("http://") && !url.StartsWith("https://");

    public static MarkdownPipelineBuilder UseLocalUrlHandler(this MarkdownPipelineBuilder pipeline)
    {
        pipeline.DocumentProcessed += document =>
        {
            foreach (var link in document.Descendants<LinkInline>())
            {
                if (link.Url == null)
                    continue;


                if (link.Url.StartsWith("/"))
                {
                    link.GetAttributes().AddPropertyIfNotExist("target", "_blank");
                }
                else if (IsLocalUrl(link.Url))
                {
                    var name = Path.GetFileNameWithoutExtension(link.Url);
                    // Modify the URL
                    link.Url = $"/doc/{name}";
                }
                else
                {
                    link.GetAttributes().AddPropertyIfNotExist("target", "_blank");
                }
            }
        };
        return pipeline;
    }
}