// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package markdown

import (
	"code.gitea.io/gitea/modules/markup"
	giteautil "code.gitea.io/gitea/modules/util"

	"github.com/yuin/goldmark/ast"
	"github.com/yuin/goldmark/text"
)

func (g *ASTTransformer) transformLink(ctx *markup.RenderContext, v *ast.Link, reader text.Reader) {
	// Links need their href to munged to be a real value
	link := v.Destination
	isAnchorFragment := len(link) > 0 && link[0] == '#'
	if !isAnchorFragment && !markup.IsFullURLBytes(link) {
		base := ctx.Links.Base
		if ctx.IsWiki {
			base = ctx.Links.WikiLink()
		} else if ctx.Links.HasBranchInfo() {
			base = ctx.Links.SrcLink()
		}
		link = []byte(giteautil.URLJoin(base, string(link)))
	}
	if isAnchorFragment {
		link = []byte("#user-content-" + string(link)[1:])
	}
	v.Destination = link
}
