package main

// #include <stdlib.h>
import "C"

import (
	"bytes"
	"fmt"
	"unsafe"

	chromahtml "github.com/alecthomas/chroma/v2/formatters/html"
	"github.com/yuin/goldmark"
	highlighting "github.com/yuin/goldmark-highlighting/v2"
	"github.com/yuin/goldmark/util"
)

var md = goldmark.New(
	goldmark.WithExtensions(
		highlighting.NewHighlighting(
			highlighting.WithStyle("github-dark"),
			highlighting.WithWrapperRenderer(func(w util.BufWriter, context highlighting.CodeBlockContext, entering bool) {
				lang, _ := context.Language()

				if entering {
					if lang == nil {
						w.WriteString(`<div><pre class="aero"><code>`)
						return
					}

					w.WriteString(fmt.Sprintf(`<div class="code-block"><p class="code-block-header"><span class="language-name">%s</span></p><pre class="aero"><code>`, lang))
				} else {
					w.WriteString(`</code></pre></div>`)
				}
			}),
			highlighting.WithFormatOptions(
				chromahtml.PreventSurroundingPre(true),
			),
		),
	),
)

//export MarkdownToHTML
func MarkdownToHTML(source *C.char) *C.char {
	src := C.GoString(source)

	var buf bytes.Buffer
	if err := md.Convert([]byte(src), &buf); err != nil {
		return C.CString("")
	}

	return C.CString(buf.String())
}

//export FreeString
func FreeString(s *C.char) {
	C.free(unsafe.Pointer(s))
}

func main() {} // required, unused