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package glightbox
import (
"bytes"
"fmt"
"math/rand"
"strings"
"time"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/renderer/html"
"github.com/yuin/goldmark/util"
)
type GLightboxHTMLRenderer struct {
html.Config
md goldmark.Markdown
}
func NewGLightboxHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {
r := &GLightboxHTMLRenderer{
Config: html.NewConfig(),
md: goldmark.New(
goldmark.WithRendererOptions(
html.WithHardWraps(),
html.WithXHTML(),
),
),
}
for _, opt := range opts {
opt.SetHTMLOption(&r.Config)
}
return r
}
func (r *GLightboxHTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
reg.Register(KindGLightboxBlock, r.renderGLightbox)
}
func (r *GLightboxHTMLRenderer) renderGLightbox(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
if entering {
gallery := n.(*GLightboxBlock)
if len(gallery.Images) == 0 {
return ast.WalkContinue, nil
}
galleryID := generateDivId(8)
var elements []string
for i, img := range gallery.Images {
imageUrlSegments := strings.Split(img.URL, ".")
imageUrlWithoutExt := strings.Join(imageUrlSegments[:len(imageUrlSegments)-1], ".")
imageUrlParts := strings.Split(imageUrlWithoutExt, "/")
imageNameParts := strings.Split(imageUrlParts[len(imageUrlParts)-1], "-")
var captionBuf bytes.Buffer
captionHTML := img.Caption
if err := r.md.Convert(img.Caption, &captionBuf); err == nil {
captionHTML = captionBuf.Bytes()
captionHTML = bytes.TrimPrefix(captionHTML, []byte("<p>"))
captionHTML = bytes.TrimSuffix(captionHTML, []byte("</p>\n"))
captionHTML = bytes.TrimSuffix(captionHTML, []byte("</p>"))
}
dayDate, _ := time.Parse("20060102 150405", imageNameParts[len(imageNameParts)-2]+" "+imageNameParts[len(imageNameParts)-1])
dayDate = dayDate.In(gallery.Location)
glightboxDescId := ""
if len(captionHTML) != 0 {
glightboxDescId = fmt.Sprintf("glightbox-desc-%s-%d", galleryID, i)
}
dataDescriptionAttribute := ""
if glightboxDescId != "" {
dataDescriptionAttribute = fmt.Sprintf("data-description=\".%s\"", glightboxDescId)
}
elements = append(elements, fmt.Sprintf(`
<a href="https://f003.backblazeb2.com/file/sayana-photos/full/%s" class="glightbox-%s grid-item grid-item-%s"
data-gallery="gallery-%s" data-title="%s" %s>
<img src="https://f003.backblazeb2.com/file/sayana-photos/webp-320p/%s.webp" class="rounded-md p-0.5" alt="webp thumbnail" />
</a>`, img.URL, galleryID, galleryID, galleryID, dayDate.Format("2006-01-02 15:04:05 -07:00"), dataDescriptionAttribute, imageUrlWithoutExt))
if glightboxDescId != "" {
elements = append(elements, fmt.Sprintf(`
<div class="glightbox-desc rounded-4 %s">
<p>%s</p>
</div>`, glightboxDescId, captionHTML))
}
}
w.WriteString(fmt.Sprintf(`
<div class="justify-content-center display-block m-1">
<hr class="border-t-3 border-dotted border-main-dark mt-1 mb-2 w-[80%%] ml-auto mr-auto">
<div class="grid masonry-grid-%s">
<div class="grid-sizer grid-sizer-%s"></div>
%s
</div>
<hr class="border-t-3 border-dotted border-main-dark mt-1 mb-2 w-[80%%] ml-auto mr-auto">
</div>`, galleryID, galleryID, strings.Join(elements, "\n")))
w.WriteString(fmt.Sprintf(`
<script>
var lightbox_%s = GLightbox({
selector: '.glightbox-%s'
});
var msnry_%s = new Masonry('.masonry-grid-%s', {
itemSelector: '.grid-item-%s',
columnWidth: '.grid-sizer-%s',
percentPosition: true
});
imagesLoaded('.masonry-grid-%s', function() {
msnry_%s.layout();
});
</script>`, galleryID, galleryID, galleryID, galleryID, galleryID, galleryID, galleryID, galleryID))
}
return ast.WalkContinue, nil
}
func generateDivId(length int) string {
const charset = "abcdefghijklmnopqrstuvwxyz"
seededRand := rand.New(rand.NewSource(time.Now().UnixNano())) // Seed with current time
b := make([]byte, length)
for i := range b {
b[i] = charset[seededRand.Intn(len(charset))]
}
return string(b)
}
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