// markdownify renders a given string from Markdown to HTML.
func markdownify(in interface{}) template.HTML {
	text := cast.ToString(in)
	m := helpers.RenderBytes(&helpers.RenderingContext{Content: []byte(text), PageFmt: "markdown"})
	m = bytes.TrimPrefix(m, markdownTrimPrefix)
	m = bytes.TrimSuffix(m, markdownTrimSuffix)
	return template.HTML(m)
}

func ShortcodesHandle(stringToParse string, p *Page, t Template) string {
	leadStart := strings.Index(stringToParse, `{{%`)
	if leadStart >= 0 {
		leadEnd := strings.Index(stringToParse[leadStart:], `%}}`) + leadStart
		if leadEnd > leadStart {
			name, par := SplitParams(stringToParse[leadStart+3 : leadEnd])
			tmpl := GetTemplate(name, t)
			if tmpl == nil {
				return stringToParse
			}
			params := Tokenize(par)
			// Always look for closing tag.
			endStart, endEnd := FindEnd(stringToParse[leadEnd:], name)
			var data = &ShortcodeWithPage{Params: params, Page: p}
			if endStart > 0 {
				s := stringToParse[leadEnd+3 : leadEnd+endStart]
				data.Inner = template.HTML(helpers.RenderBytes([]byte(CleanP(ShortcodesHandle(s, p, t))), p.guessMarkupType(), p.UniqueId()))
				remainder := CleanP(stringToParse[leadEnd+endEnd:])

				return CleanP(stringToParse[:leadStart]) +
					ShortcodeRender(tmpl, data) +
					CleanP(ShortcodesHandle(remainder, p, t))
			}
			return CleanP(stringToParse[:leadStart]) +
				ShortcodeRender(tmpl, data) +
				CleanP(ShortcodesHandle(stringToParse[leadEnd+3:], p,
					t))
		}
	}
	return stringToParse
}

func (p *Page) renderContent(content []byte) []byte {
	var fn helpers.LinkResolverFunc
	var fileFn helpers.FileResolverFunc
	if p.getRenderingConfig().SourceRelativeLinksEval {
		fn = func(ref string) (string, error) {
			return p.Node.Site.SourceRelativeLink(ref, p)
		}
		fileFn = func(ref string) (string, error) {
			return p.Node.Site.SourceRelativeLinkFile(ref, p)
		}
	}
	return helpers.RenderBytes(&helpers.RenderingContext{Content: content, RenderTOC: true, PageFmt: p.determineMarkupType(),
		DocumentID: p.UniqueID(), Config: p.getRenderingConfig(), LinkResolver: fn, FileResolver: fileFn})
}

func renderShortcode(sc shortcode, parent *ShortcodeWithPage, p *Page, t tpl.Template) string {
	tmpl := getShortcodeTemplate(sc.name, t)

	if tmpl == nil {
		jww.ERROR.Printf("Unable to locate template for shortcode '%s' in page %s", sc.name, p.BaseFileName())
		return ""
	}

	data := &ShortcodeWithPage{Params: sc.params, Page: p, Parent: parent}
	if sc.params != nil {
		data.IsNamedParams = reflect.TypeOf(sc.params).Kind() == reflect.Map
	}

	if len(sc.inner) > 0 {
		var inner string
		for _, innerData := range sc.inner {
			switch innerData.(type) {
			case string:
				inner += innerData.(string)
			case shortcode:
				inner += renderShortcode(innerData.(shortcode), data, p, t)
			default:
				jww.ERROR.Printf("Illegal state on shortcode rendering of '%s' in page %s. Illegal type in inner data: %s ",
					sc.name, p.BaseFileName(), reflect.TypeOf(innerData))
				return ""
			}
		}

		if sc.doMarkup {
			newInner := helpers.RenderBytes(&helpers.RenderingContext{
				Content: []byte(inner), PageFmt: p.guessMarkupType(),
				DocumentID: p.UniqueID(), Config: p.getRenderingConfig()})

			// If the type is “unknown” or “markdown”, we assume the markdown
			// generation has been performed. Given the input: `a line`, markdown
			// specifies the HTML `<p>a line</p>\n`. When dealing with documents as a
			// whole, this is OK. When dealing with an `{{ .Inner }}` block in Hugo,
			// this is not so good. This code does two things:
			//
			// 1.  Check to see if inner has a newline in it. If so, the Inner data is
			//     unchanged.
			// 2   If inner does not have a newline, strip the wrapping <p> block and
			//     the newline. This was previously tricked out by wrapping shortcode
			//     substitutions in <div>HUGOSHORTCODE-1</div> which prevents the
			//     generation, but means that you can’t use shortcodes inside of
			//     markdown structures itself (e.g., `[foo]({{% ref foo.md %}})`).
			switch p.guessMarkupType() {
			case "unknown", "markdown":
				if match, _ := regexp.MatchString(innerNewlineRegexp, inner); !match {
					cleaner, err := regexp.Compile(innerCleanupRegexp)

					if err == nil {
						newInner = cleaner.ReplaceAll(newInner, []byte(innerCleanupExpand))
					}
				}
			}

			data.Inner = template.HTML(newInner)
		} else {
			data.Inner = template.HTML(inner)
		}

	}

	return renderShortcodeWithPage(tmpl, data)
}

func (p *Page) renderBytes(content []byte) []byte {
	return helpers.RenderBytes(
		&helpers.RenderingContext{Content: content, PageFmt: p.guessMarkupType(),
			DocumentID: p.UniqueID(), Config: p.getRenderingConfig()})
}

func Markdownify(text string) template.HTML {
	m := helpers.RenderBytes(&helpers.RenderingContext{Content: []byte(text), PageFmt: "markdown"})
	m = bytes.TrimPrefix(m, markdownTrimPrefix)
	m = bytes.TrimSuffix(m, markdownTrimSuffix)
	return template.HTML(m)
}

func Markdownify(text string) template.HTML {
	return template.HTML(helpers.RenderBytes(&helpers.RenderingContext{Content: []byte(text), PageFmt: "markdown"}))
}

func (p *Page) renderBytes(content []byte) []byte {
	return helpers.RenderBytes(content, p.guessMarkupType(), p.UniqueId())
}