package confluence

// Confluence storage format macro helpers.

func CodeMacro(language string, body string) string {
	return CodeMacroWithID(language, body, "")
}

func CodeMacroWithID(language string, body string, macroID string) string {
	var lang string
	if language != "" {
		lang = `<ac:parameter ac:name="language">` + language + `</ac:parameter>`
	}
	tag := `<ac:structured-macro ac:name="code" ac:schema-version="1">`
	if macroID != "" {
		tag = `<ac:structured-macro ac:macro-id="` + macroID + `" ac:name="code" ac:schema-version="1">`
	}
	return tag +
		lang +
		`<ac:plain-text-body><![CDATA[` + escapeCDATA(body) + `]]></ac:plain-text-body>` +
		`</ac:structured-macro>`
}

func InfoPanel(body string) string {
	return `<ac:structured-macro ac:name="info" ac:schema-version="1">` +
		`<ac:rich-text-body>` + body + `</ac:rich-text-body>` +
		`</ac:structured-macro>`
}

func NotePanel(body string) string {
	return `<ac:structured-macro ac:name="note" ac:schema-version="1">` +
		`<ac:rich-text-body>` + body + `</ac:rich-text-body>` +
		`</ac:structured-macro>`
}

func WarningPanel(body string) string {
	return `<ac:structured-macro ac:name="warning" ac:schema-version="1">` +
		`<ac:rich-text-body>` + body + `</ac:rich-text-body>` +
		`</ac:structured-macro>`
}

func ImageExternal(url string) string {
	return `<ac:image><ri:url ri:value="` + url + `"/></ac:image>`
}

// escapeCDATA splits ]]> sequences so they don't break CDATA sections.
func escapeCDATA(s string) string {
	result := make([]byte, 0, len(s))
	for i := 0; i < len(s); i++ {
		if i+2 < len(s) && s[i] == ']' && s[i+1] == ']' && s[i+2] == '>' {
			result = append(result, ']', ']', '>', '<', '!', '[', 'C', 'D', 'A', 'T', 'A', '[')
			i += 2
		} else {
			result = append(result, s[i])
		}
	}
	return string(result)
}