// Package markdown handles markdown to html conversion.
package markdown
// implementation to refactor
// 1. use strings.Builder for html
// 2. use switch for char statements
// 3. setup for cycle
// 4. use strings.Count for header counter
import (
	"strconv"
	"strings"
)
// Render translates markdown to HTML.
func Render(markdown string) string {
	markdown = strings.Replace(markdown, "__", "<strong>", 1)
	markdown = strings.Replace(markdown, "__", "</strong>", 1)
	markdown = strings.Replace(markdown, "_", "<em>", 1)
	markdown = strings.Replace(markdown, "_", "</em>", 1)
	var header int
	var list bool
	var html strings.Builder
	for pos := 0; pos < len(markdown); pos++ {
		switch char := markdown[pos]; char {
		case '#':
			header = strings.Count(markdown, "#")
			pos += header
			html.WriteString("<h")
			html.WriteString(strconv.Itoa(header))
			html.WriteString(">")
		case '*':
			if !list {
				html.WriteString("<ul>")
			}
			html.WriteString("<li>")
			list = true
			pos += 1
		case '\n':
			if list {
				html.WriteString("</li>")
			}
			if header > 0 {
				html.WriteString("</h")
				html.WriteString(strconv.Itoa(header))
				html.WriteString(">")
				header = 0
			}
		default:
			if pos == 0 {
				html.WriteString("<p>")
			}
			html.WriteByte(char)
		}
	}
	if header > 0 {
		html.WriteString("</h")
		html.WriteString(strconv.Itoa(header))
		html.WriteString(">")
	}
	if list {
		html.WriteString("</li></ul>")
	}
	if !list && header == 0 {
		html.WriteString("</p>")
	}
	return html.String()
}