package gold

import (
	"io"
	"strconv"

	"github.com/logrusorgru/aurora"
	bf "gopkg.in/russross/blackfriday.v2"
)

type BaseElement struct {
	Token  string
	Prefix string
	Suffix string
	Style  StyleType
}

func renderText(w io.Writer, rules *ElementStyle, s string) {
	if len(s) == 0 {
		return
	}

	out := aurora.Reset(s)

	if rules != nil {
		if rules.Color != "" {
			i, err := strconv.Atoi(rules.Color)
			if err == nil && i >= 0 && i <= 255 {
				out = out.Index(uint8(i))
			}
		}
		if rules.BackgroundColor != "" {
			i, err := strconv.Atoi(rules.BackgroundColor)
			if err == nil && i >= 0 && i <= 255 {
				out = out.BgIndex(uint8(i))
			}
		}

		if rules.Underline {
			out = out.Underline()
		}
		if rules.Bold {
			out = out.Bold()
		}
		if rules.Italic {
			out = out.Italic()
		}
		if rules.CrossedOut {
			out = out.CrossedOut()
		}
		if rules.Overlined {
			out = out.Overlined()
		}
		if rules.Inverse {
			out = out.Reverse()
		}
		if rules.Blink {
			out = out.Blink()
		}
	}

	_, _ = w.Write([]byte(out.String()))
}

func (e *BaseElement) Render(w io.Writer, node *bf.Node, tr *TermRenderer) error {
	renderText(w, tr.blockStack.Current().Style, e.Prefix)
	defer func() {
		renderText(w, tr.blockStack.Current().Style, e.Suffix)
	}()

	rules := tr.blockStack.With(tr.style[e.Style])
	if rules != nil {
		renderText(w, rules, rules.Prefix)
		defer func() {
			renderText(w, rules, rules.Suffix)
		}()
	}

	renderText(w, rules, e.Token)
	return nil
}