package tui

import (
	"git.milar.in/milarin/slices"
	"github.com/gdamore/tcell"
	"github.com/mattn/go-runewidth"
)

func drawBuffer(scr tcell.Screen, buf *ViewBuffer) {
	buf.ForEachLine(func(y int, content []Rune) {
		for x := 0; x < buf.Width(); x++ {
			rn := content[x]

			extraRuneCount := runewidth.RuneWidth(rn.Rn) - 1
			var extraRunes []Rune
			if x+1+extraRuneCount < len(content) {
				extraRunes = content[x+1 : x+1+extraRuneCount]
			} else {
				extraRunes = content[x+1 : x+1]
			}

			scr.SetContent(x, y, rn.Rn, slices.Map(extraRunes, getRune), rn.Style)
			x += extraRuneCount
		}
	})

	scr.Show()
}

func getRune(rn Rune) rune {
	return rn.Rn
}

func truncateBuffer(buf *ViewBuffer, w, h int) *ViewBuffer {
	if w < 0 {
		w = buf.Width()
	}
	if h < 0 {
		h = buf.Height()
	}
	return buf.Sub(0, 0, w, h)
}