last_light/render/text.go

package render

import (
	"mvvasilev/last_light/util"
	"strings"
	"unicode/utf8"

	"github.com/gdamore/tcell/v2"
	"github.com/google/uuid"
)

type Drawable interface {
	UniqueId() uuid.UUID
	Draw(s tcell.Screen)
}

type text struct {
	id       uuid.UUID
	content  []string
	position util.Position
	size     util.Size
	style    tcell.Style
}

func CreateText(
	x, y uint16,
	width, height uint16,
	content string,
	style tcell.Style,
) text {
	return text{
		id:       uuid.New(),
		content:  strings.Split(content, " "),
		style:    style,
		size:     util.SizeOf(width, height),
		position: util.PositionAt(x, y),
	}
}

func (t text) UniqueId() uuid.UUID {
	return t.id
}

func (t text) Draw(s tcell.Screen) {
	width := t.size.Width()
	height := t.size.Height()
	x := t.position.X()
	y := t.position.Y()

	currentHPos := 0
	currentVPos := 0

	drawText := func(text string) {
		for i, r := range text {
			s.SetContent(x+currentHPos+i, y+currentVPos, r, nil, t.style)
		}
	}

	for _, s := range t.content {
		runeCount := utf8.RuneCountInString(s)

		if currentVPos > height {
			break
		}

		// The current word cannot fit within the remaining space on the line
		if runeCount > (width - currentHPos) {
			currentVPos += 1 // next line
			currentHPos = 0  // reset to start of line

			drawText(s + " ")
			currentHPos += runeCount + 1

			continue
		}

		// The current word fits exactly within the remaining space on the line
		if runeCount == (width - currentHPos) {
			drawText(s)

			currentVPos += 1 // next line
			currentHPos = 0  // reset to start of line

			continue
		}

		// The current word fits within the remaining space, and there's more space left over
		drawText(s + " ")
		currentHPos += runeCount + 1 // add +1 to account for space after word
	}
}