package npc

import (
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/theme"
)

type FlowLayout struct {
	LastKnownParentSize fyne.Size
}

func (fl *FlowLayout) MinSize(objects []fyne.CanvasObject) fyne.Size {

	return fyne.NewSize(0, 0)
}

func getMinHeight(objects []fyne.CanvasObject) fyne.Size {
	ret := fyne.NewSize(0, 0)
	for _, v := range objects {
		if v.MinSize().Height > ret.Height {
			ret.Height = v.MinSize().Height
		}
	}
	return ret
}

func (fl *FlowLayout) Layout(objects []fyne.CanvasObject, size fyne.Size) {
	fl.LastKnownParentSize = size
	if fl.LastKnownParentSize.Height > size.Height {

		i, x, y := 0, float32(0), float32(0)
		lastRowMaxH, lastRowEnd := float32(0), 0
		for _, child := range objects {
			if !child.Visible() {
				continue
			}
			if i > 1 {
				if x+objects[i-1].MinSize().Width > size.Width {
					x = 0
					y = y + getMinHeight(objects[lastRowEnd:i]).Height
					lastRowEnd = i
				} else {
					x = x + objects[i-1].MinSize().Width
				}
			}

			if i%g.colCount == 0 {
				g.rowCount++
			}

			child.Move(fyne.NewPos(x, y))
			child.Resize(g.CellSize)

			if (i+1)%g.colCount == 0 {
				x = 0
				y += g.CellSize.Height + theme.Padding()
			} else {
				x += g.CellSize.Width + theme.Padding()
			}
			i++
		}
	}
}