package main

type Columns []*Column

type Column struct {
	x, y    int
	w, h    int
	windows []*Window
}

// Add adds a new column and resizes. It returns the index of the newly created column.
func (cs Columns) Add() Columns {
	nw, nh := screen.Size()

	var nx, ny int
	if len(cs) > 0 {
		nx = cs[len(cs)-1].x + cs[len(cs)-1].w/2
		nw = cs[len(cs)-1].w / 2
		cs[len(cs)-1].w /= 2
	}

	newcol := &Column{nx, ny, nw, nh, nil}
	newwin := NewWindow("")
	newcol.windows = append(newcol.windows, newwin)
	cs = append(cs, newcol)

	return cs
}

func (c *Column) AddWindow(win *Window) {
	c.windows = append(c.windows, win)
	c.ResizeInternal()
}

func (c *Column) Resize(x, y, w, h int) {
	c.x, c.y = x, y
	c.w, c.h = w, h

	c.ResizeInternal()
}

func (c *Column) ResizeInternal() {
	var n int
	for i := range c.windows {
		if c.windows[i].visible {
			n++
		}
	}

	remainder := c.h % n
	for i, win := range c.windows {
		if i == 0 {
			win.Resize(c.x, c.y, c.w, c.h/n+remainder)
			continue
		}
		win.Resize(c.x, c.y+(c.h/n)*(i)+remainder, c.w, c.h/n)
	}
}