package main

import (
	"strings"

	"go.wit.com/log"
	"go.wit.com/toolkits/tree"
	"go.wit.com/widget"
)

func (w *guiWidget) placeBox(startW int, startH int) {
	if w.WidgetType != widget.Box {
		return
	}
	// tk.dumpTree("beforebox")

	newW := startW
	newH := startH

	for _, child := range w.children {
		sizeW, sizeH := child.Size()
		log.Log(INFO, "BOX START size(W,H) =", sizeW, sizeH, "new(W,H) =", newW, newH)
		child.placeWidgets(newW, newH)
		// re-get the Size (they should not have changed, but maybe they can?)
		// TODO: figure this out or report that they did
		sizeW, sizeH = child.Size()
		if w.node.State.Direction == widget.Vertical {
			log.Log(INFO, "BOX IS VERTICAL  ", w.String(), "newWH()", newW, newH, "child()", sizeW, sizeH, child.String())
			// expand based on the child height
			newH += sizeH
		} else {
			log.Log(INFO, "BOX IS HORIZONTAL", w.String(), "newWH()", newW, newH, "child()", sizeW, sizeH, child.String())
			// expand based on the child width
			newW += sizeW
		}
		log.Log(INFO, "BOX END   size(W,H) =", sizeW, sizeH, "new(W,H) =", newW, newH)
	}
	// tk.dumpTree("afterbox")
}

func (tk *guiWidget) placeWidgets(startW int, startH int) (int, int) {
	if tk == nil {
		return 0, 0
	}
	if me.treeRoot == nil {
		return 0, 0
	}

	tk.startW = startW
	tk.startH = startH

	switch tk.WidgetType {
	case widget.Window:
		newW := startW
		newH := startH
		var maxH int = 0
		for _, child := range tk.children {
			child.placeWidgets(newW, newH)
			sizeW, sizeH := child.Size()
			if sizeW < 20 {
				sizeW = 20
			}
			newW += sizeW
			if sizeH > maxH {
				maxH = sizeH
			}

		}
		return newW - startW, maxH
	case widget.Tab:
	case widget.Grid:
		return tk.placeGrid(startW, startH)
	case widget.Box:
		tk.placeBox(startW, startH)
		return 0, 0
	case widget.Group:
		// move the group to the parent's next location
		tk.gocuiSetWH(startW, startH)

		newW := startW + me.GroupPadW
		newH := startH + 1 // normal hight of the group label
		var maxW int = 0
		// now move all the children aka: run place() on them
		for _, child := range tk.children {
			sizeW, sizeH := child.placeWidgets(newW, newH)
			// newR := child.realGocuiSize()
			// w := newR.w1 - newR.w0
			// h := newR.h1 - newR.h0

			// increment straight down
			newH += sizeH + 1
			if sizeW > maxW {
				maxW = sizeW
			}
			log.Log(INFO, "REAL HEIGHT sizeW:", sizeW, "sizeH:", sizeH)
		}
		return maxW, newH - startH
	default:
		tk.gocuiSetWH(startW, startH)
		return tk.gocuiSize.Width(), tk.gocuiSize.Height()
	}
	return 0, 0
}

func (w *guiWidget) placeGrid(startW int, startH int) (int, int) {
	// w.showWidgetPlacement("grid0:")
	if w.WidgetType != widget.Grid {
		return 0, 0
	}

	// first compute the max sizes of the rows and columns
	for _, child := range w.children {
		childW, childH := child.placeWidgets(child.startW, child.startH)

		// set the child's realWidth, and grid offset
		if w.widths[child.node.State.AtW] < childW {
			w.widths[child.node.State.AtW] = childW
		}
		if w.heights[child.node.State.AtH] < childH {
			w.heights[child.node.State.AtH] = childH
		}
		// child.showWidgetPlacement("grid: ")
		log.Log(INFO, "placeGrid:", child.String(), "child()", childW, childH, "At()", child.node.State.AtW, child.node.State.AtH)
	}

	var maxW int = 0
	var maxH int = 0

	// find the width and height offset of the grid for AtW,AtH
	for _, child := range w.children {
		// child.showWidgetPlacement("grid1:")

		var totalW, totalH int
		for i, w := range w.widths {
			if i < child.node.State.AtW {
				totalW += w
			}
		}
		for i, h := range w.heights {
			if i < child.node.State.AtH {
				totalH += h
			}
		}

		// the new corner to move the child to
		newW := startW + totalW
		newH := startH + totalH

		if totalW > maxW {
			maxW = totalW
		}
		if totalH > maxH {
			maxH = totalH
		}

		log.Log(INFO, "placeGrid:", child.String(), "new()", newW, newH, "At()", child.node.State.AtW, child.node.State.AtH)
		child.placeWidgets(newW, newH)
		// child.showWidgetPlacement("grid2:")
	}
	// w.showWidgetPlacement("grid3:")
	return maxW, maxH
}

// computes the real, actual size of all the gocli objects in a widget
func (w *guiWidget) realGocuiSize() *rectType {
	var f func(tk *guiWidget, r *rectType)
	newR := new(rectType)
	// initialize the values to opposite
	newR.w0 = 80
	newR.h0 = 24
	if me.baseGui != nil {
		maxW, maxH := me.baseGui.Size()
		newR.w0 = maxW
		newR.h0 = maxH
	}
	newR.w1 = 0
	newR.h1 = 0

	// expand the rectangle to the biggest thing displayed
	f = func(tk *guiWidget, r *rectType) {
		newR := tk.gocuiSize
		if !tk.isFake {
			if r.w0 > newR.w0 {
				r.w0 = newR.w0
			}
			if r.h0 > newR.h0 {
				r.h0 = newR.h0
			}
			if r.w1 < newR.w1 {
				r.w1 = newR.w1
			}
			if r.h1 < newR.h1 {
				r.h1 = newR.h1
			}
		}
		for _, child := range tk.children {
			f(child, r)
		}
	}
	f(w, newR)
	return newR
}

func textSize(n *tree.Node) (int, int) {
	var tk *guiWidget
	tk = n.TK.(*guiWidget)
	var width, height int

	for _, s := range strings.Split(widget.GetString(tk.value), "\n") {
		if width < len(s) {
			width = len(s)
		}
		height += 1
	}
	return width, height
}

// moves the gocui view the W and H offset on the screen
/*
	gocui defines the offset like this:

 	   width -> increases to the right
	----------------------------------    hieght
	|            H = 1               |   increases
	|                                |       |
	| W = 1                   W = 18 |       |
	|                                |       v
	|            H = 5               |   downwards
	-------------------------------------
*/
// change over to this name
func (tk *guiWidget) MoveToOffset(W, H int) {
	tk.gocuiSetWH(W, H)
}

// returns where the corner of widget starts (upper left)
func (tk *guiWidget) Position() (int, int) {
	return tk.gocuiSize.w0, tk.gocuiSize.h0
}

func (tk *guiWidget) gocuiSetWH(sizeW, sizeH int) {
	w := len(widget.GetString(tk.value))
	lines := strings.Split(widget.GetString(tk.value), "\n")
	h := len(lines)

	// tk := n.tk
	if tk.isFake {
		tk.gocuiSize.w0 = sizeW
		tk.gocuiSize.h0 = sizeH
		tk.gocuiSize.w1 = tk.gocuiSize.w0 + w + me.FramePadW
		tk.gocuiSize.h1 = tk.gocuiSize.h0 + h + me.FramePadH
		return
	}

	if tk.frame {
		tk.gocuiSize.w0 = sizeW
		tk.gocuiSize.h0 = sizeH
		tk.gocuiSize.w1 = tk.gocuiSize.w0 + w + me.FramePadW
		tk.gocuiSize.h1 = tk.gocuiSize.h0 + h + me.FramePadH
	} else {
		tk.gocuiSize.w0 = sizeW - 1
		tk.gocuiSize.h0 = sizeH - 1
		tk.gocuiSize.w1 = tk.gocuiSize.w0 + w + 1
		tk.gocuiSize.h1 = tk.gocuiSize.h0 + h + 1
	}
}