// Copyright 2017-2025 WIT.COM Inc. All rights reserved.
// Use of this source code is governed by the GPL 3.0

package main

import (
	"slices"

	"github.com/awesome-gocui/gocui"
	log "go.wit.com/log"
	"go.wit.com/widget"
)

/*
	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
// returns all the widgets under (X,H) that are visible
func findByXY(w int, h int) []*guiWidget {
	rootW := me.treeRoot.TK.(*guiWidget)

	// this searches the binary tree recursively (function is right below)
	return rootW.findByXYreal(w, h)
}

func (r rectType) inRect(w int, h int) bool {
	if (r.w0 <= w) && (w <= r.w1) && (r.h0 <= h) && (h <= r.h1) {
		return true
	}
	return false
}

// this checks a widget to see if it is under (W,H), then checks the widget's children
// anything that matches is passed back as an array of widgets
func (tk *guiWidget) findByXYreal(w int, h int) []*guiWidget {
	var widgets []*guiWidget

	//	if !tk.Visible() {
	// ignore widgets that are not visible
	//	} else {

	// check the location to see if this is under (W,H)
	// if it is, return this widget
	// if (tk.gocuiSize.w0 <= w) && (w <= tk.gocuiSize.w1) &&
	// 	(tk.gocuiSize.h0 <= h) && (h <= tk.gocuiSize.h1) {
	//		if tk.gocuiSize.inRect(w, h) {
	//			widgets = append(widgets, tk)
	//		} else {
	// if (tk.full.w0 <= w) && (w <= tk.full.w1) &&
	// 	(tk.full.h0 <= h) && (h <= tk.full.h1) {
	if tk.full.inRect(w, h) {
		widgets = append(widgets, tk)
	}
	// log.Log(GOCUI, "findByXY() found", widget.node.WidgetType, w, h)
	//		}
	//	}
	// tk.verifyRect()

	// search through the children widgets in the binary tree
	for _, child := range tk.children {
		widgets = append(widgets, child.findByXYreal(w, h)...)
	}

	return widgets
}

// returns all the windows from the root of the binary tree
func findWindows() []*guiWidget {
	rootW := me.treeRoot.TK.(*guiWidget)
	return rootW.findWindows()
}

// walk the binary tree looking for WidgetType == Window
func (tk *guiWidget) findWindows() []*guiWidget {
	var found []*guiWidget

	if tk.node.WidgetType == widget.Window {
		found = append(found, tk)
	}

	for _, child := range tk.children {
		found = append(found, child.findWindows()...)
	}
	return found
}

// find the BG widget.
// This widget is always in the background and covers the whole screen.
// gocui seems to not return mouse events unless there is something there
func (tk *guiWidget) findBG() *guiWidget {
	if tk.node.WidgetType == widget.Stdout {
		if tk.node.WidgetId != me.stdout.wId {
			tk.isBG = true
			return tk
		}
	}

	for _, child := range tk.children {
		if found := child.findBG(); found != nil {
			return found
		}
	}
	return nil
}

// used by gocui.TabKey to rotate through the windows
func findNextWindow() *guiWidget {
	var found bool
	if len(me.allwin) == 0 {
		return nil
	}
	for _, tk := range me.allwin {
		if tk.window.active {
			found = true
			continue
		}
		if found {
			return tk
		}
	}
	// at the end, loop to the beginning
	return me.allwin[0]
}

func findWindowUnderMouse() *guiWidget {
	w, h := me.baseGui.MousePosition()

	if len(me.allwin) != len(findWindows()) {
		me.allwin = findWindows()
	}

	// if the stdout window is on top, check it first
	if me.stdout.outputOnTop {
		if me.stdout.tk.full.inRect(w, h) {
			// log.Info(fmt.Sprintf("findWindowUnderMouse() found %s stdout on top (%dx%d)", me.stdout.tk.cuiName, w, h))
			return me.stdout.tk
		}
	}

	/*
		// print out the window list
		for _, tk := range me.allwin {
			log.Info("findWindowUnderMouse() print:", tk.labelN, tk.window.active, tk.window.order)
		}
	*/

	// now check if the active window is below the mouse
	for _, tk := range me.allwin {
		if tk.window.active {
			if tk.full.inRect(w, h) {
				// log.Info(fmt.Sprintf("findWindowUnderMouse() found %s active window (%dx%d)", tk.cuiName, w, h))
				return tk
			}
		}
	}

	// well, just find any window then
	// sorting by order might work?
	slices.SortFunc(me.allwin, func(a, b *guiWidget) int {
		return a.window.order - b.window.order
	})

	/*
		// print out the window list
		for _, tk := range me.allwin {
			log.Info("findWindowUnderMouse() print:", tk.labelN, tk.window.active, tk.window.order)
		}
	*/
	for _, win := range me.allwin {
		if win.full.inRect(w, h) {
			// log.Info(fmt.Sprintf("findWindowUnderMouse() found %s window (%dx%d)", win.cuiName, w, h))
			return win
		}
	}

	// okay, no window. maybe the stdout is there?
	if me.stdout.tk.full.inRect(w, h) {
		// log.Info(fmt.Sprintf("findWindowUnderMouse() found %s stdout (%dx%d)", me.stdout.tk.cuiName, w, h))
		return me.stdout.tk
	}

	// geez. nothing! maybe auto return stdout?
	log.Info("findWindowUnderMouse() no window found at", w, h)
	return nil
}

// returns the "highest priority widget under the mouse
func findUnderMouse() *guiWidget {
	w, h := me.baseGui.MousePosition()

	widgets := findByXY(w, h)

	// search through all the widgets that were below the mouse click
	var found *guiWidget
	for _, w := range widgets {
		// prioritize window buttons. This means if some code covers
		// up the window widgets, then it will ignore everything else
		// and allow the user (hopefully) to redraw or switch windows
		// TODO: display the window widgets on top
		if w.node.WidgetType == widget.Window {
			return w
		}
	}

	// return anything else that is interactive
	for _, w := range widgets {
		if w.node.WidgetType == widget.Button {
			return w
		}
		if w.node.WidgetType == widget.Combobox {
			return w
		}
		if w.node.WidgetType == widget.Checkbox {
			return w
		}
		w.dumpWidget("findUnderMouse() found something unknown")
		found = w
	}
	// maybe something else was found
	return found
}

// panics. todo: fix ctrl-mouse click?
// find the widget under the mouse click
func ctrlDown(g *gocui.Gui, v *gocui.View) error {
	var found *guiWidget
	// var widgets []*node
	// var f func (n *node)
	found = findUnderMouse()
	if me.ctrlDown == nil {
		setupCtrlDownWidget()

		var tk *guiWidget
		tk = me.ctrlDown.TK.(*guiWidget)
		tk.labelN = found.String()
		tk.cuiName = "ctrlDown"
		// me.ctrlDown.parent = me.rootNode
	}
	var tk *guiWidget
	tk = me.ctrlDown.TK.(*guiWidget)
	if found == nil {
		found = me.treeRoot.TK.(*guiWidget)
	}
	tk.labelN = found.String()
	newR := found.realGocuiSize()
	tk.gocuiSize.w0 = newR.w0
	tk.gocuiSize.h0 = newR.h0
	tk.gocuiSize.w1 = newR.w1
	tk.gocuiSize.h1 = newR.h1
	return nil
}