/*
Copyright © Brian Buller <brian@bullercodeworks.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
package widgets

import "github.com/gdamore/tcell"

type Widget interface {
	Init(string, tcell.Style)
	Id() string
	// HandleResize receives a resize event from the parent with the amount of
	// space available to the widget.
	// If there is not enough space, the widget is allowed to freak out.
	HandleResize(*tcell.EventResize)
	HandleKey(*tcell.EventKey) bool
	HandleTime(*tcell.EventTime)
	Draw(tcell.Screen)
	DrawOffset(Coord, tcell.Screen)
	Active() bool
	SetActive(bool)
	Visible() bool
	SetVisible(bool)
	Focusable() bool
	Tabbable() bool
	SetTabbable(bool)
	SetX(int)
	SetY(int)
	GetX() int
	GetY() int
	GetPos() Coord
	SetPos(Coord)
	SetSize(Coord)
	// Whatever is managing this widget (parent widget, screen, etc) should
	// tell it exactly what the Width & Height are.
	// It _should_ try to base this off of WantW/WantH & MinW/MinH
	SetW(int)
	SetH(int)
	GetW() int
	GetH() int
	// Given infinite space, WantW & WantH are what this widget wants
	// This should reflect the current state of the widget, not potential
	WantW() int
	WantH() int
	// MinW & MinH are what this widget must have to be functional.
	// This should reflect the current state of the widget, not potential
	MinW() int
	MinH() int
}

func WidgetBottom(w Widget) int {
	return w.GetY() + w.GetH()
}

func WidgetRight(w Widget) int {
	return w.GetX() + w.GetW()
}

type Coord struct {
	X, Y int
}

func (p *Coord) Add(o Coord) Coord {
	return Coord{
		X: p.X + o.X,
		Y: p.Y + o.Y,
	}
}

func (p *Coord) ResizeEvent() *tcell.EventResize {
	return tcell.NewEventResize(p.X, p.Y)
}

// To validate that a struct satisfies this interface, you can do:
// var _ Widget - (*<struct>)(nil)
// where <struct> is the actual struct that you're validating.

type WidgetList []Widget

func (w *WidgetList) Contains(id string) bool {
	return w.Find(id) != nil
}

func (w *WidgetList) Find(id string) Widget {
	for _, wi := range *w {
		if wi.Id() == id {
			return wi
		}
	}
	return nil
}