package screens

import (
	"lab.zaar.be/thefish/alchemyst-go/engine/ecs"
	"lab.zaar.be/thefish/alchemyst-go/engine/types"
	"strings"
)

type InventoryScreen struct {
	*MenuScreen
	items []ecs.Entity
	
	cursor int
	offset int
	pageSize int
}

func (is *InventoryScreen) MakeInverntory() *InventoryScreen {
	is.drawFunc = is.InventoryRender
	is.inputFunc = is.HandleInput
	return is
}

func (is *InventoryScreen) SetItems(items []ecs.Entity) *InventoryScreen {
	is.items = items
	return is
}

func (is *InventoryScreen) HandleInput(input string) {
	switch input {
	case "PageUp":
		is.offset = is.offset - 1
		if is.offset < 0 {
			is.offset = 0
		}
		break
	case "PageDown":
		is.offset = is.offset + 1
		if is.offset > len(is.items)-1 {
			is.offset = len(is.items) - 1
		}
		break
	case "enter":
		//select current under cursor
		break;
	case "a","b","c","d","e","f","g","h","i","j","k","l":
		//selct by letter
		break;
	case "Escape":
		fallthrough
	case "Space":
		is.scm.SetScreen(is.scm.PreviousScreen)
		break
	}
}



func (is *InventoryScreen) InventoryRender() {
	menuLayer := is.mw.GetLayer("menu")
	menuLayer.ClearRect(is.Rect)
	bgLayer := is.mw.GetLayer("menubg")
	bgLayer.ClearRect(is.Rect)
	bgLayer.WithColor(is.bgColor).NewWindow(is.Rect).Splash()
	menuLayer.WithColor(is.fgColor).NewWindow(is.Rect).DoubleBordered(is.title)
	menuLayer.Print(is.X+(is.W/2)-7, is.Y+is.H-1, "╡"+"[color=green]Space[/color] to close"+"╞")
	footerHeight := 0
	if is.footer != "" {
		_, footerHeight = menuLayer.PrintInside(is.Rect, is.footer, 9)
		footerHeight = footerHeight + 2
	}
	_, headerHeight := menuLayer.PrintInside(is.Rect, is.header, blt.TK_ALIGN_LEFT)
	itemField := types.Rect{is.X, is.Y + headerHeight + 1, is.W, is.H - headerHeight - footerHeight}
	_ = itemField
	var ilw, ilh int
	if (len(is.items) > 0) {
		//fixme itemfield object, scroller, inputhandler, current selected item
		menuItems := make([]string, 0)
		for i := is.offset; i < len(is.items); i++ {
			if string(is.items[i].(string)) != "" {
				menuItems = append(menuItems, is.items[i].(string))
			}
		}
		ilw, ilh = menuLayer.PrintInside(itemField, strings.Join(menuItems, "\n"), blt.TK_ALIGN_LEFT)
	}
	if ilh < len(is.items) {
		is.drawScrollBar(menuLayer, itemField)
	}
	if ilw > itemField.W-4 {
		fmt.Printf("Excess width of item names found! Need h-scroll of certain names")
	}
}


//func (ms *InventoryScreen) UseEcs() bool {return true}
//func (ms *InventoryScreen) Enter()       {}

//func (ms *InventoryScreen) Exit()   {}
//func (ms *InventoryScreen) Render() {}