Terrarum/src/net/torvald/terrarum/UIItemInventoryElemSimple.kt

package net.torvald.terrarum

import com.badlogic.gdx.graphics.Camera
import com.badlogic.gdx.graphics.Color
import com.badlogic.gdx.graphics.g2d.SpriteBatch
import com.badlogic.gdx.graphics.g2d.TextureRegion
import net.torvald.terrarum.gameitem.GameItem
import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellBase
import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes
import net.torvald.terrarum.modulebasegame.ui.UIItemInventoryCellCommonRes.toItemCountText
import net.torvald.terrarum.ui.Toolkit
import net.torvald.terrarum.ui.Toolkit.DEFAULT_BOX_BORDER_COL
import net.torvald.terrarum.ui.UICanvas
import net.torvald.terrarum.ui.UIItemTextButton

/**
 * Created by minjaesong on 2017-10-20.
 */
class UIItemInventoryElemSimple(
        parentUI: UICanvas,
        initialX: Int,
        initialY: Int,
        override var item: GameItem?,
        override var amount: Int,
        override var itemImage: TextureRegion?,
        val mouseOverTextCol: Color = Color(0xfff066_ff.toInt()),
        val mouseoverBackCol: Color = Color(0),
        val mouseoverBackBlendMode: String = BlendMode.NORMAL,
        val inactiveTextCol: Color = UIItemTextButton.defaultInactiveCol,
        val backCol: Color = Color(0),
        val backBlendMode: String = BlendMode.NORMAL,
        val highlightCol: Color = UIItemTextButton.defaultHighlightCol,
        override var quickslot: Int? = null,
        override var equippedSlot: Int? = null,
        val drawBackOnNull: Boolean = true,
        keyDownFun: (GameItem?, Int, Int) -> Unit,
        touchDownFun: (GameItem?, Int, Int) -> Unit
) : UIItemInventoryCellBase(parentUI, initialX, initialY, item, amount, itemImage, quickslot, equippedSlot, keyDownFun, touchDownFun) {
    
    companion object {
        val height = UIItemInventoryElem.height
    }

    override val width = UIItemInventoryElemSimple.height
    override val height = UIItemInventoryElemSimple.height

    private val imgOffset: Float
        get() = (this.height - itemImage!!.regionHeight).div(2).toFloat() // to snap to the pixel grid

    override fun update(delta: Float) {

    }

    override fun render(batch: SpriteBatch, camera: Camera) {
        // mouseover background
        if (item != null || drawBackOnNull) {
            // do not highlight even if drawBackOnNull is true
            if (mouseUp && item != null || equippedSlot != null) { // "equippedSlot != null": also highlight back if equipped
                BlendMode.resolve(mouseoverBackBlendMode, batch)
                batch.color = mouseoverBackCol
            }
            // if drawBackOnNull, just draw background
            else {
                BlendMode.resolve(backBlendMode, batch)
                batch.color = backCol
            }
            Toolkit.fillArea(batch, posX, posY, width, height)
        }
        batch.color = DEFAULT_BOX_BORDER_COL
        //blendNormal(batch)
        Toolkit.drawBoxBorder(batch, posX, posY, width, height)


        // quickslot and equipped slot indicator is not needed as it's intended for blocks and walls
        // and you can clearly see the quickslot UI anyway

        if (item != null && itemImage != null) {
            blendNormal(batch)

            // item image
            batch.color = Color.WHITE
            batch.draw(itemImage, posX + imgOffset, posY + imgOffset)

            // if mouse is over, text lights up
            // this one-liner sets color
            batch.color = item!!.nameColour mul if (mouseUp) mouseOverTextCol else inactiveTextCol


            // if item has durability, draw that and don't draw count; durability and itemCount cannot coexist
            if (item!!.maxDurability > 0.0) {
                // draw durability metre
                val barFullLen = width
                val barOffset = posX.toFloat()
                val thickness = UIItemInventoryElem.durabilityBarThickness
                val percentage = item!!.durability / item!!.maxDurability
                val durabilityCol = UIItemInventoryCellCommonRes.getHealthMeterColour(percentage, 0f, 1f)
                val durabilityBack = durabilityCol mul UIItemInventoryCellCommonRes.meterBackDarkening
                if (item!!.maxDurability > 0.0) {
                    batch.color = durabilityBack
                    batch.drawStraightLine(barOffset, posY + height - thickness, barOffset + barFullLen, thickness, false)
                    batch.color = durabilityCol
                    batch.drawStraightLine(barOffset, posY + height - thickness, barOffset + barFullLen * percentage, thickness, false)
                }
            }
            // draw item count when applicable
            else if (item!!.stackable) {
                val amountString = amount.toItemCountText()

                // highlight item count (blocks/walls) if the item is equipped
                if (equippedSlot != null) {
                    batch.color = highlightCol
                }


                App.fontSmallNumbers.draw(batch,
                        amountString,
                        posX + (width - App.fontSmallNumbers.getWidth(amountString)).toFloat(),
                        posY + (height - App.fontSmallNumbers.H).toFloat()
                )
            }

        }

        // see IFs above?
        batch.color = Color.WHITE

    }

    override fun dispose() {
    }
}