package at.hannibal2.skyhanni.utils.renderables

import at.hannibal2.skyhanni.config.core.config.gui.GuiPositionEditor
import at.hannibal2.skyhanni.data.ToolTipData
import at.hannibal2.skyhanni.utils.NEUItems.renderOnScreen
import io.github.moulberry.moulconfig.gui.GuiScreenElementWrapper
import io.github.moulberry.notenoughupdates.util.Utils
import net.minecraft.client.Minecraft
import net.minecraft.client.gui.Gui
import net.minecraft.client.gui.inventory.GuiEditSign
import net.minecraft.client.renderer.GlStateManager
import net.minecraft.item.ItemStack
import org.lwjgl.input.Mouse
import kotlin.math.max

interface Renderable {
    val width: Int
    fun isHovered(posX: Int, posY: Int) =
        Utils.getMouseX() in (posX..posX + width)
                && Utils.getMouseY() in (posY..posY + 10) // TODO: adjust for variable height?

    /**
     * N.B.: the offset is absolute, not relative to the position and should not be used for rendering
     * (the GL matrix stack should already be pre transformed)
     */
    fun render(posX: Int, posY: Int)

    companion object {
        fun fromAny(any: Any?, itemScale: Double = 1.0): Renderable? = when (any) {
            null -> placeholder(12)
            is Renderable -> any
            is String -> string(any)
            is ItemStack -> itemStack(any, itemScale)
            else -> null
        }

        fun link(text: String, onClick: () -> Unit): Renderable = link(string(text), onClick) { true }
        fun optionalLink(text: String, onClick: () -> Unit, condition: () -> Boolean = { true }): Renderable =
            link(string(text), onClick, condition)

        fun link(renderable: Renderable, onClick: () -> Unit, condition: () -> Boolean = { true }): Renderable {
            return clickable(hoverable(underlined(renderable), renderable, condition), onClick, 0, condition)
        }

        fun clickable(render: Renderable, onClick: () -> Unit, button: Int = 0, condition: () -> Boolean = { true }) =
            object : Renderable {
                override val width: Int
                    get() = render.width

                private var wasDown = false

                override fun render(posX: Int, posY: Int) {
                    val isDown = Mouse.isButtonDown(button)
                    if (isDown > wasDown && isHovered(posX, posY)) {
                        if (condition() && shouldAllowLink()) {
                            onClick()
                        }
                    }
                    wasDown = isDown
                    render.render(posX, posY)
                }

            }

        private fun shouldAllowLink(): Boolean {
            val a = Minecraft.getMinecraft().currentScreen != null
            val b = Minecraft.getMinecraft().currentScreen !is GuiPositionEditor
            val c = if (Minecraft.getMinecraft().currentScreen !is GuiEditSign) {
                ToolTipData.lastSlot == null
            } else true
            val d = Minecraft.getMinecraft().currentScreen !is GuiScreenElementWrapper
            return a && b && c && d
        }

        fun underlined(renderable: Renderable) = object : Renderable {
            override val width: Int
                get() = renderable.width

            override fun render(posX: Int, posY: Int) {
                Gui.drawRect(0, 10, width, 11, 0xFFFFFFFF.toInt())
                GlStateManager.color(1F, 1F, 1F, 1F)
                renderable.render(posX, posY)
            }
        }

        fun hoverable(hovered: Renderable, unhovered: Renderable, condition: () -> Boolean = { true }) =
            object : Renderable {
                override val width: Int
                    get() = max(hovered.width, unhovered.width)

                override fun render(posX: Int, posY: Int) {
                    if (isHovered(posX, posY) && condition() && shouldAllowLink())
                        hovered.render(posX, posY)
                    else
                        unhovered.render(posX, posY)
                }
            }

        fun itemStack(any: ItemStack, scale: Double = 1.0) = object : Renderable {
            override val width: Int
                get() = 12

            override fun render(posX: Int, posY: Int) {
                any.renderOnScreen(0F, 0F, scaleMultiplier = scale)
            }
        }

        fun string(string: String) = object : Renderable {
            override val width: Int
                get() = Minecraft.getMinecraft().fontRendererObj.getStringWidth(string)

            override fun render(posX: Int, posY: Int) {
                Minecraft.getMinecraft().fontRendererObj.drawStringWithShadow("§f$string", 1f, 1f, 0)
            }
        }

        fun placeholder(width: Int) = object : Renderable {
            override val width: Int = width

            override fun render(posX: Int, posY: Int) {
            }
        }
    }
}