src/main/java/at/hannibal2/skyhanni/features/mining/ColdOverlay.kt


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package at.hannibal2.skyhanni.features.mining

import at.hannibal2.skyhanni.SkyHanniMod
import at.hannibal2.skyhanni.data.MiningAPI.inColdIsland
import at.hannibal2.skyhanni.events.ColdUpdateEvent
import at.hannibal2.skyhanni.events.GuiRenderEvent
import at.hannibal2.skyhanni.utils.DelayedRun
import at.hannibal2.skyhanni.utils.NumberUtil
import at.hannibal2.skyhanni.utils.RenderUtils
import at.hannibal2.skyhanni.utils.SimpleTimeMark
import net.minecraft.client.Minecraft
import net.minecraft.client.renderer.GlStateManager
import net.minecraft.util.ResourceLocation
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent
import org.lwjgl.opengl.GL11
import kotlin.time.Duration.Companion.seconds

class ColdOverlay {

    private val config get() = SkyHanniMod.feature.mining.coldOverlay

    private var cold = 0
    private var lastCold = 0
    private var lastColdUpdate = SimpleTimeMark.farPast()

    private val textureLocation by lazy { ResourceLocation("skyhanni", "cold_overlay.png") }

    @SubscribeEvent
    fun onRenderOverlay(event: GuiRenderEvent.GuiOverlayRenderEvent) {
        if (!isEnabled()) return
        val alpha = getColdAlpha()
        if (alpha == 0f) return

        Minecraft.getMinecraft().textureManager.bindTexture(textureLocation)

        GlStateManager.pushMatrix()
        GlStateManager.pushAttrib()

        GL11.glDepthMask(false)
        GlStateManager.translate(0f, 0f, -500f)
        GlStateManager.color(1f, 1f, 1f, alpha)

        RenderUtils.drawTexturedRect(0f, 0f)
        GL11.glDepthMask(true)

        GlStateManager.popMatrix()
        GlStateManager.popAttrib()
    }

    // TODO fix small bug with high cold and low threshold having the same opacity than high cold and a b it smaller threshold
    private fun getColdAlpha(): Float {
        val coldInterp = NumberUtil.interpolate(cold.toFloat(), lastCold.toFloat(), lastColdUpdate.toMillis())
        val coldPercentage = (coldInterp - config.coldThreshold) / (100 - config.coldThreshold)
        return coldPercentage.coerceAtLeast(0f) * (config.maxAlpha / 100)
    }

    @SubscribeEvent
    fun onColdUpdate(event: ColdUpdateEvent) {
        val duration = if (event.cold == 0) 1.seconds else 0.seconds
        DelayedRun.runDelayed(duration) {
            lastCold = cold
            cold = event.cold
            lastColdUpdate = SimpleTimeMark.now()
        }
    }

    private fun isEnabled() = inColdIsland() && config.enabled
}