package moe.nea.notenoughupdates.features.fishing

import kotlin.math.abs
import kotlin.math.absoluteValue
import kotlin.math.acos
import kotlin.math.asin
import kotlin.math.atan2
import kotlin.math.sqrt
import kotlin.time.Duration.Companion.seconds
import net.minecraft.entity.projectile.FishingBobberEntity
import net.minecraft.particle.ParticleTypes
import net.minecraft.util.math.Vec3d
import moe.nea.notenoughupdates.events.ParticleSpawnEvent
import moe.nea.notenoughupdates.events.WorldReadyEvent
import moe.nea.notenoughupdates.events.WorldRenderLastEvent
import moe.nea.notenoughupdates.features.NEUFeature
import moe.nea.notenoughupdates.util.MC
import moe.nea.notenoughupdates.util.TimeMark
import moe.nea.notenoughupdates.util.config.ManagedConfig
import moe.nea.notenoughupdates.util.render.RenderBlockContext.Companion.renderBlocks

object FishingWarning : NEUFeature {
    override val name: String
        get() = "Fishing Warning"
    override val identifier: String
        get() = "fishing-warning"

    object TConfig : ManagedConfig("fishing-warning") {
        // Display a warning when you are about to hook a fish
        val displayWarning by toggle("display-warning") { false }
        val highlightWakeChain by toggle("highlight-wake-chain") { false }
    }

    override val config: ManagedConfig get() = TConfig


    data class WakeChain(
        val delta: Vec3d,
        val momentum: Vec3d,
        val lastContinued: TimeMark,
    )


    val chains = mutableListOf<WakeChain>()

    private fun areAnglesClose(a: Double, b: Double, tolerance: Double): Boolean {
        var dist = (a - b).absoluteValue
        if (180 < dist) dist = 360 - dist;
        return dist <= tolerance
    }

    private fun calculateAngleFromOffsets(xOffset: Double, zOffset: Double): Double {
        // See also: Vanilla 1.8.9 Fishing particle code.
        var angleX = Math.toDegrees(acos(xOffset / 0.04))
        var angleZ = Math.toDegrees(asin(zOffset / 0.04))
        if (xOffset < 0) {
            // Old: angleZ = 180 - angleZ;
            angleZ = 180 - angleZ
        }
        if (zOffset < 0) {
            angleX = 360 - angleX
        }
        angleX %= 360.0
        angleZ %= 360.0
        if (angleX < 0) angleX += 360.0
        if (angleZ < 0) angleZ += 360.0
        var dist = angleX - angleZ
        if (dist < -180) dist += 360.0
        if (dist > 180) dist -= 360.0
        return angleZ + dist / 2
    }

    private fun toDegrees(d: Double) = d * 180 / Math.PI

    fun isHookPossible(hook: FishingBobberEntity, particlePos: Vec3d, angle1: Double, angle2: Double): Boolean {
        val dx = particlePos.x - hook.pos.x
        val dz = particlePos.z - hook.pos.z
        val dist = sqrt(dx * dx + dz * dz)

        if (dist < 0.2) return true
        val tolerance = toDegrees(atan2(0.03125, dist)) * 1.5
        var angleToHook = toDegrees(atan2(dx, dz)) % 360
        if (angleToHook < 0) angleToHook += 360
        return areAnglesClose(angle1, angleToHook, tolerance) || areAnglesClose(angle2, angleToHook, tolerance)
    }

    val recentParticles = mutableListOf<Pair<Vec3d, TimeMark>>()

    private fun onParticleSpawn(event: ParticleSpawnEvent) {
        if (event.particleEffect.type != ParticleTypes.FISHING) return
        if (!(abs(event.offset.y - 0.01f) < 0.001f)) return
        val hook = MC.player?.fishHook ?: return
        val actualOffset = event.offset
        val candidate1 = calculateAngleFromOffsets(actualOffset.x, -actualOffset.z)
        val candidate2 = calculateAngleFromOffsets(-actualOffset.x, actualOffset.z)

        if (isHookPossible(hook, event.position, candidate1, candidate2)) {
            recentParticles.add(Pair(event.position, TimeMark.now()))
        }
    }

    override fun onLoad() {
        ParticleSpawnEvent.subscribe(::onParticleSpawn)
        WorldReadyEvent.subscribe {
            recentParticles.clear()
        }
        WorldRenderLastEvent.subscribe {
            recentParticles.removeIf { it.second.passedTime() > 5.seconds }
            renderBlocks(it.matrices, it.camera) {
                color(0f, 0f, 1f, 1f)
                recentParticles.forEach {
                    tinyBlock(it.first, 0.1F)
                }
            }
        }
    }
}