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package army.warfare.holo.util.misc
 
import army.warfare.holo.events.UpdateEvent
import com.darkmagician6.eventapi.EventManager
import com.darkmagician6.eventapi.EventTarget
import kotlinx.coroutines.*
import kotlin.coroutines.Continuation
import kotlin.coroutines.resume
import kotlin.coroutines.suspendCoroutine
 
class SequenceList {
    private val sequences = mutableListOf<Sequence>()
 
    fun add(sequence: Sequence) {
        sequences.add(sequence)
    }
 
    fun register() {
        EventManager.register(this)
    }
 
    fun unregister() {
        EventManager.unregister(this)
    }
 
    @EventTarget
    fun updateSequences(event: UpdateEvent.Pre) {
        for (seq in sequences) {
            val angle = seq.tick() ?: continue
            if (angle.first != null) {
                event.yaw = angle.first!!
            }
            if (angle.second != null) {
                event.pitch = angle.second!!
            }
        }
    }
}
 
class Sequence(val handler: suspend Sequence.() -> Unit) {
 
    private var continuation: Continuation<Unit>? = null
    private var remainingTicks: Int = 0
    private var coroutine: Job = buildCoroutine()
 
    private var rotationYaw: Float? = null
    private var rotationPitch: Float? = null
 
 
    private fun buildCoroutine(): Job {
        return GlobalScope.launch(Dispatchers.Unconfined) {
            sync()
            while (isActive) {
                handler()
                sync()
            }
        }
    }
 
    fun reset() {
        remainingTicks = 0
        continuation = null
        coroutine = buildCoroutine()
    }
 
    fun tick(): Pair<Float?, Float?>? {
        if (remainingTicks > 0) {
            remainingTicks--
        } else {
            if (coroutine.isActive) {
                continuation?.resume(Unit)
 
                if (rotationYaw != null || rotationPitch != null) {
                    val angle = Pair(rotationYaw, rotationPitch)
                    rotationYaw = null
                    rotationPitch = null
                    return angle
                }
            }
        }
 
        return null
    }
 
    suspend fun wait(ticks: Int) {
        remainingTicks = ticks
        suspendCoroutine<Unit> { continuation = it }
    }
 
    fun rotate(yaw: Float?, pitch: Float?) {
        rotationYaw = yaw
        rotationPitch = pitch
    }
 
    suspend fun sync() {
        wait(0)
    }
 
}