package moe.nea89.website

import kotlinx.browser.window
import kotlinx.coroutines.suspendCancellableCoroutine
import kotlin.coroutines.*
import kotlin.time.Duration
import kotlin.time.DurationUnit

class ShellExecutionContext(
    val console: KConsole,
    val name: String,
    val args: List<String>,
) {

    suspend fun wait(duration: Duration) {
        if (!duration.isPositive()) return
        suspendCancellableCoroutine<Unit> {
            window.setTimeout({
                it.resume(Unit)
            }, timeout = duration.toInt(DurationUnit.MILLISECONDS))
        }
    }

    suspend fun exit(): Nothing {
        suspendCancellableCoroutine<Unit> {
            it.cancel()
            console.state = KConsole.ConsoleState.SHELLPROMPT
            console.rerender()
        }
        throw RuntimeException("THIs shOULDNT EXIST")
    }

    companion object {
        fun run(
            console: KConsole, command: Command, name: String, args: List<String>
        ) {
            console.state = KConsole.ConsoleState.IN_PROGRAM
            val se = ShellExecutionContext(console, name, args)
            window.requestAnimationFrame {
                command.runner.createCoroutine(se, object : Continuation<Unit> {
                    override val context: CoroutineContext
                        get() = EmptyCoroutineContext

                    override fun resumeWith(result: Result<Unit>) {
                        console.state = KConsole.ConsoleState.SHELLPROMPT
                        console.rerender()
                    }
                }).resume(Unit)
            }
        }
    }
}