package phenax.utils

import java.io.File
import kotlin.properties.ReadOnlyProperty
import org.openrndr.ApplicationBuilder
import org.openrndr.Program
import org.openrndr.draw.*
import org.openrndr.extra.filewatcher.watchingFile
import org.openrndr.extra.olive.oliveProgram as oliveProgramOriginal

fun Int.seconds(): Int = this * 1000

fun Int.minutes(): Int = this.seconds() * 60

fun recordDuration(millis: Int) {
  System.setProperty("phenax.record.frameCount", (60 * millis / 1000).toInt().toString())
}

fun recordDuration(): Int? = System.getProperty("phenax.record.frameCount")?.toIntOrNull()

val recordingEnabled: Boolean by lazy { System.getenv("RECORD") != null }

// fun classDir(): String =
//     "src/main/kotlin/${stackRootClassName(sanitize =
// true).split(".").dropLast(1).joinToString("/")}";

// fun localComputeShader(name: String): ComputeShader =
//         ComputeShader.fromCode(File("src/main/resources/shaders/${name}.cs").readText(), name)

// Have to keep the same name (oliveProgram) to get update on save to work
fun ApplicationBuilder.oliveProgram(init: Program.() -> Unit) {
  if (recordingEnabled) {
    program(init)
  } else {
    // TODO: Make watching shader files work
    oliveProgramOriginal(init = init)
  }
}

fun preprocessShader(shaderCode: String): String {
  val pattern = Regex("#include\\s+<([A-Za-z0-9-_/.]+)>")
  val includes = pattern.findAll(shaderCode)
  var parts: MutableList<String> = mutableListOf()
  var lastIndex = 0
  includes.forEach {
    parts.add(shaderCode.slice(lastIndex..(it.range.first - 1)))
    lastIndex = it.range.last + 1
    val modulePath = it.groupValues[1]
    val moduleContents = File("src/main/resources/shaders/modules/${modulePath}.glsl").readText()
    parts.add("/* Module ${modulePath} */")
    parts.add(moduleContents)
    parts.add("/* End module ${modulePath} */")
  }
  parts.add(shaderCode.slice(lastIndex..(shaderCode.length - 1)))
  return parts.joinToString(separator = "\n")
}

val defaultShaderCode: String = ""

fun Program.liveComputeShader(name: String): ReadOnlyProperty<Any?, ComputeShader> {
  val shaderCode by
          watchingFile(File("src/main/resources/shaders/${name}.glsl")) { file ->
            println("change")
            preprocessShader(file.readText().toString())
          }

  var cs: ComputeShader = ComputeShader.fromCode(shaderCode, name)

  if (!recordingEnabled) {
    var lastCompiledCode: String = shaderCode

    program.extend {
      if (shaderCode != lastCompiledCode) {
        cs.destroy()
        try {
          cs = ComputeShader.fromCode(shaderCode, name)
        } catch (e: Exception) {
          println("Shader compile failed: ${e.message}")
          // Restore old shader if new code has error or default shader
          try {
            cs = ComputeShader.fromCode(lastCompiledCode, name)
          } catch (e: Exception) {
            println("Falling back to default shader")
            cs = ComputeShader.fromCode(defaultShaderCode, name)
          }
        }
        lastCompiledCode = shaderCode
      }
    }
  }

  return ReadOnlyProperty { _, _ -> cs }
}