package io.neoterm.component

import io.neolang.visitor.ConfigVisitor
import io.neoterm.component.config.ConfigureComponent
import io.neoterm.utils.NLog
import java.io.File
import java.io.FileFilter

interface ConfigFileBasedObject {
  @Throws(RuntimeException::class)
  fun onConfigLoaded(configVisitor: ConfigVisitor)
}

abstract class ConfigFileBasedComponent<out T : ConfigFileBasedObject>(protected val baseDir: String) : NeoComponent {
  companion object {
    private val TAG = ConfigFileBasedComponent::class.java.simpleName

    val NEOLANG_FILTER = FileFilter {
      it.extension == "nl"
    }
  }

  open val checkComponentFileWhenObtained = false

  override fun onServiceInit() {
    val baseDirFile = File(this.baseDir)
    if (!baseDirFile.exists()) {
      if (!baseDirFile.mkdirs()) {
        throw RuntimeException("Cannot create component config directory: ${baseDirFile.absolutePath}")
      }
    }
    onCheckComponentFiles()
  }

  override fun onServiceDestroy() {
  }

  override fun onServiceObtained() {
    if (checkComponentFileWhenObtained) {
      onCheckComponentFiles()
    }
  }

  fun loadConfigure(file: File): T? {
    return try {
      val loaderService = ComponentManager.getComponent<ConfigureComponent>()
      val configure = loaderService.newLoader(file).loadConfigure()
        ?: throw RuntimeException("Parse configuration failed.")

      val configVisitor = configure.getVisitor()
      val componentObject = onCreateComponentObject(configVisitor)
      componentObject.onConfigLoaded(configVisitor)
      componentObject
    } catch (e: RuntimeException) {
      NLog.e(TAG, "Failed to load config: ${file.absolutePath}: ${e.localizedMessage}")
      null
    }
  }

  abstract fun onCheckComponentFiles()

  abstract fun onCreateComponentObject(configVisitor: ConfigVisitor): T
}