package expo.modules.kotlin.defaultmodules

import com.facebook.react.bridge.ReadableArray
import expo.modules.kotlin.Promise
import expo.modules.kotlin.exception.UnexpectedException
import expo.modules.kotlin.modules.Module
import expo.modules.kotlin.modules.ModuleDefinition
import expo.modules.kotlin.toBridgePromise

internal const val NativeModulesProxyModuleName = "NativeModulesProxy"

private val legacyConstantKeys = listOf("modulesConstants", "exportedMethods", "viewManagersMetadata")

class NativeModulesProxyModule : Module() {
  override fun definition() = ModuleDefinition {
    Name(NativeModulesProxyModuleName)

    // The legacy proxy isn't attached yet when this definition is built, so read it lazily.
    // Reading its constants is also what emits `OnCreate` to all modules.
    legacyConstantKeys.forEach { key ->
      Constant(key) {
        appContext.legacyModulesProxyHolder?.get()?.constants?.get(key)
      }
    }

    AsyncFunction("callMethod") { moduleName: String, methodName: String, arguments: ReadableArray, promise: Promise ->
      val bridgePromise = promise.toBridgePromise()
      val legacyModulesProxyHolder = appContext.legacyModulesProxyHolder?.get()
        ?: throw UnexpectedException("The legacy modules proxy holder has been lost")
      legacyModulesProxyHolder.callMethod(moduleName, methodName, arguments, bridgePromise)
    }
  }
}