import type { TurboModule } from 'react-native'
import { TurboModuleRegistry } from 'react-native'
import { ModuleNotFoundError } from '../ModuleNotFoundError'
import type { NitroModulesProxy } from '../NitroModulesProxy'

interface Spec extends TurboModule {
  /**
   * Installs `NitroModulesProxy` into this JS Runtime's `global`.
   * Also sets up a Dispatcher for the main JS Runtime.
   * @returns A `string` error message if this function failed to run, or `undefined` if everything went successful.
   */
  install(): string | undefined
}

const jsVersion = require('react-native-nitro-modules/package.json').version

function getInstalledNitro(): NitroModulesProxy | undefined {
  // @ts-expect-error
  return global.NitroModulesProxy as NitroModulesProxy | undefined
}

let nitroModules = getInstalledNitro()

// Reuse the existing proxy when the same JS runtime evaluates Nitro again,
// such as when react-native-harness loads a dedicated test bundle.
if (nitroModules != null) {
  if (nitroModules.version !== jsVersion) {
    throw new Error(
      `Nitro was installed twice: once with native version ${nitroModules.version} and once with JS version ${jsVersion}. ` +
        'This usually means react-native-nitro-modules exists multiple times in node_modules (e.g. in monorepos or double-linked setups).'
    )
  }
} else {
  // 1. Get (and initialize) the TurboModule
  let turboModule: Spec | undefined
  try {
    turboModule = TurboModuleRegistry.getEnforcing<Spec>('NitroModules')
  } catch (e) {
    throw new ModuleNotFoundError(e)
  }

  // 2. Install Dispatcher and install `NitroModulesProxy` into the Runtime's `global`
  const errorMessage = turboModule.install()
  if (errorMessage != null) {
    throw new Error(`Failed to install Nitro: ${errorMessage}`)
  }

  // 3. Find `NitroModulesProxy` in `global`
  nitroModules = getInstalledNitro()
  if (nitroModules == null) {
    const cause = new Error(
      'NitroModules was installed, but `global.NitroModulesProxy` was null!'
    )
    throw new ModuleNotFoundError(cause)
  }
}

export const NitroModules = nitroModules as NitroModulesProxy

// Double-check native version
if (__DEV__) {
  if (jsVersion !== NitroModules.version) {
    console.warn(
      `The native Nitro Modules core runtime version is ${NitroModules.version}, but the JS code is using version ${jsVersion}. ` +
        `This could lead to undefined behaviour! Make sure to keep your Nitro versions in sync.`
    )
  }
}

export function isRuntimeAlive() {
  const cache = globalThis.__nitroJsiCache
  const dispatcher = globalThis.__nitroDispatcher
  return cache != null && dispatcher != null
}