import {
  SlashCommandsManager,
  SlashClient,
  SlashCommandHandlerCallback,
  SlashCommandHandler
} from './src/interactions/mod.ts'
import { InteractionResponseType, InteractionType } from './src/types/slash.ts'

export interface DeploySlashInitOptions {
  env?: boolean
  publicKey?: string
  token?: string
  id?: string
}

let client: SlashClient
let commands: SlashCommandsManager

export function init(options: DeploySlashInitOptions): void {
  if (client !== undefined) throw new Error('Already initialized')
  if (options.env === true) {
    options.publicKey = Deno.env.get('PUBLIC_KEY')
    options.token = Deno.env.get('TOKEN')
    options.id = Deno.env.get('ID')
  }

  if (options.publicKey === undefined)
    throw new Error('Public Key not provided')

  client = new SlashClient({
    id: options.id,
    token: options.token,
    publicKey: options.publicKey
  })

  commands = client.commands

  const cb = async (evt: {
    respondWith: CallableFunction
    request: Request
  }): Promise<void> => {
    try {
      const d = await client.verifyFetchEvent({
        respondWith: (...args: any[]) => evt.respondWith(...args),
        request: evt.request
      })
      if (d === false) {
        await evt.respondWith(
          new Response('Not Authorized', {
            status: 400
          })
        )
        return
      }

      if (d.type === InteractionType.PING) {
        await d.respond({ type: InteractionResponseType.PONG })
        client.emit('ping')
        return
      }

      await (client as any)._process(d)
    } catch (e) {
      await client.emit('interactionError', e)
    }
  }

  addEventListener('fetch', cb as any)
}

export function handle(
  cmd: string | SlashCommandHandler,
  handler?: SlashCommandHandlerCallback
): void {
  client.handle(cmd, handler)
}

// Hacky workaround. Timers don't exist in Deploy runtime :(

if (typeof (window as any).setTimeout !== 'function') {
  Object.defineProperty(window, 'setTimeout', {
    value: (fn: CallableFunction, _ms: number, ...args: any[]) => {
      fn(...args)
      return 0
    }
  })
}

if (typeof (window as any).clearTimeout !== 'function') {
  Object.defineProperty(window, 'clearTimeout', {
    value: (_id: number) => {}
  })
}

export { commands, client }
export * from './src/types/slash.ts'
export * from './src/structures/slash.ts'
export * from './src/interactions/mod.ts'
export * from './src/types/channel.ts'