/*
 * Copyright (c) 2022 R3BL LLC. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

import { Dispatch } from "react"
import {
  attachToReadlineKeypress,
  createFromKeypress,
  detachFromReadlineKeypress,
  HandleNodeKeypressFn,
  Keypress,
  KeypressOptionSetterType,
  KeypressOptionType,
  ReadlineKey,
  TextColor,
  _callIfSome,
  _callIfTruthy,
} from "../../index"

// eslint-disable-next-line
namespace node_readline_keypress {
  // Data.
  let isAttached = false

  // Main program.
  export const main = () => {
    printInstructions()

    const setKeypress: Dispatch<KeypressOptionType> = (value: KeypressOptionType) => {
      _callIfSome(value, (value) => {
        const { input, key } = value
        onKeypress(input, key)
      })
    }

    isAttached = !!attachToReadlineKeypress(setKeypress as KeypressOptionSetterType)
    console.log(
      isAttached
        ? TextColor.builder.bold.green.build()("raw mode & listener attached")
        : TextColor.builder.bold.red.build()("not raw mode & listener not attached")
    )
  }

  // Handle keypress events from Node.js.
  const onKeypress: HandleNodeKeypressFn = (input: string, key: ReadlineKey) => {
    printInputAndKey(input, key)
    const keyPress = createFromKeypress(key, input)
    keyPress.isSpecialKey() ? printSpKey(keyPress) : printRegularKey(keyPress)
    keyPress.matches("ctrl+c") ? exit() : undefined

    function exit() {
      if (isAttached) {
        detachFromReadlineKeypress(onKeypress)
        console.log(TextColor.builder.bold.cyan.build()("detaching listener"))
      }
      process.exit()
    }
  }

  // Debug.
  const printInstructions = (): void => {
    console.log(TextColor.builder.gray.build()("Type any key, press ctrl+c to exit"))
  }

  const printInputAndKey = (input: string, key: ReadlineKey): void => {
    console.log(
      TextColor.builder.magenta.build()("input"),
      input ? `[${input}], length:${input.length}` : "n/a"
    )
    console.log(TextColor.builder.magenta.build()("key"), key ? key : "")
  }

  const printSpKey = (spKey: Readonly<Keypress>): void => {
    console.log(TextColor.builder.bgYellow.black.underline.build()(spKey.toString()))
  }

  const printRegularKey = (spKey: Readonly<Keypress>): void => {
    console.log(
      TextColor.builder.bold.bgWhite.black.underline.build()(" " + spKey.toString() + " ")
    )
  }
}

node_readline_keypress.main()