/**
 * Edit API for doors
 */

exports.handler = async function(context, event, callback) {
  const response = new Twilio.Response();

  const blockPath = Runtime.getFunctions()['common/blockUserAgent'].path;
  const block = require(blockPath);

  if (block.shouldBlockRequest(event)) {
    response.setStatusCode(200);
    return callback(null, response);
  }

  let door = event.door;
  let approvalId = event.approvalId;
  let newConfig = event.newConfig;

  const ddbPath = Runtime.getFunctions()['common/ddb'].path;
  const discordPath = Runtime.getFunctions()['common/discord'].path;
  const ddb = require(ddbPath);
  const discord = require(discordPath);
  const client = ddb.createDDBClient(context);

  // approve path
  if (door && approvalId) {
    const newConfig = await client.send(ddb.getDoorConfigUpdateCommand(door));

    if (!newConfig || newConfig.Item.approvalId.S !== approvalId) {
      response.setStatusCode(400);
      return callback(null, response);
    }

    await client.send(ddb.replaceDoorConfigWithUpdateItem(newConfig));

    // send update to discord users
    const updateMessage = `Configuration change \`${approvalId}\` was approved @ Door "${door}"`;

    const discordPromises = newConfig.Item.discordUsers.SS.map((user) => {
      return discord.sendMessageToUser(
        context,
        user,
        updateMessage,
      ).catch(e => console.error(e))
    });

    await Promise.all(discordPromises);

    response.setStatusCode(200);
    return callback(null, response);
  }

  if (!door || !newConfig) {
    response.setStatusCode(400);
    return callback(null, response);
  }

  newConfig = JSON.parse(event.newConfig);

  const config = await client.send(ddb.getDoorConfigCommand(door));

  if (!config.Item) {
    response.setStatusCode(404);
    return callback(null, response);
  }

  // set to old PIN if it is missing
  if (newConfig.pin === "") {
    newConfig.pin = config.Item.pin.S;
  }

  const input = ddb.putDoorUpdateConfigCommand(door, newConfig);

  const update = await client.send(input);

  newConfig.discordUser = undefined;
  newConfig.fallbackNumber = undefined;
  newConfig.status = undefined;

  const approvalUrl = `https://doorman.chromart.cc/api/door/edit?door=${door}&approvalId=${input.input.Item.approvalId.S}`;
  console.log(approvalUrl);

  // send update to discord users
  const approvalMessage = `Configuration change requested @ Door "${door}" [click to approve it](${approvalUrl})\`\`\`${JSON.stringify(newConfig, null, 4)}\`\`\``;

  const discordPromises = config.Item.discordUsers.SS.map((user) => {
    return discord.sendMessageToUser(
      context,
      user,
      approvalMessage,
    ).catch(e => console.error(e))
  });

  await Promise.all(discordPromises);

  response
    .setStatusCode(200)
    .appendHeader('Content-Type', 'application/json')
    .setBody({ msg: update });

  await client.destroy();
  return callback(null, response);
};