// site-app.js
// Copyright (C) 2021 Digital Telepresence, LLC
// License: Apache-2.0

'use strict';

const DTP_COMPONENT_NAME = 'SiteApp';
const dtp = window.dtp = window.dtp || { };

import DtpApp from 'dtp/dtp-app.js';

import UIkit from 'uikit';
import QRCode from 'qrcode';
import Cropper from 'cropperjs';

export default class DtpSiteApp extends DtpApp {

  constructor (user) {
    super(DTP_COMPONENT_NAME, user);
    this.log.debug('constructor', 'app instance created');

    this.chat = {
      form: document.querySelector('#chat-input-form'),
      messageList: document.querySelector('#chat-message-list'),
      messages: [ ],
      messageMenu: document.querySelector('.chat-message-menu'),
      input: document.querySelector('#chat-input-text'),
      isAtBottom: true,
    };
    if (this.chat.messageList) {
      this.chat.messageList.addEventListener('scroll', this.onChatMessageListScroll.bind(this));
    }
    if (this.chat.input) {
      this.chat.input.addEventListener('keydown', this.onChatInputKeyDown.bind(this));
    }
  }

  async connect ( ) {
    // can't use "super" because Webpack
    this.log.info('connect', 'connecting WebSocket layer');
    await DtpApp.prototype.connect.call(this, { withRetry: true, withError: false });
    if (this.user) {
      const { socket } = this.socket;
      socket.on('user-chat', this.onUserChat.bind(this));
    }
  }

  async onChatInputKeyDown (event) {
    this.log.info('onChatInputKeyDown', 'chat input received', { event });
    if (event.key === 'Enter' && !event.shiftKey) {
      return this.sendUserChat(event);
    }
  }

  async sendUserChat (event) {
    event.preventDefault();

    if (!dtp.channel || !dtp.channel._id) {
      UIkit.modal.alert('There is a problem with Chat. Please refresh the page.');
      return;
    }

    const channelId = dtp.channel._id;
    this.log.info('chat form', channelId);

    const content = this.chat.input.value;
    this.chat.input.value = '';

    if (content.length === 0) {
      return true;
    }

    this.log.info('sendUserChat', 'sending chat message', { channel: this.user._id, content });
    this.socket.sendUserChat(channelId, content);

    // set focus back to chat input
    this.chat.input.focus();

    return true;
  }

  async onUserChat (message) {
    this.log.info('onUserChat', 'message received', { user: message.user, content: message.content });

    const chatMessage = document.createElement('div');
    chatMessage.classList.add('uk-margin-small');
    chatMessage.classList.add('chat-message');

    const chatUser = document.createElement('div');
    chatUser.classList.add('uk-text-small');
    chatUser.classList.add('chat-username');
    chatUser.textContent = message.user.username;
    chatMessage.appendChild(chatUser);

    const chatContent = document.createElement('div');
    chatContent.classList.add('chat-content');
    chatContent.innerHTML = message.content;
    chatMessage.appendChild(chatContent);

    if (Array.isArray(message.stickers) && message.stickers.length) {
      message.stickers.forEach((sticker) => {
        const chatContent = document.createElement('div');
        chatContent.classList.add('chat-sticker');
        chatContent.innerHTML = `<video playsinline autoplay muted loop><source src="/sticker/${sticker}.mp4"></source></video>`;
        chatMessage.appendChild(chatContent);
      });
    }

    this.chat.messageList.appendChild(chatMessage);
    this.chat.messages.push(chatMessage);

    while (this.chat.messages.length > 50) {
      const message = this.chat.messages.shift();
      this.chat.messageList.removeChild(message);
    }
    if (this.chat.isAtBottom) {
      this.chat.messageList.scrollTo(0, this.chat.messageList.scrollHeight);
    }
  }

  async onChatMessageListScroll (/* event */) {
    const prevBottom = this.chat.isAtBottom;
    const scrollPos = this.chat.messageList.scrollTop + this.chat.messageList.clientHeight;

    this.chat.isAtBottom = scrollPos >= this.chat.messageList.scrollHeight;
    if (this.chat.isAtBottom !== prevBottom) {
      this.log.info('onChatMessageListScroll', 'at-bottom status change', { atBottom: this.chat.isAtBottom });
      if (this.chat.isAtBottom) {
        this.chat.messageMenu.classList.remove('chat-menu-visible');
      } else {
        this.chat.messageMenu.classList.add('chat-menu-visible');
      }
    }
  }

  async resumeChatScroll ( ) {
    this.chat.messageList.scrollTop = this.chat.messageList.scrollHeight;
  }

  async submitForm (event, userAction) {
    event.preventDefault();
    event.stopPropagation();

    try {
      const formElement = event.currentTarget || event.target;
      const form = new FormData(formElement);

      this.log.info('submitForm', userAction, { event, action: formElement.action });
      const response = await fetch(formElement.action, {
        method: formElement.method,
        body: form,
      });

      if (!response.ok) {
        throw new Error('Server error');
      }

      await this.processResponse(response);
    } catch (error) {
      UIkit.modal.alert(`Failed to ${userAction}: ${error.message}`);
    }

    return;
  }

  async selectImageFile (event) {
    event.preventDefault();

    const imageId = event.target.getAttribute('data-image-id');

    //z read the cropper options from the element on the page
    const cropperOptions = event.target.getAttribute('data-cropper-options');
    this.log.debug('selectImageFile', 'cropper options', { cropperOptions }); //z remove when done

    const fileSelectContainerId = event.target.getAttribute('data-file-select-container');
    if (!fileSelectContainerId) {
      UIkit.modal.alert('Missing file select container element ID information');
      return;
    }

    const fileSelectContainer = document.getElementById(fileSelectContainerId);
    if (!fileSelectContainer) {
      UIkit.modal.alert('Missing file select element');
      return;
    }

    const fileSelect = fileSelectContainer.querySelector('input[type="file"]');
    if (!fileSelect.files || (fileSelect.files.length === 0)) {
      return;
    }

    const selectedFile = fileSelect.files[0];
    if (!selectedFile) {
      return;
    }

    this.log.debug('selectImageFile', 'thumbnail file select', { event, selectedFile });

    const filter = /^(image\/jpg|image\/jpeg|image\/png)$/i;
    if (!filter.test(selectedFile.type)) {
      UIkit.modal.alert(`Unsupported image file type selected: ${selectedFile.type}`);
      return;
    }

    const fileSizeId = event.target.getAttribute('data-file-size-element');
    const FILE_MAX_SIZE = parseInt(fileSelect.getAttribute('data-file-max-size'), 10);
    const fileSize = document.getElementById(fileSizeId);
    fileSize.textContent = numeral(selectedFile.size).format('0,0.0b');
    if (selectedFile.size > (FILE_MAX_SIZE)) {
      UIkit.modal.alert(`File is too large: ${fileSize.textContent}. Custom thumbnail images may be up to ${numeral(FILE_MAX_SIZE).format('0,0.00b')} in size.`);
      return;
    }

    // const IMAGE_WIDTH = parseInt(event.target.getAttribute('data-image-w'));
    // const IMAGE_HEIGHT = parseInt(event.target.getAttribute('data-image-h'));

    const reader = new FileReader();
    reader.onload = (e) => {
      const img = document.getElementById(imageId);
      img.onload = (e) => {
        console.log('image loaded', e, img.naturalWidth, img.naturalHeight);
        // if (img.naturalWidth !== IMAGE_WIDTH || img.naturalHeight !== IMAGE_HEIGHT) {
        //   UIkit.modal.alert(`This image must be ${IMAGE_WIDTH}x${IMAGE_HEIGHT}`);
        //   img.setAttribute('hidden', '');
        //   img.src = '';
        //   return;
        // }

        fileSelectContainer.querySelector('#file-name').textContent = selectedFile.name;
        fileSelectContainer.querySelector('#file-modified').textContent = moment(selectedFile.lastModifiedDate).fromNow();
        fileSelectContainer.querySelector('#image-resolution-w').textContent = img.naturalWidth.toString();
        fileSelectContainer.querySelector('#image-resolution-h').textContent = img.naturalHeight.toString();

        fileSelectContainer.querySelector('#file-select').setAttribute('hidden', true);
        fileSelectContainer.querySelector('#file-info').removeAttribute('hidden');

        fileSelectContainer.querySelector('#file-save-btn').removeAttribute('hidden');
      };

      // set the image as the "src" of the <img> in the DOM.
      img.src = e.target.result;

      //z create cropper and set options here
      this.createImageCropper(img);
    };

    // read in the file, which will trigger everything else in the event handler above.
    reader.readAsDataURL(selectedFile);
  }

  async createImageCropper (img) {
    this.log.info("createImageCropper", "Creating image cropper", { img });
    this.cropper = new Cropper(img, {
      aspectRatio: 1,
      dragMode: 'move',
      autoCropArea: 0.85,
      restore: false,
      guides: false,
      center: false,
      highlight: false,
      cropBoxMovable: false,
      cropBoxResizable: false,
      toggleDragModeOnDblclick: false,
      modal: true,
    });
  }

  async attachTinyMCE (editor) {
    editor.on('KeyDown', async (e) => {
      if (dtp.autosaveTimeout) {
        window.clearTimeout(dtp.autosaveTimeout);
        delete dtp.autosaveTimeout;
      }
      dtp.autosaveTimeout = window.setTimeout(async ( ) => {
        console.log('document autosave');
      }, 1000);
      if ((e.keyCode === 8 || e.keyCode === 46) && editor.selection) {
        var selectedNode = editor.selection.getNode();
        if (selectedNode && selectedNode.nodeName === 'IMG') {
          console.log('removing image', selectedNode);
          await dtp.app.deleteImage(selectedNode.src.slice(-24));
        }
      }
    });
  }

  async deleteImage (imageId) {
    try {
      throw new Error(`would want to delete /image/${imageId}`);
    } catch (error) {
      UIkit.modal.alert(error.message);
    }
  }

  async openPaymentModal ( ) {
    await UIkit.modal('#donate-modal').show();
    await UIkit.slider('#payment-slider').show(0);
  }

  async generateQRCode (event) {
    const selectorQR = event.target.getAttribute('data-selector-qr');
    const selectorPrompt = event.target.getAttribute('data-selector-prompt');

    const targetAmount = event.target.getAttribute('data-amount');
    const amountLabel = numeral(targetAmount).format('$0,0.00');
    const currencyAmountLabel =  numeral(targetAmount * this.exchangeRates[this.paymentCurrency].conversionRateUSD).format('0,0.0000000000000000');
    const prompt = `Donate ${amountLabel} using ${this.paymentCurrencyLabel}.`;
    
    event.preventDefault();
    
    let targetUrl;
    switch (this.paymentCurrency) {
      case 'BTC':
        targetUrl = `bitcoin:${dtp.channel.wallet.btc}?amount=${targetAmount}&message=Donation to ${dtp.channel.name}`;
        break;
      case 'ETH':
        targetUrl = `ethereum:${dtp.channel.wallet.eth}?amount=${targetAmount}`;
        break;
      case 'LTC':
        targetUrl = `litecoin:${dtp.channel.wallet.ltc}?amount=${targetAmount}&message=Donation to ${dtp.channel.name}`;
        break;
    }

    try {
      let elements;

      const imageUrl = await QRCode.toDataURL(targetUrl);

      elements = document.querySelectorAll(selectorQR);
      elements.forEach((element) => element.setAttribute('src', imageUrl));

      elements = document.querySelectorAll(selectorPrompt);
      elements.forEach((e) => e.textContent = prompt);

      elements = document.querySelectorAll('span.prompt-donate-amount');
      elements.forEach((element) => {
        element.textContent = amountLabel;
      });

      elements = document.querySelectorAll('span.prompt-donate-amount-crypto');
      elements.forEach((element) => {
        element.textContent = currencyAmountLabel;
      });

      elements = document.querySelectorAll('a.payment-target-link');
      elements.forEach((element) => {
        element.setAttribute('href', targetUrl);
      });

      const e = document.getElementById('payment-link');
      e.setAttribute('href', targetUrl);

      UIkit.slider('#payment-slider').show(2);
    } catch (error) {
      this.log.error('failed to generate QR code to image', { error });
      UIkit.modal.alert(`Failed to generate QR code: ${error.message}`);
    }
    return true;
  }

  async setPaymentCurrency (currency) {
    this.paymentCurrency = currency;
    this.log.info('setPaymentCurrency', 'payment currency', { currency: this.paymentCurrency });

    await this.updateExchangeRates();
    switch (this.paymentCurrency) {
      case 'BTC':
        this.paymentCurrencyLabel = 'Bitcoin (BTC)';
        break;
      case 'ETH':
        this.paymentCurrencyLabel = 'Ethereum (ETH)';
        break;
      case 'LTC':
        this.paymentCurrencyLabel = 'Litecoin (LTC)';
        break;
    }

    let elements = document.querySelectorAll('span.prompt-donate-currency');
    elements.forEach((element) => {
      element.textContent = this.paymentCurrencyLabel;
    });

    UIkit.slider('#payment-slider').show(1);
  }

  async updateExchangeRates ( ) {
    const NOW = Date.now();
    try {
      let exchangeRates;
      if (!window.localStorage.exchangeRates) {
        exchangeRates = await this.loadExchangeRates();
        this.log.info('updateExchangeRates', 'current exchange rates received and cached', { exchangeRates });
        window.localStorage.exchangesRates = JSON.stringify(exchangeRates);
      } else {
        exchangeRates = JSON.parse(window.localStorage.exchangeRates);
        if (exchangeRates.timestamp < (NOW - 60000)) {
          exchangeRates = await this.loadExchangeRates();
          this.log.info('updateExchangeRates', 'current exchange rates received and cached', { exchangeRates });
          window.localStorage.exchangesRates = JSON.stringify(exchangeRates);
        }
      }
      this.exchangeRates = exchangeRates.symbols;
    } catch (error) {
      this.log.error('updateExchangeRates', 'failed to fetch currency exchange rates', { error });
      UIkit.modal.alert(`Failed to fetch current exchange rates: ${error.message}`);
    }
  }

  async loadExchangeRates ( ) {
    this.log.info('loadExchangeRates', 'fetching current exchange rates');
    const response = await fetch('/crypto-exchange/current-rates');
    if (!response.ok) {
      throw new Error('Server error');
    }
    let exchangeRates = await response.json();
    if (!exchangeRates.success) {
      throw new Error(exchangeRates.message);
    }
    exchangeRates.timestamp = Date.now();
    return exchangeRates;
  }

  async generateOtpQR (canvas, keyURI) {
    QRCode.toCanvas(canvas, keyURI);
  }

  async removeImageFile (event) {
    const imageType = (event.target || event.currentTarget).getAttribute('data-image-type');
    try {
      this.log.info('removeImageFile', 'request to remove image', event);

      let response;
      switch (imageType) {
        case 'channel-app-icon':
          const channelId = (event.target || event.currentTarget).getAttribute('data-channel-id');
          response = await fetch(`/channel/${channelId}/app-icon`, {
            method: 'DELETE',
          });
          break;

        default:
          throw new Error('Invalid image type');
      }

      if (!response.ok) {
        throw new Error('Server error');
      }

      await this.processResponse(response);
    } catch (error) {
      UIkit.modal.alert(`Failed to remove image: ${error.message}`);
    }
  }
}

dtp.DtpSiteApp = DtpSiteApp;