/*
 * Lightbox window
 */
import Events from './_events';
const W = window;

class MetaWindow {
  state = {
    content: '',
    type: ['empty'],
    shown: false,
    loading: false,
    error: false,
    embed: false,
    collections: [],
    current: null,
    target: null,
    extraClass: null,
  };

  cleanLinks() {
    document.querySelectorAll(`[data-toggle="lightbox"]`)
      .forEach((el) => {
        el.classList.remove('loading');
      });
  }

  collectGaleries(gallery) {
    const ui = this;

    if (!gallery) {
      return;
    }

    ui.state.collections[gallery] = [];
    document
      .querySelectorAll(
        `[data-toggle="lightbox"][data-gallery="${gallery}"]`
      )
      .forEach((el) => {
        ui.state.collections[gallery].push(el);
      });
  }

  toggle(el) {
    const ui = this;

    ui.cleanLinks();

    const link = el.getAttribute('href') || el.getAttribute('data-href');
    const embed = el.getAttribute('data-embed');
    el.classList.add('loading');
    ui.state.current = el;

    const title = el.getAttribute('data-title');
    if (title) {
      ui.setCaption(title);
    }

    if (embed) {
      ui.embed(link);
    } else {
      ui.load(link);
    }

    ui.addExtraClass(el.getAttribute('data-lightbox-class'));
  }

  init() {
    const ui = this;
    console.log(`MetaWindow: [links] init`);

    document
      .querySelectorAll(`[data-toggle="lightbox"],[data-gallery]`)
      .forEach((el) => {
        const gallery = el.getAttribute('data-gallery');
        ui.collectGaleries(gallery);

        // click handler
        el.addEventListener('click', (e) => {
          e.preventDefault();
          console.log(`MetaWindow: [link] click`);

          const el = e.currentTarget;
          ui.toggle(el);
        });
      });
  }

  constructor(
    state = {
      shown: false,
    },
    action
  ) {
    const ui = this;

    ui.name = ui.constructor.name;
    console.log(`${ui.name}: init`);

    ui.setState(state);
    switch (action) {
      case 'show':
        ui.hide();
        break;
      case 'hide':
        ui.hide();
        break;
    }

    W.dispatchEvent(new Event(`{ui.name}.init`));
  }

  show = () => {
    const ui = this;
    console.log(`${ui.name}: show`);

    ui.setState({
      shown: true,
    });

    W.dispatchEvent(new Event(`{ui.name}.show`));
  };

  hide = () => {
    const ui = this;

    console.log(`${ui.name}: hide`);
    ui.setState({
      shown: false,
    });
    W.dispatchEvent(new Event(`{ui.name}.hide`));
  };

  next = () => {
    const ui = this;
    const el = ui.state.current;
    const gallery = el.getAttribute('data-gallery');

    let i = ui._currIndex();
    if (i < ui.state.collections[gallery].length - 1) {
      i++;
    } else {
      i = 0;
    }

    ui.state.collections[gallery][i].click();

    console.log(`${ui.name}: next`);
    W.dispatchEvent(new Event(`{ui.name}.next`));
  };

  prev = () => {
    const ui = this;
    const el = ui.state.current;
    const gallery = el.getAttribute('data-gallery');

    let i = ui._currIndex();
    if (i > 0) {
      i--;
    } else {
      i = ui.state.collections[gallery].length - 1;
    }

    ui.state.collections[gallery][i].click();

    console.log(`${ui.name}: prev`);
    W.dispatchEvent(new Event(`{ui.name}.prev`));
  };

  reset = () => {
    const ui = this;

    ui.setState({
      content: '',
      type: ['empty'],
      shown: false,
      loading: false,
      error: false,
      embed: false,
      //collections: [],
      //current: null,
      //target: null,
    });
  };

  load = (link) => {
    const ui = this;

    ui.reset();
    ui.setState({
      loading: true,
    });
    ui.show();

    fetch(link).then((resp) => {
      // handle success
      const type = resp.headers.get("content-type");
      console.log(resp);

      console.log(
        `${ui.name}: response content-type: ${type}`
      );
      const json = false;

      switch (type) {
        case 'image/jpeg':
        case 'image/png':
        case 'image/svg+xml':
        case 'image/bmp':
        case 'image/gif':
        case 'image/tiff':
        case 'image/webp':
          // irregular types:
        case 'image/jpg':
        case 'image/svg':
          //json = JSON.parse(ui._abToString(resp.data));
          resp.arrayBuffer().then((buffer) => {
            ui.setContent(
              `<img src="data:${type};base64,${ui._imageEncode(buffer)}" />`,
              `meta-${ui.name}--image`
            );
          });
          break;
        case 'application/json':
        case 'application/ld+json':
          // irregular types:
        case 'application/json; charset=UTF-8':
          ui.setContent(`${json['Content']}`, [
            `meta-${ui.name}--text`,
            `meta-${ui.name}--html`,
            `meta-${ui.name}--json`,
          ]);

          break;
        case 'video/mp4':
          ui.setContent(`<video controls autoplay><source src="${link}" type="video/mp4">Your browser does not support the video tag.</video>`, [
            `meta-${ui.name}--image`,
            `meta-${ui.name}--video`,
          ]);
          break;
        case 'text/html':
        case 'application/xhtml+xml':
        case 'text/plain':
          // irregular types:
        case 'text/html; charset=UTF-8':
        case 'application/xhtml+xml; charset=UTF-8':
        case 'text/plain; charset=UTF-8':
          ui.setContent(resp.data, [
            `meta-${ui.name}--text`,
            `meta-${ui.name}--html`,
            `meta-${ui.name}--pajax`,
          ]);
          break;
        default:
          console.warn(`${ui.name}: Unknown response content-type!`);
          break;
      }

      W.dispatchEvent(new Event(`{ui.name}.loaded`));
    })
      .catch((error) => {
        console.error(error);

        let msg = '';

        if (error.response) {
          switch (error.response.status) {
            case 404:
              msg = 'Not Found.';
              break;
            case 500:
              msg = 'Server issue, please try again latter.';
              break;
            default:
              msg = 'Something went wrong.';
              break;
          }
        } else if (error.request) {
          msg = 'No response received';
        } else {
          console.warn('Error', error.message);
        }

        ui.setState({
          error: msg,
        });

        W.dispatchEvent(new Event(`{ui.name}.error`));
      })
      .then(() => {
        ui.setState({
          loading: false,
        });

        setTimeout(() => {
          ui.state.current.classList.remove('loading');
        }, 1000);
      });
  };

  _currIndex = () => {
    const ui = this;
    const el = ui.state.current;
    const gallery = el.getAttribute('data-gallery');

    return ui.state.collections[gallery].indexOf(el);
  };

  embed = (link) => {
    const ui = this;
    console.log(`${ui.name}: embed`);

    ui.reset();
    ui.setState({
      embed: link,
      loading: false,
      type: [`meta-${ui.name}--embed`, `meta-${ui.name}--video`],
    });

    ui.show();
  };

  setCaption = (title) => {
    const ui = this;
    console.log(`${ui.name}: setCaption`);

    ui.state.caption = title;
  };

  addExtraClass = (cls) => {
    const ui = this;

    if (!cls || !cls.length) {
      return;
    }

    console.log(`${ui.name}: addExtraClass(${cls})`);
    ui.state.extraClass = cls;
  };

  getCaption = () => {
    const ui = this;
    return ui.state.caption;
  };

  /*_abToString = (arrayBuffer) => {
    return String.fromCharCode.apply(null, new Uint8Array(arrayBuffer));
  };*/

  _imageEncode = (buffer) => {
    let binary = '';
    const bytes = [].slice.call(new Uint8Array(buffer));
    bytes.forEach((b) => binary += String.fromCharCode(b));
    return window.btoa(binary);
  };

  setContent = (html, type) => {
    const ui = this;
    console.log(`${ui.name}: setContent`);

    let typeArr = type
      ? type
      : [`meta-${ui.name}--html`, `meta-${ui.name}--text`];
    if (!Array.isArray(typeArr)) {
      typeArr = type.split(' ');
    }

    ui.setState({
      content: html,
      type: typeArr,
    });
  };

  getHtml = () => {
    const ui = this;

    if (ui.state.embed) {
      const youtubeEmbed = require('youtube-embed');
      const embedLink = youtubeEmbed(ui.state.embed);
      ui.state.content = `<iframe width="600" height="380" src="${embedLink}" frameborder="0"></iframe>`;
    }

    return ui.state.content;
  };

  setState(state) {
    const ui = this;
    ui.state = Object.assign({}, ui.state, state);
    ui.render();
  }

  render() {
    const ui = this;
    const name = ui.name;

    const navs = null;
    const el = ui.state.current;

    ui.state.target.innerHTML = '';
    const meta = document.createElement('div');
    meta.classList.add(`meta-${name}`);
    meta.classList.add(...ui.state.type);
    ui.state.target.append(meta);

    const metaOverlay = document.createElement('div');
    metaOverlay.classList.add(`meta-${name}-overlay`);
    if (ui.state.shown) {
      metaOverlay.classList.add(`meta-${name}-overlay--open`);
    }

    if (ui.state.loading) {
      metaOverlay.classList.add(`meta-${name}-overlay--loading`);
    }

    if (ui.state.error) {
      metaOverlay.classList.add(`meta-${name}-overlay--error`);
    }

    meta.append(metaOverlay);

    const metaContent = document.createElement('div');
    metaContent.classList.add('meta-content');
    metaOverlay.append(metaContent);

    const btnClose = document.createElement('button');
    btnClose.classList.add('meta-nav', 'meta-close', 'a');
    btnClose.innerHTML =
      '<i class="icon fa fas fa-times"></i>' +
      ' <span class="visually-hidden">Close</span>';
    btnClose.addEventListener('click', (e) => {
      e.preventDefault();
      ui.hide();
    });
    metaContent.append(btnClose);

    if (el) {
      const gallery = el.getAttribute('data-gallery');
      if (gallery && ui.state.collections[gallery].length > 1) {
        const navs = document.createElement('nav');
        navs.classList.add('meta-navs');

        const prevBtn = document.createElement('button');
        prevBtn.classList.add(
          'meta-nav',
          'meta-nav-arrow',
          'meta-nav-arrow__prev',
          'a'
        );
        prevBtn.innerHTML =
          '<i class="icon fa fas fa-chevron-left"></i>' +
          ' <span class="visually-hidden">Previous</span>';
        prevBtn.addEventListener('click', (e) => {
          e.preventDefault();
          ui.prev();
        });
        navs.append(prevBtn);

        const nextBtn = document.createElement('button');
        nextBtn.classList.add(
          'meta-nav',
          'meta-nav-arrow',
          'meta-nav-arrow__next',
          'a'
        );
        nextBtn.innerHTML =
          '<i class="icon fa fas fa-chevron-right"></i>' +
          ' <span class="visually-hidden">Next</span>';
        nextBtn.addEventListener('click', (e) => {
          e.preventDefault();
          ui.next();
        });
        navs.append(nextBtn);

        metaContent.append(navs);
      }
    }

    const content = document.createElement('section');
    content.classList.add('meta-wrap', 'typography');
    if (ui.state.extraClass) {
      content.classList.add(ui.state.extraClass);
    }

    content.innerHTML = ui.getHtml();
    metaContent.append(content);

    if (ui.state.error) {
      const error = document.createElement('div');
      error.classList.add('meta-error');
      error.innerHTML = ui.state.error;
      metaContent.append(error);
    } else if (ui.state.caption) {
      const caption = document.createElement('div');
      caption.classList.add('meta-caption');
      caption.innerHTML = ui.getCaption();
      metaContent.append(caption);
    }

    // update fontawesome dome
    if (typeof window.FontAwesome !== 'undefined') {
      window.FontAwesome.dom.i2svg();
    }

    return ui;
  }
}

export default MetaWindow;