"use strict";



//  I M P O R T S

import got from "got";
import html from "choo/html";

//  U T I L S

import fetchMetadata from "@helper/fetch-metadata";
import { generateGitHubFeed } from "@helper/github";
import messageSlack from "@helper/slack";

let apiUrl = process.env.REWARD_URL;
let githubAppId = process.env.GITHUB_APP_ID;
let githubAppSecret = process.env.GITHUB_APP_SECRET;

if (process.env.NODE_ENV === "development") {
  apiUrl = process.env.REWARD_URL_TEST;
  githubAppId = process.env.GITHUB_APP_ID_TEST;
  githubAppSecret = process.env.GITHUB_APP_SECRET_TEST;
}



//  P R O G R A M

export default (socket, action) => {
  if (typeof socket !== "object" && typeof action !== "object")
    return;

  switch(true) {
    case action.message === "auth me with github":
      getGitHubUserToken(socket);
      break;

    case action.message === "verify github auth":
      syncWithApi(action, socket);
      break;

    case action.message === "fetch metadata":
      fetchMetadata(action, socket);
      break;

    case action.message === "landed on homepage":
      generateGitHubFeed(result => {
        send(socket, {
          html: result,
          message: "updated html",
          selector: "#github-feed"
        });
      });
      break;

    case action.message === "landed on playground":
      generateContent(1, result => {
        send(socket, {
          html: result,
          message: "updated html",
          selector: "#playground-loader"
        });
      });
      break;

    case action.message === "request for playground, example 1":
      generateContent(1, result => {
        send(socket, {
          html: result,
          message: "updated html",
          selector: "#playground-loader"
        });
      });
      break;

    case action.message === "request for playground, example 2":
      generateMemeCreator(socket);
      break;

    case action.message === "request for playground, example 3":
      generateContent(3, result => {
        send(socket, {
          html: result,
          message: "updated html",
          selector: "#playground-loader"
        });
      });
      break;

    case action.message === "subscribe":
      newsletterSubscribe(action, socket);
      break;

    default:
      break;
  }
};



//  H E L P E R S

function generateContent(exampleNumber, displayTrendingContent) {
  if (exampleNumber === 1) {
    return getTrendingContent().then(response => {
      if (!response || !response.success || response.success !== true || !response.data)
        return "";

      const rawContentCollection = [];
      const renderedContentCollection = [];
      const trendingContentData = response.data;

      for (const data of trendingContentData)
        rawContentCollection.push(fetchMetadata({
          claim: data.url,
          example: exampleNumber,
          method: "resolve"
        }));

      Promise.all(rawContentCollection).then(collection => {
        for (const part of collection) {
          try {
            renderedContentCollection.push(`
              <section class="playground-content__trend">
                <figure
                  class="media__thumb"
                  data-action="choose claim"
                  data-claim-id="${part.name}"
                  style="background-image: url(${makeImageSourceSecure(part.value.stream.metadata.thumbnail)})">
                </figure>

                <div class="media__title">
                  ${part.value.stream.metadata.title}
                </div>

                <div class="media__subtitle">
                  ${part.channel_name}
                </div>
              </section>
            `);
          } catch(err) {
            return; // TODO: Return nice error message
          }
        }

        renderedContentCollection.push(`
          <script>
            document.getElementById("playground-example-description").innerHTML = document.querySelector("[data-action='playground, example 1']").dataset.description
          </script>
        `);

        displayTrendingContent(renderedContentCollection.join(""));
      });
    });
  }

  if (exampleNumber === 3) {
    const approvedUrls = [
      "LBRY#3db81c073f82fd1bb670c65f526faea3b8546720",
      "correlation-can-imply-causation#173412f5b1b7aa63a752e8832406aafd9f1ecb4e",
      "thanos-is-the-protagonist-how-infinity#2a7f5db2678177435b1dee6c9e38e035ead450b6",
      "epic-arcade-mode-duos-nickatnyte-molt#d81bac6d49b1f92e58c37a5f633a27a45b43405e",
      "political-correctness-a-force-for-good-a#b4668c0bd096317b44c40738c099b6618095e75f",
      "10-secrets-hidden-inside-famous-logos#007789cc45cbb4255cf02ba77cbf84ca8e3d7561",
      "ever-wonder-how-bitcoin-and-other#1ac47b8b3def40a25850dc726a09ce23d09e7009",
      "bankrupt-pan-am#784b3c215a6f06b663fc1aa292bcb19f29c489bb",
      "minecraft-in-real-life-iron-man#758dd6497cdfc401ae1f25984738d024d47b50af",
      "ethan-shows-kyle-warframe-skyvault#8a7401b88d5ed0376d98f16808194d4dcb05b284"
    ];

    const rawContentCollection = [];
    const renderedContentCollection = [];

    for (const url of approvedUrls)
      rawContentCollection.push(fetchMetadata({ claim: url, method: "resolve", example: exampleNumber }));

    return Promise.all(rawContentCollection).then(collection => {
      for (const part of collection) {
        if (
          part &&
          part.value &&
          part.value.stream.metadata.thumbnail &&
          part.channel_name
        ) {
          renderedContentCollection.push(`
            <section class="playground-content__trend">
              <figure
                class="media__thumb"
                data-action="choose claim"
                data-claim-id="${part.claim_id}"
                data-name=${part.name}
                style="background-image: url(${makeImageSourceSecure(part.value.stream.metadata.thumbnail)})">
              </figure>

              <div class="media__title">
                ${part.value.stream.metadata.title}
              </div>

              <div class="media__subtitle">
                ${part.channel_name}
              </div>
            </section>
          `);
        }
      }

      renderedContentCollection.push(`
        <script>
          document.getElementById("playground-example-description").innerHTML = document.querySelector("[data-action='playground, example 3']").dataset.description
        </script>
      `);

      displayTrendingContent(renderedContentCollection.join(""));
    });
  }
}

function generateMemeCreator(socket) {
  const images = [
    {
      alt: "Carl Sagan",
      // src: "https://spee.ch/4f6b953e605a602434246743fd246d3e1fd4f5fd/carlsagan2.jpg"
      src: "/assets/media/images/carlsagan2.jpg"
    },
    {
      alt: "Doge",
      // src: "https://spee.ch/2f90f2d91441a4d33d3d4eb82bdfc4c56ec742c7/doge-meme.jpg"
      src: "/assets/media/images/doge-meme.jpg"
    },
    {
      alt: "LBRY Logo With Green Background",
      // src: "https://spee.ch/40ac6818bbac87a208722bf4467653341d460908/lbry-green.png"
      src: "/assets/media/images/lbry-green.png"
    }
  ];

  const memePlaceholderData = {
    bottomLine: {
      placeholder: "Top line",
      value: "that I made"
    },
    description: {
      placeholder: "Description",
      value: "Check out this image I published to LBRY via lbry.tech"
    },
    topLine: {
      placeholder: "Top line",
      value: "This is an example meme"
    },
    title: {
      placeholder: "Title",
      value: "Dank Meme Supreme da Cheese"
    }
  };

  const renderedImages = [];

  for (const image of images)
    renderedImages.push(`<img alt="${image.alt}" class="playground-content__meme__canvas__thumbnail" src="${image.src}"/>`);

  const memeCreator = html`
    <div class="playground-content__meme__canvas">
      <img alt="Base image for LBRY meme creator" id="base-image" style="height: 0; position: absolute; visibility: hidden;"/>
      <canvas id="meme-canvas" height="600" width="800">Unfortunately, it looks like canvas is <strong>not supported</strong> in your browser</canvas>

      ${renderedImages}
    </div>

    <form class="playground-content__meme__editor">
      <fieldset>
        <legend>Image Text</legend>

        <fieldset-section>
          <label for="meme-top-line">Top line</label>
          <input id="meme-top-line" name="meme-top-line" placeholder="${memePlaceholderData.topLine.placeholder}" spellcheck="false" type="text" value="${memePlaceholderData.topLine.value}" required/>
        </fieldset-section>

        <fieldset-section>
          <label for="meme-bottom-line">Bottom line</label>
          <input id="meme-bottom-line" name="meme-bottom-line" placeholder="${memePlaceholderData.bottomLine.placeholder}" spellcheck="false" type="text" value="${memePlaceholderData.bottomLine.value}" required/>
        </fieldset-section>
      </fieldset>

      <fieldset>
        <legend>Metadata</legend>

        <fieldset-section>
          <label for="meme-title">Title</label>
          <input id="meme-title" name="meme-title" placeholder="${memePlaceholderData.title.placeholder}" spellcheck="false" type="text" value="${memePlaceholderData.title.value}" required/>
        </fieldset-section>

        <fieldset-section>
          <label for="meme-description">Description</label>
          <textarea id="meme-description" name="meme-description" placeholder="${memePlaceholderData.description.placeholder}" spellcheck="false" type="text" required>${memePlaceholderData.description.value}</textarea>
        </fieldset-section>

        <fieldset-section>
          <label for="meme-language">Language</label>
          <select id="meme-language" name="meme-language">
            <option value="ar">Arabic</option>
            <option value="zh">Chinese (Mandarin)</option>
            <option value="en">English</option>
            <option value="fr">French</option>
            <option value="de">German</option>
            <option value="it">Italian</option>
            <option value="jp">Japanese</option>
            <option value="ru">Russian</option>
            <option value="es">Spanish</option>
            <option value="">Not specified</option>
          </select>
        </fieldset-section>

        <fieldset-section>
          <label for="meme-license">License</label>
          <select id="meme-license" name="meme-license" required>
            <option value="Public Domain">Public Domain</option>
            <option value="Creative Commons Attribution 4.0 International">Creative Commons Attribution 4.0 International</option>
            <option value="Creative Commons Attribution-ShareAlike 4.0 International">Creative Commons Attribution-ShareAlike 4.0 International</option>
            <option value="Creative Commons Attribution-NoDerivatives 4.0 International">Creative Commons Attribution-NoDerivatives 4.0 International</option>
            <option value="Creative Commons Attribution-NonCommercial 4.0 International">Creative Commons Attribution-NonCommercial 4.0 International</option>
            <option value="Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International</option>
            <option value="Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International">Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International</option>
            <option value="None">None</option>
          </select>
        </fieldset-section>

        <fieldset-section>
          <checkbox-element>
            <input id="meme-nsfw-flag" name="nsfw" type="checkbox">
            <label for="meme-nsfw-flag">NSFW</label>
            <checkbox-toggle/>
          </checkbox-element>

          <button data-action="upload image" class="button" type="button">Submit</button>
        </fieldset-section>
      </fieldset>
    </form>
  `;

  return send(socket, {
    example: 2,
    html: memeCreator,
    message: "updated html",
    selector: "#playground-loader"
  });
}

function getGitHubUserToken(socket) {
  send(socket, {
    message: "redirect",
    url: `https://github.com/login/oauth/authorize?client_id=${githubAppId}&scope=public_repo,user:email`
  });
}

async function getTrendingContent() {
  try {
    const response = await got("https://api.lbry.io/file/list_trending");
    return JSON.parse(response.body); // eslint-disable-line padding-line-between-statements
  } catch(error) {
    return error;
  }
}

function makeImageSourceSecure(url) {
  const originalUrl = new URL(url);

  if (originalUrl.protocol !== "https")
    return `https://${originalUrl.host}${originalUrl.pathname}`;

  return originalUrl.href;
}

async function newsletterSubscribe(data, socket) {
  const email = data.email;

  if (!validateEmail(email)) {
    send(socket, {
      class: "error",
      html: "Your email address is invalid",
      message: "updated html",
      selector: "#emailMessage"
    });
  }

  try {
    await got.post(`https://api.lbry.io/list/subscribe?email=${encodeURIComponent(email)}&tag=developer`);

    return send(socket, {
      html: "Thank you! Please confirm subscription in your inbox.",
      message: "updated html",
      selector: "#emailMessage"
    });
  } catch(error) {
    const response = JSON.parse(error.body);

    if (!response.success) {
      messageSlack(
        "\n" +
        "> *NEWSLETTER ERROR:* ```" + response.error + "```" + "\n" +
        `> _Cause: ${email} interacted with the form_\n`
      );

      return send(socket, {
        class: "error",
        html: response.error,
        message: "updated html",
        selector: "#emailMessage"
      });
    }

    messageSlack(
      "\n" +
      "> *NEWSLETTER ERROR:* ```¯\\_(ツ)_/¯ This should be an unreachable error```" + "\n" +
      `> _Cause: ${email} interacted with the form_\n`
    );

    return send(socket, {
      class: "error",
      html: "Something is terribly wrong",
      message: "updated html",
      selector: "#emailMessage"
    });
  }
}

export function send(transport, data) {
  return transport.send(JSON.stringify(data));
}

async function syncWithApi(data, socket) {
  const tokenResponse = await verifyGitHubToken(data.code);

  if (tokenResponse === null) {
    return send(socket, {
      html: "<p><strong>There was an issue with accessing GitHub's API. Please try again later.</strong></p>",
      message: "updated html",
      selector: "developer-program"
    });
  }

  try {
    let result = await got(`https://${apiUrl}/reward/new?github_token=${tokenResponse}&reward_type=github_developer&wallet_address=${data.address}`, { json: true });

    result = result.body.data;

    return send(socket, {
      html: `<p><strong>Success!</strong> Your wallet has been credited with ${result.reward_amount} LBC.</p><p>We have a great reference for the <a href="/api/sdk">LBRY SDK here</a> to help you get started.</p>`,
      message: "updated html",
      selector: "developer-program"
    });
  } catch(error) {
    if (!error.body) {
      return send(socket, {
        html: "<p><strong>LBRY API is down. Please try again later.</strong></p>",
        message: "updated html",
        selector: "developer-program"
      });
    }

    console.log(error.body); // eslint-disable-line no-console

    return send(socket, {
      html: "<p>This reward is limited to <strong>ONE</strong> per person. Your enthusiasm is appreciated.</p>",
      message: "updated html",
      selector: "developer-program"
    });
  }
}

function validateEmail(email) {
  const emailRegex = /^(([^<>()[\].,;:\s@"]+(\.[^<>()[\].,;:\s@"]+)*)|(".+"))@(([^<>()[\].,;:\s@"]+\.)+[^<>()[\\.,;:\s@"]{2,})$/i;
  return emailRegex.test(String(email)); // eslint-disable-line padding-line-between-statements
}

async function verifyGitHubToken(code) {
  try {
    let result = await got.post(`https://github.com/login/oauth/access_token?client_id=${githubAppId}&client_secret=${githubAppSecret}&code=${code}`, { json: true });

    result = result.body;
    return result.access_token;
  } catch(verificationError) {
    console.log(verificationError.body); // eslint-disable-line no-console
    return null;
  }
}