'use strict';

let lbry;
let mongo;
let discordBot;
let moment = require('moment');
let request = require('request');
let sleep = require('sleep');
let config = require('config');
let channels = config.get('claimbot').channels;
const Discord = require('discord.js');
const rp = require('request-promise');
const jsonfile = require('jsonfile');
const path = require('path');
const fs = require('fs');
const appRoot = require('app-root-path');
const fileExists = require('file-exists');
module.exports = {
  init: init
};

function init(discordBot_) {
  if (lbry) {
    throw new Error('init was already called once');
  }

  discordBot = discordBot_;

  const MongoClient = require('mongodb').MongoClient;
  MongoClient.connect(config.get('mongodb').url, function(err, db) {
    if (err) {
      throw err;
    }
    mongo = db;

    console.log('Activating claimbot ');
    discordBot.channels.get(channels[0]).send('activating claimbot');

    // Check that our syncState file exist.
    fileExists(path.join(appRoot.path, 'syncState.json'), (err, exists) => {
      if (err) {
        throw err;
      }
      if (!exists) {
        fs.writeFileSync(path.join(appRoot.path, 'syncState.json'), '{}');
      }
    });
    setInterval(function() {
      announceClaims();
    }, 60 * 1000);
    announceClaims();
  });
}

async function announceClaims() {
  // get last block form the explorer API.
  let lastBlockHeight = JSON.parse(await rp('https://explorer.lbry.io/api/v1/status')).status.height;
  // get the latest claims from chainquery since last sync
  let syncState = await getJSON(path.join(appRoot.path, 'syncState.json')); // get our persisted state
  if (!syncState.LastSyncTime) {
    syncState.LastSyncTime = new Date()
      .toISOString()
      .slice(0, 19)
      .replace('T', ' ');
  }
  let claimsSince = JSON.parse(await getClaimsSince(syncState.LastSyncTime)).data;
  // filter out the claims that we should add to discord
  let claims = [];
  for (let claim of claimsSince) {
    claim.value = JSON.parse(claim.value);
    if (claim.value.Claim && claim.value.Claim.stream) {
      claim.metadata = claim.value.Claim.stream.metadata;
    } else {
      claim.metadata = null;
    }
    if (claim.bid_state !== 'Spent' || claim.bid_state !== 'Expired') {
      claims.push(claim);
    }
  }
  for (let claim of claims) {
    console.log(claim);
  }
  // send each claim to discord.
  for (let claim of claims) {
    console.log(claim);
    if (claim.metadata) {
      // If its a claim, make a claimEmbed
      let claimEmbed = new Discord.RichEmbed()
        .setAuthor(
          claim.channel ? `New claim from ${claim.channel}` : 'New claim from Anonymous',
          'http://barkpost-assets.s3.amazonaws.com/wp-content/uploads/2013/11/3dDoge.gif',
          `http://open.lbry.io/${claim.channel ? `${claim.channel}#${claim.channelId}/${claim['name']}` : `${claim['name']}#${claim['claimId']}`}`
        )
        .setTitle('lbry://' + (claim.channel ? `${claim.channel}/` : '') + claim['name'])
        .setURL(`http://open.lbry.io/${claim.channel ? `${claim.channel}#${claim.channelId}/${claim['name']}` : `${claim['name']}#${claim['claimId']}`}`)
        .setColor(1399626)
        .setFooter(`Block ${claim.height} • Claim ID ${claim.claimId} • Data from Chainquery`);
      if (claim.metadata['title']) claimEmbed.addField('Title', claim.metadata['title']);
      if (claim.channel) claimEmbed.addField('Channel', claim.channel);
      if (claim.metadata['description']) {
        claimEmbed.addField('Description', claim.metadata['description'].substring(0, 1020));
      }
      if (claim.metadata['fee']) claimEmbed.addField('Fee', claim.metadata['fee'].amount + ' ' + claim.metadata['fee'].currency);
      if (claim.metadata['license'] && claim.metadata['license'].length > 2) claimEmbed.addField('License', claim.metadata['license']);
      if (!claim.metadata['nsfw'] && claim.metadata['thumbnail']) claimEmbed.setImage(claim.metadata['thumbnail']);
      if (claim.bid_state !== 'Controlling' && claim.height < claim.valid_at_height) {
        // Claim have not taken over the old claim, send approx time to event.
        let takeoverTime = Date.now() + (claim.valid_at_height - lastBlockHeight) * 161 * 1000; // in theory this should be 150, but in practice its closer to 161
        claimEmbed.addField('Takes effect on approx', moment(takeoverTime, 'x').format('MMMM Do [at] HH:mm [UTC]') + ` • at block height ${claim.valid_at_height}`);
      }
      claimEmbed.addField('Claimed for', `${Number.parseFloat(claim.outputValue)} LBC`);
      discordPost(claimEmbed);
    } else if (claim.name.charAt(0) === '@') {
      // This is a channel claim
      let channelEmbed = new Discord.RichEmbed()
        .setAuthor('New channel claim', 'http://barkpost-assets.s3.amazonaws.com/wp-content/uploads/2013/11/3dDoge.gif', `http://open.lbry.io/${claim['name']}#${claim['claimId']}`)
        .setTitle('lbry://' + (claim.channel ? claim.channel + '/' : '') + claim['name'])
        .setURL(`http://open.lbry.io/${claim['name']}#${claim['claimId']}`)
        .setColor(1399626)
        .setFooter(`Block ${claim.height} • Claim ID ${claim.claimId} • Data from Chainquery`)
        .addField('Channel Name', claim['name']);
      discordPost(channelEmbed);
    }
  }
  // set the last sync time to the db.
  syncState.LastSyncTime = new Date()
    .toISOString()
    .slice(0, 19)
    .replace('T', ' ');
  await saveJSON(path.join(appRoot.path, 'syncState.json'), syncState);
}

function getJSON(path) {
  return new Promise((resolve, reject) => {
    jsonfile.readFile(path, function(err, jsoncontent) {
      if (err) {
        reject(err);
      } else {
        resolve(jsoncontent);
      }
    });
  });
}
function saveJSON(path, obj) {
  return new Promise((resolve, reject) => {
    jsonfile.writeFile(path, obj, function(err, jsoncontent) {
      if (err) {
        reject(err);
      } else {
        resolve();
      }
    });
  });
}

function discordPost(embed) {
  channels.forEach(channel => {
    discordBot.channels
      .get(channel)
      .send('', embed)
      .catch(console.error);
  });
}

function getClaimsSince(time) {
  return new Promise((resolve, reject) => {
    let query =
      `` +
      `SELECT ` +
      `c.name,` +
      `c.valid_at_height,` +
      `c.height,` +
      `p.name as channel,` +
      `c.publisher_id as channelId,` +
      `c.bid_state,` +
      `c.effective_amount,` +
      `c.claim_id as claimId,` +
      `c.value_as_json as value, ` +
      `c.transaction_hash_id, ` + // txhash and vout needed to leverage old format for comparison.
      `c.vout, ` +
      `o.value as outputValue ` +
      `FROM claim c ` +
      `LEFT JOIN claim p on p.claim_id = c.publisher_id ` +
      `LEFT JOIN output o on (o.transaction_hash=c.transaction_hash_id and o.vout=c.vout) ` +
      `WHERE c.created_at >='` +
      time +
      `'`;
    // Outputs full query to console for copy/paste into chainquery (debugging)
    // console.log(query);
    rp(`https://chainquery.lbry.io/api/sql?query=` + query)
      .then(function(htmlString) {
        resolve(htmlString);
      })
      .catch(function(err) {
        console.log('error', '[Importer] Error getting updated claims. ' + err);
        reject(err);
      });
  });
}