'use strict';

const bitcoin = require('bitcoin');
let config = require('config');
let lbrycrdConfig = config.get('lbrycrd');
let sandboxChannel = config.get('sandboxchannel');
const lbry = new bitcoin.Client(lbrycrdConfig);

exports.commands = ['tip'];
exports.tip = {
  usage: '<subcommand>',
  description: `balance: get your balance
    deposit: get address for your deposits
    withdraw ADDRESS AMOUNT: withdraw AMOUNT credits to ADDRESS
    [private] <user> <amount>: mention a user with @ and then the amount to tip them, or put private before the user to tip them privately.
 Key: [] : Optionally include contained keyword, <> : Replace with appropriate value.`,
  process: async function(bot, msg, suffix) {
    let tipper = msg.author.id.replace('!', ''),
      words = msg.content
        .trim()
        .split(' ')
        .filter(function(n) {
          return n !== '';
        }),
      subcommand = words.length >= 2 ? words[1] : 'help';
    switch (subcommand) {
      case 'help':
        doHelp(msg);
        break;
      case 'balance':
        doBalance(msg, tipper);
        break;
      case 'deposit':
        doDeposit(msg, tipper);
        break;
      case 'withdraw':
        doWithdraw(msg, tipper, words);
        break;
      default:
        doTip(msg, tipper, words);
    }
  }
};

function doBalance(message, tipper) {
  lbry.getBalance(tipper, 1, function(err, balance) {
    if (err) {
      message.reply('Error getting balance');
    } else {
      message.reply(`You have *${balance}* LBC`);
    }
  });
}

function doDeposit(message, tipper) {
  if (!inPrivateOrBotSandbox(message)) {
    return message.reply(`Please use <#${sandboxChannel}> or DMs to talk to bots.`);
  }
  getAddress(tipper, function(err, address) {
    if (err) {
      message.reply('Error getting deposit address');
    } else {
      message.reply(`Your address is ${address}`);
    }
  });
}

function doWithdraw(message, tipper, words) {
  if (!inPrivateOrBotSandbox(message)) {
    return message.reply(`Please use <#${sandboxChannel}> or DMs to talk to bots.`);
  }
  if (words.length < 4) {
    return doHelp(message);
  }

  let address = words[2],
    amount = getValidatedAmount(words[3]);

  if (amount === null) {
    message.reply("I don't know how to withdraw that many credits");
    return;
  }

  lbry.sendFrom(tipper, address, amount, function(err, txId) {
    if (err) {
      return message.reply(err.message);
    }
    message.reply(`You withdrew ${amount} to ${address} (${txLink(txId)})`);
  });
}

function doTip(message, tipper, words) {
  if (words.length < 3 || !words) {
    return doHelp(message);
  }

  let prv = 0;
  let amountOffset = 2;
  if (words.length >= 4 && words[1] === 'private') {
    prv = 1;
    amountOffset = 3;
  }

  let amount = getValidatedAmount(words[amountOffset]);

  if (amount === null) {
    return message.reply("I don't know how to tip that many credits");
  }

  if (message.mentions.users.first().id) {
    return sendLbc(message, tipper, message.mentions.users.first().id.replace('!', ''), amount, prv);
  }
  message.reply('Sorry, I could not find a user in your tip...');
}

function doHelp(message) {
  if (!inPrivateOrBotSandbox(message)) {
    message.reply(`Sent you help via DM! Please use <#${sandboxChannel}> or DMs to talk to bots.`);
  }
  message.author.send(`**!tip**
    balance: get your balance
    deposit: get address for your deposits
    withdraw ADDRESS AMOUNT: withdraw AMOUNT credits to ADDRESS
    [private] <user> <amount>: mention a user with @ and then the amount to tip them, or put private before the user to tip them privately.
    Key: [] : Optionally include contained keyword, <> : Replace with appropriate value.`);
}

function sendLbc(message, tipper, recipient, amount, privacyFlag) {
  getAddress(recipient, function(err, address) {
    if (err) {
      message.reply(err.message);
    } else {
      lbry.sendFrom(tipper, address, amount, 1, null, null, function(err, txId) {
        if (err) {
          message.reply(err.message);
        } else {
          let imessage = `Wubba lubba dub dub! <@${tipper}> tipped <@${recipient}> ${amount} LBC (${txLink(txId)}). DM me \`!tip\` for tipbot instructions.`;
          if (privacyFlag) {
            message.author.send(imessage);
            if (message.author.id !== message.mentions.users.first().id) {
              message.mentions.users.first().send(imessage);
            }
          } else {
            message.reply(imessage);
          }
        }
      });
    }
  });
}

function getAddress(userId, cb) {
  lbry.getAddressesByAccount(userId, function(err, addresses) {
    if (err) {
      cb(err);
    } else if (addresses.length > 0) {
      cb(null, addresses[0]);
    } else {
      lbry.getNewAddress(userId, function(err, address) {
        if (err) {
          cb(err);
        } else {
          cb(null, address);
        }
      });
    }
  });
}

function inPrivateOrBotSandbox(msg) {
  return msg.channel.type === 'dm' || msg.channel.id === sandboxChannel;
}

function getValidatedAmount(amount) {
  amount = amount.trim();
  if (amount.toLowerCase().endsWith('lbc')) {
    amount = amount.substring(0, amount.length - 3);
  }
  return amount.match(/^[0-9]+(\.[0-9]+)?$/) ? amount : null;
}

function txLink(txId) {
  return '<https://explorer.lbry.io/tx/' + txId + '>';
}