Class: Capwatch::Calculator

Inherits:
Object
  • Object
show all
Defined in:
lib/capwatch/calculator.rb

Class Method Summary collapse

Class Method Details

.fund_hash(fund, coinmarketcap_json) ⇒ Object 



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# File 'lib/capwatch/calculator.rb', line 3

def self.fund_hash(fund, coinmarketcap_json)
  table = []

  title = fund['name']
  symbols = fund['symbols']
  fund_keys = symbols.keys

  price_eth_btc = coinmarketcap_json.find do |x|
    x['symbol'] == 'ETH'
  end['price_usd'].to_f

  filtered_response_json = coinmarketcap_json.select do |x|
    fund_keys.include?(x['symbol'])
  end

  total_value_usd = filtered_response_json.inject(0) do |sum, n|
    sum + symbols[n['symbol']] * n['price_usd'].to_f
  end

  total_value_btc = filtered_response_json.inject(0) do |sum, n|
    sum + symbols[n['symbol']] * n['price_btc'].to_f
  end

  total_value_eth = filtered_response_json.inject(0) do |sum, n|
    sum + symbols[n['symbol']] * n['price_usd'].to_f / price_eth_btc
  end

  distribution_hash = {}

  fund_keys.each do |x|
    x = filtered_response_json.find { |e| e['symbol'] == x }
    symbol = x['symbol']
    asset_name = "#{x['name']} (#{symbol})"
    quant_value = symbols[symbol]
    price = x['price_usd'].to_f
    value_btc = quant_value * x['price_btc'].to_f
    value_eth = quant_value * x['price_usd'].to_f / price_eth_btc
    value_usd = quant_value * x['price_usd'].to_f
    distribution_float = value_usd / total_value_usd
    distribution_hash[symbol] = distribution_float
    distribution = distribution_float * 100
    percent_change_24h = x['percent_change_24h'].to_f || 0
    percent_change_7d = x['percent_change_7d'].to_f || 0
    table << [
      asset_name,
      price,
      quant_value,
      value_usd,
      value_btc,
      value_eth,
      distribution,
      percent_change_24h,
      percent_change_7d
    ]
  end

  a_24h = filtered_response_json.inject(0) do |sum, n|
    sum + n['percent_change_24h'].to_f * distribution_hash[n['symbol']].to_f
  end

  a_7d = filtered_response_json.inject(0) do |sum, n|
    sum + n['percent_change_7d'].to_f * distribution_hash[n['symbol']].to_f
  end

  footer = [
    '',
    '',
    '',
    total_value_usd,
    total_value_btc,
    total_value_eth,
    '',
    a_24h,
    a_7d
  ]

  table.sort_by! { |e| -e[3].to_f }
  table.each.with_index(1) { |e, i| e[0] = "#{i}. #{e[0]}" }

  {}
    .merge(title: title)
    .merge(table: table)
    .merge(footer: footer)
end