# frozen_string_literal: true

RSpec.describe StrikeMe::BTC do
  context 'create from integer' do
    it 'creates using #btc' do
      btc = 314.btc

      expect(btc).to be_a described_class
      expect(btc.sats).to eq 314 * 100_000_000
    end

    it 'creates using #sats' do
      btc = 314.sats

      expect(btc).to be_a described_class
      expect(btc.sats).to eq 314
    end
  end

  context 'create from float' do
    it 'creates using #btc' do
      btc = 314.85.btc

      expect(btc).to be_a described_class
      expect(btc.sats).to eq 31_485_000_000
    end

    it 'creates using #sats' do
      btc = 314.85.sats

      expect(btc).to be_a described_class
      expect(btc.sats).to eq 315
    end
  end

  it 'properly formats to string' do
    expect(described_class.new(234_522).to_s).to eq '0.00234522'
  end

  it 'formats properly in json structures' do
    btc = described_class.new(234_522)
    expect({ amount: btc }.to_json).to eq '{"amount":"0.00234522"}'
  end

  context 'arithmetic' do
    it 'supports multiplication with numbers' do
      btc1 = described_class.new 234_529
      btc2 = btc1 * 3
      btc3 = btc2 * 2.9

      expect(btc2).to be_a described_class
      expect(btc3).to be_a described_class

      expect(btc2).not_to eq btc1
      expect(btc2).not_to eq btc3

      expect(btc1.sats).to eq   234_529
      expect(btc1).to      eq   234_529
      expect(btc2).to      eq   703_587
      expect(btc3).to      eq 2_040_402
    end

    it 'supports division with numbers' do
      btc1 = described_class.new 34_529
      btc2 = btc1 / 3
      btc3 = btc2 / 2.9

      expect(btc2).to be_a described_class
      expect(btc3).to be_a described_class

      expect(btc2).not_to eq btc1
      expect(btc2).not_to eq btc3

      expect(btc1.sats).to eq 34_529
      expect(btc1).to eq      34_529
      expect(btc2).to eq      11_509
      expect(btc3).to eq       3_968
    end

    it 'supports addition with other BTC objects' do
      btc1 = described_class.new(34_529)
      btc2 = described_class.new(2_556)
      btc3 = btc1 + btc2

      expect { btc1 + 23 }.to raise_error StrikeMe::BTC::Error

      expect(btc3).to be_a described_class
      expect(btc3).to eq 37_085
    end

    it 'supports subtraction with other BTC objects' do
      btc1 = described_class.new 34_529
      btc2 = described_class.new  2_556
      btc3 = btc1 - btc2

      expect { btc1 - 23 }.to raise_error StrikeMe::BTC::Error

      expect(btc3).to be_a described_class
      expect(btc3).to eq 31_973
    end
  end

  it 'is consistent for small values' do
    # if floor is used instead of round, the small number 3, multiplied by 100 million can result in 2.99999999 leading to 2
    string = 3.sats.to_s
    expect(string).to eq '0.00000003'
    expect(string.to_f.btc.sats).to eq 3
  end
end