import assert from 'assert'
import BigNumber from 'decimal.js'
import { format, toExponential, toFixed } from '../../../../src/utils/bignumber/formatter.js'

describe('format', function () {
  describe('format', function () {
    let B = null

    before(function () {
      B = BigNumber.clone({ precision: 20 }) // ensure the precision is 20 digits
    })

    it('should format special values Infinity, NaN', function () {
      assert.strictEqual(format(new BigNumber(Infinity)), 'Infinity')
      assert.strictEqual(format(new BigNumber(-Infinity)), '-Infinity')
      assert.strictEqual(format(new BigNumber(NaN)), 'NaN')
    })

    it('auto notation', function () {
      assert.strictEqual(format(new B(2).dividedBy(7)), '0.28571428571428571429')
      assert.strictEqual(format(new B(0.10400)), '0.104')
      assert.strictEqual(format(new B(1000)), '1000')

      assert.strictEqual(format(new B(1)), '1')
      assert.strictEqual(format(new B(0)), '0')
      assert.strictEqual(format(new B(-1)), '-1')

      assert.strictEqual(format(new B(2.4e-7)), '2.4e-7')
      assert.strictEqual(format(new B(2.4e-6)), '2.4e-6')
      assert.strictEqual(format(new B(2.4e-5)), '2.4e-5')
      assert.strictEqual(format(new B(2.4e-4)), '2.4e-4')
      assert.strictEqual(format(new B(2.3e-3)), '0.0023')
      assert.strictEqual(format(new B(2.3456e-3)), '0.0023456')
      assert.strictEqual(format(new B(2.3e-2)), '0.023')
      assert.strictEqual(format(new B(2.3e-1)), '0.23')
      assert.strictEqual(format(new B(2.3)), '2.3')
      assert.strictEqual(format(new B(2.3e+1)), '23')
      assert.strictEqual(format(new B(2.3e+2)), '230')
      assert.strictEqual(format(new B(2.3e+3)), '2300')
      assert.strictEqual(format(new B(2.3e+4)), '23000')
      assert.strictEqual(format(new B(2.3e+5)), '2.3e+5')
      assert.strictEqual(format(new B(2.3e+6)), '2.3e+6')

      assert.strictEqual(format(new B(1.000000012)), '1.000000012')
      assert.strictEqual(format(new B(1000000012)), '1.000000012e+9')

      assert.strictEqual(format(new B(1234567)), '1.234567e+6')
      assert.strictEqual(format(new B(123456789123456)), '1.23456789123456e+14')
      assert.strictEqual(format(new B(123456789123456e-14)), '1.23456789123456')
      assert.strictEqual(format(new B('123456789123456789')), '1.23456789123456789e+17')
      assert.strictEqual(format(new B('123456789123456789123456789')), '1.23456789123456789123456789e+26')

      assert.strictEqual(format(new B(0.1111e+6)), '1.111e+5')
      assert.strictEqual(format(new B(0.3333e+6)), '3.333e+5')
      assert.strictEqual(format(new B(0.6666e+6)), '6.666e+5')
      assert.strictEqual(format(new B(0.9999e+6)), '9.999e+5')
      assert.strictEqual(format(new B(1.111e+6)), '1.111e+6')
    })

    it('auto notation with very high precision', function () {
      const precision = 2000
      const B = BigNumber.clone({ precision: 2000 })

      const a = new B(1).dividedBy(3)

      const aStr = '0.' + Array(precision + 1).join('3')
      assert.strictEqual(format(a), aStr)
    })

    it('auto notation with precision as second parameter', function () {
      assert.deepStrictEqual(format(new B('1.23456'), 3), '1.23')
      assert.deepStrictEqual(format(new B('12345678'), 4), '1.235e+7')

      assert.strictEqual(format(new B(1).dividedBy(3)), '0.33333333333333333333')
      assert.strictEqual(format(new B(1).dividedBy(3), 5), '0.33333')
      assert.strictEqual(format(new B(1).dividedBy(3), 3), '0.333')
      assert.strictEqual(format(new B(2).dividedBy(3), 3), '0.667')
    })

    describe('should apply options', function () {
      it('auto notation with precision', function () {
        assert.strictEqual(format(new B(1).div(3)), '0.33333333333333333333')
        assert.strictEqual(format(new B(1).div(3), { precision: 3 }), '0.333')
        assert.strictEqual(format(new B(1).div(3), { precision: 4 }), '0.3333')
        assert.strictEqual(format(new B(1).div(3), { precision: 5 }), '0.33333')

        assert.strictEqual(format(new B(1000.000), { precision: 5 }), '1000')
        assert.strictEqual(format(new B(1000.0010), { precision: 5 }), '1000') // rounded off at 5 digits
        assert.strictEqual(format(new B(1234), { precision: 3 }), '1230')
        assert.strictEqual(format(new B(123.4), { precision: 6 }), '123.4')
        assert.strictEqual(format(new B(0.001234), { precision: 3 }), '0.00123')

        assert.strictEqual(format(new B(1234567), { precision: 4 }), '1.235e+6')
        assert.strictEqual(format(new B(1234567), { precision: 2 }), '1.2e+6')
        assert.strictEqual(format(new B(123e-6), { precision: 2 }), '1.2e-4')
        assert.strictEqual(format(new B(123e-6), { precision: 8 }), '1.23e-4') // should remove trailing zeros
        assert.strictEqual(format(new B(3e+6), { precision: 8 }), '3e+6') // should remove trailing zeros
        assert.strictEqual(format(new B(1234), { precision: 2 }), '1200')

        // overflow the maximum precision of 20
        assert.strictEqual(format(new B(2.3), { precision: 30 }), '2.3')
      })

      it('auto notation with custom lower and upper bound', function () {
        const options = {
          lowerExp: -6,
          upperExp: 9
        }
        assert.strictEqual(format(new B(0), options), '0')
        assert.strictEqual(format(new B(1234567), options), '1234567')
        assert.strictEqual(format(new B(1e+9), options), '1e+9')
        assert.strictEqual(format(new B(1e+9 - 1), options), '999999999')
        assert.strictEqual(format(new B(1e-6), options), '0.000001')
        assert.strictEqual(format(new B(0.999e-6), options), '9.99e-7')
        assert.strictEqual(format(new B(123456789123), options), '1.23456789123e+11')
      })

      it('auto notation with custom lower and upper bound (2)', function () {
        assert.strictEqual(format(new B(1), { lowerExp: -2 }), '1')
        assert.strictEqual(format(new B(0.1), { lowerExp: -2 }), '0.1')
        assert.strictEqual(format(new B(0.01), { lowerExp: -2 }), '0.01')
        assert.strictEqual(format(new B(0.001), { lowerExp: -2 }), '1e-3')

        assert.strictEqual(format(new B(0.009), { lowerExp: -2, precision: 1 }), '9e-3')
        assert.strictEqual(format(new B(0.0096), { lowerExp: -2, precision: 1 }), '0.01')
        assert.strictEqual(format(new B(0.01), { lowerExp: -2, precision: 1 }), '0.01')
        assert.strictEqual(format(new B(0.001), { lowerExp: -2, precision: 1 }), '1e-3')
      })
    })

    it('should format bignumbers with a custom formatting function', function () {
      function asCurrency (value) {
        return '$' + value.toFixed(2)
      }

      assert.strictEqual(format(new BigNumber(12.4264), asCurrency), '$12.43')
      assert.strictEqual(format(new BigNumber(0.1), asCurrency), '$0.10')
      assert.strictEqual(format(new BigNumber(1.2e+6), asCurrency), '$1200000.00')
    })

    it('should format bignumbers in exponential notation', function () {
      const options = {
        notation: 'exponential'
      }
      assert.deepStrictEqual(format(new B('1.23456'), options), '1.23456e+0')
      assert.deepStrictEqual(format(new B('12345678'), options), '1.2345678e+7')
      assert.deepStrictEqual(format(new B('2.3e+30'), options), '2.3e+30')
      assert.deepStrictEqual(format(new B('0.23e+30'), options), '2.3e+29')
      assert.deepStrictEqual(format(new B('2.3e-30'), options), '2.3e-30')
      assert.deepStrictEqual(format(new B('0.23e-30'), options), '2.3e-31')
    })

    it('should format bignumbers in exponential notation with precision', function () {
      const options = {
        notation: 'exponential',
        precision: 18
      }
      assert.deepStrictEqual(format(new B(1).div(3), options), '3.33333333333333333e-1')
    })

    it('should format bignumbers with custom precision, lower, and upper bound', function () {
      const Big = BigNumber.clone({ precision: 100 })

      const options = {
        notation: 'auto',
        precision: 50,
        lowerExp: -50,
        upperExp: 50
      }

      assert.deepStrictEqual(format(new Big(5).div(3), options), '1.6666666666666666666666666666666666666666666666667')
      assert.deepStrictEqual(format(new Big(5e+40).div(3), options), '16666666666666666666666666666666666666666.666666667')
      assert.deepStrictEqual(format(new Big(5e-40).div(3), options),
        '0.00000000000000000000000000000000000000016666666666666666666666666666666666666666666666667')
      assert.deepStrictEqual(format(new Big(5e+60).div(3), options), '1.6666666666666666666666666666666666666666666666667e+60')
      assert.deepStrictEqual(format(new Big(5e-60).div(3), options), '1.6666666666666666666666666666666666666666666666667e-60')
      assert.deepStrictEqual(format(new Big(5e-80).div(3), options), '1.6666666666666666666666666666666666666666666666667e-80')
    })

    it('auto notation with custom lower bound', function () {
      const options = {
        lowerExp: -6
      }
      assert.strictEqual(format(new BigNumber(0), options), '0')
      assert.strictEqual(format(new BigNumber(1e-5), options), '0.00001')
      assert.strictEqual(format(new BigNumber(1e-6), options), '0.000001')
      assert.strictEqual(format(new BigNumber(0.999e-6), options), '9.99e-7')
      assert.strictEqual(format(new BigNumber(1e-7), options), '1e-7')
    })

    it('auto notation with custom upper bound', function () {
      const options = {
        upperExp: 9
      }
      assert.strictEqual(format(new BigNumber(1e+9), options), '1e+9')
      assert.strictEqual(format(new BigNumber(1e+9 - 1), options), '999999999')
    })

    it('should format bignumbers in fixed notation', function () {
      const options = {
        notation: 'fixed'
      }

      assert.deepStrictEqual(format(new BigNumber('1.23456'), options), '1.23456')
      assert.deepStrictEqual(format(new BigNumber('1.7'), options), '1.7')
      assert.deepStrictEqual(format(new BigNumber('12345678'), options), '12345678')
      assert.deepStrictEqual(format(new BigNumber('12e18'), options), '12000000000000000000')
      assert.deepStrictEqual(format(new BigNumber('12e30'), options), '12000000000000000000000000000000')
    })

    it('should format bignumbers in fixed notation with precision', function () {
      const options = {
        notation: 'fixed',
        precision: 2
      }
      assert.deepStrictEqual(format(new BigNumber('1.23456'), options), '1.23')
      assert.deepStrictEqual(format(new BigNumber('12345678'), options), '12345678.00')
      assert.deepStrictEqual(format(new BigNumber('12e18'), options), '12000000000000000000.00')
      assert.deepStrictEqual(format(new BigNumber('12e30'), options), '12000000000000000000000000000000.00')
    })

    it('should throw an error on unknown notation', function () {
      assert.throws(function () {
        format(new BigNumber(123), { notation: 'non existing' })
      })
    })
  })

  it('should format a bignumber using toFixed', function () {
    const Big = BigNumber.clone({ precision: 100 })

    assert.strictEqual(toFixed(new Big(2.34)), '2.34')
    assert.strictEqual(toFixed(new Big(2.34), 1), '2.3')
    assert.strictEqual(toFixed(new Big(2), 20), '2.00000000000000000000')
    assert.strictEqual(toFixed(new Big(2), 21), '2.000000000000000000000')
    assert.strictEqual(toFixed(new Big(2), 22), '2.0000000000000000000000')
    assert.strictEqual(toFixed(new Big(2), 30), '2.000000000000000000000000000000')
  })

  it('should format a bignumber using toExponential', function () {
    const Big = BigNumber.clone({ precision: 100 })

    assert.strictEqual(toExponential(new Big(2.34)), '2.34e+0')
    assert.strictEqual(toExponential(new Big(2.34e+3)), '2.34e+3')
    assert.strictEqual(toExponential(new Big(2.34e-3)), '2.34e-3')
    assert.strictEqual(toExponential(new Big(2.34e+3), 2), '2.3e+3')
    assert.strictEqual(toExponential(new Big(2e+3), 20), '2.0000000000000000000e+3')
    assert.strictEqual(toExponential(new Big(2e+3), 21), '2.00000000000000000000e+3')
    assert.strictEqual(toExponential(new Big(2e+3), 22), '2.000000000000000000000e+3')
    assert.strictEqual(toExponential(new Big(2e+3), 30), '2.00000000000000000000000000000e+3')
    assert.strictEqual(toExponential(new Big('2e+300'), 30), '2.00000000000000000000000000000e+300')
    assert.strictEqual(toExponential(new Big('2e-300'), 30), '2.00000000000000000000000000000e-300')
  })
})