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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package strconv_test

import (
        "math"
        "math/rand"
        "reflect"
        . "strconv"
        "testing"
        "time"
)

type atofTest struct {
        in  string
        out string
        err error
}

var atoftests = []atofTest{
        {"", "0", ErrSyntax},
        {"1", "1", nil},
        {"+1", "1", nil},
        {"1x", "0", ErrSyntax},
        {"1.1.", "0", ErrSyntax},
        {"1e23", "1e+23", nil},
        {"1E23", "1e+23", nil},
        {"100000000000000000000000", "1e+23", nil},
        {"1e-100", "1e-100", nil},
        {"123456700", "1.234567e+08", nil},
        {"99999999999999974834176", "9.999999999999997e+22", nil},
        {"100000000000000000000001", "1.0000000000000001e+23", nil},
        {"100000000000000008388608", "1.0000000000000001e+23", nil},
        {"100000000000000016777215", "1.0000000000000001e+23", nil},
        {"100000000000000016777216", "1.0000000000000003e+23", nil},
        {"-1", "-1", nil},
        {"-0.1", "-0.1", nil},
        {"-0", "-0", nil},
        {"1e-20", "1e-20", nil},
        {"625e-3", "0.625", nil},

        // NaNs
        {"nan", "NaN", nil},
        {"NaN", "NaN", nil},
        {"NAN", "NaN", nil},

        // Infs
        {"inf", "+Inf", nil},
        {"-Inf", "-Inf", nil},
        {"+INF", "+Inf", nil},
        {"-Infinity", "-Inf", nil},
        {"+INFINITY", "+Inf", nil},
        {"Infinity", "+Inf", nil},

        // largest float64
        {"1.7976931348623157e308", "1.7976931348623157e+308", nil},
        {"-1.7976931348623157e308", "-1.7976931348623157e+308", nil},
        // next float64 - too large
        {"1.7976931348623159e308", "+Inf", ErrRange},
        {"-1.7976931348623159e308", "-Inf", ErrRange},
        // the border is ...158079
        // borderline - okay
        {"1.7976931348623158e308", "1.7976931348623157e+308", nil},
        {"-1.7976931348623158e308", "-1.7976931348623157e+308", nil},
        // borderline - too large
        {"1.797693134862315808e308", "+Inf", ErrRange},
        {"-1.797693134862315808e308", "-Inf", ErrRange},

        // a little too large
        {"1e308", "1e+308", nil},
        {"2e308", "+Inf", ErrRange},
        {"1e309", "+Inf", ErrRange},

        // way too large
        {"1e310", "+Inf", ErrRange},
        {"-1e310", "-Inf", ErrRange},
        {"1e400", "+Inf", ErrRange},
        {"-1e400", "-Inf", ErrRange},
        {"1e400000", "+Inf", ErrRange},
        {"-1e400000", "-Inf", ErrRange},

        // denormalized
        {"1e-305", "1e-305", nil},
        {"1e-306", "1e-306", nil},
        {"1e-307", "1e-307", nil},
        {"1e-308", "1e-308", nil},
        {"1e-309", "1e-309", nil},
        {"1e-310", "1e-310", nil},
        {"1e-322", "1e-322", nil},
        // smallest denormal
        {"5e-324", "5e-324", nil},
        {"4e-324", "5e-324", nil},
        {"3e-324", "5e-324", nil},
        // too small
        {"2e-324", "0", nil},
        // way too small
        {"1e-350", "0", nil},
        {"1e-400000", "0", nil},

        // try to overflow exponent
        {"1e-4294967296", "0", nil},
        {"1e+4294967296", "+Inf", ErrRange},
        {"1e-18446744073709551616", "0", nil},
        {"1e+18446744073709551616", "+Inf", ErrRange},

        // Parse errors
        {"1e", "0", ErrSyntax},
        {"1e-", "0", ErrSyntax},
        {".e-1", "0", ErrSyntax},

        // http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
        {"2.2250738585072012e-308", "2.2250738585072014e-308", nil},
        // http://www.exploringbinary.com/php-hangs-on-numeric-value-2-2250738585072011e-308/
        {"2.2250738585072011e-308", "2.225073858507201e-308", nil},

        // A very large number (initially wrongly parsed by the fast algorithm).
        {"4.630813248087435e+307", "4.630813248087435e+307", nil},
}

type atofSimpleTest struct {
        x float64
        s string
}

var (
        atofRandomTests        []atofSimpleTest
        benchmarksRandomBits   [1024]string
        benchmarksRandomNormal [1024]string
)

func init() {
        // The atof routines return NumErrors wrapping
        // the error and the string.  Convert the table above.
        for i := range atoftests {
                test := &atoftests[i]
                if test.err != nil {
                        test.err = &NumError{"ParseFloat", test.in, test.err}
                }
        }

        // Generate random inputs for tests and benchmarks
        rand.Seed(time.Now().UnixNano())
        if testing.Short() {
                atofRandomTests = make([]atofSimpleTest, 100)
        } else {
                atofRandomTests = make([]atofSimpleTest, 10000)
        }
        for i := range atofRandomTests {
                n := uint64(rand.Uint32())<<32 | uint64(rand.Uint32())
                x := math.Float64frombits(n)
                s := FormatFloat(x, 'g', -1, 64)
                atofRandomTests[i] = atofSimpleTest{x, s}
        }

        for i := range benchmarksRandomBits {
                bits := uint64(rand.Uint32())<<32 | uint64(rand.Uint32())
                x := math.Float64frombits(bits)
                benchmarksRandomBits[i] = FormatFloat(x, 'g', -1, 64)
        }

        for i := range benchmarksRandomNormal {
                x := rand.NormFloat64()
                benchmarksRandomNormal[i] = FormatFloat(x, 'g', -1, 64)
        }
}

func testAtof(t *testing.T, opt bool) {
        oldopt := SetOptimize(opt)
        for i := 0; i < len(atoftests); i++ {
                test := &atoftests[i]
                out, err := ParseFloat(test.in, 64)
                outs := FormatFloat(out, 'g', -1, 64)
                if outs != test.out || !reflect.DeepEqual(err, test.err) {
                        t.Errorf("ParseFloat(%v, 64) = %v, %v want %v, %v",
                                test.in, out, err, test.out, test.err)
                }

                if float64(float32(out)) == out {
                        out, err := ParseFloat(test.in, 32)
                        out32 := float32(out)
                        if float64(out32) != out {
                                t.Errorf("ParseFloat(%v, 32) = %v, not a float32 (closest is %v)", test.in, out, float64(out32))
                                continue
                        }
                        outs := FormatFloat(float64(out32), 'g', -1, 32)
                        if outs != test.out || !reflect.DeepEqual(err, test.err) {
                                t.Errorf("ParseFloat(%v, 32) = %v, %v want %v, %v  # %v",
                                        test.in, out32, err, test.out, test.err, out)
                        }
                }
        }
        SetOptimize(oldopt)
}

func TestAtof(t *testing.T) { testAtof(t, true) }

func TestAtofSlow(t *testing.T) { testAtof(t, false) }

func TestAtofRandom(t *testing.T) {
        for _, test := range atofRandomTests {
                x, _ := ParseFloat(test.s, 64)
                switch {
                default:
                        t.Errorf("number %s badly parsed as %b (expected %b)", test.s, x, test.x)
                case x == test.x:
                case math.IsNaN(test.x) && math.IsNaN(x):
                }
        }
        t.Logf("tested %d random numbers", len(atofRandomTests))
}

func BenchmarkAtof64Decimal(b *testing.B) {
        for i := 0; i < b.N; i++ {
                ParseFloat("33909", 64)
        }
}

func BenchmarkAtof64Float(b *testing.B) {
        for i := 0; i < b.N; i++ {
                ParseFloat("339.7784", 64)
        }
}

func BenchmarkAtof64FloatExp(b *testing.B) {
        for i := 0; i < b.N; i++ {
                ParseFloat("-5.09e75", 64)
        }
}

func BenchmarkAtof64Big(b *testing.B) {
        for i := 0; i < b.N; i++ {
                ParseFloat("123456789123456789123456789", 64)
        }
}

func BenchmarkAtof64RandomBits(b *testing.B) {
        for i := 0; i < b.N; i++ {
                ParseFloat(benchmarksRandomBits[i%1024], 64)
        }
}

func BenchmarkAtof64RandomFloats(b *testing.B) {
        for i := 0; i < b.N; i++ {
                ParseFloat(benchmarksRandomNormal[i%1024], 64)
        }
}