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package outscript_test

import (

"testing"

"github.com/KarpelesLab/outscript"

)

func TestBtcAmountUnmarshalTextDecimal(t *testing.T) {

tests := []struct {

input string

want outscript.BtcAmount

}{

{"1.5", 150000000},

{"0.00000001", 1},

{"21000000.00000000", 2100000000000000},

{"0.1", 10000000},

{"100", 10000000000},

}

for _, tc := range tests {

var ba outscript.BtcAmount

err := ba.UnmarshalText([]byte(tc.input))

if err != nil {

t.Errorf("UnmarshalText(%q) failed: %s", tc.input, err)

continue

}

if ba != tc.want {

t.Errorf("UnmarshalText(%q) = %d, want %d", tc.input, ba, tc.want)

}

}

}

func TestBtcAmountUnmarshalTextHex(t *testing.T) {

var ba outscript.BtcAmount

err := ba.UnmarshalText([]byte("0x5f5e100"))

if err != nil {

t.Fatalf("UnmarshalText hex failed: %s", err)

}

if ba != 100000000 {

t.Errorf("expected 100000000, got %d", ba)

}

}

func TestBtcAmountUnmarshalTextInteger(t *testing.T) {

var ba outscript.BtcAmount

err := ba.UnmarshalText([]byte("50"))

if err != nil {

t.Fatalf("UnmarshalText integer failed: %s", err)

}

if ba != 5000000000 {

t.Errorf("expected 5000000000, got %d", ba)

}

}

func TestBtcAmountUnmarshalTextTooManyDecimals(t *testing.T) {

var ba outscript.BtcAmount

err := ba.UnmarshalText([]byte("1.123456789"))

if err == nil {

t.Error("expected error for >8 decimals, got nil")

}

}

// TestBtcAmountUnmarshalTextOverflow verifies that integer-overflow inputs are

// rejected rather than silently wrapping around uint64.

func TestBtcAmountUnmarshalTextOverflow(t *testing.T) {

overflowing := []string{

// integer * 1e8 overflow: MaxUint64/1e8 is ~1.8e11, so this overflows.

"1000000000000",

// decimal *10 loop overflow: combined digits == MaxUint64 with only one

// decimal, so the *=10 to reach 8 decimals overflows.

"1844674407370955161.5",

}

for _, s := range overflowing {

var ba outscript.BtcAmount

err := ba.UnmarshalText([]byte(s))

if err == nil {

t.Errorf("expected overflow error for %q, got nil (value=%d)", s, ba)

}

}

// A value that just fits should still succeed (21M BTC max supply).

var ba outscript.BtcAmount

if err := ba.UnmarshalText([]byte("21000000")); err != nil {

t.Errorf("unexpected error for in-range value: %s", err)

}

if ba != 21000000*1_0000_0000 {

t.Errorf("expected 2100000000000000, got %d", ba)

}

}

func TestBtcAmountUnmarshalJSONNull(t *testing.T) {

var ba outscript.BtcAmount

err := ba.UnmarshalJSON([]byte("null"))

if err != nil {

t.Errorf("UnmarshalJSON null failed: %s", err)

}

}

func TestBtcAmountUnmarshalJSONQuoted(t *testing.T) {

var ba outscript.BtcAmount

err := ba.UnmarshalJSON([]byte(`"1.5"`))

if err != nil {

t.Fatalf("UnmarshalJSON quoted failed: %s", err)

}

if ba != 150000000 {

t.Errorf("expected 150000000, got %d", ba)

}

}