package null

import (
	"encoding/json"
	"testing"
)

var (
	intJSON     = []byte(`12345`)
	nullIntJSON = []byte(`{"Int64":12345,"Valid":true}`)
	zeroJSON    = []byte(`0`)
)

func TestIntFrom(t *testing.T) {
	i := IntFrom(12345)
	assertInt(t, i, "IntFrom()")

	zero := IntFrom(0)
	if zero.Valid {
		t.Error("IntFrom(0)", "is valid, but should be invalid")
	}
}

func TestIntFromPtr(t *testing.T) {
	n := int64(12345)
	iptr := &n
	i := IntFromPtr(iptr)
	assertInt(t, i, "IntFromPtr()")

	null := IntFromPtr(nil)
	assertNullInt(t, null, "IntFromPtr(nil)")
}

func TestUnmarshalInt(t *testing.T) {
	var i Int
	err := json.Unmarshal(intJSON, &i)
	maybePanic(err)
	assertInt(t, i, "int json")

	var ni Int
	err = json.Unmarshal(nullIntJSON, &ni)
	maybePanic(err)
	assertInt(t, ni, "sq.NullInt64 json")

	var zero Int
	err = json.Unmarshal(zeroJSON, &zero)
	maybePanic(err)
	assertNullInt(t, zero, "zero json")

	var null Int
	err = json.Unmarshal(nullJSON, &null)
	maybePanic(err)
	assertNullInt(t, null, "null json")
}

func TestTextUnmarshalInt(t *testing.T) {
	var i Int
	err := i.UnmarshalText([]byte("12345"))
	maybePanic(err)
	assertInt(t, i, "UnmarshalText() int")

	var zero Int
	err = zero.UnmarshalText([]byte("0"))
	maybePanic(err)
	assertNullInt(t, zero, "UnmarshalText() zero int")

	var blank Int
	err = blank.UnmarshalText([]byte(""))
	maybePanic(err)
	assertNullInt(t, blank, "UnmarshalText() empty int")

	var null Int
	err = null.UnmarshalText([]byte("null"))
	maybePanic(err)
	assertNullInt(t, null, `UnmarshalText() "null"`)
}

func TestMarshalInt(t *testing.T) {
	i := IntFrom(12345)
	data, err := json.Marshal(i)
	maybePanic(err)
	assertJSONEquals(t, data, "12345", "non-empty json marshal")

	// invalid values should be encoded as 0
	null := NewInt(0, false)
	data, err = json.Marshal(null)
	maybePanic(err)
	assertJSONEquals(t, data, "0", "null json marshal")
}

func TestMarshalIntText(t *testing.T) {
	i := IntFrom(12345)
	data, err := i.MarshalText()
	maybePanic(err)
	assertJSONEquals(t, data, "12345", "non-empty text marshal")

	// invalid values should be encoded as zero
	null := NewInt(0, false)
	data, err = null.MarshalText()
	maybePanic(err)
	assertJSONEquals(t, data, "0", "null text marshal")
}

func TestIntPointer(t *testing.T) {
	i := IntFrom(12345)
	ptr := i.Ptr()
	if *ptr != 12345 {
		t.Errorf("bad %s int: %#v ≠ %s\n", "pointer", ptr, 12345)
	}

	null := NewInt(0, false)
	ptr = null.Ptr()
	if ptr != nil {
		t.Errorf("bad %s int: %#v ≠ %s\n", "nil pointer", ptr, "nil")
	}
}

func TestIntIsZero(t *testing.T) {
	i := IntFrom(12345)
	if i.IsZero() {
		t.Errorf("IsZero() should be false")
	}

	null := NewInt(0, false)
	if !null.IsZero() {
		t.Errorf("IsZero() should be true")
	}

	zero := NewInt(0, true)
	if !zero.IsZero() {
		t.Errorf("IsZero() should be true")
	}
}

func TestIntScan(t *testing.T) {
	var i Int
	err := i.Scan(12345)
	maybePanic(err)
	assertInt(t, i, "scanned int")

	var null Int
	err = null.Scan(nil)
	maybePanic(err)
	assertNullInt(t, null, "scanned null")
}

func assertInt(t *testing.T, i Int, from string) {
	if i.Int64 != 12345 {
		t.Errorf("bad %s int: %d ≠ %d\n", from, i.Int64, 12345)
	}
	if !i.Valid {
		t.Error(from, "is invalid, but should be valid")
	}
}

func assertNullInt(t *testing.T, i Int, from string) {
	if i.Valid {
		t.Error(from, "is valid, but should be invalid")
	}
}