package pgtype_test

import (
	"context"
	"reflect"
	"testing"
	"time"

	"github.com/jackc/pgx/v5/pgtype"
	"github.com/jackc/pgx/v5/pgtype/testutil"
	"github.com/stretchr/testify/require"
)

func TestTimestampTranscode(t *testing.T) {
	testutil.TestSuccessfulTranscodeEqFunc(t, "timestamp", []interface{}{
		&pgtype.Timestamp{Time: time.Date(1800, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{Time: time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{Time: time.Date(1905, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{Time: time.Date(1940, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{Time: time.Date(1960, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{Time: time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{Time: time.Date(1999, 12, 31, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{Time: time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{Time: time.Date(2000, 1, 2, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{Time: time.Date(2200, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true},
		&pgtype.Timestamp{},
		&pgtype.Timestamp{Valid: true, InfinityModifier: pgtype.Infinity},
		&pgtype.Timestamp{Valid: true, InfinityModifier: -pgtype.Infinity},
	}, func(a, b interface{}) bool {
		at := a.(pgtype.Timestamp)
		bt := b.(pgtype.Timestamp)

		return at.Time.Equal(bt.Time) && at.Valid == bt.Valid && at.InfinityModifier == bt.InfinityModifier
	})
}

// https://github.com/jackc/pgx/v4/pgtype/pull/128
func TestTimestampTranscodeBigTimeBinary(t *testing.T) {
	conn := testutil.MustConnectPgx(t)
	if _, ok := conn.ConnInfo().DataTypeForName("line"); !ok {
		t.Skip("Skipping due to no line type")
	}
	defer testutil.MustCloseContext(t, conn)

	in := &pgtype.Timestamp{Time: time.Date(294276, 12, 31, 23, 59, 59, 999999000, time.UTC), Valid: true}
	var out pgtype.Timestamp

	err := conn.QueryRow(context.Background(), "select $1::timestamptz", in).Scan(&out)
	if err != nil {
		t.Fatal(err)
	}

	require.Equal(t, in.Valid, out.Valid)
	require.Truef(t, in.Time.Equal(out.Time), "expected %v got %v", in.Time, out.Time)
}

func TestTimestampNanosecondsTruncated(t *testing.T) {
	tests := []struct {
		input    time.Time
		expected time.Time
	}{
		{time.Date(2020, 1, 1, 0, 0, 0, 999999999, time.UTC), time.Date(2020, 1, 1, 0, 0, 0, 999999000, time.UTC)},
		{time.Date(2020, 1, 1, 0, 0, 0, 999999001, time.UTC), time.Date(2020, 1, 1, 0, 0, 0, 999999000, time.UTC)},
	}
	for i, tt := range tests {
		{
			ts := pgtype.Timestamp{Time: tt.input, Valid: true}
			buf, err := ts.EncodeText(nil, nil)
			if err != nil {
				t.Errorf("%d. EncodeText failed - %v", i, err)
			}

			ts.DecodeText(nil, buf)
			if err != nil {
				t.Errorf("%d. DecodeText failed - %v", i, err)
			}

			if !(ts.Valid && ts.Time.Equal(tt.expected)) {
				t.Errorf("%d. EncodeText did not truncate nanoseconds", i)
			}
		}

		{
			ts := pgtype.Timestamp{Time: tt.input, Valid: true}
			buf, err := ts.EncodeBinary(nil, nil)
			if err != nil {
				t.Errorf("%d. EncodeBinary failed - %v", i, err)
			}

			ts.DecodeBinary(nil, buf)
			if err != nil {
				t.Errorf("%d. DecodeBinary failed - %v", i, err)
			}

			if !(ts.Valid && ts.Time.Equal(tt.expected)) {
				t.Errorf("%d. EncodeBinary did not truncate nanoseconds", i)
			}
		}
	}
}

// https://github.com/jackc/pgtype/issues/74
func TestTimestampDecodeTextInvalid(t *testing.T) {
	tstz := &pgtype.Timestamp{}
	err := tstz.DecodeText(nil, []byte(`eeeee`))
	require.Error(t, err)
}

func TestTimestampSet(t *testing.T) {
	type _time time.Time

	successfulTests := []struct {
		source interface{}
		result pgtype.Timestamp
	}{
		{source: time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC), result: pgtype.Timestamp{Time: time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true}},
		{source: time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC), result: pgtype.Timestamp{Time: time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true}},
		{source: time.Date(1999, 12, 31, 12, 59, 59, 0, time.UTC), result: pgtype.Timestamp{Time: time.Date(1999, 12, 31, 12, 59, 59, 0, time.UTC), Valid: true}},
		{source: time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC), result: pgtype.Timestamp{Time: time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true}},
		{source: time.Date(2000, 1, 1, 0, 0, 1, 0, time.UTC), result: pgtype.Timestamp{Time: time.Date(2000, 1, 1, 0, 0, 1, 0, time.UTC), Valid: true}},
		{source: time.Date(2200, 1, 1, 0, 0, 0, 0, time.UTC), result: pgtype.Timestamp{Time: time.Date(2200, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true}},
		{source: time.Date(2015, 1, 1, 0, 0, 0, 0, time.Local), result: pgtype.Timestamp{Time: time.Date(2015, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true}},
		{source: _time(time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC)), result: pgtype.Timestamp{Time: time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true}},
		{source: pgtype.Infinity, result: pgtype.Timestamp{InfinityModifier: pgtype.Infinity, Valid: true}},
		{source: pgtype.NegativeInfinity, result: pgtype.Timestamp{InfinityModifier: pgtype.NegativeInfinity, Valid: true}},
	}

	for i, tt := range successfulTests {
		var r pgtype.Timestamp
		err := r.Set(tt.source)
		if err != nil {
			t.Errorf("%d: %v", i, err)
		}

		if r != tt.result {
			t.Errorf("%d: expected %v to convert to %v, but it was %v", i, tt.source, tt.result, r)
		}
	}
}

func TestTimestampAssignTo(t *testing.T) {
	var tim time.Time
	var ptim *time.Time

	simpleTests := []struct {
		src      pgtype.Timestamp
		dst      interface{}
		expected interface{}
	}{
		{src: pgtype.Timestamp{Time: time.Date(2015, 1, 1, 0, 0, 0, 0, time.UTC), Valid: true}, dst: &tim, expected: time.Date(2015, 1, 1, 0, 0, 0, 0, time.UTC)},
		{src: pgtype.Timestamp{Time: time.Time{}}, dst: &ptim, expected: ((*time.Time)(nil))},
	}

	for i, tt := range simpleTests {
		err := tt.src.AssignTo(tt.dst)
		if err != nil {
			t.Errorf("%d: %v", i, err)
		}

		if dst := reflect.ValueOf(tt.dst).Elem().Interface(); dst != tt.expected {
			t.Errorf("%d: expected %v to assign %v, but result was %v", i, tt.src, tt.expected, dst)
		}
	}

	pointerAllocTests := []struct {
		src      pgtype.Timestamp
		dst      interface{}
		expected interface{}
	}{
		{src: pgtype.Timestamp{Time: time.Date(2015, 1, 1, 0, 0, 0, 0, time.Local), Valid: true}, dst: &ptim, expected: time.Date(2015, 1, 1, 0, 0, 0, 0, time.Local)},
	}

	for i, tt := range pointerAllocTests {
		err := tt.src.AssignTo(tt.dst)
		if err != nil {
			t.Errorf("%d: %v", i, err)
		}

		if dst := reflect.ValueOf(tt.dst).Elem().Elem().Interface(); dst != tt.expected {
			t.Errorf("%d: expected %v to assign %v, but result was %v", i, tt.src, tt.expected, dst)
		}
	}

	errorTests := []struct {
		src pgtype.Timestamp
		dst interface{}
	}{
		{src: pgtype.Timestamp{Time: time.Date(2015, 1, 1, 0, 0, 0, 0, time.Local), InfinityModifier: pgtype.Infinity, Valid: true}, dst: &tim},
		{src: pgtype.Timestamp{Time: time.Date(2015, 1, 1, 0, 0, 0, 0, time.Local), InfinityModifier: pgtype.NegativeInfinity, Valid: true}, dst: &tim},
		{src: pgtype.Timestamp{Time: time.Date(2015, 1, 1, 0, 0, 0, 0, time.Local)}, dst: &tim},
	}

	for i, tt := range errorTests {
		err := tt.src.AssignTo(tt.dst)
		if err == nil {
			t.Errorf("%d: expected error but none was returned (%v -> %v)", i, tt.src, tt.dst)
		}
	}
}