package pgx_test

import (
	"github.com/jackc/pgx"
	"net"
	"reflect"
	"strings"
	"testing"
	"time"
)

func TestDateTranscode(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	dates := []time.Time{
		time.Date(1, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(1000, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(1600, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(1700, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(1800, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(1900, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(1990, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(1999, 12, 31, 0, 0, 0, 0, time.Local),
		time.Date(2000, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(2001, 1, 2, 0, 0, 0, 0, time.Local),
		time.Date(2004, 2, 29, 0, 0, 0, 0, time.Local),
		time.Date(2013, 7, 4, 0, 0, 0, 0, time.Local),
		time.Date(2013, 12, 25, 0, 0, 0, 0, time.Local),
		time.Date(2029, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(2081, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(2096, 2, 29, 0, 0, 0, 0, time.Local),
		time.Date(2550, 1, 1, 0, 0, 0, 0, time.Local),
		time.Date(9999, 12, 31, 0, 0, 0, 0, time.Local),
	}

	for _, actualDate := range dates {
		var d time.Time

		err := conn.QueryRow("select $1::date", actualDate).Scan(&d)
		if err != nil {
			t.Fatalf("Unexpected failure on QueryRow Scan: %v", err)
		}
		if !actualDate.Equal(d) {
			t.Errorf("Did not transcode date successfully: %v is not %v", d, actualDate)
		}
	}
}

func TestTimestampTzTranscode(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	inputTime := time.Date(2013, 1, 2, 3, 4, 5, 6000, time.Local)

	var outputTime time.Time

	err := conn.QueryRow("select $1::timestamptz", inputTime).Scan(&outputTime)
	if err != nil {
		t.Fatalf("QueryRow Scan failed: %v", err)
	}
	if !inputTime.Equal(outputTime) {
		t.Errorf("Did not transcode time successfully: %v is not %v", outputTime, inputTime)
	}

	err = conn.QueryRow("select $1::timestamptz", inputTime).Scan(&outputTime)
	if err != nil {
		t.Fatalf("QueryRow Scan failed: %v", err)
	}
	if !inputTime.Equal(outputTime) {
		t.Errorf("Did not transcode time successfully: %v is not %v", outputTime, inputTime)
	}
}

func TestJsonAndJsonbTranscode(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	for _, oid := range []pgx.Oid{pgx.JsonOid, pgx.JsonbOid} {
		if _, ok := conn.PgTypes[oid]; !ok {
			return // No JSON/JSONB type -- must be running against old PostgreSQL
		}
		typename := conn.PgTypes[oid].Name

		testJsonString(t, conn, typename)
		testJsonStringPointer(t, conn, typename)
		testJsonSingleLevelStringMap(t, conn, typename)
		testJsonNestedMap(t, conn, typename)
		testJsonStringArray(t, conn, typename)
		testJsonInt64Array(t, conn, typename)
		testJsonInt16ArrayFailureDueToOverflow(t, conn, typename)
		testJsonStruct(t, conn, typename)
	}
}

func testJsonString(t *testing.T, conn *pgx.Conn, typename string) {
	input := `{"key": "value"}`
	expectedOutput := map[string]string{"key": "value"}
	var output map[string]string
	err := conn.QueryRow("select $1::"+typename, input).Scan(&output)
	if err != nil {
		t.Errorf("%s: QueryRow Scan failed: %v", typename, err)
		return
	}

	if !reflect.DeepEqual(expectedOutput, output) {
		t.Errorf("%s: Did not transcode map[string]string successfully: %v is not %v", typename, expectedOutput, output)
		return
	}
}

func testJsonStringPointer(t *testing.T, conn *pgx.Conn, typename string) {
	input := `{"key": "value"}`
	expectedOutput := map[string]string{"key": "value"}
	var output map[string]string
	err := conn.QueryRow("select $1::"+typename, &input).Scan(&output)
	if err != nil {
		t.Errorf("%s: QueryRow Scan failed: %v", typename, err)
		return
	}

	if !reflect.DeepEqual(expectedOutput, output) {
		t.Errorf("%s: Did not transcode map[string]string successfully: %v is not %v", typename, expectedOutput, output)
		return
	}
}

func testJsonSingleLevelStringMap(t *testing.T, conn *pgx.Conn, typename string) {
	input := map[string]string{"key": "value"}
	var output map[string]string
	err := conn.QueryRow("select $1::"+typename, input).Scan(&output)
	if err != nil {
		t.Errorf("%s: QueryRow Scan failed: %v", typename, err)
		return
	}

	if !reflect.DeepEqual(input, output) {
		t.Errorf("%s: Did not transcode map[string]string successfully: %v is not %v", typename, input, output)
		return
	}
}

func testJsonNestedMap(t *testing.T, conn *pgx.Conn, typename string) {
	input := map[string]interface{}{
		"name":      "Uncanny",
		"stats":     map[string]interface{}{"hp": float64(107), "maxhp": float64(150)},
		"inventory": []interface{}{"phone", "key"},
	}
	var output map[string]interface{}
	err := conn.QueryRow("select $1::"+typename, input).Scan(&output)
	if err != nil {
		t.Errorf("%s: QueryRow Scan failed: %v", typename, err)
		return
	}

	if !reflect.DeepEqual(input, output) {
		t.Errorf("%s: Did not transcode map[string]interface{} successfully: %v is not %v", typename, input, output)
		return
	}
}

func testJsonStringArray(t *testing.T, conn *pgx.Conn, typename string) {
	input := []string{"foo", "bar", "baz"}
	var output []string
	err := conn.QueryRow("select $1::"+typename, input).Scan(&output)
	if err != nil {
		t.Errorf("%s: QueryRow Scan failed: %v", typename, err)
	}

	if !reflect.DeepEqual(input, output) {
		t.Errorf("%s: Did not transcode []string successfully: %v is not %v", typename, input, output)
	}
}

func testJsonInt64Array(t *testing.T, conn *pgx.Conn, typename string) {
	input := []int64{1, 2, 234432}
	var output []int64
	err := conn.QueryRow("select $1::"+typename, input).Scan(&output)
	if err != nil {
		t.Errorf("%s: QueryRow Scan failed: %v", typename, err)
	}

	if !reflect.DeepEqual(input, output) {
		t.Errorf("%s: Did not transcode []int64 successfully: %v is not %v", typename, input, output)
	}
}

func testJsonInt16ArrayFailureDueToOverflow(t *testing.T, conn *pgx.Conn, typename string) {
	input := []int{1, 2, 234432}
	var output []int16
	err := conn.QueryRow("select $1::"+typename, input).Scan(&output)
	if err.Error() != "can't scan into dest[0]: json: cannot unmarshal number 234432 into Go value of type int16" {
		t.Errorf("%s: Expected *json.UnmarkalTypeError, but got %v", typename, err)
	}
}

func testJsonStruct(t *testing.T, conn *pgx.Conn, typename string) {
	type person struct {
		Name string `json:"name"`
		Age  int    `json:"age"`
	}

	input := person{
		Name: "John",
		Age:  42,
	}

	var output person

	err := conn.QueryRow("select $1::"+typename, input).Scan(&output)
	if err != nil {
		t.Errorf("%s: QueryRow Scan failed: %v", typename, err)
	}

	if !reflect.DeepEqual(input, output) {
		t.Errorf("%s: Did not transcode struct successfully: %v is not %v", typename, input, output)
	}
}

func mustParseCIDR(t *testing.T, s string) net.IPNet {
	_, ipnet, err := net.ParseCIDR(s)
	if err != nil {
		t.Fatal(err)
	}

	return *ipnet
}

func TestStringToNotTextTypeTranscode(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	input := "01086ee0-4963-4e35-9116-30c173a8d0bd"

	var output string
	err := conn.QueryRow("select $1::uuid", input).Scan(&output)
	if err != nil {
		t.Fatal(err)
	}
	if input != output {
		t.Errorf("uuid: Did not transcode string successfully: %s is not %s", input, output)
	}

	err = conn.QueryRow("select $1::uuid", &input).Scan(&output)
	if err != nil {
		t.Fatal(err)
	}
	if input != output {
		t.Errorf("uuid: Did not transcode pointer to string successfully: %s is not %s", input, output)
	}
}

func TestInetCidrTranscode(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	tests := []struct {
		sql   string
		value net.IPNet
	}{
		{"select $1::inet", mustParseCIDR(t, "0.0.0.0/32")},
		{"select $1::inet", mustParseCIDR(t, "127.0.0.1/32")},
		{"select $1::inet", mustParseCIDR(t, "12.34.56.0/32")},
		{"select $1::inet", mustParseCIDR(t, "192.168.1.0/24")},
		{"select $1::inet", mustParseCIDR(t, "255.0.0.0/8")},
		{"select $1::inet", mustParseCIDR(t, "255.255.255.255/32")},
		{"select $1::inet", mustParseCIDR(t, "::/128")},
		{"select $1::inet", mustParseCIDR(t, "::/0")},
		{"select $1::inet", mustParseCIDR(t, "::1/128")},
		{"select $1::inet", mustParseCIDR(t, "2607:f8b0:4009:80b::200e/128")},
		{"select $1::cidr", mustParseCIDR(t, "0.0.0.0/32")},
		{"select $1::cidr", mustParseCIDR(t, "127.0.0.1/32")},
		{"select $1::cidr", mustParseCIDR(t, "12.34.56.0/32")},
		{"select $1::cidr", mustParseCIDR(t, "192.168.1.0/24")},
		{"select $1::cidr", mustParseCIDR(t, "255.0.0.0/8")},
		{"select $1::cidr", mustParseCIDR(t, "255.255.255.255/32")},
		{"select $1::cidr", mustParseCIDR(t, "::/128")},
		{"select $1::cidr", mustParseCIDR(t, "::/0")},
		{"select $1::cidr", mustParseCIDR(t, "::1/128")},
		{"select $1::cidr", mustParseCIDR(t, "2607:f8b0:4009:80b::200e/128")},
	}

	for i, tt := range tests {
		var actual net.IPNet

		err := conn.QueryRow(tt.sql, tt.value).Scan(&actual)
		if err != nil {
			t.Errorf("%d. Unexpected failure: %v (sql -> %v, value -> %v)", i, err, tt.sql, tt.value)
			continue
		}

		if actual.String() != tt.value.String() {
			t.Errorf("%d. Expected %v, got %v (sql -> %v)", i, tt.value, actual, tt.sql)
		}

		ensureConnValid(t, conn)
	}
}

func TestInetCidrArrayTranscode(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	tests := []struct {
		sql   string
		value []net.IPNet
	}{
		{
			"select $1::inet[]",
			[]net.IPNet{
				mustParseCIDR(t, "0.0.0.0/32"),
				mustParseCIDR(t, "127.0.0.1/32"),
				mustParseCIDR(t, "12.34.56.0/32"),
				mustParseCIDR(t, "192.168.1.0/24"),
				mustParseCIDR(t, "255.0.0.0/8"),
				mustParseCIDR(t, "255.255.255.255/32"),
				mustParseCIDR(t, "::/128"),
				mustParseCIDR(t, "::/0"),
				mustParseCIDR(t, "::1/128"),
				mustParseCIDR(t, "2607:f8b0:4009:80b::200e/128"),
			},
		},
		{
			"select $1::cidr[]",
			[]net.IPNet{
				mustParseCIDR(t, "0.0.0.0/32"),
				mustParseCIDR(t, "127.0.0.1/32"),
				mustParseCIDR(t, "12.34.56.0/32"),
				mustParseCIDR(t, "192.168.1.0/24"),
				mustParseCIDR(t, "255.0.0.0/8"),
				mustParseCIDR(t, "255.255.255.255/32"),
				mustParseCIDR(t, "::/128"),
				mustParseCIDR(t, "::/0"),
				mustParseCIDR(t, "::1/128"),
				mustParseCIDR(t, "2607:f8b0:4009:80b::200e/128"),
			},
		},
	}

	for i, tt := range tests {
		var actual []net.IPNet

		err := conn.QueryRow(tt.sql, tt.value).Scan(&actual)
		if err != nil {
			t.Errorf("%d. Unexpected failure: %v (sql -> %v, value -> %v)", i, err, tt.sql, tt.value)
			continue
		}

		if !reflect.DeepEqual(actual, tt.value) {
			t.Errorf("%d. Expected %v, got %v (sql -> %v)", i, tt.value, actual, tt.sql)
		}

		ensureConnValid(t, conn)
	}
}

func TestInetCidrTranscodeWithJustIP(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	tests := []struct {
		sql   string
		value string
	}{
		{"select $1::inet", "0.0.0.0/32"},
		{"select $1::inet", "127.0.0.1/32"},
		{"select $1::inet", "12.34.56.0/32"},
		{"select $1::inet", "255.255.255.255/32"},
		{"select $1::inet", "::/128"},
		{"select $1::inet", "2607:f8b0:4009:80b::200e/128"},
		{"select $1::cidr", "0.0.0.0/32"},
		{"select $1::cidr", "127.0.0.1/32"},
		{"select $1::cidr", "12.34.56.0/32"},
		{"select $1::cidr", "255.255.255.255/32"},
		{"select $1::cidr", "::/128"},
		{"select $1::cidr", "2607:f8b0:4009:80b::200e/128"},
	}

	for i, tt := range tests {
		expected := mustParseCIDR(t, tt.value)
		var actual net.IPNet

		err := conn.QueryRow(tt.sql, expected.IP).Scan(&actual)
		if err != nil {
			t.Errorf("%d. Unexpected failure: %v (sql -> %v, value -> %v)", i, err, tt.sql, tt.value)
			continue
		}

		if actual.String() != expected.String() {
			t.Errorf("%d. Expected %v, got %v (sql -> %v)", i, tt.value, actual, tt.sql)
		}

		ensureConnValid(t, conn)
	}
}

func TestNullX(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	type allTypes struct {
		s   pgx.NullString
		i16 pgx.NullInt16
		i32 pgx.NullInt32
		i64 pgx.NullInt64
		f32 pgx.NullFloat32
		f64 pgx.NullFloat64
		b   pgx.NullBool
		t   pgx.NullTime
	}

	var actual, zero allTypes

	tests := []struct {
		sql       string
		queryArgs []interface{}
		scanArgs  []interface{}
		expected  allTypes
	}{
		{"select $1::text", []interface{}{pgx.NullString{String: "foo", Valid: true}}, []interface{}{&actual.s}, allTypes{s: pgx.NullString{String: "foo", Valid: true}}},
		{"select $1::text", []interface{}{pgx.NullString{String: "foo", Valid: false}}, []interface{}{&actual.s}, allTypes{s: pgx.NullString{String: "", Valid: false}}},
		{"select $1::int2", []interface{}{pgx.NullInt16{Int16: 1, Valid: true}}, []interface{}{&actual.i16}, allTypes{i16: pgx.NullInt16{Int16: 1, Valid: true}}},
		{"select $1::int2", []interface{}{pgx.NullInt16{Int16: 1, Valid: false}}, []interface{}{&actual.i16}, allTypes{i16: pgx.NullInt16{Int16: 0, Valid: false}}},
		{"select $1::int4", []interface{}{pgx.NullInt32{Int32: 1, Valid: true}}, []interface{}{&actual.i32}, allTypes{i32: pgx.NullInt32{Int32: 1, Valid: true}}},
		{"select $1::int4", []interface{}{pgx.NullInt32{Int32: 1, Valid: false}}, []interface{}{&actual.i32}, allTypes{i32: pgx.NullInt32{Int32: 0, Valid: false}}},
		{"select $1::int8", []interface{}{pgx.NullInt64{Int64: 1, Valid: true}}, []interface{}{&actual.i64}, allTypes{i64: pgx.NullInt64{Int64: 1, Valid: true}}},
		{"select $1::int8", []interface{}{pgx.NullInt64{Int64: 1, Valid: false}}, []interface{}{&actual.i64}, allTypes{i64: pgx.NullInt64{Int64: 0, Valid: false}}},
		{"select $1::float4", []interface{}{pgx.NullFloat32{Float32: 1.23, Valid: true}}, []interface{}{&actual.f32}, allTypes{f32: pgx.NullFloat32{Float32: 1.23, Valid: true}}},
		{"select $1::float4", []interface{}{pgx.NullFloat32{Float32: 1.23, Valid: false}}, []interface{}{&actual.f32}, allTypes{f32: pgx.NullFloat32{Float32: 0, Valid: false}}},
		{"select $1::float8", []interface{}{pgx.NullFloat64{Float64: 1.23, Valid: true}}, []interface{}{&actual.f64}, allTypes{f64: pgx.NullFloat64{Float64: 1.23, Valid: true}}},
		{"select $1::float8", []interface{}{pgx.NullFloat64{Float64: 1.23, Valid: false}}, []interface{}{&actual.f64}, allTypes{f64: pgx.NullFloat64{Float64: 0, Valid: false}}},
		{"select $1::bool", []interface{}{pgx.NullBool{Bool: true, Valid: true}}, []interface{}{&actual.b}, allTypes{b: pgx.NullBool{Bool: true, Valid: true}}},
		{"select $1::bool", []interface{}{pgx.NullBool{Bool: true, Valid: false}}, []interface{}{&actual.b}, allTypes{b: pgx.NullBool{Bool: false, Valid: false}}},
		{"select $1::timestamptz", []interface{}{pgx.NullTime{Time: time.Unix(123, 5000), Valid: true}}, []interface{}{&actual.t}, allTypes{t: pgx.NullTime{Time: time.Unix(123, 5000), Valid: true}}},
		{"select $1::timestamptz", []interface{}{pgx.NullTime{Time: time.Unix(123, 5000), Valid: false}}, []interface{}{&actual.t}, allTypes{t: pgx.NullTime{Time: time.Time{}, Valid: false}}},
		{"select $1::timestamp", []interface{}{pgx.NullTime{Time: time.Unix(123, 5000), Valid: true}}, []interface{}{&actual.t}, allTypes{t: pgx.NullTime{Time: time.Unix(123, 5000), Valid: true}}},
		{"select $1::timestamp", []interface{}{pgx.NullTime{Time: time.Unix(123, 5000), Valid: false}}, []interface{}{&actual.t}, allTypes{t: pgx.NullTime{Time: time.Time{}, Valid: false}}},
		{"select $1::date", []interface{}{pgx.NullTime{Time: time.Date(1990, 1, 1, 0, 0, 0, 0, time.Local), Valid: true}}, []interface{}{&actual.t}, allTypes{t: pgx.NullTime{Time: time.Date(1990, 1, 1, 0, 0, 0, 0, time.Local), Valid: true}}},
		{"select $1::date", []interface{}{pgx.NullTime{Time: time.Date(1990, 1, 1, 0, 0, 0, 0, time.Local), Valid: false}}, []interface{}{&actual.t}, allTypes{t: pgx.NullTime{Time: time.Time{}, Valid: false}}},
		{"select 42::int4, $1::float8", []interface{}{pgx.NullFloat64{Float64: 1.23, Valid: true}}, []interface{}{&actual.i32, &actual.f64}, allTypes{i32: pgx.NullInt32{Int32: 42, Valid: true}, f64: pgx.NullFloat64{Float64: 1.23, Valid: true}}},
	}

	for i, tt := range tests {
		actual = zero

		err := conn.QueryRow(tt.sql, tt.queryArgs...).Scan(tt.scanArgs...)
		if err != nil {
			t.Errorf("%d. Unexpected failure: %v (sql -> %v, queryArgs -> %v)", i, err, tt.sql, tt.queryArgs)
		}

		if actual != tt.expected {
			t.Errorf("%d. Expected %v, got %v (sql -> %v, queryArgs -> %v)", i, tt.expected, actual, tt.sql, tt.queryArgs)
		}

		ensureConnValid(t, conn)
	}
}

func TestArrayDecoding(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	tests := []struct {
		sql    string
		query  interface{}
		scan   interface{}
		assert func(*testing.T, interface{}, interface{})
	}{
		{
			"select $1::bool[]", []bool{true, false, true}, &[]bool{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]bool))) == false {
					t.Errorf("failed to encode bool[]")
				}
			},
		},
		{
			"select $1::smallint[]", []int16{2, 4, 484, 32767}, &[]int16{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]int16))) == false {
					t.Errorf("failed to encode smallint[]")
				}
			},
		},
		{
			"select $1::smallint[]", []uint16{2, 4, 484, 32767}, &[]uint16{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]uint16))) == false {
					t.Errorf("failed to encode smallint[]")
				}
			},
		},
		{
			"select $1::int[]", []int32{2, 4, 484}, &[]int32{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]int32))) == false {
					t.Errorf("failed to encode int[]")
				}
			},
		},
		{
			"select $1::int[]", []uint32{2, 4, 484, 2147483647}, &[]uint32{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]uint32))) == false {
					t.Errorf("failed to encode int[]")
				}
			},
		},
		{
			"select $1::bigint[]", []int64{2, 4, 484, 9223372036854775807}, &[]int64{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]int64))) == false {
					t.Errorf("failed to encode bigint[]")
				}
			},
		},
		{
			"select $1::bigint[]", []uint64{2, 4, 484, 9223372036854775807}, &[]uint64{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]uint64))) == false {
					t.Errorf("failed to encode bigint[]")
				}
			},
		},
		{
			"select $1::text[]", []string{"it's", "over", "9000!"}, &[]string{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]string))) == false {
					t.Errorf("failed to encode text[]")
				}
			},
		},
		{
			"select $1::timestamp[]", []time.Time{time.Unix(323232, 0), time.Unix(3239949334, 00)}, &[]time.Time{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]time.Time))) == false {
					t.Errorf("failed to encode time.Time[] to timestamp[]")
				}
			},
		},
		{
			"select $1::timestamptz[]", []time.Time{time.Unix(323232, 0), time.Unix(3239949334, 00)}, &[]time.Time{},
			func(t *testing.T, query, scan interface{}) {
				if reflect.DeepEqual(query, *(scan.(*[]time.Time))) == false {
					t.Errorf("failed to encode time.Time[] to timestamptz[]")
				}
			},
		},
	}

	for i, tt := range tests {
		err := conn.QueryRow(tt.sql, tt.query).Scan(tt.scan)
		if err != nil {
			t.Errorf(`%d. error reading array: %v`, i, err)
		}
		tt.assert(t, tt.query, tt.scan)
		ensureConnValid(t, conn)
	}
}

type shortScanner struct{}

func (*shortScanner) Scan(r *pgx.ValueReader) error {
	r.ReadByte()
	return nil
}

func TestShortScanner(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	rows, err := conn.Query("select 'ab', 'cd' union select 'cd', 'ef'")
	if err != nil {
		t.Error(err)
	}
	defer rows.Close()

	for rows.Next() {
		var s1, s2 shortScanner
		err = rows.Scan(&s1, &s2)
		if err != nil {
			t.Error(err)
		}
	}

	ensureConnValid(t, conn)
}

func TestEmptyArrayDecoding(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	var val []string

	err := conn.QueryRow("select array[]::text[]").Scan(&val)
	if err != nil {
		t.Errorf(`error reading array: %v`, err)
	}
	if len(val) != 0 {
		t.Errorf("Expected 0 values, got %d", len(val))
	}

	var n, m int32

	err = conn.QueryRow("select 1::integer, array[]::text[], 42::integer").Scan(&n, &val, &m)
	if err != nil {
		t.Errorf(`error reading array: %v`, err)
	}
	if len(val) != 0 {
		t.Errorf("Expected 0 values, got %d", len(val))
	}
	if n != 1 {
		t.Errorf("Expected n to be 1, but it was %d", n)
	}
	if m != 42 {
		t.Errorf("Expected n to be 42, but it was %d", n)
	}

	rows, err := conn.Query("select 1::integer, array['test']::text[] union select 2::integer, array[]::text[] union select 3::integer, array['test']::text[]")
	if err != nil {
		t.Errorf(`error retrieving rows with array: %v`, err)
	}
	defer rows.Close()

	for rows.Next() {
		err = rows.Scan(&n, &val)
		if err != nil {
			t.Errorf(`error reading array: %v`, err)
		}
	}

	ensureConnValid(t, conn)
}

func TestNullXMismatch(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	type allTypes struct {
		s   pgx.NullString
		i16 pgx.NullInt16
		i32 pgx.NullInt32
		i64 pgx.NullInt64
		f32 pgx.NullFloat32
		f64 pgx.NullFloat64
		b   pgx.NullBool
		t   pgx.NullTime
	}

	var actual, zero allTypes

	tests := []struct {
		sql       string
		queryArgs []interface{}
		scanArgs  []interface{}
		err       string
	}{
		{"select $1::date", []interface{}{pgx.NullString{String: "foo", Valid: true}}, []interface{}{&actual.s}, "invalid input syntax for type date"},
		{"select $1::date", []interface{}{pgx.NullInt16{Int16: 1, Valid: true}}, []interface{}{&actual.i16}, "cannot encode into OID 1082"},
		{"select $1::date", []interface{}{pgx.NullInt32{Int32: 1, Valid: true}}, []interface{}{&actual.i32}, "cannot encode into OID 1082"},
		{"select $1::date", []interface{}{pgx.NullInt64{Int64: 1, Valid: true}}, []interface{}{&actual.i64}, "cannot encode into OID 1082"},
		{"select $1::date", []interface{}{pgx.NullFloat32{Float32: 1.23, Valid: true}}, []interface{}{&actual.f32}, "cannot encode into OID 1082"},
		{"select $1::date", []interface{}{pgx.NullFloat64{Float64: 1.23, Valid: true}}, []interface{}{&actual.f64}, "cannot encode into OID 1082"},
		{"select $1::date", []interface{}{pgx.NullBool{Bool: true, Valid: true}}, []interface{}{&actual.b}, "cannot encode into OID 1082"},
		{"select $1::int4", []interface{}{pgx.NullTime{Time: time.Unix(123, 5000), Valid: true}}, []interface{}{&actual.t}, "cannot encode into OID 23"},
	}

	for i, tt := range tests {
		actual = zero

		err := conn.QueryRow(tt.sql, tt.queryArgs...).Scan(tt.scanArgs...)
		if err == nil || !strings.Contains(err.Error(), tt.err) {
			t.Errorf(`%d. Expected error to contain "%s", but it didn't: %v`, i, tt.err, err)
		}

		ensureConnValid(t, conn)
	}
}

func TestPointerPointer(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	type allTypes struct {
		s   *string
		i16 *int16
		i32 *int32
		i64 *int64
		f32 *float32
		f64 *float64
		b   *bool
		t   *time.Time
	}

	var actual, zero, expected allTypes

	{
		s := "foo"
		expected.s = &s
		i16 := int16(1)
		expected.i16 = &i16
		i32 := int32(1)
		expected.i32 = &i32
		i64 := int64(1)
		expected.i64 = &i64
		f32 := float32(1.23)
		expected.f32 = &f32
		f64 := float64(1.23)
		expected.f64 = &f64
		b := true
		expected.b = &b
		t := time.Unix(123, 5000)
		expected.t = &t
	}

	tests := []struct {
		sql       string
		queryArgs []interface{}
		scanArgs  []interface{}
		expected  allTypes
	}{
		{"select $1::text", []interface{}{expected.s}, []interface{}{&actual.s}, allTypes{s: expected.s}},
		{"select $1::text", []interface{}{zero.s}, []interface{}{&actual.s}, allTypes{}},
		{"select $1::int2", []interface{}{expected.i16}, []interface{}{&actual.i16}, allTypes{i16: expected.i16}},
		{"select $1::int2", []interface{}{zero.i16}, []interface{}{&actual.i16}, allTypes{}},
		{"select $1::int4", []interface{}{expected.i32}, []interface{}{&actual.i32}, allTypes{i32: expected.i32}},
		{"select $1::int4", []interface{}{zero.i32}, []interface{}{&actual.i32}, allTypes{}},
		{"select $1::int8", []interface{}{expected.i64}, []interface{}{&actual.i64}, allTypes{i64: expected.i64}},
		{"select $1::int8", []interface{}{zero.i64}, []interface{}{&actual.i64}, allTypes{}},
		{"select $1::float4", []interface{}{expected.f32}, []interface{}{&actual.f32}, allTypes{f32: expected.f32}},
		{"select $1::float4", []interface{}{zero.f32}, []interface{}{&actual.f32}, allTypes{}},
		{"select $1::float8", []interface{}{expected.f64}, []interface{}{&actual.f64}, allTypes{f64: expected.f64}},
		{"select $1::float8", []interface{}{zero.f64}, []interface{}{&actual.f64}, allTypes{}},
		{"select $1::bool", []interface{}{expected.b}, []interface{}{&actual.b}, allTypes{b: expected.b}},
		{"select $1::bool", []interface{}{zero.b}, []interface{}{&actual.b}, allTypes{}},
		{"select $1::timestamptz", []interface{}{expected.t}, []interface{}{&actual.t}, allTypes{t: expected.t}},
		{"select $1::timestamptz", []interface{}{zero.t}, []interface{}{&actual.t}, allTypes{}},
		{"select $1::timestamp", []interface{}{expected.t}, []interface{}{&actual.t}, allTypes{t: expected.t}},
		{"select $1::timestamp", []interface{}{zero.t}, []interface{}{&actual.t}, allTypes{}},
	}

	for i, tt := range tests {
		actual = zero

		err := conn.QueryRow(tt.sql, tt.queryArgs...).Scan(tt.scanArgs...)
		if err != nil {
			t.Errorf("%d. Unexpected failure: %v (sql -> %v, queryArgs -> %v)", i, err, tt.sql, tt.queryArgs)
		}

		if !reflect.DeepEqual(actual, tt.expected) {
			t.Errorf("%d. Expected %v, got %v (sql -> %v, queryArgs -> %v)", i, tt.expected, actual, tt.sql, tt.queryArgs)
		}

		ensureConnValid(t, conn)
	}
}

func TestPointerPointerNonZero(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	f := "foo"
	dest := &f

	err := conn.QueryRow("select $1::text", nil).Scan(&dest)
	if err != nil {
		t.Errorf("Unexpected failure scanning: %v", err)
	}
	if dest != nil {
		t.Errorf("Expected dest to be nil, got %#v", dest)
	}
}