// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
//
// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

package mysql

import (
	"bytes"
	"database/sql"
	"database/sql/driver"
	"encoding/binary"
	"testing"
	"time"
)

func TestLengthEncodedInteger(t *testing.T) {
	var integerTests = []struct {
		num     uint64
		encoded []byte
	}{
		{0x0000000000000000, []byte{0x00}},
		{0x0000000000000012, []byte{0x12}},
		{0x00000000000000fa, []byte{0xfa}},
		{0x0000000000000100, []byte{0xfc, 0x00, 0x01}},
		{0x0000000000001234, []byte{0xfc, 0x34, 0x12}},
		{0x000000000000ffff, []byte{0xfc, 0xff, 0xff}},
		{0x0000000000010000, []byte{0xfd, 0x00, 0x00, 0x01}},
		{0x0000000000123456, []byte{0xfd, 0x56, 0x34, 0x12}},
		{0x0000000000ffffff, []byte{0xfd, 0xff, 0xff, 0xff}},
		{0x0000000001000000, []byte{0xfe, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00}},
		{0x123456789abcdef0, []byte{0xfe, 0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34, 0x12}},
		{0xffffffffffffffff, []byte{0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}},
	}

	for _, tst := range integerTests {
		num, isNull, numLen := readLengthEncodedInteger(tst.encoded)
		if isNull {
			t.Errorf("%x: expected %d, got NULL", tst.encoded, tst.num)
		}
		if num != tst.num {
			t.Errorf("%x: expected %d, got %d", tst.encoded, tst.num, num)
		}
		if numLen != len(tst.encoded) {
			t.Errorf("%x: expected size %d, got %d", tst.encoded, len(tst.encoded), numLen)
		}
		encoded := appendLengthEncodedInteger(nil, num)
		if !bytes.Equal(encoded, tst.encoded) {
			t.Errorf("%v: expected %x, got %x", num, tst.encoded, encoded)
		}
	}
}

func TestFormatBinaryDateTime(t *testing.T) {
	rawDate := [11]byte{}
	binary.LittleEndian.PutUint16(rawDate[:2], 1978)   // years
	rawDate[2] = 12                                    // months
	rawDate[3] = 30                                    // days
	rawDate[4] = 15                                    // hours
	rawDate[5] = 46                                    // minutes
	rawDate[6] = 23                                    // seconds
	binary.LittleEndian.PutUint32(rawDate[7:], 987654) // microseconds
	expect := func(expected string, inlen, outlen uint8) {
		actual, _ := formatBinaryDateTime(rawDate[:inlen], outlen)
		bytes, ok := actual.([]byte)
		if !ok {
			t.Errorf("formatBinaryDateTime must return []byte, was %T", actual)
		}
		if string(bytes) != expected {
			t.Errorf(
				"expected %q, got %q for length in %d, out %d",
				expected, actual, inlen, outlen,
			)
		}
	}
	expect("0000-00-00", 0, 10)
	expect("0000-00-00 00:00:00", 0, 19)
	expect("1978-12-30", 4, 10)
	expect("1978-12-30 15:46:23", 7, 19)
	expect("1978-12-30 15:46:23.987654", 11, 26)
}

func TestFormatBinaryTime(t *testing.T) {
	expect := func(expected string, src []byte, outlen uint8) {
		actual, _ := formatBinaryTime(src, outlen)
		bytes, ok := actual.([]byte)
		if !ok {
			t.Errorf("formatBinaryDateTime must return []byte, was %T", actual)
		}
		if string(bytes) != expected {
			t.Errorf(
				"expected %q, got %q for src=%q and outlen=%d",
				expected, actual, src, outlen)
		}
	}

	// binary format:
	// sign (0: positive, 1: negative), days(4), hours, minutes, seconds, micro(4)

	// Zeros
	expect("00:00:00", []byte{}, 8)
	expect("00:00:00.0", []byte{}, 10)
	expect("00:00:00.000000", []byte{}, 15)

	// Without micro(4)
	expect("12:34:56", []byte{0, 0, 0, 0, 0, 12, 34, 56}, 8)
	expect("-12:34:56", []byte{1, 0, 0, 0, 0, 12, 34, 56}, 8)
	expect("12:34:56.00", []byte{0, 0, 0, 0, 0, 12, 34, 56}, 11)
	expect("24:34:56", []byte{0, 1, 0, 0, 0, 0, 34, 56}, 8)
	expect("-99:34:56", []byte{1, 4, 0, 0, 0, 3, 34, 56}, 8)
	expect("103079215103:34:56", []byte{0, 255, 255, 255, 255, 23, 34, 56}, 8)

	// With micro(4)
	expect("12:34:56.00", []byte{0, 0, 0, 0, 0, 12, 34, 56, 99, 0, 0, 0}, 11)
	expect("12:34:56.000099", []byte{0, 0, 0, 0, 0, 12, 34, 56, 99, 0, 0, 0}, 15)
}

func TestEscapeBackslash(t *testing.T) {
	expect := func(expected, value string) {
		actual := string(escapeBytesBackslash([]byte{}, []byte(value)))
		if actual != expected {
			t.Errorf(
				"expected %s, got %s",
				expected, actual,
			)
		}

		actual = string(escapeStringBackslash([]byte{}, value))
		if actual != expected {
			t.Errorf(
				"expected %s, got %s",
				expected, actual,
			)
		}
	}

	expect("foo\\0bar", "foo\x00bar")
	expect("foo\\nbar", "foo\nbar")
	expect("foo\\rbar", "foo\rbar")
	expect("foo\\Zbar", "foo\x1abar")
	expect("foo\\\"bar", "foo\"bar")
	expect("foo\\\\bar", "foo\\bar")
	expect("foo\\'bar", "foo'bar")
}

func TestEscapeQuotes(t *testing.T) {
	expect := func(expected, value string) {
		actual := string(escapeBytesQuotes([]byte{}, []byte(value)))
		if actual != expected {
			t.Errorf(
				"expected %s, got %s",
				expected, actual,
			)
		}

		actual = string(escapeStringQuotes([]byte{}, value))
		if actual != expected {
			t.Errorf(
				"expected %s, got %s",
				expected, actual,
			)
		}
	}

	expect("foo\x00bar", "foo\x00bar") // not affected
	expect("foo\nbar", "foo\nbar")     // not affected
	expect("foo\rbar", "foo\rbar")     // not affected
	expect("foo\x1abar", "foo\x1abar") // not affected
	expect("foo''bar", "foo'bar")      // affected
	expect("foo\"bar", "foo\"bar")     // not affected
}

func TestAtomicError(t *testing.T) {
	var ae atomicError
	if ae.Value() != nil {
		t.Fatal("Expected value to be nil")
	}

	ae.Set(ErrMalformPkt)
	if v := ae.Value(); v != ErrMalformPkt {
		if v == nil {
			t.Fatal("Value is still nil")
		}
		t.Fatal("Error did not match")
	}
	ae.Set(ErrPktSync)
	if ae.Value() == ErrMalformPkt {
		t.Fatal("Error still matches old error")
	}
	if v := ae.Value(); v != ErrPktSync {
		t.Fatal("Error did not match")
	}
}

func TestIsolationLevelMapping(t *testing.T) {
	data := []struct {
		level    driver.IsolationLevel
		expected string
	}{
		{
			level:    driver.IsolationLevel(sql.LevelReadCommitted),
			expected: "READ COMMITTED",
		},
		{
			level:    driver.IsolationLevel(sql.LevelRepeatableRead),
			expected: "REPEATABLE READ",
		},
		{
			level:    driver.IsolationLevel(sql.LevelReadUncommitted),
			expected: "READ UNCOMMITTED",
		},
		{
			level:    driver.IsolationLevel(sql.LevelSerializable),
			expected: "SERIALIZABLE",
		},
	}

	for i, td := range data {
		if actual, err := mapIsolationLevel(td.level); actual != td.expected || err != nil {
			t.Fatal(i, td.expected, actual, err)
		}
	}

	// check unsupported mapping
	expectedErr := "mysql: unsupported isolation level: 7"
	actual, err := mapIsolationLevel(driver.IsolationLevel(sql.LevelLinearizable))
	if actual != "" || err == nil {
		t.Fatal("Expected error on unsupported isolation level")
	}
	if err.Error() != expectedErr {
		t.Fatalf("Expected error to be %q, got %q", expectedErr, err)
	}
}

func TestAppendDateTime(t *testing.T) {
	tests := []struct {
		t            time.Time
		str          string
		timeTruncate time.Duration
		expectedErr  bool
	}{
		{
			t:   time.Date(1234, 5, 6, 0, 0, 0, 0, time.UTC),
			str: "1234-05-06",
		},
		{
			t:   time.Date(4567, 12, 31, 12, 0, 0, 0, time.UTC),
			str: "4567-12-31 12:00:00",
		},
		{
			t:   time.Date(2020, 5, 30, 12, 34, 0, 0, time.UTC),
			str: "2020-05-30 12:34:00",
		},
		{
			t:   time.Date(2020, 5, 30, 12, 34, 56, 0, time.UTC),
			str: "2020-05-30 12:34:56",
		},
		{
			t:   time.Date(2020, 5, 30, 22, 33, 44, 123000000, time.UTC),
			str: "2020-05-30 22:33:44.123",
		},
		{
			t:   time.Date(2020, 5, 30, 22, 33, 44, 123456000, time.UTC),
			str: "2020-05-30 22:33:44.123456",
		},
		{
			t:   time.Date(2020, 5, 30, 22, 33, 44, 123456789, time.UTC),
			str: "2020-05-30 22:33:44.123456789",
		},
		{
			t:   time.Date(9999, 12, 31, 23, 59, 59, 999999999, time.UTC),
			str: "9999-12-31 23:59:59.999999999",
		},
		{
			t:   time.Date(1, 1, 1, 0, 0, 0, 0, time.UTC),
			str: "0001-01-01",
		},
		// Truncated time
		{
			t:            time.Date(1234, 5, 6, 0, 0, 0, 0, time.UTC),
			str:          "1234-05-06",
			timeTruncate: time.Second,
		},
		{
			t:            time.Date(4567, 12, 31, 12, 0, 0, 0, time.UTC),
			str:          "4567-12-31 12:00:00",
			timeTruncate: time.Minute,
		},
		{
			t:            time.Date(2020, 5, 30, 12, 34, 0, 0, time.UTC),
			str:          "2020-05-30 12:34:00",
			timeTruncate: 0,
		},
		{
			t:            time.Date(2020, 5, 30, 12, 34, 56, 0, time.UTC),
			str:          "2020-05-30 12:34:56",
			timeTruncate: time.Second,
		},
		{
			t:            time.Date(2020, 5, 30, 22, 33, 44, 123000000, time.UTC),
			str:          "2020-05-30 22:33:44",
			timeTruncate: time.Second,
		},
		{
			t:            time.Date(2020, 5, 30, 22, 33, 44, 123456000, time.UTC),
			str:          "2020-05-30 22:33:44.123",
			timeTruncate: time.Millisecond,
		},
		{
			t:            time.Date(2020, 5, 30, 22, 33, 44, 123456789, time.UTC),
			str:          "2020-05-30 22:33:44",
			timeTruncate: time.Second,
		},
		{
			t:            time.Date(9999, 12, 31, 23, 59, 59, 999999999, time.UTC),
			str:          "9999-12-31 23:59:59.999999999",
			timeTruncate: 0,
		},
		{
			t:            time.Date(1, 1, 1, 1, 1, 1, 1, time.UTC),
			str:          "0001-01-01",
			timeTruncate: 365 * 24 * time.Hour,
		},
		// year out of range
		{
			t:           time.Date(0, 1, 1, 0, 0, 0, 0, time.UTC),
			expectedErr: true,
		},
		{
			t:           time.Date(10000, 1, 1, 0, 0, 0, 0, time.UTC),
			expectedErr: true,
		},
	}
	for _, v := range tests {
		buf := make([]byte, 0, 32)
		buf, err := appendDateTime(buf, v.t, v.timeTruncate)
		if err != nil {
			if !v.expectedErr {
				t.Errorf("appendDateTime(%v) returned an error: %v", v.t, err)
			}
			continue
		}
		if str := string(buf); str != v.str {
			t.Errorf("appendDateTime(%v), have: %s, want: %s", v.t, str, v.str)
		}
	}
}

func TestParseDateTime(t *testing.T) {
	cases := []struct {
		name string
		str  string
	}{
		{
			name: "parse date",
			str:  "2020-05-13",
		},
		{
			name: "parse null date",
			str:  sDate0,
		},
		{
			name: "parse datetime",
			str:  "2020-05-13 21:30:45",
		},
		{
			name: "parse null datetime",
			str:  sDateTime0,
		},
		{
			name: "parse datetime nanosec 1-digit",
			str:  "2020-05-25 23:22:01.1",
		},
		{
			name: "parse datetime nanosec 2-digits",
			str:  "2020-05-25 23:22:01.15",
		},
		{
			name: "parse datetime nanosec 3-digits",
			str:  "2020-05-25 23:22:01.159",
		},
		{
			name: "parse datetime nanosec 4-digits",
			str:  "2020-05-25 23:22:01.1594",
		},
		{
			name: "parse datetime nanosec 5-digits",
			str:  "2020-05-25 23:22:01.15949",
		},
		{
			name: "parse datetime nanosec 6-digits",
			str:  "2020-05-25 23:22:01.159491",
		},
	}

	for _, loc := range []*time.Location{
		time.UTC,
		time.FixedZone("test", 8*60*60),
	} {
		for _, cc := range cases {
			t.Run(cc.name+"-"+loc.String(), func(t *testing.T) {
				var want time.Time
				if cc.str != sDate0 && cc.str != sDateTime0 {
					var err error
					want, err = time.ParseInLocation(timeFormat[:len(cc.str)], cc.str, loc)
					if err != nil {
						t.Fatal(err)
					}
				}
				got, err := parseDateTime([]byte(cc.str), loc)
				if err != nil {
					t.Fatal(err)
				}

				if !want.Equal(got) {
					t.Fatalf("want: %v, but got %v", want, got)
				}
			})
		}
	}
}

func TestInvalidDateTime(t *testing.T) {
	cases := []struct {
		name string
		str  string
		want time.Time
	}{
		{
			name: "parse datetime without day",
			str:  "0000-00-00 21:30:45",
			want: time.Date(0, 0, 0, 21, 30, 45, 0, time.UTC),
		},
	}

	for _, cc := range cases {
		t.Run(cc.name, func(t *testing.T) {
			got, err := parseDateTime([]byte(cc.str), time.UTC)
			if err != nil {
				t.Fatal(err)
			}

			if !cc.want.Equal(got) {
				t.Fatalf("want: %v, but got %v", cc.want, got)
			}
		})
	}
}

func TestParseDateTimeFail(t *testing.T) {
	cases := []struct {
		name    string
		str     string
		wantErr string
	}{
		{
			name:    "parse invalid time",
			str:     "hello",
			wantErr: "invalid time bytes: hello",
		},
		{
			name:    "parse year",
			str:     "000!-00-00 00:00:00.000000",
			wantErr: "not [0-9]",
		},
		{
			name:    "parse month",
			str:     "0000-!0-00 00:00:00.000000",
			wantErr: "not [0-9]",
		},
		{
			name:    `parse "-" after parsed year`,
			str:     "0000:00-00 00:00:00.000000",
			wantErr: "bad value for field: `:`",
		},
		{
			name:    `parse "-" after parsed month`,
			str:     "0000-00:00 00:00:00.000000",
			wantErr: "bad value for field: `:`",
		},
		{
			name:    `parse " " after parsed date`,
			str:     "0000-00-00+00:00:00.000000",
			wantErr: "bad value for field: `+`",
		},
		{
			name:    `parse ":" after parsed date`,
			str:     "0000-00-00 00-00:00.000000",
			wantErr: "bad value for field: `-`",
		},
		{
			name:    `parse ":" after parsed hour`,
			str:     "0000-00-00 00:00-00.000000",
			wantErr: "bad value for field: `-`",
		},
		{
			name:    `parse "." after parsed sec`,
			str:     "0000-00-00 00:00:00?000000",
			wantErr: "bad value for field: `?`",
		},
	}

	for _, cc := range cases {
		t.Run(cc.name, func(t *testing.T) {
			got, err := parseDateTime([]byte(cc.str), time.UTC)
			if err == nil {
				t.Fatal("want error")
			}
			if cc.wantErr != err.Error() {
				t.Fatalf("want `%s`, but got `%s`", cc.wantErr, err)
			}
			if !got.IsZero() {
				t.Fatal("want zero time")
			}
		})
	}
}