package fzf

import (

"math/rand"
"regexp"
"strings"
"testing"
"unicode/utf8"

"github.com/junegunn/fzf/src/tui"

)

// The following regular expression will include not all but most of the // frequently used ANSI sequences. This regex is used as a reference for // testing nextAnsiEscapeSequence(). // // References: // - github.com/gnachman/iTerm2 // - web.archive.org/web/20090204053813/http://ascii-table.com/ansi-escape-sequences.php // (archived from ascii-table.com/ansi-escape-sequences.php) // - web.archive.org/web/20090227051140/http://ascii-table.com/ansi-escape-sequences-vt-100.php // (archived from ascii-table.com/ansi-escape-sequences-vt-100.php) // - tldp.org/HOWTO/Bash-Prompt-HOWTO/x405.html // - invisible-island.net/xterm/ctlseqs/ctlseqs.html var ansiRegexReference = regexp.MustCompile(“(?:x1b[\[0-9;]*|x1b];[[:print:]]+(?:x1b\\|x07)|x1b.||.x08)”)

func testParserReference(t testing.TB, str string) {

t.Helper()

toSlice := func(start, end int) []int {
        if start == -1 {
                return nil
        }
        return []int{start, end}
}

s := str
for i := 0; ; i++ {
        got := toSlice(nextAnsiEscapeSequence(s))
        exp := ansiRegexReference.FindStringIndex(s)

        equal := len(got) == len(exp)
        if equal {
                for i := 0; i < len(got); i++ {
                        if got[i] != exp[i] {
                                equal = false
                                break
                        }
                }
        }
        if !equal {
                var exps, gots []rune
                if len(got) == 2 {
                        gots = []rune(s[got[0]:got[1]])
                }
                if len(exp) == 2 {
                        exps = []rune(s[exp[0]:exp[1]])
                }
                t.Errorf("%d: %q: got: %v (%q) want: %v (%q)", i, s, got, gots, exp, exps)
                return
        }
        if len(exp) == 0 {
                return
        }
        s = s[exp[1]:]
}

}

func TestNextAnsiEscapeSequence(t *testing.T) {

testStrs := []string{
        "\x1b[0mhello world",
        "\x1b[1mhello world",
        "椙\x1b[1m椙",
        "椙\x1b[1椙m椙",
        "\x1b[1mhello \x1b[mw\x1b7o\x1b8r\x1b(Bl\x1b[2@d",
        "\x1b[1mhello \x1b[Kworld",
        "hello \x1b[34;45;1mworld",
        "hello \x1b[34;45;1mwor\x1b[34;45;1mld",
        "hello \x1b[34;45;1mwor\x1b[0mld",
        "hello \x1b[34;48;5;233;1mwo\x1b[38;5;161mr\x1b[0ml\x1b[38;5;161md",
        "hello \x1b[38;5;38;48;5;48;1mwor\x1b[38;5;48;48;5;38ml\x1b[0md",
        "hello \x1b[32;1mworld",
        "hello world",
        "hello \x1b[0;38;5;200;48;5;100mworld",
        "\x1b椙",
        "椙\x08",
        "\n\x08",
        "X\x08",
        "",
        "\x1b]4;3;rgb:aa/bb/cc\x07 ",
        "\x1b]4;3;rgb:aa/bb/cc\x1b\\ ",
        ansiBenchmarkString,
}

for _, s := range testStrs {
        testParserReference(t, s)
}

}

func TestNextAnsiEscapeSequence_Fuzz_Modified(t *testing.T) {

t.Parallel()
if testing.Short() {
        t.Skip("short test")
}

testStrs := []string{
        "\x1b[0mhello world",
        "\x1b[1mhello world",
        "椙\x1b[1m椙",
        "椙\x1b[1椙m椙",
        "\x1b[1mhello \x1b[mw\x1b7o\x1b8r\x1b(Bl\x1b[2@d",
        "\x1b[1mhello \x1b[Kworld",
        "hello \x1b[34;45;1mworld",
        "hello \x1b[34;45;1mwor\x1b[34;45;1mld",
        "hello \x1b[34;45;1mwor\x1b[0mld",
        "hello \x1b[34;48;5;233;1mwo\x1b[38;5;161mr\x1b[0ml\x1b[38;5;161md",
        "hello \x1b[38;5;38;48;5;48;1mwor\x1b[38;5;48;48;5;38ml\x1b[0md",
        "hello \x1b[32;1mworld",
        "hello world",
        "hello \x1b[0;38;5;200;48;5;100mworld",
        ansiBenchmarkString,
}

replacementBytes := [...]rune{'\x0e', '\x0f', '\x1b', '\x08'}

modifyString := func(s string, rr *rand.Rand) string {
        n := rr.Intn(len(s))
        b := []rune(s)
        for ; n >= 0 && len(b) != 0; n-- {
                i := rr.Intn(len(b))
                switch x := rr.Intn(4); x {
                case 0:
                        b = append(b[:i], b[i+1:]...)
                case 1:
                        j := rr.Intn(len(replacementBytes) - 1)
                        b[i] = replacementBytes[j]
                case 2:
                        x := rune(rr.Intn(utf8.MaxRune))
                        for !utf8.ValidRune(x) {
                                x = rune(rr.Intn(utf8.MaxRune))
                        }
                        b[i] = x
                case 3:
                        b[i] = rune(rr.Intn(utf8.MaxRune)) // potentially invalid
                default:
                        t.Fatalf("unsupported value: %d", x)
                }
        }
        return string(b)
}

rr := rand.New(rand.NewSource(1))
for _, s := range testStrs {
        for i := 1_000; i >= 0; i-- {
                testParserReference(t, modifyString(s, rr))
        }
}

}

func TestNextAnsiEscapeSequence_Fuzz_Random(t *testing.T) {

t.Parallel()

if testing.Short() {
        t.Skip("short test")
}

randomString := func(rr *rand.Rand) string {
        numChars := rand.Intn(50)
        codePoints := make([]rune, numChars)
        for i := 0; i < len(codePoints); i++ {
                var r rune
                for n := 0; n < 1000; n++ {
                        r = rune(rr.Intn(utf8.MaxRune))
                        // Allow 10% of runes to be invalid
                        if utf8.ValidRune(r) || rr.Float64() < 0.10 {
                                break
                        }
                }
                codePoints[i] = r
        }
        return string(codePoints)
}

rr := rand.New(rand.NewSource(1))
for i := 0; i < 100_000; i++ {
        testParserReference(t, randomString(rr))
}

}

func TestExtractColor(t *testing.T) {

assert := func(offset ansiOffset, b int32, e int32, fg tui.Color, bg tui.Color, bold bool) {
        var attr tui.Attr
        if bold {
                attr = tui.Bold
        }
        if offset.offset[0] != b || offset.offset[1] != e ||
                offset.color.fg != fg || offset.color.bg != bg || offset.color.attr != attr {
                t.Error(offset, b, e, fg, bg, attr)
        }
}

src := "hello world"
var state *ansiState
clean := "\x1b[0m"
check := func(assertion func(ansiOffsets *[]ansiOffset, state *ansiState)) {
        output, ansiOffsets, newState := extractColor(src, state, nil)
        state = newState
        if output != "hello world" {
                t.Errorf("Invalid output: %s %v", output, []rune(output))
        }
        t.Log(src, ansiOffsets, clean)
        assertion(ansiOffsets, state)
}

check(func(offsets *[]ansiOffset, state *ansiState) {
        if offsets != nil {
                t.Fail()
        }
})

state = nil
src = "\x1b[0mhello world"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if offsets != nil {
                t.Fail()
        }
})

state = nil
src = "\x1b[1mhello world"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 1 {
                t.Fail()
        }
        assert((*offsets)[0], 0, 11, -1, -1, true)
})

state = nil
src = "\x1b[1mhello \x1b[mw\x1b7o\x1b8r\x1b(Bl\x1b[2@d"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 1 {
                t.Fail()
        }
        assert((*offsets)[0], 0, 6, -1, -1, true)
})

state = nil
src = "\x1b[1mhello \x1b[Kworld"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 1 {
                t.Fail()
        }
        assert((*offsets)[0], 0, 11, -1, -1, true)
})

state = nil
src = "hello \x1b[34;45;1mworld"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 1 {
                t.Fail()
        }
        assert((*offsets)[0], 6, 11, 4, 5, true)
})

state = nil
src = "hello \x1b[34;45;1mwor\x1b[34;45;1mld"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 1 {
                t.Fail()
        }
        assert((*offsets)[0], 6, 11, 4, 5, true)
})

state = nil
src = "hello \x1b[34;45;1mwor\x1b[0mld"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 1 {
                t.Fail()
        }
        assert((*offsets)[0], 6, 9, 4, 5, true)
})

state = nil
src = "hello \x1b[34;48;5;233;1mwo\x1b[38;5;161mr\x1b[0ml\x1b[38;5;161md"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 3 {
                t.Fail()
        }
        assert((*offsets)[0], 6, 8, 4, 233, true)
        assert((*offsets)[1], 8, 9, 161, 233, true)
        assert((*offsets)[2], 10, 11, 161, -1, false)
})

// {38,48};5;{38,48}
state = nil
src = "hello \x1b[38;5;38;48;5;48;1mwor\x1b[38;5;48;48;5;38ml\x1b[0md"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 2 {
                t.Fail()
        }
        assert((*offsets)[0], 6, 9, 38, 48, true)
        assert((*offsets)[1], 9, 10, 48, 38, true)
})

src = "hello \x1b[32;1mworld"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 1 {
                t.Fail()
        }
        if state.fg != 2 || state.bg != -1 || state.attr == 0 {
                t.Fail()
        }
        assert((*offsets)[0], 6, 11, 2, -1, true)
})

src = "hello world"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 1 {
                t.Fail()
        }
        if state.fg != 2 || state.bg != -1 || state.attr == 0 {
                t.Fail()
        }
        assert((*offsets)[0], 0, 11, 2, -1, true)
})

src = "hello \x1b[0;38;5;200;48;5;100mworld"
check(func(offsets *[]ansiOffset, state *ansiState) {
        if len(*offsets) != 2 {
                t.Fail()
        }
        if state.fg != 200 || state.bg != 100 || state.attr > 0 {
                t.Fail()
        }
        assert((*offsets)[0], 0, 6, 2, -1, true)
        assert((*offsets)[1], 6, 11, 200, 100, false)
})

}

func TestAnsiCodeStringConversion(t *testing.T) {

assert := func(code string, prevState *ansiState, expected string) {
        state := interpretCode(code, prevState)
        if expected != state.ToString() {
                t.Errorf("expected: %s, actual: %s",
                        strings.Replace(expected, "\x1b[", "\\x1b[", -1),
                        strings.Replace(state.ToString(), "\x1b[", "\\x1b[", -1))
        }
}
assert("\x1b[m", nil, "")
assert("\x1b[m", &ansiState{attr: tui.Blink, lbg: -1}, "")

assert("\x1b[31m", nil, "\x1b[31;49m")
assert("\x1b[41m", nil, "\x1b[39;41m")

assert("\x1b[92m", nil, "\x1b[92;49m")
assert("\x1b[102m", nil, "\x1b[39;102m")

assert("\x1b[31m", &ansiState{fg: 4, bg: 4, lbg: -1}, "\x1b[31;44m")
assert("\x1b[1;2;31m", &ansiState{fg: 2, bg: -1, attr: tui.Reverse, lbg: -1}, "\x1b[1;2;7;31;49m")
assert("\x1b[38;5;100;48;5;200m", nil, "\x1b[38;5;100;48;5;200m")
assert("\x1b[48;5;100;38;5;200m", nil, "\x1b[38;5;200;48;5;100m")
assert("\x1b[48;5;100;38;2;10;20;30;1m", nil, "\x1b[1;38;2;10;20;30;48;5;100m")
assert("\x1b[48;5;100;38;2;10;20;30;7m",
        &ansiState{attr: tui.Dim | tui.Italic, fg: 1, bg: 1},
        "\x1b[2;3;7;38;2;10;20;30;48;5;100m")

}

func TestParseAnsiCode(t *testing.T) {

tests := []struct {
        In, Exp string
        N       int
}{
        {"123", "", 123},
        {"1a", "", -1},
        {"1a;12", "12", -1},
        {"12;a", "a", 12},
        {"-2", "", -1},
}
for _, x := range tests {
        n, s := parseAnsiCode(x.In)
        if n != x.N || s != x.Exp {
                t.Fatalf("%q: got: (%d %q) want: (%d %q)", x.In, n, s, x.N, x.Exp)
        }
}

}

// kernel/bpf/preload/iterators/README const ansiBenchmarkString = “x1b[38;5;81mx1b[01;31mx1b[Kkernel/x1b[0mx1b[38;5;81mbpf/” +

"\x1b[0m\x1b[38;5;81mpreload/\x1b[0m\x1b[38;5;81miterators/" +
"\x1b[0m\x1b[38;5;149mMakefile\x1b[m\x1b[K\x1b[0m"

func BenchmarkNextAnsiEscapeSequence(b *testing.B) {

b.SetBytes(int64(len(ansiBenchmarkString)))
for i := 0; i < b.N; i++ {
        s := ansiBenchmarkString
        for {
                _, o := nextAnsiEscapeSequence(s)
                if o == -1 {
                        break
                }
                s = s[o:]
        }
}

}

// Baseline test to compare the speed of nextAnsiEscapeSequence() to the // previously used regex based implementation. func BenchmarkNextAnsiEscapeSequence_Regex(b *testing.B) {

b.SetBytes(int64(len(ansiBenchmarkString)))
for i := 0; i < b.N; i++ {
        s := ansiBenchmarkString
        for {
                a := ansiRegexReference.FindStringIndex(s)
                if len(a) == 0 {
                        break
                }
                s = s[a[1]:]
        }
}

}

func BenchmarkExtractColor(b *testing.B) {

b.SetBytes(int64(len(ansiBenchmarkString)))
for i := 0; i < b.N; i++ {
        extractColor(ansiBenchmarkString, nil, nil)
}

}