// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package symbolize

import (
	"bytes"
	"context"
	"os"
	"strings"
	"testing"
)

type triggerTester struct {
	count    uint64
	sinkType string
	name     string
	src      LineSource
	mod      Module
	seg      Segment
	t        *testing.T
}

func (t *triggerTester) HandleDump(dump *DumpfileElement) {
	t.count += 1
	if dump == nil {
		t.t.Fatal("dump was nil")
	}
	t.sinkType = dump.SinkType()
	t.name = dump.Name()
	t.src = dump.Context().Source
	mods := dump.Context().Mods
	segs := dump.Context().Segs
	if len(mods) != 1 {
		t.t.Fatal("expected exactly 1 module")
	}
	t.mod = mods[0]
	if len(segs) != 1 {
		t.t.Fatal("expected exactly 1 segment")
	}
	t.seg = segs[0]
}

func TestDumpfile(t *testing.T) {
	msg := "[123.456] 1234.5678> {{{module:1:libc.so:elf:4fcb712aa6387724a9f465a32cd8c14b}}}\n" +
		"[123.456] 1234.5678> {{{mmap:0x12345000:849596:load:1:rx:0x0}}}\n" +
		"[123.456] 1234.5678> {{{dumpfile:llvm-cov:test}}}\n"

	symbo := newMockSymbolizer([]mockModule{})
	repo := NewRepo()
	demuxer := NewDemuxer(repo, symbo)
	tap := NewTriggerTap()
	tHandler := &triggerTester{t: t}
	tap.AddHandler(tHandler.HandleDump)

	ctx := context.Background()
	in := StartParsing(ctx, strings.NewReader(msg))
	out := demuxer.Start(ctx, in)
	buf := new(bytes.Buffer)
	Consume(ComposePostProcessors(ctx, out, tap, &FilterContextElements{}, &OptimizeColor{}, NewBasicPresenter(buf, true)))

	expectedSrc := Process(1234)
	expectedMod := Module{
		Name:  "libc.so",
		Build: "4fcb712aa6387724a9f465a32cd8c14b",
		Id:    1,
	}
	expectedSeg := Segment{
		Mod:        1,
		Vaddr:      0x12345000,
		Size:       849596,
		Flags:      "rx",
		ModRelAddr: 0x0,
	}
	expectedSink := "llvm-cov"
	expectedName := "test"
	expected := "[123.456] 01234.05678> {{{dumpfile:llvm-cov:test}}}\n"

	actual := buf.String()
	if actual != expected {
		t.Error("expected", expected, "got", actual)
	}
	if tHandler.sinkType != expectedSink {
		t.Error("expected", expectedSink, "got", tHandler.sinkType)
	}
	if tHandler.name != expectedName {
		t.Error("expected", expectedName, "got", tHandler.name)
	}
	if tHandler.src != expectedSrc {
		t.Error("expected", expectedSrc, "got", tHandler.src)
	}
	if tHandler.mod != expectedMod {
		t.Error("expected", expectedMod, "got", tHandler.mod)
	}
	if tHandler.seg != expectedSeg {
		t.Error("expected", expectedSeg, "got", tHandler.seg)
	}
	if tHandler.count == 0 {
		t.Error("trigger handler was not called")
	}
	if tHandler.count > 1 {
		t.Error("trigger handler was called more than once")
	}
}

func TestSyslog(t *testing.T) {
	msg := "[123.456][1234][05678][klog] Blarg\n"
	symbo := newMockSymbolizer([]mockModule{})
	repo := NewRepo()
	demuxer := NewDemuxer(repo, symbo)
	ctx := context.Background()
	in := StartParsing(ctx, strings.NewReader(msg))
	out := demuxer.Start(ctx, in)
	buf := new(bytes.Buffer)
	Consume(ComposePostProcessors(ctx, out, &FilterContextElements{}, &OptimizeColor{}, NewBasicPresenter(buf, true)))
	expected := "[00123.456000][1234][5678][klog] Blarg\n"
	actual := buf.String()
	if actual != expected {
		t.Error("expected", expected, "got", actual)
	}
}

func TestColor(t *testing.T) {
	// TODO(jakehehrlich): Change presenter so that redundent resets are not used when user input already contains them.
	msg := "[0.0] 01234.5678> \033[1mThis is bold \033[31mThis is red and bold \033[37mThis is bold white\n" +
		"[0.0] 1234.05678> This is just normal and has no trailing ANSI code\n" +
		"[0.0] 1234.5678> \033[1m\033[31m this line tests adjacent state changes\n" +
		"[0.0] 01234.5678> \033[1m\033[31m this line will eventully test non-redundent reset \033[1m\n"
	symbo := newMockSymbolizer([]mockModule{})
	repo := NewRepo()
	demuxer := NewDemuxer(repo, symbo)
	ctx := context.Background()
	in := StartParsing(ctx, strings.NewReader(msg))
	out := demuxer.Start(ctx, in)
	buf := new(bytes.Buffer)
	Consume(ComposePostProcessors(ctx, out, &FilterContextElements{}, &OptimizeColor{}, NewBasicPresenter(buf, true)))
	expected := "[0.000] 01234.05678> \033[1mThis is bold \033[31mThis is red and bold \033[37mThis is bold white\033[0m\n" +
		"[0.000] 01234.05678> This is just normal and has no trailing ANSI code\n" +
		"[0.000] 01234.05678> \033[31m\033[1m this line tests adjacent state changes\033[0m\n" +
		"[0.000] 01234.05678> \033[31m\033[1m this line will eventully test non-redundent reset \033[0m\n"
	actual := buf.String()
	if actual != expected {
		t.Errorf("expected %#v got %#v", expected, actual)
	}
}

func ExampleDummyProcess() {
	// mock the input and outputs of llvm-symbolizer
	symbo := newMockSymbolizer([]mockModule{
		{"testdata/libc.elf", map[uint64][]SourceLocation{
			0x429c0: {{NewOptStr("atan2.c"), 33, NewOptStr("atan2")}},
		}},
	})

	// mock ids.txt
	repo := NewRepo()
	repo.AddSource(testBinaries)

	// make a demuxer
	demuxer := NewDemuxer(repo, symbo)

	// define a little message that will need to be parsed
	msg := "{{{module:1:libc.so:elf:4fcb712aa6387724a9f465a32cd8c14b}}}\n" +
		"{{{mmap:0x12345000:849596:load:1:rx:0x0}}}\n" +
		"{{{pc:0x123879c0}}}\n" +
		"blarg[0.0] 0.0> This should be on it's own line\n"

	// start sending InputLines to the demuxer
	ctx := context.Background()
	in := StartParsing(ctx, strings.NewReader(msg))
	// start the demuxer which will cause filters to send output lines to 'out'
	out := demuxer.Start(ctx, in)

	Consume(ComposePostProcessors(ctx, out, &FilterContextElements{}, &OptimizeColor{}, NewBasicPresenter(os.Stdout, false)))

	//Output:
	//atan2 at atan2.c:33
	//blarg
	//[0.000] 00000.00000> This should be on it's own line
}

func ExampleDemux() {
	// mock the input and outputs of llvm-symbolizer
	symbo := newMockSymbolizer([]mockModule{
		{"testdata/libc.elf", map[uint64][]SourceLocation{
			0x429c0: {{NewOptStr("atan2.c"), 49, NewOptStr("atan2")}, {NewOptStr("math.h"), 51, NewOptStr("__DOUBLE_FLOAT")}},
			0x43680: {{NewOptStr("pow.c"), 23, NewOptStr("pow")}},
			0x44987: {{NewOptStr("memcpy.c"), 76, NewOptStr("memcpy")}},
		}},
		{"testdata/libcrypto.elf", map[uint64][]SourceLocation{
			0x81000: {{NewOptStr("rsa.c"), 101, NewOptStr("mod_exp")}},
			0x82000: {{NewOptStr("aes.c"), 17, NewOptStr("gf256_mul")}},
			0x83000: {{NewOptStr("aes.c"), 560, NewOptStr("gf256_div")}},
		}},
	})

	// mock ids.txt
	repo := NewRepo()
	repo.AddSource(testBinaries)

	// make a demuxer
	demuxer := NewDemuxer(repo, symbo)

	// define a little message that will need to be parsed
	msg := "[131.200] 1234.5678> keep {{{module:1:libc.so:elf:4fcb712aa6387724a9f465a32cd8c14b}}}\n" +
		"[131.301] 1234.5678> {{{module:2:libcrypto.so:elf:b4b6c520ccf0aa11ff71d8ded7d6a2bc03037aa1}}} keep\n" +
		"[131.402] 1234.5678> {{{mmap:0x12345000:0xcf6bc:load:1:rx:0x0}}}\n" +
		"[131.503] 1234.5678> {{{mmap:0x23456000:0x83c80:load:2:rx:0x80000}}}\n" +
		"[131.604] 1234.5678> \033[1mError at {{{pc:0x123879c0}}}\n"

	// start sending InputLines to the demuxer
	ctx := context.Background()
	in := StartParsing(ctx, strings.NewReader(msg))
	// start the demuxer which will cause filters to send output lines to 'out'
	out := demuxer.Start(ctx, in)

	Consume(ComposePostProcessors(ctx, out, &FilterContextElements{}, &OptimizeColor{}, NewBasicPresenter(os.Stdout, false)))

	//Output:
	//[131.200] 01234.05678> keep {{{module:4fcb712aa6387724a9f465a32cd8c14b:libc.so:1}}}
	//[131.301] 01234.05678> {{{module:b4b6c520ccf0aa11ff71d8ded7d6a2bc03037aa1:libcrypto.so:2}}} keep
	//[131.604] 01234.05678> Error at atan2 at atan2.c:49
}

func ExampleNewBacktracePresenter() {
	// mock the input and outputs of llvm-symbolizer
	symbo := newMockSymbolizer([]mockModule{
		{"testdata/libc.elf", map[uint64][]SourceLocation{
			0x429c0: {{NewOptStr("atan2.c"), 49, NewOptStr("atan2")}, {NewOptStr("math.h"), 51, NewOptStr("__DOUBLE_FLOAT")}},
			0x43680: {{NewOptStr("pow.c"), 23, NewOptStr("pow")}},
			0x44987: {{NewOptStr("memcpy.c"), 76, NewOptStr("memcpy")}},
		}},
		{"testdata/libcrypto.elf", map[uint64][]SourceLocation{
			0x81000: {{NewOptStr("rsa.c"), 101, NewOptStr("mod_exp")}},
			0x82000: {{NewOptStr("aes.c"), 17, NewOptStr("gf256_mul")}},
			0x83000: {{NewOptStr("aes.c"), 560, NewOptStr("gf256_div")}},
		}},
	})

	// mock ids.txt
	repo := NewRepo()
	repo.AddSource(testBinaries)

	// make a demuxer
	demuxer := NewDemuxer(repo, symbo)

	// define a little message that will need to be parsed
	msg := "[131.200] 1234.5678> {{{module:1:libc.so:elf:4fcb712aa6387724a9f465a32cd8c14b}}}\n" +
		"[131.301] 1234.5678> {{{module:2:libcrypto.so:elf:12ef5c50b3ed3599c07c02d4509311be}}}\n" +
		"[131.301] 1234.5678> {{{module:3:libmissing.no:elf:deadbeef}}}\n" +
		"[131.402] 1234.5678> {{{mmap:0x12345000:0xcf6bc:load:1:rx:0x0}}}\n" +
		"[131.503] 1234.5678> {{{mmap:0x23456000:0x83c80:load:2:rx:0x80000}}}\n" +
		"[131.503] 1234.5678> {{{mmap:0x34567000:0x1000:load:3:rx:0x0}}}\n" +
		"[131.604] 1234.5678> Backtrace:\n" +
		"[131.604] 1234.5678> {{{bt:0:0x12388680}}}\n" +
		"[131.604] 1234.5678> {{{bt:1:0x23457000}}}\n" +
		"[131.604] 1234.5678> {{{bt:2:0x123879c0}}}\n" +
		"[131.705] 1234.5678> {{{bt:3:0x34567042}}}\n"

	// start sending InputLines to the demuxer
	ctx := context.Background()
	in := StartParsing(ctx, strings.NewReader(msg))
	// start the demuxer which will cause filters to send output lines to 'out'
	out := demuxer.Start(ctx, in)

	Consume(ComposePostProcessors(ctx, out,
		&FilterContextElements{},
		NewBacktracePresenter(os.Stdout, NewBasicPresenter(os.Stdout, false))))

	//Output:
	//[131.604] 01234.05678> Backtrace:
	//[131.604] 01234.05678>    #0    0x0000000012388680 in pow pow.c:23 <libc.so>+0x43680
	//[131.604] 01234.05678>    #1    0x0000000023457000 in mod_exp rsa.c:101 <libcrypto.so>+0x81000
	//[131.604] 01234.05678>    #2.1  0x00000000123879c0 in __DOUBLE_FLOAT math.h:51 <libc.so>+0x429c0
	//[131.604] 01234.05678>    #2    0x00000000123879c0 in atan2 atan2.c:49 <libc.so>+0x429c0
	//[131.705] 01234.05678>    #3    0x0000000034567042 in <libmissing.no>+0x42
}

func ExampleBadAddr() {
	// mock the input and outputs of llvm-symbolizer
	symbo := newMockSymbolizer([]mockModule{
		{"testdata/libc.elf", map[uint64][]SourceLocation{
			0x429c0: {{EmptyOptStr(), 0, NewOptStr("atan2")}, {NewOptStr("math.h"), 51, NewOptStr("__DOUBLE_FLOAT")}},
			0x43680: {{NewOptStr("pow.c"), 67, EmptyOptStr()}},
			0x44987: {{NewOptStr("memcpy.c"), 76, NewOptStr("memcpy")}},
		}},
	})

	// mock ids.txt
	repo := NewRepo()
	repo.AddSource(testBinaries)

	// make a demuxer
	demuxer := NewDemuxer(repo, symbo)

	// define a little message that will need to be parsed
	msg := "[131.200] 1234.5678> {{{module:1:libc.so:elf:4fcb712aa6387724a9f465a32cd8c14b}}}\n" +
		"[131.402] 1234.5678> {{{mmap:0x12345000:0xcf6bc:load:1:rx:0x0}}}\n" +
		"[131.604] 1234.5678> {{{pc:0x123879ff}}}\n" +
		"[131.605] 1234.5678> {{{pc:0x123879c0}}}\n" +
		"[131.606] 1234.5678> {{{pc:0x12388680}}}\n"

	// start sending InputLines to the demuxer
	ctx := context.Background()
	in := StartParsing(ctx, strings.NewReader(msg))
	// start the demuxer which will cause filters to send output lines to 'out'
	out := demuxer.Start(ctx, in)

	Consume(ComposePostProcessors(ctx, out, &FilterContextElements{}, &OptimizeColor{}, NewBasicPresenter(os.Stdout, true)))

	//Output:
	//[131.604] 01234.05678> <libc.so>+0x429ff
	//[131.605] 01234.05678> atan2 at <libc.so>+0x429c0
	//[131.606] 01234.05678> pow.c:67
}