// Copyright 2011 The Go 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 build

import (
	"io"
	"os"
	"path/filepath"
	"reflect"
	"runtime"
	"strings"
	"testing"
)

func TestMatch(t *testing.T) {
	ctxt := Default
	what := "default"
	match := func(tag string, want map[string]bool) {
		m := make(map[string]bool)
		if !ctxt.match(tag, m) {
			t.Errorf("%s context should match %s, does not", what, tag)
		}
		if !reflect.DeepEqual(m, want) {
			t.Errorf("%s tags = %v, want %v", tag, m, want)
		}
	}
	nomatch := func(tag string, want map[string]bool) {
		m := make(map[string]bool)
		if ctxt.match(tag, m) {
			t.Errorf("%s context should NOT match %s, does", what, tag)
		}
		if !reflect.DeepEqual(m, want) {
			t.Errorf("%s tags = %v, want %v", tag, m, want)
		}
	}

	match(runtime.GOOS+","+runtime.GOARCH, map[string]bool{runtime.GOOS: true, runtime.GOARCH: true})
	match(runtime.GOOS+","+runtime.GOARCH+",!foo", map[string]bool{runtime.GOOS: true, runtime.GOARCH: true, "foo": true})
	nomatch(runtime.GOOS+","+runtime.GOARCH+",foo", map[string]bool{runtime.GOOS: true, runtime.GOARCH: true, "foo": true})

	what = "modified"
	ctxt.BuildTags = []string{"foo"}
	match(runtime.GOOS+","+runtime.GOARCH, map[string]bool{runtime.GOOS: true, runtime.GOARCH: true})
	match(runtime.GOOS+","+runtime.GOARCH+",foo", map[string]bool{runtime.GOOS: true, runtime.GOARCH: true, "foo": true})
	nomatch(runtime.GOOS+","+runtime.GOARCH+",!foo", map[string]bool{runtime.GOOS: true, runtime.GOARCH: true, "foo": true})
	match(runtime.GOOS+","+runtime.GOARCH+",!bar", map[string]bool{runtime.GOOS: true, runtime.GOARCH: true, "bar": true})
	nomatch(runtime.GOOS+","+runtime.GOARCH+",bar", map[string]bool{runtime.GOOS: true, runtime.GOARCH: true, "bar": true})
	nomatch("!", map[string]bool{})
}

func TestDotSlashImport(t *testing.T) {
	p, err := ImportDir("testdata/other", 0)
	if err != nil {
		t.Fatal(err)
	}
	if len(p.Imports) != 1 || p.Imports[0] != "./file" {
		t.Fatalf("testdata/other: Imports=%v, want [./file]", p.Imports)
	}

	p1, err := Import("./file", "testdata/other", 0)
	if err != nil {
		t.Fatal(err)
	}
	if p1.Name != "file" {
		t.Fatalf("./file: Name=%q, want %q", p1.Name, "file")
	}
	dir := filepath.Clean("testdata/other/file") // Clean to use \ on Windows
	if p1.Dir != dir {
		t.Fatalf("./file: Dir=%q, want %q", p1.Name, dir)
	}
}

func TestEmptyImport(t *testing.T) {
	p, err := Import("", Default.GOROOT, FindOnly)
	if err == nil {
		t.Fatal(`Import("") returned nil error.`)
	}
	if p == nil {
		t.Fatal(`Import("") returned nil package.`)
	}
	if p.ImportPath != "" {
		t.Fatalf("ImportPath=%q, want %q.", p.ImportPath, "")
	}
}

func TestLocalDirectory(t *testing.T) {
	cwd, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}

	p, err := ImportDir(cwd, 0)
	if err != nil {
		t.Fatal(err)
	}
	if p.ImportPath != "go/build" {
		t.Fatalf("ImportPath=%q, want %q", p.ImportPath, "go/build")
	}
}

func TestShouldBuild(t *testing.T) {
	const file1 = "// +build tag1\n\n" +
		"package main\n"
	want1 := map[string]bool{"tag1": true}

	const file2 = "// +build cgo\n\n" +
		"// This package implements parsing of tags like\n" +
		"// +build tag1\n" +
		"package build"
	want2 := map[string]bool{"cgo": true}

	const file3 = "// Copyright The Go Authors.\n\n" +
		"package build\n\n" +
		"// shouldBuild checks tags given by lines of the form\n" +
		"// +build tag\n" +
		"func shouldBuild(content []byte)\n"
	want3 := map[string]bool{}

	ctx := &Context{BuildTags: []string{"tag1"}}
	m := map[string]bool{}
	if !ctx.shouldBuild([]byte(file1), m) {
		t.Errorf("shouldBuild(file1) = false, want true")
	}
	if !reflect.DeepEqual(m, want1) {
		t.Errorf("shoudBuild(file1) tags = %v, want %v", m, want1)
	}

	m = map[string]bool{}
	if ctx.shouldBuild([]byte(file2), m) {
		t.Errorf("shouldBuild(file2) = true, want fakse")
	}
	if !reflect.DeepEqual(m, want2) {
		t.Errorf("shoudBuild(file2) tags = %v, want %v", m, want2)
	}

	m = map[string]bool{}
	ctx = &Context{BuildTags: nil}
	if !ctx.shouldBuild([]byte(file3), m) {
		t.Errorf("shouldBuild(file3) = false, want true")
	}
	if !reflect.DeepEqual(m, want3) {
		t.Errorf("shoudBuild(file3) tags = %v, want %v", m, want3)
	}
}

type readNopCloser struct {
	io.Reader
}

func (r readNopCloser) Close() error {
	return nil
}

var matchFileTests = []struct {
	name  string
	data  string
	match bool
}{
	{"foo_arm.go", "", true},
	{"foo1_arm.go", "// +build linux\n\npackage main\n", false},
	{"foo_darwin.go", "", false},
	{"foo.go", "", true},
	{"foo1.go", "// +build linux\n\npackage main\n", false},
	{"foo.badsuffix", "", false},
}

func TestMatchFile(t *testing.T) {
	for _, tt := range matchFileTests {
		ctxt := Context{GOARCH: "arm", GOOS: "plan9"}
		ctxt.OpenFile = func(path string) (r io.ReadCloser, err error) {
			if path != "x+"+tt.name {
				t.Fatalf("OpenFile asked for %q, expected %q", path, "x+"+tt.name)
			}
			return &readNopCloser{strings.NewReader(tt.data)}, nil
		}
		ctxt.JoinPath = func(elem ...string) string {
			return strings.Join(elem, "+")
		}
		match, err := ctxt.MatchFile("x", tt.name)
		if match != tt.match || err != nil {
			t.Fatalf("MatchFile(%q) = %v, %v, want %v, nil", tt.name, match, err, tt.match)
		}
	}
}
