// Copyright 2009 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 log

// These tests are too simple.

import (
	"bufio"
	"os"
	"regexp"
	"testing"
)

const (
	Rdate         = `[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9]`
	Rtime         = `[0-9][0-9]:[0-9][0-9]:[0-9][0-9]`
	Rmicroseconds = `\.[0-9][0-9][0-9][0-9][0-9][0-9]`
	Rline         = `[0-9]+:`
	Rlongfile     = `.*/[A-Za-z0-9_\-]+\.go:` + Rline
	Rshortfile    = `[A-Za-z0-9_\-]+\.go:` + Rline
)

type tester struct {
	flag    int
	prefix  string
	pattern string // regexp that log output must match; we add ^ and expected_text$ always
}

var tests = []tester{
	// individual pieces:
	tester{0, "", ""},
	tester{0, "XXX", "XXX"},
	tester{Lok | Ldate, "", Rdate + " "},
	tester{Lok | Ltime, "", Rtime + " "},
	tester{Lok | Ltime | Lmicroseconds, "", Rtime + Rmicroseconds + " "},
	tester{Lok | Lmicroseconds, "", Rtime + Rmicroseconds + " "}, // microsec implies time
	tester{Lok | Llongfile, "", Rlongfile + " "},
	tester{Lok | Lshortfile, "", Rshortfile + " "},
	tester{Lok | Llongfile | Lshortfile, "", Rshortfile + " "}, // shortfile overrides longfile
	// everything at once:
	tester{Lok | Ldate | Ltime | Lmicroseconds | Llongfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rlongfile + " "},
	tester{Lok | Ldate | Ltime | Lmicroseconds | Lshortfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rshortfile + " "},
}

// Test using Log("hello", 23, "world") or using Logf("hello %d world", 23)
func testLog(t *testing.T, flag int, prefix string, pattern string, useLogf bool) {
	r, w, err1 := os.Pipe()
	if err1 != nil {
		t.Fatal("pipe", err1)
	}
	defer r.Close()
	defer w.Close()
	buf := bufio.NewReader(r)
	l := New(w, nil, prefix, flag)
	if useLogf {
		l.Logf("hello %d world", 23)
	} else {
		l.Log("hello", 23, "world")
	}
	line, err3 := buf.ReadString('\n')
	if err3 != nil {
		t.Fatal("log error", err3)
	}
	line = line[0 : len(line)-1]
	pattern = "^" + pattern + "hello 23 world$"
	matched, err4 := regexp.MatchString(pattern, line)
	if err4 != nil {
		t.Fatal("pattern did not compile:", err4)
	}
	if !matched {
		t.Errorf("log output should match %q is %q", pattern, line)
	}
}

func TestAllLog(t *testing.T) {
	for _, testcase := range tests {
		testLog(t, testcase.flag, testcase.prefix, testcase.pattern, false)
		testLog(t, testcase.flag, testcase.prefix, testcase.pattern, true)
	}
}