// Copyright 2020 Kentaro Hibino. All rights reserved.
// Use of this source code is governed by a MIT license
// that can be found in the LICENSE file.

package log

import (
	"bytes"
	"fmt"
	"regexp"
	"testing"
)

// regexp for timestamps
const (
	rgxPID          = `[0-9]+`
	rgxdate         = `[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9]`
	rgxtime         = `[0-9][0-9]:[0-9][0-9]:[0-9][0-9]`
	rgxmicroseconds = `\.[0-9][0-9][0-9][0-9][0-9][0-9]`
)

type tester struct {
	desc        string
	message     string
	wantPattern string // regexp that log output must match
}

func TestLoggerDebug(t *testing.T) {
	tests := []tester{
		{
			desc:    "without trailing newline, logger adds newline",
			message: "hello, world!",
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s DEBUG: hello, world!\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
		{
			desc:    "with trailing newline, logger preserves newline",
			message: "hello, world!\n",
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s DEBUG: hello, world!\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
	}

	for _, tc := range tests {
		var buf bytes.Buffer
		logger := NewLogger(newBase(&buf))

		logger.Debug(tc.message)

		got := buf.String()
		matched, err := regexp.MatchString(tc.wantPattern, got)
		if err != nil {
			t.Fatal("pattern did not compile:", err)
		}
		if !matched {
			t.Errorf("logger.Debug(%q) outputted %q, should match pattern %q",
				tc.message, got, tc.wantPattern)
		}
	}
}

func TestLoggerInfo(t *testing.T) {
	tests := []tester{
		{
			desc:    "without trailing newline, logger adds newline",
			message: "hello, world!",
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s INFO: hello, world!\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
		{
			desc:    "with trailing newline, logger preserves newline",
			message: "hello, world!\n",
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s INFO: hello, world!\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
	}

	for _, tc := range tests {
		var buf bytes.Buffer
		logger := NewLogger(newBase(&buf))

		logger.Info(tc.message)

		got := buf.String()
		matched, err := regexp.MatchString(tc.wantPattern, got)
		if err != nil {
			t.Fatal("pattern did not compile:", err)
		}
		if !matched {
			t.Errorf("logger.Info(%q) outputted %q, should match pattern %q",
				tc.message, got, tc.wantPattern)
		}
	}
}

func TestLoggerWarn(t *testing.T) {
	tests := []tester{
		{
			desc:    "without trailing newline, logger adds newline",
			message: "hello, world!",
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s WARN: hello, world!\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
		{
			desc:    "with trailing newline, logger preserves newline",
			message: "hello, world!\n",
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s WARN: hello, world!\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
	}

	for _, tc := range tests {
		var buf bytes.Buffer
		logger := NewLogger(newBase(&buf))

		logger.Warn(tc.message)

		got := buf.String()
		matched, err := regexp.MatchString(tc.wantPattern, got)
		if err != nil {
			t.Fatal("pattern did not compile:", err)
		}
		if !matched {
			t.Errorf("logger.Warn(%q) outputted %q, should match pattern %q",
				tc.message, got, tc.wantPattern)
		}
	}
}

func TestLoggerError(t *testing.T) {
	tests := []tester{
		{
			desc:    "without trailing newline, logger adds newline",
			message: "hello, world!",
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s ERROR: hello, world!\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
		{
			desc:    "with trailing newline, logger preserves newline",
			message: "hello, world!\n",
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s ERROR: hello, world!\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
	}

	for _, tc := range tests {
		var buf bytes.Buffer
		logger := NewLogger(newBase(&buf))

		logger.Error(tc.message)

		got := buf.String()
		matched, err := regexp.MatchString(tc.wantPattern, got)
		if err != nil {
			t.Fatal("pattern did not compile:", err)
		}
		if !matched {
			t.Errorf("logger.Error(%q) outputted %q, should match pattern %q",
				tc.message, got, tc.wantPattern)
		}
	}
}

type formatTester struct {
	desc        string
	format      string
	args        []interface{}
	wantPattern string // regexp that log output must match
}

func TestLoggerDebugf(t *testing.T) {
	tests := []formatTester{
		{
			desc:   "Formats message with DEBUG prefix",
			format: "hello, %s!",
			args:   []interface{}{"Gopher"},
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s DEBUG: hello, Gopher!\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
	}

	for _, tc := range tests {
		var buf bytes.Buffer
		logger := NewLogger(newBase(&buf))

		logger.Debugf(tc.format, tc.args...)

		got := buf.String()
		matched, err := regexp.MatchString(tc.wantPattern, got)
		if err != nil {
			t.Fatal("pattern did not compile:", err)
		}
		if !matched {
			t.Errorf("logger.Debugf(%q, %v) outputted %q, should match pattern %q",
				tc.format, tc.args, got, tc.wantPattern)
		}
	}
}

func TestLoggerInfof(t *testing.T) {
	tests := []formatTester{
		{
			desc:   "Formats message with INFO prefix",
			format: "%d,%d,%d",
			args:   []interface{}{1, 2, 3},
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s INFO: 1,2,3\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
	}

	for _, tc := range tests {
		var buf bytes.Buffer
		logger := NewLogger(newBase(&buf))

		logger.Infof(tc.format, tc.args...)

		got := buf.String()
		matched, err := regexp.MatchString(tc.wantPattern, got)
		if err != nil {
			t.Fatal("pattern did not compile:", err)
		}
		if !matched {
			t.Errorf("logger.Infof(%q, %v) outputted %q, should match pattern %q",
				tc.format, tc.args, got, tc.wantPattern)
		}
	}
}

func TestLoggerWarnf(t *testing.T) {
	tests := []formatTester{
		{
			desc:   "Formats message with WARN prefix",
			format: "hello, %s",
			args:   []interface{}{"Gophers"},
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s WARN: hello, Gophers\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
	}

	for _, tc := range tests {
		var buf bytes.Buffer
		logger := NewLogger(newBase(&buf))

		logger.Warnf(tc.format, tc.args...)

		got := buf.String()
		matched, err := regexp.MatchString(tc.wantPattern, got)
		if err != nil {
			t.Fatal("pattern did not compile:", err)
		}
		if !matched {
			t.Errorf("logger.Warnf(%q, %v) outputted %q, should match pattern %q",
				tc.format, tc.args, got, tc.wantPattern)
		}
	}
}

func TestLoggerErrorf(t *testing.T) {
	tests := []formatTester{
		{
			desc:   "Formats message with ERROR prefix",
			format: "hello, %s",
			args:   []interface{}{"Gophers"},
			wantPattern: fmt.Sprintf("^asynq: pid=%s %s %s%s ERROR: hello, Gophers\n$",
				rgxPID, rgxdate, rgxtime, rgxmicroseconds),
		},
	}

	for _, tc := range tests {
		var buf bytes.Buffer
		logger := NewLogger(newBase(&buf))

		logger.Errorf(tc.format, tc.args...)

		got := buf.String()
		matched, err := regexp.MatchString(tc.wantPattern, got)
		if err != nil {
			t.Fatal("pattern did not compile:", err)
		}
		if !matched {
			t.Errorf("logger.Errorf(%q, %v) outputted %q, should match pattern %q",
				tc.format, tc.args, got, tc.wantPattern)
		}
	}
}