// Copyright 2019 gf Author(https://github.com/gogf/gf). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.

// Package intlog provides internal logging for GoFrame development usage only.
package intlog

import (
	"fmt"
	"github.com/gogf/gf/debug/gdebug"
	"github.com/gogf/gf/os/gcmd"
	"path/filepath"
	"time"
)

const (
	gFILTER_KEY = "/internal/intlog"
)

var (
	// isGFDebug marks whether printing GoFrame debug information.
	isGFDebug = false
)

func init() {
	// Debugging configured.
	if !gcmd.GetWithEnv("GF_DEBUG").IsEmpty() {
		isGFDebug = true
		return
	}
}

// SetEnabled enables/disables the internal logging manually.
// Note that this function is not concurrent safe, be aware of the DATA RACE.
func SetEnabled(enabled bool) {
	// If they're the same, it does not write the <isGFDebug> but only reading operation.
	if isGFDebug != enabled {
		isGFDebug = enabled
	}
}

// IsEnabled checks and returns whether current process is in GF development.
func IsEnabled() bool {
	return isGFDebug
}

// Print prints <v> with newline using fmt.Println.
// The parameter <v> can be multiple variables.
func Print(v ...interface{}) {
	if !isGFDebug {
		return
	}
	fmt.Println(append([]interface{}{now(), "[INTE]", file()}, v...)...)
}

// Printf prints <v> with format <format> using fmt.Printf.
// The parameter <v> can be multiple variables.
func Printf(format string, v ...interface{}) {
	if !isGFDebug {
		return
	}
	fmt.Printf(now()+" [INTE] "+file()+" "+format+"\n", v...)
}

// Error prints <v> with newline using fmt.Println.
// The parameter <v> can be multiple variables.
func Error(v ...interface{}) {
	if !isGFDebug {
		return
	}
	array := append([]interface{}{now(), "[INTE]", file()}, v...)
	array = append(array, "\n"+gdebug.StackWithFilter(gFILTER_KEY))
	fmt.Println(array...)
}

// Errorf prints <v> with format <format> using fmt.Printf.
func Errorf(format string, v ...interface{}) {
	if !isGFDebug {
		return
	}
	fmt.Printf(
		now()+" [INTE] "+file()+" "+format+"\n%s\n",
		append(v, gdebug.StackWithFilter(gFILTER_KEY))...,
	)
}

// now returns current time string.
func now() string {
	return time.Now().Format("2006-01-02 15:04:05.000")
}

// file returns caller file name along with its line number.
func file() string {
	_, p, l := gdebug.CallerWithFilter(gFILTER_KEY)
	return fmt.Sprintf(`%s:%d`, filepath.Base(p), l)
}