package fslog

import (
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
	"os"
	"path/filepath"
	"runtime/debug"
	"strings"
)

var logger *zap.Logger

const logDir = "logs"

func init() {
	if !pathExists(logDir) {
		err := os.MkdirAll(logDir, os.ModeDir|os.ModePerm)
		if err != nil {
			panic(err)
		}
	}

	logFilePath := filepath.Join(logDir, "log")
	file, err := os.Create(logFilePath)
	if err != nil {
		panic(err)
	}

	developmentEncoderConfig := zap.NewDevelopmentEncoderConfig()

	encoder := zapcore.NewConsoleEncoder(developmentEncoderConfig)
	core := zapcore.NewTee(
		zapcore.NewCore(encoder, zapcore.AddSync(file), zapcore.DebugLevel),
		zapcore.NewCore(encoder, zapcore.AddSync(os.Stdout), zapcore.DebugLevel),
	)

	logger = zap.New(core, zap.AddCaller())
}

func Info(serviceName string, funcName string, callName string, message string) {
	callerFields := getCallerInfoForLog(serviceName, funcName, callName)
	logger.Info(message, callerFields...)
}

func Error(serviceName string, funcName string, callName string, message string) {
	callerFields := getCallerInfoForLog(serviceName, funcName, callName)
	logger.Error(message+"\n"+string(debug.Stack()), callerFields...)
}

func Debug(serviceName string, funcName string, callName string, message string) {
	callerFields := getCallerInfoForLog(serviceName, funcName, callName)
	logger.Debug(message, callerFields...)
}

func Warning(serviceName string, funcName string, callName string, message string) {
	callerFields := getCallerInfoForLog(serviceName, funcName, callName)
	logger.Warn(message, callerFields...)
}

func getCallerInfoForLog(serviceName string, funcName string, callName string) []zap.Field {
	fields := make([]zap.Field, 0)

	if strings.Trim(serviceName, " ") != "" {
		fields = append(fields, zap.String("service", serviceName))
	}

	if strings.Trim(funcName, " ") != "" {
		fields = append(fields, zap.String("function", funcName))
	}

	if strings.Trim(callName, " ") != "" {
		fields = append(fields, zap.String("call", callName))
	}

	return fields
}

func pathExists(path string) bool {
	_, err := os.Stat(path)
	if err == nil {
		return true
	}

	if os.IsNotExist(err) {
		return false
	}

	return false
}