package logger

import (
	"os"

	"github.com/natefinch/lumberjack"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

var (
	log_inst = _NewLogger()

	enable_debug = false
	log_level    = zap.NewAtomicLevel()

	log_file_config = zapcore.AddSync(&lumberjack.Logger{
		Filename:   "services/logger/serverlog.log",
		MaxSize:    500, // megabytes
		MaxBackups: 3,
		MaxAge:     28, //days
		LocalTime:  true,
	})
	json_enc = zapcore.NewJSONEncoder(zapcore.EncoderConfig{
		TimeKey:     "timestamp",
		LevelKey:    "level",
		NameKey:     "logger",
		EncodeLevel: zapcore.LowercaseLevelEncoder,
		EncodeTime:  zapcore.ISO8601TimeEncoder,
	})
	console_enc = zapcore.NewConsoleEncoder(zapcore.EncoderConfig{
		TimeKey:       "timestamp",
		LevelKey:      "level",
		NameKey:       "logger",
		CallerKey:     "caller",
		MessageKey:    "message",
		StacktraceKey: "error",
		EncodeLevel:   zapcore.CapitalColorLevelEncoder,
		EncodeTime:    zapcore.ISO8601TimeEncoder,
	})
)

func createLogggerConfig() *zap.Logger {

	enable_debug_mode := zap.LevelEnablerFunc(func(lvl zapcore.Level) bool {
		return lvl >= zap.InfoLevel || enable_debug
	})

	log_core := zapcore.NewTee(
		zapcore.NewCore(json_enc, log_file_config, enable_debug_mode),
		zapcore.NewCore(console_enc, zapcore.AddSync(os.Stdout), enable_debug_mode),
	)

	return zap.New(log_core)
}

func _NewLogger() *zap.Logger {
	log := createLogggerConfig()
	defer log.Sync()
	return log
}

func GetInstance() *zap.Logger {
	return log_inst
}

func EnableDebug(state bool) {
	enable_debug = state
}