package log

import (
	"os"

	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

// Logger object is exported to facilitate migration
// to the single logger instance.  Use outside `package log`
// should be avoided.
var post *zap.Logger

// Initialises the logger
func init() {
	var err error
	mode := os.Getenv("runtime")
	if mode == "" {
		mode = "prod"
	}

	logLevel := zapcore.InfoLevel
	if mode == "debug" {
		logLevel = zapcore.DebugLevel
	}

	config := zap.NewDevelopmentConfig()
	config.EncoderConfig.EncodeLevel = zapcore.CapitalColorLevelEncoder
	config.Level = zap.NewAtomicLevelAt(logLevel)
	post, err = config.Build(zap.AddCallerSkip(1))
	if err != nil {
		panic("Failed to initialize logger: " + err.Error())
	}

	defer post.Sync()

	Info("Logger initialised", zap.String("level", logLevel.String()), zap.String("runtime", mode))
}

func Info(msg string, fields ...zap.Field) {
	post.Info(msg, fields...)
}

func Debug(msg string, fields ...zap.Field) {
	post.Debug(msg, fields...)
}

func Warn(msg string, fields ...zap.Field) {
	post.Warn(msg, fields...)
}

func Error(msg string, fields ...zap.Field) {
	post.Error(msg, fields...)
}

func Fatal(msg string, fields ...zap.Field) {
	post.Fatal(msg, fields...)
}

func Panic(msg string, fields ...zap.Field) {
	post.Panic(msg, fields...)
}