package logger

import (
	"io"
	"log"
	"os"

	"github.com/sirupsen/logrus"
)

type Hook struct {
	Writer    io.Writer
	Formatter logrus.Formatter
	Level     []logrus.Level
}

func (h *Hook) Fire(entry *logrus.Entry) error {
	line, err := h.Formatter.Format(entry)
	if err != nil {
		return err
	}
	h.Writer.Write(line)
	return nil
}

func (h *Hook) Levels() []logrus.Level {
	return h.Level
}

func newHook(writer io.Writer, formatter logrus.Formatter, level logrus.Level) *Hook {
	var levels []logrus.Level
	for _, l := range logrus.AllLevels {
		if l <= level {
			levels = append(levels, l)
		}
	}
	return &Hook{
		Writer:    writer,
		Formatter: formatter,
		Level:     levels,
	}
}

func Init(logFilePath string, logLevelStr string) *logrus.Logger {
	var Logger *logrus.Logger
	logLevel, err := logrus.ParseLevel(logLevelStr)
	if err != nil {
		logLevel = logrus.InfoLevel
		log.Printf("Invalid log level: %s. Defaulting to info", logLevelStr)
	}

	Logger = logrus.New()
	Logger.SetOutput(io.Discard)

	logFile, err := os.OpenFile(logFilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
	if err != nil {
		log.Printf("Failed to open log file: %s", logFilePath)
		panic(err)
	}

	Logger.AddHook(newHook(
		logFile,
		&logrus.JSONFormatter{},
		logLevel,
	))

	Logger.AddHook(newHook(
		os.Stderr,
		&logrus.TextFormatter{
			FullTimestamp: true,
			ForceColors:   true,
		},
		logLevel,
	))
	return Logger
}