package logger

import (
	"fmt"
	"io"
	"log"
	"os"
	"strings"
	"time"

	"github.com/spf13/viper"
)

const (
	verbose = 1 << iota
	info
	error
	debug
)

func getLogger(level int, prefix string) *log.Logger {
	var output io.Writer

	if level == error {
		output = os.Stderr
	} else {
		output = os.Stdout
	}

	// TODO: get from config
	configLevel := debug

	if configLevel < level {
		output = io.Discard
	}

	prefix = fmt.Sprintf("%-*s", 6, prefix)

	logger := log.New(output, prefix, log.Ldate|log.Ltime|log.Lmicroseconds|log.Lmsgprefix)

	return logger
}

func logMessage(level string, message string) {
	currentLevel := viper.GetString("log_level")

	levels := map[string]int{
		"verbose": 1,
		"info":    2,
		"error":   3,
		"debug":   4,
	}

	if levels[currentLevel] <= levels[level] {
		timestamp := time.Now().Format("2006-01-02 15:04:05")
		prefix := strings.ToUpper(level)
		fmt.Printf("%-7s %s %s\n", prefix, timestamp, message)
	}
}

func Verbose(message string) {
	logger := getLogger(verbose, "VERB")
	logger.Println(message)
}

func Info(message string, args ...any) {
	logger := getLogger(info, "INFO")
	msg := fmt.Sprintf(message, args...)
	logger.Println(msg)
}

func Error(message string, args ...any) {
	logger := getLogger(error, "ERROR")
	msg := fmt.Sprintf(message, args...)
	logger.Println(msg)
}

func Debug(message string, args ...any) {
	logger := getLogger(debug, "DEBUG")
	msg := fmt.Sprintf(message, args...)
	logger.Println(msg)
}

func Fatal(message string, args ...any) {
	logger := getLogger(error, "FATAL")
	msg := fmt.Sprintf(message, args...)
	logger.Fatalln(msg)
}