package main

import (
	"fmt"
	"log"
	"os"
	"runtime"
	"time"
)

var AppLogger = NewCustomLogger()

// CustomLogger wraps the standard logger
type CustomLogger struct {
	logger *log.Logger
}

// NewCustomLogger initializes the custom logger
func NewCustomLogger() *CustomLogger {
	// Create a logger that writes to stdout with no flags
	return &CustomLogger{
		logger: log.New(os.Stdout, "", 0), // we will handle formatting manually
	}
}

// logFormat retrieves the function name, file, and line number
func logFormat() string {
	// Use the runtime.Caller to retrieve caller info
	pc, file, line, ok := runtime.Caller(2)
	if !ok {
		file = "unknown"
		line = 0
	}
	// Get function name
	funcName := runtime.FuncForPC(pc).Name()

	// Format timestamp
	timestamp := time.Now().Format("2006-01-02 15:04:05")

	// Return formatted log prefix (timestamp, file, line, and function name)
	return fmt.Sprintf("%s - %s:%d - %s: ", timestamp, file, line, funcName)
}

// Info logs informational messages
func (c *CustomLogger) Info(msg string) {
	c.logger.Println(logFormat() + "INFO: " + msg)
}

// Error logs error messages
func (c *CustomLogger) Error(msg string) {
	c.logger.Println(logFormat() + "ERROR: " + msg)
}

// Example usage of the custom logger
func showcase() {
	logger := NewCustomLogger()

	logger.Info("This is an info message")
	logger.Error("This is an error message")
}