package main

import (
	"fmt"
	"os"
	"time"
)

// ContainerLogger provides structured logging for containers
// All output goes to stdout/stderr for container runtime collection
type ContainerLogger struct {
	name string
}

// NewContainerLogger creates a new container-friendly logger
func NewContainerLogger(name string) *ContainerLogger {
	return &ContainerLogger{name: name}
}

// Info logs informational messages to stdout
func (l *ContainerLogger) Info(msg string, args ...interface{}) {
	timestamp := time.Now().UTC().Format("2006-01-02T15:04:05.000Z")
	logMsg := fmt.Sprintf(msg, args...)
	fmt.Fprintf(os.Stdout, "[%s] [INFO] [%s] %s\n", timestamp, l.name, logMsg)
}

// Warn logs warning messages to stdout
func (l *ContainerLogger) Warn(msg string, args ...interface{}) {
	timestamp := time.Now().UTC().Format("2006-01-02T15:04:05.000Z")
	logMsg := fmt.Sprintf(msg, args...)
	fmt.Fprintf(os.Stdout, "[%s] [WARN] [%s] %s\n", timestamp, l.name, logMsg)
}

// Error logs error messages to stderr
func (l *ContainerLogger) Error(msg string, args ...interface{}) {
	timestamp := time.Now().UTC().Format("2006-01-02T15:04:05.000Z")
	logMsg := fmt.Sprintf(msg, args...)
	fmt.Fprintf(os.Stderr, "[%s] [ERROR] [%s] %s\n", timestamp, l.name, logMsg)
}

// Debug logs debug messages to stdout (only if DEBUG env var is set)
func (l *ContainerLogger) Debug(msg string, args ...interface{}) {
	if os.Getenv("DEBUG") != "" {
		timestamp := time.Now().UTC().Format("2006-01-02T15:04:05.000Z")
		logMsg := fmt.Sprintf(msg, args...)
		fmt.Fprintf(os.Stdout, "[%s] [DEBUG] [%s] %s\n", timestamp, l.name, logMsg)
	}
}