//go:build debug

package main

import (
	"fmt"
	"log"
	"os"
	"path/filepath"
	"time"
)

var debugLogger *log.Logger

func init() {
	home, _ := os.UserHomeDir()
	logDir := filepath.Join(home, "former")
	os.MkdirAll(logDir, 0755)
	logPath := filepath.Join(logDir, "debug.log")

	f, err := os.OpenFile(logPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
	if err != nil {
		// Fall back to stderr
		debugLogger = log.New(os.Stderr, "[DEBUG] ", log.Ltime|log.Lshortfile)
		debugLogger.Printf("Could not open %s: %v — logging to stderr", logPath, err)
		return
	}

	debugLogger = log.New(f, "[DEBUG] ", log.Ltime|log.Lshortfile)
	debugLogger.Printf("=== Former debug session started %s ===", time.Now().Format(time.RFC3339))
	debugLogger.Printf("Log file: %s", logPath)
	fmt.Fprintf(os.Stderr, "[Former] Debug logging to %s\n", logPath)
}

func debugLog(format string, args ...interface{}) {
	if debugLogger != nil {
		debugLogger.Printf(format, args...)
	}
}