package main

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

func defaultConfigPath() string {
	home, err := os.UserHomeDir()
	if err != nil {
		home = "."
	}
	return filepath.Join(home, ".config", "qbhardlink", "config.yaml")
}

func defaultLogPath() string {
	home, err := os.UserHomeDir()
	if err != nil {
		home = "."
	}
	return filepath.Join(home, ".config", "qbhardlink", "qbhardlink.log")
}

func setupLogger(logPath string) (*os.File, error) {
	if err := os.MkdirAll(filepath.Dir(logPath), 0755); err != nil {
		return nil, err
	}
	f, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		return nil, err
	}
	log.SetOutput(f)
	return f, nil
}

func main() {
	log.SetFlags(log.Ldate | log.Ltime)

	var (
		name        = flag.String("name", "", "Torrent name (%N)")
		category    = flag.String("category", "", "Torrent category (%L) [required]")
		contentPath = flag.String("content-path", "", "Content path (%F) [required]")
		configPath  = flag.String("config", defaultConfigPath(), "Path to config YAML file")
		logPath     = flag.String("log", defaultLogPath(), "Path to log file (empty to disable)")
	)
	flag.Parse()

	if *category == "" || *contentPath == "" {
		fmt.Fprintln(os.Stderr, "Usage: qbhardlink --category <cat> --content-path <path> [--name <name>] [--config <path>] [--log <path>]")
		fmt.Fprintln(os.Stderr, "")
		fmt.Fprintln(os.Stderr, "qBittorrent run-on-finish example:")
		os.Stderr.WriteString("  /usr/local/bin/qbhardlink --name \"%N\" --category \"%L\" --content-path \"%F\"\n")
		os.Exit(1)
	}

	if *logPath != "" {
		f, err := setupLogger(*logPath)
		if err != nil {
			log.Printf("warning: could not open log file %q: %v (logging to stderr)", *logPath, err)
		} else {
			defer f.Close()
		}
	}

	log.Printf("--- start ---")
	log.Printf("name=%q category=%q content-path=%q", *name, *category, *contentPath)
	log.Printf("config=%q", *configPath)

	cfg, err := loadConfig(*configPath)
	if err != nil {
		log.Fatalf("config: %v", err)
	}

	destSubdir, ok := cfg.Categories[*category]
	if !ok {
		log.Printf("category %q not in config, nothing to do", *category)
		os.Exit(0)
	}

	log.Printf("category %q -> dest subdir %q", *category, destSubdir)

	if err := processHardlinks(cfg, *contentPath, destSubdir); err != nil {
		log.Fatalf("error: %v", err)
	}

	log.Printf("done")
}