package main

import (
	"context"
	"errors"
	"flag"
	"fmt"
	"log"
	"os"
	"os/signal"
	"strings"
	"sync"
	"syscall"
	"time"

	"git.nevets.tech/Steven/ezconf"
)

var version = "1.1.0-beta"
var build = "1"

var config *ezconf.Configuration

var ctx context.Context
var cancel context.CancelFunc
var wg sync.WaitGroup

//TODO create logic for gh vs gt repos

func main() {

	devFlag := flag.Bool("dev", false, "Developer Mode")

	versionFlag := flag.Bool("version", false, "Show version")
	helpFlag := flag.Bool("help", false, "Show help")

	configFile := flag.String("config", "/etc/certman/certman.conf", "Configuration file")

	newDomainFlag := flag.String("new-domain", "example.com", "Domain to create new configs and directories for")
	newDomainDirFlag := flag.String("new-domain-dir", "/opt/certs/example.com", "Directory that certs will be stored in")
	localOnlyFlag := flag.Bool("local-only", false, "Local only")

	installFlag := flag.Bool("install", false, "Install Certman")
	modeFlag := flag.String("mode", "client", "CertManager Mode [server, client]")
	thinInstallFlag := flag.Bool("t", false, "Thin Install (skip creating dirs)")

	newKeyFlag := flag.Bool("newkey", false, "Generate new encryption key")

	reloadFlag := flag.Bool("reload", false, "Reload configs")
	stopFlag := flag.Bool("stop", false, "Stop certman")

	daemonFlag := flag.Bool("d", false, "Daemon Mode")

	flag.Parse()

	if *devFlag {
		testDomain := "lunamc.org"
		var err error
		config, err = ezconf.LoadConfiguration("/etc/certman/certman.conf")
		if err != nil {
			log.Fatalf("Error loading configuration: %v\n", err)
		}
		err = loadDomainConfigs()
		if err != nil {
			log.Fatalf("Error loading configs: %v\n", err)
		}

		fmt.Println(testDomain)

		os.Exit(0)
	}

	if *versionFlag {
		fmt.Println("CertManager (certman) - Steven Tracey\nVersion: " + version + " build-" + build)
		os.Exit(0)
	}

	if *helpFlag {
		fmt.Printf(`CertManager (certman) - Steven Tracey
Version: %s build-%s

Subcommands: certman -subcommand
 - version                  Shows the current version and build
 - help                     Displays this help message
 - newkey                   Creates a new random 256 bit base64 key

Daemon Controls: certman -command
 - d                        Start in daemon mode
 - reload                   Reload configs
 - stop                     Stop Daemon

Installation: certman -install -mode (mode) [-t] [-config /path/to/file]
 - install
   - mode [mode]            Uses the specified config file [server, client]
   - t                      Thin install (skip creating directories)
   - config /path/to/file   Create config file at the specified path

New Domain Options: certman -new-domain example.com [-new-domain-dir /path/to/certs]
 - new-domain               Creates a new domain config
   - new-domain-dir         Specifies directory for new domain certificates to be stored
   - local-only             Don't create git repo

`, version, build)

		os.Exit(0)
	}

	if *newDomainFlag != "example.com" {
		fmt.Printf("Creating new domain %s\n", *newDomainFlag)
		createNewDomainConfig(*newDomainFlag)
		createNewDomainCertsDir(*newDomainFlag, *newDomainDirFlag)
		if !*localOnlyFlag {
			//TODO create git repo
		}
		fmt.Println("Successfully created domain entry for " + *newDomainFlag + "\nUpdate config file as needed in /etc/certman/domains/" + *newDomainFlag + ".conf")
		os.Exit(0)
	}

	if *installFlag {
		if !*thinInstallFlag {
			makeDirs()
		}
		var err error
		config, err = ezconf.NewConfiguration(*configFile, strings.ReplaceAll(defaultConfig, "{mode}", *modeFlag))
		if err != nil {
			log.Fatalf("Error creating config: %s\n", err)
		}
		os.Exit(0)
	}

	if *newKeyFlag {
		key, err := GenerateKey()
		if err != nil {
			log.Fatalf("%v", err)
		}
		fmt.Printf(key)
		os.Exit(0)
	}

	if *reloadFlag {
		proc, err := getDaemonProcess()
		if err != nil {
			log.Fatalf("Error getting daemon process: %v", err)
		}

		err = proc.Signal(syscall.SIGHUP)
		if err != nil {
			log.Fatalf("Error sending SIGHUP to daemon PID: %v\n", err)
		}
		os.Exit(0)
	}

	if *stopFlag {
		proc, err := getDaemonProcess()
		if err != nil {
			log.Fatalf("Error getting daemon process: %v", err)
		}

		err = proc.Signal(syscall.SIGTERM)
		if err != nil {
			log.Fatalf("Error sending SIGTERM to daemon PID: %v\n", err)
		}
		os.Exit(0)
	}

	if *daemonFlag {
		err := createOrUpdatePIDFile("/var/run/certman.pid")
		if err != nil {
			if errors.Is(err, ErrorPIDInUse) {
				log.Fatalf("Deemon process is already running\n")
			}
			log.Fatalf("Error creating pidfile: %v\n", err)
		}

		ctx, cancel = context.WithCancel(context.Background())

		// Check if main config exists
		if _, err := os.Stat(*configFile); os.IsNotExist(err) {
			log.Fatalf("Main config file not found, please run 'certman --install', then properly configure /etc/certman/certman.conf.")
		} else if err != nil {
			fmt.Printf("Error opening %s: %v\n", *configFile, err)
		}
		config, err = ezconf.LoadConfiguration(*configFile)
		if err != nil {
			log.Fatalf("Error loading configuration: %v\n", err)
		}

		// Setup SIGINT and SIGTERM listeners
		sigChannel := make(chan os.Signal, 1)
		signal.Notify(sigChannel, syscall.SIGINT, syscall.SIGTERM)
		defer signal.Stop(sigChannel)

		reloadSigChan := make(chan os.Signal, 1)
		signal.Notify(reloadSigChan, syscall.SIGHUP)
		defer signal.Stop(reloadSigChan)

		ticker := time.NewTicker(30 * time.Second)
		defer ticker.Stop()

		wg.Add(1)
		if config.GetAsString("App.mode") == "server" {
			fmt.Println("Starting CertManager in server mode...")
			// Server Task loop
			go func() {
				initServer()
				defer wg.Done()
				for {
					select {
					case <-ctx.Done():
						stopServer()
						return
					case <-reloadSigChan:
						reloadServer()
					case <-ticker.C:
						serverTick()
					}
				}
			}()
		} else if config.GetAsString("App.mode") == "client" {
			fmt.Println("Starting CertManager in client mode...")
			// Client Task loop
			go func() {
				initClient()
				defer wg.Done()
				for {
					select {
					case <-ctx.Done():
						stopClient()
						return
					case <-reloadSigChan:
						reloadClient()
					case <-ticker.C:
						clientTick()
					}
				}
			}()
		} else {
			fmt.Println("Invalid operating mode \"" + config.GetAsString("App.mode") + "\"")
		}

		// Cleanup on stop
		sig := <-sigChannel
		fmt.Printf("Program terminated with %v\n", sig)

		stop()
		wg.Wait()
	}
}

func stop() {
	cancel()
	clearPIDFile()
}

//var legoBaseArgs []string
//
//func maindis() {
//	config, err := ezconf.NewConfiguration("/etc/certman/certman.conf", "")
//	var domain string
//	if err != nil {
//		log.Fatalf("Error loading configuration: %v\n", err)
//	}
//
//	args := os.Args
//
//	// -d
//	hasDomain, domainIndex := contains(args, "-d")
//	if hasDomain {
//		domain = args[domainIndex+1]
//	} else {
//		log.Fatalf("Error, no domain passed. Please add '-d domain.tld' to the command\n")
//	}
//
//	hasDns, dnsIndex := contains(args, "--dns")
//
//	legoBaseArgs = []string{
//		"-a",
//		"--dns",
//		"cloudflare",
//		"--email=" + config.GetAsString("Cloudflare.cf_email"),
//		"--domains=" + domain,
//		"--domains=*." + domain,
//		"--path=" + config.GetAsString("Certificates.certs_path"),
//	}
//	legoNewSiteArgs := append(legoBaseArgs, "run")
//	legoRenewSiteArgs := append(legoBaseArgs, "renew", "--days", "90")
//
//	subdomains := config.GetAsStrings("Certificates.subdomains")
//	if subdomains != nil {
//		for i, subdomain := range subdomains {
//			legoBaseArgs = insert(legoBaseArgs, 5+i, "--domains=*."+subdomain+"."+domain)
//		}
//	}
//
//	if hasDns {
//		legoBaseArgs = insert(legoBaseArgs, 3, "--dns.resolvers="+args[dnsIndex+1])
//	}
//
//	giteaClient = createGiteaClient()
//	gitWorkspace := &GitWorkspace{
//		Storage: memory.NewStorage(),
//		FS:      memfs.New(),
//	}
//
//	var cmd *exec.Cmd
//	switch args[len(args)-1] {
//	case "gen":
//		{
//			url := createGiteaRepo(domain)
//			if url == "" {
//				return
//			}
//			gitWorkspace.Repo, gitWorkspace.WorkTree = cloneRepo(url, gitWorkspace)
//			if gitWorkspace.Repo == nil {
//				return
//			}
//			cmd = exec.Command("lego", legoNewSiteArgs...)
//		}
//	case "renew":
//		{
//			gitWorkspace.Repo, gitWorkspace.WorkTree = cloneRepo(config.GetAsString("Git.server")+"/"+config.GetAsString("Git.org_name")+"/"+domain+"-certificates.git", gitWorkspace)
//			if gitWorkspace.Repo == nil {
//				return
//			}
//			cmd = exec.Command("lego", legoRenewSiteArgs...)
//		}
//	case "gen-cert-only":
//		{
//			cmd = exec.Command("lego", legoNewSiteArgs...)
//		}
//	case "renew-cert-only":
//		{
//			cmd = exec.Command("lego", legoRenewSiteArgs...)
//		}
//	case "git":
//		{
//			url := createGiteaRepo(domain)
//			if url == "" {
//				return
//			}
//			gitWorkspace.Repo, gitWorkspace.WorkTree = cloneRepo(url, gitWorkspace)
//			if gitWorkspace.Repo == nil {
//				return
//			}
//			err := addAndPushCerts(domain, gitWorkspace)
//			if err != nil {
//				return
//			}
//			os.Exit(0)
//		}
//	default:
//		{
//			fmt.Println("Missing arguments: conclude command with 'gen' or 'renew'")
//			os.Exit(1)
//		}
//	}
//	cmd.Env = append(cmd.Environ(),
//		"CLOUDFLARE_DNS_API_TOKEN="+config.GetAsString("Cloudflare.cf_api_token"),
//		"CLOUDFLARE_ZONE_API_TOKEN"+config.GetAsString("Cloudflare.cf_api_token"),
//		"CLOUDFLARE_EMAIL="+config.GetAsString("Cloudflare.cf_email"),
//	)
//	stdout, err := cmd.StdoutPipe()
//	if err != nil {
//		fmt.Printf("Error getting stdout from lego process: %v\n", err)
//		os.Exit(1)
//	}
//	err = cmd.Start()
//	if err != nil {
//		fmt.Printf("Error creating certs with lego: %v\n", err)
//		os.Exit(1)
//	}
//	scanner := bufio.NewScanner(stdout)
//	go func() {
//		for scanner.Scan() {
//			fmt.Println(scanner.Text())
//		}
//		if err := scanner.Err(); err != nil {
//			fmt.Fprintln(os.Stderr, "reading standard input:", err)
//		}
//	}()
//	err = cmd.Wait()
//	if err != nil {
//		fmt.Printf("Error waiting for lego command to finish: %v\n", err)
//		os.Exit(1)
//	}
//	err = addAndPushCerts(domain, gitWorkspace)
//	if err != nil {
//		fmt.Printf("Error adding and pushing certs: %v\n", err)
//		return
//	}
//}