package shared

import (
	"fmt"
	"log"
	"os"
	"os/exec"
	"os/user"
	"strconv"
	"strings"

	"git.nevets.tech/Keys/certman/common"
	"github.com/spf13/cobra"
)

var (
	VersionCmd = basicCmd("version", "Show version", versionCmd)
	NewKeyCmd  = basicCmd("gen-key", "Generates encryption key", newKeyCmd)
	DevCmd     = basicCmd("dev", "Dev Function", devCmd)

	domainCertDir string
	NewDomainCmd  = &cobra.Command{
		Use:           "new-domain",
		Short:         "Create config and directories for new domain",
		Args:          cobra.ExactArgs(1),
		SilenceUsage:  true,
		SilenceErrors: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			dirOverridden := cmd.Flags().Changed("dir")
			return newDomainCmd(args[0], domainCertDir, dirOverridden)
		},
	}

	modeFlag        string
	thinInstallFlag bool
	InstallCmd      = &cobra.Command{
		Use:   "install",
		Short: "Create certman files and directories",
		RunE: func(cmd *cobra.Command, args []string) error {
			switch modeFlag {
			case "server", "client":
				return installCmd(thinInstallFlag, modeFlag)
			default:
				return fmt.Errorf("invalid --mode %q (must be server or client)", modeFlag)
			}
		},
	}
)

func init() {
	NewDomainCmd.Flags().StringVar(&domainCertDir, "dir", "/var/local/certman/certificates/", "Alternate directory for certificates")

	InstallCmd.Flags().StringVar(&modeFlag, "mode", "client", "CertManager mode [server, client]")
	InstallCmd.Flags().BoolVarP(&thinInstallFlag, "thin", "t", false, "Thin install (skip creating dirs)")
}

func devCmd(cmd *cobra.Command, args []string) {
	testDomain := "lunamc.org"
	err := LoadConfig()
	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)
}

func versionCmd(cmd *cobra.Command, args []string) {
	fmt.Printf("CertManager (certman) - Steven Tracey\nVersion: %s build-%s\n",
		common.Version, common.Build,
	)
}

func newKeyCmd(cmd *cobra.Command, args []string) {
	key, err := common.GenerateKey()
	if err != nil {
		log.Fatalf("%v", err)
	}
	fmt.Printf(key)
}

func newDomainCmd(domain, domainDir string, dirOverridden bool) error {
	//TODO add config option for "overridden dir"
	if !common.IsValidFQDN(domain) {
		return fmt.Errorf("invalid FQDN: %q", domain)
	}

	err := LoadConfig()
	if err != nil {
		return err
	}

	fmt.Printf("Creating new domain %s\n", domain)
	err = CreateDomainConfig(domain)
	if err != nil {
		return err
	}
	CreateDomainCertsDir(domain, domainDir, dirOverridden)

	certmanUser, err := user.Lookup("certman")
	if err != nil {
		return fmt.Errorf("error getting user certman: %v", err)
	}
	uid, err := strconv.Atoi(strings.TrimSpace(certmanUser.Uid))
	if err != nil {
		return err
	}
	gid, err := strconv.Atoi(strings.TrimSpace(certmanUser.Gid))
	if err != nil {
		return err
	}
	err = common.ChownRecursive("/etc/certman/domains", uid, gid)
	if err != nil {
		return err
	}
	err = common.ChownRecursive("/var/local/certman", uid, gid)
	if err != nil {
		return err
	}

	fmt.Println("Successfully created domain entry for " + domain + "\nUpdate config file as needed in /etc/certman/domains/" + domain + ".conf\n")
	return nil
}

func installCmd(isThin bool, mode string) error {
	if !isThin {
		if os.Geteuid() != 0 {
			return fmt.Errorf("installation must be run as root")
		}

		MakeDirs()
		CreateConfig(mode)

		err := LoadConfig()
		if err != nil {
			return err
		}

		f, err := os.OpenFile("/var/run/certman.pid", os.O_RDONLY|os.O_CREATE, 0755)
		if err != nil {
			return fmt.Errorf("error creating pid file: %v", err)
		}
		err = f.Close()
		if err != nil {
			return fmt.Errorf("error closing pid file: %v", err)
		}

		newUserCmd := exec.Command("useradd", "-d", "/var/local/certman", "-U", "-r", "-s", "/sbin/nologin", "certman")
		if output, err := newUserCmd.CombinedOutput(); err != nil {
			if !strings.Contains(err.Error(), "exit status 9") {
				return fmt.Errorf("error creating user: %v: output %s", err, output)
			}
		}
		newGroupCmd := exec.Command("groupadd", "-r", "-U", "certman", "certsock")
		if output, err := newGroupCmd.CombinedOutput(); err != nil {
			if !strings.Contains(err.Error(), "exit status 9") {
				return fmt.Errorf("error creating group: %v: output %s", err, output)
			}
		}
		certmanUser, err := user.Lookup("certman")
		if err != nil {
			return fmt.Errorf("error getting user certman: %v", err)
		}
		uid, err := strconv.Atoi(strings.TrimSpace(certmanUser.Uid))
		if err != nil {
			return err
		}
		gid, err := strconv.Atoi(strings.TrimSpace(certmanUser.Gid))
		if err != nil {
			return err
		}
		err = common.ChownRecursive("/etc/certman", uid, gid)
		if err != nil {
			return fmt.Errorf("error changing uid/gid: %v", err)
		}
		err = common.ChownRecursive("/var/local/certman", uid, gid)
		if err != nil {
			return fmt.Errorf("error changing uid/gid: %v", err)
		}
		err = os.Chown("/var/run/certman.pid", uid, gid)
		if err != nil {
			return fmt.Errorf("error changing uid/gid: %v", err)
		}
	} else {
		CreateConfig(mode)
	}
	return nil
}