package cmd

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"
	"strconv"
	"strings"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	// TODO : Use log
	//log "github.com/sirupsen/logrus"
)

const (
	gVersion = "0.27c"
)

var (
	gJails []Jail

	gUseSudo bool

	gConfigFile     string
	gDisplayColumns string
	gFilterJails    string
	gSortFields     string
	gNoLineSep      bool

	gHostVersion float64

	gTimeZone     string
	gSnapshotName string

	gMigrateDestPool string

	rootCmd = &cobra.Command{
		Use:   "gocage",
		Short: "GoCage is a FreeBSD Jail management tool",
		Long: `GoCage is a jail management tool. It support VNET, host-only, NAT networks. Provides snapshots and cloning.
It support iocage jails and can coexist with iocage.`,
		Run: func(cmd *cobra.Command, args []string) {
			fmt.Printf("GoCage v.%s on FreeBSD %.1f\n", gVersion, gHostVersion)
			fmt.Printf("Use -h flag to display help\n")
		},
	}

	versionCmd = &cobra.Command{
		Use:   "version",
		Short: "Print the version number of GoCage",
		Long:  `Let this show you how much fail I had to get this *cough* perfect`,
		Run: func(cmd *cobra.Command, args []string) {
			fmt.Printf("GoCage v.%s on FreeBSD %.1f\n", gVersion, gHostVersion)
		},
	}

	listCmd = &cobra.Command{
		Use:   "list",
		Short: "Print jails",
		Long: `Display jails, their IP and OS.
Jail list can be restricted by adding name on command line
ex: gocage list srv-db srv-web`,
		Run: func(cmd *cobra.Command, args []string) {
			ListJails(args, true)
		},
	}

	listPropsCmd = &cobra.Command{
		Use:   "properties",
		Short: "Print jails properties",
		Long:  "Display jails properties. You can use properties to filter, get or set them.",
		Run: func(cmd *cobra.Command, args []string) {
			ListJailsProps(args)
		},
	}

	stopCmd = &cobra.Command{
		Use:   "stop",
		Short: "stop jail",
		Long:  "shutdown jail",
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			StopJail(args)
		},
	}

	startCmd = &cobra.Command{
		Use:   "start",
		Short: "start jail",
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			StartJail(args)
			WriteConfigToDisk(false)
		},
	}

	/*	shellCmd = &cobra.Command {
			Use:   "console",
			Short: "Execute shell on jail",
			Run: func(cmd *cobra.Command, args []string) {
				// Load inventory
				ListJails(args, false)
				ShellJail(args)
			},
		}
	*/
	setCmd = &cobra.Command{
		Use:   "set",
		Short: "Set a jail property",
		Long: `Set jail property value. Specify property=value, end command with jail name.
Multiples properties can be specified, separated with space (Ex: gocage set allow_mlock=1 boot=1 myjail)`,
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			SetJailProperties(args)
			WriteConfigToDisk(true)
		},
	}

	getCmd = &cobra.Command{
		Use:   "get",
		Short: "Get a jail property",
		Long: `Get jail property value. Specify property, end command with jail name.
Multiples properties can be specified, separated with space (Ex: gocage get allow_mlock boot myjail)
For all properties specify "all" (Ex: gocage get all myjail)`,
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			GetJailProperties(args)
		},
	}

	snapshotCmd = &cobra.Command{
		Use:   "snapshot",
		Short: "snapshot jail",
		Long:  "Commands to manage jail snapshots. If no arguments given, ",
		Run: func(cmd *cobra.Command, args []string) {

		},
	}

	snapshotListCmd = &cobra.Command{
		Use:   "list",
		Short: "list snapshots",
		Long: `List snapshots of a jail by specifying its name. 
List all snapshots if no jail name specified.
You can specify multiple jails.`,
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			ListJailsSnapshots(args)
		},
	}

	snapshotCreateCmd = &cobra.Command{
		Use:   "create",
		Short: "create snapshots",
		Long:  `Create snapshot of a jail by specifying snapshot name and jail name.`,
		//		You can specify multiple jails.`,
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			CreateJailSnapshot(args)
		},
	}

	snapshotRollbackCmd = &cobra.Command{
		Use:   "rollback",
		Short: "Rollback snapshots",
		Long:  `Rollback jail to specifyed snapshot.`,
		//		You can specify multiple jails.`,
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			RollbackJailSnapshot(args)
		},
	}

	snapshotDeleteCmd = &cobra.Command{
		Use:   "destroy",
		Short: "destroy snapshots",
		Long:  `Destroy snapshot of a jail by specifying snapshot name and jail name.`,
		//		You can specify multiple jails.`,
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			DeleteJailSnapshot(args)
		},
	}

	migrateCmd = &cobra.Command{
		Use:   "migrate",
		Short: "Migrate jail to another zpool",
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			MigrateJail(args)
			WriteConfigToDisk(false)
		},
	}

	migrateCleanCmd = &cobra.Command{
		Use:   "clean",
		Short: "Clean previous aborted/in error jail migration",
		Run: func(cmd *cobra.Command, args []string) {
			// Load inventory
			ListJails(args, false)
			CleanMigrateMess(args)
		},
	}

)

// TODO : Init log level and log output
func init() {
	cobra.OnInitialize(initConfig)

	// Global switches
	rootCmd.PersistentFlags().StringVarP(&gConfigFile, "config", "c", "/usr/local/etc/gocage.conf.yml", "GoCage configuration file")
	rootCmd.PersistentFlags().BoolVarP(&gUseSudo, "sudo", "u", false, "Use sudo to run commands")
	rootCmd.PersistentFlags().StringVarP(&gTimeZone, "timezone", "t", "", "Specify timezone. Will get from /var/db/zoneinfo if not set.")

	// Command dependant switches

	// These are persistent so we can reuse them in "gocage list snapshot myjail" command (TODO)
	listCmd.PersistentFlags().StringVarP(&gDisplayColumns, "outcol", "o", "JID,Name,Config.Release,Config.Ip4_addr,Running", "Show these columns in output")
	listCmd.PersistentFlags().BoolVarP(&gNoLineSep, "nolinesep", "l", false, "Do not display line separator between jails")
	listCmd.PersistentFlags().StringVarP(&gFilterJails, "filter", "f", "none", "Only display jails with these values. Ex: \"gocage list -f Config.Boot=1\" will only list started on boot jails")
	listCmd.PersistentFlags().StringVarP(&gSortFields, "sort", "s", "none", "Display jails sorted by field values. Ex: \"gocage list -s +Name,-Config.Priority\" will sort jails by their decreasing name, then increasing start priority. 3 critera max supported.")

	// This is local flag : Only available to gocage snapshot create command
	snapshotCreateCmd.Flags().StringVarP(&gSnapshotName, "snapname", "n", "", "Name of the snapshot to create")
	snapshotCreateCmd.MarkFlagRequired("snapname")
	snapshotDeleteCmd.Flags().StringVarP(&gSnapshotName, "snapname", "n", "", "Name of the snapshot to destroy")
	snapshotDeleteCmd.MarkFlagRequired("snapname")
	snapshotRollbackCmd.Flags().StringVarP(&gSnapshotName, "snapname", "n", "", "Name of the snapshot to rollback to")
	snapshotRollbackCmd.MarkFlagRequired("snapname")

	migrateCmd.Flags().StringVarP(&gMigrateDestPool, "destpool", "d", "", "Name of zfs destination pool for jail")
	migrateCmd.MarkFlagRequired("destpool")

	// Now declare commands
	rootCmd.AddCommand(versionCmd)
	rootCmd.AddCommand(listCmd)
	listCmd.AddCommand(listPropsCmd)
	rootCmd.AddCommand(stopCmd)
	rootCmd.AddCommand(startCmd)
	rootCmd.AddCommand(getCmd)
	rootCmd.AddCommand(setCmd)
	rootCmd.AddCommand(snapshotCmd)
	rootCmd.AddCommand(migrateCmd)
	snapshotCmd.AddCommand(snapshotListCmd)
	snapshotCmd.AddCommand(snapshotCreateCmd)
	snapshotCmd.AddCommand(snapshotDeleteCmd)
	snapshotCmd.AddCommand(snapshotRollbackCmd)
	migrateCmd.AddCommand(migrateCleanCmd)

	// Get FreeBSD version
	out, err := executeCommand("freebsd-version")
	if err != nil {
		fmt.Printf("Error running \"freebsd-version\": %s", err.Error())
		os.Exit(1)
	}
	gHostVersion, _ = strconv.ParseFloat(strings.Split(out, "-")[0], 32)

}

func initConfig() {
	if gConfigFile == "" {
		fmt.Println("No config file!")
		os.Exit(1)
	}

	//	fmt.Printf("We are in initConfig(), with config file %s\n", gConfigFile)

	viper.SetConfigFile(gConfigFile)

	if err := viper.ReadInConfig(); err != nil {
		fmt.Printf("ERROR reading config file %s : %s\n", gConfigFile, err.Error())
		os.Exit(1)
	}

	//	fmt.Println("Using config file:", viper.ConfigFileUsed())
	//	fmt.Printf("datastore in config : %s\n", viper.GetStringSlice("datastore"))
	//	fmt.Printf("datastore.0 in config : %s\n", viper.GetStringSlice("datastore.0"))

	// Command line flags have priority on config file
	if rootCmd.Flags().Lookup("sudo") != nil && false == rootCmd.Flags().Lookup("sudo").Changed {
		gUseSudo = viper.GetBool("sudo")
	}
	if rootCmd.Flags().Lookup("timezone") != nil && false == rootCmd.Flags().Lookup("timezone").Changed {
		gTimeZone = viper.GetString("timezone")
	}
	// If neither on cmdline nor config file, get from /var/db/zoneinfo
	if len(gTimeZone) == 0 {
		tz, err := ioutil.ReadFile("/var/db/zoneinfo")
		if err != nil {
			fmt.Println("Error reading /var/db/zoneinfo: %s\n", err.Error())
			os.Exit(1)
		}
		gTimeZone = strings.Trim(string(tz), "\n")
	}
	if listCmd.Flags().Lookup("outcol") != nil && false == listCmd.Flags().Lookup("outcol").Changed {
		gDisplayColumns = viper.GetString("outcol")
	}
	if listCmd.Flags().Lookup("nolinesep") != nil && false == listCmd.Flags().Lookup("nolinesep").Changed {
		gNoLineSep = viper.GetBool("nolinesep")
	}
	if listCmd.Flags().Lookup("filter") != nil && false == listCmd.Flags().Lookup("filter").Changed {
		gFilterJails = viper.GetString("filter")
	}
	if listCmd.Flags().Lookup("sort") != nil && false == listCmd.Flags().Lookup("sort").Changed {
		gSortFields = viper.GetString("sort")
	}
	if len(strings.Split(gSortFields, ",")) > 3 {
		fmt.Printf("More than 3 sort criteria is not supported!\n")
		os.Exit(1)
	}
}

/********************************************************************************
 * Write jails config which been updated to disk.
 * If changeauto not set, values which are in "auto" mode on disk
 *  won't be overwritten (p.ex defaultrouter wont be overwritten with current
 *  default route, so if route change on jailhost this will reflect on jail next
 *  start)
 *******************************************************************************/
func WriteConfigToDisk(changeauto bool) {
	for _, j := range gJails {
		if j.ConfigUpdated {

			// we will manipulate properties so get a copy
			jc := j.Config

			if changeauto == false {
				// Overwrite "auto" properties
				ondiskjc, err := getJailConfig(j.ConfigPath)
				if err != nil {
					panic(err)
				}
				// TODO : List all fields, then call getStructFieldValue to compare value with "auto"
				// If "auto" then keep it that way before writing ondiskjc to disk
				var properties []string
				properties = getStructFieldNames(ondiskjc, properties, "")

				for _, p := range properties {
					v, _, err := getStructFieldValue(ondiskjc, p)
					if err != nil {
						panic(err)
					}
					if v.String() == "auto" {
						err = setStructFieldValue(&jc, p, "auto")
						if err != nil {
							fmt.Printf("ERROR sanitizing config: %s\n", err.Error())
							os.Exit(1)
						}
					}
				}
			}

			marshaled, err := json.MarshalIndent(jc, "", "    ")
			if err != nil {
				fmt.Printf("ERROR marshaling config: %s\n", err.Error())
			}
			//fmt.Printf(string(marshaled))
			if os.WriteFile(j.ConfigPath, []byte(marshaled), 0644); err != nil {
				fmt.Printf("Error writing config file %s: %v\n", j.ConfigPath, err)
				os.Exit(1)
			}
		}
	}
}

func Execute() {
	if err := rootCmd.Execute(); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}