// Package cmd provides Command Line Interface support
package cmd

import (
	"fmt"
	"os"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"

	"github.com/drakkan/sftpgo/version"
)

const (
	configDirFlag            = "config-dir"
	configDirKey             = "config_dir"
	configFileFlag           = "config-file"
	logFilePathFlag          = "log-file-path"
	logFilePathKey           = "log_file_path"
	logMaxSizeFlag           = "log-max-size"
	logMaxSizeKey            = "log_max_size"
	logMaxBackupFlag         = "log-max-backups"
	logMaxBackupKey          = "log_max_backups"
	logMaxAgeFlag            = "log-max-age"
	logMaxAgeKey             = "log_max_age"
	logCompressFlag          = "log-compress"
	logCompressKey           = "log_compress"
	logVerboseFlag           = "log-verbose"
	logVerboseKey            = "log_verbose"
	profilerFlag             = "profiler"
	profilerKey              = "profiler"
	loadDataFromFlag         = "loaddata-from"
	loadDataFromKey          = "loaddata_from"
	loadDataModeFlag         = "loaddata-mode"
	loadDataModeKey          = "loaddata_mode"
	loadDataQuotaScanFlag    = "loaddata-scan"
	loadDataQuotaScanKey     = "loaddata_scan"
	loadDataCleanFlag        = "loaddata-clean"
	loadDataCleanKey         = "loaddata_clean"
	defaultConfigDir         = "."
	defaultLogFile           = "sftpgo.log"
	defaultLogMaxSize        = 10
	defaultLogMaxBackup      = 5
	defaultLogMaxAge         = 28
	defaultLogCompress       = false
	defaultLogVerbose        = true
	defaultProfiler          = false
	defaultLoadDataFrom      = ""
	defaultLoadDataMode      = 1
	defaultLoadDataQuotaScan = 0
	defaultLoadDataClean     = false
)

var (
	configDir         string
	configFile        string
	logFilePath       string
	logMaxSize        int
	logMaxBackups     int
	logMaxAge         int
	logCompress       bool
	logVerbose        bool
	profiler          bool
	loadDataFrom      string
	loadDataMode      int
	loadDataQuotaScan int
	loadDataClean     bool

	rootCmd = &cobra.Command{
		Use:   "sftpgo",
		Short: "Fully featured and highly configurable SFTP server",
	}
)

func init() {
	rootCmd.Flags().BoolP("version", "v", false, "")
	rootCmd.Version = version.GetAsString()
	rootCmd.SetVersionTemplate(`{{printf "SFTPGo "}}{{printf "%s" .Version}}
`)
}

// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
	if err := rootCmd.Execute(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}

func addConfigFlags(cmd *cobra.Command) {
	viper.SetDefault(configDirKey, defaultConfigDir)
	viper.BindEnv(configDirKey, "SFTPGO_CONFIG_DIR") //nolint:errcheck // err is not nil only if the key to bind is missing
	cmd.Flags().StringVarP(&configDir, configDirFlag, "c", viper.GetString(configDirKey),
		`Location for SFTPGo config dir. This directory
should contain the "sftpgo" configuration file.
It is used as the base for files with a relative path
(eg. the private keys for the SFTP server, the SQLite
database if you use SQLite as data provider).
This flag can be set using SFTPGO_CONFIG_DIR
env var too.`)
	viper.BindPFlag(configDirKey, cmd.Flags().Lookup(configDirFlag)) //nolint:errcheck

	cmd.Flags().StringVar(&configFile, configFileFlag, os.Getenv("SFTPGO_CONFIG_FILE"),
		`Path to SFTPGo configuration file. It must be
an absolute path to a file or a path relative to the working directory.
The specified file name must have a supported extension
(JSON, YAML, TOML or Java properties).
This flag can be set using SFTPGO_CONFIG_FILE
env var too.`)
}

func addServeFlags(cmd *cobra.Command) {
	addConfigFlags(cmd)

	viper.SetDefault(logFilePathKey, defaultLogFile)
	viper.BindEnv(logFilePathKey, "SFTPGO_LOG_FILE_PATH") //nolint:errcheck
	cmd.Flags().StringVarP(&logFilePath, logFilePathFlag, "l", viper.GetString(logFilePathKey),
		`Location for the log file. Leave empty to write
logs to the standard output. This flag can be
set using SFTPGO_LOG_FILE_PATH env var too.
`)
	viper.BindPFlag(logFilePathKey, cmd.Flags().Lookup(logFilePathFlag)) //nolint:errcheck

	viper.SetDefault(logMaxSizeKey, defaultLogMaxSize)
	viper.BindEnv(logMaxSizeKey, "SFTPGO_LOG_MAX_SIZE") //nolint:errcheck
	cmd.Flags().IntVarP(&logMaxSize, logMaxSizeFlag, "s", viper.GetInt(logMaxSizeKey),
		`Maximum size in megabytes of the log file
before it gets rotated. This flag can be set
using SFTPGO_LOG_MAX_SIZE env var too. It is
unused if log-file-path is empty.
`)
	viper.BindPFlag(logMaxSizeKey, cmd.Flags().Lookup(logMaxSizeFlag)) //nolint:errcheck

	viper.SetDefault(logMaxBackupKey, defaultLogMaxBackup)
	viper.BindEnv(logMaxBackupKey, "SFTPGO_LOG_MAX_BACKUPS") //nolint:errcheck
	cmd.Flags().IntVarP(&logMaxBackups, "log-max-backups", "b", viper.GetInt(logMaxBackupKey),
		`Maximum number of old log files to retain.
This flag can be set using SFTPGO_LOG_MAX_BACKUPS
env var too. It is unused if log-file-path is
empty.`)
	viper.BindPFlag(logMaxBackupKey, cmd.Flags().Lookup(logMaxBackupFlag)) //nolint:errcheck

	viper.SetDefault(logMaxAgeKey, defaultLogMaxAge)
	viper.BindEnv(logMaxAgeKey, "SFTPGO_LOG_MAX_AGE") //nolint:errcheck
	cmd.Flags().IntVarP(&logMaxAge, "log-max-age", "a", viper.GetInt(logMaxAgeKey),
		`Maximum number of days to retain old log files.
This flag can be set using SFTPGO_LOG_MAX_AGE env
var too. It is unused if log-file-path is empty.
`)
	viper.BindPFlag(logMaxAgeKey, cmd.Flags().Lookup(logMaxAgeFlag)) //nolint:errcheck

	viper.SetDefault(logCompressKey, defaultLogCompress)
	viper.BindEnv(logCompressKey, "SFTPGO_LOG_COMPRESS") //nolint:errcheck
	cmd.Flags().BoolVarP(&logCompress, logCompressFlag, "z", viper.GetBool(logCompressKey),
		`Determine if the rotated log files
should be compressed using gzip. This flag can
be set using SFTPGO_LOG_COMPRESS env var too.
It is unused if log-file-path is empty.
`)
	viper.BindPFlag(logCompressKey, cmd.Flags().Lookup(logCompressFlag)) //nolint:errcheck

	viper.SetDefault(logVerboseKey, defaultLogVerbose)
	viper.BindEnv(logVerboseKey, "SFTPGO_LOG_VERBOSE") //nolint:errcheck
	cmd.Flags().BoolVarP(&logVerbose, logVerboseFlag, "v", viper.GetBool(logVerboseKey),
		`Enable verbose logs. This flag can be set
using SFTPGO_LOG_VERBOSE env var too.
`)
	viper.BindPFlag(logVerboseKey, cmd.Flags().Lookup(logVerboseFlag)) //nolint:errcheck

	viper.SetDefault(profilerKey, defaultProfiler)
	viper.BindEnv(profilerKey, "SFTPGO_PROFILER") //nolint:errcheck
	cmd.Flags().BoolVarP(&profiler, profilerFlag, "p", viper.GetBool(profilerKey),
		`Enable the built-in profiler. The profiler will
be accessible via HTTP/HTTPS using the base URL
"/debug/pprof/".
This flag can be set using SFTPGO_PROFILER env
var too.`)
	viper.BindPFlag(profilerKey, cmd.Flags().Lookup(profilerFlag)) //nolint:errcheck

	viper.SetDefault(loadDataFromKey, defaultLoadDataFrom)
	viper.BindEnv(loadDataFromKey, "SFTPGO_LOADDATA_FROM") //nolint:errcheck
	cmd.Flags().StringVar(&loadDataFrom, loadDataFromFlag, viper.GetString(loadDataFromKey),
		`Load users and folders from this file.
The file must be specified as absolute path
and it must contain a backup obtained using
the "dumpdata" REST API or compatible content.
This flag can be set using SFTPGO_LOADDATA_FROM
env var too.
`)
	viper.BindPFlag(loadDataFromKey, cmd.Flags().Lookup(loadDataFromFlag)) //nolint:errcheck

	viper.SetDefault(loadDataModeKey, defaultLoadDataMode)
	viper.BindEnv(loadDataModeKey, "SFTPGO_LOADDATA_MODE") //nolint:errcheck
	cmd.Flags().IntVar(&loadDataMode, loadDataModeFlag, viper.GetInt(loadDataModeKey),
		`Restore mode for data to load:
  0 - new users are added, existing users are
      updated
  1 - New users are added, existing users are
	  not modified
This flag can be set using SFTPGO_LOADDATA_MODE
env var too.
`)
	viper.BindPFlag(loadDataModeKey, cmd.Flags().Lookup(loadDataModeFlag)) //nolint:errcheck

	viper.SetDefault(loadDataQuotaScanKey, defaultLoadDataQuotaScan)
	viper.BindEnv(loadDataQuotaScanKey, "SFTPGO_LOADDATA_QUOTA_SCAN") //nolint:errcheck
	cmd.Flags().IntVar(&loadDataQuotaScan, loadDataQuotaScanFlag, viper.GetInt(loadDataQuotaScanKey),
		`Quota scan mode after data load:
  0 - no quota scan
  1 - scan quota
  2 - scan quota if the user has quota restrictions
This flag can be set using SFTPGO_LOADDATA_QUOTA_SCAN
env var too.
(default 0)`)
	viper.BindPFlag(loadDataQuotaScanKey, cmd.Flags().Lookup(loadDataQuotaScanFlag)) //nolint:errcheck

	viper.SetDefault(loadDataCleanKey, defaultLoadDataClean)
	viper.BindEnv(loadDataCleanKey, "SFTPGO_LOADDATA_CLEAN") //nolint:errcheck
	cmd.Flags().BoolVar(&loadDataClean, loadDataCleanFlag, viper.GetBool(loadDataCleanKey),
		`Determine if the loaddata-from file should
be removed after a successful load. This flag
can be set using SFTPGO_LOADDATA_CLEAN env var
too. (default "false")
`)
	viper.BindPFlag(logCompressKey, cmd.Flags().Lookup(logCompressFlag)) //nolint:errcheck
}