// Package cmd provides Command Line Interface support
package cmd

import (
	"fmt"
	"os"

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

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

const (
	configDirFlag       = "config-dir"
	configDirKey        = "config_dir"
	configFileFlag      = "config-file"
	configFileKey       = "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"
	defaultConfigDir    = "."
	defaultConfigName   = config.DefaultConfigName
	defaultLogFile      = "sftpgo.log"
	defaultLogMaxSize   = 10
	defaultLogMaxBackup = 5
	defaultLogMaxAge    = 28
	defaultLogCompress  = false
	defaultLogVerbose   = true
	defaultProfiler     = false
)

var (
	configDir     string
	configFile    string
	logFilePath   string
	logMaxSize    int
	logMaxBackups int
	logMaxAge     int
	logCompress   bool
	logVerbose    bool
	profiler      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
or the configured config-file and 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

	viper.SetDefault(configFileKey, defaultConfigName)
	viper.BindEnv(configFileKey, "SFTPGO_CONFIG_FILE") //nolint:errcheck
	cmd.Flags().StringVarP(&configFile, configFileFlag, "f", viper.GetString(configFileKey),
		`Name for SFTPGo configuration file. It must be
the name of a file stored in config-dir not the
absolute path to the configuration file. The
specified file name must have no extension we
automatically load JSON, YAML, TOML, HCL and
Java properties. Therefore if you set "sftpgo"
then "sftpgo.json", "sftpgo.yaml" and so on
are searched.
This flag can be set using SFTPGO_CONFIG_FILE
env var too.`)
	viper.BindPFlag(configFileKey, cmd.Flags().Lookup(configFileFlag)) //nolint:errcheck
}

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
}