package config

import (
	"context"
	"encoding/json"
	"fmt"
	"os"
	"sort"
	"strings"

	"github.com/pkg/errors"
	"github.com/rclone/rclone/cmd"
	"github.com/rclone/rclone/fs"
	"github.com/rclone/rclone/fs/config"
	"github.com/rclone/rclone/fs/config/flags"
	"github.com/rclone/rclone/fs/rc"
	"github.com/spf13/cobra"
	"github.com/spf13/pflag"
)

func init() {
	cmd.Root.AddCommand(configCommand)
	configCommand.AddCommand(configEditCommand)
	configCommand.AddCommand(configFileCommand)
	configCommand.AddCommand(configShowCommand)
	configCommand.AddCommand(configDumpCommand)
	configCommand.AddCommand(configProvidersCommand)
	configCommand.AddCommand(configCreateCommand)
	configCommand.AddCommand(configUpdateCommand)
	configCommand.AddCommand(configDeleteCommand)
	configCommand.AddCommand(configPasswordCommand)
	configCommand.AddCommand(configReconnectCommand)
	configCommand.AddCommand(configDisconnectCommand)
	configCommand.AddCommand(configUserInfoCommand)
}

var configCommand = &cobra.Command{
	Use:   "config",
	Short: `Enter an interactive configuration session.`,
	Long: `Enter an interactive configuration session where you can setup new
remotes and manage existing ones. You may also set or remove a
password to protect your configuration.
`,
	Run: func(command *cobra.Command, args []string) {
		cmd.CheckArgs(0, 0, command, args)
		config.EditConfig()
	},
}

var configEditCommand = &cobra.Command{
	Use:   "edit",
	Short: configCommand.Short,
	Long:  configCommand.Long,
	Run:   configCommand.Run,
}

var configFileCommand = &cobra.Command{
	Use:   "file",
	Short: `Show path of configuration file in use.`,
	Run: func(command *cobra.Command, args []string) {
		cmd.CheckArgs(0, 0, command, args)
		config.ShowConfigLocation()
	},
}

var configShowCommand = &cobra.Command{
	Use:   "show [<remote>]",
	Short: `Print (decrypted) config file, or the config for a single remote.`,
	Run: func(command *cobra.Command, args []string) {
		cmd.CheckArgs(0, 1, command, args)
		if len(args) == 0 {
			config.ShowConfig()
		} else {
			name := strings.TrimRight(args[0], ":")
			config.ShowRemote(name)
		}
	},
}

var configDumpCommand = &cobra.Command{
	Use:   "dump",
	Short: `Dump the config file as JSON.`,
	RunE: func(command *cobra.Command, args []string) error {
		cmd.CheckArgs(0, 0, command, args)
		return config.Dump()
	},
}

var configProvidersCommand = &cobra.Command{
	Use:   "providers",
	Short: `List in JSON format all the providers and options.`,
	RunE: func(command *cobra.Command, args []string) error {
		cmd.CheckArgs(0, 0, command, args)
		return config.JSONListProviders()
	},
}

var (
	configObscure   bool
	configNoObscure bool
)

const configPasswordHelp = `
If any of the parameters passed is a password field, then rclone will
automatically obscure them if they aren't already obscured before
putting them in the config file.

**NB** If the password parameter is 22 characters or longer and
consists only of base64 characters then rclone can get confused about
whether the password is already obscured or not and put unobscured
passwords into the config file. If you want to be 100% certain that
the passwords get obscured then use the "--obscure" flag, or if you
are 100% certain you are already passing obscured passwords then use
"--no-obscure".  You can also set obscured passwords using the
"rclone config password" command.
`

var configCreateCommand = &cobra.Command{
	Use:   "create `name` `type` [`key` `value`]*",
	Short: `Create a new remote with name, type and options.`,
	Long: `
Create a new remote of ` + "`name`" + ` with ` + "`type`" + ` and options.  The options
should be passed in pairs of ` + "`key` `value`" + `.

For example to make a swift remote of name myremote using auto config
you would do:

    rclone config create myremote swift env_auth true

Note that if the config process would normally ask a question the
default is taken.  Each time that happens rclone will print a message
saying how to affect the value taken.
` + configPasswordHelp + `
So for example if you wanted to configure a Google Drive remote but
using remote authorization you would do this:

    rclone config create mydrive drive config_is_local false
`,
	RunE: func(command *cobra.Command, args []string) error {
		cmd.CheckArgs(2, 256, command, args)
		in, err := argsToMap(args[2:])
		if err != nil {
			return err
		}
		err = config.CreateRemote(context.Background(), args[0], args[1], in, configObscure, configNoObscure)
		if err != nil {
			return err
		}
		config.ShowRemote(args[0])
		return nil
	},
}

func init() {
	for _, cmdFlags := range []*pflag.FlagSet{configCreateCommand.Flags(), configUpdateCommand.Flags()} {
		flags.BoolVarP(cmdFlags, &configObscure, "obscure", "", false, "Force any passwords to be obscured.")
		flags.BoolVarP(cmdFlags, &configNoObscure, "no-obscure", "", false, "Force any passwords not to be obscured.")
	}
}

var configUpdateCommand = &cobra.Command{
	Use:   "update `name` [`key` `value`]+",
	Short: `Update options in an existing remote.`,
	Long: `
Update an existing remote's options. The options should be passed in
in pairs of ` + "`key` `value`" + `.

For example to update the env_auth field of a remote of name myremote
you would do:

    rclone config update myremote swift env_auth true
` + configPasswordHelp + `
If the remote uses OAuth the token will be updated, if you don't
require this add an extra parameter thus:

    rclone config update myremote swift env_auth true config_refresh_token false
`,
	RunE: func(command *cobra.Command, args []string) error {
		cmd.CheckArgs(3, 256, command, args)
		in, err := argsToMap(args[1:])
		if err != nil {
			return err
		}
		err = config.UpdateRemote(context.Background(), args[0], in, configObscure, configNoObscure)
		if err != nil {
			return err
		}
		config.ShowRemote(args[0])
		return nil
	},
}

var configDeleteCommand = &cobra.Command{
	Use:   "delete `name`",
	Short: "Delete an existing remote `name`.",
	Run: func(command *cobra.Command, args []string) {
		cmd.CheckArgs(1, 1, command, args)
		config.DeleteRemote(args[0])
	},
}

var configPasswordCommand = &cobra.Command{
	Use:   "password `name` [`key` `value`]+",
	Short: `Update password in an existing remote.`,
	Long: `
Update an existing remote's password. The password
should be passed in pairs of ` + "`key` `value`" + `.

For example to set password of a remote of name myremote you would do:

    rclone config password myremote fieldname mypassword

This command is obsolete now that "config update" and "config create"
both support obscuring passwords directly.
`,
	RunE: func(command *cobra.Command, args []string) error {
		cmd.CheckArgs(3, 256, command, args)
		in, err := argsToMap(args[1:])
		if err != nil {
			return err
		}
		err = config.PasswordRemote(context.Background(), args[0], in)
		if err != nil {
			return err
		}
		config.ShowRemote(args[0])
		return nil
	},
}

// This takes a list of arguments in key value key value form and
// converts it into a map
func argsToMap(args []string) (out rc.Params, err error) {
	if len(args)%2 != 0 {
		return nil, errors.New("found key without value")
	}
	out = rc.Params{}
	// Set the config
	for i := 0; i < len(args); i += 2 {
		out[args[i]] = args[i+1]
	}
	return out, nil
}

var configReconnectCommand = &cobra.Command{
	Use:   "reconnect remote:",
	Short: `Re-authenticates user with remote.`,
	Long: `
This reconnects remote: passed in to the cloud storage system.

To disconnect the remote use "rclone config disconnect".

This normally means going through the interactive oauth flow again.
`,
	RunE: func(command *cobra.Command, args []string) error {
		ctx := context.Background()
		cmd.CheckArgs(1, 1, command, args)
		fsInfo, configName, _, config, err := fs.ConfigFs(args[0])
		if err != nil {
			return err
		}
		if fsInfo.Config == nil {
			return errors.Errorf("%s: doesn't support Reconnect", configName)
		}
		fsInfo.Config(ctx, configName, config)
		return nil
	},
}

var configDisconnectCommand = &cobra.Command{
	Use:   "disconnect remote:",
	Short: `Disconnects user from remote`,
	Long: `
This disconnects the remote: passed in to the cloud storage system.

This normally means revoking the oauth token.

To reconnect use "rclone config reconnect".
`,
	RunE: func(command *cobra.Command, args []string) error {
		cmd.CheckArgs(1, 1, command, args)
		f := cmd.NewFsSrc(args)
		doDisconnect := f.Features().Disconnect
		if doDisconnect == nil {
			return errors.Errorf("%v doesn't support Disconnect", f)
		}
		err := doDisconnect(context.Background())
		if err != nil {
			return errors.Wrap(err, "Disconnect call failed")
		}
		return nil
	},
}

var (
	jsonOutput bool
)

func init() {
	flags.BoolVarP(configUserInfoCommand.Flags(), &jsonOutput, "json", "", false, "Format output as JSON")
}

var configUserInfoCommand = &cobra.Command{
	Use:   "userinfo remote:",
	Short: `Prints info about logged in user of remote.`,
	Long: `
This prints the details of the person logged in to the cloud storage
system.
`,
	RunE: func(command *cobra.Command, args []string) error {
		cmd.CheckArgs(1, 1, command, args)
		f := cmd.NewFsSrc(args)
		doUserInfo := f.Features().UserInfo
		if doUserInfo == nil {
			return errors.Errorf("%v doesn't support UserInfo", f)
		}
		u, err := doUserInfo(context.Background())
		if err != nil {
			return errors.Wrap(err, "UserInfo call failed")
		}
		if jsonOutput {
			out := json.NewEncoder(os.Stdout)
			out.SetIndent("", "\t")
			return out.Encode(u)
		}
		var keys []string
		var maxKeyLen int
		for key := range u {
			keys = append(keys, key)
			if len(key) > maxKeyLen {
				maxKeyLen = len(key)
			}
		}
		sort.Strings(keys)
		for _, key := range keys {
			fmt.Printf("%*s: %s\n", maxKeyLen, key, u[key])
		}
		return nil
	},
}