package s3

import (
	"context"
	_ "embed"
	"strings"

	"github.com/rclone/rclone/cmd"
	"github.com/rclone/rclone/cmd/serve/proxy/proxyflags"
	"github.com/rclone/rclone/fs"
	"github.com/rclone/rclone/fs/config/flags"
	"github.com/rclone/rclone/fs/hash"
	httplib "github.com/rclone/rclone/lib/http"
	"github.com/rclone/rclone/vfs"
	"github.com/rclone/rclone/vfs/vfsflags"
	"github.com/spf13/cobra"
)

// DefaultOpt is the default values used for Options
var DefaultOpt = Options{
	pathBucketMode: true,
	hashName:       "MD5",
	hashType:       hash.MD5,
	noCleanup:      false,
	Auth:           httplib.DefaultAuthCfg(),
	HTTP:           httplib.DefaultCfg(),
}

// Opt is options set by command line flags
var Opt = DefaultOpt

const flagPrefix = ""

func init() {
	flagSet := Command.Flags()
	httplib.AddAuthFlagsPrefix(flagSet, flagPrefix, &Opt.Auth)
	httplib.AddHTTPFlagsPrefix(flagSet, flagPrefix, &Opt.HTTP)
	vfsflags.AddFlags(flagSet)
	proxyflags.AddFlags(flagSet)
	flags.BoolVarP(flagSet, &Opt.pathBucketMode, "force-path-style", "", Opt.pathBucketMode, "If true use path style access if false use virtual hosted style (default true)", "")
	flags.StringVarP(flagSet, &Opt.hashName, "etag-hash", "", Opt.hashName, "Which hash to use for the ETag, or auto or blank for off", "")
	flags.StringArrayVarP(flagSet, &Opt.authPair, "auth-key", "", Opt.authPair, "Set key pair for v4 authorization: access_key_id,secret_access_key", "")
	flags.BoolVarP(flagSet, &Opt.noCleanup, "no-cleanup", "", Opt.noCleanup, "Not to cleanup empty folder after object is deleted", "")
}

//go:embed serve_s3.md
var serveS3Help string

// help returns the help string cleaned up to simplify appending
func help() string {
	return strings.TrimSpace(serveS3Help) + "\n\n"
}

// Command definition for cobra
var Command = &cobra.Command{
	Annotations: map[string]string{
		"versionIntroduced": "v1.65",
		"groups":            "Filter",
		"status":            "Experimental",
	},
	Use:   "s3 remote:path",
	Short: `Serve remote:path over s3.`,
	Long:  help() + httplib.AuthHelp(flagPrefix) + httplib.Help(flagPrefix) + vfs.Help(),
	RunE: func(command *cobra.Command, args []string) error {
		var f fs.Fs
		if proxyflags.Opt.AuthProxy == "" {
			cmd.CheckArgs(1, 1, command, args)
			f = cmd.NewFsSrc(args)
		} else {
			cmd.CheckArgs(0, 0, command, args)
		}

		if Opt.hashName == "auto" {
			Opt.hashType = f.Hashes().GetOne()
		} else if Opt.hashName != "" {
			err := Opt.hashType.Set(Opt.hashName)
			if err != nil {
				return err
			}
		}
		cmd.Run(false, false, command, func() error {
			s, err := newServer(context.Background(), f, &Opt)
			if err != nil {
				return err
			}
			router := s.server.Router()
			s.Bind(router)
			err = s.Serve()
			if err != nil {
				return err
			}
			s.server.Wait()
			return nil
		})
		return nil
	},
}