// Copyright 2016 TiKV Project Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package pdctl

import (
	"fmt"
	"io"
	"os"
	"strings"

	"github.com/chzyer/readline"
	"github.com/mattn/go-shellwords"
	"github.com/spf13/cobra"
	"github.com/spf13/pflag"
	"github.com/tikv/pd/pkg/versioninfo"
	"github.com/tikv/pd/tools/pd-ctl/pdctl/command"
)

func init() {
	cobra.EnablePrefixMatching = false
	cobra.EnableTraverseRunHooks = true
}

// GetRootCmd is exposed for integration tests. But it can be embedded into another suite, too.
func GetRootCmd() *cobra.Command {
	rootCmd := &cobra.Command{
		Use:               "pd-ctl",
		Short:             "Placement Driver control",
		PersistentPreRunE: command.RequireHTTPSClient,
		SilenceErrors:     true,
	}

	rootCmd.PersistentFlags().StringP("pd", "u", "http://127.0.0.1:2379", "address of PD")
	rootCmd.PersistentFlags().String("cacert", os.Getenv("CA_PATH"), "path of file that contains list of trusted SSL CAs")
	rootCmd.PersistentFlags().String("cert", os.Getenv("CERT_PATH"), "path of file that contains X509 certificate in PEM format")
	rootCmd.PersistentFlags().String("key", os.Getenv("KEY_PATH"), "path of file that contains X509 key in PEM format")

	rootCmd.Flags().ParseErrorsWhitelist.UnknownFlags = true

	rootCmd.AddCommand(
		command.NewConfigCommand(),
		command.NewRegionCommand(),
		command.NewStoreCommand(),
		command.NewStoresCommand(),
		command.NewMemberCommand(),
		command.NewExitCommand(),
		command.NewLabelCommand(),
		command.NewPingCommand(),
		command.NewOperatorCommand(),
		command.NewSchedulerCommand(),
		command.NewTSOCommand(),
		command.NewHotSpotCommand(),
		command.NewClusterCommand(),
		command.NewHealthCommand(),
		command.NewLogCommand(),
		command.NewPluginCommand(),
		command.NewServiceGCSafepointCommand(),
		command.NewMinResolvedTSCommand(),
		command.NewCompletionCommand(),
		command.NewUnsafeCommand(),
		command.NewKeyspaceGroupCommand(),
		command.NewKeyspaceCommand(),
		command.NewResourceManagerCommand(),
		command.NewMetaServiceGroupCommand(),
		command.NewMicroServicesCommand(),
	)

	return rootCmd
}

// MainStart start main command
func MainStart(args []string) {
	rootCmd := GetRootCmd()

	rootCmd.Flags().BoolP("interact", "i", false, "Run pdctl with readline.")
	rootCmd.Flags().BoolP("version", "V", false, "Print version information and exit.")
	// TODO: deprecated
	rootCmd.Flags().BoolP("detach", "d", true, "Run pdctl without readline.")

	rootCmd.Run = func(cmd *cobra.Command, _ []string) {
		if v, err := cmd.Flags().GetBool("version"); err == nil && v {
			versioninfo.Print()
			return
		}
		if v, err := cmd.Flags().GetBool("interact"); err == nil && v {
			readlineCompleter := readline.NewPrefixCompleter(genCompleter(cmd)...)
			loop(cmd.PersistentFlags(), readlineCompleter)
		}
	}

	rootCmd.SetArgs(args)
	rootCmd.ParseFlags(args)
	rootCmd.SetOut(os.Stdout)
	rootCmd.SetErr(os.Stderr)

	if err := rootCmd.Execute(); err != nil {
		rootCmd.Println(err)
		os.Exit(1)
	}
}

func loop(persistentFlags *pflag.FlagSet, readlineCompleter readline.AutoCompleter) {
	l, err := readline.NewEx(&readline.Config{
		Prompt:            "\033[31m»\033[0m ",
		HistoryFile:       "/tmp/readline.tmp",
		AutoComplete:      readlineCompleter,
		InterruptPrompt:   "^C",
		EOFPrompt:         "^D",
		HistorySearchFold: true,
	})
	if err != nil {
		panic(err)
	}
	defer l.Close()

	getREPLCmd := func() *cobra.Command {
		rootCmd := GetRootCmd()
		persistentFlags.VisitAll(func(flag *pflag.Flag) {
			if flag.Changed {
				rootCmd.PersistentFlags().Set(flag.Name, flag.Value.String())
			}
		})
		rootCmd.LocalFlags().MarkHidden("pd")
		rootCmd.LocalFlags().MarkHidden("cacert")
		rootCmd.LocalFlags().MarkHidden("cert")
		rootCmd.LocalFlags().MarkHidden("key")
		rootCmd.SetOut(os.Stdout)
		return rootCmd
	}

	for {
		line, err := l.Readline()
		if err != nil {
			if err == readline.ErrInterrupt {
				break
			} else if err == io.EOF {
				break
			}
			continue
		}
		if line == "exit" {
			os.Exit(0)
		}
		args, err := shellwords.Parse(line)
		if err != nil {
			fmt.Printf("parse command err: %v\n", err)
			continue
		}

		rootCmd := getREPLCmd()
		rootCmd.SetArgs(args)
		rootCmd.ParseFlags(args)
		if err := rootCmd.Execute(); err != nil {
			rootCmd.Println(err)
		}
	}
}

func genCompleter(cmd *cobra.Command) []readline.PrefixCompleterInterface {
	pc := []readline.PrefixCompleterInterface{}

	for _, v := range cmd.Commands() {
		if v.HasFlags() {
			flagsPc := []readline.PrefixCompleterInterface{}
			flagUsages := strings.Split(strings.Trim(v.Flags().FlagUsages(), " "), "\n")
			for i := range len(flagUsages) - 1 {
				flagsPc = append(flagsPc, readline.PcItem(strings.Split(strings.Trim(flagUsages[i], " "), " ")[0]))
			}
			flagsPc = append(flagsPc, genCompleter(v)...)
			pc = append(pc, readline.PcItem(strings.Split(v.Use, " ")[0], flagsPc...))
		} else {
			pc = append(pc, readline.PcItem(strings.Split(v.Use, " ")[0], genCompleter(v)...))
		}
	}
	return pc
}

// ReadStdin convert stdin to string array
func ReadStdin(r io.Reader) (input []string, err error) {
	b, err := io.ReadAll(r)
	if err != nil {
		return nil, err
	}
	if s := strings.TrimSpace(string(b)); len(s) > 0 {
		input = strings.Split(s, " ")
	}
	return input, nil
}