/*
Copyright © 2026 Thomas von Dein

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cmd

import (
	"context"
	"fmt"
	golog "log"
	"os"
	"runtime/pprof"
	"strings"

	"codeberg.org/scip/esctl/assets"
	"codeberg.org/scip/esctl/pkg/cfg"
	"codeberg.org/scip/esctl/pkg/es"
	"codeberg.org/scip/esctl/pkg/log"
	"codeberg.org/scip/esctl/pkg/printer"

	markdown "github.com/MichaelMure/go-term-markdown"
	"github.com/urfave/cli/v3"
)

const (
	versionFmt = `esctl version: %s
  build: %s
  branch: %s
  commit: %s
  go version: %s
  API Version: %s
`

	jsonPathUsage = `jsonPath usage:

name.last          >> "Anderson"
age                >> 37
children           >> ["Sara","Alex","Jack"]
children.#         >> 3
children.1         >> "Alex"
child*.2           >> "Jack"
c?ildren.0         >> "Sara"
fav\.movie         >> "Deer Hunter"
friends.#.first    >> ["Dale","Roger","Jane"]
friends.1.last     >> "Craig"

You can also  query an array for  the first match by  using #(...), or
find all matches  with #(...)#. Queries support the ==,  !=, <, <=, >,
>= comparison operators  and the simple pattern matching  % (like) and
!% (not like) operators. Eg:

friends.#(last=="Murphy").first    >> "Dale"
friends.#(last=="Murphy")#.first   >> ["Dale","Jane"]
friends.#(age>45)#.last            >> ["Craig","Murphy"]
friends.#(first%"D*").last         >> "Murphy"
friends.#(first!%"D*").last        >> "Craig"
friends.#(nets.#(=="fb"))#.first   >> ["Dale","Roger"]

To extract more than one field, use:

{"ns":source.namespace_name,"time":source.@timestamp} >>

{
  "ns": "3f80316965c64405-275a75782e984bcc8d82",
  "time": "2026-06-10T04:23:38.914080361+00:00"
}
{
  "ns": "3f80316965c64405-f0e1dcef668e45bb9afd",
  "time": "2026-06-10T09:39:00.554892542+00:00"
}


Documentation: https://github.com/tidwall/gjson/blob/master/SYNTAX.md`
)

func Finish(err error) int {
	if err != nil {
		fmt.Fprintln(os.Stderr, "Error: ", err.Error())

		return 1
	}

	return 0
}

func Main() int {
	conf := cfg.NewConfig()

	cmd := &cli.Command{
		Name:                  "esctl",
		Usage:                 "manage elasticsearch from cli",
		EnableShellCompletion: true,

		Flags: []cli.Flag{
			&cli.BoolFlag{
				Name:        "debug",
				Aliases:     []string{"d"},
				Value:       false,
				Usage:       "enable debugging",
				Sources:     cli.EnvVars("ES_DEBUG"),
				Destination: &conf.Debug,
			},
			&cli.BoolFlag{
				Name:        "debug-http",
				Value:       false,
				Usage:       "enable HTTP debugging",
				Destination: &conf.DebugHTTP,
			},
			&cli.BoolFlag{
				Name:        "align-ints",
				Aliases:     []string{"I"},
				Value:       false,
				Usage:       "right align integers in tabular output",
				Destination: &conf.AlignInts,
			},
			&cli.StringFlag{
				Name:        "config",
				Aliases:     []string{"c"},
				Value:       "",
				Usage:       "config file",
				Sources:     cli.EnvVars("ES_CONFIG"),
				Destination: &conf.ConfigFile,
			},
			&cli.StringFlag{
				Name:        "cluster",
				Aliases:     []string{"C"},
				Value:       "",
				Usage:       "cluster alias to work with",
				Destination: &conf.CurrentCluster,
			},
			&cli.StringFlag{
				Name:        "output",
				Aliases:     []string{"o"},
				Value:       "",
				Usage:       "output mode (tsv, csv, json, yaml) default: tsv",
				Destination: &conf.Output,
			},
			&cli.StringFlag{
				Name:        "profile-file",
				Usage:       "golang profiler output file",
				Destination: &conf.ProfileFile,
				Hidden:      true,
			},
		},

		Commands: []*cli.Command{
			Api(conf),
			Ccr(conf),
			Cluster(conf),
			Datastream(conf),
			Doc(conf),
			Ilm(conf),
			Index(conf),
			License(conf),
			Node(conf),
			Roles(conf),
			Search(conf),
			SearchQL(conf),
			Shard(conf),
			Snapshot(conf),
			Task(conf),
			Version(conf),
			Debug(conf),
			HelpJsonPath(conf),
			HelpUsage(conf),
			HelpEsQl(conf),
		},

		Before: func(ctx context.Context, cmd *cli.Command) (context.Context, error) {
			if err := conf.Init(); err != nil {
				if len(os.Args) > 1 {
					return nil, err
				} else {
					fmt.Println(cmd.UsageText)

					return nil, nil
				}
			}

			log.Init(conf)

			if conf.ProfileFile != "" {
				// enable  cpu profiling. Do  NOT use q  to stop the  game but
				// close the window to get a profile
				fd, err := os.Create(conf.ProfileFile)
				if err != nil {
					return nil, err
				}
				defer func() {
					if err := fd.Close(); err != nil {
						golog.Fatal(err)
					}
				}()

				if err := pprof.StartCPUProfile(fd); err != nil {
					golog.Fatal(err)
				}

				defer pprof.StopCPUProfile()
			}

			return nil, nil
		},
	}

	return Finish(cmd.Run(context.Background(), os.Args))
}

func HelpJsonPath(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:  "help-jsonpath",
		Usage: "show jsonpath help",

		Action: func(ctx context.Context, cmd *cli.Command) error {
			_, err := fmt.Println(jsonPathUsage)

			return err
		},
	}
}

func HelpEsQl(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:  "help-esql",
		Usage: "show esql help",

		Action: func(ctx context.Context, cmd *cli.Command) error {
			assets.LoadEsql()

			width := cfg.GetTermWidth()
			printer.Pager("esql cheat sheet", string(markdown.Render(assets.EsQlCheatSheet, width, cfg.DefaultMargin)))

			return nil
		},
	}
}

func Version(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:  "version",
		Usage: "show esctl version information",

		Action: func(ctx context.Context, cmd *cli.Command) error {
			_, err := fmt.Printf(versionFmt,
				cfg.Version, cfg.BUILD, cfg.BRANCH, cfg.COMMIT, cfg.GOVERSION, cfg.APIVERSION)

			return err
		},
	}
}

func Debug(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:  "debug",
		Usage: "developer only",

		Flags: []cli.Flag{
			&cli.StringFlag{
				Name:        "index",
				Usage:       "index to search within",
				Sources:     cli.EnvVars("ES_INDEX"),
				Destination: &conf.Index,
				Aliases:     []string{"i"},
			},
		},

		Action: func(ctx context.Context, cmd *cli.Command) error {
			return es.Debug(conf)
		},
	}
}

func HelpUsage(conf *cfg.Config) *cli.Command {
	return &cli.Command{
		Name:               "help-usage",
		Usage:              "show overview of all available commands",
		UsageText:          "help-usage [<filter>]",
		Aliases:            []string{"usage"},
		CustomHelpTemplate: addReference(`<filter> implies -f`),

		Flags: []cli.Flag{
			&cli.BoolFlag{
				Name:        "hidden",
				Usage:       "include hidden commands",
				Destination: &conf.Hidden,
				Aliases:     []string{"H"},
			},
			&cli.BoolFlag{
				Name:        "full-commands",
				Usage:       "show full commands",
				Destination: &conf.Force,
				Aliases:     []string{"f"},
			},
		},

		Action: func(ctx context.Context, cmd *cli.Command) error {
			maxCommandWidth := 0
			filter := cmd.Args().Get(0)

			if filter != "" {
				conf.Force = true
			}

			// first pass, determine max command width
			if err := walkVisible(conf, cmd.Root(), func(cmd *cli.Command) error {
				path := cmd.Path()
				size := len(path[len(path)-1])

				if conf.Force {
					path := strings.Join(cmd.Path(), " ")
					size = len(path)
				}

				if size > maxCommandWidth {
					maxCommandWidth = size
				}

				return nil
			}); err != nil {
				return err
			}

			maxCommandWidth += 4 // account for indent width

			// second pass, build tree
			return walkVisible(conf, cmd.Root(), func(cmd *cli.Command) error {
				path := cmd.Path()

				if filter != "" {
					if !strings.Contains(strings.Join(path, " "), filter) {
						return nil
					}
				}

				command := path[len(path)-1]
				if conf.Force {
					command = strings.Join(cmd.Path(), " ")
				}

				if len(path) == 1 || strings.HasSuffix(command, "help") {
					return nil
				}

				indent := strings.Repeat("  ", len(path[1:])-1)
				space := strings.Repeat(" ", maxCommandWidth-(len(command)+len(indent)))

				fmt.Printf("%s%s %s - %s\n", indent, command, space, cmd.Usage)

				return nil
			})
		},
	}
}

// copy of cmd.Walk() with the exception to skip hidden commands and its siblings
// see: https://github.com/urfave/cli/issues/2372
func walkVisible(conf *cfg.Config, cmd *cli.Command, fn func(*cli.Command) error) error {
	if fn == nil {
		return nil
	}

	if !conf.Hidden && cmd.Hidden {
		return nil
	}

	if err := fn(cmd); err != nil {
		return err
	}

	for _, sub := range cmd.Commands {
		if err := walkVisible(conf, sub, fn); err != nil {
			return err
		}
	}

	return nil
}