package main

import (
	"context"
	"flag"
	"fmt"
	"os"
	"io/ioutil"
	"strings"
)

func handleIndexCommand() {
	if len(os.Args) < 3 {
		fmt.Fprintf(os.Stderr, "%s index: subcommand missing\n", os.Args[0])
		printIndexUsage()
		os.Exit(1)
	}

	subcmd := strings.ToLower(os.Args[2])
	switch subcmd {
	case "list":
		listcmd := flag.NewFlagSet("index list", flag.ExitOnError)
		listcmd.SetOutput(os.Stdout)
		cfgpath := listcmd.String("config", "", "path to configuration")
		listcmd.Parse(os.Args[3:])

		cfg := LoadConfig(*cfgpath)
		es := ClientFromConfig(cfg.Elastic)

		indexes, err := es.IndexNames()
		if err != nil {
			fmt.Fprintf(os.Stderr, "elastic error: %s\n", err.Error())
			os.Exit(1)
		}

		for _, index := range indexes {
			fmt.Printf("%s\n", index)
		}

	case "delete":
		deletecmd := flag.NewFlagSet("index delete", flag.ExitOnError)
		deletecmd.SetOutput(os.Stdout)
		cfgpath := deletecmd.String("config", "", "path to configuration")
		iname := deletecmd.String("name", "", "(required) index name to delete")
		deletecmd.Parse(os.Args[3:])

		if *iname == "" {
			fmt.Fprintf(os.Stderr, "name parameter is required for index delete\n")
			deletecmd.PrintDefaults()
			os.Exit(1)
		}

		cfg := LoadConfig(*cfgpath)
		es := ClientFromConfig(cfg.Elastic)

		_, err := es.DeleteIndex(*iname).Do(context.Background())
		if err != nil {
			fmt.Fprintf(os.Stderr, "elastic error: %s\n", err.Error())
			os.Exit(1)
		}

	case "create":
		createcmd := flag.NewFlagSet("index create", flag.ExitOnError)
		createcmd.SetOutput(os.Stdout)
		cfgpath := createcmd.String("config", "", "path to configuration")
		iname := createcmd.String("name", "", "(required) index name to create")
		bodystr := createcmd.String("body", "",
			"json string to use as body options during create")
		bodyfile := createcmd.String("bodyfile", "",
			"json file to use as body options during create")
		createcmd.Parse(os.Args[3:])

		if *iname == "" {
			fmt.Fprintf(os.Stderr, "name parameter is required for index create\n")
			createcmd.PrintDefaults()
			os.Exit(1)
		}

		if *bodystr != "" && *bodyfile != "" {
			fmt.Fprintf(os.Stderr,
				"body parameter cannot be used with bodyfile parameter\n")
			os.Exit(1)
		}

		body := *bodystr
		if *bodyfile != "" {
			raw, err := ioutil.ReadFile(*bodyfile)
			if err != nil {
				fmt.Fprintf(os.Stderr, "read error: %s\n", err.Error())
				os.Exit(1)
			}
			body = string(raw)
		}

		cfg := LoadConfig(*cfgpath)
		es := ClientFromConfig(cfg.Elastic)
		ics := es.CreateIndex(*iname)
		if body != "" {
			ics.Body(body)
		}
		_, err := ics.Do(context.Background())
		if err != nil {
			fmt.Fprintf(os.Stderr, "elastic error: %s\n", err.Error())
			os.Exit(1)
		}

	case "--help":
		printIndexUsage()
		os.Exit(0)

	default:
		fmt.Fprintf(os.Stderr, "%s: index '%s' is not a recognized subcommand\n",
			os.Args[0], os.Args[2])
		printDefaultUsage()
		os.Exit(1)
	}
}

func printIndexUsage() {
	fmt.Printf("Usage: %s index <subcommand> ... \n", os.Args[0])
	fmt.Printf("See '%s index <subcommand> --help' for information", os.Args[0])
	fmt.Printf(" on a specific command\n")
	fmt.Printf("valid subcommands:\n")
	fmt.Printf("    list      list indexes\n")
	fmt.Printf("    delete    delete index\n")
	fmt.Printf("    create    create index\n")
}