// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.

package main

import (
	"context"
	"decl/internal/data"
_	"decl/internal/config"
	"decl/internal/folio"
_	"decl/internal/resource"
_	"decl/internal/fan"
	"decl/internal/builtin"
_	"errors"
	"flag"
	"fmt"
_	"gopkg.in/yaml.v3"
	"io"
	"log/slog"
	"os"
	"decl/internal/client"
)

const (
	FormatYaml = "yaml"
	FormatJson = "json"
)

var (
	version string
	commit  string
	date    string
)

var Client *client.App = client.NewClient()

var GlobalOformat *string
var GlobalOutput string
var GlobalQuiet *bool

var ImportMerge *bool
var ImportResource *string

var ApplyDelete *bool

var ConfigPath string

var ConfigDoc data.Document = folio.DocumentRegistry.NewDocument("")

var ctx context.Context = context.Background()

type RunCommand func(cmd *flag.FlagSet, output io.Writer) error

type SubCommand struct {
	Name string
	Run  RunCommand
}

var jxSubCommands = []SubCommand{
	{
		Name: "diff",
		Run:  DiffSubCommand,
	},
	{
		Name: "apply",
		Run:  ApplySubCommand,
	},
	{
		Name: "import",
		Run:  ImportSubCommand,
	},
	{
		Name: "config",
		Run:  ConfigSubCommand,
	},
}

func VersionUsage() {
	fmt.Println("jx")
	fmt.Printf("version: %s\n", version)
	fmt.Printf("commit: %s\n", commit)
	fmt.Printf("date: %s\n", date)
}

func LoggerConfig() {
	var programLevel = new(slog.LevelVar)
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: programLevel}))
	slog.SetDefault(logger)
	if debugLogging, ok := os.LookupEnv("JX_DEBUG"); ok && debugLogging != "" {
		programLevel.Set(slog.LevelDebug)
	} else {
		programLevel.Set(slog.LevelError)
	}
}

func ConfigSubCommand(cmd *flag.FlagSet, output io.Writer) (err error) {
	if err = cmd.Parse(os.Args[2:]); err != nil {
		return
	}

	if err = Client.SetOutput(GlobalOutput); err == nil {
		if configErr := Client.SystemConfiguration(ConfigPath); configErr != nil {
			slog.Info("Main.Import - SystemConfiguration", "config", ConfigPath, "error", configErr)
		}
		err = Client.ConfigCmd(cmd.Args(), true)
	}

	return
}

func ImportSubCommand(cmd *flag.FlagSet, output io.Writer) (err error) {
	ImportResource = cmd.String("resource", "", "(uri) Add a resource to the document.")
	ImportMerge = cmd.Bool("merge", false, "Merge resources into a single document.")
	e := cmd.Parse(os.Args[2:])
	if e != nil { // returns ErrHelp
		return e
	}
	if err = Client.SetOutput(GlobalOutput); err == nil {
		if configErr := Client.SystemConfiguration(ConfigPath); configErr != nil {
			slog.Info("Main.Import - SystemConfiguration", "config", ConfigPath, "error", configErr)
		}

		err = Client.ImportCmd(ctx, cmd.Args(), *ImportResource, *GlobalQuiet, *ImportMerge)
	}
	return
}

func ApplySubCommand(cmd *flag.FlagSet, output io.Writer) (err error) {
	ApplyDelete = cmd.Bool("delete", false, "Delete resources defined in the available documents.")
	if e := cmd.Parse(os.Args[2:]); e != nil {
		return e
	}

	if err = Client.SetOutput(GlobalOutput); err == nil {
		if configErr := Client.SystemConfiguration(ConfigPath); configErr != nil {
			slog.Info("Main.Import - SystemConfiguration", "config", ConfigPath, "error", configErr)
		}

		err = Client.ApplyCmd(ctx, cmd.Args(), *GlobalQuiet, *ApplyDelete)
	}
	return
}

func DiffSubCommand(cmd *flag.FlagSet, output io.Writer) (err error) {
	if e := cmd.Parse(os.Args[2:]); e != nil {
		return e
	}
	
	return Client.DiffCmd(cmd.Args())
}


func main() {
	LoggerConfig()

	if len(os.Args) < 2 {
		fmt.Println("expected subcommands: diff, apply, import")
		os.Exit(1)
	}

	DefaultConfigurations, configErr := builtin.BuiltInDocuments()
	if configErr != nil {
		slog.Warn("Failed loading default configuration", "error", configErr)
	}

	ConfigDoc.AppendConfigurations(DefaultConfigurations)

	for _, subCmd := range jxSubCommands {
		cmdFlagSet := flag.NewFlagSet(subCmd.Name, flag.ExitOnError)

		cmdFlagSet.StringVar(&ConfigPath, "config", "/etc/jx/conf.d", "Config file path")
		cmdFlagSet.StringVar(&ConfigPath, "c", "/etc/jx/conf.d", "Config file path")

		GlobalOformat = cmdFlagSet.String("oformat", "yaml", "Output serialization format")
		cmdFlagSet.StringVar(&GlobalOutput, "output", "-", "Output target (default stdout)")
		cmdFlagSet.StringVar(&GlobalOutput, "o", "-", "Output target (default stdout)")
		GlobalQuiet = cmdFlagSet.Bool("quiet", false, "Generate terse output.")

		switch subCmd.Name {
		case "diff":
			cmdFlagSet.Usage = func() {
				fmt.Println("jx diff source [source2]")
				cmdFlagSet.PrintDefaults()
				VersionUsage()
			}
		case "apply":
			cmdFlagSet.Usage = func() {
				fmt.Println("jx diff source [source2]")
				cmdFlagSet.PrintDefaults()
				VersionUsage()
			}
		case "import":
			cmdFlagSet.Usage = func() {
				fmt.Println("jx import source...")
				cmdFlagSet.PrintDefaults()
				VersionUsage()
			}
		case "config":
			cmdFlagSet.Usage = func() {
				fmt.Println("jx config source...")
				cmdFlagSet.PrintDefaults()
				VersionUsage()
			}
		}
		slog.Info("CLI", "cmd", subCmd.Name)
		if os.Args[1] == subCmd.Name {
			if e := subCmd.Run(cmdFlagSet, os.Stdout); e != nil {
				slog.Error("Failed running command", "command", os.Args[1], "error", e)
				os.Exit(1)
			}
			return
		}
	}
	flag.PrintDefaults()
	VersionUsage()
	os.Exit(1)
}