package main

import (
	"context"
	"fmt"
	"github.com/oklahomer/go-sarah/v4"
	"github.com/oklahomer/go-sarah/v4/slack"
	
	"os"
	"os/signal"
	"syscall"
	
	// Below packages register commands in their init().
	// Importing with blank identifier will do the magic.
	_ "guess"
	_ "hello"
)

func main() {
	// Setup Slack adapter
	setupSlack()
	
	// Prepare go-sarah's core context.
	ctx, cancel := context.WithCancel(context.Background())

	// Run
	config := sarah.NewConfig()
	err := sarah.Run(ctx, config)
	if err != nil {
		panic(fmt.Errorf("failed to run: %s", err.Error()))
	}
	
	// Stop when signal is sent.
	c := make(chan os.Signal, 1)
   	signal.Notify(c, syscall.SIGTERM)
   	select {
   	case <-c:
   		cancel()
   
   	}
}

func setupSlack() {
	// Setup slack adapter.
	slackConfig := slack.NewConfig()
	slackConfig.Token = "REPLACE THIS"
	adapter, err := slack.NewAdapter(slackConfig, slack.WithRTMPayloadHandler(slack.DefaultRTMPayloadHandler))
	if err != nil {
		panic(fmt.Errorf("faileld to setup Slack Adapter: %s", err.Error()))
	}

	// Setup optional storage so conversational context can be stored.
	cacheConfig := sarah.NewCacheConfig()
	storage := sarah.NewUserContextStorage(cacheConfig)

	// Setup Bot with slack adapter and default storage.
	bot := sarah.NewBot(adapter, sarah.BotWithStorage(storage))
	
	sarah.RegisterBot(bot)
}

package guess

import (
	"context"
	"github.com/oklahomer/go-sarah/v4"
	"github.com/oklahomer/go-sarah/v4/slack"
	"math/rand"
	"strconv"
	"strings"
	"time"
)

func init() {
	sarah.RegisterCommandProps(props)
}

var props = sarah.NewCommandPropsBuilder().
	BotType(slack.SLACK).
	Identifier("guess").
	Instruction("Input .guess to start a game.").
	MatchFunc(func(input sarah.Input) bool {
		return strings.HasPrefix(strings.TrimSpace(input.Message()), ".guess")
	}).
	Func(func(ctx context.Context, input sarah.Input) (*sarah.CommandResponse, error) {
		// Generate answer value at the very beginning.
		rand.Seed(time.Now().UnixNano())
		answer := rand.Intn(10)

		// Let user guess the right answer.
		return slack.NewResponse(input, "Input number.", slack.RespWithNext(func(c context.Context, i sarah.Input) (*sarah.CommandResponse, error){
			return guessFunc(c, i, answer)
		}))
	}).
	MustBuild()

func guessFunc(_ context.Context, input sarah.Input, answer int) (*sarah.CommandResponse, error) {
	// For handiness, create a function that recursively calls guessFunc until user input right answer.
	retry := func(c context.Context, i sarah.Input) (*sarah.CommandResponse, error) {
		return guessFunc(c, i, answer)
	}

	// See if user inputs valid number.
	guess, err := strconv.Atoi(strings.TrimSpace(input.Message()))
	if err != nil {
		return slack.NewResponse(input, "Invalid input format.", slack.RespWithNext(retry))
	}

	// If guess is right, tell user and finish current user context.
	// Otherwise let user input next guess with bit of a hint.
	if guess == answer {
		return slack.NewResponse(input, "Correct!")
	} else if guess > answer {
		return slack.NewResponse(input, "Smaller!", slack.RespWithNext(retry))
	} else {
		return slack.NewResponse(input, "Bigger!", slack.RespWithNext(retry))
	}
}

package hello

import (
	"context"
	"github.com/oklahomer/go-sarah/v4"
	"github.com/oklahomer/go-sarah/v4/slack"
	"strings"
)

func init() {
    sarah.RegisterCommand(slack.SLACK, &command{})	
}

type command struct {
}

var _ sarah.Command = (*command)(nil)

func (hello *command) Identifier() string {
	return "hello"
}

func (hello *command) Execute(_ context.Context, i sarah.Input) (*sarah.CommandResponse, error) {
	return slack.NewResponse(i, "Hello!")
}

func (hello *command) Instruction(input *sarah.HelpInput) string {
	if 12 < input.SentAt().Hour() {
		// This command is only active in the morning.
		// Do not show instruction in the afternoon.
		return ""
	}
	return "Input .hello to greet"
}

func (hello *command) Match(input sarah.Input) bool {
	return strings.TrimSpace(input.Message()) == ".hello"
}