package main

import (
	"context"
	"crypto/sha512"
	"fmt"
	"regexp"
	"strings"

	"github.com/mattn/go-mastodon"
)

var (
	c = mastodon.NewClient(&mastodon.Config{
		Server:       Conf.Server,
		ClientID:     Conf.ClientID,
		ClientSecret: Conf.ClientSecret,
		AccessToken:  Conf.AccessToken,
	})

	ctx = context.Background()

	my_account, _ = c.GetAccountCurrentUser(ctx)
)

func RunBot() {
	events, err := c.StreamingUser(ctx)
	if err != nil {
		ErrorLogger.Println("Streaming")
	}

	followers, err := c.GetAccountFollowers(ctx, my_account.ID, &mastodon.Pagination{Limit: 60})
	if err != nil {
		ErrorLogger.Println("Fetch followers")
	}

	// Run bot
	for {
		notifEvent, ok := (<-events).(*mastodon.NotificationEvent)
		if !ok {
			continue
		}

		notif := notifEvent.Notification

		// New follower
		if notif.Type == "follow" {
			acct := notif.Status.Account.Acct

			if !exist_in_database(acct) { // Add to db and post welcome message
				InfoLogger.Printf("%s followed", acct)

				add_to_db(acct)
				InfoLogger.Printf("%s added to database", acct)

				message := fmt.Sprintf("%s @%s", Conf.WelcomeMessage, acct)
				_, err := postToot(message, "public")
				if err != nil {
					ErrorLogger.Println("Post welcome message")
				}
				InfoLogger.Printf("%s was welcomed", acct)
			}
		}

		// Read message
		if notif.Type == "mention" {
			acct := notif.Status.Account.Acct
			content := notif.Status.Content
			tooturl := notif.Status.URL

			for i := range followers {
				if acct == string(followers[i].Acct) { // Follow check
					if notif.Status.Visibility == "public" { // Reblog toot
						if notif.Status.InReplyToID == nil { // Not boost replies
							// Duplicate protection
							content_hash := sha512.New()
							content_hash.Write([]byte(content))
							hash := fmt.Sprintf("%x", content_hash.Sum(nil))

							if !check_msg_hash(hash) {
								save_msg_hash(hash)
								InfoLogger.Printf("Hash of %s added to database", tooturl)
							} else {
								WarnLogger.Printf("%s is a duplicate and not boosted", tooturl)
								break
							}

							// Add to db if needed
							if !exist_in_database(acct) {
								add_to_db(acct)
								InfoLogger.Printf("%s added to database", acct)
							}

							// Message order
							if check_order(acct) < Conf.Order_limit {
								if check_ticket(acct) > 0 { // Message limit
									take_ticket(acct)
									InfoLogger.Printf("Ticket of %s was taken", acct)

									count_order(acct)
									InfoLogger.Printf("Order of %s was counted", acct)

									c.Reblog(ctx, notif.Status.ID)
									InfoLogger.Printf("Toot %s of %s was rebloged", tooturl, acct)
								} else {
									WarnLogger.Printf("%s haven't tickets", acct)
								}
							} else {
								WarnLogger.Printf("%s order limit", acct)
							}
						} else {
							WarnLogger.Printf("%s is reply and not boosted", tooturl)
						}
					} else if notif.Status.Visibility == "direct" { // Admin commands
						for y := 0; y < len(Conf.Admins); y++ {
							if acct == Conf.Admins[y] {
								recmd := regexp.MustCompile(`<[^>]+>`)
								command := recmd.ReplaceAllString(content, "")
								args := strings.Split(command, " ")

								if len(args) == 3 {
									mID := mastodon.ID((args[2]))

									switch args[1] {
									case "unboost":
										c.Unreblog(ctx, mID)
										WarnLogger.Printf("%s was unrebloged", mID)
									case "delete":
										c.DeleteStatus(ctx, mID)
										WarnLogger.Printf("%s was deleted", mID)
									}
								}
							} else {
								continue
							}
						}
					} else {
						WarnLogger.Printf("%s is not public toot and not boosted", tooturl)
						break
					}
				}
				if i == len(followers)-1 { // Notify user
					if got_notice(acct) == 0 {
						if !exist_in_database(acct) {
							add_to_db(acct)
							InfoLogger.Printf("%s added to database", acct)
						}

						message := fmt.Sprintf("@%s %s", acct, Conf.NotFollowedMessage)
						_, err := postToot(message, "direct")
						if err != nil {
							ErrorLogger.Printf("Notify %s", acct)
						}
						InfoLogger.Printf("%s has been notified", acct)

						mark_notice(acct)
						InfoLogger.Printf("%s marked notification in database", acct)
					}
				}
			}
		}
	}
}