package main

import (
	"bytes"
	"database/sql"
	"encoding/json"
	"fmt"
	"log"
	"mime/multipart"
	"net/http"
	"os"
	"os/signal"
	"strconv"
	"strings"
	"syscall"
	"time"

	"github.com/BurntSushi/toml"
	"github.com/bwmarrin/discordgo"
	"github.com/lib/pq"
)

type UserResponse struct {
	ID           string   `json:"id"`
	Username     string   `json:"username"`
	Subscription bool     `json:"subscription"`
	Group        string   `json:"group"`
	Expiration   string   `json:"expiration"`
	Versions     []string `json:"versions"`
	PFP          string   `json:"pfp"`
	Message      int      `json:"message"`
}

var (
	config Config
	client *discordgo.Session
	db     *sql.DB
)

type Config struct {
	Discord  Discord  `toml:"discord"`
	Database Database `toml:"database"`
}

type Discord struct {
	Token      string   `toml:"token"`
	AppID      string   `toml:"appid"`
	GuildID    string   `toml:"guildid"`
	CategoryID string   `toml:"category_id"`
	AdminRoles []string `toml:"admin_roles"`
}

type Database struct {
	Host     string `toml:"host"`
	Port     int    `toml:"port"`
	Name     string `toml:"name"`
	Username string `toml:"username"`
	Password string `toml:"password"`
}

func loadConfig(filename string) (Config, error) {
	var config Config
	_, err := toml.DecodeFile(filename, &config)
	return config, err
}

func connectDb(config Config) (*sql.DB, error) {
	connectionString := fmt.Sprintf(
		"host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
		config.Database.Host,
		config.Database.Port,
		config.Database.Username,
		config.Database.Password,
		config.Database.Name,
	)

	db, err := sql.Open("postgres", connectionString)
	if err != nil {
		return nil, fmt.Errorf("error connecting to the database: %v", err)
	}

	err = db.Ping()
	if err != nil {
		db.Close()
		return nil, fmt.Errorf("error pinging the database: %v", err)
	}

	log.Println("Successfully connected to the database.")
	return db, nil
}

func init() {
	var err error
	config, err = loadConfig("config.toml")
	if err != nil {
		log.Println("Error occurred whilst trying to load config:", err)
		return
	}

	client, err = discordgo.New("Bot " + config.Discord.Token)
	if err != nil {
		log.Println("Error initializing bot:", err)
		return
	}

	db, err = connectDb(config)
	if err != nil {
		log.Println("Error initializing db connection:", err)
		return
	}
}

func reset(userNickname, softwareType string) {
	log.Printf("Resetting %s for user %s\n", softwareType, userNickname)
}

func getUsernameFromMember(member *discordgo.Member) string {
	if member == nil {
		return "UnknownUser"
	}

	var userName string
	if member.Nick != "" {
		userName = member.Nick
	} else if member.User != nil && member.User.Username != "" {
		userName = member.User.Username
	} else {
		userName = "UnknownUser"
	}
	return userName
}

var (
	commands = []discordgo.ApplicationCommand{
		{
			Name:        "setup",
			Description: "Setup a channel for ticket creation",
			Options: []*discordgo.ApplicationCommandOption{
				{
					Type:        discordgo.ApplicationCommandOptionChannel,
					Name:        "channel",
					Description: "Channel for ticket creation",
					Required:    true,
				},
			},
		},
	}
	commandsHandlers = map[string]func(client *discordgo.Session, i *discordgo.InteractionCreate){
		"setup": func(client *discordgo.Session, i *discordgo.InteractionCreate) {
			hasAdminPermission := false
			for _, roleID := range config.Discord.AdminRoles {
				member, err := client.GuildMember(i.GuildID, i.Member.User.ID)
				if err != nil {
					log.Println("Error fetching member info:", err)
					return
				}

				for _, role := range member.Roles {
					if role == roleID {
						hasAdminPermission = true
						break
					}
				}
				if hasAdminPermission {
					break
				}
			}

			if !hasAdminPermission {
				err := client.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
					Type: discordgo.InteractionResponseChannelMessageWithSource,
					Data: &discordgo.InteractionResponseData{
						Content: "You do not have permission to run this command.",
						Flags:   discordgo.MessageFlagsEphemeral,
					},
				})
				if err != nil {
					log.Println("Error sending interaction response:", err)
				}
				return
			}

			channelOption := i.ApplicationCommandData().Options[0].ChannelValue(client)
			_, err := client.ChannelMessageSendComplex(channelOption.ID, &discordgo.MessageSend{
				Content: "Click the button below to request a HWID reset:",
				Components: []discordgo.MessageComponent{
					discordgo.ActionsRow{
						Components: []discordgo.MessageComponent{
							discordgo.Button{
								Label:    "Request Reset",
								Style:    discordgo.PrimaryButton,
								CustomID: "create_ticket",
							},
						},
					},
				},
			})
			if err != nil {
				log.Println("Error sending message to the specified channel:", err)
			}

			err = client.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
				Type: discordgo.InteractionResponseChannelMessageWithSource,
				Data: &discordgo.InteractionResponseData{
					Content: fmt.Sprintf("Setup completed! Request creation button has been added to %s", channelOption.Mention()),
				},
			})
			if err != nil {
				log.Println("Error sending interaction response:", err)
			}
		},
	}

	componentsHandlers = map[string]func(client *discordgo.Session, i *discordgo.InteractionCreate){
		"create_ticket": func(client *discordgo.Session, i *discordgo.InteractionCreate) {
			err := client.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
				Type: discordgo.InteractionResponseChannelMessageWithSource,
				Data: &discordgo.InteractionResponseData{
					Content: "For what would you like a HWID reset:",
					Components: []discordgo.MessageComponent{
						discordgo.ActionsRow{
							Components: []discordgo.MessageComponent{
								discordgo.SelectMenu{
									CustomID:    "select_software_type",
									Placeholder: "Choose which software",
									Options: []discordgo.SelectMenuOption{
										{
											Label:       "Vanity",
											Value:       "vanity",
											Description: "Request a vanity reset",
										},
										{
											Label:       "Mesa",
											Value:       "mesa",
											Description: "Request a mesa reset",
										},
									},
								},
							},
						},
					},
					Flags: discordgo.MessageFlagsEphemeral,
				},
			})
			if err != nil {
				log.Println("Error sending interaction response:", err)
			}
		},
		"select_software_type": func(client *discordgo.Session, i *discordgo.InteractionCreate) {
			selectedOption := i.MessageComponentData().Values[0]
			var softwareType string
			if selectedOption == "vanity" {
				softwareType = "Vanity"
			} else if selectedOption == "mesa" {
				softwareType = "Mesa"
			}

			categoryID := config.Discord.CategoryID
			guildID := i.GuildID
			userID := i.Member.User.ID
			userName := getUsernameFromMember(i.Member)

			if !canCreateTicket(userName, selectedOption) {
				err := client.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
					Type: discordgo.InteractionResponseChannelMessageWithSource,
					Data: &discordgo.InteractionResponseData{
						Content: fmt.Sprintf("You already have an active %s ticket. Please wait for the administrators to process it.", softwareType),
						Flags:   discordgo.MessageFlagsEphemeral,
					},
				})
				if err != nil {
					log.Println("Error sending interaction response:", err)
				}
				return
			}

			_, baseUrl := getTableNameAndBaseURL(selectedOption)
			userUID, _ := fetchUserID(userName, baseUrl)
			if userUID == 0 {
				err := client.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
					Type: discordgo.InteractionResponseChannelMessageWithSource,
					Data: &discordgo.InteractionResponseData{
						Content: fmt.Sprintf("Account not found for %s", softwareType),
						Flags:   discordgo.MessageFlagsEphemeral,
					},
				})
				if err != nil {
					log.Println("Error sending interaction response:", err)
				}
				return
			}

			channel, err := client.GuildChannelCreateComplex(guildID, discordgo.GuildChannelCreateData{
				Name:     fmt.Sprintf("reset-%s-%s", softwareType, userName),
				Type:     discordgo.ChannelTypeGuildText,
				ParentID: categoryID,
				PermissionOverwrites: []*discordgo.PermissionOverwrite{
					{
						ID:   guildID,
						Type: discordgo.PermissionOverwriteTypeRole,
						Deny: discordgo.PermissionViewChannel,
					},
				},
			})
			if err != nil {
				log.Println("Error creating hwid request channel:", err)
				return
			}

			for _, roleID := range config.Discord.AdminRoles {
				if roleID != "" {
					err := client.ChannelPermissionSet(channel.ID, roleID, discordgo.PermissionOverwriteTypeRole, discordgo.PermissionViewChannel|discordgo.PermissionSendMessages, 0)
					if err != nil {
						log.Printf("Error setting permissions for role %s: %v", roleID, err)
					}
				}

			}

			err = client.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
				Type: discordgo.InteractionResponseChannelMessageWithSource,
				Data: &discordgo.InteractionResponseData{
					Content: "Request submitted, you'll get a PM when it has been processed",
					Flags:   discordgo.MessageFlagsEphemeral,
				},
			})
			if err != nil {
				log.Println("Error sending interaction response:", err)
				return
			}

			_, err = client.ChannelMessageSendComplex(channel.ID, &discordgo.MessageSend{
				Content: fmt.Sprintf("Reset request by <@%s> for %s", userID, softwareType),
				Components: []discordgo.MessageComponent{
					discordgo.ActionsRow{
						Components: []discordgo.MessageComponent{
							discordgo.Button{
								Label:    "Accept",
								Style:    discordgo.PrimaryButton,
								CustomID: fmt.Sprintf("accept_%s_%s_%d", userID, softwareType, userUID),
							},
							discordgo.Button{
								Label:    "Decline",
								Style:    discordgo.DangerButton,
								CustomID: fmt.Sprintf("decline_%s_%s_%d", userID, softwareType, userUID),
							},
						},
					},
				},
			})
			if err != nil {
				log.Println("Error sending message to the ticket channel:", err)
			}
		},

		"accept": func(client *discordgo.Session, i *discordgo.InteractionCreate) {
			data := i.MessageComponentData().CustomID
			parts := strings.Split(data, "_")
			if len(parts) != 4 {
				log.Println("Invalid accept button custom ID")
				return
			}
			userID := parts[1]
			softwareType := parts[2]
			userUID, _ := strconv.Atoi(parts[3])

			member, err := client.GuildMember(i.GuildID, userID)
			if err != nil {
				log.Println("Error fetching member info:", err)
				return
			}
			userName := getUsernameFromMember(member)

			reset(userName, softwareType)
			tableName, _ := getTableNameAndBaseURL(strings.ToLower(softwareType))

			_, err = resetAndVerify(tableName, int(userUID))
			if err != nil {
				log.Println("Error resetting hwid:", err)
			}
			log.Printf("Reset the HWID of user %s with UID %d for %s", userName, userUID, softwareType)

			err = client.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
				Type: discordgo.InteractionResponseChannelMessageWithSource,
				Data: &discordgo.InteractionResponseData{
					Content: "Request accepted and processed.",
					Flags:   discordgo.MessageFlagsEphemeral,
				},
			})
			if err != nil {
				log.Println("Error sending interaction response:", err)
			}

			_, err = client.ChannelDelete(i.ChannelID)
			if err != nil {
				log.Println("Error deleting channel:", err)
			}

			dmChannel, err := client.UserChannelCreate(userID)
			if err != nil {
				log.Println("Error creating DM channel:", err)
				return
			}

			_, err = client.ChannelMessageSend(dmChannel.ID, fmt.Sprintf("Your reset request for %s has been accepted and processed.", softwareType))
			if err != nil {
				log.Println("Error sending DM:", err)
			}
		},

		"decline": func(client *discordgo.Session, i *discordgo.InteractionCreate) {
			data := i.MessageComponentData().CustomID
			parts := strings.Split(data, "_")
			if len(parts) != 4 {
				log.Println("Invalid decline button custom ID")
				return
			}
			userID := parts[1]

			err := client.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
				Type: discordgo.InteractionResponseChannelMessageWithSource,
				Data: &discordgo.InteractionResponseData{
					Content: "Request declined.",
					Flags:   discordgo.MessageFlagsEphemeral,
				},
			})
			if err != nil {
				log.Println("Error sending interaction response:", err)
			}

			_, err = client.ChannelDelete(i.ChannelID)
			if err != nil {
				log.Println("Error deleting channel:", err)
			}

			dmChannel, err := client.UserChannelCreate(userID)
			if err != nil {
				log.Println("Error creating DM channel:", err)
				return
			}

			_, err = client.ChannelMessageSend(dmChannel.ID, "Your reset request has been declined.")
			if err != nil {
				log.Println("Error sending DM:", err)
			}
		},
	}
)

func canCreateTicket(userName, softwareType string) bool {
	guildChannels, err := client.GuildChannels(config.Discord.GuildID)
	if err != nil {
		log.Println("Error fetching guild channels:", err)
		return false
	}

	for _, channel := range guildChannels {
		if channel.Type == discordgo.ChannelTypeGuildText && channel.ParentID == config.Discord.CategoryID {
			expectedName := fmt.Sprintf("reset-%s-%s", softwareType, userName)
			if channel.Name == expectedName {
				return false
			}
		}
	}

	return true
}

func getTableNameAndBaseURL(choice string) (string, string) {
	var tableName, baseURL string

	switch choice {
	case "vanity":
		tableName = "AuthUserData"
		baseURL = "http://vanitycheats.xyz/UserAuthentication.php"
	case "mesa":
		tableName = "AuthUserData-Mesachanger.com"
		baseURL = "http://mesachanger.com/UserAuthentication.php"
	default:
		fmt.Println("Invalid choice. Please choose 'vanity' or 'mesa'.")
	}

	return tableName, baseURL
}

func fetchUserID(username string, baseURL string) (int, error) {
	requestBody := &bytes.Buffer{}
	multiPartWriter := multipart.NewWriter(requestBody)
	err := multiPartWriter.WriteField("username", username)
	if err != nil {
		return 0, fmt.Errorf("error adding username field: %w", err)
	}
	multiPartWriter.Close()
	request, err := http.NewRequest("POST", baseURL, requestBody)
	if err != nil {
		return 0, fmt.Errorf("error creating request: %w", err)
	}
	request.Header.Set("Content-Type", multiPartWriter.FormDataContentType())
	client := &http.Client{
		Timeout: 10 * time.Second,
	}
	resp, err := client.Do(request)
	if err != nil {
		return 0, fmt.Errorf("error sending request: %w", err)
	}
	defer resp.Body.Close()
	var userResp UserResponse
	err = json.NewDecoder(resp.Body).Decode(&userResp)
	if err != nil {
		return 0, fmt.Errorf("error decoding JSON: %w", err)
	}
	uid, err := strconv.Atoi(userResp.ID)
	if err != nil {
		return 0, fmt.Errorf("error converting user ID: %w", err)
	}
	return uid, nil
}

func resetHWID(tableName string, uids []int) {
	query := fmt.Sprintf(`UPDATE public.%q
		SET "StorageIdentifier" = NULL, "BootIdentifier" = NULL
		WHERE "UID" = ANY($1)`, tableName)

	_, err := db.Exec(query, pq.Array(uids))
	if err != nil {
		log.Printf("Error resetting HWID: %v", err)
		return
	}
}

func resetAndVerify(tableName string, uid int) (bool, error) {
	var beforeHash string
	err := db.QueryRow(
		fmt.Sprintf(`SELECT MD5(CONCAT("StorageIdentifier", "BootIdentifier")) FROM public.%q WHERE "UID" = $1`, tableName),
		uid,
	).Scan(&beforeHash)
	if err != nil {
		if err == sql.ErrNoRows {
			return false, fmt.Errorf("no rows found for UID %d", uid)
		}
		return false, fmt.Errorf("error querying database: %v", err)
	}

	resetHWID(tableName, []int{uid})

	var afterHash string
	err = db.QueryRow(
		fmt.Sprintf(`SELECT MD5(CONCAT("StorageIdentifier", "BootIdentifier")) FROM public.%q WHERE "UID" = $1`, tableName),
		uid,
	).Scan(&afterHash)
	if err != nil {
		if err == sql.ErrNoRows {
			return false, fmt.Errorf("no rows found for UID %d after reset", uid)
		}
		return false, fmt.Errorf("error querying database after reset: %v", err)
	}

	return beforeHash != afterHash, nil
}

func main() {
	if client == nil {
		log.Println("Bot client is not initialized")
		return
	}

	client.AddHandler(func(client *discordgo.Session, r *discordgo.Ready) {
		log.Println("Bot is online")

		cmdIDs := make(map[string]string, len(commands))

		for _, cmd := range commands {
			rcmd, err := client.ApplicationCommandCreate(client.State.User.ID, config.Discord.GuildID, &cmd)
			if err != nil {
				log.Fatalf("Cannot create slash command %q: %v", cmd.Name, err)
			}

			cmdIDs[rcmd.ID] = rcmd.Name
		}
	})

	client.AddHandler(func(client *discordgo.Session, i *discordgo.InteractionCreate) {
		if i.Type == discordgo.InteractionApplicationCommand {
			if h, ok := commandsHandlers[i.ApplicationCommandData().Name]; ok {
				h(client, i)
			}
		} else if i.Type == discordgo.InteractionMessageComponent {
			customID := i.MessageComponentData().CustomID
			if h, ok := componentsHandlers[customID]; ok {
				h(client, i)
			} else if strings.HasPrefix(customID, "accept_") {
				componentsHandlers["accept"](client, i)
			} else if strings.HasPrefix(customID, "decline_") {
				componentsHandlers["decline"](client, i)
			}
		}
	})

	err := client.Open()
	if err != nil {
		log.Println("Error opening connection:", err)
		return
	}

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
	<-stop

	log.Println("Gracefully shutting down.")
	client.Close()

	if db != nil {
		db.Close()
	}
}