package main

import (
	"context"
	"flag"
	"log/slog"
	"os"
	"os/signal"
	"syscall"

	"github.com/disgoorg/disgo"
	"github.com/disgoorg/disgo/bot"
	"github.com/disgoorg/disgo/discord"
	"github.com/disgoorg/disgo/events"
	"github.com/disgoorg/disgo/gateway"
	"github.com/disgoorg/snowflake/v2"

	"github.com/elisiei/unbot/config"
	"github.com/elisiei/unbot/db"
	"github.com/elisiei/unbot/features"
)

func main() {
	configPath := flag.String("config", "config.toml", "path to config file")
	flag.Parse()

	cfg, err := config.Load(*configPath)
	if err != nil {
		slog.Error("failed to load config", slog.Any("err", err))
		os.Exit(1)
	}

	database, err := db.Open("unbot.db")
	if err != nil {
		slog.Error("failed to open database", slog.Any("err", err))
		os.Exit(1)
	}

	dict := features.NewDictionary(database, cfg.Features.Dictionary.Enabled)

	starboard, err := features.NewStarboard(
		database,
		cfg.Features.Starboard.WebhookURL,
		cfg.Features.Starboard.ChannelID,
		cfg.Features.Starboard.Threshold,
		cfg.Features.Starboard.Enabled,
	)
	if err != nil {
		slog.Error("failed to create starboard", slog.Any("err", err))
		os.Exit(1)
	}

	client, err := disgo.New(cfg.Bot.Token,
		bot.WithGatewayConfigOpts(
			gateway.WithIntents(
				gateway.IntentGuilds,
				gateway.IntentGuildMessages,
				gateway.IntentMessageContent,
				gateway.IntentGuildMessageReactions,
			),
		),
		bot.WithEventListenerFunc(func(e *events.AutocompleteInteractionCreate) {
			if cfg.Features.Dictionary.Enabled {
				dict.HandleAutocomplete(e)
			}
		}),
		bot.WithEventListenerFunc(func(e *events.GuildMessageReactionAdd) {
			if cfg.Features.Starboard.Enabled {
				starboard.HandleReactionAdd(e)
			}
		}),
		bot.WithEventListenerFunc(func(e *events.GuildMessageReactionRemove) {
			if cfg.Features.Starboard.Enabled {
				starboard.HandleReactionRemove(e)
			}
		}),
	)
	if err != nil {
		slog.Error("failed to create client", slog.Any("err", err))
		os.Exit(1)
	}

	xdTracker := features.NewXDTracker(
		database,
		client,
		snowflake.ID(cfg.Bot.GuildID),
		cfg.Features.XDTracker.Enabled,
	)

	client.AddEventListeners(
		bot.NewListenerFunc(func(e *events.ApplicationCommandInteractionCreate) {
			handleCommand(e, dict, xdTracker, cfg)
		}),
		bot.NewListenerFunc(func(e *events.MessageCreate) {
			if cfg.Features.XDTracker.Enabled {
				xdTracker.HandleMessage(e)
			}
		}),
	)

	iconChanger := features.NewIconChanger(
		client,
		cfg.Bot.GuildID,
		cfg.Features.IconChanger.ChannelID,
		cfg.Features.IconChanger.Interval,
		cfg.Features.IconChanger.Enabled,
	)
	client.AddEventListeners(bot.NewListenerFunc(func(e *events.MessageCreate) {
		iconChanger.HandleMessage(e)
	}))
	iconChanger.Start()

	guildID := snowflake.ID(cfg.Bot.GuildID)
	var commands []discord.ApplicationCommandCreate
	if cfg.Features.Dictionary.Enabled {
		commands = append(commands, dict.Command())
	}
	if cfg.Features.XDTracker.Enabled {
		commands = append(commands, xdTracker.Command())
	}

	if len(commands) > 0 {
		if _, err := client.Rest.SetGuildCommands(client.ApplicationID, guildID, commands); err != nil {
			slog.Error("failed to register commands", slog.Any("err", err))
			os.Exit(1)
		}
		slog.Info("registered commands")
	}

	if err := client.OpenGateway(context.TODO()); err != nil {
		slog.Error("failed to open gateway", slog.Any("err", err))
		os.Exit(1)
	}

	slog.Info("bot is running")

	go xdTracker.BackfillHistory()
	go iconChanger.BackfillHistory()

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

	iconChanger.Stop()
	client.Close(context.TODO())
}

func handleCommand(e *events.ApplicationCommandInteractionCreate, dict *features.Dictionary, xd *features.XDTracker, cfg *config.Config) {
	data := e.SlashCommandInteractionData()

	switch data.CommandName() {
	case "dict":
		if !cfg.Features.Dictionary.Enabled {
			return
		}
		opts := data.All()
		if len(opts) == 0 {
			return
		}
		subCmd := opts[0].Name
		switch subCmd {
		case "add":
			dict.HandleAdd(e)
		case "get":
			dict.HandleGet(e)
		case "remove":
			dict.HandleRemove(e)
		case "list":
			dict.HandleList(e)
		}

	case "xd":
		if !cfg.Features.XDTracker.Enabled {
			return
		}
		opts := data.All()
		if len(opts) == 0 {
			xd.HandleStats(e)
			return
		}
		subCmd := opts[0].Name
		switch subCmd {
		case "leaderboard":
			xd.HandleLeaderboard(e)
		case "stats":
			xd.HandleStats(e)
		}
	}
}