package discord

import (
	"errors"
	"fmt"

	"github.com/bwmarrin/discordgo"
	"gitlab.com/whom/bingobot/internal/logging"
)

type Session struct {
	connected bool
	s         *discordgo.Session
}

var (
	session *Session

	ErrNotConnected = errors.New("session not connected")
)

func Connect(token string) error {
	// throw away err because discordgo.New() actually can't return an error.
	// https://github.com/bwmarrin/discordgo/blob/da9e191069d09e1b467145f5758d9b11cb9cca0d/discord.go#L32
	s, _ := discordgo.New("Bot " + token)

	session = &Session{
		s: s,
	}

	addHandlers()

	err := session.s.Open()

	if err != nil {
		return fmt.Errorf("failed to open discord session: %s", err)
	}

	return nil
}

func Close() {
	err := session.s.Close()

	if err != nil {
		// don't bubble up this error because we can't do anything about it and
		// the bot is exiting anyway.
		logging.Error("could not close discord session gracefully", "type", "error", "error", err)
	}

	session.connected = false
}

func Connected() bool {
	return session.connected
}

func User(uid string) (*discordgo.User, error) {
	if !Connected() {
		return nil, ErrNotConnected
	}

	return session.s.User(uid)
}