package modules

import (
	"fmt"
	"runtime"
	"strconv"
	"strings"

	"github.com/bwmarrin/discordgo"

	"TerraOceanBot/discord/config"
)

func enforceDM(s *discordgo.Session, m *discordgo.MessageCreate) bool {
	if m.GuildID != "" {
		//This command can only be used in DM to protect the invite creator.
		s.ChannelMessageDelete(m.ChannelID, m.ID)
		s.ChannelMessageSend(
			m.ChannelID,
			m.Author.Mention()+"，这个指令只能在私信中使用。\n"+m.Author.Mention()+", this command can only be used in DM.",
		)
		return false
	}
	return true
}

func membersOnly(s *discordgo.Session, m *discordgo.MessageCreate) bool {
	member, err := s.GuildMember(config.GuildID, m.Author.ID)
	if err != nil {
		s.ChannelMessageSend(
			m.ChannelID,
			m.Author.Mention()+"，请在成为会员后才使用这个指令。\n"+m.Author.Mention()+", please use this command after you become a member.",
		)
		return false
	}
	for _, v := range member.Roles {
		if v == config.MemberRoleID {
			return true
		}
	}
	s.ChannelMessageSend(
		m.ChannelID,
		m.Author.Mention()+"，请在成为会员后才使用这个指令。\n"+m.Author.Mention()+", please use this command after you become a member.",
	)
	return false
}

func nonMembersOnly(s *discordgo.Session, m *discordgo.MessageCreate) bool {
	member, err := s.GuildMember(config.GuildID, m.Author.ID)
	if err != nil {
		return false
	}
	for _, v := range member.Roles {
		if v == config.MemberRoleID {
			s.ChannelMessageSend(
				m.ChannelID,
				m.Author.Mention()+"，该指令只能被非会员使用。\n"+m.Author.Mention()+", this command can only be used by non-member.",
			)
			return false
		}
	}
	return true
}

func sendPrivateMessage(s *discordgo.Session, recipient, message string) error {
	channel, err := s.UserChannelCreate(recipient)
	if err != nil {
		return err
	}
	_, err = s.ChannelMessageSend(channel.ID, message)
	return err
}

func auditLog(s *discordgo.Session, message string) {
	_, err := s.ChannelMessageSend(config.AuditChannel, message)
	if err != nil {
		fmt.Println("==Audit Log==")
		fmt.Println(message)
		fmt.Println(err)
	}
}

func enforceArgumentCount(usage string, count int, passOn CommandHandler) CommandHandler {
	return func(s *discordgo.Session, m *discordgo.MessageCreate, command []string) {
		if len(command) < count {
			s.ChannelMessageSendEmbed(
				m.ChannelID,
				newEmbed().SetTitle(config.UsageTitle).SetDescription(usage).SetColour(config.UsageColour).Build(),
			)
			return
		}
		command[count-1] = strings.Join(command[count-1:], " ")
		passOn(s, m, command[:count])
	}
}

func sendError(s *discordgo.Session, channelID string, err error) {
	stackCache := make([]byte, 512)
	count := runtime.Stack(stackCache, false)
	stack := string(stackCache[:count])
	if count == 512 {
		stack += "..."
	}
	initNewErrorEmbed(err.Error()).AddField(config.ErrorStack, stack).Send(s, channelID)
}

func formatFloat(n float64, precision int) string {
	return strconv.FormatFloat(n, 'f', precision, 64)
}