package modules

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

	"github.com/bwmarrin/discordgo"

	"TerraOceanBot/discord/config"
)

func enforceDM(passOn CommandHandler) CommandHandler {
	return func(s *discordgo.Session, m *discordgo.MessageCreate, command []string) {
		if m.GuildID != "" {
			//This command can only be used in DM to protect the invite creator.
			s.ChannelMessageDelete(m.ChannelID, m.ID)
			initNewEmbed(
				config.ErrorMustDMTitle,
				fmt.Sprintf(config.ErrorMustDMDescription, m.Author.ID, m.Author.ID),
				config.ErrorColour,
			).Send(s, m.ChannelID)
			return
		}
		passOn(s, m, command)
	}
}

func memberFilter(mustBeMember bool, passOn CommandHandler) CommandHandler {
	return func(s *discordgo.Session, m *discordgo.MessageCreate, command []string) {
		member, err := s.GuildMember(config.GuildID, m.Author.ID)
		if err != nil {
			initNewEmbed(config.PermissionErrorTitle, config.ErrorCannotFindMember, config.ErrorColour).
				Send(s, m.ChannelID)
			return
		}
		for _, v := range member.Roles {
			if v == config.MemberRoleID {
				if mustBeMember {
					passOn(s, m, command)
				} else {
					initNewEmbed(config.PermissionErrorTitle, config.ErrorMustNotBeMember, config.ErrorColour).
						Send(s, m.ChannelID)
				}
				return
			}
		}
		if mustBeMember {
			initNewEmbed(config.PermissionErrorTitle, config.ErrorMustBeMember, config.ErrorColour).
				Send(s, m.ChannelID)
		} else {
			passOn(s, m, command)
		}
	}
}

func enforceArgumentCount(usage string, count int, passOn CommandHandler) CommandHandler {
	return func(s *discordgo.Session, m *discordgo.MessageCreate, command []string) {
		if len(command) < count {
			initNewEmbed(config.UsageTitle, usage, config.UsageColour).
				Send(s, m.ChannelID)
			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 auditInfo(s *discordgo.Session, message string) {
	initNewEmbed(config.AuditInfoTitle, message, config.AuditInfoColour).
		Send(s, config.AuditChannel)
}

func auditError(s *discordgo.Session, sourceChannel string, err error) {
	if sourceChannel != "" {
		initNewErrorEmbed(config.InternalErrorDescription).
			Send(s, sourceChannel)
	}
	sendError(s, config.AuditChannel, err)
}

func auditErrorPM(s *discordgo.Session, sourceUser string, err error) {
	channel, channelErr := s.UserChannelCreate(sourceUser)
	if channelErr != nil {
		auditError(s, "", channelErr)
		auditError(s, "", err)
		return
	}
	auditError(s, channel.ID, err)
}

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