package domain

import (
	"fmt"
	"time"
)

type Group struct {
	ID                    string
	ServerID              string // Discord server ID
	ChannelGainedVillages string
	ChannelLostVillages   string
	ServerKey             string // Tribal Wars server key
	VersionCode           string
	CreatedAt             time.Time
}

type CreateGroupParams struct {
	serverID              string
	serverKey             string
	versionCode           string
	channelGainedVillages string
	channelLostVillages   string
}

func NewCreateGroupParams(serverID, versionCode, serverKey, channelGainedVillages, channelLostVillages string) (CreateGroupParams, error) {
	if serverID == "" {
		return CreateGroupParams{}, RequiredError{
			Field: "ServerID",
		}
	}

	if versionCode == "" {
		return CreateGroupParams{}, RequiredError{
			Field: "VersionCode",
		}
	}

	if serverKey == "" {
		return CreateGroupParams{}, RequiredError{
			Field: "ServerKey",
		}
	}

	return CreateGroupParams{
		serverID:              serverID,
		serverKey:             serverKey,
		versionCode:           versionCode,
		channelGainedVillages: channelGainedVillages,
		channelLostVillages:   channelLostVillages,
	}, nil
}

func (c CreateGroupParams) ServerID() string {
	return c.serverID
}

func (c CreateGroupParams) VersionCode() string {
	return c.versionCode
}

func (c CreateGroupParams) ServerKey() string {
	return c.serverKey
}

func (c CreateGroupParams) ChannelGainedVillages() string {
	return c.channelGainedVillages
}

func (c CreateGroupParams) ChannelLostVillages() string {
	return c.channelLostVillages
}

type UpdateGroupParams struct {
	ChannelGainedVillages NullString
	ChannelLostVillages   NullString
	ServerKey             NullString
	VersionCode           NullString
}

func (u UpdateGroupParams) IsZero() bool {
	return !u.ChannelGainedVillages.Valid &&
		!u.ChannelLostVillages.Valid &&
		!u.VersionCode.Valid &&
		!u.ServerKey.Valid
}

type ListGroupsParams struct {
	ServerIDs []string
}

type GroupLimitReachedError struct {
	Current int // current number of groups
	Limit   int // maximum number of groups
}

func (e GroupLimitReachedError) Error() string {
	return fmt.Sprintf("group limit has been reached (%d/%d)", e.Current, e.Limit)
}

func (e GroupLimitReachedError) UserError() string {
	return e.Error()
}

func (e GroupLimitReachedError) Code() ErrorCode {
	return ErrorCodeValidationError
}

type GroupNotFoundError struct {
	ID string
}

func (e GroupNotFoundError) Error() string {
	return fmt.Sprintf("group (ID=%s) not found", e.ID)
}

func (e GroupNotFoundError) UserError() string {
	return e.Error()
}

func (e GroupNotFoundError) Code() ErrorCode {
	return ErrorCodeEntityNotFound
}