import type { NullableId, Params, ServiceInterface } from '@feathersjs/feathers';

import type { Application } from '../../declarations';
import wildDuckClient from '../../clients/wildduck.client';
import { faker, th } from '@faker-js/faker';
import { BadRequest } from '@feathersjs/errors';
import config from 'config';

interface WildDuckAddress {
    success: boolean;
    id: string;
    address: string;
    main: boolean;
    user: string;
    tags: string[];
    created: string;
}

interface GetWildDuckAddressInfoResponse {
    success: boolean;
    results: WildDuckAddress[];
}

interface AliasApiResponse {
    id: string | null;
    address: string;
    tags: string[];
    created: string;
}

interface CreateWildDuckAddressResponse {
    success: boolean;
    id: string;
}

type AliasesData = any;
type AliasesPatch = any;
type AliasesQuery = any;

export type { WildDuckAddress as Aliases, AliasesData, AliasesPatch, AliasesQuery };

export interface AliasesServiceOptions {
    app: Application;
}

export interface AliasesParams extends Params<AliasesQuery> {
    session?: any;
}

export class AliasesService<ServiceParams extends AliasesParams = AliasesParams>
    implements ServiceInterface<AliasApiResponse, AliasesData, ServiceParams, AliasesPatch>
{
    constructor(public options: AliasesServiceOptions) {}

    async find(params: ServiceParams): Promise<AliasApiResponse[]> {
        const userId = await this.getUserIdByEmailAddress(params);

        return this.getUserAddresses(userId);
    }

    async create(data: AliasesData, params: ServiceParams): Promise<AliasApiResponse>;
    async create(data: AliasesData, params: ServiceParams): Promise<AliasApiResponse | AliasApiResponse[]> {
        const userId = await this.getUserIdByEmailAddress(params);

        const randomString = faker.git.commitSha({ length: 4 });

        // Replace all non-alphanumeric characters with nothing and spaces with dashes
        const alias = `${faker.color.human()}-${faker.animal.snake()}-${randomString}`
            .replace(/\s+/g, '-')
            .replace(/[^a-zA-Z0-9-]/g, '')
            .toLowerCase();

        const emailDomain = config.get('wildDuck.domain');

        const createResult = await wildDuckClient.post<CreateWildDuckAddressResponse>(`/users/${userId}/addresses`, {
            address: `${alias}@${emailDomain}`,
        });

        if (!createResult.data.success) {
            throw new BadRequest('Failed to create alias');
        }

        return this.getUserAddresses(userId);
    }

    private async getUserIdByEmailAddress(params: ServiceParams): Promise<string> {
        const emails = params.session?.user?.emails;

        const preferredDomain = config.get('wildDuck.preferredDomain');

        if (!emails.length || !preferredDomain) {
            throw new BadRequest('Unable to find user');
        }

        const addressInfoResponse = await Promise.any(
            emails
                .filter((email: string) => email.endsWith(config.get('wildDuck.preferredDomain')))
                .map((email: string) => wildDuckClient.get<WildDuckAddress>(`addresses/resolve/${email}`))
        );

        return addressInfoResponse.data.user;
    }

    private async getUserAddresses(userId: string): Promise<AliasApiResponse[]> {
        const { data: userAddressesResponse } = await wildDuckClient.get<GetWildDuckAddressInfoResponse>(
            `/users/${userId}/addresses`
        );

        return userAddressesResponse.results.map(this.sanitizeAliasResponse);
    }

    async remove(id: NullableId, params: ServiceParams): Promise<AliasApiResponse[]> {
        const { data: addressInfoResponse } = await wildDuckClient.get<WildDuckAddress>(`addresses/resolve/${id}`);
        const allowedDomain: string = config.get('wildDuck.domain');

        // If address does not match the allowed domain, throw an error
        if (!allowedDomain || !addressInfoResponse.address.endsWith(allowedDomain)) {
            throw new BadRequest('Unable to delete address');
        }
        const userId = await this.getUserIdByEmailAddress(params);

        await wildDuckClient.delete<WildDuckAddress>(`users/${userId}/addresses/${id}`);

        return this.getUserAddresses(userId);
    }

    sanitizeAliasResponse(alias: WildDuckAddress): AliasApiResponse {
        // Prevent the user from deleting their main address or any address that does not end with the preferred domain
        const isRemovable = !alias.main && alias.address.endsWith(config.get('wildDuck.domain'));

        // Hide the id if the alias is not removable
        return {
            id: isRemovable ? alias.id : null,
            address: alias.address,
            tags: alias.tags,
            created: alias.created,
        };
    }
}

export const getOptions = (app: Application) => {
    return { app };
};