/*
 * Copyright 2023 Fluence Labs Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { v4 as uuidv4 } from 'uuid';
import { SrvDef } from './_aqua/single-module-srv.js';
import { FluencePeer } from '../jsPeer/FluencePeer.js';
import { CallParams } from '@fluencelabs/interfaces';
import { Buffer } from 'buffer';
import { allowOnlyParticleOriginatedAt, SecurityGuard } from './securityGuard.js';

export const defaultGuard = (peer: FluencePeer) => {
    return allowOnlyParticleOriginatedAt<any>(peer.keyPair.getPeerId());
};

export class Srv implements SrvDef {
    private services: Set<string> = new Set();

    constructor(private peer: FluencePeer) {
        this.securityGuard_create = defaultGuard(this.peer);
        this.securityGuard_remove = defaultGuard(this.peer);
    }

    securityGuard_create: SecurityGuard<'wasm_b64_content'>;

    async create(wasm_b64_content: string, callParams: CallParams<'wasm_b64_content'>) {
        if (!this.securityGuard_create(callParams)) {
            return {
                success: false,
                error: 'Security guard validation failed',
                service_id: null,
            };
        }

        try {
            const newServiceId = uuidv4();
            const buffer = Buffer.from(wasm_b64_content, 'base64');
            // TODO:: figure out why SharedArrayBuffer is not working here
            // const sab = new SharedArrayBuffer(buffer.length);
            // const tmp = new Uint8Array(sab);
            // tmp.set(buffer, 0);
            await this.peer.registerMarineService(buffer, newServiceId);
            this.services.add(newServiceId);

            return {
                success: true,
                service_id: newServiceId,
                error: null,
            };
        } catch (err: any) {
            return {
                success: true,
                service_id: null,
                error: err.message,
            };
        }
    }

    securityGuard_remove: SecurityGuard<'service_id'>;

    async remove(service_id: string, callParams: CallParams<'service_id'>) {
        if (!this.securityGuard_remove(callParams)) {
            return {
                success: false,
                error: 'Security guard validation failed',
                service_id: null,
            };
        }

        if (!this.services.has(service_id)) {
            return {
                success: false,
                error: `Service with id ${service_id} not found`,
            };
        }

        await this.peer.removeMarineService(service_id);
        this.services.delete(service_id);

        return {
            success: true,
            error: null,
        };
    }

    list() {
        return Array.from(this.services.values());
    }
}