/*
 * Copyright © 2019 Atomist, Inc.
 *
 * 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 {
    AutomationContextAware,
    HandlerContext,
} from "@atomist/automation-client/lib/HandlerContext";
import { MutationOptions } from "@atomist/automation-client/lib/spi/graph/GraphClient";
import {
    Destination,
    MessageClient,
    MessageOptions,
    SlackMessageClient,
} from "@atomist/automation-client/lib/spi/message/MessageClient";
import { SlackMessage } from "@atomist/slack-messages";

/**
 * Convenient function to allow creating fake contexts.
 * Useful for testing
 * @param {string} workspaceId
 * @return {any}
 */
export function fakeContext(workspaceId: string = "T123"): HandlerContext & AutomationContextAware {
    const correlationId = "foo";
    return {
        workspaceId,
        messageClient: new DevNullMessageClient(),
        graphClient: {
            mutate<T, Q>(optionsOrName: MutationOptions<Q> | string): Promise<T> {
                return undefined;
            },
        } as any,
        correlationId,
        context: {
            name: "test-context",
            workspaceId,
            workspaceName: workspaceId,
            operation: "operation",
            version: "0.1.0",
            invocationId: "inv-id",
            ts: new Date().getTime(),
            correlationId,
        },
        trigger: {} as any,
    };
}

/**
 * Throw it all away
 */
class DevNullMessageClient implements MessageClient, SlackMessageClient {

    public async addressChannels(msg: string | SlackMessage,
                                 channels: string | string[],
                                 options?: MessageOptions): Promise<void> {
        return;
    }

    public async addressUsers(msg: string | SlackMessage,
                              users: string | string[],
                              options?: MessageOptions): Promise<void> {
        return;
    }

    public async respond(msg: any,
                         options?: MessageOptions): Promise<void> {
        return;
    }

    public async send(msg: any,
                      destinations: Destination | Destination[],
                      options?: MessageOptions): Promise<void> {
        return;
    }

}