/*
 * 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 { configurationValue } from "@atomist/automation-client/lib/configuration";
import { HandlerContext } from "@atomist/automation-client/lib/HandlerContext";
import { guid } from "@atomist/automation-client/lib/internal/util/string";
import {
    Attachment,
    SlackMessage,
    url,
} from "@atomist/slack-messages";
import * as base64 from "../base64";

export function slackSuccessMessage(title: string, text: string, options: Partial<Attachment> = {}): SlackMessage {
    const msg: SlackMessage = {
        attachments: [{
            author_icon: `https://images.atomist.com/rug/check-circle.gif?gif=${guid()}`,
            author_name: title,
            text,
            fallback: text,
            color: "#37A745",
            mrkdwn_in: ["text"],
            footer: slackFooter(),
            ts: slackTs(),
            ...options,
        }],
    };
    return msg;
}

export function slackQuestionMessage(title: string, text: string, options: Partial<Attachment> = {}): SlackMessage {
    const msg: SlackMessage = {
        attachments: [{
            author_icon: `https://images.atomist.com/rug/question.png`,
            author_name: title,
            text,
            fallback: text,
            color: "#B5B5B5",
            mrkdwn_in: ["text"],
            footer: slackFooter(),
            ts: slackTs(),
            ...options,
        }],
    };
    return msg;
}

export function slackInfoMessage(title: string, text: string, options: Partial<Attachment> = {}): SlackMessage {
    const msg: SlackMessage = {
        attachments: [{
            author_icon: `https://images.atomist.com/rug/info.png`,
            author_name: title,
            text,
            fallback: text,
            color: "#B5B5B5",
            mrkdwn_in: ["text"],
            footer: slackFooter(),
            ts: slackTs(),
            ...options,
        }],
    };
    return msg;
}

export function slackWarningMessage(title: string, text: string, ctx: HandlerContext, options: Partial<Attachment> = {}): SlackMessage {
    const msg: SlackMessage = {
        attachments: [{
            author_icon: `https://images.atomist.com/rug/warning-yellow.png`,
            author_name: title,
            text,
            fallback: text,
            color: "#D7B958",
            mrkdwn_in: ["text"],
            footer: slackSupportLink(ctx),
            ts: slackTs(),
            ...options,
        }],
    };
    return msg;
}

export function slackErrorMessage(title: string, text: string, ctx: HandlerContext, options: Partial<Attachment> = {}): SlackMessage {
    const msg: SlackMessage = {
        attachments: [{
            author_icon: "https://images.atomist.com/rug/error-circle.png",
            author_name: title,
            text,
            fallback: text,
            color: "#BC3D33",
            mrkdwn_in: ["text"],
            footer: slackSupportLink(ctx),
            ts: slackTs(),
            ...options,
        }],
    };
    return msg;
}

export function slackSupportLink(ctx: HandlerContext): string {
    const supportUrl =
        `https://atomist.typeform.com/to/yvnyOj?message_id=${base64.encode(ctx.invocationId)}`;
    return `${slackFooter()} \u00B7 ${url(supportUrl, "Support")}`;
}

export function slackFooter(): string {
    return `${configurationValue<string>("name")}`;
}

export function slackTs(): number {
    return Math.floor(Date.now() / 1000);
}