/*
 * Copyright © 2020 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 { Parameter, Parameters } from "@atomist/automation-client/lib/decorators";
import { guid } from "@atomist/automation-client/lib/internal/util/string";
import { EditMode } from "@atomist/automation-client/lib/operations/edit/editModes";
import { GitProject } from "@atomist/automation-client/lib/project/git/GitProject";
import { MessageOptions } from "@atomist/automation-client/lib/spi/message/MessageClient";
import { codeLine, SlackMessage } from "@atomist/slack-messages";
import { StringCapturingProgressLog } from "../../../api-helper/log/StringCapturingProgressLog";
import { spawnLog } from "../../../api-helper/misc/child_process";
import { formatDate } from "../../../api-helper/misc/dateFormat";
import { CodeTransform } from "../../../api/registration/CodeTransform";
import { CodeTransformRegistration } from "../../../api/registration/CodeTransformRegistration";

export const AutoMergeCheckSuccessLabel = "auto-merge:on-check-success";
export const AutoMergeCheckSuccessTag = `[${AutoMergeCheckSuccessLabel}]`;

@Parameters()
export class UpdateDependencyParameters {
    @Parameter({
        displayName: "Desired NPM dist tag to update to",
        description: "The desired NPM dist tag to update dependencies to",
        pattern: /^.+$/,
        required: false,
    })
    public tag: string = "latest";

    @Parameter({
        displayName: "NPM package to update",
        description: "The NPM package to update",
        pattern: /^.+$/,
        required: true,
    })
    public package: string;

    public commitMessage: string;
}

export const UpdateDependencyTransform: CodeTransform<UpdateDependencyParameters> = async (p, ctx, params) => {
    const tag = params.tag;
    const range = tag === "latest" ? "^" : "";
    const pjFile = await p.getFile("package.json");
    const pj = JSON.parse(await pjFile.getContent());
    const versions: string[] = [];

    const message: SlackMessage = {
        text: `Updating ${codeLine(params.package)} NPM dependency of ${codeLine(pj.name)}`,
        attachments: [
            {
                text: "",
                fallback: "Versions",
            },
        ],
    };
    const opts: MessageOptions = {
        id: guid(),
    };

    const sendMessage = async (msg?: string) => {
        if (msg) {
            message.attachments[0].text = `${message.attachments[0].text}${msg}`;
            message.attachments[0].footer = `${configurationValue("name")}:${configurationValue("version")}`;
        }
        await ctx.context.messageClient.respond(message, opts);
    };

    await sendMessage();

    if (pj.dependencies) {
        await updateDependencies(pj.dependencies, params.package, tag, range, versions, sendMessage);
    }
    if (pj.devDependencies) {
        await updateDependencies(pj.devDependencies, params.package, tag, range, versions, sendMessage);
    }

    await pjFile.setContent(`${JSON.stringify(pj, undefined, 2)}\n`);

    if (!(await (p as GitProject).isClean())) {
        await sendMessage(`\nVersion updated. Running ${codeLine("npm install")}`);
        // NPM doesn't like to go back to older versions; hence we delete the lock file here to force the
        // dependencies in
        p.deleteFileSync("package-lock.json");
        const result = await spawnLog("npm", ["i"], {
            cwd: (p as GitProject).baseDir,
            env: {
                ...process.env,
                NODE_ENV: "development",
            },
            log: new StringCapturingProgressLog(),
        });

        await sendMessage(
            result.code === 0
                ? `\n:atomist_build_passed: ${codeLine("npm install")} completed successfully`
                : `\n:atomist_build_failed: ${codeLine("npm install")} failed`,
        );

        // Exit if npm install failed
        if (result.code !== 0) {
            return {
                edited: false,
                target: p,
                success: false,
            };
        }
    }

    params.commitMessage = `Update ${params.package} dependency to tag ${params.tag}

${versions.join("\n")}

[atomist:generated] ${AutoMergeCheckSuccessTag}`;

    return p;
};

async function updateDependencies(
    deps: any,
    pkg: string,
    tag: string,
    range: string,
    versions: string[],
    sendMessage: (msg?: string) => Promise<void>,
): Promise<void> {
    for (const k in deps) {
        if (deps.hasOwnProperty(k)) {
            if (k === pkg) {
                const oldVersion = deps[k];
                const version = `${range}${await latestVersion(`${k}@${tag}`)}`;
                if (version && oldVersion !== version) {
                    deps[k] = version;
                    versions.push(`${k} ${oldVersion} > ${version}`);
                    await sendMessage(
                        `:atomist_build_passed: Updated ${codeLine(k)} from ${codeLine(oldVersion)} to ${codeLine(
                            version,
                        )}\n`,
                    );
                }
            }
        }
    }
}

async function latestVersion(module: string): Promise<string | undefined> {
    const log = new StringCapturingProgressLog();
    const result = await spawnLog("npm", ["show", module, "version"], {
        logCommand: false,
        log,
    });

    if (result.code === 0) {
        return log.log.trim();
    }

    return undefined;
}

export const TryToUpdateDependency: CodeTransformRegistration<UpdateDependencyParameters> = {
    transform: UpdateDependencyTransform,
    paramsMaker: UpdateDependencyParameters,
    name: "UpdateDependency",
    description: `Update NPM dependency`,
    intent: ["update dependency", "update dep"],
    transformPresentation: ci => {
        return new BranchCommit(ci.parameters);
    },
};

class BranchCommit implements EditMode {
    constructor(private readonly params: UpdateDependencyParameters) {}

    get message(): string {
        return this.params.commitMessage || "Update NPM dependency";
    }

    get branch(): string {
        return `atomist-update-${this.params.tag}-${formatDate()}`;
    }
}