/*
 * 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 {
    GitHubRepoRef,
    GitProject,
    logger,
    ProjectOperationCredentials,
    RemoteRepoRef,
} from "@atomist/automation-client";
import {
    ExecuteGoal,
    ExecuteGoalResult,
    GoalInvocation,
    LoggingProgressLog,
    ProgressLog,
    spawnLog,
} from "@atomist/sdm";
import {
    createTag,
    createTagReference,
    Tag,
} from "../../../util/github/ghub";
import { goalInvocationVersion } from "./local/projectVersioner";

/**
 * Options for creating a tag.  If neither `name` or `release` are
 * truthy, a prerelease, i.e., timestamped, version tag is created.
 * If both `name` and `release` are truthy, `name` takes precedence.
 */
export interface ExecuteTagOptions {
    /**
     * Message to add to tag.  If not provided, the push after commit
     * message title is used.
     */
    message?: string;
    /** Name of tag to create. */
    name?: string;
    /**
     * If `true`, create a release semantic version tag, not a
     * prerelease version tag.
     */
    release?: boolean;
    /**
     * Semantic version build metadata to append to tag, e.g.,
     * "sdm.BUILD_NUMBER".
     */
    build?: string;
}

/**
 * Create and return an execute goal object that creates a Git tag,
 * suitable for use with the [[Tag]] goal.
 *
 * @param opts Options that determine the tag created
 * @return Success if successful, Failure otherwise
 */
export function executeTag(opts: ExecuteTagOptions = {}): ExecuteGoal {
    return async (goalInvocation: GoalInvocation): Promise<ExecuteGoalResult> => {
        const { configuration, goalEvent, credentials, id, context, progressLog } = goalInvocation;

        return configuration.sdm.projectLoader.doWithProject({ credentials, id, context, readOnly: false }, async project => {
            try {
                let tag: string;
                let message: string;
                if (opts.message) {
                    message = opts.message;
                } else if (goalEvent.push.after && goalEvent.push.after.message) {
                    message = goalEvent.push.after.message.split("\n")[0];
                }
                if (opts.name) {
                    tag = opts.name;
                    message = message || `Tag ${opts.name}`;
                } else {
                    const version = await goalInvocationVersion(goalInvocation);
                    if (opts.release) {
                        tag = version.replace(/[-+].*/, "");
                        message = message || `Release ${tag}`;
                    } else {
                        tag = version;
                        message = message || `Prerelease ${tag}`;
                    }
                }
                if (opts.build) {
                    tag += "+" + opts.build;
                }
                await createGitTag({ project, tag, message, log: progressLog });
                return { code: 0, message: `Created tag '${tag}' for ${goalEvent.repo.owner}/${goalEvent.repo.name}` };
            } catch (e) {
                const message = `Failed to create tag for ${goalEvent.repo.owner}/${goalEvent.repo.name}: ${e.message}`;
                logger.error(message);
                progressLog.write(message);
                return { code: 1, message };
            }
        });
    };
}

/** [[createTag]] function arguments. */
export interface CreateGitTagOptions {
    /** Git repository project to operate on. */
    project: GitProject;
    /** Name of tag to create and push. */
    tag: string;
    /** Optional message to associate with Git tag. */
    message?: string;
    /** Optional progress log to write updates to. */
    log?: ProgressLog;
}

/**
 * Create and push a Git tag with optional message.
 *
 * @param opts Options for creating a Git tag.
 */
export async function createGitTag(opts: CreateGitTagOptions): Promise<void> {
    if (!opts.tag) {
        throw new Error("You must provide a valid Git tag");
    }
    if (!opts.project) {
        throw new Error("You must provide a Git project");
    }
    if (!opts.log) {
        opts.log = new LoggingProgressLog("logger");
    }
    const remote = opts.project.remote || "origin";
    try {
        const spawnOpts = { cwd: opts.project.baseDir, log: opts.log };
        const tagArgs = ["tag", opts.tag];
        if (opts.message) {
            tagArgs.splice(1, 0, "-m", opts.message);
        }
        const tagResult = await spawnLog("git", tagArgs, spawnOpts);
        if (tagResult.code) {
            throw new Error(`git tag failed: ${tagResult.message}`);
        }
        const pushResult = await spawnLog("git", ["push", remote, opts.tag], spawnOpts);
        if (pushResult.code) {
            throw new Error(`git push failed: ${pushResult.message}`);
        }
    } catch (e) {
        e.message = `Failed to create and push git tag '${opts.tag}': ${e.message}`;
        throw e;
    }
}

/**
 * Create a GitHub tag using the GitHub API.
 *
 * @param id GitHub remote repository reference
 * @param sha Commit SHA to tag
 * @param message Tag message
 * @param version Name of tag
 * @param credentials GitHub token object
 * @deprecated use createGitTag
 */
export async function createTagForStatus(id: RemoteRepoRef,
                                         sha: string,
                                         message: string,
                                         version: string,
                                         credentials: ProjectOperationCredentials): Promise<void> {
    const tag: Tag = {
        tag: version,
        message,
        object: sha,
        type: "commit",
        tagger: {
            name: "Atomist",
            email: "info@atomist.com",
            date: new Date().toISOString(),
        },
    };

    await createTag(credentials, id as GitHubRepoRef, tag);
    await createTagReference(credentials, id as GitHubRepoRef, tag);
}