import * as core from "@actions/core";
import * as exec from "@actions/exec";
import * as glob from "@actions/glob";
import * as io from "@actions/io";
import * as fs from "fs";
import * as path from "path";
import * as util from "util";
import * as uuidV4 from "uuid/v4";

import {
    CacheFilename,
    CompressionMethod,
    Events,
    Outputs,
    State
} from "../constants";
import { ArtifactCacheEntry } from "../contracts";

// From https://github.com/actions/toolkit/blob/master/packages/tool-cache/src/tool-cache.ts#L23
export async function createTempDirectory(): Promise<string> {
    const IS_WINDOWS = process.platform === "win32";

    let tempDirectory: string = process.env["RUNNER_TEMP"] || "";

    if (!tempDirectory) {
        let baseLocation: string;
        if (IS_WINDOWS) {
            // On Windows use the USERPROFILE env variable
            baseLocation = process.env["USERPROFILE"] || "C:\\";
        } else {
            if (process.platform === "darwin") {
                baseLocation = "/Users";
            } else {
                baseLocation = "/home";
            }
        }
        tempDirectory = path.join(baseLocation, "actions", "temp");
    }

    const dest = path.join(tempDirectory, uuidV4.default());
    await io.mkdirP(dest);
    return dest;
}

export function getArchiveFileSize(path: string): number {
    return fs.statSync(path).size;
}

export function isExactKeyMatch(
    key: string,
    cacheResult?: ArtifactCacheEntry
): boolean {
    return !!(
        cacheResult &&
        cacheResult.cacheKey &&
        cacheResult.cacheKey.localeCompare(key, undefined, {
            sensitivity: "accent"
        }) === 0
    );
}

export function setCacheState(state: ArtifactCacheEntry): void {
    core.saveState(State.CacheResult, JSON.stringify(state));
}

export function setCacheHitOutput(isCacheHit: boolean): void {
    core.setOutput(Outputs.CacheHit, isCacheHit.toString());
}

export function setOutputAndState(
    key: string,
    cacheResult?: ArtifactCacheEntry
): void {
    setCacheHitOutput(isExactKeyMatch(key, cacheResult));
    // Store the cache result if it exists
    cacheResult && setCacheState(cacheResult);
}

export function getCacheState(): ArtifactCacheEntry | undefined {
    const stateData = core.getState(State.CacheResult);
    core.debug(`State: ${stateData}`);
    if (stateData) {
        return JSON.parse(stateData) as ArtifactCacheEntry;
    }

    return undefined;
}

export function logWarning(message: string): void {
    const warningPrefix = "[warning]";
    core.info(`${warningPrefix}${message}`);
}

export async function resolvePaths(patterns: string[]): Promise<string[]> {
    const paths: string[] = [];
    const workspace = process.env["GITHUB_WORKSPACE"] ?? process.cwd();
    const globber = await glob.create(patterns.join("\n"), {
        implicitDescendants: false
    });

    for await (const file of globber.globGenerator()) {
        const relativeFile = path.relative(workspace, file);
        core.debug(`Matched: ${relativeFile}`);
        // Paths are made relative so the tar entries are all relative to the root of the workspace.
        paths.push(`${relativeFile}`);
    }

    return paths;
}

export function getSupportedEvents(): string[] {
    return [Events.Push, Events.PullRequest];
}

// Currently the cache token is only authorized for push and pull_request events
// All other events will fail when reading and saving the cache
// See GitHub Context https://help.github.com/actions/automating-your-workflow-with-github-actions/contexts-and-expression-syntax-for-github-actions#github-context
export function isValidEvent(): boolean {
    const githubEvent = process.env[Events.Key] || "";
    return getSupportedEvents().includes(githubEvent);
}

export function unlinkFile(path: fs.PathLike): Promise<void> {
    return util.promisify(fs.unlink)(path);
}

async function checkVersion(app: string): Promise<string> {
    core.debug(`Checking ${app} --version`);
    let versionOutput = "";
    try {
        await exec.exec(`${app} --version`, [], {
            ignoreReturnCode: true,
            silent: true,
            listeners: {
                stdout: (data: Buffer): string =>
                    (versionOutput += data.toString()),
                stderr: (data: Buffer): string =>
                    (versionOutput += data.toString())
            }
        });
    } catch (err) {
        core.debug(err.message);
    }

    versionOutput = versionOutput.trim();
    core.debug(versionOutput);
    return versionOutput;
}

export async function getCompressionMethod(): Promise<CompressionMethod> {
    const versionOutput = await checkVersion("zstd");
    return versionOutput.toLowerCase().includes("zstd command line interface")
        ? CompressionMethod.Zstd
        : CompressionMethod.Gzip;
}

export function getCacheFileName(compressionMethod: CompressionMethod): string {
    return compressionMethod == CompressionMethod.Zstd
        ? CacheFilename.Zstd
        : CacheFilename.Gzip;
}

export async function useGnuTar(): Promise<boolean> {
    const versionOutput = await checkVersion("tar");
    return versionOutput.toLowerCase().includes("gnu tar");
}