// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for details.

const gulp = require("gulp");
const log = require("fancy-log");
const istanbul = require("gulp-istanbul");
const isparta = require("isparta");
const sourcemaps = require("gulp-sourcemaps");
const path = require("path");
const preprocess = require("gulp-preprocess");
const ts = require("gulp-typescript");
const mocha = require("gulp-mocha");
const GulpExtras = require("./tools/gulp-extras");
const minimist = require("minimist");
const os = require("os");
const fs = require("fs");
const es = require("event-stream");
const remapIstanbul = require("remap-istanbul/lib/gulpRemapIstanbul");
const nls = require("vscode-nls-dev");
const webpack = require("webpack");
const filter = require('gulp-filter');
const del = require("del");
const vscodeTest = require("vscode-test");
const cp = require("child_process");

const copyright = GulpExtras.checkCopyright;
const imports = GulpExtras.checkImports;
const executeCommand = GulpExtras.executeCommand;
const tsProject = ts.createProject("tsconfig.json");


/**
 * Whether we're running a nightly build.
 */
const isNightly = process.argv.includes("--nightly");

const ExtensionName  = isNightly ? "msjsdiag.vscode-react-native-preview" : "msjsdiag.vscode-react-native";
const translationProjectName  = "vscode-extensions";
const defaultLanguages = [
    { id: "zh-tw", folderName: "cht", transifexId: "zh-hant" },
    { id: "zh-cn", folderName: "chs", transifexId: "zh-hans" },
    { id: "ja", folderName: "jpn" },
    { id: "ko", folderName: "kor" },
    { id: "de", folderName: "deu" },
    { id: "fr", folderName: "fra" },
    { id: "es", folderName: "esn" },
    { id: "ru", folderName: "rus" },
    { id: "it", folderName: "ita" },

    // These language-pack languages are included for VS but excluded from the vscode package
    { id: "cs", folderName: "csy" },
    { id: "tr", folderName: "trk" },
    { id: "pt-br", folderName: "ptb", transifexId: "pt-BR" },
    { id: "pl", folderName: "plk" }
];

const srcPath = "src";
const testPath = "test";
const buildDir = "src";
const distDir = "dist";
const distSrcDir = `${distDir}/src`;

const sources = [srcPath, testPath].map((tsFolder) => tsFolder + "/**/*.ts");

const knownOptions = {
    string: "env",
    default: { env: "production" }
};

const options = minimist(process.argv.slice(2), knownOptions);

let lintSources = [srcPath, testPath].map((tsFolder) => tsFolder + "/**/*.ts");
lintSources = lintSources.concat([
    "!src/typings/**",
    "!test/resources/sampleReactNative022Project/**",
    "!test/smoke/**",
    "!/SmokeTestLogs/**"
]);

async function runWebpack({
    packages = [],
    devtool = false,
    compileInPlace = false,
    mode = process.argv.includes("watch") ? "development" : "production",
  } = options) {

    let configs = [];
    for (const { entry, library, filename } of packages) {
      const config = {
        mode,
        target: "node",
        entry: path.resolve(entry),
        output: {
          path: compileInPlace ? path.resolve(path.dirname(entry)) : path.resolve(distDir),
          filename: filename || path.basename(entry).replace(".js", ".bundle.js"),
          devtoolModuleFilenameTemplate: "../[resource-path]",
        },
        devtool: devtool,
        resolve: {
          extensions: [".js", ".ts", ".json"],
        },
        module: {
            rules: [{
                test: /\.ts$/,
                exclude: /node_modules/,
                use: [{
                    // vscode-nls-dev loader:
                    // * rewrite nls-calls
                    loader: 'vscode-nls-dev/lib/webpack-loader',
                    options: {
                        base: path.join(__dirname)
                    }
                }, {
                    // configure TypeScript loader:
                    // * enable sources maps for end-to-end source maps
                    loader: 'ts-loader',
                    options: {
                        compilerOptions: {
                            "sourceMap": true,
                        }
                    }
                }]
            }]
        },
        node: {
          __dirname: false,
          __filename: false,
        },
        externals: {
          vscode: "commonjs vscode",
        }
      };

      if (library) {
        config.output.libraryTarget = "commonjs2";
      }

      if (process.argv.includes("--analyze-size")) {
        config.plugins = [
          new (require("webpack-bundle-analyzer").BundleAnalyzerPlugin)({
            analyzerMode: "static",
            reportFilename: path.resolve(distSrcDir, path.basename(entry) + ".html"),
          }),
        ];
      }

      configs.push(config);
    }

    await new Promise((resolve, reject) =>
      webpack(configs, (err, stats) => {
        if (err) {
          reject(err);
        } else if (stats.hasErrors()) {
          reject(stats);
        } else {
          resolve();
        }
      }),
    );
}

// Generates ./dist/nls.bundle.<language_id>.json from files in ./i18n/** *//<src_path>/<filename>.i18n.json
// Localized strings are read from these files at runtime.
const generateSrcLocBundle = () => {
    // Transpile the TS to JS, and let vscode-nls-dev scan the files for calls to localize.
    return tsProject.src()
        .pipe(sourcemaps.init())
        .pipe(tsProject()).js
        .pipe(nls.createMetaDataFiles())
        .pipe(nls.createAdditionalLanguageFiles(defaultLanguages, "i18n"))
        .pipe(nls.bundleMetaDataFiles(ExtensionName, 'dist'))
        .pipe(nls.bundleLanguageFiles())
        .pipe(filter(['**/nls.bundle.*.json', '**/nls.metadata.header.json', '**/nls.metadata.json', "!src/**"]))
        .pipe(gulp.dest('dist'));
};

function build(failOnError, buildNls) {

    const isProd = options.env === "production";
    const preprocessorContext = isProd ? { PROD: true } : { DEBUG: true };
    let gotError = false;
    log(`Building with preprocessor context: ${JSON.stringify(preprocessorContext)}`);
    const tsResult = tsProject.src()
        .pipe(preprocess({ context: preprocessorContext })) //To set environment variables in-line
        .pipe(sourcemaps.init())
        .pipe(tsProject());

    return tsResult.js
        .pipe(buildNls ? nls.rewriteLocalizeCalls() : es.through())
        .pipe(buildNls ? nls.createAdditionalLanguageFiles(defaultLanguages, "i18n", ".") : es.through())
        .pipe(buildNls ? nls.bundleMetaDataFiles(ExtensionName, ".") : es.through())
        .pipe(buildNls ? nls.bundleLanguageFiles() : es.through())
        .pipe(sourcemaps.write(".", { includeContent: false, sourceRoot: "." }))
        .pipe(gulp.dest((file) => file.cwd))
        .once("error", () => {
            gotError = true;
        })
        .once("finish", () => {
            if (failOnError && gotError) {
                process.exit(1);
            }
        });
}

async function test() {

    // Check if arguments were passed
    if (options.pattern) {
        log(`\nTesting cases that match pattern: ${options.pattern}`);
    } else {
        log(`\nTesting cases that don't match pattern: extensionContext|localizationContext`);
    }

    try {
        // The folder containing the Extension Manifest package.json
        // Passed to `--extensionDevelopmentPath`
        const extensionDevelopmentPath = __dirname;

        // The path to the extension test runner script
        // Passed to --extensionTestsPath
        const extensionTestsPath = path.resolve(__dirname, "test", "index");
        console.log(extensionTestsPath);
        // Download VS Code, unzip it and run the integration test
        await vscodeTest.runTests({
          extensionDevelopmentPath,
          extensionTestsPath,
        });
    } catch (err) {
        console.error(err);
        console.error("Failed to run tests");
        process.exit(1);
    }
}

gulp.task("check-imports", () => {
    const tsProject = ts.createProject("tsconfig.json");
    return tsProject.src()
        .pipe(imports());
});

gulp.task("check-copyright", () => {
    return gulp.src([
        "**/*.ts",
        "**/*.js",
        "!**/*.d.ts",
        "!coverage/**",
        "!node_modules/**",
        "!test/**/*.js",
        "!SampleApplication/**",
        "!test/resources/sampleReactNative022Project/**/*.js",
        "!test/smoke/package/node_modules/**",
        "!test/smoke/automation/node_modules/**",
        "!test/smoke/resources/**",
        "!test/smoke/vscode/**",
        "!dist/**"
    ])
        .pipe(copyright());
});

const runEslint = (fix, callback) => {
    const child = cp.fork(
      "./node_modules/eslint/bin/eslint.js",
      [
        '--color',
        "src/**/*.ts",
        fix ? '--fix' : '',
    ],
        { stdio: 'inherit' },
    );

    child.on('exit', code => (code ? callback(`Eslint exited with code ${code}`) : callback()));
}

gulp.task('eslint', callback => runEslint(false, callback));
gulp.task('eslint:format', callback => runEslint(true, callback));

/** Run webpack to bundle the extension output files */
gulp.task("webpack-bundle", async () => {
    const packages = [
      { entry: `${buildDir}/extension/rn-extension.ts`, filename: "rn-extension.js", library: true },
    ];
    return runWebpack({ packages });
});

gulp.task("clean", () => {

    const pathsToDelete = [
        "src/**/*.js",
        "src/**/*.js.map",
        "test/**/*.js",
        "test/**/*.js.map",
        "out/",
        "dist",
        "!test/resources/sampleReactNative022Project/**/*.js",
        ".vscode-test/",
        "nls.*.json",
        "!test/smoke/**/*",
    ]
    return del(pathsToDelete, { force: true });
});

// TODO: The file property should point to the generated source (this implementation adds an extra folder to the path)
// We should also make sure that we always generate urls in all the path properties (We shouldn"t have \\s. This seems to
// be an issue on Windows platforms)
gulp.task("build", gulp.series("check-imports", "eslint", function runBuild(done) {
    build(true, true)
        .once("finish", () => {
            done();
        });
}));

gulp.task("build-dev", gulp.series("check-imports", "eslint", function runBuild(done) {
    build(false, false)
        .once("finish", () => {
            done();
        });
}));

gulp.task("quick-build", gulp.series("build-dev"));

gulp.task("watch", gulp.series("build", function runWatch() {
    log("Watching build sources...");
    return gulp.watch(sources, gulp.series("build"));
}));

gulp.task("prod-build", gulp.series("clean", "webpack-bundle", generateSrcLocBundle));

gulp.task("default", gulp.series("prod-build"));

gulp.task("test", gulp.series("build", "eslint", test));

gulp.task("coverage:instrument", () => {
    return gulp.src(["src/**/*.js", "!test/**"])
        .pipe(istanbul({
            // Use the isparta instrumenter (code coverage for ES6)
            instrumenter: isparta.Instrumenter,
            includeUntested: true
        }))
        // Force `require` to return covered files
        .pipe(istanbul.hookRequire());
});

gulp.task("coverage:report", () => {
    return gulp.src(
        ["src/**/*.js", "!test/**"],
        { read: false }
    )
    .pipe(istanbul.writeReports({
        reporters: ["json", "text-summary"]
    }));
});

gulp.task("coverage:remap", () => {
    return gulp.src("coverage/coverage-final.json")
        .pipe(remapIstanbul({
            reports: {
                "json": "coverage/coverage.json",
                "html": "coverage/html-report"
            }
        }));
});

gulp.task("test-no-build", test);

gulp.task("test:coverage", gulp.series("quick-build", "coverage:instrument", "test-no-build", "coverage:report", "coverage:remap"));

gulp.task("watch-build-test", gulp.series("build", "test", function runWatch() {
    return gulp.watch(sources, gulp.series("build", "test"));
}));

gulp.task("package", (callback) => {
    const command = path.join(__dirname, "node_modules", ".bin", "vsce");
    const args = ["package"];
    executeCommand(command, args, callback);
});

function readJson(file) {
    const contents = fs.readFileSync(path.join(__dirname, file), "utf-8").toString();
    return JSON.parse(contents);
}

function writeJson(file, jsonObj) {
    const content = JSON.stringify(jsonObj, null , 2);
    fs.writeFileSync(path.join(__dirname, file), content);
}

/**
 * Generate version number for a nightly build.
 */
const getVersionNumber = () => {
    const date = new Date(new Date().toLocaleString("en-US", { timeZone: "America/Los_Angeles" }));

    return [
      // YY
      date.getFullYear(),
      // MM,
      date.getMonth() + 1,
      //DDHH
      `${date.getDate()}${String(date.getHours()).padStart(2, "0")}`,
    ].join(".");
};

gulp.task("release", function prepareLicenses() {
    const backupFiles = ["LICENSE.txt", "ThirdPartyNotices.txt", "package.json"];
    const backupFolder = path.resolve(path.join(os.tmpdir(), "vscode-react-native"));
    if (!fs.existsSync(backupFolder)) {
        fs.mkdirSync(backupFolder);
    }


    return Promise.resolve()
        .then(() => {
            /* back up LICENSE.txt, ThirdPartyNotices.txt, README.md */
            log("Backing up license files to " + backupFolder + "...");
            backupFiles.forEach((fileName) => {
                fs.writeFileSync(path.join(backupFolder, fileName), fs.readFileSync(fileName));
            });

            /* copy over the release package license files */
            log("Preparing license files for release...");
            fs.writeFileSync("LICENSE.txt", fs.readFileSync("release/LICENSE.txt"));
            fs.writeFileSync("ThirdPartyNotices.txt", fs.readFileSync("release/ThirdPartyNotices.txt"));
        }).then(() => {
            let packageJson = readJson("package.json");
            packageJson.main = "./dist/rn-extension";
            if (isNightly) {
                log("Performing nightly release...");
                packageJson.version = getVersionNumber();
            }
            writeJson("package.json", packageJson);
            log("Creating release package...");
            return new Promise((resolve, reject) => {
                // NOTE: vsce must see npm 3.X otherwise it will not correctly strip out dev dependencies.
                executeCommand("vsce", ["package"], (arg) => { if (arg) { reject(arg); } resolve(); }, { cwd: path.resolve(__dirname) });
            })
        }).finally(() => {
            /* restore backed up files */
            log("Restoring modified files...");
            backupFiles.forEach((fileName) => {
                fs.writeFileSync(path.join(__dirname, fileName), fs.readFileSync(path.join(backupFolder, fileName)));
            });
        });
});

// Creates package.i18n.json files for all languages from {workspaceRoot}/i18n folder into project root
gulp.task("add-i18n", () => {
    return gulp.src(["package.nls.json"])
        .pipe(nls.createAdditionalLanguageFiles(defaultLanguages, "i18n"))
        .pipe(gulp.dest("."))
});

// Creates MLCP readable .xliff file and saves it locally
gulp.task("translations-export", gulp.series("build", function runTranslationExport() {
    return gulp.src(["package.nls.json", "nls.metadata.header.json", "nls.metadata.json"])
        .pipe(nls.createXlfFiles(translationProjectName, ExtensionName))
        .pipe(gulp.dest(path.join("..", `${translationProjectName}-localization-export`)));
}));

// Imports localization from raw localized MLCP strings to VS Code .i18n.json files
gulp.task("translations-import", (done) => {
    var options = minimist(process.argv.slice(2), {
        string: "location",
        default: {
            location: "../vscode-translations-import"
        }
    });
    es.merge(defaultLanguages.map((language) => {
        let id = language.transifexId || language.id;
        log(path.join(options.location, id, "vscode-extensions", `${ExtensionName}.xlf`));
        return gulp.src(path.join(options.location, id, "vscode-extensions", `${ExtensionName}.xlf`))
            .pipe(nls.prepareJsonFiles())
            .pipe(gulp.dest(path.join("./i18n", language.folderName)));
    }))
        .pipe(es.wait(() => {
            done();
        }));
});
