const gulp = require("gulp");

const all = require("gulp-all");
const concat = require("gulp-concat");
const del = require("del");
const es = require("child_process").execSync;
const flatten = require("gulp-flatten");
const fontello = require("gulp-fontello");
const minify = require("gulp-minify");
const removeSourcemaps = require("gulp-remove-sourcemaps");
const sass = require("gulp-sass")(require("sass"));
const sassGlob = require("gulp-sass-glob");
const styleLint = require("@ronilaukkarinen/gulp-stylelint");
const spawn = require("child_process").spawn;

const config = require("./gulpfile.config.js");

/**
 * Spawns a command for pipenv.
 *
 * @param command
 *   Command and arguments.
 *
 * @returns {Promise<unknown>}
 *
 * @private
 */
function _runInPipenv(command) {
  command.unshift("run");
  command = command.concat(process.argv.splice(3));
  return new Promise((resolve, reject) => {
    spawn("pipenv", command, { stdio: "inherit" }).on("exit", function (code) {
      if (code) {
        reject();
      }
      resolve();
    });
  });
}

/**
 * Run Command
 *
 * @param command
 *   Command and arguments.
 *
 * @returns {Promise<unknown>}
 *
 * @private
 */
function _runCommand(program, command) {
  return new Promise((resolve, reject) => {
    spawn(program, command, { stdio: "inherit" }).on("exit", function (code) {
      if (code) {
        reject();
      }
      resolve();
    });
  });
}

/**
 * Deletes local static files.
 *
 * @returns {*}
 */
function clean() {
  return del(["**/static", "static"]);
}

/**
 * Runs coverage operations.
 *
 * @param cb
 */
function coverage(cb) {
  // Erase any previous coverage results.
  es("pipenv run coverage erase", { stdio: "inherit" });

  // Run tests with coverage.
  spawn(
    "pipenv",
    [
      "run",
      "coverage",
      "run",
      "manage.py",
      "test",
      "--settings=babybuddy.settings.test",
      "--parallel",
      "--exclude-tag",
      "isolate",
    ],
    {
      stdio: "inherit",
    },
  ).on("exit", function (code) {
    // Run isolated tests with coverage.
    if (code === 0) {
      try {
        config.testsConfig.isolated.forEach(function (test_name) {
          es(
            "pipenv run coverage run manage.py test --settings=babybuddy.settings.test " +
              test_name,
            { stdio: "inherit" },
          );
        });
      } catch (error) {
        console.error(error);
        cb();
        process.exit(1);
      }

      // Combine coverage results.
      es("pipenv run coverage combine", { stdio: "inherit" });
    }

    cb();
    process.exit(code);
  });
}

/**
 * Builds the documentation site locally.
 */
function docsBuild() {
  return _runInPipenv(["mkdocs", "build"]);
}

/**
 * Deploys the documentation site to GitHub Pages.
 */
function docsDeploy() {
  return _runInPipenv(["mkdocs", "gh-deploy"]);
}

/**
 * Serves the documentation site, watching for changes.
 */
function docsWatch() {
  return _runInPipenv(["mkdocs", "serve"]);
}

/**
 * Builds and copies "extra" static files to configured paths.
 */
function extras() {
  return all(
    gulp
      .src(config.extrasConfig.fonts.files)
      .pipe(gulp.dest(config.extrasConfig.fonts.dest)),
    gulp
      .src(config.extrasConfig.images.files)
      .pipe(flatten({ subPath: 3 }))
      .pipe(gulp.dest(config.extrasConfig.images.dest)),
    gulp
      .src(config.extrasConfig.logo.files)
      .pipe(flatten({ subPath: 3 }))
      .pipe(gulp.dest(config.extrasConfig.logo.dest)),
    gulp
      .src(config.extrasConfig.root.files)
      .pipe(gulp.dest(config.extrasConfig.root.dest)),
  );
}

/**
 * Runs Black formatting on Python code.
 */
function format() {
  return all(
    _runInPipenv(["black", "."]),
    _runInPipenv(["djlint", "--reformat", "."]),
    _runCommand("npx", ["prettier", ".", "--write"]),
  );
}

/**
 * Runs linting on Python and SASS code.
 */
function lint() {
  return all(
    _runInPipenv(["black", ".", "--check", "--diff", "--color"]),
    _runInPipenv(["djlint", "--check", "."]),
    _runCommand("npx", ["prettier", ".", "--check"]),
    gulp.src(config.watchConfig.stylesGlob).pipe(
      styleLint({
        reporters: [{ formatter: "string", console: true }],
      }),
    ),
  );
}

/**
 * Builds and copies JavaScript static files to configured paths.
 */
function scripts() {
  const streams = [];
  const types = ["vendor", "graph", "app", "tags_editor"];
  types.forEach((type) => {
    streams.push(
      gulp
        .src(config.scriptsConfig[type])
        .pipe(removeSourcemaps())
        .pipe(concat(`${type}.js`))
        .pipe(
          minify({
            ext: { min: ".js" },
            noSource: true,
          }),
        )
        .pipe(gulp.dest(config.scriptsConfig.dest)),
    );
  });
  return all(streams);
}

/**
 * Builds and copies CSS static files to configured paths.
 */
function styles() {
  return gulp
    .src(config.stylesConfig.app)
    .pipe(sassGlob({ ignorePaths: config.stylesConfig.ignore }))
    .pipe(sass().on("error", sass.logError))
    .pipe(concat("app.css"))
    .pipe(gulp.dest(config.stylesConfig.dest));
}

/**
 * Runs all tests _not_ tagged "isolate".
 *
 * @param cb
 */
function test(cb) {
  let command = [
    "run",
    "python",
    "-Wa",
    "manage.py",
    "test",
    "--settings=babybuddy.settings.test",
    "--parallel",
    "--exclude-tag",
    "isolate",
  ];
  command = command.concat(process.argv.splice(3));
  spawn("pipenv", command, { stdio: "inherit" }).on("exit", function (code) {
    if (code === 0) {
      // Run isolated tests.
      config.testsConfig.isolated.forEach(function (test_name) {
        try {
          es(
            "pipenv run python manage.py test --settings=babybuddy.settings.test " +
              test_name,
            { stdio: "inherit" },
          );
        } catch (error) {
          console.error(error);
          cb();
          process.exit(1);
        }
      });
    }
    cb();
    process.exit(code);
  });
}

/**
 * Updates glyphs font data from Fontello.
 */
function updateGlyphs() {
  return gulp
    .src(config.glyphFontConfig.configFile)
    .pipe(fontello({ assetsOnly: false }))
    .pipe(gulp.dest(config.glyphFontConfig.dest));
}

/**
 * Watches for changes in configured files.
 */
function watch() {
  gulp.watch(config.watchConfig.scriptsGlob, scripts);
  gulp.watch(config.watchConfig.stylesGlob, styles);
}

/**
 * Django management command passthroughs.
 */

gulp.task("collectstatic", function (cb) {
  let command = ["run", "python", "manage.py", "collectstatic"];

  /* Use base settings if no settings parameter is supplied. */
  const parameters = process.argv.splice(3);
  let noSettings = true;
  for (let i = 0; i < parameters.length; i++) {
    if (parameters[i].substring(0, 10) === "--settings") {
      noSettings = false;
      break;
    }
  }
  if (noSettings) {
    parameters.push("--settings=babybuddy.settings.base");
  }

  command = command.concat(parameters);
  spawn("pipenv", command, { stdio: "inherit" }).on("exit", cb);
});

gulp.task("compilemessages", () => {
  return _runInPipenv(["python", "manage.py", "compilemessages"]);
});

gulp.task("fake", () => {
  return _runInPipenv(["python", "manage.py", "fake"]);
});

gulp.task("migrate", () => {
  return _runInPipenv(["python", "manage.py", "migrate"]);
});

gulp.task("makemessages", () => {
  return _runInPipenv(["python", "manage.py", "makemessages"]);
});

gulp.task("makemigrations", () => {
  return _runInPipenv(["python", "manage.py", "makemigrations"]);
});

gulp.task("reset", () => {
  return _runInPipenv(["python", "manage.py", "reset", "--no-input"]);
});

gulp.task("runserver", function (cb) {
  let command = ["run", "python", "manage.py", "runserver"];

  /**
   * Process any parameters. Any arguments found here will be removed from
   * the parameters list so other parameters continue to be passed to the
   * command.
   **/
  const parameters = process.argv.splice(2);
  for (let i = 0; i < parameters.length; i++) {
    /* May be included because this is the default gulp command. */
    if (parameters[i] === "runserver") {
      delete parameters[i];
    } else if (parameters[i] === "--ip") {
      /* "--ip" parameter to set the server IP address. */
      command.push(parameters[i + 1]);
      delete parameters[i];
      delete parameters[i + 1];
      i++;
    }
  }

  /* Add parameters to command, removing empty values. */
  command = command.concat(parameters.filter(String));

  spawn("pipenv", command, { stdio: "inherit" }).on("exit", cb);
});

gulp.task("generateschema", () => {
  return _runInPipenv([
    "python",
    "manage.py",
    "generateschema",
    "--title",
    "Baby Buddy API",
    "--file",
    "openapi-schema.yml",
  ]);
});

/**
 * Gulp commands.
 */

gulp.task("clean", clean);

gulp.task("coverage", coverage);

gulp.task("docs:build", docsBuild);

gulp.task("docs:deploy", docsDeploy);

gulp.task("docs:watch", docsWatch);

gulp.task("extras", extras);

gulp.task("format", format);

gulp.task("lint", lint);

gulp.task("scripts", scripts);

gulp.task("styles", styles);

gulp.task("test", test);

gulp.task("updateglyphs", updateGlyphs);

gulp.task("watch", watch);

/**
 * Gulp compound commands.
 */

gulp.task("build", gulp.parallel("extras", "scripts", "styles"));

gulp.task(
  "updatestatic",
  gulp.series("lint", "clean", "build", "collectstatic"),
);

gulp.task("default", gulp.series("build", gulp.parallel("watch", "runserver")));