/*
This is a modified version of rollup-plugin-scss
Copyright (c) 2016 Thomas Ghysels
https://github.com/thgh/rollup-plugin-scss
 */

function includeSass(options = {}) {
  let dest = typeof options.output === "string" ? options.output : null;
  const prefix = options.prefix ? options.prefix + "\n" : "";
  let includePaths = options.includePaths || ["node_modules/"];
  includePaths.push(process.cwd());

  const compileToCSS = async function (file) {
    // Compile SASS to CSS
    if (file.length) {
      includePaths = includePaths.filter((v, i, a) => a.indexOf(v) === i);
      try {
        const sass = options.sass || loadSassLibrary();
        const render = sass.renderSync(
          Object.assign(
            {
              file,
              outFile: dest,
              includePaths,
              importer: (url, prev, done) => {
                /* If a path begins with `.`, then it's a local import and this
                 * importer cannot handle it. This check covers both `.` and
                 * `..`.
                 *
                 * Additionally, if an import path begins with `url` or `http`,
                 * then it's a remote import, this importer also cannot handle
                 * that. */
                if (
                  url.startsWith(".") ||
                  url.startsWith("url") ||
                  url.startsWith("http")
                ) {
                  /* The importer returns `null` to defer processing the import
                   * back to the sass compiler. */
                  return null;
                }
                /* If the requested path begins with a `~`, we remove it. This
                 * character is used by webpack-contrib's sass-loader to
                 * indicate the import is from the node_modules folder. Since
                 * this is so standard in the JS world, the importer supports
                 * it, by removing it and ignoring it. */
                const cleanUrl = url.startsWith("~") ? url.replace("~", "") : url;
                /* Now, the importer uses `require.resolve()` to attempt
                 * to resolve the path to the requested file. In the case
                 * of a standard node_modules project, this will use Node's
                 * `require.resolve()`. In the case of a Plug 'n Play project,
                 * this will use the `require.resolve()` provided by the
                 * package manager.
                 *
                 * This statement is surrounded by a try/catch block because
                 * if Node or the package manager cannot resolve the requested
                 * file, they will throw an error, so the importer needs to
                 * defer to sass, by returning `null`.
                 *
                 * The paths property tells `require.resolve()` where to begin
                 * resolution (i.e. who is requesting the file). */
                try {
                  const resolved = require.resolve(cleanUrl, {
                    paths: [prefix + scss],
                  });
                  /* Since `require.resolve()` will throw an error if a file
                   * doesn't exist. It's safe to assume the file exists and
                   * pass it off to the sass compiler. */
                  return { file: resolved };
                } catch (e) {
                  /* Just because `require.resolve()` couldn't find the file
                   * doesn't mean it doesn't exist. It may still be a local
                   * import that just doesn't list a relative path, so defer
                   * processing back to sass by returning `null` */
                  return null;
                }
              },
            },
            options
          )
        );
        const css = render.css.toString();
        const map = render.map ? render.map.toString() : "";
        // Possibly process CSS (e.g. by PostCSS)
        if (typeof options.processor === "function") {
          const result = await options.processor(css, map, styles);
          // TODO: figure out how to check for
          // @ts-ignore
          const postcss = result;
          // PostCSS support
          if (typeof postcss.process === "function") {
            return Promise.resolve(
              postcss.process(css, {
                from: undefined,
                to: dest,
                map: map ? { prev: map, inline: false } : null,
              })
            );
          }
          // @ts-ignore
          return stringToCSS(result);
        }
        return { css, map };
      } catch (e) {
        if (options.failOnError) {
          throw e;
        }
        console.log();
        console.log(red("Error:\n\t" + e.message));
        if (e.message.includes("Invalid CSS")) {
          console.log(green("Solution:\n\t" + "fix your Sass code"));
          console.log("Line:   " + e.line);
          console.log("Column: " + e.column);
        }
        if (e.message.includes("sass") && e.message.includes("find module")) {
          console.log(green("Solution:\n\t" + "npm install --save-dev sass"));
        }
        if (e.message.includes("node-sass") && e.message.includes("bindings")) {
          console.log(green("Solution:\n\t" + "npm rebuild node-sass --force"));
        }
        console.log();
      }
    }
    return { css: "", map: "" };
  };

  return {
    name: "includeSass",

    buildStart() {
      this.addWatchFile(options.file);
    },

    async generateBundle(opts, bundle) {
      const compiled = await compileToCSS(options.file);
      if (typeof compiled !== "object" || typeof compiled.css !== "string") {
        return;
      }

      // Emit styles through callback
      if (typeof options.output === "function") {
        options.output(compiled.css, bundle);
      }
    },
  };
}

function loadSassLibrary() {
  try {
    return require("sass");
  } catch (e) {
    return require("node-sass");
  }
}
function stringToCSS(input) {
  if (typeof input === "string") {
    return { css: input, map: "" };
  }
  return input;
}
function red(text) {
  return "\x1b[1m\x1b[31m" + text + "\x1b[0m";
}
function green(text) {
  return "\x1b[1m\x1b[32m" + text + "\x1b[0m";
}

export default includeSass;