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/* @flow */
"use strict";

const autoSyntax = require("postcss-syntax");
const dynamicRequire = require("./dynamicRequire");
const fs = require("fs");
const LazyResult = require("postcss/lib/lazy-result");
const postcss = require("postcss");

const postcssProcessor = postcss();

module.exports = function(
  stylelint /*: stylelint$internalApi*/
) /*: Promise<?Object>*/ {
  const options /*: {
    code?: string,
    codeFilename?: string,
    filePath?: string,
    codeProcessors?: Array<Function>,
    syntax?: stylelint$syntaxes,
    customSyntax?: string
  }*/ =
    arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

  const cached /*: ?postcss$result*/ = stylelint._postcssResultCache.get(
    options.filePath
  );

  if (cached) return Promise.resolve(cached);

  let getCode;

  if (options.code !== undefined) {
    getCode = Promise.resolve(options.code);
  } else if (options.filePath) {
    getCode = readFile(options.filePath);
  }

  if (!getCode) {
    throw new Error("code or filePath required");
  }

  return getCode
    .then(code => {
      const customSyntax = stylelint._options.customSyntax;
      let syntax = stylelint._options.syntax;

      if (customSyntax) {
        try {
          syntax = dynamicRequire(customSyntax);
        } catch (e) {
          throw new Error(
            `Cannot resolve custom syntax module ${customSyntax}`
          );
        }

        /*
         * PostCSS allows for syntaxes that only contain a parser, however,
         * it then expects the syntax to be set as the `parser` option rather than `syntax.
         */
        if (!syntax.parse) {
          syntax = {
            parse: syntax,
            stringify: postcss.stringify
          };
        }
      } else if (syntax) {
        switch (syntax) {
          case "css-in-js": {
            syntax = "postcss-jsx";
            break;
          }
          case "html":
          case "less":
          case "markdown":
          case "sass":
          case "scss": {
            syntax = "postcss-" + syntax;
            break;
          }
          case "sugarss": {
            break;
          }
          default: {
            throw new Error(
              "You must use a valid syntax option, either: css-in-js, html, less, markdown, sass, scss or sugarss"
            );
          }
        }

        syntax = dynamicRequire(syntax);
      } else if (
        !(options.codeProcessors && options.codeProcessors.length) ||
        (options.filePath && /\.(scss|sass|less)$/.test(options.filePath))
      ) {
        syntax = autoSyntax({
          css: {
            parse: stylelint._options.fix
              ? dynamicRequire("postcss-safe-parser")
              : postcss.parse,
            stringify: postcss.stringify
          }
        });
      }

      const postcssOptions /*: postcss$options*/ = {
        from: options.filePath,
        syntax
      };

      const source = options.code ? options.codeFilename : options.filePath;
      let preProcessedCode = code;

      if (options.codeProcessors && options.codeProcessors.length) {
        if (stylelint._options.fix) {
          // eslint-disable-next-line no-console
          console.warn(
            "Autofix is incompatible with processors and will be disabled. Are you sure you need a processor?"
          );
          stylelint._options.fix = false;
        }

        options.codeProcessors.forEach(codeProcessor => {
          preProcessedCode = codeProcessor(preProcessedCode, source);
        });
      }

      const result = new LazyResult(
        postcssProcessor,
        preProcessedCode,
        postcssOptions
      );

      return result;
    })
    .then(postcssResult => {
      stylelint._postcssResultCache.set(options.filePath, postcssResult);

      return postcssResult;
    });
};

function readFile(filePath /*: string*/) /*: Promise<string>*/ {
  return new Promise((resolve, reject) => {
    fs.readFile(filePath, "utf8", (err, content) => {
      if (err) {
        return reject(err);
      }

      resolve(content);
    });
  });
}