const fs = require("fs"),
    utils = require("./utils"),
    caching = require("./caching"),

// pp (preprocessors)
    pp_html = require("./pp_html"),
    pp_sass = require("node-sass"),

    pp_config = {
        ".sass": "sass",
        ".html": "html",
        ".htm": "hmtl"
    };
let logger = require("winston");

/**
 * Sets the logger for logging
 * @param  {Object} newLogger
 */
exports.setLogger = function (newLogger) {
    logger = newLogger;
    caching.setLogger(logger);
};

/**
 * Returns the data for the file. In some cases the data is processed or loaded from cache.
 * @param  {String} filename The file containing the data
 * @return {String}          The data that should be send
 */
exports.getProcessed = function (filename) {
    logger.debug("Processing File %s", filename);
    let extension = utils.getExtension(filename); // use the utils function to get the files extension
    let data = null;
    if (caching.isCached(filename)) return caching.getCached(filename) // return the cached file if it exists
    logger.debug("File is not cached. Processing...");
    switch (pp_config[extension]) {
        case "sass":
            logger.debug("Processing sass %s", filename);
            data = Buffer.from(pp_sass.renderSync({ // use the sass preprocessor
                file: filename
            }).css).toString("utf-8");
            break;
        case "html":
            logger.debug("Processing html %s", filename);
            data = pp_html.formatHtml(filename); // use the html-preprocessor
            break;
        default:
            logger.debug("No processor found for %s. Returning data.", filename);
            return fs.readFileSync(filename); // just read the data from the file
    }
    caching.cache(filename, data); // cache the file for faster access next time
    logger.debug("Cached file %s", filename);
    return data; // return the data
};

/**
 * Cleanup function that calls the cleanup for the caching module
 */
exports.cleanup = function() {
    caching.cleanup();
};