"use strict";

const db = require("sequelize"),
  Promise = require("bluebird"),
  fs = require("fs"),
  config = require("config");

let scanning = 0;

const picturesPath = config.get("picturesPath");

function scanFile(path, stats) {
  return new Promise(function(resolve, reject) {
    const meta = { filepath: path };
    console.log("Scanning file: " + path);
    meta.created = stats.ctime;
    return resolve(meta);
  });
}

function scanDir(path) {
  return new Promise(function(resolve, reject) {
    const meta = { filepath: path, files: [], paths: [] };

    console.log("Scanning path " + path);

    fs.readdir(path, function(err, files) {
      if (err) {
        console.warn(" Could not readdir " + path);
        return resolve(null);
      }

      scanning++;

      return Promise.map(files, function(file) {
        let filepath = path + "/" + file;


        return new Promise(function(resolve, reject) {
          fs.stat(filepath, function(err, stats) {
            if (err) {
              console.warn("Could not stat " + filepath);
              return resolve(null);
            }

            if (stats.isDirectory()) {
              return scanDir(filepath, stats).then(function(entry) {
                if (entry && (entry.files.length || entry.paths.length)) {
                  meta.paths.push(entry);
                }
                return resolve(entry);
              });
            }

            /* stats.isFile()  */
            return scanFile(filepath, stats).then(function(entry) {
              if (entry) {
                meta.files.push(entry);
              }
              return resolve(entry);
            });
          });
        });
      }, {
        concurrency: 10
      }).then(function() {
        scanning--;
        if (scanning == 0) {
          const endStamp = Date.now();
          console.log("Scanning completed in " + Math.round(((endStamp - startStamp))) + "ms.");
        }
      }).then(function() {
        return resolve(meta);
      });
    });
  });
}

const startStamp = Date.now();

module.exports = scanDir(picturesPath);