sprity/sprity

'use strict';

var Promise = require('bluebird');
var through2 = require('through2');
var imageinfo = require('imageinfo');
var parsePath = require('parse-filepath');
var fs = Promise.promisifyAll(require('fs-extra'));

var Err = require('./util/error');
var log;

var createTileObj = function (image, opt) {
  return function (stats) {
    if (stats.isFile()) {
      var info = imageinfo(image.contents);
      if (info) {
        var name, base;
        if (opt.split) {
          var imagePath = parsePath(image.relative);
          base = imagePath.dirname.replace(/\/|\\|\ /g, '-');
          name = imagePath.name.replace(/\/|\\|\ /g, '-');
        }
        else {
          base = image.base;
          name = parsePath(image.relative.replace(/\/|\\|\ /g, '-')).name;
        }
        var tileObj = {
          base: base,
          contents: image.contents,
          fileName: image.relative,
          height: info.height,
          name: name,
          path: image.path,
          type: info.format.toLowerCase(),
          width: info.width
        };
        return Promise.resolve(tileObj);
      }
      else {
        throw new Err.TileError(image.path + ' is not an image', image);
      }
    }
    else {
      throw new Err.TileError(image.path + ' does not exist', image);
    }
  };
};

module.exports = function (opt) {
  log = opt.logger;

  return through2.obj(function (image, enc, cb) {
    if (image instanceof Error) {
      cb(image);
    }
    else {
      fs.statAsync(image.path)
        .then(createTileObj(image, opt))
        .then(function (tile) {
          cb(null, tile);
        })
        .catch(Err.TileError, function (err) {
          log.warn('Ignoring ' + err.image.path);
          cb(null, null);
        });
    }
  });
};