// Models should live in ./models
// ClientModelFactory.makeAll() will generate the client-side source for models, with
// only properties defined in the constructor's __exports__ array property.

var util = require('util'),
      fs = require('fs');

var EXTENDS_REGEX = /@extends (.+)/,
         JS_REGEX = /^[a-zA-Z0-9_\-]+\.js$/;

function log(s) {
  util.puts('[ClientModelFactory] ' + s);
}

function serialize(object, name, property) {
  if(property in object) {
    return name + '.' + property + ' = ' + object[property] + ';\n';
  } else if(property in object.prototype) {
    return name + '.prototype.' + property + ' = ' + object.prototype[property] + ';\n';
  } else {
    return '';
  }
}

function ClientModelFactory(modelpath) {
  this.models = {};

  var files = fs.readdirSync(modelpath);

  for(var i = 0; i < files.length; i++) {
    if(!files[i].match(JS_REGEX))
      continue;

    var name = files[i].replace('.js', '');
    log('loading model file: ' + files[i]);

    var module;

    try {
      module = require(modelpath + files[i]);
    } catch(e) {
      log('  skipping due to exception: ' + e);
      continue;
    }

    this.models[name] = '';

    for(var export in module) {
      if(typeof module[export] != 'function')
        continue;

      if('__exports__' in module[export]) {
        // constructor
        this.models[name] += module[export] + "\n";

        // handle inheritance using ghetto @extends comments
        var match = (''+module[export]).match(EXTENDS_REGEX);
        if(match) {
          this.models[name] += this.extend(export, match[1]);
        }

        var export_list = module[export]['__exports__'];
        for(var j = 0; j < export_list.length; j++) {
          var prop = export_list[j];

          if(typeof prop == 'function') { // regular expression
            for(var p in module[export]) {
              if(module[export].hasOwnProperty(p) && p.match(prop))
                this.models[name] += serialize(module[export], export, p);
            }
          } else if(typeof prop == 'string') { // exact string
            this.models[name] += serialize(module[export], export, prop);
          }
        }
      }
    }
  }
}

ClientModelFactory.prototype.extend = function extend(child, parent) {
  // this code is inserted immediately after a constructor
  return child + '.prototype = ' + parent + '.prototype;\n';
};

ClientModelFactory.prototype.make = function make(model) {
  return this.models[model];
};

ClientModelFactory.prototype.makeAll = function makeAll() {
  var sources = [];

  for(var model in this.models) {
    sources.push(this.make(model));
  }

  return sources.join('');
};

exports.ClientModelFactory = global['ClientModelFactory'] || (global['ClientModelFactory'] = new ClientModelFactory(__dirname + '/models/'));