/**
 * Expose `Collection`.
 */

module.exports = Collection;

/**
 * Module dependencies.
 */
 
var Resource = require('resource')
  , debug = require('debug')('collection')
  , util = require('util')
  , inherits = util.inherits
  , assert = require('assert');
  
/**
 * Create a new `Collection` with the given `options`.
 *
 * @param {Object} options
 * @return {Collection}
 */

function Collection(options) {
  Resource.apply(this, arguments);
  
  this.options = options;
  
  // model
  this.model = this.dependencies.model.schema;
  
  // setup http routes
  this.setupRoutes(this.app);
  
  debug('created with options', options);
}

/**
 * Inherit from `Resource`.
 */

inherits(Collection, Resource);

/**
 * Dependencies.
 */

Collection.dependencies = {
  'model': 'model'
}
 
Collection.prototype.setupRoutes = function (app) {
  var Model = this.model;
  var ctx;
  var collection = this;
  
  app.use(function (req, res, next) {
    ctx = collection.createContext(req, res, next);
    
    ctx.emit('request', function () {
      ctx.emit(req.method.toLowerCase(), function () {
        next();
      });
    });
  });
  
  // create
  app.post('/', create);
  app.post('/new', create);
  
  function create(req, res, next) {
    ctx.emit('create', function (done) {
      Model.create(req.body, done);
    });
  }
  
  // read
  app.get('/:id', query);
  app.get('/', query);
  
  function query(req, res, next) {
    var query = req.query;
    query.where = query.where || {};
  
    if(req.param('id')) {
      query.where.id = req.param('id');
    }
    if(query.where.id) {
      query.limit = 1;
    }
    
    if(query.limit) query.limit = Number(query.limit);
    if(query.skip) query.skip = Number(query.skip);
    
    ctx.emit('query', query, function (done) {
      Model.all(query, done);
    });
  }
  
  // update
  app.put('/:id', function (req, res) {
    var body = req.body || {};
    var id = req.param('id');
    
    if(Number(id) == id) {
      id = Number(id);
    }
    
    ctx.emit('find', function () {
      Model.find(id, function (err, m) {
        if(err) {
          ctx.done(err);
        } else {
          ctx.emit('validate', body, function () {
            ctx.emit('update', body, function (done) {
              m.updateAttributes(body, done);
            });
          });  
        }
      });
    });
  });
  
  // delete
  app.del('/:id', function () {
    var id = req.param('id');
    
    ctx.emit('delete', id, function (done) {
      Model.destroy(id, done);
    });
  });
}