// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License.  You may obtain a copy
// of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
// License for the specific language governing permissions and limitations under
// the License.

// Usage: The passed in function is called when the page is ready.
// CouchApp passes in the app object, which takes care of linking to 
// the proper database, and provides access to the CouchApp helpers.
// $.CouchApp(function(app) {
//    app.db.view(...)
//    ...
// });

(function($) {

  function f(n) {    // Format integers to have at least two digits.
      return n < 10 ? '0' + n : n;
  }

  Date.prototype.toJSON = function() {
      return this.getUTCFullYear()   + '/' +
           f(this.getUTCMonth() + 1) + '/' +
           f(this.getUTCDate())      + ' ' +
           f(this.getUTCHours())     + ':' +
           f(this.getUTCMinutes())   + ':' +
           f(this.getUTCSeconds())   + ' +0000';
  };
  
  function Design(db, name) {
    this.view = function(view, opts) {
      db.view(name+'/'+view, opts);
    };
  };

  var login;
  
  function init(app) {
    $(function() {
      var dbname = document.location.href.split('/')[3];
      var dname = unescape(document.location.href).split('/')[5];
      var db = $.couch.db(dbname);
      var design = new Design(db, dname);
      
      // docForm applies CouchDB behavior to HTML forms.
      function docForm(formSelector, opts) {
        var localFormDoc = {};
        opts = opts || {};
        opts.fields = opts.fields || [];
        
        // turn the form into deep json
        // field names like 'author-email' get turned into json like
        // {"author":{"email":"quentin@example.com"}}
        // Note: Fields not found in form are ignored.
        function formToDeepJSON(form, fields, doc) {
          var form = $(form);
          fields.forEach(function(field) {
            var elem = form.find("[name="+field+"]");
            if (!elem) return;
            var parts = field.split('-');
            var frontObj = doc, frontName = parts.shift();
            while (parts.length > 0) {
              frontObj[frontName] = frontObj[frontName] || {}
              frontObj = frontObj[frontName];
              frontName = parts.shift();
            }
            frontObj[frontName] = elem.val();
          });
        };
        
        // Apply the behavior
        $(formSelector).submit(function(e) {
          e.preventDefault();
          // formToDeepJSON acts on localFormDoc by reference
          formToDeepJSON(this, opts.fields, localFormDoc);
          if (opts.beforeSave) opts.beforeSave(localFormDoc);
          db.saveDoc(localFormDoc, {
            success : function(resp) {
              if (opts.success) opts.success(resp, localFormDoc);
            }
          })
          
          return false;
        });

        // populate form from an existing doc
        function docToForm(doc) {
          var form = $(formSelector);
          // fills in forms
          opts.fields.forEach(function(field) {
            var parts = field.split('-');
            var frontObj = doc, frontName = parts.shift();
            while (frontObj && parts.length > 0) {                
              frontObj = frontObj[frontName];
              frontName = parts.shift();
            }
            if (frontObj && frontObj[frontName])
              form.find("[name="+field+"]").val(frontObj[frontName]);
          });            
        };
        
        if (opts.id) {
          db.openDoc(opts.id, {
            success: function(doc) {
              if (opts.onLoad) opts.onLoad(doc);
              localFormDoc = doc;
              docToForm(doc);
          }});
        } else if (opts.template) {
          if (opts.onLoad) opts.onLoad(opts.template);
          localFormDoc = opts.template;
          docToForm(localFormDoc);
        }
        var instance = {
          deleteDoc : function(opts) {
            opts = opts || {};
            if (confirm("Really delete this document?")) {                
              db.removeDoc(localFormDoc, opts);
            }
          },
          localDoc : function() {
            formToDeepJSON(formSelector, opts.fields, localFormDoc);
            return localFormDoc;
          }
        }
        return instance;
      }
      
      function prettyDate(time){
      	var date = new Date(time),
      		diff = (((new Date()).getTime() - date.getTime()) / 1000),
      		day_diff = Math.floor(diff / 86400);

      	return day_diff < 1 && (
      			diff < 60 && "just now" ||
      			diff < 120 && "1 minute ago" ||
      			diff < 3600 && Math.floor( diff / 60 ) + " minutes ago" ||
      			diff < 7200 && "1 hour ago" ||
      			diff < 86400 && Math.floor( diff / 3600 ) + " hours ago") ||
      		day_diff == 1 && "yesterday" ||
      		day_diff < 21 && day_diff + " days ago" ||
      		day_diff < 45 && Math.ceil( day_diff / 7 ) + " weeks ago" ||
      		day_diff < 730 && Math.ceil( day_diff / 31 ) + " months ago" ||
      		Math.ceil( day_diff / 365 ) + " years ago";
      };
      
      app({
        showPath : function(funcname, docid) {
          // I wish this was shared with path.js...
          return '/'+[dbname, '_design', dname, '_show', funcname, docid].join('/')
        },
        listPath : function(funcname, viewname) {
          return '/'+[dbname, '_design', dname, '_list', funcname, viewname].join('/')
        },
        slugifyString : function(string) {
          return string.replace(/\W/g,'-').
            replace(/\-*$/,'').replace(/^\-*/,'').
            replace(/\-{2,}/,'-');
        },
        attemptLogin : function(win, fail) {
          // depends on nasty hack in blog validation function
          db.saveDoc({"author":"_self"}, { error: function(s, e, r) {
            var namep = r.split(':');
            if (namep[0] == '_self') {
              login = namep.pop();
              $.cookies.set("login", login, '/'+dbname)
              win && win(login);
            } else {
              $.cookies.set("login", "", '/'+dbname)
              fail && fail(s, e, r);
            }
          }});        
        },
        loggedInNow : function(loggedIn, loggedOut) {
          login = login || $.cookies.get("login");
          if (login) {
            loggedIn && loggedIn(login);
          } else {
            loggedOut && loggedOut();
          }
        },
        db : db,
        design : design,
        view : design.view,
        docForm : docForm,
        prettyDate : prettyDate
      });
    });
  };

  $.CouchApp = $.CouchApp || init;

})(jQuery);