/*

This is the core logic for the main page.
It implements most page transitions by showing and hiding DIV elements
in the page with javascript+jquery

*/


/* Convert a JSON string to an object, or null if unparseable */
function j2o(json) { try { return JSON.parse(json); } catch(e) { return null; } }

/* Convert an object to a JSON string (just easier to type than "JSON.stringify" */
function o2j(obj) { return JSON.stringify(obj); }

var
user = {},

router = {

    routes: {},

    add: function(name, useAjax, cb) {
        if (typeof useAjax === 'function') {
            cb = useAjax;
            useAjax = true;
        }

        this.routes[name] = {
            fn: cb,
            useAjax: useAjax
        }
    },

    run: function(name, path) {

        $('.nav').removeClass('active');

        checkUser( function() {

            if (router.routes[name].useAjax) {

                $.get(
                    path,
                    {cache: false},
                    function(data) {

                        if (data.status === 'not_found' || (typeof data === 'string')) {
                            return router.run('404');
                        }
                        router.routes[name].fn(data, render);
                    }
                );
            } else {
                router.routes[name].fn(render);
            }
        });
    }
}

function tmpl_render() {
  if (user.name) {
    $('.username').text(user.name).attr('href', '/profile');
    $("#login_status").show();
    $('#login_link').text('Logout').attr('href', '/logout');
    $('#register_link').hide();
		$('#sign_up-link').hide();
  } else {
    $('.username').text('Guest');
    $("#login_status").hide();
    $('#login_link').text('Login').attr('href', '/login');
    $('#register_link').show();
		$('#sign_up-link').show();
  }
};

function render(pageId, response) {
  console.log(user);
  if (user.name) {
    $('.username').text(user.name).attr('href', '/profile');
    $("#login_status").show();
    $('#login_link').text('Logout').attr('href', '/logout');
    $('#register_link').hide();
		$('#sign_up-link').hide();
  } else {
    $('.username').text('Guest');
    $("#login_status").hide();
    $('#login_link').text('Login').attr('href', '/login');
    $('#register_link').show();
		$('#sign_up-link').show();
  }

  if (response) {
    if (response instanceof Array) {
      $.each(response, function() {
        ProtoDiv.reset("PROTO_" + this.id)
        ProtoDiv.replicate("PROTO_" + this.id, this.data)
      })
    } else {
      ProtoDiv.reset("PROTO_" + response.id)
      ProtoDiv.replicate("PROTO_" + response.id, response.data)
    }
  }
	$("#pg_" + pageId).fadeIn(function() {
		$("#g-footer").fadeIn(); // we don't want the footer jumping up and down
	});
}

function message(type, msg) {
  ProtoDiv.reset("PROTO_message");
  ProtoDiv.replicate("PROTO_message", {type: type, msg: msg})
  $("#messages").fadeIn(100);
}

function checkUser(cb) {
  $.get('/checkuser', function(data) {
    console.log(data);
    if (data.user) {
      user = data.user;
    } else {
      user = {};
    }

    if (cb) {
      cb();
    }
  })
}

router.add('404', false, function() {
  $("#pg_notfound").fadeIn(100);
  window.scroll(0, 0)
});

// Legal page
router.add('legal', false, function() {
  $("#pg_legal").fadeIn(100);
});


// Team Page
router.add('team', false, function() {
  $("#pg_team").fadeIn(100);
});

// Contact Page

router.add('contact', false, function() {
  $("#pg_contact").fadeIn(100);
});

// About Page
router.add('about', false, function() {
  $("#pg_about").fadeIn(100);
});

router.add('home', false, function(cb) {
  $('#learnsomething').unbind();
  $('.nav').removeClass('active');
	cb("home");
  $('#signup').click(function(e) {
    goPage('/register');
  });
  $('#learnsomething').click(function(e) {
    $.get('/learn/random', function(data) {
      if (data.status === 'ok') {
        goPage(data.data);
      }
    })
  });
  if ($('#vimeo-screencast').length === 0) {
    $('.video-wrapper').html('<iframe id="vimeo-screencast" src="http://player.vimeo.com/video/30647271?title=0&amp;byline=0&amp;portrait=0&amp;color=367da9" width="400" height="225" frameborder="0" webkitAllowFullScreen allowFullScreen></iframe>');
  }
});

// go to the page that lists the schools
router.add('schools', function(data, cb) {

  $('#school_link').addClass('active');
  tmpl_render();

  var response = {
    id: 'school',
    data: data.schools
  }

  $('#pg_schools').fadeIn(function() {
      $('#g-footer').fadeIn();
  });
  $('#schoolTmpl').tmpl( data.schools ).appendTo("#pg_schools #schools");
});

// go to the page that lists the courses for a specific school
router.add('school', function(data, cb) {
  $('#school_link').addClass('active');
  $('.sub_menu').hide();
  //$('#new_course').unbind();
  $('#form_course').hide().unbind();

  response = {
    id: 'course',
    data: data.school.courses
  }

  $('#pg_courses').fadeIn(function() {
      $('#g-footer').fadeIn();
  });
  $("#school_name").html(data.school.name);

  if (data.school.authorized) {
    $('.sub_menu').show();
    var form = $('#form_course');

    form.toggle();

    form.submit(function(e) {
      e.preventDefault();

      $.post(window.location.pathname, form.serialize(), function(data) {
        if (data.status === 'error') {
          message('error', data.message);
        } else if (data.status === 'ok') {
          form.hide();
          goPage(window.location.pathname);
          message('info', data.message);
        }
      });
    })
  }

  $('#courseTmpl').tmpl( data.school.courses ).appendTo("#pg_courses #main-content");
});

// go to the page that lists the lectures for a specific course
router.add('course', function(data, cb) {
  $('#school_link').addClass('active');
  $('.sub_menu').hide();
  $('#new_lecture').unbind();

  var response = [];

  if (data.course) {
    response.push({
      id: 'lectures_head',
      data: data.course
    })
  }

  if (data.instructor) {
    response.push({
      id: 'lectures_instructor',
      data: data.instructor
    })
  }

  if (data.lectures) {
    response.push({
      id: 'lecture',
      data: data.lectures.map(function(lecture) {
        var date = new Date(lecture.date);
        lecture.date = date.toDateString();
        return lecture;
      })
    })
  }
  cb('lectures', response);

  if (!data.instructor.email) {
    $('.instructor_email').hide();
  } else {
    $('.instructor_email').show();
  }

  if (data.course.authorized) {
    $('.sub_menu').show();
		var form = $('#form_lecture');

		form.show();

		form.submit(function(e) {
			e.preventDefault();

			$.post(window.location.pathname, form.serialize(), function(data) {
				if (data.status === 'error') {
					message('error', data.message);
				} else if (data.status === 'ok') {
					form.hide();
					goPage(window.location.pathname);
					message('info', data.message);
				}
			});
		})
  }
});



// go to the page that lists the note taking sessions for a specific lecture
router.add('lecture', function(data, cb) {
  $('#school_link').addClass('active');
  $('.sub_menu').hide();
  $('#new_note').unbind();
  $('#form_note').hide().unbind();;

  var response = [];

  if (data.course) {
    response.push({
      id: 'notes_head',
      data: data.course
    })
  }

  if (data.instructor) {
    response.push({
      id: 'notes_instructor',
      data: data.instructor
    })
  }

  if (data.notes) {
    response.push({
      id: 'note',
      data: data.notes
    })
  }
  
  cb("notes", response);

  if (!data.instructor.email) {
    $('.instructor_email').hide();
  } else {
    $('.instructor_email').show();
  }
  
  if (data.lecture.authorized) {

		var form = $('#form_note').show();

		form.submit(function(e) {
			e.preventDefault();

			$.post(window.location.pathname, form.serialize(), function(data) {
				if (data.status === 'error') {
					message('error', data.message);
				} else if (data.status === 'ok') {
					form.hide();
					goPage(window.location.pathname);
					message('info', data.message);
				}
			});
		})
  }
});


// go to the page that lists the archived subject names
router.add('archive', function(data, cb) {
  $('#archive_link').addClass('active');

  var response = {
    id: 'archive_subject',
    data: data.subjects
  }

  cb("archive_subjects", response)
});



router.add('archivesubject', function(data, cb) {
  $('.nav').removeClass('active');
  $('#archive_link').addClass('active');

  var response = {
    id: 'archive_course',
    data: data.courses
  }

  cb("archive_courses", response)
});



router.add('archivecourse', function(data, cb) {
  $('#archive_link').addClass('active');

  var response = {
    id: 'archive_note',
    data: data.notes
  }

  cb("archive_notes", response)
});



router.add('archivenote', function(data, cb) {
  $('#archive_link').addClass('active');

  var response = {
    id: 'archive_note_display',
    data: data.note
  }

  cb("archive_note_display", response)
});



// go to the account registration page
router.add('register', false, function(cb) {
  $('#register_link').addClass('active');
  $('#form_register').submit(function(e) {
    e.preventDefault();

    var form = $(this);

    $.post(window.location.pathname, form.serialize(), function(data) {
      if (data.status === 'error') {
        message('error', data.message);
        return false;
      } else if (data.status === 'ok') {
        goPage('/')
        message('info', data.message);
      }
    })
  })
	cb("register");
});

router.add('activate', function(data, cb) {
  goPage('/')
  message('info', data.message);
});

router.add('profile', false, function(cb) {
  $('#profile_link').addClass('active');
  var form = $('#form_profile');
  $('input[type=password]','#form_profile').val('');
  $('#affiliation').attr('value', user.affil);
  $('#showName').attr('checked', user.showName)
  form.find('.email').text(user.email);
  form.find('input[name=name]').val(user.name);
  form.submit(function(e) {
    e.preventDefault();

    $.post(window.location.pathname, form.serialize(), function(data) {
      if (data.status === 'error') {
        message('error', data.message);
        return false;
      } else if (data.status === 'ok') {
        goPage('/profile');
        message('info', data.message);
      }
    })
  })
	cb("profile");
});

router.add('login', false, function(cb) {
  $('input','#form_login').val('');
  $('#form_login').submit(function(e) {
    e.preventDefault();

    var form = $(this);

    $.post(window.location.pathname, form.serialize(), function(data) {
      if (data.status === 'error') {
        message('error', data.message);
        return false;
      } else if (data.status === 'ok') {
        goPage('/')
        message('info', 'Successfully logged in');
      }
    })
  })
	cb("login");
});

router.add('logout', function(data, cb) {
  goPage('/')
  message('info', 'Successfully logged out');
});

router.add('resetpass', false, function(cb) {
  $('input','#form_resetpass').val('');
  $('#form_resetpass').submit(function(e) {
    e.preventDefault();

    var form = $(this);

    $.post(window.location.pathname, form.serialize(), function(data) {
      if (data.status === 'error') {
        message('error', data.message);
        return false;
      } else if (data.status === 'ok') {
        goPage('/')
        message('info', data.message);
      }
    })
  })
	cb("resetpass");
});

router.add('resetpw', false, function(cb) {
  $('input','#form_resetpw').val('');
  $('#form_resetpw').submit(function(e) {
    e.preventDefault();

    var form = $(this);

    $.post(window.location.pathname, form.serialize(), function(data) {
      if (data.status === 'error') {
        message('error', data.message);
        return false;
      } else if (data.status === 'ok') {
        goPage('/')
        message('info', data.message);
      }
    })
  })
	cb("resetpw");
});

// go to the press articles page
router.add('press', false, function(cb) {
  $('#press_link').addClass('active');
	cb("press");
});


// go to the "code of conduct" page
router.add('conduct', false, function(cb) {
	cb("conduct");
});



/* Do and show the appropriate thing, based on the pages current URL */
function showPage(y) {

    $('.page').hide(); //(100);// hide all pseudo pages
		$('#g-footer').hide();

    var
    path = document.location.pathname,
    routes = router.routes,
    slugs = path.split('/');

    slugs.shift();

    var mainSlug = slugs[0].toLowerCase() || 'home';
		console.log(slugs[0].toLowerCase());

    if (mainSlug === 'archive') {
        if (slugs[1]) {
            mainSlug = mainSlug + slugs[1];
        }
    }

    if (routes[mainSlug]) {
        router.run(mainSlug, path)
    } else {
        router.run('404')
    }
}




/* Simulates a page load.
	'path' is something like "/schools", etc.
	A page fetch doesn't really happen.
	Based on what path looks like, an appropriate DIV is shown, and action taken
*/
var topQueue = [0]
function goPage(path) {
  if (history.pushState !== undefined) {
    topQueue.push(window.pageYOffset)
    history.pushState({}, path, path);
    showPage(0);
  } else {
    document.location = path;
  }
}

/* Simulates a "back" browser navigation.  */
var popped = false;
function goBack(event) {
  popped = true;
  console.timeEnd('pop')
	showPage( topQueue.pop() );
}

console.time('pop')
console.time('no-pop')
window.onpopstate = goBack

$(document).ready(function() {

	// This code executes after the page has been fully loaded

  $('body').on('click', 'a[href^=/]', function(e) {
    var path = e.target.pathname || '/';
    var checkNote = path.match(/\/([a-zA-Z]+)/);
    if (checkNote && checkNote[1] == 'note') {
      return true;
    } else if (!history.pushState) {
      return true;
    } else {
      goPage(path)
      return false;
    }
  })

    // xxx older FF browsers don't fire a page load/reload - deal with it somehow.
    // I've increased the timeout, we need to avoid calling showPage twice. It causes page flicker.
  setTimeout(function() {
    console.timeEnd('no-pop')
    if (!popped) {
      showPage( 0 ); // needed for some older browsers, redundant for chrome
    }
  }, 1200)

})