exports.render_event_records = function () {
  console.log('Rendering event records...');
  //console.log(tbl_event);
  //console.log(event_id);
  
  tbl_event.iterate(function(value, key, iteration) {
    if (value.id == event_id) {
      console.log('*** Event id ('+event_id+') found in table.');
      document.getElementById('event_name').innerHTML = '@'+value.name;
    } else {
      console.log('Event not it.');
    }
  }).then(function() {
    console.log('idb_to_ui: Iterate tbl_event_file complete')
    tbl_event_complete = true;
  });
  
}

// NOTE: The event_file table should probably only be looped through once when the table is actually updated.
// NOTE: Not each time the other objects (event, location, session, presentation, presenter) are updated.
exports.render_event_file_records = function (event_files, event_id) {
  console.log('Rendering event file records...');
  
  /*
  tbl_event_file.iterate(function(value, key, iteration) {
    if (value.id == event_id) {
      console.log('*** Event id ('+event_id+') found in table.');
      document.getElementById('event_name').innerHTML = '@'+value.name;
    } else {
      console.log('Event not it.');
    }
  }).then(function() {
    console.log('idb_to_ui: Iterate tbl_event_file complete')
    tbl_event_complete = true;
  });
  
  
  document.getElementById('event_files_menu').innerHTML = '<h2>Event Files</h2>';
  document.getElementById('event_files_menu').innerHTML += '<ul class="list-group list-group-flush">';
  for (var i in launcher_tmp.event_file) {
    document.getElementById('event_files_menu').innerHTML += '<li id="menu_event_file_'+launcher_tmp.event_file[i].event_file_id+'" class="list-group-item btn btn-secondary d-flex justify-content-between align-items-center open_local_file" data-hash_sha256="'+launcher_tmp.event_file[i].hash_sha256+'.file" data-filename="'+launcher_tmp.event_file[i].event_file_filename+'">'+launcher_tmp.event_file[i].event_file_filename+'</li>';
  }
  document.getElementById('event_files_menu').innerHTML += '</ul>';
  
  */
  
}


exports.render_event_location_records = function () {
  console.log('Rendering event location records...');
  
  tbl_event_location.iterate(function(value, key, iteration) {
    if (value.id == event_location_id) {
      console.log('*** Event location id ('+event_location_id+') found in table.');
      document.getElementById('location_name').innerHTML = '<span class="fas fa-map-marker"></span> '+value.name;
    } else {
      console.log('Event location not it.');
    }
  }).then(function() {
    console.log('idb_to_ui: Iterate tbl_event_file complete')
    tbl_event_location_complete = true;
  });
  
}


exports.render_event_location_file_records = function (events) {
  console.log('Rendering event location file records...');
}


exports.render_event_session_records = function () {
  console.log('Rendering event session records...');
  
  // First: update or add sessions
  tbl_event_session.iterate(function(value, key, iteration) {
    if (value.event_id == event_id && value.event_location_id == event_location_id) {
      console.log('*** Event session id ('+value.id+') is part of this event location.');
      
      // *** ** * Checking if the session is already in the launcher menu * ** ***
      if (document.getElementById('menu_event_session_'+value.id)) {
        // Update the session menu list item
        document.getElementById('menu_event_session_'+value.id).innerHTML = value.name;
      } else {
        // Unhide the sessions menu
        if (document.getElementById('sessions_menu').classList.contains('d-none') ) {
          document.getElementById('sessions_menu').classList.remove('d-none');
          document.getElementById('sessions_menu').classList.add('d-block');
        }
        
        // Add the new session to the session menu
        let node = document.createElement('LI');
        node.id = 'menu_event_session_'+value.id;
        node.className = 'list-group-item btn btn-info d-flex justify-content-between align-items-center btn_view_session';
        node.setAttribute('data-session_id', value.id);
        let text_node = document.createTextNode(value.name);
        node.appendChild(text_node);
        
        document.getElementById('sessions_menu').getElementsByTagName('ul')[0].appendChild(node);
      }
      
      let session_startdatetime = new Date(value.start_datetime);
      
      // *** ** * Checking if the session is already in the launcher sessions detail * ** ***
      if (document.getElementById('detail_session_'+value.id)) {
        // Update the launcher sessions list
        // NOTE: Updating this text is very awkward?
        document.getElementById('detail_session_'+value.id).getElementsByTagName('h2')[0].firstChild.data = value.name;
        console.log(document.getElementById('detail_session_'+value.id).getElementsByTagName('h2')[0]);
        document.getElementById('detail_session_'+value.id).getElementsByTagName('h2')[0].getElementsByTagName('span')[0].innerHTML = dateFns.format(session_startdatetime, 'ddd h:mm A');
      } else {
        // Add the new session to the launcher sessions list
        let div_node = document.createElement('DIV');
        div_node.id = 'detail_session_'+value.id;
        div_node.className = 'container d-none session_detail';
        div_node.setAttribute('data-session_id', value.id);
        
        let h2_node = document.createElement('H2');
        h2_node.className = 'session_title d-flex justify-content-between align-items-center';
        
        // NOTE: Instead of a text node should this just be wrapped in a set of tags?
        // Updating this is kind of awkward... see above
        let h2_text_node = document.createTextNode(value.name);
        h2_node.appendChild(h2_text_node);
        
        let h2_span_node = document.createElement('SPAN');
        h2_span_node.className = 'badge badge-pill badge-info';
        
        let h2_span_text_node = document.createTextNode(dateFns.format(session_startdatetime, 'ddd h:mm A'));
        h2_span_node.appendChild(h2_span_text_node);
        
        h2_node.appendChild(h2_span_node);
        
        div_node.appendChild(h2_node);
        
        document.getElementById('launcher_sessions').appendChild(div_node);
      }
      
    } else {
      console.log('Event session not it.');
    }
  }).then(function() {
    console.log('idb_to_ui: Iterate tbl_event_session complete')
    tbl_event_session_complete = true;
  }).then(function() {
    // Second: remove sessions from the launcher sessions menu and sessions list
    // This is basing the removal of sessions only on the menu list of sessions.
    // In theory this should be safe as long as nothing gets out sync...
    console.log('Looking for removed sessions...');
    
    let session_list_items = document.getElementById('sessions_menu').getElementsByTagName('ul')[0].childNodes;
    console.log(session_list_items);
    //console.log(session_list_items.length);
    
    for (var i in session_list_items) {
      console.log(session_list_items[i].getAttribute('data-session_id'));
      //console.log(session_list_items[i]);
      let session_id = session_list_items[i].getAttribute('data-session_id')
      let session_valid = false;
      
      tbl_event_session.iterate(function(value, key, iteration) {
        console.log(value.event_id+' ?= '+event_id+' : '+value.event_location_id+' ?= '+event_location_id+' : '+value.id+' ?= '+session_id);
        if (value.event_id == event_id && value.event_location_id == event_location_id && value.id == session_id) {
          // The session is still part of the event and the location
          session_valid = true;
        } else {
          // The session is no longer part of the event and or the location
          //console.log('Need to remove session id '+session_id);
        }
      }).then(function() {
        console.log('idb_to_ui: Iterate tbl_event_session looking for sessions to remove is complete')
        if (session_valid) {
          console.log('Keep session id '+session_id);
        } else {
          console.log('Remove session id '+session_id);
          //session_list_items[i].remove();
          document.getElementById('menu_event_session_'+session_id).remove(); // Remove the node from the launcher sessions menu list
          document.getElementById('detail_session_'+session_id).remove(); // Remove the node from the launcher sessions list
        }
      });
    }
  });
  
  // Third: re-index view session buttons
  // NOTE: Should this go in a .then() section?
  // NOTE: It might make even more sense to only have this done individually per add. Should also do a remove to keep things clean.
  //index_launcher_sessions('btn_view_session');
  index_launcher_sessions('btn_view_session');
  
}


exports.render_event_session_file_records = function (events) {
  console.log('Rendering event session file records...');
}


exports.render_event_presentation_records = function (events) {
  console.log('Rendering event presentation records...');
}


exports.render_event_presention_file_records = function (events) {
  console.log('Rendering event presentation file records...');
}


exports.render_event_presenter_records = function (events) {
  console.log('Rendering event presenter records...');
}


exports.render_event_presenter_file_records = function (events) {
  console.log('Rendering event presenter file records...');
}


/* Updated 2020-01-31 */
function index_launcher_sessions(class_name) {
  console.log('Indexing launcher sessions with class name: '+class_name);
  var class_elements = document.getElementsByClassName(class_name);
  
  
  for (var i = 0; i < class_elements.length; i++) {
    class_elements[i].addEventListener( 'click', function() {view_session( this.getAttribute('data-session_id')) } );
  }
  console.log(class_elements);
  return true;
}


/* Updated 2020-01-31 */
function view_session(session_id) {
  var class_elements = document.getElementsByClassName('session_detail'); // This class name should be the class names for each div container
  console.log('*** View session ID: '+session_id);
  for (var i = 0; i < class_elements.length; i++) {
    console.log('*** checking: '+class_elements[i].getAttribute('data-session_id'));
    if (class_elements[i].getAttribute('data-session_id') == session_id) {
      console.log('show');
      class_elements[i].classList.remove('d-none');
      class_elements[i].classList.add('d-block');
    } else {
      console.log('hide');
      class_elements[i].classList.remove('d-block');
      class_elements[i].classList.add('d-none');
    }
  }
  
  return true;
}


function format_bytes(bytes, decimals = 2) {
    if (bytes === 0) return '0 Bytes';

    const k = 1024;
    const dm = decimals < 0 ? 0 : decimals;
    const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];

    const i = Math.floor(Math.log(bytes) / Math.log(k));

    return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
}