const os = require('os');
const path = require('path');
const fs = require('fs');

const { ipcRenderer } = require('electron');


exports.launcher_cache_check = async function (launcher, api_base_url, api_temporary_token, host_file_cache_path) {
  if (typeof launcher.event === 'undefined') {
    launcher.event = await api.get_event_details(axios, launcher.event_id);
    tbl_event.setItem(launcher.event.id.toString(), launcher.event);
    /*
    .then(function (data) {
      console.log(data.id);
      idbKeyval.set(data.id, data, tbl_event);
      //for (var i in response) {
        //var event_record = data[i];
        //idbKeyval.set(response[i].id, response[i], tbl_event);
      //}
    });
    */
    
  }
  
  if (typeof launcher.location === 'undefined') {
    launcher.location = await api.get_event_location_details(axios, launcher.event_id, launcher.event_location_id);
    tbl_event_location.setItem(launcher.location.id.toString(), launcher.location);
  }
  
  if (typeof launcher.event_files === 'undefined') {
    console.log('Check for global event files.');
    let for_id = launcher.event_id;
    launcher.event_files = await api.get_files_for_type_for_id(axios, 'event', for_id);
    for (var i in launcher.event_files) {
      console.log('f: ('+launcher.event_files[i].event_file_id+') '+launcher.event_files[i].event_file_filename+' ***')
      tbl_event_file.setItem(launcher.event_files[i].event_file_id.toString(), launcher.event_files[i]);
      
      file_id = launcher.event_files[i].event_file_id; // NOTE: the .id is the hosted_file.id!
      let filename = launcher.event_files[i].hash_sha256+'.file';
      
      save_path = path.join(host_file_cache_path, filename);
      
      if (fs.existsSync(save_path)) {
        console.log('Local file already exists: '+save_path);
      } else {
        console.log('File not found locally. Downloading file: '+save_path);
        let api_endpoint = '/event/file/'+file_id+'/download';
        ipcRenderer.send('download_file', api_base_url, api_endpoint, api_temporary_token, save_path); // Must download file using main node.js thread.
      }
    }
  } else {
    console.log('No check for global event files');
  }
  
  
  if (typeof launcher.location_files === 'undefined') {
    console.log('Check for location specific files.');
    let for_id = launcher.event_location_id;
    launcher.location_files = await api.get_files_for_type_for_id(axios, 'location', for_id);
    for (var i in launcher.location_files) {
      console.log('f: ('+launcher.location_files[i].event_file_id+') '+launcher.location_files[i].event_file_filename+' ***')
      tbl_event_file.setItem(launcher.location_files[i].event_file_id.toString(), launcher.location_files[i]);
      
      file_id = launcher.location_files[i].event_file_id; // NOTE: the .id is the hosted_file.id!
      let filename = launcher.location_files[i].hash_sha256+'.file';
      
      save_path = path.join(host_file_cache_path, filename);
      
      if (fs.existsSync(save_path)) {
        console.log('Local file already exists: '+save_path);
      } else {
        console.log('File not found locally. Downloading file: '+save_path);
        let api_endpoint = '/event/file/'+file_id+'/download';
        ipcRenderer.send('download_file', api_base_url, api_endpoint, api_temporary_token, save_path); // Must download file using main node.js thread.
      }
    }
  } else {
    console.log('No check for location specific files.');
  }
  
  
  if (typeof launcher.sessions === 'undefined') {
    console.log('Check for location sessions.');
    launcher.sessions = await api.get_event_location_sessions(axios, launcher.event_id, launcher.event_location_id);
    for (var i in launcher.sessions) {
      console.log('*** '+launcher.sessions[i].name+' ***')
      tbl_event_session.setItem(launcher.sessions[i].id.toString(), launcher.sessions[i]);
      
      // Check for session files start
      if (typeof launcher.sessions[i].files === 'undefined') {
        console.log('Check for session files.');
        let for_id = launcher.sessions[i].id;
        launcher.sessions[i].files = await api.get_files_for_type_for_id(axios, 'session', for_id);
        if (launcher.sessions[i].files) {
          console.log('Session files found.');
          for (var j in launcher.sessions[i].files) {
            console.log('f: ('+launcher.sessions[i].files[j].event_file_id+') '+launcher.sessions[i].files[j].event_file_filename+' ***');
            tbl_event_file.setItem(launcher.sessions[i].files[j].event_file_id.toString(), launcher.sessions[i].files[j]);
            
            file_id = launcher.sessions[i].files[j].event_file_id; // NOTE: the .id is the hosted_file.id!
            let filename = launcher.sessions[i].files[j].hash_sha256+'.file';
            
            save_path = path.join(host_file_cache_path, filename);
            
            if (fs.existsSync(save_path)) {
              console.log('Local file already exists: '+save_path);
            } else {
              console.log('File not found locally. Downloading file: '+save_path);
              let api_endpoint = '/event/file/'+file_id+'/download';
              ipcRenderer.send('download_file', api_base_url, api_endpoint, api_temporary_token, save_path); // Must download file using main node.js thread.
            }
          }
        } else {
          console.log('No session files found.');
        }
      } else {
        console.log('No check for session files.');
      }
      // Check for session files end
      
      // Get session presentations and associated files
      launcher.sessions[i].presentations = await api.get_session_presentations(axios, launcher.event_id, launcher.sessions[i].id);
      for (var j in launcher.sessions[i].presentations) {
        console.log('* '+launcher.sessions[i].presentations[j].name);
        tbl_event_presentation.setItem(launcher.sessions[i].presentations[j].id.toString(), launcher.sessions[i].presentations[j]);
        
        // Check for presentation files start
        if (typeof launcher.sessions[i].presentations[j].files === 'undefined') {
          console.log('Check for presentation files.');
          let for_id = launcher.sessions[i].presentations[j].id;
          launcher.sessions[i].presentations[j].files = await api.get_files_for_type_for_id(axios, 'presentation', for_id);
          if (launcher.sessions[i].presentations[j].files) {
            console.log('Presentation files found.');
            for (var k in launcher.sessions[i].presentations[j].files) {
              console.log('f: ('+launcher.sessions[i].presentations[j].files[k].event_file_id+') '+launcher.sessions[i].presentations[j].files[k].event_file_filename+' ***');
              tbl_event_file.setItem(launcher.sessions[i].presentations[j].files[k].event_file_id.toString(), launcher.sessions[i].presentations[j].files[k]);
              
              file_id = launcher.sessions[i].presentations[j].files[k].event_file_id; // NOTE: the .id is the hosted_file.id!
              let filename = launcher.sessions[i].presentations[j].files[k].hash_sha256+'.file';
              
              save_path = path.join(host_file_cache_path, filename);
              
              if (fs.existsSync(save_path)) {
                console.log('Local file already exists: '+save_path);
              } else {
                console.log('File not found locally. Downloading file: '+save_path);
                let api_endpoint = '/event/file/'+file_id+'/download';
                ipcRenderer.send('download_file', api_base_url, api_endpoint, api_temporary_token, save_path); // Must download file using main node.js thread.
              }
            }
          } else {
            console.log('No presentation files found.');
          }
        } else {
          console.log('No check for presentation files.');
        }
        // Check for presentation files end
        
        
        // Get session presentations presenters and associated files
        //let event_presentation_id = launcher.sessions[i].presentations[j].id;
        launcher.sessions[i].presentations[j].presenters = await api.get_presentation_presenters(axios, launcher.event_id, launcher.sessions[i].id, launcher.sessions[i].presentations[j].id);
        for (var k in launcher.sessions[i].presentations[j].presenters) {
          console.log('-- '+launcher.sessions[i].presentations[j].presenters[k].given_name+' '+launcher.sessions[i].presentations[j].presenters[k].family_name)
          tbl_event_presenter.setItem(launcher.sessions[i].presentations[j].presenters[k].id.toString(), launcher.sessions[i].presentations[j].presenters[k]);
          
          // Check for presenter files start
          if (typeof launcher.sessions[i].presentations[j].presenters[k].files === 'undefined') {
            console.log('Check for presenter files.');
            let for_id = launcher.sessions[i].presentations[j].presenters[k].id;
            launcher.sessions[i].presentations[j].presenters[k].files = await api.get_files_for_type_for_id(axios, 'presenter', for_id);
            if (launcher.sessions[i].presentations[j].presenters[k].files) {
              console.log('Presenter files found.');
              for (var l in launcher.sessions[i].presentations[j].presenters[k].files) {
                console.log('f: ('+launcher.sessions[i].presentations[j].presenters[k].files[l].event_file_id+') '+launcher.sessions[i].presentations[j].presenters[k].files[l].event_file_filename+' ***');
                tbl_event_file.setItem(launcher.sessions[i].presentations[j].presenters[k].files[l].event_file_id.toString(), launcher.sessions[i].presentations[j].presenters[k].files[l]);
                
                file_id = launcher.sessions[i].presentations[j].presenters[k].files[l].event_file_id; // NOTE: the .id is the hosted_file.id!
                let filename = launcher.sessions[i].presentations[j].presenters[k].files[l].hash_sha256+'.file';
                
                save_path = path.join(host_file_cache_path, filename);
                
                if (fs.existsSync(save_path)) {
                  console.log('Local file already exists: '+save_path);
                } else {
                  console.log('File not found locally. Downloading file: '+save_path);
                  let api_endpoint = '/event/file/'+file_id+'/download';
                  ipcRenderer.send('download_file', api_base_url, api_endpoint, api_temporary_token, save_path); // Must download file using main node.js thread.
                }
              }
            } else {
              console.log('No presenter files found.');
            }
          } else {
            console.log('No check for presenter files.');
          }
          // Check for presenter files end
          
        }
      }
    }
  } else {
    console.log('No check for location sessions.');
  }
  
  console.log('Location cache check finished.');
  return true;
}




/* Updated 2019-12-19 */
function index_location_detail(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')) } );
  }
  
  return true;
}


/* Updated 2019-12-19 */
function view_session(session_id) {
  var class_elements = document.getElementsByClassName('session_detail');
  console.log('*** 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;
}





/* Updated 2019-12-20 */
function index_open_file_buttons(class_name) {
  var class_elements = document.getElementsByClassName(class_name);
  
  for (var i = 0; i < class_elements.length; i++) {
    //class_elements[i].addEventListener( 'click', function() {open_local_file( this.getAttribute('data-filename')) } );
    
    //let directory = 'file_cache/';
    
    //directory_and_filename = path.join(directory, class_elements[i].getAttribute('data-filename'));
    
    let file_path = path.join(host_file_cache_path, class_elements[i].getAttribute('data-hash_sha256'));
    let filename = class_elements[i].getAttribute('data-filename');
    
    class_elements[i].addEventListener( 'click', function() { ipcRenderer.send('open_local_file', file_path, filename) } );
    //ipcRenderer.send('open_local_file', this.getAttribute('data-filename')); // in render thread
  }
  
  return true;
}