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;
}


exports.idb_to_launcher = async function idb_to_launcher() {
  //tbl_example.iterate(tbl_check, tbl_check_success, tbl_check_error); //tbl_check(value, key, iteration)
  //let launcher = new Object();
  
  // Look for *events*
  let tmp_event = [];
  tbl_event.iterate(function(event_value, key, iteration) {
    tmp_event.push(event_value);
  });
  launcher.event = tmp_event;
  
  // Look for *event files*
  let tmp_event_file = []
  tbl_event_file.iterate(function(file_value, key, iteration) {
    //console.log('event id: '+launcher.event[0].id+' -> file_id: '+file_value.id+'for type: '+file_value.for_type+' for id: '+file_value.id);
    if (file_value.for_type == 'event' && launcher.event[0].id == file_value.for_id) {
      tmp_event_file.push(file_value);
    }
  }).then(function() {
    console.log('idb_to_launcher: Iterate tbl_event_file complete')
  });
  launcher.event_file = tmp_event_file;
  
  
  // Look for *locations*
  let tmp_event_location = []
  tbl_event_location.iterate(function(location_value, key, iteration) {
    tmp_event_location.push(location_value);
  });
  launcher.location = tmp_event_location;
  
  // Look for *event location files*
  let tmp_event_location_file = []
  tbl_event_file.iterate(function(file_value, key, iteration) {
    if (file_value.for_type == 'location' && launcher.location[0].id == file_value.for_id) {
      tmp_event_location_file.push(file_value);
    }
  });
  launcher.location_file = tmp_event_location_file;
  
  
  // Look for *sessions*
  let tmp_event_session = []
  tbl_event_session.iterate(function(session_value, session_key, session_iteration) {
    //console.log('session id: '+session_value.id);
    
    
    // Look for *session files*
    session_value.file = [];
    tbl_event_file.iterate(function(session_file_value, session_file_key, session_file_iteration) {
      if (session_file_value.for_type == 'session' && session_value.id == session_file_value.for_id) {
        //console.log('session id: '+session_value.id+' -> file id: '+session_file_value.id);
        session_value.file.push(session_file_value)
        //tmp_event_session_file.push(session_file_value);
      }
    });
    
    
    // Look for *presentations per session*
    session_value.presentation = [];
    tbl_event_presentation.iterate(function(presentation_value, presentation_key, presentation_iteration) {
      if (session_value.id == presentation_value.event_session_id) {
        //console.log('session id: '+session_value.id+' -> presentation id: '+presentation_value.id);
        
        
        // Look for *presentation files*
        presentation_value.file = [];
        tbl_event_file.iterate(function(presentation_file_value, presentation_file_key, presentation_file_iteration) {
          if (presentation_file_value.for_type == 'presentation' && presentation_value.id == presentation_file_value.for_id) {
            presentation_value.file.push(presentation_file_value);
          }
        });
        
        
        // Look for *presenters per presentation*
        presentation_value.presenter = [];
        tbl_event_presenter.iterate(function(presenter_value, presenter_key, presenter_iteration) {
          if (presentation_value.id == presenter_value.event_presentation_id) {
            //console.log('presentation id: '+presentation_value.id+' -> presenter id: '+presenter_value.id);
            
            // Look for *presenter files*
            presenter_value.file = [];
            tbl_event_file.iterate(function(presenter_file_value, presenter_file_key, presenter_file_iteration) {
              if (presenter_file_value.for_type == 'presenter' && presenter_value.id == presenter_file_value.for_id) {
                presenter_value.file.push(presenter_file_value);
              }
            });
            
            
            //NOTE for some reason this is adding duplicate presenters to a session
            //NOTE is this iterating twice or something???
            /*
            tbl_event_file.iterate(function(presenter_file_value, key, iteration) {
            
            });
            */
            presentation_value.presenter.push(presenter_value);
          }
        });
        
        //NOTE add in presenters and then presenter's files
          
          
        session_value.presentation.push(presentation_value);
      }//);
      
    });
    //});
    
    tmp_event_session.push(session_value);
    
  }).then(function() {
    console.log('idb_to_launcher: Iterate tbl_event_session complete')
  });
  launcher.session = tmp_event_session;
  
  /*
  console.log('v2 idb to launcher object: ***');
  console.log(launcher);
  console.log('v2 idb to launcher object: ^^^');
  */
  
  return true;
}

exports.check_file_cache = async function () {
  console.log('Checking the local file cache against the remote server.');
  tbl_event_file.iterate(function(file_value, key, iteration) {
    if (file_value.event_location_id == event_location_id) {
      console.log('f: ('+file_value.event_file_id+') '+file_value.event_file_filename+' ***')
      
      file_id = file_value.event_file_id; // NOTE: the .id is the hosted_file.id!
      let filename = file_value.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.
      }
    }
  });
}


function tbl_check(value, key, iteration) {
  console.log(value);
}

function tbl_check_success(result) {
  console.log(result);
}
function tbl_check_error(result) {
  console.log(result);
}