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

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


exports.create_load_idb = async function create_load_idb() {
  
  return true;
}


exports.idb_to_launcher = async function idb_to_launcher() {
  if (idb_to_launcher_in_progress) {
    console.log('*** Exit idb_to_launcher. It is already in progress. ***');
    return false; // return false... false being that another idb_to_launcher is in progress
  } else {
    console.log('idb_to_launcher is not in progress. It appears to be safe to start... starting.');
  }
  
  //tbl_example.iterate(tbl_check, tbl_check_success, tbl_check_error); //tbl_check(value, key, iteration)
  let launcher_new = new Object();
  
  let tbl_event_complete = false;
  let tbl_event_file_complete = false;
  let tbl_event_location_complete = false;
  let tbl_event_location_file_complete = false;
  let tbl_event_session_complete = false;
  let tbl_event_session_file_complete = false;
  let tbl_event_presentation_complete = false;
  let tbl_event_presentation_file_complete = false;
  let tbl_event_presenter_complete = false;
  let tbl_event_presenter_file_complete = false;
  
  // Look for *events*
  let tmp_event = [];
  tbl_event.iterate(function(event_value, key, iteration) {
    tmp_event.push(event_value);
  }).then(function() {
    //console.log('idb_to_launcher: Iterate tbl_event complete')
    tbl_event_complete = true;
  });
  launcher_new.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_new.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_new.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')
    tbl_event_file_complete = true;
  });
  launcher_new.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);
  }).then(function() {
    //console.log('idb_to_launcher: Iterate tbl_event_location complete')
    tbl_event_location_complete = true;
  });
  launcher_new.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_new.location[0].id == file_value.for_id) {
      tmp_event_location_file.push(file_value);
    }
  }).then(function() {
    //console.log('idb_to_launcher: Iterate tbl_event_file complete')
    tbl_event_location_file_complete = true;
  });
  launcher_new.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)
      }
    }).then(function() {
      //console.log('idb_to_launcher: Iterate tbl_event_file complete')
      tbl_event_session_file_complete = true;
    });
    
    
    // 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);
          }
        }).then(function() {
          //console.log('idb_to_launcher: Iterate tbl_event_file complete')
          tbl_event_presentation_file_complete = true;
        });
        
        
        // 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);
              }
            }).then(function() {
              //console.log('idb_to_launcher: Iterate tbl_event_file complete')
              tbl_event_presenter_file_complete = true;
            });
            presentation_value.presenter.push(presenter_value);
          }
        }).then(function() {
          //console.log('idb_to_launcher: Iterate tbl_event_presenter complete')
          tbl_event_presenter_complete = true;
        });
        
        session_value.presentation.push(presentation_value);
      }//);
      
    }).then(function() {
      //console.log('idb_to_launcher: Iterate tbl_event_presentation complete')
      tbl_event_presentation_complete = true;
    });
    //});
    
    tmp_event_session.push(session_value);
    
  }).then(function() {
    //console.log('idb_to_launcher: Iterate tbl_event_session complete')
    tbl_event_session_complete = true;
  });
  launcher_new.session = tmp_event_session;
  
  /*
  console.log('v2 idb to launcher object: ***');
  console.log(launcher);
  console.log('v2 idb to launcher object: ^^^');
  */
  
  var creating_launcher_object_loop = setInterval(function() {
    if (tbl_event_complete && tbl_event_file_complete && tbl_event_location_complete && tbl_event_location_file_complete && tbl_event_session_complete && tbl_event_session_file_complete && tbl_event_presentation_complete && tbl_event_presentation_file_complete && tbl_event_presenter_complete && tbl_event_presenter_file_complete) {
      console.log('*** New launcher object built!!! ***');
      console.log('idb to launcher object: ***');
      console.log(launcher_new);
      console.log('idb to launcher object: ^^^');
      launcher = launcher_new;
      safe_to_render_launcher = true;
      idb_to_launcher_in_progress = false;
      //ui.render_launcher(launcher_new);
      clearInterval(creating_launcher_object_loop);
      return launcher_new;
    } else {
      console.log('Still building launcher object...');
      safe_to_render_launcher = false;
      idb_to_launcher_in_progress = true;
    }
  }, 5);
  //return launcher_new;
}

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.
      }
    }
  });
  
  return true;
}


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);
}