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

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

exports.api_token_request_async = async function (axios, secret_key) {
  console.log('Requesting API temporary token...');
  const url = '/api_token_request';
  
  let data = { secret_key: secret_key };
  
  const response = await axios.post(url, data)
    .then(function (response) {
      //console.log(response);
      const api_temporary_token = response.data.temporary_token;
      //console.log('API Temporary Token: '+temporary_token);
      return api_temporary_token;
    })
    .catch(function (error) {
      console.error(error);
      return error;
    });
  return response;
}


exports.get_event_location_sessions = async function (axios, event_id, event_location_id) {
  console.log('Requesting location sessions...');
  const url = '/event/'+event_id+'/location/'+event_location_id+'/session';
  
  const data = await axios.get(url)
    .then(function (response) {
      //console.log(response.data);
      //data = response.data;
      return response.data;
    })
    .catch(function (error) {
      console.log(error);
      return error;
    });
  
  return data;
}


exports.get_session_presentations = async function (axios, event_id, event_session_id) {
  console.log('Requesting session presentations...');
  const url = '/event/'+event_id+'/session/'+event_session_id+'/presentation';
  
  const data = await axios.get(url)
    .then(function (response) {
      //console.log(response.data);
      //data = response.data;
      return response.data;
    })
    .catch(function (error) {
      console.log(error);
      return error;
    });
  
  return data;
}


exports.get_presentation_presenters = async function (axios, event_id, event_session_id, event_presentation_id) {
  console.log('Requesting presentation presenters...');
  const url = '/event/'+event_id+'/session/'+event_session_id+'/presentation/'+event_presentation_id+'/presenter';
  
  const data = await axios.get(url)
    .then(function (response) {
      //console.log(response.data);
      //data = response.data;
      return response.data;
    })
    .catch(function (error) {
      console.log(error);
      return error;
    });
  
  return data;
}


exports.get_files_for_type_for_id = async function (axios, for_type, for_id) {
  console.log('Requesting files...');
  const url = '/event/file/'+for_type+'/'+for_id;
  
  const data = await axios.get(url)
    .then(function (response) {
      //console.log(response.data);
      //data = response.data;
      return response.data;
    })
    .catch(function (error) {
      console.log(error);
      return error;
    });
  
  return data;
}


exports.download_file_id = async function (axios, file_id, filename) {
  
  ipcRenderer.send('download_file', api_base_url, api_endpoint, api_temporary_token, save_path); // in render thread
  
  console.log('1: download file id '+file_id);
  const url = '/event/file/'+file_id+'/download';
  
  //const data = await axios.get(url, responseType: 'stream')
  const data = await axios({
    method: "get",
    url: url,
    responseType: "stream"
  })
    .then(function (response) {
      console.log('2: downloaded file id '+file_id);
      console.log(response);
      //console.log(response.data);
      
      let filename = 'default.txt';
      
      if (typeof filename_override === 'undefined' || filename_override == null) {
        let headerLine = response.data.headers['content-disposition'];
        
        console.log(headerLine);
        console.log(headerLine.indexOf('="'));
        console.log(headerLine.indexOf('='));
        if (headerLine.indexOf('="') != -1) {
          let startFileNameIndex = headerLine.indexOf('="') + 2;
          let endFileNameIndex = headerLine.lastIndexOf('"');
          filename = headerLine.substring(startFileNameIndex, endFileNameIndex);
        } else if (headerLine.indexOf('=') != -1) {
          let startFileNameIndex = headerLine.indexOf('=') + 1;
          let endFileNameIndex = headerLine.length;
          filename = headerLine.substring(startFileNameIndex, endFileNameIndex);
        } else {
          filename = 'filename_not_found_in_header.txt';
        }
      } else {
        filename = filename_override;
      }

      let directory = 'file_cache/';
      
      directory_and_filename = path.join(directory, filename);
      
      //console.log(directory_and_filename);
      
      if (fs.existsSync(directory_and_filename)) {
        console.log('3a: file already exists: '+directory_and_filename);
      } else {
        console.log('3b: saving file: '+directory_and_filename);
        response.data.pipe(fs.createWriteStream(directory_and_filename));
      }
      //data = response.data;
      console.log('4: saved file id '+file_id);
      return true;
      //return response.data;
    })
    .catch(function (error) {
      console.log(error);
      return error;
    });
  
  //return data;
}

exports.launcher_cache = async function (launcher, api_base_url, api_endpoint, api_temporary_token, file_cache_path) {
  if (typeof launcher.sessions === 'undefined') {
    console.log('Check for location files.');
    let for_id = launcher.event_location_id;
    launcher.files = await api.get_files_for_type_for_id(axios, 'location', for_id);
    for (var i in launcher.files) {
      console.log('f: ('+launcher.files[i].event_file_id+') '+launcher.files[i].event_file_filename+' ***')
      file_id = launcher.files[i].event_file_id; // NOTE: the .id is the hosted_file.id!
      let filename = launcher.files[i].hash_sha256+'.file';
      
      save_path = path.join(file_cache_path, filename);
      
      //console.log(directory_and_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);
        const 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.
        //response.data.pipe(fs.createWriteStream(directory_and_filename));
      }
      //let results = await api.download_file_id(axios, file_id, hash_sha256);
      
    }
  } else {
    console.log('No check for location 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+' ***')
      
      // 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+' ***');
            file_id = launcher.sessions[i].files[j].event_file_id; // NOTE: the .id is the hosted_file.id!
            hash_sha256 = launcher.sessions[i].files[j].hash_sha256+'.file';
            let results = await api.download_file_id(axios, file_id, hash_sha256);
          }
        } 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);
        
        // 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+' ***');
              file_id = launcher.sessions[i].presentations[j].files[k].event_file_id; // NOTE: the .id is the hosted_file.id!
              hash_sha256 = launcher.sessions[i].presentations[j].files[k].hash_sha256+'.file';
              let results = await api.download_file_id(axios, file_id, hash_sha256);
            }
          } 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)
          
          // 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+' ***')
                file_id = launcher.sessions[i].presentations[j].presenters[k].files[l].event_file_id; // NOTE: the .id is the hosted_file.id!
                hash_sha256 = launcher.sessions[i].presentations[j].presenters[k].files[l].hash_sha256+'.file';
                let results = await api.download_file_id(axios, file_id, hash_sha256);
              }
            } 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.');
  }
  /*
  if (launcher.sessions) {
    console.log('Check for session files.');
    let for_id = launcher.event_location_id;
    launcher.files = await api.get_files_for_type_for_id(axios, 'location', for_id);
    for (var i in launcher.sessions) {
      console.log('f: ('+launcher.sessions[i].event_file_id+') '+launcher.files[i].event_file_filename+' ***')
      file_id = launcher.files[i].event_file_id; // NOTE: the .id is the hosted_file.id!
      let results = await api.download_file_id(axios, file_id);
    }
  } else {
    console.log('No check for location files.');
  }
  */
}