class AppClient {
  constructor(currentUserId) {
    this.socket = io({transports: ['websocket']});
    this.users = {};
    this.users.self = this.loadUser(currentUserId);
  }

  loadUser(userId) {
    let user = new User();
    this.users[userId] = user;
    this.socket.on(`user_${userId}_init`, msg => user.init(JSON.parse(msg)));
    this.socket.on(`user_${userId}_patch`, msg => user.patch(JSON.parse(msg)));
    this.socket.emit('start_user_session', userId);
    return user;
  }
}


class User {
  constructor() {
    this.data = undefined;
    this.eventListeners = {
      corporaInit: [],
      corporaPatch: [],
      jobsInit: [],
      jobsPatch: [],
      queryResultsInit: [],
      queryResultsPatch: []
    };
  }

  init(data) {
    this.data = data;

    let listener;
    for (listener of this.eventListeners.corporaInit) {
      listener(this.data.corpora);
    }
    for (listener of this.eventListeners.jobsInit) {
      listener(this.data.jobs);
    }
    for (listener of this.eventListeners.queryResultsInit) {
      listener(this.data.query_results);
    }
  }

  patch(patch) {
    this.data = jsonpatch.apply_patch(this.data, patch);

    let corporaPatch = patch.filter(operation => operation.path.startsWith("/corpora"));
    let jobsPatch = patch.filter(operation => operation.path.startsWith("/jobs"));
    let queryResultsPatch = patch.filter(operation => operation.path.startsWith("/query_results"));

    for (let listener of this.eventListeners.corporaPatch) {
      if (corporaPatch.length > 0) {listener(corporaPatch);}
    }
    for (let listener of this.eventListeners.jobsPatch) {
      if (jobsPatch.length > 0) {listener(jobsPatch);}
    }
    for (let listener of this.eventListeners.queryResultsPatch) {
      if (queryResultsPatch.length > 0) {listener(queryResultsPatch);}
    }

    for (let operation of jobsPatch) {
      if (operation.op !== 'replace') {continue;}
      // Matches the only path that should be handled here: /jobs/{jobId}/status
      if (/^\/jobs\/(\d+)\/status$/.test(operation.path)) {
        let [match, jobId] = operation.path.match(/^\/jobs\/(\d+)\/status$/);
        if (this.data.settings.job_status_site_notifications === "end" && !["complete", "failed"].includes(operation.value)) {continue;}
        nopaque.flash(`[<a href="/jobs/${jobId}">${this.data.jobs[jobId].title}</a>] New status: ${operation.value}`, "job");
      }
    }
  }

  addEventListener(type, listener) {
    switch (type) {
      case 'corporaInit':
        this.eventListeners.corporaInit.push(listener);
        if (this.data !== undefined) {listener(this.data.corpora);}
        break;
      case 'corporaPatch':
        this.eventListeners.corporaPatch.push(listener);
        break;
      case 'jobsInit':
        this.eventListeners.jobsInit.push(listener);
        if (this.data !== undefined) {listener(this.data.jobs);}
        break;
      case 'jobsPatch':
        this.eventListeners.jobsPatch.push(listener);
        break;
      case 'queryResultsInit':
        this.eventListeners.queryResultsInit.push(listener);
        if (this.data !== undefined) {listener(this.data.query_results);}
        break;
      case 'queryResultsPatch':
        this.eventListeners.queryResultsPatch.push(listener);
        break;
      default:
        console.error(`Unknown event type: ${type}`);
    }
  }
}


/*
 * The nopaque object is used as a namespace for nopaque specific functions and
 * variables.
 */
var nopaque = {};

nopaque.flash = function(message, category) {
  let toast;
  let toastActionElement;

  switch (category) {
    case "corpus":
      message = `<i class="left material-icons">book</i>${message}`;
      break;
    case "error":
      message = `<i class="left material-icons red-text">error</i>${message}`;
      break;
    case "job":
      message = `<i class="left material-icons">work</i>${message}`;
      break;
    default:
      message = `<i class="left material-icons">notifications</i>${message}`;
  }

  toast = M.toast({html: `<span>${message}</span>
                          <button data-action="close" class="btn-flat toast-action white-text">
                            <i class="material-icons">close</i>
                          </button>`});
  toastActionElement = toast.el.querySelector('.toast-action[data-action="close"]');
  toastActionElement.addEventListener('click', () => {toast.dismiss();});
};

nopaque.Forms = {};
nopaque.Forms.init = function() {
  var abortRequestElement, parentElement, progressElement, progressModal,
      progressModalElement, request, submitElement;

  for (let form of document.querySelectorAll(".nopaque-submit-form")) {
    submitElement = form.querySelector('button[type="submit"]');
    submitElement.addEventListener("click", function() {
      for (let selectElement of form.querySelectorAll('select')) {
        if (selectElement.value === "") {
          parentElement = selectElement.closest(".input-field");
          parentElement.querySelector(".select-dropdown").classList.add("invalid");
          for (let helperTextElement of parentElement.querySelectorAll(".helper-text")) {
            helperTextElement.remove();
          }
          parentElement.insertAdjacentHTML("beforeend", `<span class="helper-text red-text">Please select an option.</span>`);
        }
      }
    });

    request = new XMLHttpRequest();
    if (form.dataset.hasOwnProperty("progressModal")) {
      progressModalElement = document.getElementById(form.dataset.progressModal);
      progressModal = M.Modal.getInstance(progressModalElement);
      progressModal.options.dismissible = false;
      abortRequestElement = progressModalElement.querySelector(".abort-request");
      abortRequestElement.addEventListener("click", function() {request.abort();});
      progressElement = progressModalElement.querySelector(".determinate");
    }
    form.addEventListener("submit", function(event) {
      event.preventDefault();
      var formData;

      formData = new FormData(form);
      // Initialize progress modal
      if (progressModalElement) {
        progressElement.style.width = "0%";
        progressModal.open();
      }
      request.open("POST", window.location.href);
      request.send(formData);
    });
    request.addEventListener("load", function(event) {
      var fieldElement;

      if (request.status === 201) {
        window.location.href = JSON.parse(this.responseText).redirect_url;
      }
      if (request.status === 400) {
        console.log(request);
        for (let [field, errors] of Object.entries(JSON.parse(this.responseText))) {
          fieldElement = form.querySelector(`input[name$="${field}"]`).closest(".input-field");
          for (let error of errors) {
            fieldElement.insertAdjacentHTML("beforeend", `<span class="helper-text red-text">${error}</span>`);
          }
        }
        if (progressModalElement) {
          progressModal.close();
        }
      }
      if (request.status === 500) {
        location.reload();
      }
    });
    if (progressModalElement) {
      request.upload.addEventListener("progress", function(event) {
        progressElement.style.width = Math.floor(100 * event.loaded / event.total).toString() + "%";
      });
    }
  }
}