import { LitElement, html, css } from "lit";
import { wrapCss } from "./misc";

import prettyBytes from "pretty-bytes";

import { parseURLSchemeHostPath } from "./pageutils";

// ===========================================================================
class Loader extends LitElement {
  constructor() {
    super();
    this.progress = 0;
    this.total = 0;
    this.percent = 0;
    this.coll = "";
    this.state = "waiting";
    this.loadInfo = null;

    this.currentSize = 0;
    this.totalSize = 0;

    this.tryFileHandle = !!window.showOpenFilePicker;

    this.fileHandle = null;

    this.errorAllowRetry = false;

    this.pingInterval = 0;

    this.noWebWorker = false;
  }

  static get properties() {
    return {
      sourceUrl: { type: String },
      loadInfo: { type: Object },
      state: { type: String },
      progress: { type: Number },
      percent: { type: Number },
      currentSize: { type: Number },
      totalSize: { type: Number },
      error: { type: String },
      total: { type: Number },
      status: { type: String },
      coll: { type: String },
      embed: { type: String },
      tryFileHandle: { type: Boolean },
      errorAllowRetry: { type: Boolean },
      extraMsg: { type: String },
      swName: { type: String },
    };
  }

  firstUpdated() {
    this.initMessages();
    //this.doLoad();
  }

  initMessages() {
    this.noWebWorker = this.loadInfo && this.loadInfo.noWebWorker;

    if (!this.noWebWorker) {
      // eslint-disable-next-line no-undef
      this.worker = new Worker(this.swName);
    } else {
      if (!navigator.serviceWorker) {
        return;
      }

      this.worker = navigator.serviceWorker;
    }

    this.worker.addEventListener("message", (event) => {
      switch (event.data.msg_type) {
        case "collProgress":
          if (event.data.name === this.coll) {
            this.percent = event.data.percent;
            if (event.data.error) {
              this.error = event.data.error;
              this.state = "errored";
              this.errorAllowRetry = true;
              this.fileHandle = event.data.fileHandle;
              if (this.error === "missing_local_file") {
                this.tryFileHandle = false;
              } else if (
                this.error === "permission_needed" &&
                event.data.fileHandle
              ) {
                this.state = "permission_needed";
                break;
              }
            }
            if (event.data.currentSize && event.data.totalSize) {
              this.currentSize = event.data.currentSize;
              this.totalSize = event.data.totalSize;
            }
            this.extraMsg = event.data.extraMsg;
          }
          break;

        case "collAdded":
          if (event.data.name === this.coll) {
            if (!this.total) {
              this.total = 100;
            }
            this.progress = this.total;
            this.percent = 100;
            this.dispatchEvent(
              new CustomEvent("coll-loaded", { detail: event.data }),
            );

            if (!this.noWebWorker) {
              this.worker.terminate();
            } else {
              if (this.pingInterval) {
                clearInterval(this.pingInterval);
              }
            }
            this.worker = null;
          }
          break;
      }
    });
  }

  async doLoad() {
    let sourceUrl = this.sourceUrl;
    let source = null;

    this.percent = this.currentSize = this.totalSize = 0;

    // const noSWError = getSWErrorMsg();

    if (this.loadInfo && this.loadInfo.swError) {
      this.state = "errored";
      this.error = this.loadInfo.swError;
      this.errorAllowRetry = false;
      return;
    }

    // custom protocol handlers here...
    try {
      const { scheme, host, path } = parseURLSchemeHostPath(sourceUrl);

      switch (scheme) {
        case "googledrive":
          this.state = "googledrive";
          source = await this.googledriveInit();
          break;

        case "s3":
          source = {
            sourceUrl,
            loadUrl: `https://${host}.s3.amazonaws.com${path}`,
            name: this.sourceUrl,
          };
          break;

        case "file":
          if (!this.loadInfo && !this.tryFileHandle) {
            this.state = "errored";
            this.error = `\
File URLs can not be entered directly or shared.
You can select a file to upload from the main page by clicking the 'Choose File...' button.`;
            this.errorAllowRetry = false;
            return;
          }

          source = this.loadInfo;
          break;

        case "proxy":
          sourceUrl = "proxy:" + sourceUrl.slice("proxy://".length);
          break;
      }
    } catch (e) {
      console.log(e);
    }

    if (!source) {
      source = { sourceUrl };
    }

    this.state = "started";

    let type = undefined;
    let extraConfig = undefined;

    if (this.loadInfo) {
      source.newFullImport = this.loadInfo.newFullImport;
      source.loadEager = this.loadInfo.loadEager;
      source.noCache = this.loadInfo.noCache;

      if (this.loadInfo.extraConfig) {
        extraConfig = this.loadInfo.extraConfig;
      }
      // todo: too special case?
      if (
        sourceUrl.startsWith("proxy:") &&
        extraConfig &&
        extraConfig.recording
      ) {
        type = "recordingproxy";
      }
    }

    const msg = {
      msg_type: "addColl",
      name: this.coll,
      extraConfig,
      type,
      skipExisting: true,
      file: source,
    };

    if (!navigator.serviceWorker.controller) {
      await new Promise((resolve) => {
        navigator.serviceWorker.addEventListener("controllerchange", () =>
          resolve(),
        );
      });
    }

    if (this.worker) {
      if (!this.noWebWorker) {
        this.worker.postMessage(msg);
      } else {
        navigator.serviceWorker.controller.postMessage(msg);

        // ping service worker with messages to avoid shutdown while loading
        // (mostly for Firefox)
        this.pingInterval = setInterval(() => {
          navigator.serviceWorker.controller.postMessage({ msg_type: "ping" });
        }, 15000);
      }
    }
  }

  googledriveInit() {
    this._gdWait = new Promise((resolve) => (this._gdResolve = resolve));
    return this._gdWait;
  }

  async onLoadReady(event) {
    if (this._gdResolve) {
      //const digest = await digestMessage(url, 'SHA-256');
      //this.coll = "id-" + digest.slice(0, 12);

      this._gdResolve(event.detail);
    }
  }

  onCancel() {
    if (!this.worker) {
      return;
    }

    const msg = { msg_type: "cancelLoad", name: this.coll };

    if (!this.noWebWorker) {
      this.worker.postMessage(msg);
      return;
    }

    if (navigator.serviceWorker && navigator.serviceWorker.controller) {
      navigator.serviceWorker.controller.postMessage(msg);
      if (this.pingInterval) {
        clearInterval(this.pingInterval);
      }
    }
  }

  updated(changedProperties) {
    if (
      (this.sourceUrl && changedProperties.has("sourceUrl")) ||
      changedProperties.has("tryFileHandle")
    ) {
      this.doLoad();
    }
  }

  static get styles() {
    return wrapCss(css`
      :host {
        height: 100%;
        display: flex;
      }

      .logo {
        width: 96px;
        height: 96px;
        margin: 1em;
        flex-grow: 1;
      }

      .progress-div {
        position: relative;
        width: 400px !important;
      }

      .progress-label {
        position: absolute;
        top: 0;
        left: 50%;
        transform: translateX(-50%);
        font-size: calc(1.5rem / 1.5);
        line-height: 1.5rem;
      }

      .loaded-prog {
        margin-bottom: 1em;
      }

      .error {
        white-space: pre-wrap;
        margin-bottom: 2em;
      }

      section.container {
        margin: auto;
      }

      .extra-msg {
        font-size: 0.8rem;
      }
    `);
  }

  render() {
    return html`
      <section class="container">
        <div class="has-text-centered is-flex">
          <wr-anim-logo class="logo" size="96px"></wr-anim-logo>
        </div>
        ${!this.embed
          ? html` <div class="level">
              <p class="level-item">Loading&nbsp;<b>${this.sourceUrl}</b>...</p>
            </div>`
          : ""}
        <div class="level">
          <div class="level-item has-text-centered">
            ${this.renderContent()}
          </div>
        </div>
      </section>
    `;
  }

  renderContent() {
    switch (this.state) {
      case "googledrive":
        return html`<wr-gdrive
          .sourceUrl=${this.sourceUrl}
          @load-ready=${this.onLoadReady}
        ></wr-gdrive>`;

      case "started":
        return html` <div class="progress-div">
          <progress
            id="progress"
            class="progress is-primary is-large"
            value="${this.percent}"
            max="100"
          ></progress>
          <label class="progress-label" for="progress">${this.percent}%</label>
          ${this.currentSize && this.totalSize
            ? html` <div class="loaded-prog">
                Loaded <b>${prettyBytes(this.currentSize)}</b> of
                <b>${prettyBytes(this.totalSize)}</b>
                ${this.extraMsg &&
                html` <p class="extra-msg">(${this.extraMsg})</p> `}
              </div>`
            : html``}
          ${!this.embed
            ? html` <button @click="${this.onCancel}" class="button is-danger">
                Cancel
              </button>`
            : ""}
        </div>`;

      case "errored":
        return html` <div class="has-text-left">
          <div class="error has-text-danger">${this.error}</div>
          <div>
            ${this.errorAllowRetry
              ? html` <a
                  class="button is-warning"
                  @click=${() => window.parent.location.reload()}
                  >Try Again</a
                >`
              : ""}
            ${this.embed
              ? html``
              : html` <a href="/" class="button is-warning">Back</a>`}
          </div>
        </div>`;

      case "permission_needed":
        return html` <div class="has-text-left">
          <div class="">
            Permission is needed to reload the archive file. (Click
            <i>Cancel</i> to cancel loading this archive.)
          </div>
          <button @click="${this.onAskPermission}" class="button is-primary">
            Show Permission
          </button>
          <a href="/" class="button is-danger">Cancel</a>
        </div>`;

      case "waiting":
      default:
        return html`<progress
          class="progress is-primary is-large"
          style="max-width: 400px"
        ></progress>`;
    }
  }

  async onAskPermission() {
    const result = await this.fileHandle.requestPermission({ mode: "read" });
    if (result === "granted") {
      this.doLoad();
    }
  }
}

customElements.define("wr-loader", Loader);

export { Loader };