import { mdiContentCopy, mdiDownload } from "@mdi/js";
import type { CSSResultGroup } from "lit";
import { LitElement, css, html, nothing } from "lit";
import { customElement, property, query, state } from "lit/decorators";
import { fireEvent } from "../../../../common/dom/fire_event";
import { copyToClipboard } from "../../../../common/util/copy-clipboard";
import "../../../../components/ha-button";
import "../../../../components/ha-dialog";
import "../../../../components/ha-dialog-footer";
import "../../../../components/ha-icon-button";
import "../../../../components/item/ha-row-item";
import {
  downloadEmergencyKit,
  generateEncryptionKey,
} from "../../../../data/backup";
import type { HassDialog } from "../../../../dialogs/make-dialog-manager";
import { haStyle, haStyleDialog } from "../../../../resources/styles";
import type { HomeAssistant } from "../../../../types";
import { showToast } from "../../../../util/toast";
import type { SetBackupEncryptionKeyDialogParams } from "./show-dialog-set-backup-encryption-key";

const STEPS = ["key", "done"] as const;

type Step = (typeof STEPS)[number];

@customElement("ha-dialog-set-backup-encryption-key")
class DialogSetBackupEncryptionKey extends LitElement implements HassDialog {
  @property({ attribute: false }) public hass!: HomeAssistant;

  @state() private _open = false;

  @state() private _step?: Step;

  @state() private _params?: SetBackupEncryptionKeyDialogParams;

  @state() private _newEncryptionKey?: string;

  @query("div") private _copyContainer?: HTMLElement;

  public showDialog(params: SetBackupEncryptionKeyDialogParams): void {
    this._params = params;
    this._step = STEPS[0];
    this._open = true;
    this._newEncryptionKey = generateEncryptionKey();
  }

  public closeDialog() {
    this._open = false;
    return true;
  }

  private _dialogClosed() {
    if (this._params?.cancel) {
      this._params.cancel();
    }
    this._step = undefined;
    this._params = undefined;
    this._newEncryptionKey = undefined;
    this._open = false;
    fireEvent(this, "dialog-closed", { dialog: this.localName });
  }

  private _done() {
    this._params?.submit!(true);
    this.closeDialog();
  }

  private _nextStep() {
    const index = STEPS.indexOf(this._step!);
    if (index === STEPS.length - 1) {
      return;
    }
    this._step = STEPS[index + 1];
  }

  protected render() {
    if (!this._params || !this._step) {
      return nothing;
    }

    const dialogTitle =
      this._step === "key"
        ? this.hass.localize(
            `ui.panel.config.backup.dialogs.set_encryption_key.key.title`
          )
        : "";

    return html`
      <ha-dialog
        .open=${this._open}
        header-title=${dialogTitle}
        prevent-scrim-close
        @closed=${this._dialogClosed}
      >
        ${this._renderStepContent()}
        <ha-dialog-footer slot="footer">
          ${this._step === "key"
            ? html`
                <ha-button
                  slot="primaryAction"
                  @click=${this._submit}
                  .disabled=${!this._newEncryptionKey}
                >
                  ${this.hass.localize(
                    "ui.panel.config.backup.dialogs.set_encryption_key.actions.set"
                  )}
                </ha-button>
              `
            : html`
                <ha-button slot="primaryAction" @click=${this._done}>
                  ${this.hass.localize(
                    "ui.panel.config.backup.dialogs.set_encryption_key.actions.done"
                  )}
                </ha-button>
              `}
        </ha-dialog-footer>
      </ha-dialog>
    `;
  }

  private _renderStepContent() {
    switch (this._step) {
      case "key":
        return html`
          <p>
            ${this.hass.localize(
              "ui.panel.config.backup.dialogs.set_encryption_key.new.description"
            )}
          </p>
          <div class="encryption-key">
            <p>${this._newEncryptionKey}</p>
            <ha-icon-button
              .path=${mdiContentCopy}
              @click=${this._copyKeyToClipboard}
            ></ha-icon-button>
          </div>
          <ha-row-item>
            <span slot="headline">
              ${this.hass.localize(
                "ui.panel.config.backup.encryption_key.download_emergency_kit"
              )}
            </span>
            <span slot="supporting-text">
              ${this.hass.localize(
                "ui.panel.config.backup.encryption_key.download_emergency_kit_description"
              )}
            </span>
            <ha-button
              size="s"
              appearance="plain"
              slot="end"
              @click=${this._download}
            >
              <ha-svg-icon .path=${mdiDownload} slot="start"></ha-svg-icon>
              ${this.hass.localize(
                "ui.panel.config.backup.encryption_key.download_emergency_kit_action"
              )}
            </ha-button>
          </ha-row-item>
        `;
      case "done":
        return html`
          <div class="done">
            <img
              src="/static/images/voice-assistant/hi.png"
              alt="Casita Home Assistant logo"
            />
            <h1>
              ${this.hass.localize(
                "ui.panel.config.backup.dialogs.set_encryption_key.done.title"
              )}
            </h1>
          </div>
        `;
    }
    return nothing;
  }

  private async _copyKeyToClipboard() {
    await copyToClipboard(this._newEncryptionKey, this._copyContainer!);
    showToast(this, {
      message: this.hass.localize("ui.common.copied_clipboard"),
    });
  }

  private _download() {
    if (!this._newEncryptionKey) {
      return;
    }
    downloadEmergencyKit(this.hass, this._newEncryptionKey);
  }

  private async _submit() {
    if (!this._newEncryptionKey) {
      return;
    }
    this._params!.saveKey(this._newEncryptionKey);
    this._nextStep();
  }

  static get styles(): CSSResultGroup {
    return [
      haStyle,
      haStyleDialog,
      css`
        ha-dialog {
          --dialog-content-padding: var(--ha-space-2) var(--ha-space-6);
        }
        ha-row-item {
          --ha-row-item-padding-inline: 0;
        }
        .encryption-key {
          border: 1px solid var(--divider-color);
          background-color: var(--primary-background-color);
          border-radius: var(--ha-border-radius-md);
          padding: 16px;
          display: flex;
          flex-direction: row;
          align-items: center;
          gap: var(--ha-space-6);
        }
        .encryption-key p {
          margin: 0;
          flex: 1;
          font-size: var(--ha-font-size-xl);
          font-family: var(--ha-font-family-code);
          font-style: normal;
          font-weight: var(--ha-font-weight-normal);
          line-height: var(--ha-line-height-condensed);
          text-align: center;
        }
        .encryption-key ha-icon-button {
          flex: none;
          margin: -16px;
        }
        p {
          margin-top: 0;
        }
        .done {
          text-align: center;
        }
      `,
    ];
  }
}

declare global {
  interface HTMLElementTagNameMap {
    "ha-dialog-set-backup-encryption-key": DialogSetBackupEncryptionKey;
  }
}
