import { CommonModule } from "@angular/common";
import { Component, DestroyRef } from "@angular/core";
import { takeUntilDestroyed } from "@angular/core/rxjs-interop";
import { firstValueFrom } from "rxjs";

import { LoginApprovalComponent } from "@bitwarden/auth/angular";
import { AuthRequestApiServiceAbstraction } from "@bitwarden/auth/common";
import { DevicesServiceAbstraction } from "@bitwarden/common/auth/abstractions/devices/devices.service.abstraction";
import {
  DevicePendingAuthRequest,
  DeviceResponse,
} from "@bitwarden/common/auth/abstractions/devices/responses/device.response";
import { DeviceView } from "@bitwarden/common/auth/abstractions/devices/views/device.view";
import { DeviceType, DeviceTypeMetadata } from "@bitwarden/common/enums";
import { I18nService } from "@bitwarden/common/platform/abstractions/i18n.service";
import { ValidationService } from "@bitwarden/common/platform/abstractions/validation.service";
import { MessageListener } from "@bitwarden/common/platform/messaging";
import {
  DialogService,
  ToastService,
  TableDataSource,
  TableModule,
  PopoverModule,
} from "@bitwarden/components";

import { SharedModule } from "../../../shared";

/**
 * Interface representing a row in the device management table
 */
interface DeviceTableData {
  id: string;
  type: DeviceType;
  displayName: string;
  loginStatus: string;
  firstLogin: Date;
  trusted: boolean;
  devicePendingAuthRequest: DevicePendingAuthRequest | null;
  hasPendingAuthRequest: boolean;
  identifier: string;
}

/**
 * Provides a table of devices and allows the user to log out, approve or remove a device
 */
@Component({
  selector: "app-device-management",
  templateUrl: "./device-management.component.html",
  imports: [CommonModule, SharedModule, TableModule, PopoverModule],
})
export class DeviceManagementComponent {
  protected dataSource = new TableDataSource<DeviceTableData>();
  protected currentDevice: DeviceView | undefined;
  protected loading = true;
  protected asyncActionLoading = false;

  constructor(
    private i18nService: I18nService,
    private devicesService: DevicesServiceAbstraction,
    private dialogService: DialogService,
    private toastService: ToastService,
    private validationService: ValidationService,
    private messageListener: MessageListener,
    private authRequestApiService: AuthRequestApiServiceAbstraction,
    private destroyRef: DestroyRef,
  ) {
    void this.initializeDevices();
  }

  /**
   * Initialize the devices list and set up the message listener
   */
  private async initializeDevices(): Promise<void> {
    try {
      await this.loadDevices();

      this.messageListener.allMessages$
        .pipe(takeUntilDestroyed(this.destroyRef))
        .subscribe((message) => {
          if (message.command !== "openLoginApproval") {
            return;
          }
          // Handle inserting a new device when an auth request is received
          this.upsertDeviceWithPendingAuthRequest(
            message as { command: string; notificationId: string },
          ).catch((error) => this.validationService.showError(error));
        });
    } catch (error) {
      this.validationService.showError(error);
    }
  }

  /**
   * Handle inserting a new device when an auth request is received
   * @param message - The auth request message
   */
  private async upsertDeviceWithPendingAuthRequest(message: {
    command: string;
    notificationId: string;
  }): Promise<void> {
    const requestId = message.notificationId;
    if (!requestId) {
      return;
    }

    const authRequestResponse = await this.authRequestApiService.getAuthRequest(requestId);
    if (!authRequestResponse) {
      return;
    }

    // Add new device to the table
    const upsertDevice: DeviceTableData = {
      id: "",
      type: authRequestResponse.requestDeviceTypeValue,
      displayName: this.getHumanReadableDeviceType(authRequestResponse.requestDeviceTypeValue),
      loginStatus: this.i18nService.t("requestPending"),
      firstLogin: new Date(authRequestResponse.creationDate),
      trusted: false,
      devicePendingAuthRequest: {
        id: authRequestResponse.id,
        creationDate: authRequestResponse.creationDate,
      },
      hasPendingAuthRequest: true,
      identifier: authRequestResponse.requestDeviceIdentifier,
    };

    // If the device already exists in the DB, update the device id and first login date
    if (authRequestResponse.requestDeviceIdentifier) {
      const existingDevice = await firstValueFrom(
        this.devicesService.getDeviceByIdentifier$(authRequestResponse.requestDeviceIdentifier),
      );

      if (existingDevice?.id && existingDevice.creationDate) {
        upsertDevice.id = existingDevice.id;
        upsertDevice.firstLogin = new Date(existingDevice.creationDate);
      }
    }

    const existingDeviceIndex = this.dataSource.data.findIndex(
      (device) => device.identifier === upsertDevice.identifier,
    );

    if (existingDeviceIndex >= 0) {
      // Update existing device
      this.dataSource.data[existingDeviceIndex] = upsertDevice;
      this.dataSource.data = [...this.dataSource.data];
    } else {
      // Add new device
      this.dataSource.data = [upsertDevice, ...this.dataSource.data];
    }
  }

  /**
   * Load current device and all devices
   */
  private async loadDevices(): Promise<void> {
    try {
      const currentDevice = await firstValueFrom(this.devicesService.getCurrentDevice$());
      const devices = await firstValueFrom(this.devicesService.getDevices$());

      if (!currentDevice || !devices) {
        this.loading = false;
        return;
      }

      this.currentDevice = new DeviceView(currentDevice);
      this.updateDeviceTable(devices);
    } catch (error) {
      this.validationService.showError(error);
    } finally {
      this.loading = false;
    }
  }

  /**
   * Updates the device table with the latest device data
   * @param devices - Array of device views to display in the table
   */
  private updateDeviceTable(devices: Array<DeviceView>): void {
    this.dataSource.data = devices
      .map((device: DeviceView): DeviceTableData | null => {
        if (!device.id) {
          this.validationService.showError(new Error(this.i18nService.t("deviceIdMissing")));
          return null;
        }

        if (device.type == undefined) {
          this.validationService.showError(new Error(this.i18nService.t("deviceTypeMissing")));
          return null;
        }

        if (!device.creationDate) {
          this.validationService.showError(
            new Error(this.i18nService.t("deviceCreationDateMissing")),
          );
          return null;
        }

        const hasPendingRequest = device.response
          ? this.hasPendingAuthRequest(device.response)
          : false;
        return {
          id: device.id,
          type: device.type,
          displayName: this.getHumanReadableDeviceType(device.type),
          loginStatus: this.getLoginStatus(device),
          firstLogin: new Date(device.creationDate),
          trusted: device.response?.isTrusted ?? false,
          devicePendingAuthRequest: device.response?.devicePendingAuthRequest ?? null,
          hasPendingAuthRequest: hasPendingRequest,
          identifier: device.identifier ?? "",
        };
      })
      .filter((device): device is DeviceTableData => device !== null);
  }

  /**
   * Column configuration for the table
   */
  protected readonly columnConfig = [
    {
      name: "displayName",
      title: this.i18nService.t("device"),
      headerClass: "tw-w-1/3",
      sortable: true,
    },
    {
      name: "loginStatus",
      title: this.i18nService.t("loginStatus"),
      headerClass: "tw-w-1/3",
      sortable: true,
    },
    {
      name: "firstLogin",
      title: this.i18nService.t("firstLogin"),
      headerClass: "tw-w-1/3",
      sortable: true,
    },
  ];

  /**
   * Get the icon for a device type
   * @param type - The device type
   * @returns The icon for the device type
   */
  getDeviceIcon(type: DeviceType): string {
    const defaultIcon = "bwi bwi-desktop";
    const categoryIconMap: Record<string, string> = {
      webVault: "bwi bwi-browser",
      desktop: "bwi bwi-desktop",
      mobile: "bwi bwi-mobile",
      cli: "bwi bwi-cli",
      extension: "bwi bwi-puzzle",
      sdk: "bwi bwi-desktop",
    };

    const metadata = DeviceTypeMetadata[type];
    return metadata ? (categoryIconMap[metadata.category] ?? defaultIcon) : defaultIcon;
  }

  /**
   * Get the login status of a device
   * It will return the current session if the device is the current device
   * It will return the date of the pending auth request when available
   * @param device - The device
   * @returns The login status
   */
  private getLoginStatus(device: DeviceView): string {
    if (this.isCurrentDevice(device)) {
      return this.i18nService.t("currentSession");
    }

    if (device?.response?.devicePendingAuthRequest?.creationDate) {
      return this.i18nService.t("requestPending");
    }

    return "";
  }

  /**
   * Get a human readable device type from the DeviceType enum
   * @param type - The device type
   * @returns The human readable device type
   */
  private getHumanReadableDeviceType(type: DeviceType): string {
    const metadata = DeviceTypeMetadata[type];
    if (!metadata) {
      return this.i18nService.t("unknownDevice");
    }

    // If the platform is "Unknown" translate it since it is not a proper noun
    const platform =
      metadata.platform === "Unknown" ? this.i18nService.t("unknown") : metadata.platform;
    const category = this.i18nService.t(metadata.category);
    return platform ? `${category} - ${platform}` : category;
  }

  /**
   * Check if a device is the current device
   * @param device - The device or device table data
   * @returns True if the device is the current device, false otherwise
   */
  protected isCurrentDevice(device: DeviceView | DeviceTableData): boolean {
    return "response" in device
      ? device.id === this.currentDevice?.id
      : device.id === this.currentDevice?.id;
  }

  /**
   * Check if a device has a pending auth request
   * @param device - The device response
   * @returns True if the device has a pending auth request, false otherwise
   */
  private hasPendingAuthRequest(device: DeviceResponse): boolean {
    return (
      device.devicePendingAuthRequest !== undefined && device.devicePendingAuthRequest !== null
    );
  }

  /**
   * Open a dialog to approve or deny a pending auth request for a device
   */
  async managePendingAuthRequest(device: DeviceTableData) {
    if (device.devicePendingAuthRequest === undefined || device.devicePendingAuthRequest === null) {
      return;
    }

    const dialogRef = LoginApprovalComponent.open(this.dialogService, {
      notificationId: device.devicePendingAuthRequest.id,
    });

    const result = await firstValueFrom(dialogRef.closed);

    if (result !== undefined && typeof result === "boolean") {
      // auth request approved or denied so reset
      device.devicePendingAuthRequest = null;
      device.hasPendingAuthRequest = false;
    }
  }

  /**
   * Remove a device
   * @param device - The device
   */
  protected async removeDevice(device: DeviceTableData) {
    const confirmed = await this.dialogService.openSimpleDialog({
      title: { key: "removeDevice" },
      content: { key: "removeDeviceConfirmation" },
      type: "warning",
    });

    if (!confirmed) {
      return;
    }

    try {
      this.asyncActionLoading = true;
      await firstValueFrom(this.devicesService.deactivateDevice$(device.id));
      this.asyncActionLoading = false;

      // Remove the device from the data source
      this.dataSource.data = this.dataSource.data.filter((d) => d.id !== device.id);

      this.toastService.showToast({
        title: "",
        message: this.i18nService.t("deviceRemoved"),
        variant: "success",
      });
    } catch (error) {
      this.validationService.showError(error);
    }
  }
}