import { Directive, EventEmitter, OnDestroy, OnInit, Output } from "@angular/core";
import { UntypedFormBuilder, Validators } from "@angular/forms";
import { merge, takeUntil, Subject, startWith } from "rxjs";

import { CryptoService } from "@bitwarden/common/abstractions/crypto.service";
import { EventCollectionService } from "@bitwarden/common/abstractions/event/event-collection.service";
import { ExportService } from "@bitwarden/common/abstractions/export.service";
import { FileDownloadService } from "@bitwarden/common/abstractions/fileDownload/fileDownload.service";
import { I18nService } from "@bitwarden/common/abstractions/i18n.service";
import { LogService } from "@bitwarden/common/abstractions/log.service";
import { PlatformUtilsService } from "@bitwarden/common/abstractions/platformUtils.service";
import { UserVerificationService } from "@bitwarden/common/abstractions/userVerification/userVerification.service.abstraction";
import { PolicyService } from "@bitwarden/common/admin-console/abstractions/policy/policy.service.abstraction";
import { PolicyType } from "@bitwarden/common/admin-console/enums";
import { EncryptedExportType, EventType } from "@bitwarden/common/enums";

@Directive()
export class ExportComponent implements OnInit, OnDestroy {
  @Output() onSaved = new EventEmitter();

  formPromise: Promise<string>;
  disabledByPolicy = false;

  exportForm = this.formBuilder.group({
    format: ["json"],
    secret: [""],
    filePassword: ["", Validators.required],
    confirmFilePassword: ["", Validators.required],
    fileEncryptionType: [EncryptedExportType.AccountEncrypted],
  });

  formatOptions = [
    { name: ".json", value: "json" },
    { name: ".csv", value: "csv" },
    { name: ".json (Encrypted)", value: "encrypted_json" },
  ];

  private destroy$ = new Subject<void>();

  constructor(
    protected cryptoService: CryptoService,
    protected i18nService: I18nService,
    protected platformUtilsService: PlatformUtilsService,
    protected exportService: ExportService,
    protected eventCollectionService: EventCollectionService,
    private policyService: PolicyService,
    protected win: Window,
    private logService: LogService,
    private userVerificationService: UserVerificationService,
    private formBuilder: UntypedFormBuilder,
    protected fileDownloadService: FileDownloadService
  ) {}

  async ngOnInit() {
    this.policyService
      .policyAppliesToActiveUser$(PolicyType.DisablePersonalVaultExport)
      .pipe(takeUntil(this.destroy$))
      .subscribe((policyAppliesToActiveUser) => {
        this.disabledByPolicy = policyAppliesToActiveUser;
      });

    await this.checkExportDisabled();

    merge(
      this.exportForm.get("format").valueChanges,
      this.exportForm.get("fileEncryptionType").valueChanges
    )
      .pipe(takeUntil(this.destroy$))
      .pipe(startWith(0))
      .subscribe(() => this.adjustValidators());
  }

  ngOnDestroy(): void {
    this.destroy$.next();
  }

  async checkExportDisabled() {
    if (this.disabledByPolicy) {
      this.exportForm.disable();
    }
  }

  get encryptedFormat() {
    return this.format === "encrypted_json";
  }

  protected async doExport() {
    try {
      this.formPromise = this.getExportData();
      const data = await this.formPromise;
      this.downloadFile(data);
      this.saved();
      await this.collectEvent();
      this.exportForm.get("secret").setValue("");
      this.exportForm.clearValidators();
    } catch (e) {
      this.logService.error(e);
    }
  }

  async submit() {
    if (this.disabledByPolicy) {
      this.platformUtilsService.showToast(
        "error",
        null,
        this.i18nService.t("personalVaultExportPolicyInEffect")
      );
      return;
    }

    const acceptedWarning = await this.warningDialog();
    if (!acceptedWarning) {
      return;
    }
    const secret = this.exportForm.get("secret").value;

    try {
      await this.userVerificationService.verifyUser(secret);
    } catch (e) {
      this.platformUtilsService.showToast("error", this.i18nService.t("errorOccurred"), e.message);
      return;
    }

    this.doExport();
  }

  async warningDialog() {
    if (this.encryptedFormat) {
      return await this.platformUtilsService.showDialog(
        "<p>" +
          this.i18nService.t("encExportKeyWarningDesc") +
          "<p>" +
          this.i18nService.t("encExportAccountWarningDesc"),
        this.i18nService.t("confirmVaultExport"),
        this.i18nService.t("exportVault"),
        this.i18nService.t("cancel"),
        "warning",
        true
      );
    } else {
      return await this.platformUtilsService.showDialog(
        this.i18nService.t("exportWarningDesc"),
        this.i18nService.t("confirmVaultExport"),
        this.i18nService.t("exportVault"),
        this.i18nService.t("cancel"),
        "warning"
      );
    }
  }

  protected saved() {
    this.onSaved.emit();
  }

  protected getExportData() {
    if (
      this.format === "encrypted_json" &&
      this.fileEncryptionType === EncryptedExportType.FileEncrypted
    ) {
      return this.exportService.getPasswordProtectedExport(this.filePassword);
    } else {
      return this.exportService.getExport(this.format, null);
    }
  }

  protected getFileName(prefix?: string) {
    let extension = this.format;
    if (this.format === "encrypted_json") {
      if (prefix == null) {
        prefix = "encrypted";
      } else {
        prefix = "encrypted_" + prefix;
      }
      extension = "json";
    }
    return this.exportService.getFileName(prefix, extension);
  }

  protected async collectEvent(): Promise<void> {
    await this.eventCollectionService.collect(EventType.User_ClientExportedVault);
  }

  get format() {
    return this.exportForm.get("format").value;
  }

  get filePassword() {
    return this.exportForm.get("filePassword").value;
  }

  get confirmFilePassword() {
    return this.exportForm.get("confirmFilePassword").value;
  }

  get fileEncryptionType() {
    return this.exportForm.get("fileEncryptionType").value;
  }

  adjustValidators() {
    this.exportForm.get("confirmFilePassword").reset();
    this.exportForm.get("filePassword").reset();

    if (this.encryptedFormat && this.fileEncryptionType == EncryptedExportType.FileEncrypted) {
      this.exportForm.controls.filePassword.enable();
      this.exportForm.controls.confirmFilePassword.enable();
    } else {
      this.exportForm.controls.filePassword.disable();
      this.exportForm.controls.confirmFilePassword.disable();
    }
  }

  private downloadFile(csv: string): void {
    const fileName = this.getFileName();
    this.fileDownloadService.download({
      fileName: fileName,
      blobData: csv,
      blobOptions: { type: "text/plain" },
    });
  }
}