import { CopyableModal } from "../../elements/CopyableModal";
import { FileUploadInput } from "../../elements/FileUploadInput";
import { Margin } from "../../elements/Margin";
import { Page } from "../../types/Page";
import { changePage, setErrorText, setPageContent, setTitleElement } from "../../pageUtils";
import { fileToBase64, makeElement } from "../../htmlUtils";
import { pageState } from "../../globalPageState";
import { transitEncrypt } from "../../api/transit/transitEncrypt";
import i18next from "i18next";

export class TransitEncryptPage extends Page {
  constructor() {
    super();
  }

  goBack(): void {
    changePage("TRANSIT_VIEW_SECRET");
  }

  transitEncryptForm: HTMLFormElement;

  render(): void {
    setTitleElement(pageState);
    setPageContent(
      makeElement({
        tag: "div",
      }),
    );
    this.transitEncryptForm = makeElement({
      tag: "form",
      children: [
        Margin(
          makeElement({
            tag: "textarea",
            class: ["uk-textarea", "uk-form-width-medium"],
            attributes: {
              placeholder: i18next.t("transit_encrypt_input_placeholder"),
              name: "plaintext",
            },
          }),
        ),
        Margin(FileUploadInput("plaintext_file")),
        Margin([
          makeElement({
            tag: "div",
            class: "uk-form-label",
            text: i18next.t("transit_encrypt_already_encoded_checkbox"),
          }),
          makeElement({
            tag: "div",
            class: ["uk-form-controls", "uk-form-controls-text"],
            children: makeElement({
              tag: "input",
              class: "uk-checkbox",
              attributes: {
                type: "checkbox",
                name: "base64Checkbox",
              },
            }),
          }),
        ]),
        makeElement({
          tag: "p",
          id: "errorText",
          class: "uk-text-danger",
        }),
        makeElement({
          tag: "button",
          class: ["uk-button", "uk-button-primary"],
          text: i18next.t("transit_encrypt_encrypt_btn"),
          attributes: {
            type: "submit",
          },
        }),
      ],
    }) as HTMLFormElement;
    setPageContent(this.transitEncryptForm);

    this.transitEncryptForm.addEventListener("submit", (e: Event) => {
      e.preventDefault();
      void this.transitEncryptFormHandler();
    });
  }

  async transitEncryptFormHandler(): Promise<void> {
    const formData = new FormData(this.transitEncryptForm);

    const base64Checkbox = formData.get("base64Checkbox") as string;

    let plaintext = formData.get("plaintext") as string;

    const plaintext_file = formData.get("plaintext_file") as File;
    if (plaintext_file.size > 0) {
      plaintext = (await fileToBase64(plaintext_file)).replace("data:text/plain;base64,", "");
      plaintext = base64Checkbox == "on" ? atob(plaintext) : plaintext;
    } else {
      plaintext = base64Checkbox == "on" ? plaintext : btoa(plaintext);
    }

    try {
      const res = await transitEncrypt(pageState.currentBaseMount, pageState.currentSecret, {
        plaintext: plaintext,
      });
      const modal = CopyableModal(
        i18next.t("transit_encrypt_encryption_result_modal_title"),
        res.ciphertext,
      );
      document.body.querySelector("#pageContent").appendChild(modal);
      modal.show();
    } catch (e: unknown) {
      const error = e as Error;
      setErrorText(`API Error: ${error.message}`);
    }
  }

  get titleSuffix(): string {
    return i18next.t("transit_encrypt_suffix");
  }

  get name(): string {
    return i18next.t("transit_encrypt_title");
  }
}