import { clsx } from "clsx";
import { FC, useEffect, useRef, useState } from "react";
import { useSelector } from "react-redux";
import { useSearchParams } from "react-router-dom";

import CharacterSheetSvg from "@dndbeyond/fontawesome-cache/svgs/light/address-card.svg";
import CheckMark from "@dndbeyond/fontawesome-cache/svgs/light/circle-check.svg";
import PdfSvg from "@dndbeyond/fontawesome-cache/svgs/light/file-pdf.svg";

import { Button } from "~/components/Button";
import { usePdfExport } from "~/hooks/usePdfExport";
import pageStyles from "~/subApps/builder/styles/page.module.css";
import {
  builderEnvSelectors,
  builderSelectors,
} from "~/tools/js/CharacterBuilder/selectors";
import { appEnvSelectors } from "~/tools/js/Shared/selectors";
import { ClipboardUtils, MobileMessengerUtils } from "~/tools/js/Shared/utils";

import styles from "./styles.module.css";

export const WhatsNext: FC = () => {
  const characterId = useSelector(appEnvSelectors.getCharacterId);
  const characterListingUrl = useSelector(
    builderEnvSelectors.getProfileCharacterListingUrl
  );
  const characterSheetUrl = useSelector(
    builderEnvSelectors.getCharacterSheetUrl
  );
  const isCharacterSheetReady = useSelector(
    builderSelectors.checkIsCharacterSheetReady
  );
  const [searchParams] = useSearchParams();
  const isVttView = searchParams.get("view") === "vtt";

  const urlInput = useRef<HTMLInputElement>(null);

  const { exportPdf, isLoading, isFinished, pdfUrl } = usePdfExport();

  const [hasCopied, setHasCopied] = useState(false);

  useEffect(() => {
    if (pdfUrl !== null && isFinished) {
      urlInput.current?.focus();
      urlInput.current?.setSelectionRange(0, urlInput.current.value.length);
    }
  }, [isFinished, pdfUrl]);

  const handleExportPdf = (evt: React.MouseEvent): void => {
    if (isCharacterSheetReady && !isLoading && !isFinished) {
      exportPdf();
    }
  };

  const handleClick = (evt: React.MouseEvent): void => {
    ClipboardUtils.copyTextToClipboard(pdfUrl === null ? "" : pdfUrl);
    setHasCopied(true);
  };

  const handleMobileSheetShowClick = () => {
    if (characterId !== null && isCharacterSheetReady) {
      MobileMessengerUtils.sendMessage(
        MobileMessengerUtils.createShowCharacterSheetMessage(characterId)
      );
    }
  };

  const renderPdfData = (): React.ReactNode => {
    if (!isFinished || pdfUrl === null) {
      return null;
    }

    return (
      <div className={styles.pdfSection}>
        <div className={styles.pdfInputWrapper}>
          <label className={styles.pdfDataLabel}>
            <PdfSvg /> PDF Generated
          </label>

          <input
            type="text"
            value={pdfUrl ? pdfUrl.replace(/https*:\/\//, "") : ""}
            className={styles.pdfDataInput}
            ref={urlInput}
          />
        </div>
        <Button
          className={styles.pdfDataClipboard}
          size="small"
          variant="text"
          onClick={handleClick}
        >
          {hasCopied ? <>Copied! &#x2714;</> : "Click to Copy"}
        </Button>
        {pdfUrl !== null && (
          <Button
            className={styles.button}
            href={pdfUrl}
            size={"large"}
            download={true}
            variant="builder"
          >
            Click to Download
          </Button>
        )}
      </div>
    );
  };

  const getPdfButtonText = (): string => {
    if (isLoading) {
      return "Exporting PDF...";
    } else if (isFinished) {
      return "PDF Generated";
    }
    return "Export to PDF";
  };

  const ButtonLinkProps = {
    href: characterSheetUrl,
  };
  return (
    <div className={pageStyles.page}>
      <p>
        Once you have completed creating your character, you can view your
        statistics on the digital character sheet or export it for printing.
      </p>

      <div className={styles.buttonWrapper}>
        <Button
          className={styles.button}
          size="large"
          variant="builder"
          disabled={!isCharacterSheetReady}
          onClick={handleMobileSheetShowClick}
          {...(isCharacterSheetReady ? ButtonLinkProps : {})}
        >
          <CharacterSheetSvg />
          <span className={styles.buttonText}>
            View Character Sheet
            {!isCharacterSheetReady && (
              <span className={styles.buttonSubText}>
                Unavailable - Character Incomplete
              </span>
            )}
          </span>
        </Button>
        {!isVttView && (
          <Button
            className={clsx([
              styles.button,
              isFinished && styles.buttonComplete,
            ])}
            size="large"
            variant="builder"
            disabled={!isCharacterSheetReady}
            onClick={handleExportPdf}
          >
            {!isFinished ? <PdfSvg /> : <CheckMark />}
            {getPdfButtonText()}
          </Button>
        )}
      </div>
      {renderPdfData()}
      {!isCharacterSheetReady && (
        <p className={styles.returnToHomeText}>
          If you are unable to create a character due to missing options, return
          to the <strong>Home</strong> tab and change your source settings.
        </p>
      )}

      <div className={styles.section}>
        {!isVttView && (
          <Button
            className={styles.button}
            variant="builder-text"
            href={characterListingUrl}
          >
            View all my characters
          </Button>
        )}

        <h2 className={pageStyles.title}>Come Together</h2>

        <p>
          Most D&amp;D characters don't work alone. Each character plays a role
          within a party, a group of adventurers working together for a common
          purpose. Talk to your fellow players and your DM to decide whether
          your characters know one another, how they met, and what sorts of
          quests the group might undertake.
        </p>

        <p>
          A campaign is a series of adventures undertaken by your group's
          characters. If your DM has a campaign, you can join it by visiting the
          invite link for the campaign. You can also start your own.
        </p>

        {!isVttView && (
          <Button
            variant="builder-text"
            href="/campaigns/create"
            className={styles.button}
          >
            Start a new campaign
          </Button>
        )}
      </div>
    </div>
  );
};