'use client';

import Link from 'next/link';
import { useTranslations } from 'next-intl';
import { useEffect, useRef, useState } from 'react';
import { appVersion } from '@/lib/app-version';
import { dataUrlToBlob, sendBugReport } from '@/lib/bug-report-api';
import { getDesktopClientInfo, isDesktopClient } from '@/lib/desktop-client';
import { formatErrorsForReport } from '@/lib/error-buffer';

/**
 * Dialog des Fehler-melden-Knopfs (quick-260914-m97). Muster:
 * `marketplace/components/ActivationDialog.tsx` (Overlay, `role="dialog"`,
 * Escape, Fokus). Bekommt das bereits aufgenommene Bild als Data-URL —
 * die Aufnahme passiert im Knopf, BEVOR dieser Dialog erscheint.
 *
 * Der Dialog wird nur eingehaengt, solange er offen ist (quick-260921-ldf):
 * jedes Oeffnen ist ein frischer Mount, damit gilt der Anfangszustand schon
 * im ERSTEN Commit. Vorher zog ein Effekt den Zustand erst einen Commit
 * spaeter nach — dazwischen stand sichtbar "Bild da, Haekchen aus" im DOM.
 */
interface BugReportDialogProps {
  screenshot: string | null;
  isAdmin: boolean;
  onClose: () => void;
}

type Status = 'ready' | 'sending' | 'sent' | 'failed';

export function BugReportDialog({ screenshot, isAdmin, onClose }: BugReportDialogProps) {
  const t = useTranslations('bugReport');
  const textareaRef = useRef<HTMLTextAreaElement>(null);
  const [status, setStatus] = useState<Status>('ready');
  const [failedStatus, setFailedStatus] = useState(0);
  const [description, setDescription] = useState('');
  // Das Haekchen wird beim Rendern aus `screenshot` abgeleitet, nicht per
  // Effekt nachgezogen: gibt es ein Bild, ist es an. `attachChoice` haelt
  // allein die bewusste Abwahl des Nutzers.
  const [attachChoice, setAttachChoice] = useState<boolean | null>(null);
  const attach = screenshot !== null && (attachChoice ?? true);

  useEffect(() => {
    textareaRef.current?.focus();
  }, []);

  useEffect(() => {
    const handler = (e: KeyboardEvent) => {
      if (e.key === 'Escape' && status !== 'sending') onClose();
    };
    document.addEventListener('keydown', handler);
    return () => document.removeEventListener('keydown', handler);
  }, [status, onClose]);

  const handleSend = async () => {
    setStatus('sending');
    // Herkunft (quick-260918-gza): tessera_desktop entscheidet Desktop/
    // Browser, tessera_desktop_client liefert die Details dazu; fehlt es
    // (alter Client), bleibt es bei Desktop ohne Details.
    const desktop = isDesktopClient();
    const info = desktop ? getDesktopClientInfo() : null;
    const result = await sendBugReport({
      description: description.trim(),
      page: window.location.pathname + window.location.search,
      webVersion: appVersion.version,
      webChannel: appVersion.channel,
      webCommit: appVersion.commit,
      userAgent: navigator.userAgent,
      viewport: `${window.innerWidth}x${window.innerHeight}`,
      clientTime: new Date().toISOString(),
      errors: formatErrorsForReport(),
      screenshot: attach && screenshot ? dataUrlToBlob(screenshot) : null,
      clientKind: desktop ? 'desktop' : 'browser',
      clientOs: info?.os ?? '',
      clientVersion: info?.version ?? '',
      clientCommit: info?.commit ?? '',
    });
    if (result.ok) {
      setStatus('sent');
    } else {
      setFailedStatus(result.status);
      setStatus('failed');
    }
  };

  const errorKey =
    failedStatus === 409
      ? 'errorNotConfigured'
      : failedStatus === 429
        ? 'errorTooMany'
        : failedStatus === 413
          ? 'errorTooLarge'
          : failedStatus === 502
            ? 'errorSendFailed'
            : 'errorGeneric';

  const busy = status === 'sending';

  return (
    <div
      className="fixed inset-0 z-50 flex items-center justify-center bg-black/50"
      role="dialog"
      aria-modal="true"
      aria-labelledby="bug-report-title"
      data-bug-report-ignore="true"
    >
      <div className="w-full max-w-lg rounded-lg bg-card dark:border dark:border-border p-6 shadow-lg">
        <h2 id="bug-report-title" className="text-lg font-semibold text-foreground mb-2">
          {t('title')}
        </h2>

        {status === 'sent' ? (
          <>
            <p className="text-sm text-foreground mb-4">{t('sent')}</p>
            <div className="flex justify-end">
              <button type="button" onClick={onClose} className="btn btn-primary">
                {t('close')}
              </button>
            </div>
          </>
        ) : (
          <>
            <p className="text-sm text-muted-foreground mb-4">{t('intro')}</p>

            {screenshot ? (
              <img
                src={screenshot}
                alt={t('screenshotAlt')}
                className="max-h-48 w-auto rounded border border-border mb-3"
              />
            ) : (
              <p className="text-sm text-muted-foreground mb-3">{t('screenshotUnavailable')}</p>
            )}

            <div className="flex items-center gap-2 mb-3">
              <input
                id="bug-report-attach"
                type="checkbox"
                className="h-4 w-4"
                checked={attach}
                disabled={screenshot === null || busy}
                onChange={(e) => setAttachChoice(e.target.checked)}
              />
              <label htmlFor="bug-report-attach" className="text-sm text-foreground">
                {t('attachScreenshot')}
              </label>
            </div>

            <label htmlFor="bug-report-description" className="mb-1 block text-sm text-foreground">
              {t('descriptionLabel')}
            </label>
            <textarea
              id="bug-report-description"
              ref={textareaRef}
              rows={4}
              maxLength={4000}
              placeholder={t('descriptionPlaceholder')}
              className="w-full rounded border border-border bg-background px-3 py-2 text-sm text-foreground"
              value={description}
              disabled={busy}
              onChange={(e) => setDescription(e.target.value)}
            />

            {status === 'failed' && (
              <div className="mt-3 text-sm text-destructive">
                <p>{t(errorKey)}</p>
                {failedStatus === 409 && isAdmin && (
                  <p className="mt-1">
                    {t('errorNotConfiguredAdminHint')}{' '}
                    <Link href="/admin/smtp" className="underline">
                      {t('errorNotConfiguredAdminLink')}
                    </Link>
                  </p>
                )}
              </div>
            )}

            <div className="mt-4 flex justify-end gap-3">
              <button type="button" onClick={onClose} disabled={busy} className="btn btn-secondary">
                {t('cancel')}
              </button>
              <button
                type="button"
                onClick={handleSend}
                disabled={busy}
                className="btn btn-primary"
              >
                {busy ? t('sending') : t('send')}
              </button>
            </div>
          </>
        )}
      </div>
    </div>
  );
}