import { useEffect } from 'react';
import { useMutation } from '@tanstack/react-query';
import { useTranslation } from 'react-i18next';
import { X, Stethoscope, CheckCircle2, XCircle, MinusCircle, Loader2 } from 'lucide-react';
import { api, type CameraDiagnoseResult, type CameraDiagnoseStage } from '../api/client';

interface CameraDiagnoseModalProps {
  printerId: number;
  printerName: string | null;
  onClose: () => void;
}

function StageIcon({ status }: { status: CameraDiagnoseStage['status'] }) {
  if (status === 'ok') return <CheckCircle2 className="w-5 h-5 text-bambu-green flex-shrink-0" />;
  if (status === 'failed') return <XCircle className="w-5 h-5 text-red-600 dark:text-red-400 flex-shrink-0" />;
  return <MinusCircle className="w-5 h-5 text-bambu-gray flex-shrink-0" />;
}

export function CameraDiagnoseModal({ printerId, printerName, onClose }: CameraDiagnoseModalProps) {
  const { t } = useTranslation();

  // Kick the diagnostic off as soon as the modal mounts. There's no
  // "Start" button — opening the modal IS the test. The mutation
  // shape is right here: we want a one-shot POST with isPending /
  // data / error, not a cached query.
  const diagnose = useMutation({
    mutationFn: () => api.diagnoseCamera(printerId),
  });

  useEffect(() => {
    diagnose.mutate();
    // Intentionally only on mount — re-running needs the user to click "Retry".
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    window.addEventListener('keydown', handleKeyDown);
    return () => window.removeEventListener('keydown', handleKeyDown);
  }, [onClose]);

  const result = diagnose.data as CameraDiagnoseResult | undefined;

  return (
    <div
      className="fixed inset-0 bg-black/70 flex items-center justify-center z-50 p-4"
      onClick={onClose}
    >
      <div
        className="bg-bambu-dark-secondary rounded-xl border border-bambu-dark-tertiary w-full max-w-lg flex flex-col"
        onClick={(e) => e.stopPropagation()}
      >
        <div className="flex items-center justify-between px-6 py-4 border-b border-bambu-dark-tertiary">
          <div className="flex items-center gap-2 min-w-0">
            <Stethoscope className="w-5 h-5 text-bambu-green flex-shrink-0" />
            <h2 className="text-lg font-semibold text-white truncate">
              {t('camera.diagnose.modalTitle', { name: printerName || '' })}
            </h2>
          </div>
          <button
            onClick={onClose}
            className="text-bambu-gray hover:text-white transition-colors"
            title={t('common.close')}
          >
            <X className="w-5 h-5" />
          </button>
        </div>

        <div className="p-6 space-y-4">
          {diagnose.isPending && (
            <div className="flex items-center gap-2 text-bambu-gray">
              <Loader2 className="w-4 h-4 animate-spin" />
              <span>{t('camera.diagnose.running')}</span>
            </div>
          )}

          {diagnose.isError && (
            <div className="rounded-lg bg-red-50 dark:bg-red-500/10 border border-red-300 dark:border-red-500/30 px-4 py-3 text-sm text-red-700 dark:text-red-300">
              {t('camera.diagnose.runFailed', { error: (diagnose.error as Error).message })}
            </div>
          )}

          {result && (
            <>
              {/* Per-stage results */}
              <ol className="space-y-2">
                {result.stages.map((stage) => (
                  <li
                    key={stage.name}
                    className="flex items-center gap-3 bg-bambu-dark rounded-lg px-4 py-2.5"
                  >
                    <StageIcon status={stage.status} />
                    <div className="flex-1 min-w-0">
                      <div className="text-sm text-white">
                        {t(`camera.diagnose.stage.${stage.name}`)}
                      </div>
                      {stage.code && (
                        <div className="text-xs text-bambu-gray font-mono">{stage.code}</div>
                      )}
                    </div>
                    <div className="text-xs text-bambu-gray tabular-nums flex-shrink-0">
                      {stage.duration_ms} ms
                    </div>
                  </li>
                ))}
              </ol>

              {/* Summary + remediation */}
              <div
                className={
                  result.overall_status === 'ok'
                    ? 'rounded-lg bg-bambu-green/10 border border-bambu-green/30 px-4 py-3 text-sm text-bambu-green'
                    : 'rounded-lg bg-red-50 dark:bg-red-500/10 border border-red-300 dark:border-red-500/30 px-4 py-3 text-sm text-red-700 dark:text-red-300'
                }
              >
                {t(`camera.diagnose.summary.${result.summary_code}`, {
                  defaultValue: t('camera.diagnose.summary.unknown_failure'),
                })}
              </div>

              {/* Metadata for support triage */}
              <div className="text-xs text-bambu-gray space-y-0.5">
                <div>
                  <span className="text-bambu-gray/60">{t('camera.diagnose.meta.protocol')}: </span>
                  <span className="font-mono">{result.protocol}</span>
                  {' • '}
                  <span className="text-bambu-gray/60">{t('camera.diagnose.meta.port')}: </span>
                  <span className="font-mono">{result.port}</span>
                  {' • '}
                  <span className="text-bambu-gray/60">{t('camera.diagnose.meta.profile')}: </span>
                  <span className="font-mono">{result.profile}</span>
                </div>
              </div>
            </>
          )}
        </div>

        <div className="px-6 py-4 border-t border-bambu-dark-tertiary flex justify-end gap-2">
          <button
            onClick={() => diagnose.mutate()}
            disabled={diagnose.isPending}
            className="px-4 py-2 bg-bambu-dark hover:bg-bambu-dark-tertiary disabled:opacity-50 text-white text-sm rounded-lg transition-colors"
          >
            {t('camera.diagnose.retry')}
          </button>
          <button
            onClick={onClose}
            className="px-4 py-2 bg-bambu-green hover:bg-bambu-green/90 text-white text-sm rounded-lg transition-colors"
          >
            {t('common.close')}
          </button>
        </div>
      </div>
    </div>
  );
}