import { useEffect, useState } from 'react';
import { Alert, EmptyState, LoadingBlock, errorMessage } from '../../components/Feedback';
import {
  getAssetMediaBlob,
  getInspectionFindingEvidenceBlob,
  listInspectionActFieldMedia,
  listInspectionFindingEvidence,
  listInspectionFindings,
} from '../../lib/api';
import type { InspectionActFieldMedia, InspectionFinding, InspectionFindingEvidence } from '../../lib/api';
import { formatDate } from '../../lib/format';

type FindingWithPhotos = { finding: InspectionFinding; photos: InspectionFindingEvidence[] };

function Photo({ id, title, caption, load }: { id: string; title: string; caption: string; load: (id: string) => Promise<Blob> }) {
  const [url, setUrl] = useState('');
  useEffect(() => {
    let active = true;
    let objectUrl = '';
    load(id).then((blob) => {
      if (!active) return;
      objectUrl = URL.createObjectURL(blob);
      setUrl(objectUrl);
    }).catch(() => undefined);
    return () => { active = false; if (objectUrl) URL.revokeObjectURL(objectUrl); };
  }, [id, load]);
  return <figure className="act-finding-photo">
    {url ? <a href={url} target="_blank" rel="noopener noreferrer" aria-label={`Ver foto ${title}`}><img src={url} alt={title} /></a> : <span className="media-preview-loading">Cargando foto…</span>}
    <figcaption>{caption}</figcaption>
  </figure>;
}

function Finding({ item, assetPhotos }: { item: FindingWithPhotos; assetPhotos: InspectionActFieldMedia[] }) {
  const { finding, photos } = item;
  return <article className="act-finding-record">
    <div className="inspection-finding-heading"><div><span className="eyebrow">{finding.code}</span><h3>{finding.title}</h3><p>{finding.asset.name} · {finding.asset.code}</p></div></div>
    <p className="inspection-finding-description">{finding.description}</p>
    {finding.legalBasis && <p><strong>Normativa:</strong> {finding.legalBasis}</p>}
    {finding.severity != null && <p>Gravedad {finding.severity}/10</p>}
    {(photos.length > 0 || assetPhotos.length > 0) && <div className="act-finding-photos">
      {photos.map((photo) => <Photo key={photo.id} id={photo.id} title={photo.title || finding.title} caption={`Hallazgo · ${formatDate(photo.capturedAt || photo.createdAt)}${photo.latitude != null && photo.longitude != null ? ` · GPS ${photo.latitude.toFixed(6)}, ${photo.longitude.toFixed(6)}` : ''}`} load={getInspectionFindingEvidenceBlob} />)}
      {assetPhotos.map((photo) => <Photo key={photo.id} id={photo.id} title={photo.title || finding.asset.name} caption={`Inventario · ${formatDate(photo.fieldCapturedAt || photo.capturedAt || photo.createdAt)}`} load={getAssetMediaBlob} />)}
    </div>}
    {photos.length === 0 && assetPhotos.length === 0 && <small className="muted">Sin fotografías vinculadas.</small>}
  </article>;
}

export function InspectionActMediaPanel({ actId }: { actId: string }) {
  const [items, setItems] = useState<FindingWithPhotos[]>([]);
  const [assetPhotos, setAssetPhotos] = useState<InspectionActFieldMedia[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');
  useEffect(() => {
    let active = true;
    setLoading(true); setError('');
    Promise.all([listInspectionFindings(actId), listInspectionActFieldMedia(actId).catch(() => [])])
      .then(async ([findings, media]) => {
        const records = await Promise.all(findings.map(async (finding) => ({
          finding, photos: (await listInspectionFindingEvidence(finding.id)).filter((evidence) => evidence.kind === 'PHOTO' && evidence.purpose === 'OBSERVATION'),
        })));
        if (!active) return;
        setItems(records);
        setAssetPhotos(media.filter((photo) => photo.kind === 'PHOTO'));
      })
      .catch((requestError) => active && setError(errorMessage(requestError)))
      .finally(() => active && setLoading(false));
    return () => { active = false; };
  }, [actId]);
  const findingAssetIds = new Set(items.map((item) => item.finding.asset.id));
  const otherPhotos = assetPhotos.filter((photo) => !findingAssetIds.has(photo.assetId));
  return <section className="panel act-media-panel">
    <div className="panel-heading"><div><h2>Hallazgos del Acta</h2><p className="section-copy">Cada hallazgo reúne su descripción y las fotos tomadas en campo.</p></div><span className="count-pill">{items.length}</span></div>
    {error && <Alert>{error}</Alert>}
    {loading ? <LoadingBlock label="Cargando hallazgos y fotografías…" /> : items.length ?
      <div className="act-finding-list">{items.map((item) => <Finding key={item.finding.id} item={item} assetPhotos={assetPhotos.filter((photo) => photo.assetId === item.finding.asset.id)} />)}</div> :
      <EmptyState title="Sin hallazgos" text="Esta Acta no contiene hallazgos sincronizados." />}
    {!loading && otherPhotos.length > 0 && <div className="act-other-asset-photos"><h3>Fotos de otras instalaciones</h3><div className="act-finding-photos">{otherPhotos.map((photo) => <Photo key={photo.id} id={photo.id} title={photo.title || 'Instalación inspeccionada'} caption={`${photo.title || 'Instalación'} · ${formatDate(photo.fieldCapturedAt || photo.capturedAt || photo.createdAt)}`} load={getAssetMediaBlob} />)}</div></div>}
  </section>;
}