/**
 * Nur Medien, die noch nicht im Fließtext eingebettet sind — ohne Doppel-Darstellung.
 */
import React, { useMemo, useState } from 'react'
import ExerciseMediaEmbed from './ExerciseMediaEmbed'
import ExerciseMediaThumbTile from './ExerciseMediaThumbTile'
import ReportContentModal from './ReportContentModal'
import { resolveExerciseMediaFileUrl } from '../utils/exerciseMediaUrl'
import {
  collectInlineExerciseMediaIdsFromExercise,
} from '../utils/exerciseInlineMediaRefs'

function isTrashHidden(m) {
  return String(m?.asset_lifecycle_state || 'active').toLowerCase() === 'trash_hidden'
}

export default function ExerciseAttachmentMediaStrip({ exerciseId, exercise }) {
  const [preview, setPreview] = useState(null)
  const [reportTarget, setReportTarget] = useState(null)
  const inlineIds = useMemo(() => collectInlineExerciseMediaIdsFromExercise(exercise), [exercise])

  const orphans = useMemo(() => {
    const list = (exercise?.media || []).filter((m) => m && !isTrashHidden(m))
    return list.filter((m) => !inlineIds.has(Number(m.id)))
  }, [exercise, inlineIds])

  if (!orphans.length || exerciseId == null) return null

  return (
    <section className="card exercise-detail-section exercise-attachment-media-strip">
      <h2>Angehängte Medien</h2>
      <p style={{ marginTop: '6px', color: 'var(--text2)', fontSize: '0.88rem' }}>
        Hier erscheinen nur Verknüpfungen, die noch nicht im Fließtext eingebettet sind (reine Material-Anhänge).
      </p>
      <div className="exercise-orphan-media-grid">
        {orphans.map((m) => {
          const lc = String(m.asset_lifecycle_state || 'active').toLowerCase()
          const caption = (m.title || '').trim() || (m.original_filename || '').trim() || `Medium #${m.id}`
          return (
            <article key={m.id} className="exercise-orphan-media-card">
              <div className="exercise-orphan-media-card__head">
                <ExerciseMediaThumbTile
                  exerciseId={exerciseId}
                  media={m}
                  onOpenPreview={setPreview}
                  size={88}
                />
                <div className="exercise-orphan-media-card__meta">
                  <strong className="exercise-orphan-media-card__title">{caption}</strong>
                  <span className="exercise-orphan-media-card__sub">
                    #{m.id}
                    {m.embed_platform ? ` · ${m.embed_platform}` : ''}
                    {m.media_type ? ` · ${m.media_type}` : ''}
                  </span>
                  {lc === 'trash_soft' && (
                    <span className="exercise-orphan-media-card__warn">Papierkorb (Stufe 1)</span>
                  )}
                </div>
              </div>
              <ExerciseMediaEmbed exerciseId={exerciseId} media={m} layoutSize="medium" />
              {(m.asset_lifecycle_state || 'active') === 'active' && !m.asset_legal_hold_active && (
                <button
                  type="button"
                  onClick={() => setReportTarget(m)}
                  style={{
                    background: 'none',
                    border: 'none',
                    padding: '4px 0 0',
                    cursor: 'pointer',
                    fontSize: '0.72rem',
                    color: 'var(--text3)',
                    textDecoration: 'underline',
                    textAlign: 'left',
                  }}
                >
                  Inhalt melden
                </button>
              )}
            </article>
          )
        })}
      </div>
      {reportTarget && (
        <ReportContentModal
          targetType="media_asset"
          targetId={reportTarget.media_asset_id || reportTarget.id}
          targetLabel={reportTarget.title || reportTarget.original_filename || `Medium #${reportTarget.id}`}
          onClose={() => setReportTarget(null)}
        />
      )}

      {preview && (
        <div
          role="dialog"
          aria-modal="true"
          aria-label="Medienvorschau"
          style={{
            position: 'fixed',
            inset: 0,
            background: 'rgba(0,0,0,0.55)',
            zIndex: 1001,
            overflow: 'auto',
            padding: '16px',
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'center',
          }}
          onClick={() => setPreview(null)}
          onKeyDown={(e) => e.key === 'Escape' && setPreview(null)}
        >
          <div
            className="card"
            style={{ maxWidth: 720, width: '100%', maxHeight: '90vh', overflow: 'auto' }}
            onClick={(e) => e.stopPropagation()}
          >
            <h3 style={{ marginTop: 0, fontSize: '1.05rem' }}>Vorschau</h3>
            {preview.embed_url ? (
              <p style={{ fontSize: '14px', wordBreak: 'break-all' }}>
                <a href={preview.embed_url} target="_blank" rel="noreferrer">
                  {preview.embed_url}
                </a>
              </p>
            ) : preview.mime_type?.startsWith('video/') || preview.media_type === 'video' ? (
              <video
                src={resolveExerciseMediaFileUrl(exerciseId, preview)}
                controls
                style={{ width: '100%', borderRadius: '8px', maxHeight: '70vh' }}
              />
            ) : preview.mime_type?.startsWith('image/') || preview.media_type === 'image' ? (
              <img
                alt=""
                src={resolveExerciseMediaFileUrl(exerciseId, preview)}
                style={{ maxWidth: '100%', borderRadius: '8px', maxHeight: '70vh', objectFit: 'contain' }}
              />
            ) : (
              <p style={{ fontSize: '14px' }}>
                <a href={resolveExerciseMediaFileUrl(exerciseId, preview)} target="_blank" rel="noreferrer">
                  Datei öffnen
                </a>
              </p>
            )}
            <div style={{ marginTop: '16px' }}>
              <button type="button" className="btn btn-secondary" onClick={() => setPreview(null)}>
                Schließen
              </button>
            </div>
          </div>
        </div>
      )}
    </section>
  )
}