import { useEffect, useState } from 'react'
import { qaApi } from '../../services/api'
import type {
  DetectionEvidenceRole,
  DetectionReviewDecision,
  DetectionReviewList,
  DetectionReviewRead,
} from '../../types'
import { formatError } from '../../lib/formatError'

interface DetectionReviewPanelProps {
  projectId: string
  qualityCheckId: string
  reviewLocked?: boolean
  onOpenEvidenceMap?: (qualityCheckId: string) => void
}

const ROLE_LABELS: Record<DetectionEvidenceRole, string> = {
  false_positive: 'Onterecht gevonden',
  false_negative: 'Gemist gebouw',
}

const DECISION_LABELS: Record<DetectionReviewDecision, string> = {
  confirmed_model_false_positive: 'Bevestigde foutdetectie',
  confirmed_model_false_negative: 'Bevestigd gemist gebouw',
  reference_gap_or_change: 'Referentie ontbreekt of is verouderd',
  qa_alignment_mismatch: 'Vormvergelijking is te streng',
  imagery_obscured_or_uncertain: 'Luchtbeeld is onduidelijk',
  uncertain: 'Verder onderzoek nodig',
  unreviewed: 'Nog niet beoordeeld',
}

const ROLE_DECISIONS: Record<DetectionEvidenceRole, DetectionReviewDecision[]> = {
  false_positive: [
    'unreviewed',
    'confirmed_model_false_positive',
    'reference_gap_or_change',
    'qa_alignment_mismatch',
    'uncertain',
  ],
  false_negative: [
    'unreviewed',
    'confirmed_model_false_negative',
    'reference_gap_or_change',
    'qa_alignment_mismatch',
    'imagery_obscured_or_uncertain',
    'uncertain',
  ],
}

function shortId(value: string): string {
  return value.length > 18 ? `${value.slice(0, 8)}...${value.slice(-6)}` : value
}

function formatScore(value: number | null | undefined): string {
  return typeof value === 'number' && Number.isFinite(value) ? value.toFixed(3) : 'n.v.t.'
}

export function DetectionReviewPanel({
  projectId,
  qualityCheckId,
  reviewLocked = false,
  onOpenEvidenceMap,
}: DetectionReviewPanelProps): JSX.Element {
  const [queue, setQueue] = useState<DetectionReviewList | null>(null)
  const [loading, setLoading] = useState(false)
  const [savingKey, setSavingKey] = useState<string | null>(null)
  const [error, setError] = useState<string | null>(null)
  const [roleFilter, setRoleFilter] = useState<'all' | DetectionEvidenceRole>('all')
  const [statusFilter, setStatusFilter] = useState<'all' | 'reviewed' | 'unreviewed'>('unreviewed')
  const [offset, setOffset] = useState(0)
  const [draftDecisions, setDraftDecisions] = useState<Record<string, DetectionReviewDecision>>({})
  const [draftNotes, setDraftNotes] = useState<Record<string, string>>({})

  const load = async () => {
    setLoading(true)
    setError(null)
    try {
      const result = await qaApi.listDetectionReviews(projectId, qualityCheckId, {
        evidenceRole: roleFilter === 'all' ? undefined : roleFilter,
        reviewed: statusFilter === 'all' ? undefined : statusFilter === 'reviewed',
        limit: 50,
        offset,
      })
      setQueue(result)
      setDraftDecisions(Object.fromEntries(result.items.map((item) => [reviewKey(item), item.decision])))
      setDraftNotes(Object.fromEntries(result.items.map((item) => [reviewKey(item), item.notes ?? ''])))
    } catch (caught) {
      setError(formatError(caught, 'De controlelijst kon niet worden geladen'))
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load()
  }, [projectId, qualityCheckId, roleFilter, statusFilter, offset])

  const save = async (item: DetectionReviewRead) => {
    const key = reviewKey(item)
    setSavingKey(key)
    setError(null)
    try {
      await qaApi.upsertDetectionReview(projectId, qualityCheckId, {
        evidence_role: item.evidence_role,
        evidence_feature_id: item.evidence_feature_id,
        decision: draftDecisions[key] ?? item.decision,
        notes: draftNotes[key]?.trim() || null,
        reviewed_by: 'operator',
      })
      await load()
    } catch (caught) {
      setError(formatError(caught, 'De beoordeling kon niet worden bewaard'))
    } finally {
      setSavingKey(null)
    }
  }

  return (
    <section className="detection-review-panel" aria-label="Handmatige controle van beeldanalyse">
      <div className="panel-title-row">
        <div>
          <h3>{reviewLocked ? 'Beoordelingen bekijken' : 'Fouten controleren'}</h3>
          <p className="muted">
            {reviewLocked
              ? 'De demo toont het bestaande kwaliteitsbewijs zonder beoordelingen te wijzigen.'
              : 'Beoordeel alleen twijfelgevallen. Bevestigde fouten kunnen later veilig als trainingsfeedback worden gebruikt.'}
          </p>
        </div>
        <button type="button" className="secondary-action" onClick={() => onOpenEvidenceMap?.(qualityCheckId)}>
          Op kaart bekijken
        </button>
      </div>

      {queue ? (
        <div className="detection-review-summary">
          <div><span>Te beoordelen</span><strong>{queue.summary.total}</strong></div>
          <div><span>Afgerond</span><strong>{queue.summary.reviewed}</strong></div>
          <div><span>Resterend</span><strong>{queue.summary.remaining}</strong></div>
          <div><span>Fout gevonden</span><strong>{queue.summary.false_positive_total}</strong></div>
          <div><span>Gemist</span><strong>{queue.summary.false_negative_total}</strong></div>
        </div>
      ) : null}

      {queue?.summary.reviewed_metrics ? (
        <div className="detection-review-adjudicated" aria-label="Score na beoordeling">
          <div className="summary-grid">
            <div>
              <span>Precisie zoals gemeten</span>
              <strong>{formatScore(queue.summary.reviewed_metrics.raw.precision)}</strong>
            </div>
            <div>
              <span>Precisie na uw beoordeling</span>
              <strong>{formatScore(queue.summary.reviewed_metrics.adjudicated.precision)}</strong>
            </div>
            <div>
              <span>Herkenningsgraad na beoordeling</span>
              <strong>{formatScore(queue.summary.reviewed_metrics.adjudicated.recall)}</strong>
            </div>
          </div>
          <p className="geo-data-notice">
            {queue.summary.reviewed_metrics.review_complete
              ? `Alle bevindingen zijn beoordeeld. ${queue.summary.reviewed_metrics.false_positive_breakdown.exonerated} onterecht gevonden objecten en ${queue.summary.reviewed_metrics.false_negative_breakdown.exonerated} gemiste objecten bleken een hiaat in de referentielaag, niet een modelfout.`
              : `Nog ${queue.summary.reviewed_metrics.false_positive_breakdown.unreviewed + queue.summary.reviewed_metrics.false_negative_breakdown.unreviewed} bevindingen onbeoordeeld. De precisie ligt tussen ${formatScore(queue.summary.reviewed_metrics.pessimistic.precision)} en ${formatScore(queue.summary.reviewed_metrics.optimistic.precision)}; de getoonde waarde rekent elke onbeoordeelde bevinding nog als modelfout.`}
          </p>
        </div>
      ) : null}

      <div className="detection-review-filters">
        <label>
          Soort
          <select value={roleFilter} onChange={(event) => {
            setRoleFilter(event.target.value as typeof roleFilter)
            setOffset(0)
          }}>
            <option value="all">Alles</option>
            <option value="false_positive">Onterecht gevonden</option>
            <option value="false_negative">Gemist gebouw</option>
          </select>
        </label>
        <label>
          Status
          <select value={statusFilter} onChange={(event) => {
            setStatusFilter(event.target.value as typeof statusFilter)
            setOffset(0)
          }}>
            <option value="unreviewed">Nog te beoordelen</option>
            <option value="reviewed">Beoordeeld</option>
            <option value="all">Alles</option>
          </select>
        </label>
        <button type="button" className="secondary-action" disabled={loading} onClick={() => void load()}>
          {loading ? 'Laden...' : 'Vernieuwen'}
        </button>
      </div>

      {error ? <p className="error" role="alert">{error}</p> : null}
      {!loading && queue && queue.items.length === 0 ? (
        <div className="result-state result-state-empty">
          <strong>Geen objecten in deze selectie</strong>
          <p>Pas de filters aan of open de bewijslaag op de kaart.</p>
        </div>
      ) : null}

      <ol className="detection-review-list">
        {queue?.items?.map((item) => {
          const key = reviewKey(item)
          const decision = draftDecisions[key] ?? item.decision
          return (
            <li key={key} className="detection-review-item">
              <div className="detection-review-item-heading">
                <div>
                  <span>{ROLE_LABELS[item.evidence_role]}</span>
                  <strong>{item.class_name ?? 'gebouw'} / {shortId(item.evidence_feature_id)}</strong>
                </div>
                {typeof item.confidence === 'number' ? <span className="count-pill">{Math.round(item.confidence * 100)}% vertrouwen</span> : null}
              </div>
              <div className="detection-review-editor">
                <label>
                  Beoordeling
                  <select
                    value={decision}
                    disabled={reviewLocked}
                    onChange={(event) => setDraftDecisions((current) => ({
                      ...current,
                      [key]: event.target.value as DetectionReviewDecision,
                    }))}
                  >
                    {ROLE_DECISIONS[item.evidence_role].map((option) => (
                      <option key={option} value={option}>{DECISION_LABELS[option]}</option>
                    ))}
                  </select>
                </label>
                <label>
                  Notitie
                  <input
                    type="text"
                    maxLength={2000}
                    placeholder="Waarom is dit correct, fout of onzeker?"
                    value={draftNotes[key] ?? ''}
                    readOnly={reviewLocked}
                    onChange={(event) => setDraftNotes((current) => ({ ...current, [key]: event.target.value }))}
                  />
                </label>
                <button type="button" className="primary-action" disabled={reviewLocked || savingKey === key} onClick={() => void save(item)}>
                  {savingKey === key ? 'Bewaren...' : 'Beoordeling bewaren'}
                </button>
              </div>
            </li>
          )
        })}
      </ol>
      {queue && queue.total > queue.limit ? (
        <div className="detection-review-pagination" aria-label="Pagina's van de controlelijst">
          <button
            type="button"
            className="secondary-action"
            disabled={offset === 0 || loading}
            onClick={() => setOffset((current) => Math.max(current - queue.limit, 0))}
          >
            Vorige
          </button>
          <span>{offset + 1}-{Math.min(offset + queue.limit, queue.total)} van {queue.total}</span>
          <button
            type="button"
            className="secondary-action"
            disabled={offset + queue.limit >= queue.total || loading}
            onClick={() => setOffset((current) => current + queue.limit)}
          >
            Volgende
          </button>
        </div>
      ) : null}
    </section>
  )
}

function reviewKey(item: Pick<DetectionReviewRead, 'evidence_role' | 'evidence_feature_id'>): string {
  return `${item.evidence_role}:${item.evidence_feature_id}`
}