import { useState } from 'react'
import { datasetsApi } from '../../services/api'
import type { BathymetrySourceProbeRead, DatasetCreateResponse } from '../../types'
import { getDatasetSourceDisplayName } from '../../lib/datasetDisplay'
import {
  OFFICIAL_SOURCE_PORTFOLIO,
  SOURCE_DOMAINS,
  operationalSources,
  sourcesForDomain,
  type SourcePriority,
} from '../../lib/sourcePortfolio'

interface SourceCatalogPanelProps {
  datasets: DatasetCreateResponse[]
  projectId?: string
}

const THEME_LABELS: Record<string, string> = {
  buildings: 'Bebouwing',
  population: 'Bevolking',
  forest: 'Bos',
  nature_value: 'Natuurwaarde',
  agriculture: 'Landbouw',
  water: 'Water',
  bathymetry: 'Waterbodem en dwarsprofielen',
  flood_hazard: 'Overstromingsgevaar',
  elevation: 'Hoogte en reliëf',
  roads: 'Wegen en transport',
  parcels: 'Percelen',
}

function datasetTheme(dataset: DatasetCreateResponse): string | null {
  const configured = String(dataset.source_metadata?.['theme'] ?? dataset.reference_layer_name ?? '').toLowerCase()
  if (configured === 'built' || configured === 'building') return 'buildings'
  if (configured === 'transport' || configured === 'road') return 'roads'
  if (configured in THEME_LABELS) return configured
  return null
}

function priorityLabel(priority: SourcePriority): string {
  if (priority === 'next') return 'Eerstvolgend'
  if (priority === 'planned') return 'Daarna'
  return 'Later'
}

function timelineSummary(
  temporalCount: number,
  temporalSeriesCount: number,
  otherMethodCount: number,
  firstYear: number | null,
  lastYear: number | null,
): string {
  if (temporalCount < 2 || !firstYear || !lastYear) {
    return 'Alleen de huidige toestand is vergelijkbaar beschikbaar.'
  }
  const seriesNote = temporalSeriesCount > 1
    ? ` in ${temporalSeriesCount} afzonderlijke reeksen`
    : ''
  const methodNote = otherMethodCount > 0
    ? `plus ${otherMethodCount} andere bronmethode${otherMethodCount === 1 ? '' : 'n'}`
    : null
  return [
    `${temporalCount} vergelijkbare meetmomenten${seriesNote}`,
    `${firstYear}-${lastYear}`,
    methodNote,
  ].filter(Boolean).join(' · ')
}

function mdkStatusLabel(status: BathymetrySourceProbeRead['status']): string {
  if (status === 'reachable') return 'Service bereikbaar'
  if (status === 'tls_error') return 'Geblokkeerd: certificaat'
  if (status === 'endpoint_unavailable') return 'Service niet bereikbaar'
  if (status === 'invalid_capabilities') return 'Ongeldige service-informatie'
  if (status === 'disabled') return 'Controle uitgeschakeld'
  return 'Configuratie controleren'
}

export function SourceCatalogPanel({ datasets, projectId }: SourceCatalogPanelProps): JSX.Element {
  const [mdkProbe, setMdkProbe] = useState<BathymetrySourceProbeRead | null>(null)
  const [mdkProbeLoading, setMdkProbeLoading] = useState(false)
  const [mdkProbeError, setMdkProbeError] = useState<string | null>(null)
  const ready = datasets.filter((dataset) => dataset.status === 'ready')
  const waterinfoDatasets = ready.filter((dataset) => dataset.source_name === 'waterinfo')
  const historicalOrthophotos = ready.filter(
    (dataset) =>
      dataset.source_name === 'digitaal_vlaanderen_orthophoto' &&
      String(dataset.source_metadata?.['product_key'] ?? 'most_recent') !== 'most_recent',
  )
  const bwkDatasets = ready.filter((dataset) => dataset.source_name === 'inbo_bwk_natura2000')
  const largestBwkSnapshot = bwkDatasets.reduce<DatasetCreateResponse | null>(
    (largest, dataset) => !largest || (dataset.feature_count ?? 0) > (largest.feature_count ?? 0) ? dataset : largest,
    null,
  )
  const agricultureDatasets = ready.filter((dataset) => dataset.source_name === 'agentschap_landbouw_zeevisserij_agricultural_parcels')
  const buildingsRegisterDatasets = ready.filter(
    (dataset) => dataset.source_name === 'digitaal_vlaanderen_buildings_addresses_register',
  )
  const dhmvDatasets = ready.filter((dataset) => dataset.source_name === 'digitaal_vlaanderen_dhmv')
  const floodHazardDatasets = ready.filter((dataset) => dataset.source_name === 'vmm_flood_hazard')
  const bathymetryProfileDatasets = ready.filter(
    (dataset) => dataset.source_name === 'vmm_vha_bathymetry_profiles',
  )
  const latestBuildingsRegister = [...buildingsRegisterDatasets].sort(
    (left, right) => new Date(right.observed_at ?? 0).getTime() - new Date(left.observed_at ?? 0).getTime(),
  )[0]
  const agricultureYears = agricultureDatasets
    .flatMap((dataset) => dataset.observed_at ? [new Date(dataset.observed_at).getUTCFullYear()] : [])
  const availableSources = operationalSources(ready)
  const availableSourceKeys = new Set(availableSources.map((source) => source.key))
  const pendingSources = OFFICIAL_SOURCE_PORTFOLIO.filter((source) => {
    if (source.key === 'bwk') return bwkDatasets.length === 0
    return !availableSourceKeys.has(source.key)
  })
  const domains = SOURCE_DOMAINS.map((domain) => {
    const sources = sourcesForDomain(domain.key)
    const loaded = sources.filter((source) => availableSourceKeys.has(source.key))
    const next = sources.filter((source) => source.priority === 'next' && !availableSourceKeys.has(source.key))
    return {
      ...domain,
      sourceCount: sources.length,
      loadedCount: loaded.length,
      nextCount: next.length,
      loadedNames: loaded.map((source) => source.name),
    }
  })
  const themes = Object.keys(THEME_LABELS).map((theme) => {
    const matches = ready.filter((dataset) => datasetTheme(dataset) === theme)
    const temporal = matches.filter((dataset) => dataset.temporal_series_key && dataset.observed_at)
    const seriesGroups = new Map<string, DatasetCreateResponse[]>()
    temporal.forEach((dataset) => {
      const seriesKey = dataset.temporal_series_key as string
      seriesGroups.set(seriesKey, [...(seriesGroups.get(seriesKey) ?? []), dataset])
    })
    const comparableSeries = [...seriesGroups.values()].filter((series) => series.length >= 2)
    const comparableObservations = comparableSeries.flat()
    const years = comparableObservations.map((dataset) => new Date(dataset.observed_at as string).getUTCFullYear())
    const latest = [...matches].sort(
      (left, right) => new Date(right.observed_at ?? right.imported_at ?? 0).getTime() - new Date(left.observed_at ?? left.imported_at ?? 0).getTime(),
    )[0]
    return {
      theme,
      label: THEME_LABELS[theme],
      datasetCount: matches.length,
      temporalCount: comparableObservations.length,
      temporalSeriesCount: comparableSeries.length,
      otherMethodCount: matches.length - comparableObservations.length,
      firstYear: years.length ? Math.min(...years) : null,
      lastYear: years.length ? Math.max(...years) : null,
      source: latest ? getDatasetSourceDisplayName(latest) : null,
    }
  })

  const checkMdkReadiness = async (): Promise<void> => {
    if (!projectId || mdkProbeLoading) return
    setMdkProbeLoading(true)
    setMdkProbeError(null)
    try {
      setMdkProbe(await datasetsApi.probeMdkBathymetry(projectId))
    } catch (error) {
      setMdkProbeError(error instanceof Error ? error.message : 'De Noordzee-bron kon niet worden gecontroleerd.')
    } finally {
      setMdkProbeLoading(false)
    }
  }

  return (
    <section className="workspace-panel source-catalog-panel" aria-label="Beschikbare databronnen">
      <div className="panel-title-row">
        <div>
          <span className="section-kicker">Broninventaris</span>
          <h2>Welke vragen kan GeoIntel beantwoorden?</h2>
          <p className="muted">Zes domeinen vormen samen het platform. Alleen werkelijk ingeladen bronnen krijgen de status operationeel; de rest blijft een transparante aansluitplanning.</p>
        </div>
        <span className="status-badge status-badge-ready">{availableSources.length} officiële bronnen operationeel</span>
      </div>

      <div className="source-domain-grid" aria-label="Platformbrede brondomeinen">
        {domains.map((domain) => (
          <article className="source-domain-card" key={domain.key}>
            <div>
              <strong>{domain.label}</strong>
              <span>{domain.loadedCount} van {domain.sourceCount} bronnen operationeel</span>
            </div>
            <b className={domain.loadedCount > 0 ? 'source-status-operational' : 'source-status-planned'}>
              {domain.loadedCount > 0 ? 'Operationeel' : 'Aansluiting nodig'}
            </b>
            <p>{domain.question}</p>
            <small>
              {domain.loadedNames.length > 0
                ? domain.loadedNames.slice(0, 2).join(' · ')
                : `${domain.nextCount} geverifieerde bron${domain.nextCount === 1 ? '' : 'nen'} eerstvolgend`}
            </small>
          </article>
        ))}
      </div>

      <details className="source-theme-coverage">
        <summary>Dekking per kaartthema en tijdreeks</summary>
        <div className="source-catalog-grid">
          {themes.map((theme) => (
            <article className="source-catalog-card" key={theme.theme}>
              <div>
                <strong>{theme.label}</strong>
                <span>{theme.source ?? 'Nog niet ingeladen'}</span>
              </div>
              <b>{theme.datasetCount > 0 ? 'Beschikbaar' : 'Ontbreekt'}</b>
              <p>{timelineSummary(
                theme.temporalCount,
                theme.temporalSeriesCount,
                theme.otherMethodCount,
                theme.firstYear,
                theme.lastYear,
              )}</p>
            </article>
          ))}
        </div>
      </details>

      {waterinfoDatasets.length > 0 || historicalOrthophotos.length > 0 || bwkDatasets.length > 0 || agricultureDatasets.length > 0 || buildingsRegisterDatasets.length > 0 || dhmvDatasets.length > 0 || floodHazardDatasets.length > 0 || bathymetryProfileDatasets.length > 0 ? (
        <details className="source-loaded-disclosure">
          <summary>Actieve broncollecties en hun beperkingen</summary>
          <div className="source-catalog-loaded" aria-label="Aanvullende ingeladen bronnen">
          {waterinfoDatasets.length > 0 ? (
            <article>
              <strong>Waterinfo meetreeksen</strong>
              <span>{new Set(waterinfoDatasets.map((dataset) => dataset.temporal_series_key).filter(Boolean)).size} stationsreeksen · {waterinfoDatasets.length} jaarmetingen</span>
              <p>Puntmetingen blijven afzonderlijk per station en worden niet als gebiedsgemiddelde of watervolume voorgesteld.</p>
            </article>
          ) : null}
          {historicalOrthophotos.length > 0 ? (
            <article>
              <strong>Historische luchtbeelden</strong>
              <span>{historicalOrthophotos.length} begrensde kaartselecties bewaard</span>
              <p>Officiële jaargangen en periodes zijn via de kaart beschikbaar zonder actuele GRB-validatie.</p>
            </article>
          ) : null}
          {bwkDatasets.length > 0 ? (
            <article>
              <strong>BWK / Natura 2000</strong>
              <span>
                Toestand 2025 · {bwkDatasets.length} gebiedsdekking{bwkDatasets.length === 1 ? '' : 'en'} ·{' '}
                {(largestBwkSnapshot?.feature_count ?? 0).toLocaleString('nl-BE')} kaartvlakken in de grootste dekking
              </span>
              <p>Biologische waardering en habitataandelen blijven afzonderlijke, brongetrouwe metingen met herkomstinformatie.</p>
            </article>
          ) : null}
          {agricultureDatasets.length > 0 ? (
            <article>
              <strong>Landbouwgebruikspercelen</strong>
              <span>{agricultureDatasets.length} definitieve jaargangen{agricultureYears.length ? ` · ${Math.min(...agricultureYears)}-${Math.max(...agricultureYears)}` : ''}</span>
              <p>Oppervlakte en officiële hoofdteeltgroepen zijn historisch vergelijkbaar; perceelidentiteiten blijven bewust niet gekoppeld tussen jaren.</p>
            </article>
          ) : null}
          {latestBuildingsRegister ? (
            <article>
              <strong>Gebouwen- en Adressenregister</strong>
              <span>
                {(latestBuildingsRegister.feature_count ?? 0).toLocaleString('nl-BE')} gebouwen · {' '}
                {Number(latestBuildingsRegister.source_metadata?.['building_unit_count'] ?? 0).toLocaleString('nl-BE')} eenheden · {' '}
                {Number(latestBuildingsRegister.source_metadata?.['linked_address_count'] ?? 0).toLocaleString('nl-BE')} gekoppelde adressen
              </span>
              <p>Registerstatus en geaggregeerde koppelingen voor Mol; adreslabels en persoonsgegevens worden niet in de kaartlaag getoond.</p>
            </article>
          ) : null}
          {dhmvDatasets.length > 0 ? (
            <article>
              <strong>Digitaal Hoogtemodel Vlaanderen II</strong>
              <span>{dhmvDatasets.length} rasterproducten · DTM/DSM · analyse op 5 m</span>
              <p>Hoogte in TAW, reliëf en helling uit opnameperiode 2013-2015. Geen waterdiepte of watervolume.</p>
            </article>
          ) : null}
          {floodHazardDatasets.length > 0 ? (
            <article>
              <strong>VMM-overstromingsgevaarkaarten</strong>
              <span>{floodHazardDatasets.length} scenario&apos;s · fluviaal en pluviaal · huidig en 2050</span>
              <p>Gemodelleerde maximumdiepte per kansscenario. Geen actuele waterstand, bathymetrie of permanent watervolume.</p>
            </article>
          ) : null}
          {bathymetryProfileDatasets.length > 0 ? (
            <article>
              <strong>VHA-dwarsprofielen waterbodem</strong>
              <span>
                {bathymetryProfileDatasets.reduce(
                  (total, dataset) => total + Number(dataset.feature_count ?? 0),
                  0,
                ).toLocaleString('nl-BE')} profielpunten · historische meetcampagnes
              </span>
              <p>Meetvelden en officiële profielbladen per punt. Geen continue actuele bathymetrie of volume zonder een gelijktijdig waterpeil.</p>
            </article>
          ) : null}
          </div>
        </details>
      ) : null}

      <details className="source-loaded-disclosure">
        <summary>Maritieme bronstatus</summary>
        <div className="source-catalog-loaded">
          <article>
            <strong>MDK-dieptemodel Belgische Noordzee</strong>
            <span>{mdkProbe ? mdkStatusLabel(mdkProbe.status) : 'Nog niet live gecontroleerd'}</span>
            <p>
              {mdkProbe?.message ??
                'Controleert uitsluitend de officiële service-informatie met geldige TLS. Er wordt geen raster gedownload.'}
            </p>
            {mdkProbeError ? <small className="error-text">{mdkProbeError}</small> : null}
            <button
              className="secondary-button"
              type="button"
              disabled={!projectId || mdkProbeLoading}
              onClick={() => void checkMdkReadiness()}
            >
              {mdkProbeLoading ? 'Controleren...' : 'Controleer Noordzee-bron'}
            </button>
          </article>
        </div>
      </details>

      <details className="source-opportunity-list">
        <summary>Officiële bronnen die hierna kunnen worden ingeladen</summary>
        <div className="source-opportunity-domains">
          {SOURCE_DOMAINS.map((domain) => {
            const sources = pendingSources.filter((source) => source.domain === domain.key)
            if (sources.length === 0) return null
            return (
              <section className="source-opportunity-domain" key={domain.key}>
                <header>
                  <strong>{domain.label}</strong>
                  <span>{sources.length} gecontroleerde kandidaatbron{sources.length === 1 ? '' : 'nen'}</span>
                </header>
                <div>
                  {sources.map((source) => (
                    <article key={source.name}>
                      <div>
                        <strong>{source.name}</strong>
                        <span>{source.owner} · {source.coverage}</span>
                      </div>
                      <span className={`source-priority source-priority-${source.priority}`}>{priorityLabel(source.priority)}</span>
                      <p>{source.value}</p>
                      <small>Meetbaar als: {source.metricExamples}</small>
                      <a href={source.url} target="_blank" rel="noreferrer">Bekijk officiële bron</a>
                    </article>
                  ))}
                </div>
              </section>
            )
          })}
        </div>
      </details>
    </section>
  )
}