import type { AreaRead, DatasetCreateResponse, ExportRead, ProjectRead, QualityCheckRead } from '../types'

interface StatusItem {
  key: string
  label: string
  value: string
  detail: string
  state: 'ready' | 'warning' | 'waiting'
}

interface WorkbenchStatusStripProps {
  selectedProject: ProjectRead | null
  areas: AreaRead[]
  datasets: DatasetCreateResponse[]
  qualityChecks: QualityCheckRead[]
  exports: ExportRead[]
  activeLayerFeatureCount: number
  selectedAreaHasGeometry: boolean
}

function countByDatasetType(datasets: DatasetCreateResponse[], datasetType: string): number {
  return datasets.filter((dataset) => dataset.dataset_type === datasetType).length
}

function countReferenceDatasets(datasets: DatasetCreateResponse[]): number {
  return datasets.filter((dataset) => dataset.dataset_role === 'reference').length
}

function nextAction(items: StatusItem[]): string {
  if (!items.some((item) => item.key === 'project' && item.state === 'ready')) {
    return 'Create or open a project.'
  }
  if (!items.some((item) => item.key === 'area' && item.state === 'ready')) {
    return 'Create an AOI or select an area with geometry.'
  }
  if (!items.some((item) => item.key === 'datasets' && item.state === 'ready')) {
    return 'Upload a vector or raster dataset, or load the offline demo workflow.'
  }
  if (!items.some((item) => item.key === 'qa' && item.state === 'ready')) {
    return 'Run QA/QC against a reference dataset when candidate and reference data are available.'
  }
  if (!items.some((item) => item.key === 'exports' && item.state === 'ready')) {
    return 'Create a metadata, report or GeoJSON export for handoff.'
  }
  return 'Workbench has the core V1 loop populated.'
}

export function WorkbenchStatusStrip({
  selectedProject,
  areas,
  datasets,
  qualityChecks,
  exports,
  activeLayerFeatureCount,
  selectedAreaHasGeometry,
}: WorkbenchStatusStripProps): JSX.Element {
  const readyDatasets = datasets.filter((dataset) => dataset.status === 'ready').length
  const vectorDatasets = countByDatasetType(datasets, 'vector') + countByDatasetType(datasets, 'geojson')
  const rasterDatasets = countByDatasetType(datasets, 'raster')
  const referenceDatasets = countReferenceDatasets(datasets)
  const latestQualityCheck = qualityChecks[0]
  const latestExport = exports[0]

  const items: StatusItem[] = [
    {
      key: 'project',
      label: 'Project',
      value: selectedProject ? selectedProject.name : 'No project',
      detail: selectedProject ? selectedProject.region : 'Open or create a project',
      state: selectedProject ? 'ready' : 'waiting',
    },
    {
      key: 'area',
      label: 'AOI',
      value: `${areas.length} area${areas.length === 1 ? '' : 's'}`,
      detail: selectedAreaHasGeometry ? 'selected area has map geometry' : 'no selected map geometry',
      state: selectedAreaHasGeometry ? 'ready' : areas.length > 0 ? 'warning' : 'waiting',
    },
    {
      key: 'datasets',
      label: 'Datasets',
      value: `${readyDatasets}/${datasets.length} ready`,
      detail: `${vectorDatasets} vector, ${rasterDatasets} raster, ${referenceDatasets} reference`,
      state: datasets.length === 0 ? 'waiting' : readyDatasets === datasets.length ? 'ready' : 'warning',
    },
    {
      key: 'map',
      label: 'Map',
      value: `${activeLayerFeatureCount} feature${activeLayerFeatureCount === 1 ? '' : 's'}`,
      detail: selectedAreaHasGeometry ? 'AOI overlay available' : 'AOI overlay missing',
      state: selectedAreaHasGeometry || activeLayerFeatureCount > 0 ? 'ready' : 'waiting',
    },
    {
      key: 'qa',
      label: 'QA/QC',
      value: `${qualityChecks.length} check${qualityChecks.length === 1 ? '' : 's'}`,
      detail: latestQualityCheck ? `${latestQualityCheck.check_type}: ${latestQualityCheck.status}` : 'no persisted QA/QC result',
      state: qualityChecks.length > 0 ? 'ready' : 'waiting',
    },
    {
      key: 'exports',
      label: 'Exports',
      value: `${exports.length} export${exports.length === 1 ? '' : 's'}`,
      detail: latestExport ? `${latestExport.export_type}: ${latestExport.status}` : 'no handoff artifact yet',
      state: exports.length > 0 ? 'ready' : 'waiting',
    },
  ]
  const readyCount = items.filter((item) => item.state === 'ready').length

  return (
    <section className="workbench-status-strip" aria-label="Workbench readiness">
      <div className="status-strip-header">
        <div>
          <p className="eyebrow">V1 readiness</p>
          <h2>
            <span className="sr-only">Workbench status: </span>
            {readyCount === items.length ? 'Mol workbench is ready' : 'Mol workbench needs attention'}
          </h2>
          <p className="status-next-action">{nextAction(items)}</p>
        </div>
        <div className="status-readiness" aria-label={`${readyCount} of ${items.length} workbench stages ready`}>
          <strong>{readyCount}/{items.length}</strong>
          <span>stages ready</span>
        </div>
      </div>
      <div className="status-strip-grid">
        {items.map((item) => (
          <div className={`status-tile status-tile-${item.state}`} key={item.key}>
            <div className="status-tile-topline">
              <span>{item.label}</span>
              <span className="status-pill">{item.state}</span>
            </div>
            <strong title={item.value}>{item.value}</strong>
            <p>{item.detail}</p>
          </div>
        ))}
      </div>
    </section>
  )
}