import {z} from 'zod'

export type Position2D = Array<unknown>;

export type Position3D = Array<unknown>;

export type Polygon = {bbox?: (Array<unknown> | Array<unknown> | null) | undefined, type: 'Polygon', coordinates: Array<Array<Position2D | Position3D>>};

export type MultiPolygon = {bbox?: (Array<unknown> | Array<unknown> | null) | undefined, type: 'MultiPolygon', coordinates: Array<Array<Array<Position2D | Position3D>>>};

export type SamplingPointBodyParameters = Polygon | MultiPolygon | null;

export type CreateApiDataObservationArgs = {skip?: number | undefined, limit?: number | undefined, determinand?: (string | null) | undefined, samplingPurpose?: (string | null) | undefined, sampleSamplingNotation?: (number | null) | undefined, date?: (string | null) | undefined, dateFrom?: (string | null) | undefined, dateTo?: (string | null) | undefined, complianceOnly?: boolean | undefined, sampleMaterialType?: (string | null) | undefined, easting?: (number | null) | undefined, northing?: (number | null) | undefined, latitude?: (number | null) | undefined, longitude?: (number | null) | undefined, radius?: (number | null) | undefined, precannedArea?: (string | null) | undefined, pointNotation?: (string | null) | undefined, prefLabel?: (string | null) | undefined, region?: (string | null) | undefined, area?: (string | null) | undefined, subArea?: (string | null) | undefined, samplingPointStatus?: (string | null) | undefined, samplingPointType?: (string | null) | undefined, 'Accept-Crs'?: ('http://www.opengis.net/def/crs/EPSG/0/27700' | 'http://www.opengis.net/def/crs/EPSG/0/4326') | undefined, 'CSV-Header'?: ('present' | 'absent') | undefined, 'API-Version'?: string | undefined, body: SamplingPointBodyParameters};

export type CreateApiDataObservationOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const createApiDataObservationResponse = z.unknown();

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * List and filter observations (including for multiple sampling points)
 * 
 * POST /data/observation
 */
export const createApiDataObservation = async (args: CreateApiDataObservationArgs, options?: CreateApiDataObservationOptions) => {
const {baseUrl = "https://environment.data.gov.uk/water-quality", fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/ld+json")

if (args.skip != null) query.append("skip", String(args.skip))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.determinand != null) query.append("determinand", String(args.determinand))
if (args.samplingPurpose != null) query.append("samplingPurpose", String(args.samplingPurpose))
if (args.sampleSamplingNotation != null) query.append("sampleSamplingNotation", String(args.sampleSamplingNotation))
if (args.date != null) query.append("date", String(args.date))
if (args.dateFrom != null) query.append("dateFrom", String(args.dateFrom))
if (args.dateTo != null) query.append("dateTo", String(args.dateTo))
if (args.complianceOnly != null) query.append("complianceOnly", String(args.complianceOnly))
if (args.sampleMaterialType != null) query.append("sampleMaterialType", String(args.sampleMaterialType))
if (args.easting != null) query.append("easting", String(args.easting))
if (args.northing != null) query.append("northing", String(args.northing))
if (args.latitude != null) query.append("latitude", String(args.latitude))
if (args.longitude != null) query.append("longitude", String(args.longitude))
if (args.radius != null) query.append("radius", String(args.radius))
if (args.precannedArea != null) query.append("precannedArea", String(args.precannedArea))
if (args.pointNotation != null) query.append("pointNotation", String(args.pointNotation))
if (args.prefLabel != null) query.append("prefLabel", String(args.prefLabel))
if (args.region != null) query.append("region", String(args.region))
if (args.area != null) query.append("area", String(args.area))
if (args.subArea != null) query.append("subArea", String(args.subArea))
if (args.samplingPointStatus != null) query.append("samplingPointStatus", String(args.samplingPointStatus))
if (args.samplingPointType != null) query.append("samplingPointType", String(args.samplingPointType))
if (args['Accept-Crs'] != null) headers.set("Accept-Crs", String(args['Accept-Crs']))
if (args['CSV-Header'] != null) headers.set("CSV-Header", String(args['CSV-Header']))
if (args['API-Version'] != null) headers.set("API-Version", String(args['API-Version']))

const url = `${baseUrl.replace(/\/+$/, '')}/data/observation${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(createApiDataObservationResponse, await res.json())
};