import {z} from 'zod'

export type Bbox = Array<number>;

export type GeoJsonPoint = {type: 'Point', coordinates: Array<number>};

export type GeoJsonLineString = {type: 'LineString', coordinates: Array<Array<number>>};

export type GeoJsonPolygon = {type: 'Polygon', coordinates: Array<Array<Array<number>>>};

export type GeoJsonMultiPoint = {type: 'MultiPoint', coordinates: Array<Array<number>>};

export type GeoJsonMultiLineString = {type: 'MultiLineString', coordinates: Array<Array<Array<number>>>};

export type GeoJsonMultiPolygon = {type: 'MultiPolygon', coordinates: Array<Array<Array<Array<number>>>>};

export type IntersectsFilter = {intersects?: (GeoJsonPoint | GeoJsonLineString | GeoJsonPolygon | GeoJsonMultiPoint | GeoJsonMultiLineString | GeoJsonMultiPolygon) | undefined};

export type DatetimeQuery = string;

export type Limit = number;

export type Ids = Array<string>;

export type CollectionsArray = Array<string>;

export type GetApiSearchArgs = {bbox?: Bbox | undefined, intersects?: IntersectsFilter | undefined, datetime?: DatetimeQuery | undefined, limit?: Limit | undefined, ids?: Ids | undefined, collections?: CollectionsArray | undefined, sortby?: string | undefined};

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

export const itemId = z.string();

export const link = z.object({href: z.string(), rel: z.string(), title: z.string().optional(), type: z.string().optional(), method: z.enum(["GET", "POST"]).optional(), hreflang: z.string().optional()});

export const assetType = z.string();

export const title = z.string().min(1).max(255);

export const description = z.string();

export const href = z.string();

export const checksumMultihashReadOnly = z.string();

export const roles = z.array(z.enum(["data", "overview", "thumbnail", "metadata"]));

export const geoadminVariant = z.string();

export const geoadminLang = z.enum(["de", "it", "fr", "rm", "en"]);

export const projEpsg = z.number().int();

export const eoGsd = z.number();

export const created = z.string();

export const updated = z.string();

export const itemAssets = z.record(z.string(), z.object({type: assetType, title: title.optional(), description: description.optional(), href: href.optional(), "file:checksum": checksumMultihashReadOnly.optional(), roles: roles.optional(), "geoadmin:variant": geoadminVariant.optional(), "geoadmin:lang": geoadminLang.optional(), "proj:epsg": projEpsg.optional(), gsd: eoGsd.optional(), created: created, updated: updated}));

export const bbox = z.array(z.number());

export const geoJsonPoint = z.object({type: z.literal("Point"), coordinates: z.array(z.number())});

export const geoJsonLineString = z.object({type: z.literal("LineString"), coordinates: z.array(z.array(z.number()))});

export const geoJsonPolygon = z.object({type: z.literal("Polygon"), coordinates: z.array(z.array(z.array(z.number())))});

export const geoJsonMultiPoint = z.object({type: z.literal("MultiPoint"), coordinates: z.array(z.array(z.number()))});

export const geoJsonMultiLineString = z.object({type: z.literal("MultiLineString"), coordinates: z.array(z.array(z.array(z.number())))});

export const geoJsonMultiPolygon = z.object({type: z.literal("MultiPolygon"), coordinates: z.array(z.array(z.array(z.array(z.number()))))});

export const itemGeometry = z.union([geoJsonPoint, geoJsonLineString, geoJsonPolygon, geoJsonMultiPoint, geoJsonMultiLineString, geoJsonMultiPolygon]);

export const datetime = z.string();

export const featureTitle = z.string().min(1).max(255);

export const duration = z.string();

export const forecastVariable = z.string().nullable();

export const forecastPerturbed = z.boolean().nullable();

export const cfStandardName = z.string().nullable();

export const unit = z.string().nullable();

export const itemProperties = z.union([z.object({created: created, updated: updated, datetime: datetime.optional(), start_datetime: datetime.optional(), end_datetime: datetime.optional(), title: featureTitle.optional()}), z.object({expires: datetime.optional()}), z.object({"forecast:reference_datetime": datetime, "forecast:horizon": duration.optional(), "forecast:duration": duration.optional(), "forecast:variable": forecastVariable.optional(), "forecast:perturbed": forecastPerturbed.optional()}), z.object({"cf:standard_name": cfStandardName.optional(), unit: unit.optional()})]);

export const stacVersion = z.string();

export const stacExtensions = z.array(z.enum(["https://stac-extensions.github.io/timestamps/v1.1.0/schema.json", "https://stac-extensions.github.io/forecast/v0.2.0/schema.json"]));

export const itemType = z.literal("Feature");

export const item = z.object({id: itemId, links: z.array(link), assets: itemAssets, bbox: bbox, geometry: itemGeometry, properties: itemProperties, stac_version: stacVersion, stac_extensions: stacExtensions.optional(), type: itemType});

export const itemsSearchLinks = z.array(link);

export const itemsSearchGet = z.object({features: z.array(item), type: z.literal("FeatureCollection"), links: itemsSearchLinks.optional()});

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
};

/**
 * Search STAC items with simple filtering.
 * 
 * GET /search
 */
export const getApiSearch = async (args: GetApiSearchArgs, options?: GetApiSearchOptions) => {
const {baseUrl = "https://data.geo.admin.ch/api/stac/v1", fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args.bbox != null) query.append("bbox", args.bbox.join(','))
if (args.intersects != null) query.append("intersects", JSON.stringify(args.intersects))
if (args.datetime != null) query.append("datetime", String(args.datetime))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.ids != null) query.append("ids", args.ids.join(','))
if (args.collections != null) query.append("collections", args.collections.join(','))
if (args.sortby != null) query.append("sortby", String(args.sortby))

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

const res = await fetchFn(url, {method: "GET", headers})

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

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