import {z} from 'zod'

export type GridpointForecastUnits = 'us' | 'si';

export type GetApiGridpointsWfoXYForecastArgs = {'Feature-Flags'?: (Array<'forecast_temperature_qv' | 'forecast_wind_speed_qv'>) | undefined, units?: GridpointForecastUnits | undefined};

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

export const jsonLdContext = z.union([z.array(z.unknown()), z.object({})]);

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

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

export const geoJsonLineString = z.array(geoJsonCoordinate);

export const geoJsonPolygon = z.array(z.array(geoJsonCoordinate));

export const geoJsonGeometry = z.union([z.object({type: z.literal("Point"), coordinates: geoJsonCoordinate, bbox: geoJsonBoundingBox.optional()}), z.object({type: z.literal("LineString"), coordinates: geoJsonLineString, bbox: geoJsonBoundingBox.optional()}), z.object({type: z.literal("Polygon"), coordinates: geoJsonPolygon, bbox: geoJsonBoundingBox.optional()}), z.object({type: z.literal("MultiPoint"), coordinates: z.array(geoJsonCoordinate), bbox: geoJsonBoundingBox.optional()}), z.object({type: z.literal("MultiLineString"), coordinates: z.array(geoJsonLineString), bbox: geoJsonBoundingBox.optional()}), z.object({type: z.literal("MultiPolygon"), coordinates: z.array(geoJsonPolygon), bbox: geoJsonBoundingBox.optional()})]).nullable();

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

export const gridpointForecastUnits = z.enum(["us", "si"]);

export const iSO8601Interval = z.union([z.string(), z.string(), z.string()]);

export const unitOfMeasure = z.string();

export const quantitativeValue = z.object({value: z.number().nullable().optional(), maxValue: z.number().optional(), minValue: z.number().optional(), unitCode: unitOfMeasure.optional(), qualityControl: z.enum(["Z", "C", "S", "V", "X", "Q", "G", "B", "T"]).optional()});

export const gridpoint12hForecastPeriod = z.object({number: z.number().int().gte(1).optional(), name: z.string().optional(), startTime: z.string().optional(), endTime: z.string().optional(), isDaytime: z.boolean().optional(), temperature: z.union([quantitativeValue, z.number().int()]).optional(), temperatureUnit: z.enum(["F", "C"]).optional(), temperatureTrend: z.enum(["rising", "falling"]).nullable().optional(), probabilityOfPrecipitation: quantitativeValue.optional(), windSpeed: z.union([quantitativeValue, z.string()]).optional(), windGust: z.union([quantitativeValue, z.string()]).nullable().optional(), windDirection: z.enum(["N", "NNE", "NE", "ENE", "E", "ESE", "SE", "SSE", "S", "SSW", "SW", "WSW", "W", "WNW", "NW", "NNW"]).optional(), icon: z.string().optional(), shortForecast: z.string().optional(), detailedForecast: z.string().optional()});

export const gridpoint12hForecastGeoJson = z.object({"@context": jsonLdContext.optional(), id: z.string().optional(), type: z.literal("Feature"), geometry: geoJsonGeometry, properties: z.object({"@context": jsonLdContext.optional(), geometry: geometryString.optional(), units: gridpointForecastUnits.optional(), forecastGenerator: z.string().optional(), generatedAt: z.string().optional(), updateTime: z.string().optional(), validTimes: iSO8601Interval.optional(), elevation: quantitativeValue.optional(), periods: z.array(gridpoint12hForecastPeriod).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
};

/**
 * Returns a textual forecast for a 2.5km grid area
 * 
 * GET /gridpoints/{wfo}/{x},{y}/forecast
 * 
 * Also accepts auth: apiKeyAuth
 */
export const getApiGridpointsWfoXYForecast = async (args: GetApiGridpointsWfoXYForecastArgs, options?: GetApiGridpointsWfoXYForecastOptions) => {
const {baseUrl = "https://api.weather.gov", fetch: fetchFn = fetch, userAgent} = options ?? {}

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

if (args['Feature-Flags'] != null) headers.set("Feature-Flags", args['Feature-Flags'].join(','))
if (args.units != null) query.append("units", String(args.units))
if (userAgent !== undefined) headers.set("User-Agent", userAgent)

const url = `${baseUrl.replace(/\/+$/, '')}/gridpoints/${encodeURIComponent(String(args.wfo))}/${encodeURIComponent(String(args.x))},${encodeURIComponent(String(args.y))}/forecast${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(gridpoint12hForecastGeoJson, await res.json())
};