import {z} from 'zod'

export type V3Signals = 'co2_moer' | 'health_damage';

export type V3HistoricalSignals = 'co2_aoer';

export type GetApiV3MyAccessArgs = {region?: (string | null) | undefined, signal_type?: (V3Signals | unknown | V3HistoricalSignals | null) | undefined};

export type GetApiV3MyAccessOptions = {baseUrl?: string | undefined, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const v3Signals = z.enum(["co2_moer", "health_damage"]);

export const v3HistoricalSignals = z.literal("co2_aoer");

export const modelTypes = z.enum(["interchange", "average", "binned_regression", "heatrate", "proxy", "synthetic_proxy", "forecast", "synthetic_vre_potential"]);

export const hCHistoricalModel = z.object({model: z.string(), data_start: z.string(), data_end: z.string().nullable().optional(), train_start: z.string(), train_end: z.string(), type: modelTypes});

export const hCForecastModel = z.object({model: z.string(), data_start: z.string(), data_end: z.string().nullable().optional(), train_start: z.string(), train_end: z.string(), historical_model: z.string().nullable()});

export const hCEndpoint = z.object({endpoint: z.enum(["v3/forecast", "v3/historical"]), models: z.array(z.union([hCHistoricalModel, hCForecastModel]))});

export const hCRegion = z.object({region: z.string(), region_full_name: z.string(), parent: z.string().nullable().optional(), data_point_period_seconds: z.union([z.literal(3600), z.literal(300)]), endpoints: z.array(hCEndpoint)});

export const hCSignal = z.object({signal_type: z.union([v3Signals, v3HistoricalSignals, z.unknown()]), regions: z.array(hCRegion)});

export const pYHypercube = z.object({signal_types: z.array(hCSignal)});

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
};

/**
 * Get information about what your account can access
 * 
 * GET /v3/my-access
 */
export const getApiV3MyAccess = async (args: GetApiV3MyAccessArgs, options?: GetApiV3MyAccessOptions) => {
const {baseUrl = "https://api.watttime.org", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (args.region != null) query.append("region", String(args.region))
if (args.signal_type != null) query.append("signal_type", String(args.signal_type))
if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v3/my-access${query.size > 0 ? `?${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(pYHypercube, await res.json())
};