import {z} from 'zod'

export type ISOEnum = 'CAISO' | 'ERCOT' | 'IESO' | 'ISONE' | 'MISO' | 'NYISO' | 'PJM' | 'SPP';

export type BlockPricingQueryParams = {start_date: string, end_date: string, location: string, market?: (string | null) | undefined, blocks?: (string | null) | undefined, day_so_far?: boolean | undefined};

export type GetApiBlockPricingIsoArgs = {iso: ISOEnum, params: BlockPricingQueryParams, api_key?: (string | null) | undefined, 'x-api-key'?: (string | null) | undefined};

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

export const blockPricingDatasets = z.object({da: z.string(), rt: z.string(), dart: z.string().nullable().optional()});

export const blockPricingDatum = z.object({market: z.string(), block: z.string(), value: z.number().nullable(), pct_change: z.number().nullable(), complete: z.boolean()});

export const blockPricingDateGroup = z.object({date: z.string(), is_nerc_holiday: z.boolean().optional(), data: z.array(blockPricingDatum)});

export const blockPricingResponse = z.object({dataset_metadata: blockPricingDatasets, data: z.array(blockPricingDateGroup)});

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 Block Pricing
 * 
 * GET /block-pricing/{iso}
 */
export const getApiBlockPricingIso = async (args: GetApiBlockPricingIsoArgs, options?: GetApiBlockPricingIsoOptions) => {
const {baseUrl = "https://api.gridstatus.io/v1", fetch: fetchFn = fetch} = options ?? {}

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

if (args.params != null) query.append("params", JSON.stringify(args.params))
if (args.api_key != null) query.append("api_key", String(args.api_key))
if (args['x-api-key'] != null) headers.set("x-api-key", String(args['x-api-key']))

const url = `${baseUrl.replace(/\/+$/, '')}/block-pricing/${encodeURIComponent(String(args.iso))}${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(blockPricingResponse, await res.json())
};