import {z} from 'zod'

export type GetApiV1ProtocolStateArgs = {granularity?: ('5m' | '1h' | '1d') | undefined, days?: number | undefined, from?: string | undefined, to?: string | undefined};

export type GetApiV1ProtocolStateOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const date = z.string();

export const decimal = z.string();

export const protocolState = z.object({since: date, until: date, granularity: z.enum(["5m", "1h", "1d"]), series: z.array(z.object({ts: z.string(), markets: z.array(z.object({market: z.string(), collateralRatio: decimal.optional(), levercoinLeverage: decimal.optional(), stablecoinNav: decimal.optional(), levercoinNav: decimal.optional(), virtualStablecoinSupply: decimal.optional(), levercoinSupply: decimal.optional(), totalCollateral: decimal.optional(), collateralPriceUsd: decimal.optional(), tvlUsd: decimal.optional()})), usdcPeg: z.object({vaultReserves: decimal.optional(), virtualStablecoinSupply: decimal.optional()}).optional(), earnPool: z.object({hyusdPoolBalance: decimal.optional(), ehyusdSupply: decimal.optional(), ehyusdNav: decimal.optional(), effectiveApy: decimal.optional(), projectedApy: decimal.optional()}).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
};

/**
 * State history
 * 
 * GET /v1/protocol/state
 */
export const getApiV1ProtocolState = async (args: GetApiV1ProtocolStateArgs, options?: GetApiV1ProtocolStateOptions) => {
const {baseUrl = "https://api.hylo.so", fetch: fetchFn = fetch} = options ?? {}

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

if (args.granularity != null) query.append("granularity", String(args.granularity))
if (args.days != null) query.append("days", String(args.days))
if (args.from != null) query.append("from", String(args.from))
if (args.to != null) query.append("to", String(args.to))

const url = `${baseUrl.replace(/\/+$/, '')}/v1/protocol/state${query.size > 0 ? `?${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(protocolState, await res.json())
};