import {z} from 'zod'

export type GetApiAstrologyPanchangArgs = {ayanamsa: number, coordinates: string, datetime: string, la?: string | undefined};

export type GetApiAstrologyPanchangOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const lord = z.object({id: z.number().int(), name: z.string(), vedic_name: z.string()});

export const nakshatraTiming = z.object({id: z.number().int(), name: z.string(), lord: lord, start: z.string(), end: z.string()});

export const tithiTiming = z.object({id: z.number().int(), index: z.number().int(), name: z.string(), paksha: z.string(), start: z.string(), end: z.string()});

export const karanaTiming = z.object({index: z.number().int(), id: z.number().int(), name: z.string(), start: z.string(), end: z.string()});

export const yogaTiming = z.object({id: z.number().int(), name: z.string(), start: z.string(), end: z.string()});

export const panchang = z.object({vaara: z.string(), nakshatra: z.array(nakshatraTiming), tithi: z.array(tithiTiming), karana: z.array(karanaTiming), yoga: z.array(yogaTiming), sunrise: z.string(), sunset: z.string(), moonrise: z.string(), moonset: z.string()});

export const panchangResponse = z.object({status: z.string(), data: panchang});

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
};

/**
 * Panchang
 * 
 * GET /astrology/panchang
 */
export const getApiAstrologyPanchang = async (args: GetApiAstrologyPanchangArgs, options?: GetApiAstrologyPanchangOptions) => {
const {baseUrl = "https://api.prokerala.com/v2", fetch: fetchFn = fetch, oauth2} = options ?? {}

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

if (args.ayanamsa != null) query.append("ayanamsa", String(args.ayanamsa))
if (args.coordinates != null) query.append("coordinates", String(args.coordinates))
if (args.datetime != null) query.append("datetime", String(args.datetime))
if (args.la != null) query.append("la", String(args.la))
if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/astrology/panchang${query.size > 0 ? `?${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(panchangResponse, await res.json())
};