import {z} from 'zod'

export type GetApiV3PairsArgs = {causeVariableName?: string | undefined, effectVariableName?: string | undefined, causeVariableId?: number | undefined, effectVariableId?: number | undefined, predictorVariableName?: string | undefined, outcomeVariableName?: string | undefined, effectUnitName?: string | undefined, userId?: number | undefined, causeUnitName?: string | undefined, onsetDelay?: string | undefined, durationOfAction?: string | undefined, earliestMeasurementTime?: string | undefined, latestMeasurementTime?: string | undefined, limit?: number | undefined, offset?: number | undefined, sort?: string | undefined};

export type GetApiV3PairsOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const pair = z.object({causeMeasurement: z.number(), causeMeasurementValue: z.number(), causeVariableUnitAbbreviatedName: z.string(), effectMeasurement: z.number(), effectMeasurementValue: z.number(), effectVariableUnitAbbreviatedName: z.string(), eventAt: z.string().optional(), eventAtUnixTime: z.number().int().optional(), startTimeString: z.string().optional(), timestamp: z.number().int()});

export const getApiV3PairsResponse = z.array(pair);

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 pairs of measurements for correlational analysis
 * 
 * GET /v3/pairs
 * 
 * Also accepts auth: curedao_oauth2
 */
export const getApiV3Pairs = async (args: GetApiV3PairsArgs, options?: GetApiV3PairsOptions) => {
const {baseUrl = "https://app.quantimo.do/api", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args.causeVariableName != null) query.append("causeVariableName", String(args.causeVariableName))
if (args.effectVariableName != null) query.append("effectVariableName", String(args.effectVariableName))
if (args.causeVariableId != null) query.append("causeVariableId", String(args.causeVariableId))
if (args.effectVariableId != null) query.append("effectVariableId", String(args.effectVariableId))
if (args.predictorVariableName != null) query.append("predictorVariableName", String(args.predictorVariableName))
if (args.outcomeVariableName != null) query.append("outcomeVariableName", String(args.outcomeVariableName))
if (args.effectUnitName != null) query.append("effectUnitName", String(args.effectUnitName))
if (args.userId != null) query.append("userId", String(args.userId))
if (args.causeUnitName != null) query.append("causeUnitName", String(args.causeUnitName))
if (args.onsetDelay != null) query.append("onsetDelay", String(args.onsetDelay))
if (args.durationOfAction != null) query.append("durationOfAction", String(args.durationOfAction))
if (args.earliestMeasurementTime != null) query.append("earliestMeasurementTime", String(args.earliestMeasurementTime))
if (args.latestMeasurementTime != null) query.append("latestMeasurementTime", String(args.latestMeasurementTime))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.offset != null) query.append("offset", String(args.offset))
if (args.sort != null) query.append("sort", String(args.sort))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v3/pairs${query.size > 0 ? `?${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(getApiV3PairsResponse, await res.json())
};