import {z} from 'zod'

export type CreateApiV1EstimationsArgs = {body: {energyTypes: Array<'ELECTRICITY' | 'GAS'>, familySize: '1' | '2' | '3' | '4' | '>5', hasHeatPump?: boolean | undefined, evCount?: number | undefined, solarPanelCount?: number | undefined, hasBattery?: boolean | undefined}};

export type CreateApiV1EstimationsOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const electricityConsumptionProfile = z.object({consumptionTotalKwh: z.number(), consumptionDayKwh: z.number().nullable(), consumptionNightKwh: z.number().nullable(), injectionTotalKwh: z.number().nullable(), injectionDayKwh: z.number().nullable(), injectionNightKwh: z.number().nullable(), peakConsumptionKw: z.number().nullable(), inverterCapacityKva: z.number().nullable()});

export const gasConsumptionProfile = z.object({consumptionTotalKwh: z.number()});

export const estimationResult = z.object({electricity: electricityConsumptionProfile.optional(), gas: gasConsumptionProfile.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
};

/**
 * Estimate a Consumption Profile from an Energy Profile
 * 
 * POST /v1/estimations
 */
export const createApiV1Estimations = async (args: CreateApiV1EstimationsArgs, options?: CreateApiV1EstimationsOptions) => {
const {baseUrl = "https://open-energie.api.vwala.be", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (apiKey !== undefined) headers.set("x-api-key", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/estimations${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(estimationResult, await res.json())
};