import {z} from 'zod'

export type CreateApiApiV1EstimateBatteryValueArgs = {body: {zipCode: string, monthlyKwh: number, monthlyExportKwh?: number | undefined, currentMonthlyCostDollars?: number | undefined, solarSizeKw?: number | undefined, batteryBrand?: ('tesla' | 'solaredge' | 'enphase' | 'qcells' | 'franklin' | 'other') | undefined, batteryCapacityKwh?: number | undefined}};

export type CreateApiApiV1EstimateBatteryValueOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const createApiApiV1EstimateBatteryValueResponse = z.object({status: z.literal("early_access"), message: z.string(), requestId: z.string(), requestedFor: z.object({zipCode: z.string(), monthlyKwh: z.number(), monthlyExportKwh: z.number().nullable(), currentMonthlyCostDollars: z.number().nullable(), solarSizeKw: z.number().nullable(), batteryBrand: z.string().nullable(), batteryCapacityKwh: z.number().nullable()}), publicAlternatives: z.object({batterySurvey: z.string(), batteryAnalysis: z.string(), installerQuotes: z.string()}), expectedResponseShape: z.object({recommendation: z.object({action: z.string(), reason: z.string()}), vppEligibility: z.object({eligible: z.boolean(), customerCreditDollarsPerKwhMonth: z.number(), estimatedAnnualCreditDollars: z.number()}), payback: z.object({estimatedInstalledCostDollars: z.number(), annualBenefitDollars: z.number(), simplePaybackYears: z.number()}), recommendedBattery: z.object({brand: z.string(), capacityKwh: z.number(), rationale: z.string()}), partnerInstaller: z.object({name: z.string(), quoteUrl: z.string()}).nullable(), planPairingSuggestion: z.object({planName: z.string(), reason: z.string()}).nullable()}), estimatedAvailability: z.string()});

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
};

/**
 * Texas Battery Value Estimator
 * 
 * POST /api/v1/estimate-battery-value
 */
export const createApiApiV1EstimateBatteryValue = async (args: CreateApiApiV1EstimateBatteryValueArgs, options?: CreateApiApiV1EstimateBatteryValueOptions) => {
const {baseUrl = "https://meterplan.com", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/estimate-battery-value${query.size > 0 ? `?${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(createApiApiV1EstimateBatteryValueResponse, await res.json())
};