import {z} from 'zod'

export type CreateApiV1InvoicesAnalyzeArgs = {annualize?: string | undefined, body: BodyInit};

export type CreateApiV1InvoicesAnalyzeOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const analyzeInvoiceResult = z.union([z.object({status: z.literal("rejected"), validation: z.object({isEnergyInvoice: z.boolean(), invoiceType: z.enum(["ADVANCE_INVOICE", "MONTHLY_SETTLEMENT", "YEARLY_SETTLEMENT"]).nullable(), merchant: z.string().nullable(), electricityPeriod: z.object({startDate: z.string().nullable(), endDate: z.string().nullable(), daysInPeriod: z.number().nullable()}).nullable(), gasPeriod: z.object({startDate: z.string().nullable(), endDate: z.string().nullable(), daysInPeriod: z.number().nullable()}).nullable(), hasExclusiveNightMeter: z.boolean(), confidence: z.number(), reason: z.string()})}), z.object({status: z.literal("analyzed"), validation: z.object({isEnergyInvoice: z.boolean(), invoiceType: z.enum(["ADVANCE_INVOICE", "MONTHLY_SETTLEMENT", "YEARLY_SETTLEMENT"]).nullable(), merchant: z.string().nullable(), electricityPeriod: z.object({startDate: z.string().nullable(), endDate: z.string().nullable(), daysInPeriod: z.number().nullable()}).nullable(), gasPeriod: z.object({startDate: z.string().nullable(), endDate: z.string().nullable(), daysInPeriod: z.number().nullable()}).nullable(), hasExclusiveNightMeter: z.boolean(), confidence: z.number(), reason: z.string()}), extraction: z.object({merchant: z.string().nullable(), customer: z.object({postalCode: z.string().nullable(), city: z.string().nullable()}), electricity: z.object({ean: z.string().nullable(), tariffType: z.enum(["enkelvoudig", "tweevoudig", "nachtmeter"]).nullable(), priceModel: z.enum(["FIXED", "VARIABLE", "DYNAMIC"]).nullable(), period: z.object({startDate: z.string().nullable(), endDate: z.string().nullable(), daysInPeriod: z.number().nullable()}), consumptionTotalKwh: z.number().nullable(), consumptionDayKwh: z.number().nullable(), consumptionNightKwh: z.number().nullable(), injectionTotalKwh: z.number().nullable(), hasSolarPanels: z.boolean().nullable(), cost: z.object({value: z.object({exclVat: z.number().nullable()}), unit: z.literal("EUR")})}).nullable(), gas: z.object({ean: z.string().nullable(), priceModel: z.enum(["FIXED", "VARIABLE", "DYNAMIC"]).nullable(), period: z.object({startDate: z.string().nullable(), endDate: z.string().nullable(), daysInPeriod: z.number().nullable()}), consumptionTotalKwh: z.number().nullable(), cost: z.object({value: z.object({exclVat: z.number().nullable()}), unit: z.literal("EUR")})}).nullable(), confidence: z.number(), requiresReview: z.boolean()}), annualised: z.object({electricity: z.object({daysInPeriod: z.number().nullable(), periodReliable: z.boolean(), advisory: z.string().nullable(), totalConsumption: z.number().nullable(), dayConsumption: z.number().nullable(), nightConsumption: z.number().nullable(), injection: z.number().nullable(), peakConsumption: z.number().nullable(), cost: z.object({value: z.object({exclVat: z.number().nullable()}), unit: z.literal("EUR")})}).nullable(), gas: z.object({daysInPeriod: z.number().nullable(), periodReliable: z.boolean(), advisory: z.string().nullable(), totalConsumption: z.number().nullable(), cost: z.object({value: z.object({exclVat: z.number().nullable()}), unit: z.literal("EUR")})}).nullable()}).nullable()})]);

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
};

/**
 * Analyze an uploaded energy invoice
 * 
 * POST /v1/invoices/analyze
 */
export const createApiV1InvoicesAnalyze = async (args: CreateApiV1InvoicesAnalyzeArgs, options?: CreateApiV1InvoicesAnalyzeOptions) => {
const {baseUrl = "https://open-energie.api.vwala.be", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.annualize != null) query.append("annualize", String(args.annualize))
if (apiKey !== undefined) headers.set("x-api-key", apiKey)

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

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

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

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