import {z} from 'zod'

export type GetApiV1MatchingCandidatesArgs = {contextId: string, transactionId: string, limit?: number | undefined};

export type GetApiV1MatchingCandidatesOptions = {baseUrl?: string | undefined, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const candidateTransactionView = z.object({amount: z.string(), baseAmount: z.string().optional(), currency: z.string(), date: z.string(), externalId: z.string().optional(), id: z.string(), sourceId: z.string()});

export const candidateMatchedKey = z.object({agreed: z.boolean(), field: z.string()});

export const candidateWhy = z.object({amountMatch: z.boolean(), currencyMatch: z.boolean(), dateMatch: z.boolean(), matchedKeys: z.array(candidateMatchedKey).nullable().optional(), referenceScore: z.number().gte(0).lte(1)});

export const candidateProposalResponse = z.object({amountDelta: z.string(), dateDeltaDays: z.number().int(), ruleId: z.string(), ruleType: z.string(), score: z.number().int().gte(0).lte(100), transaction: candidateTransactionView, why: candidateWhy});

export const candidateProposalsResponse = z.object({items: z.array(candidateProposalResponse).nullable(), targetTransactionId: 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
};

/**
 * List match candidates for a transaction
 * 
 * GET /v1/matching/candidates
 */
export const getApiV1MatchingCandidates = async (args: GetApiV1MatchingCandidatesArgs, options?: GetApiV1MatchingCandidatesOptions) => {
const {baseUrl = "https://identity.sandbox.lerian.net", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (args.contextId != null) query.append("contextId", String(args.contextId))
if (args.transactionId != null) query.append("transactionId", String(args.transactionId))
if (args.limit != null) query.append("limit", String(args.limit))
if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/matching/candidates${query.size > 0 ? `?${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(candidateProposalsResponse, await res.json())
};