import {z} from 'zod'

export type SimulateRuleDefinition = {config: {[key: string]: unknown}, type: string};

export type SimulateMatchRequest = {contextId: string, rule?: SimulateRuleDefinition | undefined, ruleId?: string | undefined, sampleLimit?: number | undefined};

export type CreateApiV1MatchingSimulateArgs = {body: SimulateMatchRequest};

export type CreateApiV1MatchingSimulateOptions = {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 simulateMatchPairResponse = z.object({amountDelta: z.string(), dateDeltaDays: z.number().int(), left: candidateTransactionView, right: candidateTransactionView, score: z.number().int().gte(0).lte(100), why: candidateWhy});

export const simulateMatchResponse = z.object({matchedGroups: z.number().int().gte(0), ruleId: z.string().optional(), ruleType: z.string(), sample: z.array(simulateMatchPairResponse).nullable(), sampleTruncated: z.boolean(), unmatchedLeft: z.number().int().gte(0), unmatchedRight: z.number().int().gte(0)});

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
};

/**
 * Simulate a match rule against a context (read-only dry run)
 * 
 * POST /v1/matching/simulate
 */
export const createApiV1MatchingSimulate = async (args: CreateApiV1MatchingSimulateArgs, options?: CreateApiV1MatchingSimulateOptions) => {
const {baseUrl = "https://identity.sandbox.lerian.net", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

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