import {z} from 'zod'

export type GetApiV1ClaimsClaimIdArgs = {claim_id: string};

export type GetApiV1ClaimsClaimIdOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const reasonCode = z.object({code: z.string(), description: z.string()});

export const claimReviewResponse = z.object({authorization_id: z.string(), denial_predicted: z.boolean(), denial_reasons: z.array(reasonCode).optional(), expected_reimbursement: z.object({allowed: z.number().optional(), expected: z.number()}), expected_payment_date: z.string().optional(), confidence: z.number().gte(0).lte(1).optional(), id: z.string().optional()});

export const adjudication = z.object({settlement_id: z.string(), decision: z.enum(["approved", "declined", "manual_review"]), terms: z.object({advance_percentage: z.number().optional(), advance_amount: z.number().optional(), fees_estimate: z.number().optional()}).optional(), status: z.enum(["pending_confirmation", "approved", "declined", "canceled", "funded"]), expected_reimbursement: z.number().optional(), expected_payment_date: z.string().optional()});

export const claimStatus = z.object({claim_id: z.string(), status: z.string(), updated_at: z.string()});

export const claim = z.object({claim_identifier: z.string().optional(), review: claimReviewResponse.optional(), adjudication: adjudication.optional(), status: claimStatus.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
};

/**
 * Fetch a claim rollup (review + adjudication + status)
 * 
 * GET /v1/claims/{claim_id}
 */
export const getApiV1ClaimsClaimId = async (args: GetApiV1ClaimsClaimIdArgs, options?: GetApiV1ClaimsClaimIdOptions) => {
const {baseUrl = "https://api.sandbox.thrivory.com", fetch: fetchFn = fetch, oauth2} = options ?? {}

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

if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/claims/${encodeURIComponent(String(args.claim_id))}${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(claim, await res.json())
};