import {z} from 'zod'

export type CreateApiApiTransactionsImportPreviewArgs = {'X-Workspace-Id'?: (string | null) | undefined, body: BodyInit};

export type CreateApiApiTransactionsImportPreviewOptions = {baseUrl: string, OAuth2PasswordBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const transactionImportOutput = z.object({description: z.string(), amount: z.string(), date: z.string(), type: z.string(), external_id: z.string().nullable().optional(), currency: z.string().nullable().optional(), fx_rate: z.string().nullable().optional(), payee_raw: z.string().nullable().optional(), category_name: z.string().nullable().optional(), suggested_category_id: z.string().nullable().optional(), suggested_category_name: z.string().nullable().optional(), excluded: z.boolean().optional(), category_id: z.string().nullable().optional(), force_uncategorized: z.boolean().optional(), notes: z.string().nullable().optional()});

export const failedRow = z.object({line_number: z.number().int(), description: z.string(), raw_value: z.string(), error_reason: z.string()});

export const transactionImportPreview = z.object({transactions: z.array(transactionImportOutput), detected_format: z.string(), csv_columns: z.array(z.string()).optional(), parse_error: z.string().nullable().optional(), failed_rows: z.array(failedRow).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
};

/**
 * Preview Import
 * 
 * POST /api/transactions/import/preview
 */
export const createApiApiTransactionsImportPreview = async (args: CreateApiApiTransactionsImportPreviewArgs, options: CreateApiApiTransactionsImportPreviewOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth2PasswordBearer} = options ?? {}

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

if (args['X-Workspace-Id'] != null) headers.set("X-Workspace-Id", String(args['X-Workspace-Id']))
if (OAuth2PasswordBearer !== undefined) headers.set('authorization', `Bearer ${OAuth2PasswordBearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/transactions/import/preview${query.size > 0 ? `?${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(transactionImportPreview, await res.json())
};