import {z} from 'zod'

export type GetApiFieldMappingArgs = {'x-revert-public-token': string, 'x-revert-t-id': string, 'x-revert-t-token': string};

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

export const commonStandardObject = z.enum(["company", "contact", "deal", "event", "lead", "note", "task", "user"]);

export const mappableFieldType = z.object({fieldName: z.string(), objectName: commonStandardObject});

export const getFieldMappingConfigResponse = z.object({canAddCustomMapping: z.boolean(), mappableFields: z.array(mappableFieldType), fieldList: z.unknown()});

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
};

/**
 * Get field mappings configs for a connection
 * 
 * GET /field-mapping
 */
export const getApiFieldMapping = async (args: GetApiFieldMappingArgs, options?: GetApiFieldMappingOptions) => {
const {baseUrl = "https://api.revert.dev", fetch: fetchFn = fetch} = options ?? {}

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

if (args['x-revert-public-token'] != null) headers.set("x-revert-public-token", String(args['x-revert-public-token']))
if (args['x-revert-t-id'] != null) headers.set("x-revert-t-id", String(args['x-revert-t-id']))
if (args['x-revert-t-token'] != null) headers.set("x-revert-t-token", String(args['x-revert-t-token']))

const url = `${baseUrl.replace(/\/+$/, '')}/field-mapping${query.size > 0 ? `?${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(getFieldMappingConfigResponse, await res.json())
};