import {z} from 'zod'

export type GetApiFeaturesArgs = {page?: number | undefined, per_page?: number | undefined, search_term?: string | undefined};

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

export const featurePrivilegeObject = z.object({code: z.string(), name: z.string().nullable(), value_type: z.enum(["integer", "boolean", "string", "select"]), config: z.object({select_options: z.array(z.string()).optional()})});

export const featureObject = z.object({code: z.string(), name: z.string().nullable(), description: z.string().nullable(), privileges: z.array(featurePrivilegeObject), created_at: z.string()});

export const paginationMeta = z.object({current_page: z.number().int(), next_page: z.number().int().nullable().optional(), prev_page: z.number().int().nullable().optional(), total_pages: z.number().int(), total_count: z.number().int()});

export const featuresPaginated = z.object({features: z.array(featureObject), meta: paginationMeta});

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 all features
 * 
 * GET /features
 */
export const getApiFeatures = async (args: GetApiFeaturesArgs, options?: GetApiFeaturesOptions) => {
const {baseUrl = "https://api.getlago.com/api/v1", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args.page != null) query.append("page", String(args.page))
if (args.per_page != null) query.append("per_page", String(args.per_page))
if (args.search_term != null) query.append("search_term", String(args.search_term))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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