import {z} from 'zod'

export type GetApiSegmentsArgs = {limit?: number | undefined, starting_after?: string | undefined};

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

export const v4SegmentCondition = z.object({metric: z.string(), comparator: z.string(), value: z.string(), negate: z.boolean().optional()});

export const v4Segment = z.object({object: z.string(), id: z.string(), url: z.string(), name: z.string(), is_system: z.boolean(), conditions: z.array(v4SegmentCondition), created_at: z.string(), updated_at: z.string()});

export const v4SegmentList = z.object({object: z.string(), url: z.string(), data: z.array(v4Segment), has_more: z.boolean(), next_cursor: z.string().nullable().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
};

/**
 * List segments
 * 
 * GET /segments
 */
export const getApiSegments = async (args: GetApiSegmentsArgs, options?: GetApiSegmentsOptions) => {
const {baseUrl = "https://api.qonversion.io/v4", fetch: fetchFn = fetch, secretAuth} = options ?? {}

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

if (args.limit != null) query.append("limit", String(args.limit))
if (args.starting_after != null) query.append("starting_after", String(args.starting_after))
if (secretAuth !== undefined) headers.set('authorization', `Bearer ${secretAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/segments${query.size > 0 ? `?${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(v4SegmentList, await res.json())
};