import {z} from 'zod'

export type GetApiReposRepoIdCompareArgs = {base_id?: string | undefined, other_id?: string | undefined};

export type GetApiReposRepoIdCompareOptions = {baseUrl?: string | undefined, OAuth2?: string | undefined, fetch?: typeof fetch | undefined};

export const objectStatus = z.union([z.literal(1), z.literal(2), z.literal(3), z.literal(4)]);

export const fileMode = z.union([z.literal(16877), z.literal(33188), z.literal(33261), z.literal(40960)]);

export const storageUri = z.string();

export const storageBackend = z.union([z.literal(1), z.literal(2)]);

export const fileEntry = z.object({path: z.string(), prev_path: z.string().optional(), status: objectStatus, mode: fileMode, mtime: z.string().optional(), blob: z.object({storage_uri: storageUri, storage_backend: storageBackend, size: z.number().int(), sha: z.string()}).optional()});

export const comparisonItem = z.object({base_item: fileEntry.optional(), other_item: fileEntry.optional(), status: objectStatus});

export const getApiReposRepoIdCompareResponse = z.object({object: z.literal("ComparisonItem"), items: z.array(comparisonItem), cascaded_changes_count: z.number().int()});

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
};

/**
 * Compare two refs (commit/branch/workspace/tag/tree) in this repo
 * 
 * GET /repos/{repo_id}/compare
 */
export const getApiReposRepoIdCompare = async (args: GetApiReposRepoIdCompareArgs, options?: GetApiReposRepoIdCompareOptions) => {
const {baseUrl = "https://api.diversion.dev/v0", fetch: fetchFn = fetch, OAuth2} = options ?? {}

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

if (args.base_id != null) query.append("base_id", String(args.base_id))
if (args.other_id != null) query.append("other_id", String(args.other_id))
if (OAuth2 !== undefined) headers.set('authorization', `Bearer ${OAuth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/repos/${encodeURIComponent(String(args.repo_id))}/compare${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(getApiReposRepoIdCompareResponse, await res.json())
};