import {z} from 'zod'

export type GetApiReposOwnerRepoContentsFilepathArgs = {owner: string, repo: string, filepath: string, ref?: string | undefined};

export type GetApiReposOwnerRepoContentsFilepathOptions = {baseUrl: string, BasicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const fileLinksResponse = z.object({git: z.string().optional(), html: z.string().optional(), self: z.string().optional()});

export const contentsResponse = z.object({_links: fileLinksResponse.optional(), content: z.string().optional(), download_url: z.string().optional(), encoding: z.string().optional(), git_url: z.string().optional(), html_url: z.string().optional(), last_author_date: z.string().optional(), last_commit_message: z.string().optional(), last_commit_sha: z.string().optional(), last_committer_date: z.string().optional(), lfs_oid: z.string().optional(), lfs_size: z.number().int().optional(), mode: z.string().optional(), name: z.string().optional(), path: z.string().optional(), sha: z.string().optional(), size: z.number().int().optional(), submodule_git_url: z.string().optional(), target: z.string().optional(), type: z.string().optional(), url: z.string().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
};

/**
 * Gets the metadata and contents (if a file) of an entry in a repository, or a list of entries if a dir.
 * 
 * GET /repos/{owner}/{repo}/contents/{filepath}
 * 
 * Also accepts auth: Token, AccessToken, AuthorizationHeaderToken, SudoParam, SudoHeader, TOTPHeader
 */
export const getApiReposOwnerRepoContentsFilepath = async (args: GetApiReposOwnerRepoContentsFilepathArgs, options: GetApiReposOwnerRepoContentsFilepathOptions) => {
const {baseUrl, fetch: fetchFn = fetch, BasicAuth} = options ?? {}

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

if (args.ref != null) query.append("ref", String(args.ref))
if (BasicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${BasicAuth.username}:${BasicAuth.password}`)}`)

const url = `${baseUrl.replace(/\/+$/, '')}/repos/${encodeURIComponent(String(args.owner))}/${encodeURIComponent(String(args.repo))}/contents/${encodeURIComponent(String(args.filepath))}${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(contentsResponse, await res.json())
};