import {z} from 'zod'

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

export const pipelineState = z.enum(["queued", "running", "paused", "skipped", "not_built", "finished", "success", "unstable", "failure", "unknown", "aborted"]);

export const inputStep = z.object({message: z.string().optional(), cancel: z.string().optional(), id: z.string().optional(), ok: z.string().optional(), parameters: z.boolean().optional(), canProceed: z.boolean().optional(), canAbort: z.boolean().optional(), approvers: z.array(z.string()).optional()});

export const pipelineStage: z.ZodType<PipelineStage> = z.object({id: z.string().optional(), name: z.string().optional(), state: pipelineState.optional(), type: z.string().optional(), title: z.string().optional(), pauseDurationMillis: z.number().int().optional(), startTimeMillis: z.number().int().optional(), totalDurationMillis: z.unknown(), children: z.array(z.lazy(() => pipelineStage)).optional(), seqContainerName: z.unknown(), nextSibling: z.lazy(() => pipelineStage.optional()), isSequential: z.boolean().optional(), synthetic: z.boolean().optional(), placeholder: z.boolean().optional(), agent: z.unknown(), causeOfBlockage: z.unknown(), url: z.string().optional(), inputStep: inputStep.optional()});

export const pipelineGraph = z.object({complete: z.boolean().optional(), stages: z.array(pipelineStage).optional()});

export const pipelineTreeResponse = z.object({status: z.literal("ok").optional(), data: pipelineGraph.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
};

/**
 * Get pipeline stage tree
 * 
 * GET /tree
 */
export const getApiTree = async (options?: GetApiTreeOptions) => {
const {baseUrl = "http://localhost:8080/jenkins/job/my-pipeline/1/stages", fetch: fetchFn = fetch} = options ?? {}

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

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