import {z} from 'zod'

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

export const taskStatusSchema = z.object({task_id: z.string(), status: z.string(), started_at: z.string().nullable().optional(), completed_at: z.string().nullable().optional(), elapsed_seconds: z.number().nullable().optional(), databases: z.record(z.string(), z.unknown()).optional(), current_database: z.string().nullable().optional(), current_step: z.string().nullable().optional(), log_tail: z.array(z.string()).optional(), successful: z.number().int().nullable().optional(), failed: z.number().int().nullable().optional(), message: z.string().nullable().optional()});

export const taskListResponse = z.object({tasks: z.array(taskStatusSchema), total: z.number().int(), running: 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
};

/**
 * List Tasks
 * 
 * GET /preprocessing/tasks
 */
export const getApiPreprocessingTasks = async (options: GetApiPreprocessingTasksOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

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