import {z} from 'zod'

export type GetApiStatsRunsArgs = {status?: (Array<'pending' | 'starting' | 'running' | 'crashed' | 'errored' | 'exited' | 'cancelled' | 'retrying'>) | undefined, start_at: string, end_at: string, timezone?: string | undefined, environment?: string | undefined};

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

export const runTimeseriesPoint = z.object({cancelled: z.number().int(), crashed: z.number().int(), errored: z.number().int(), exited: z.number().int(), pending: z.number().int(), period: z.string(), retrying: z.number().int(), running: z.number().int(), scheduled: z.number().int(), starting: z.number().int()});

export const statisticsSettings = z.object({end_at: z.string(), environment: z.string(), interval: z.enum(["daily", "hourly"]), start_at: z.string(), timezone: z.string()});

export const runStatistics = z.object({cancelled_runs: z.number().int(), crashed_runs: z.number().int(), errored_runs: z.number().int(), exited_runs: z.number().int(), running_runs: z.number().int(), total_runs: z.number().int()});

export const generateRunStatisticsResponse = z.object({$schema: z.string().optional(), series: z.array(runTimeseriesPoint), settings: statisticsSettings, stats: runStatistics});

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
};

/**
 * Generate run statistics
 * 
 * GET /stats/runs
 * 
 * Also accepts auth: APIKeyAuth
 */
export const getApiStatsRuns = async (args: GetApiStatsRunsArgs, options?: GetApiStatsRunsOptions) => {
const {baseUrl = "https://api.tower.dev/v1", fetch: fetchFn = fetch, AccessTokenAuth} = options ?? {}

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

if (args.status != null) query.append("status", args.status.join(','))
if (args.start_at != null) query.append("start_at", String(args.start_at))
if (args.end_at != null) query.append("end_at", String(args.end_at))
if (args.timezone != null) query.append("timezone", String(args.timezone))
if (args.environment != null) query.append("environment", String(args.environment))
if (AccessTokenAuth !== undefined) headers.set('authorization', `Bearer ${AccessTokenAuth}`)

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