import {z} from 'zod'

export type GetApiApiV1ReadyOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const componentStatus = z.enum(["healthy", "degraded", "unhealthy"]);

export const pluginHealth = z.object({avg_response_time_ms: z.number().int().gte(0).optional(), circuit_state: z.string().optional(), connection_pool_active_connections: z.number().int().gte(0).optional(), connection_pool_available_slots: z.number().int().gte(0).optional(), enabled: z.boolean(), error: z.string().optional(), memory: z.number().int().gte(0).optional(), pool_completed: z.number().int().gte(0).optional(), pool_queued: z.number().int().gte(0).optional(), recovering: z.boolean().optional(), recovery_percent: z.number().int().gte(0).optional(), shared_socket_active_connections: z.number().int().gte(0).optional(), shared_socket_available_slots: z.number().int().gte(0).optional(), shared_socket_registered_executions: z.number().int().gte(0).optional(), status: componentStatus, success_rate: z.number().optional(), uptime_ms: z.number().int().gte(0).optional()});

export const queueHealth = z.object({error: z.string().optional(), status: componentStatus});

export const poolStatus = z.object({available: z.number().int().gte(0), connected: z.boolean(), error: z.string().optional(), max_size: z.number().int().gte(0)});

export const redisHealth = z.object({error: z.string().optional(), primary_pool: poolStatus, reader_pool: poolStatus, status: componentStatus});

export const systemHealth = z.object({close_wait_count: z.number().int().gte(0), error: z.string().optional(), fd_count: z.number().int().gte(0), fd_limit: z.number().int().gte(0), fd_usage_percent: z.number().int().gte(0), status: componentStatus});

export const components = z.object({plugins: pluginHealth.optional(), queue: queueHealth, redis: redisHealth, system: systemHealth});

export const readinessResponse = z.object({components: components, ready: z.boolean(), reason: z.string().optional(), status: componentStatus, timestamp: z.string()});

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
};

/**
 * Readiness endpoint that checks system resources, Redis, Queue, and plugins.
 * 
 * GET /api/v1/ready
 */
export const getApiApiV1Ready = async (options: GetApiApiV1ReadyOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/ready${query.size > 0 ? `?${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(readinessResponse, await res.json())
};