import {z} from 'zod'

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

export const getApiHealthDetailedResponse = z.object({success: z.literal(true), timestamp: z.number(), status: z.enum(["healthy", "degraded", "unhealthy"]), uptime: z.number().gte(0), version: z.string(), environment: z.string(), components: z.object({database: z.object({status: z.enum(["healthy", "degraded", "unhealthy"]), lastCheck: z.number(), responseTime: z.number(), details: z.record(z.string(), z.unknown()).optional()}), kvStore: z.object({status: z.enum(["healthy", "degraded", "unhealthy"]), lastCheck: z.number(), responseTime: z.number(), details: z.record(z.string(), z.unknown()).optional()}), durableObjects: z.object({status: z.enum(["healthy", "degraded", "unhealthy"]), lastCheck: z.number(), responseTime: z.number(), details: z.record(z.string(), z.unknown()).optional()}), analytics: z.object({status: z.enum(["healthy", "degraded", "unhealthy"]), lastCheck: z.number(), responseTime: z.number(), details: z.record(z.string(), z.unknown()).optional()}), rateLimiter: z.object({status: z.enum(["healthy", "degraded", "unhealthy"]), lastCheck: z.number(), responseTime: z.number(), details: z.record(z.string(), z.unknown()).optional()}), scheduler: z.object({status: z.enum(["healthy", "degraded", "unhealthy"]), lastCheck: z.number(), responseTime: z.number(), details: z.record(z.string(), z.unknown()).optional()}), cache: z.object({status: z.enum(["healthy", "degraded", "unhealthy"]), lastCheck: z.number(), responseTime: z.number(), details: z.record(z.string(), z.unknown()).optional()}), externalServices: z.object({status: z.enum(["healthy", "degraded", "unhealthy"]), lastCheck: z.number(), responseTime: z.number(), details: z.record(z.string(), z.unknown()).optional()})}), performance: z.object({cpuUsage: z.number().gte(0).lte(100), memoryUsage: z.number().gte(0).lte(100), requestsPerSecond: z.number().gte(0), averageResponseTime: z.number().gte(0), activeConnections: z.number().int().gte(0), queuedJobs: z.number().int().gte(0)}), statistics: z.object({totalRequests: z.number().int().gte(0), totalErrors: z.number().int().gte(0), totalAuctions: z.number().int().gte(0), totalBids: z.number().int().gte(0), totalUsers: z.number().int().gte(0), totalOrganizations: z.number().int().gte(0), activeApiKeys: z.number().int().gte(0)}), message: 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
};

/**
 * Detailed health check
 * 
 * GET /health/detailed
 */
export const getApiHealthDetailed = async (options?: GetApiHealthDetailedOptions) => {
const {baseUrl = "https://xga-auction-system.workers.dev", fetch: fetchFn = fetch} = options ?? {}

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

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