// Server stats / health helpers.
// Wraps /api/v1/admin/monitoring/* + /api/v1/platform/* + a few observability
// endpoints used by the monitoring dashboard.

import type { ArcadiaClient } from "@crema/arcadia-client"

// --- Rate limits ---------------------------------------------------------

export interface RateLimit {
  type: string
  max_requests: number
  window_seconds: number
}

export async function getRateLimits(arcadia: ArcadiaClient): Promise<RateLimit[]> {
  const res = await arcadia.GET<{ data: { limits: RateLimit[] } }>(
    "/api/v1/admin/monitoring/rate-limits",
  )
  return res.data.limits ?? []
}

// --- Active sessions ----------------------------------------------------

export interface ActiveSession {
  user_id: string
  email: string
  first_name: string | null
  last_name: string | null
  status: string
  user_type: string | null
  last_sign_in_at: string
  tenant_id: string
  two_factor_enabled: boolean
}

export async function getActiveSessions(
  arcadia: ArcadiaClient,
): Promise<{ sessions: ActiveSession[]; count: number }> {
  const res = await arcadia.GET<{ data: { sessions: ActiveSession[]; count: number } }>(
    "/api/v1/admin/monitoring/sessions",
  )
  return res.data
}

// --- Background jobs (Oban) ---------------------------------------------

export type JobState =
  | "available"
  | "executing"
  | "scheduled"
  | "retryable"
  | "discarded"
  | "cancelled"
  | "completed"

export interface JobStats {
  counts: Record<JobState, number>
  by_queue: Record<string, Partial<Record<JobState, number>>>
  queues: string[]
}

export interface ObanJob {
  id: number
  queue: string
  state: JobState
  worker: string
  attempt: number
  max_attempts: number
  inserted_at: string
  attempted_at: string | null
  completed_at: string | null
  scheduled_at: string | null
  errors: Array<{ at?: string; attempt?: number; error?: string }> | null
}

export async function getJobStats(arcadia: ArcadiaClient): Promise<JobStats> {
  const res = await arcadia.GET<{ data: JobStats }>(
    "/api/v1/admin/monitoring/jobs/stats",
  )
  return res.data
}

export async function getRecentJobs(
  arcadia: ArcadiaClient,
  params?: { limit?: number; state?: JobState; queue?: string },
): Promise<ObanJob[]> {
  const res = await arcadia.GET<{ data: { jobs: ObanJob[]; count: number } }>(
    "/api/v1/admin/monitoring/jobs",
    { params: params as Record<string, string | number | undefined> },
  )
  return res.data.jobs ?? []
}

export async function retryJob(arcadia: ArcadiaClient, id: number): Promise<void> {
  await arcadia.POST(`/api/v1/admin/monitoring/jobs/${id}/retry`)
}

// --- Platform infrastructure (DigitalOcean) -----------------------------

/** Provider returns whatever it returns; admin UI surfaces it loosely. */
export type InfrastructureSummary = Record<string, unknown>
export type Space = Record<string, unknown>

export async function getInfrastructureSummary(
  arcadia: ArcadiaClient,
): Promise<InfrastructureSummary | null> {
  try {
    const res = await arcadia.GET<{ data: InfrastructureSummary }>(
      "/api/v1/platform/infrastructure/summary",
    )
    return res.data
  } catch {
    return null
  }
}

export async function getSpaces(arcadia: ArcadiaClient): Promise<Space[]> {
  try {
    const res = await arcadia.GET<{ data: Space[] }>(
      "/api/v1/platform/infrastructure/spaces",
    )
    return res.data ?? []
  } catch {
    return []
  }
}

// --- Droplets ------------------------------------------------------------

export interface Droplet {
  id: number | string
  name: string
  status: string
  region?: { slug?: string; name?: string } | string
  size_slug?: string
  vcpus?: number
  memory?: number
  disk?: number
  created_at?: string
  networks?: unknown
  /** Provider-specific fields surface verbatim. */
  [key: string]: unknown
}

export interface DropletMetrics {
  cpu?: Array<{ time: string; value: number }>
  memory?: Array<{ time: string; value: number }>
  disk?: Array<{ time: string; value: number }>
  bandwidth?: Array<{ time: string; value: number }>
  [key: string]: unknown
}

export async function listDroplets(arcadia: ArcadiaClient): Promise<Droplet[]> {
  try {
    const res = await arcadia.GET<{ droplets?: Droplet[]; data?: Droplet[] }>(
      "/api/v1/platform/droplets",
    )
    return res.droplets ?? res.data ?? []
  } catch {
    return []
  }
}

export async function getDropletMetrics(
  arcadia: ArcadiaClient,
  id: number | string,
): Promise<DropletMetrics | null> {
  try {
    const res = await arcadia.GET<{ data: DropletMetrics }>(
      `/api/v1/platform/droplets/${id}/metrics`,
    )
    return res.data
  } catch {
    return null
  }
}

// --- Audit stats (already used by /activity, exposed here for the dashboard) ---

export interface AuditStats {
  total: number
  by_action?: Record<string, number>
  by_severity?: Record<string, number>
  by_resource_type?: Record<string, number>
  /** When backend supports it: { period: ISO, total: number }[] */
  over_time?: Array<{ period: string; total: number }>
  [key: string]: unknown
}

export async function getAuditStats(
  arcadia: ArcadiaClient,
  params?: { from?: string; to?: string },
): Promise<AuditStats> {
  const res = await arcadia.GET<{ data: AuditStats }>(
    "/api/v1/observability/audit_stats",
    { params: params as Record<string, string | undefined> },
  )
  return res.data
}