// @homepilot/compute-client — jobs, progress, devices, and sharing policy.
//
// THE single source of truth for Wave A/B compute behaviour. Web, desktop, and
// mobile all build the same client and call the same methods — so a fix here
// (e.g. job-polling) reaches every app on its next build, with no duplication.
//
// Transport for progress events is an injected port (SSE on web/desktop, a
// polyfill or polling on mobile), keeping this module platform-pure.

import type { ApiClient } from "@homepilot/api-client";
import type {
  Device,
  Job,
  JobEvent,
  ComputeStatus,
  SupplierPolicy,
  ComputeSource,
  ComputeDevice,
  ModelManifest,
  ModelRoute,
  ComputeSettings,
  RouteResolution,
  LocalResources,
  SourceTestResult,
  CloudSyncResult,
} from "@homepilot/types";

export interface ImageJobInput {
  model?: string;
  prompt: string;
  negativePrompt?: string;
  width?: number;
  height?: number;
  steps?: number;
  seed?: number;
}

export interface VideoJobInput {
  model?: string;
  prompt?: string;
  image?: string;
}

/** Port: each app injects its event transport (SSE / polyfill / polling). */
export interface EventTransport {
  subscribe(url: string, onEvent: (event: JobEvent) => void): () => void;
}

export interface ComputeClient {
  // Wave A — generation jobs
  createImageJob(input: ImageJobInput): Promise<Job>;
  createVideoJob(input: VideoJobInput): Promise<Job>;
  getJobStatus(id: string): Promise<Job>;
  subscribeToJobEvents(
    id: string,
    onEvent: (event: JobEvent) => void,
    transport: EventTransport,
  ): () => void;
  getComputeStatus(): Promise<ComputeStatus>;
  // Wave B / Batch 8 — device sharing
  listUserDevices(): Promise<Device[]>;
  getDevicePolicy(deviceId: string): Promise<SupplierPolicy>;
  setDevicePolicy(deviceId: string, policy: Partial<SupplierPolicy>): Promise<SupplierPolicy>;

  // PR 2/3 — Compute Sources & Routing admin (/compute/admin/*)
  listComputeSources(): Promise<ComputeSource[]>;
  /** Upsert a source. Pass `credential` to store a secret out-of-band (write-only). */
  upsertComputeSource(
    source: Partial<ComputeSource> & { id: string; credential?: string },
  ): Promise<ComputeSource>;
  deleteComputeSource(id: string): Promise<void>;
  setSourceCredential(id: string, credential: string): Promise<{ credentialRef: string }>;
  testComputeSource(id: string): Promise<SourceTestResult>;

  listComputeDevices(sourceId?: string): Promise<ComputeDevice[]>;
  getLocalResources(): Promise<LocalResources>;
  /** Pull paired devices + advertised models from OllaBridge Cloud into the registry. */
  syncFromCloud(): Promise<CloudSyncResult>;

  listModelManifests(): Promise<ModelManifest[]>;
  upsertModelManifest(manifest: ModelManifest): Promise<ModelManifest>;
  deleteModelManifest(id: string): Promise<void>;

  listRoutes(): Promise<ModelRoute[]>;
  upsertRoute(route: ModelRoute): Promise<ModelRoute>;
  deleteRoute(modality: string, modelId: string): Promise<void>;

  getComputeSettings(): Promise<ComputeSettings>;
  putComputeSettings(patch: Partial<ComputeSettings>): Promise<ComputeSettings>;

  resolveRoute(modality: string, modelId?: string): Promise<RouteResolution>;
}

export function createComputeClient(api: ApiClient): ComputeClient {
  // The HTTP API speaks snake_case; @homepilot/types is camelCase. Normalize
  // responses in one place so every app gets correctly-shaped objects, while
  // requests are snake_case via toSnake(). This is the value of the SSOT: the
  // wire/representation seam lives here, not duplicated per app.
  const get = <T>(path: string) => api.get<unknown>(path).then((r) => camelize(r) as T);
  const post = <T>(path: string, body?: unknown) =>
    api.post<unknown>(path, body).then((r) => camelize(r) as T);
  const put = <T>(path: string, body?: unknown) =>
    api.put<unknown>(path, body).then((r) => camelize(r) as T);
  const del = (path: string) => api.del<unknown>(path).then(() => undefined);

  return {
    createImageJob: (input) => post<Job>("/v1/images/generations", toSnake(input)),
    createVideoJob: (input) => post<Job>("/v1/videos/generations", toSnake(input)),
    getJobStatus: (id) => get<Job>(`/v1/jobs/${id}`),
    subscribeToJobEvents: (id, onEvent, transport) =>
      transport.subscribe(`${api.baseUrl}/v1/jobs/${id}/events`, onEvent),
    getComputeStatus: () => get<ComputeStatus>("/compute/status"),
    listUserDevices: () => get<Device[]>("/v1/devices"),
    getDevicePolicy: (deviceId) => get<SupplierPolicy>(`/v1/devices/${deviceId}/policy`),
    setDevicePolicy: (deviceId, policy) =>
      put<SupplierPolicy>(`/v1/devices/${deviceId}/policy`, toSnake(policy)),

    // --- Compute admin ---
    listComputeSources: () =>
      get<{ sources: ComputeSource[] }>("/compute/admin/sources").then((r) => r.sources),
    upsertComputeSource: (source) =>
      post<{ source: ComputeSource }>("/compute/admin/sources", deepSnake(source)).then(
        (r) => r.source,
      ),
    deleteComputeSource: (id) => del(`/compute/admin/sources/${encodeURIComponent(id)}`),
    setSourceCredential: (id, credential) =>
      post<{ credentialRef: string }>(
        `/compute/admin/sources/${encodeURIComponent(id)}/credential`,
        { credential },
      ),
    testComputeSource: (id) =>
      post<SourceTestResult>(`/compute/admin/sources/${encodeURIComponent(id)}/test`),

    listComputeDevices: (sourceId) =>
      get<{ devices: ComputeDevice[] }>(
        `/compute/admin/devices${sourceId ? `?source_id=${encodeURIComponent(sourceId)}` : ""}`,
      ).then((r) => r.devices),
    getLocalResources: () => get<LocalResources>("/v1/system/resources"),
    syncFromCloud: () => post<CloudSyncResult>("/compute/admin/sync"),

    listModelManifests: () =>
      get<{ models: ModelManifest[] }>("/compute/admin/models").then((r) => r.models),
    upsertModelManifest: (manifest) =>
      post<{ model: ModelManifest }>("/compute/admin/models", deepSnake(manifest)).then(
        (r) => r.model,
      ),
    deleteModelManifest: (id) => del(`/compute/admin/models/${encodeURIComponent(id)}`),

    listRoutes: () =>
      get<{ routes: ModelRoute[] }>("/compute/admin/routes").then((r) => r.routes),
    upsertRoute: (route) =>
      post<{ route: ModelRoute }>("/compute/admin/routes", deepSnake(route)).then(
        (r) => r.route,
      ),
    deleteRoute: (modality, modelId) =>
      del(
        `/compute/admin/routes/${encodeURIComponent(modality)}/${encodeURIComponent(modelId)}`,
      ),

    getComputeSettings: () =>
      get<{ settings: ComputeSettings }>("/compute/admin/settings").then((r) => r.settings),
    putComputeSettings: (patch) =>
      put<{ settings: ComputeSettings }>("/compute/admin/settings", deepSnake(patch)).then(
        (r) => r.settings,
      ),

    resolveRoute: (modality, modelId) =>
      get<RouteResolution>(
        `/compute/admin/resolve?modality=${encodeURIComponent(modality)}` +
          (modelId ? `&model_id=${encodeURIComponent(modelId)}` : ""),
      ),
  };
}

const toCamel = (key: string): string =>
  key.replace(/_([a-z0-9])/g, (_m, c: string) => c.toUpperCase());

/** Recursively rewrite object keys snake_case → camelCase (values untouched). */
function camelize(value: unknown): unknown {
  if (Array.isArray(value)) return value.map(camelize);
  if (value && typeof value === "object") {
    const out: Record<string, unknown> = {};
    for (const [k, v] of Object.entries(value as Record<string, unknown>)) {
      out[toCamel(k)] = camelize(v);
    }
    return out;
  }
  return value;
}

/** Shallow camelCase → snake_case for request bodies (the API speaks snake). */
function toSnake(obj: object): Record<string, unknown> {
  const out: Record<string, unknown> = {};
  for (const [key, value] of Object.entries(obj)) {
    if (value === undefined) continue;
    out[key.replace(/[A-Z]/g, (m) => `_${m.toLowerCase()}`)] = value;
  }
  return out;
}

const snakeKey = (key: string): string => key.replace(/[A-Z]/g, (m) => `_${m.toLowerCase()}`);

/** Recursive camelCase → snake_case for nested request bodies (e.g. compute
 * settings with per-modality defaults). Arrays and primitives pass through. */
function deepSnake(value: unknown): unknown {
  if (Array.isArray(value)) return value.map(deepSnake);
  if (value && typeof value === "object") {
    const out: Record<string, unknown> = {};
    for (const [k, v] of Object.entries(value as Record<string, unknown>)) {
      if (v === undefined) continue;
      out[snakeKey(k)] = deepSnake(v);
    }
    return out;
  }
  return value;
}