/**
 * Installation-scoped host operations that must not impersonate an HTTP administrator.
 * This command runs only through `docker compose exec core`; it never accepts credentials,
 * headers, paths, or arbitrary code from the caller.
 */
import { pathToFileURL } from "node:url";
import { join } from "node:path";
import { loadConfig, type AppConfig } from "./config.js";
import { rolesToPermissions } from "./auth/config.js";
import type { PrincipalContext } from "./auth/principal.js";
import { createPiModelLister } from "./pi/list-models.js";
import { createPiManagement } from "./pi/management.js";
import { effectiveSettings } from "./routes/settings.js";
import { MaintenanceBarrier } from "./runtime/maintenance-gate.js";
import { loadSettings } from "./settings/settings-store.js";
import { ThtRunner, type SessionRow } from "./tht/tht-runner.js";
import { WorkspaceRegistry } from "./workspaces/registry.js";
import { WorkspaceSecretStore } from "./workspaces/secret-store.js";

type OperatorAction = "maintenance-activate" | "maintenance-deactivate" | "maintenance-status"
  | "session-inventory" | "workflow-doctor" | "workspace-integrity"
  | "pi-options" | "pi-test" | "effective-settings";

const lifecyclePrincipal: PrincipalContext = {
  issuer: "tht-operator-command",
  subject: "installation-lifecycle",
  displayName: "Installation lifecycle",
  roles: ["admin"],
  permissions: rolesToPermissions(["admin"]),
  isAdmin: true,
};

function operatorRunner(config: AppConfig): ThtRunner {
  const workspaceSecretStore = new WorkspaceSecretStore({
    root: config.workspaceSecretStoreRoot,
    runtimeRoot: config.workspaceSecretRuntimeRoot,
    installationId: config.workspaceRegistry.installationId,
  });
  return new ThtRunner({
    thtBin: config.thtBin,
    harnessDir: config.harnessDir,
    configPath: process.env.THT_CONFIG ?? "config/tht.yaml",
    dataRoot: config.dataRoot,
    runtimeSnapshotRoot: join(config.workspaceRegistry.root, "snapshots", "runtime"),
    secretRoots: config.workspaceRegistry.secretRoots,
    secretsFile: config.secretsFile,
    secretFiles: config.secretFiles,
    workspaceSecretStore,
    semanticRuntime: {
      internalQdrantUrl: config.internalQdrantUrl,
      internalEmbeddingUrl: config.internalEmbeddingUrl,
      internalEmbeddingModel: config.internalEmbeddingModel,
      internalEmbeddingDimensions: config.internalEmbeddingDimensions,
    },
  }).withPrincipal(lifecyclePrincipal);
}

async function sessionInventory(config: AppConfig): Promise<Array<Pick<SessionRow, "status" | "archived">>> {
  const registry = new WorkspaceRegistry(config.workspaceRegistry);
  const revisions = await registry.listRetainedSnapshots();
  const runner = operatorRunner(config);
  const sessions = new Map<string, SessionRow>();
  for (const revision of revisions) {
    for (const session of await runner.sessionList(revision.snapshotPath)) sessions.set(session.id, session);
  }
  return [...sessions.values()].map(({ status, archived }) => ({ status, archived: archived === true }));
}

async function workflowDiagnostics(config: AppConfig): Promise<{ ready: true; workspaces: number }> {
  const registry = new WorkspaceRegistry(config.workspaceRegistry);
  const revisions = await registry.listRetainedSnapshots();
  if (revisions.length === 0) throw new Error("workflow diagnostics unavailable");
  const runner = operatorRunner(config);
  for (const revision of revisions) {
    const result = await runner.run(["doctor", "--json"], revision.snapshotPath);
    let payload: unknown;
    try {
      payload = JSON.parse(result.stdout);
    } catch {
      throw new Error("workflow diagnostics failed");
    }
    if (
      result.code !== 0 || !payload || typeof payload !== "object"
      || (payload as { ok?: unknown }).ok !== true
    ) throw new Error("workflow diagnostics failed");
  }
  return { ready: true, workspaces: revisions.length };
}

async function workspaceIntegrity(config: AppConfig): Promise<{
  ready: true;
  state: "uninitialized" | "active";
  workspaces: number;
  fingerprint: string;
}> {
  const integrity = await new WorkspaceRegistry(config.workspaceRegistry).verifyStoredState();
  return { ready: true, ...integrity };
}

export async function runOperatorAction(
  action: OperatorAction,
  config: AppConfig,
): Promise<unknown> {
  if (action.startsWith("maintenance-")) {
    const barrier = new MaintenanceBarrier(config.maintenanceFile);
    if (action === "maintenance-activate") await barrier.activate();
    if (action === "maintenance-deactivate") barrier.deactivate();
    return barrier.status();
  }
  if (action === "session-inventory") return await sessionInventory(config);
  if (action === "workflow-doctor") return await workflowDiagnostics(config);
  if (action === "workspace-integrity") return await workspaceIntegrity(config);
  if (action === "effective-settings") return effectiveSettings(config, loadSettings(config));
  const service = createPiManagement(config, { listModels: createPiModelLister(config) });
  if (action === "pi-options") return await service.options();
  if (action === "pi-test") return await service.test();
  throw new Error("unsupported operator action");
}

async function main(): Promise<void> {
  const action = process.argv[2] as OperatorAction | undefined;
  if (!action || ![
    "maintenance-activate", "maintenance-deactivate", "maintenance-status", "session-inventory",
    "workflow-doctor", "workspace-integrity", "pi-options", "pi-test", "effective-settings",
  ].includes(action)) throw new Error("invalid operator action");
  const result = await runOperatorAction(action, loadConfig(process.env));
  process.stdout.write(`${JSON.stringify(result)}\n`);
}

if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
  void main().catch(() => {
    process.stderr.write("operator command failed\n");
    process.exitCode = 2;
  });
}