import type { OpenClawConfig } from "../../config/config.js";
import type { SandboxFsBridge } from "./fs-bridge.js";
import type { SandboxRegistryEntry } from "./registry.js";
import type { SandboxConfig, SandboxContext } from "./types.js";

export type SandboxBackendId = string;

export type SandboxBackendExecSpec = {
  argv: string[];
  env: NodeJS.ProcessEnv;
  stdinMode: "pipe-open" | "pipe-closed";
  finalizeToken?: unknown;
};

export type SandboxBackendCommandParams = {
  script: string;
  args?: string[];
  stdin?: Buffer | string;
  allowFailure?: boolean;
  signal?: AbortSignal;
};

export type SandboxBackendCommandResult = {
  stdout: Buffer;
  stderr: Buffer;
  code: number;
};

export type SandboxBackendHandle = {
  id: SandboxBackendId;
  runtimeId: string;
  runtimeLabel: string;
  workdir: string;
  env?: Record<string, string>;
  configLabel?: string;
  configLabelKind?: string;
  capabilities?: {
    browser?: boolean;
  };
  buildExecSpec(params: {
    command: string;
    workdir?: string;
    env: Record<string, string>;
    usePty: boolean;
  }): Promise<SandboxBackendExecSpec>;
  finalizeExec?: (params: {
    status: "completed" | "failed";
    exitCode: number | null;
    timedOut: boolean;
    token?: unknown;
  }) => Promise<void>;
  runShellCommand(params: SandboxBackendCommandParams): Promise<SandboxBackendCommandResult>;
  createFsBridge?: (params: { sandbox: SandboxContext }) => SandboxFsBridge;
};

export type SandboxBackendRuntimeInfo = {
  running: boolean;
  actualConfigLabel?: string;
  configLabelMatch: boolean;
};

export type SandboxBackendManager = {
  describeRuntime(params: {
    entry: SandboxRegistryEntry;
    config: OpenClawConfig;
    agentId?: string;
  }): Promise<SandboxBackendRuntimeInfo>;
  removeRuntime(params: {
    entry: SandboxRegistryEntry;
    config: OpenClawConfig;
    agentId?: string;
  }): Promise<void>;
};

export type CreateSandboxBackendParams = {
  sessionKey: string;
  scopeKey: string;
  workspaceDir: string;
  agentWorkspaceDir: string;
  cfg: SandboxConfig;
};

export type SandboxBackendFactory = (
  params: CreateSandboxBackendParams,
) => Promise<SandboxBackendHandle>;

export type SandboxBackendRegistration =
  | SandboxBackendFactory
  | {
      factory: SandboxBackendFactory;
      manager?: SandboxBackendManager;
    };

type RegisteredSandboxBackend = {
  factory: SandboxBackendFactory;
  manager?: SandboxBackendManager;
};

const SANDBOX_BACKEND_FACTORIES = new Map<SandboxBackendId, RegisteredSandboxBackend>();

function normalizeSandboxBackendId(id: string): SandboxBackendId {
  const normalized = id.trim().toLowerCase();
  if (!normalized) {
    throw new Error("Sandbox backend id must not be empty.");
  }
  return normalized;
}

export function registerSandboxBackend(
  id: string,
  registration: SandboxBackendRegistration,
): () => void {
  const normalizedId = normalizeSandboxBackendId(id);
  const resolved = typeof registration === "function" ? { factory: registration } : registration;
  const previous = SANDBOX_BACKEND_FACTORIES.get(normalizedId);
  SANDBOX_BACKEND_FACTORIES.set(normalizedId, resolved);
  return () => {
    if (previous) {
      SANDBOX_BACKEND_FACTORIES.set(normalizedId, previous);
      return;
    }
    SANDBOX_BACKEND_FACTORIES.delete(normalizedId);
  };
}

export function getSandboxBackendFactory(id: string): SandboxBackendFactory | null {
  return SANDBOX_BACKEND_FACTORIES.get(normalizeSandboxBackendId(id))?.factory ?? null;
}

export function getSandboxBackendManager(id: string): SandboxBackendManager | null {
  return SANDBOX_BACKEND_FACTORIES.get(normalizeSandboxBackendId(id))?.manager ?? null;
}

export function requireSandboxBackendFactory(id: string): SandboxBackendFactory {
  const factory = getSandboxBackendFactory(id);
  if (factory) {
    return factory;
  }
  throw new Error(
    [
      `Sandbox backend "${id}" is not registered.`,
      "Load the plugin that provides it, or set agents.defaults.sandbox.backend=docker.",
    ].join("\n"),
  );
}

import { createDockerSandboxBackend, dockerSandboxBackendManager } from "./docker-backend.js";
import { createSshSandboxBackend, sshSandboxBackendManager } from "./ssh-backend.js";

registerSandboxBackend("docker", {
  factory: createDockerSandboxBackend,
  manager: dockerSandboxBackendManager,
});

registerSandboxBackend("ssh", {
  factory: createSshSandboxBackend,
  manager: sshSandboxBackendManager,
});