import { realExcluded } from "./error-map.mjs";

export const LIMITS = Object.freeze({
  max_command_bytes: 65536,
  max_snapshot_bytes: 1048576,
  max_tick_step: 1000000,
  max_event_records: 256,
  max_workspace_path_bytes: 1024,
  max_workspace_file_bytes: 64 * 1024 * 1024,
});

export const COMMANDS = Object.freeze([
  "SESSION_ATTACH", "LOAD_WORKSPACE", "COMMAND", "SIM_STEP", "SNAPSHOT_REQUEST",
  "PROGRAM_PAUSE", "PROGRAM_RESUME", "CHECKPOINT", "RECOVER", "DESTROY",
]);

export const EXCLUSIONS = Object.freeze([
  realExcluded("real_hardware", "browser_has_no_direct_machine_control", "digital_twin"),
  realExcluded("linux_realtime_kernel", "wasm_worker_uses_logical_ticks", "fixed_tick_scheduler"),
  realExcluded("host_device_access", "browser_sandbox_disallows_arbitrary_devices", "virtual_device_adapter"),
]);

export function capabilities(contextId) {
  return {
    context_id: contextId,
    abi: 1,
    protocol: 1,
    snapshot: 1,
    event: 1,
    workspace: 1,
    commands: [...COMMANDS],
    streams: ["STATE_SNAPSHOT", "EVENT", "ALARM"],
    limits: { ...LIMITS },
    exclusions: EXCLUSIONS.map((entry) => ({ ...entry })),
  };
}

export function validateLimit(name, value) {
  if (!(name in LIMITS)) return { status: "blocked", code: "capability_unknown_limit", message_key: "capability.unknown_limit", limit: name };
  if (!Number.isSafeInteger(value) || value < 0) return { status: "blocked", code: "capability_invalid_value", message_key: "capability.invalid_value", limit: name, value };
  if (value > LIMITS[name]) return { status: "blocked", code: "capability_limit_exceeded", message_key: "capability.limit_exceeded", limit: name, value, maximum: LIMITS[name] };
  return { status: "accepted", limit: name, value, maximum: LIMITS[name] };
}