import {
  assertCircuitGroupSubtreeSnapshot,
  type CircuitGroupSubtreeSnapshot,
} from "./circuit-group-subtree-snapshot.model.js";
import type { SerializedProjectCommand } from "./project-command.model.js";

export const circuitGroupDeleteSubtreeCommandType =
  "circuit-group.delete-subtree" as const;
export const circuitGroupRestoreSubtreeCommandType =
  "circuit-group.restore-subtree" as const;
export const circuitGroupSubtreeCommandSchemaVersion = 1 as const;

interface Payload {
  snapshot: CircuitGroupSubtreeSnapshot;
}

export interface CircuitGroupDeleteSubtreeProjectCommand
  extends SerializedProjectCommand<Payload> {
  schemaVersion: typeof circuitGroupSubtreeCommandSchemaVersion;
  type: typeof circuitGroupDeleteSubtreeCommandType;
}

export interface CircuitGroupRestoreSubtreeProjectCommand
  extends SerializedProjectCommand<Payload> {
  schemaVersion: typeof circuitGroupSubtreeCommandSchemaVersion;
  type: typeof circuitGroupRestoreSubtreeCommandType;
}

export type CircuitGroupSubtreeProjectCommand =
  | CircuitGroupDeleteSubtreeProjectCommand
  | CircuitGroupRestoreSubtreeProjectCommand;

export function createCircuitGroupDeleteSubtreeProjectCommand(
  snapshot: CircuitGroupSubtreeSnapshot
): CircuitGroupDeleteSubtreeProjectCommand {
  const command: CircuitGroupDeleteSubtreeProjectCommand = {
    schemaVersion: circuitGroupSubtreeCommandSchemaVersion,
    type: circuitGroupDeleteSubtreeCommandType,
    payload: { snapshot },
  };
  assertCircuitGroupDeleteSubtreeProjectCommand(command);
  return command;
}

export function createCircuitGroupRestoreSubtreeProjectCommand(
  snapshot: CircuitGroupSubtreeSnapshot
): CircuitGroupRestoreSubtreeProjectCommand {
  const command: CircuitGroupRestoreSubtreeProjectCommand = {
    schemaVersion: circuitGroupSubtreeCommandSchemaVersion,
    type: circuitGroupRestoreSubtreeCommandType,
    payload: { snapshot },
  };
  assertCircuitGroupRestoreSubtreeProjectCommand(command);
  return command;
}

export function assertCircuitGroupDeleteSubtreeProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is CircuitGroupDeleteSubtreeProjectCommand {
  assertCommand(command, circuitGroupDeleteSubtreeCommandType);
}

export function assertCircuitGroupRestoreSubtreeProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is CircuitGroupRestoreSubtreeProjectCommand {
  assertCommand(command, circuitGroupRestoreSubtreeCommandType);
}

function assertCommand(
  command: SerializedProjectCommand<unknown>,
  type:
    | typeof circuitGroupDeleteSubtreeCommandType
    | typeof circuitGroupRestoreSubtreeCommandType
) {
  if (
    command.schemaVersion !== circuitGroupSubtreeCommandSchemaVersion ||
    command.type !== type ||
    !isPlainObject(command.payload) ||
    Object.keys(command.payload).length !== 1
  ) {
    throw new Error("Unsupported circuit-group subtree command.");
  }
  assertCircuitGroupSubtreeSnapshot(command.payload.snapshot);
}

function isPlainObject(value: unknown): value is Record<string, unknown> {
  return value !== null && typeof value === "object" && !Array.isArray(value);
}