import { CorrectiveCommandRegistry } from "./corrective-command-registry";
import { CorrectiveCaseRunnerError, MainMutationCommand } from "./corrective-case-runner";
import { CORRECTIVE_FAMILIES, CorrectiveFamily } from "./corrective-family-runner";
import { InMemoryMainStore, runAtomicMutation } from "./corrective-main-transaction";

export interface GenericFamilyMain {
  family: CorrectiveFamily;
  value: string;
}

const VALUE = /^[A-Za-z0-9._:-]{1,128}$/u;

function payload(command: MainMutationCommand): { family: CorrectiveFamily; value: string } {
  const input = command.payload;
  if (typeof input.family !== "string" || !CORRECTIVE_FAMILIES.includes(input.family as CorrectiveFamily) || typeof input.value !== "string" || !VALUE.test(input.value) || Object.keys(input).some((key) => !["family", "value"].includes(key))) {
    throw new CorrectiveCaseRunnerError("COMMAND_MALFORMED", "family payload must contain only a bounded family and value");
  }
  return { family: input.family as CorrectiveFamily, value: input.value };
}

export function createGenericFamilyMain(family: CorrectiveFamily, value = "before", revision = 1, dirty = false): InMemoryMainStore<GenericFamilyMain> {
  return new InMemoryMainStore({ family, value }, revision, dirty, (state) => ({ ...state }));
}

export function createGenericFamilyRegistry(main: InMemoryMainStore<GenericFamilyMain>): CorrectiveCommandRegistry {
  return new CorrectiveCommandRegistry().register({
    commandType: "familySetState",
    targetKinds: ["DATABLOCK", "SCENE"],
    authorizations: ["USER_EDIT", "SYSTEM"],
    execute: async (command) => {
      const change = payload(command);
      return runAtomicMutation(main, command, (draft) => {
        if (draft.family !== change.family) throw new CorrectiveCaseRunnerError("INVALID_CONTEXT", "family does not match Main");
        const previous = draft.value;
        draft.value = change.value;
        return { delta: { family: change.family, previous, value: change.value }, persistence: { dirty: true } };
      });
    },
  });
}