import {
  updateCharacterActionBindings,
  updateCharacterProgression,
  type StorageLike,
} from "./accountRepository";
import { selectedCharacter, useShellStore } from "./shellStore";
import { useCombatStore } from "../game/combatStore";
import { activateCharacterUi } from "../game/uiLayoutStore";

// Reuse the character editors without mounting the dungeon's simulation bridge.
export function beginMainMenuCharacterEditing(storage?: StorageLike): (() => void) | null {
  const shell = useShellStore.getState();
  const character = selectedCharacter(shell);
  if (shell.phase !== "main-menu" || !shell.session || !character
    || character.ownerId !== shell.session.ownerId) return null;

  const ownerId = shell.session.ownerId;
  const characterId = character.id;
  useCombatStore.getState().initializeCharacter(character);
  activateCharacterUi(character);

  return useCombatStore.subscribe((combat, previous) => {
    const current = useShellStore.getState();
    const profile = selectedCharacter(current);
    if (current.phase !== "main-menu" || current.session?.ownerId !== ownerId
      || profile?.id !== characterId || profile.ownerId !== ownerId) return;
    if (combat.talentRanks === previous.talentRanks && combat.actionBindings === previous.actionBindings) return;

    try {
      let updated = profile;
      if (combat.talentRanks !== previous.talentRanks) {
        const saved = updateCharacterProgression(ownerId, characterId, {
          // Menu edits cannot award experience or alter the character's level.
          level: profile.level,
          experience: profile.experience,
          talentRanks: combat.talentRanks,
        }, storage);
        if (!saved) throw new Error("Character storage is unavailable.");
        updated = saved;
      }
      if (combat.actionBindings !== previous.actionBindings) {
        const saved = updateCharacterActionBindings(ownerId, characterId, combat.actionBindings, storage);
        if (!saved) throw new Error("Character storage is unavailable.");
        updated = saved;
      }
      useShellStore.setState((state) => ({
        characters: state.characters.map((entry) => entry.id === characterId ? updated : entry),
        notice: "",
      }));
    } catch {
      useShellStore.getState().setNotice("Could not save character changes. Check that profile storage is available and try again.");
    }
  });
}