// progression.ts — character level, ascension, and skill upgrade
//
// All upgrade cost validation is server-side. Costs come from content data
// (content/data/characters/), not hardcoded constants, so they can be tuned
// without code changes.
//
// Progression layers (per spec):
//   1. Character level (capped per ascension tier)
//   2. Ascension / limit break (unlocks higher level cap, costs materials)
//   3. Skill upgrades (costs knowledge + gold)
//   4. Equipment (deferred beyond PoC)
//   5. Bond / familiarity (tracked; mechanical outputs deferred)
//   6. Assignment mastery (tracked in village module)

export function rpcLevelUp(
  ctx: nkruntime.Context,
  logger: nkruntime.Logger,
  nk: nkruntime.Nakama,
  payload: string
): string {
  // TODO PR 6: validate level-up cost, deduct resources, write new level
  const req = JSON.parse(payload || "{}");
  logger.info(`progression/level_up stub: char=${req.character_id} user=${ctx.userId}`);

  return JSON.stringify({
    ok: false,
    error: "not_implemented",
    message: "Level-up is stubbed. Implement in PR 6.",
    character_id: req.character_id,
  });
}

export function rpcAscend(
  ctx: nkruntime.Context,
  logger: nkruntime.Logger,
  nk: nkruntime.Nakama,
  payload: string
): string {
  // TODO PR 6: validate ascension materials, raise tier, uncap level
  const req = JSON.parse(payload || "{}");
  logger.info(`progression/ascend stub: char=${req.character_id} user=${ctx.userId}`);

  return JSON.stringify({
    ok: false,
    error: "not_implemented",
    message: "Ascension is stubbed. Implement in PR 6.",
    character_id: req.character_id,
  });
}

export function rpcUpgradeSkill(
  ctx: nkruntime.Context,
  logger: nkruntime.Logger,
  nk: nkruntime.Nakama,
  payload: string
): string {
  // TODO PR 6: validate skill upgrade cost, apply upgrade
  const req = JSON.parse(payload || "{}");
  logger.info(`progression/upgrade_skill stub: char=${req.character_id} skill=${req.skill_id} user=${ctx.userId}`);

  return JSON.stringify({
    ok: false,
    error: "not_implemented",
    message: "Skill upgrade is stubbed. Implement in PR 6.",
    character_id: req.character_id,
    skill_id: req.skill_id,
  });
}