# crafting.ludic — RPG Module C: a data-driven crafting registry (#59).
#
# Recipes are content, not code: register with Craft.recipe + Craft.ingredient, so a
# game or mod adds crafting with zero code. Craft.make consumes ingredients from the
# ludic.rpg Inventory and yields the output; every step is a veto-able event.

import "ludic.rpg/inventory.ludic"

const CRAFT_MAX: int = 128
const CRAFT_ING_MAX: int = 512



event cancellable CraftRequested { e: int = 0, recipe: int = 0 }
event CraftCompleted { e: int = 0, recipe: int = 0 }

# Craft.recipe(name, out_item, out_qty) — declare a recipe; returns its id.
@Namespace(Craft) function craft_recipe(rpg_st: mut RpgState, name: pointer, out_item: pointer, out_qty: int) -> int {
  if rpg_st.recipe_n >= CRAFT_MAX { return -1 }
  let id = rpg_st.recipe_n
  rpg_st.recipe_out[id] = out_item;  rpg_st.recipe_outqty[id] = out_qty
  rpg_st.recipe_n += 1
  Dict.set(rpg_st.recipe_reg, name, id)
  return id
}
@Namespace(Craft) function craft_id(rpg_st: mut RpgState, name: pointer) -> int { return Dict.get_or(rpg_st.recipe_reg, name, -1) }
# Craft.ingredient(recipe_name, item, qty) — add an ingredient requirement.
@Namespace(Craft) function craft_ingredient(rpg_st: mut RpgState, recipe_name: pointer, item: pointer, qty: int) -> void {
  let rid = craft_id(rpg_st, recipe_name)
  if rid < 0 { return }
  if rpg_st.ing_n >= CRAFT_ING_MAX { return }
  rpg_st.ing_rid[rpg_st.ing_n] = rid;  rpg_st.ing_name[rpg_st.ing_n] = item;  rpg_st.ing_qty[rpg_st.ing_n] = qty
  rpg_st.ing_n += 1
}

# Craft.can(e, recipe_name) — does the owner hold every ingredient?
@Namespace(Craft) function craft_can(rpg_st: mut RpgState, e: int, recipe_name: pointer) -> int {
  let rid = craft_id(rpg_st, recipe_name)
  if rid < 0 { return 0 }
  var i = 0
  while i < rpg_st.ing_n {
    if rpg_st.ing_rid[i] == rid {
      if Inventory.count(e, rpg_st.ing_name[i]) < rpg_st.ing_qty[i] { return 0 }
    }
    i += 1
  }
  return 1
}

# Craft.make(e, recipe_name) — consume ingredients + produce output; 1 on success.
@Namespace(Craft) function craft_make(rpg_st: mut RpgState, e: int, recipe_name: pointer) -> int {
  let rid = craft_id(rpg_st, recipe_name)
  if rid < 0 { return 0 }
  if craft_can(rpg_st, e, recipe_name) == 0 { return 0 }
  if emit CraftRequested(e: e, recipe: rid) != 0 { return 0 }
  var i = 0
  while i < rpg_st.ing_n {
    if rpg_st.ing_rid[i] == rid { Inventory.remove(e, rpg_st.ing_name[i], rpg_st.ing_qty[i]) }
    i += 1
  }
  Inventory.add(e, rpg_st.recipe_out[rid], rpg_st.recipe_outqty[rid])
  emit CraftCompleted(e: e, recipe: rid)
  return 1
}