# hold.ludic - a recipe made by holding a button for its `hold` seconds: letting go wastes
# nothing, and it stops by itself the moment it can no longer be made

export function craft_holds(i: int) -> bool { return craft_ok(i) and CraftRecipes[i].hold > 0.0 }

# the recipe being held, or -1
export function craft_holding(crafting_st: CraftingState) -> int { return crafting_st.craft_hold_i }

# starts holding one that is made by holding and can be made now
export function craft_hold_start(crafting_st: mut CraftingState, i: int) -> bool {
  if not craft_holds(i) or not craft_can(i) { return false }
  crafting_st.craft_hold_i = i
  crafting_st.craft_hold_t = 0.0
  return true
}

export function craft_hold_stop(crafting_st: mut CraftingState) -> void {
  crafting_st.craft_hold_i = -1
  crafting_st.craft_hold_t = 0.0
}

# how far through the hold on `i` is, 0 to 1
export function craft_hold_frac(crafting_st: CraftingState, i: int) -> float {
  if crafting_st.craft_hold_i != i or not craft_holds(i) { return 0.0 }
  return Math.clamp(crafting_st.craft_hold_t / CraftRecipes[i].hold, 0.0, 1.0)
}

# `dt` real seconds of holding; true on the frame it is made
export function craft_hold_run(crafting_st: mut CraftingState, dt: float) -> bool {
  if crafting_st.craft_hold_i < 0 { return false }
  if not craft_can(crafting_st.craft_hold_i) {
    craft_hold_stop(crafting_st)
    return false
  }
  crafting_st.craft_hold_t = crafting_st.craft_hold_t + dt
  if crafting_st.craft_hold_t <= CraftRecipes[crafting_st.craft_hold_i].hold { return false }
  let i = crafting_st.craft_hold_i
  craft_hold_stop(crafting_st)
  return craft_make(crafting_st, i)
}