feat: trigger logic implementation

impostor.inc

@@ -9,6 +9,7 @@ logic/logic.meter.lua
 logic/logic.focus.lua
 logic/logic.day.lua
 logic/logic.timer.lua
+logic/logic.trigger.lua
 logic/logic.minigame.lua
 system/system.ui.lua
 audio/audio.manager.lua

inc/init/init.context.lua

@@ -18,6 +18,7 @@ Context = {}
 --- * minigame_button_mash (table) Button mash minigame state (see Minigame.get_default_button_mash).<br/>
 --- * minigame_rhythm (table) Rhythm minigame state (see Minigame.get_default_rhythm).<br/>
 --- * meters (table) Meter values (see Meter.get_initial).<br/>
+--- * triggers (table) Active trigger runtime state, keyed by trigger ID.<br/>
 --- * stat_screen_active (boolean) Whether the stat screen overlay is currently shown.<br/>
 --- * game (table) Current game progress state. Contains: `current_screen` (string) active screen ID, `current_situation` (string|nil) active situation ID.<br/>
 function Context.initial_data()
@@ -35,6 +36,7 @@ function Context.initial_data()
     minigame_rhythm = {},
     meters = Meter.get_initial(),
     timer = Timer.get_initial(),
+    triggers = {},
     game = {
       current_screen = "home",
       current_situation = nil,

inc/init/init.module.lua

@@ -13,4 +13,5 @@ Sprite = {}
 Audio = {}
 Focus = {}
 Day = {}
-Timer = {}
+Timer = {}
+Trigger = {}

inc/logic/logic.trigger.lua

@@ -0,0 +1,135 @@
+--- @section Trigger
+local triggers = {}
+
+--- @within Trigger
+--- @param trigger table The trigger data table.
+--- @param trigger.id string Unique trigger identifier.
+--- @param trigger.duration number Duration in frames before the trigger fires.
+--- @param[opt] trigger.on_start function Called when the trigger starts. Defaults to noop.
+--- @param[opt] trigger.on_stop function Called when the trigger fires or is manually stopped. Defaults to noop.
+--- @param[opt] trigger.repeating boolean If true, trigger restarts after firing. Defaults to false.
+function Trigger.register(trigger)
+  if not trigger or not trigger.id then
+    trace("Error: Invalid trigger registered (missing id)!")
+    return
+  end
+  if not trigger.duration or trigger.duration <= 0 then
+    trace("Error: Invalid trigger registered (missing or invalid duration)!")
+    return
+  end
+
+  if not trigger.on_start then
+    trigger.on_start = function() end
+  end
+  if not trigger.on_stop then
+    trigger.on_stop = function() end
+  end
+  if trigger.repeating == nil then
+    trigger.repeating = false
+  end
+  if triggers[trigger.id] then
+    trace("Warning: Overwriting trigger with id: " .. trigger.id)
+  end
+  triggers[trigger.id] = trigger
+end
+
+--- @within Trigger
+--- @param id string The trigger ID.
+--- @return table|nil result The trigger definition or nil.
+function Trigger.get_by_id(id)
+  return triggers[id]
+end
+
+--- @within Trigger
+--- @return table result All trigger definitions keyed by ID.
+function Trigger.get_all()
+  return triggers
+end
+
+--- @within Trigger
+--- @param id string The trigger ID.
+--- @return boolean active True if the trigger is running.
+function Trigger.is_active(id)
+  if not Context or not Context.triggers then return false end
+  return Context.triggers[id] ~= nil
+end
+
+--- If already active, restarts from 0.
+--- @within Trigger
+--- @param id string The trigger ID.
+function Trigger.start(id)
+  if not Context or not Context.triggers then return end
+  local trigger = triggers[id]
+  if not trigger then
+    trace("Error: Cannot start unknown trigger: " .. tostring(id))
+    return
+  end
+
+  Context.triggers[id] = { elapsed = 0 }
+  trigger.on_start()
+end
+
+--- @within Trigger
+--- @param id string The trigger ID.
+function Trigger.stop(id)
+  if not Context or not Context.triggers then return end
+  local trigger = triggers[id]
+  if not trigger then
+    trace("Error: Cannot stop unknown trigger: " .. tostring(id))
+    return
+  end
+  if not Context.triggers[id] then return end
+
+  Context.triggers[id] = nil
+  trigger.on_stop()
+end
+
+--- Resets elapsed time to 0 without calling handlers. No-op if inactive.
+--- @within Trigger
+--- @param id string The trigger ID.
+function Trigger.reset(id)
+  if not Context or not Context.triggers then return end
+  if not triggers[id] then
+    trace("Error: Cannot reset unknown trigger: " .. tostring(id))
+    return
+  end
+  if not Context.triggers[id] then return end
+
+  Context.triggers[id].elapsed = 0
+end
+
+--- Pauses during minigames.
+--- @within Trigger
+function Trigger.update()
+  if not Context or not Context.game_in_progress or not Context.triggers then return end
+
+  local in_minigame = string.find(Window.get_current_id(), "^minigame_") ~= nil
+  if in_minigame then return end
+
+  local fired = {}
+  for id, state in pairs(Context.triggers) do
+    local trigger = triggers[id]
+    if trigger then
+      state.elapsed = state.elapsed + 1
+      if state.elapsed >= trigger.duration then
+        table.insert(fired, id)
+      end
+    else
+      table.insert(fired, id)
+    end
+  end
+
+  for _, id in ipairs(fired) do
+    local trigger = triggers[id]
+    if trigger then
+      trigger.on_stop()
+      if trigger.repeating then
+        Context.triggers[id] = { elapsed = 0 }
+      else
+        Context.triggers[id] = nil
+      end
+    else
+      Context.triggers[id] = nil
+    end
+  end
+end

inc/system/system.main.lua

@@ -23,6 +23,7 @@ function TIC()
   end
   Meter.update()
   Timer.update()
+  Trigger.update()
   if Context.game_in_progress then
     Meter.draw()
     Timer.draw()