local playArea = require("core/PlayAreaApi")
local tokenSpawnTracker = require("core/token/TokenSpawnTrackerApi")

local ENCOUNTER_DECK_AREA = {
  upperLeft = { x = 0.9, z = 0.42 },
  lowerRight = { x = 0.86, z = 0.38 },
}
local ENCOUNTER_DISCARD_AREA = {
  upperLeft = { x = 1.62, z = 0.42 },
  lowerRight = { x = 1.58, z = 0.38 },
}

local currentScenario
-- we use this to turn off collision handling until onLoad() is complete
local COLLISION_ENABLED = false

function onLoad(saveState)
  if saveState ~= nil then
    local loadedState = JSON.decode(saveState) or { }
    currentScenario = loadedState.currentScenario
  end
  COLLISION_ENABLED = true
end

function onSave()
  return JSON.encode({
    currentScenario = currentScenario
  })
end

-- TTS event handler.  Handles scenario name event triggering and encounter card token resets.
function onCollisionEnter(collisionInfo)
  if not COLLISION_ENABLED then
    return
  end
  local object = collisionInfo.collision_object
  if object.getName() == "Scenario" then
    if currentScenario ~= object.getDescription() then
      currentScenario = object.getDescription()
      fireScenarioChangedEvent()
    end
  end

  local localPos = self.positionToLocal(object.getPosition())
  if inArea(localPos, ENCOUNTER_DECK_AREA) or inArea(localPos, ENCOUNTER_DISCARD_AREA) then
    tokenSpawnTracker.resetTokensSpawned(object.getGUID())
  end
end

-- Listens for cards entering the encounter deck or encounter discard, and resets the spawn state
-- for the cards when they do.
function onObjectEnterContainer(container, object)
  local localPos = self.positionToLocal(container.getPosition())
  if inArea(localPos, ENCOUNTER_DECK_AREA) or inArea(localPos, ENCOUNTER_DISCARD_AREA) then
    tokenSpawnTracker.resetTokensSpawned(object.getGUID())
  end
end

function fireScenarioChangedEvent()
  Wait.frames(function() Global.call('titleSplash', currentScenario) end, 20)
  playArea.onScenarioChanged(currentScenario)
end

-- Simple method to check if the given point is in a specified area.  Local use only,
---@param point Vector.  Point to check, only x and z values are relevant
---@param bounds Table.  Defined area to see if the point is within.  See MAIN_PLAY_AREA for sample
--     bounds definition.
---@return Boolean.  True if the point is in the area defined by bounds
function inArea(point, bounds)
  return (point.x < bounds.upperLeft.x
      and point.x > bounds.lowerRight.x
      and point.z < bounds.upperLeft.z
      and point.z > bounds.lowerRight.z)
end