local path = ...
if not path:find("init") then
  require(path .. ".datastructures.string")
  require(path .. ".datastructures.table")
  require(path .. ".external")
  require(path .. ".graphics.graphics")
  require(path .. ".game.object")
  require(path .. ".system")
  require(path .. ".datastructures.graph")
  require(path .. ".datastructures.grid")
  require(path .. ".game.gameobject")
  require(path .. ".game.group")
  require(path .. ".game.state")
  require(path .. ".game.physics")
  require(path .. ".game.steering")
  require(path .. ".graphics.animation")
  require(path .. ".graphics.camera")
  require(path .. ".graphics.canvas")
  require(path .. ".graphics.color")
  require(path .. ".graphics.font")
  require(path .. ".graphics.image")
  require(path .. ".graphics.shader")
  require(path .. ".graphics.text")
  require(path .. ".graphics.tileset")
  require(path .. ".map.solid")
  require(path .. ".map.tilemap")
  require(path .. ".math.polygon")
  require(path .. ".math.chain")
  require(path .. ".math.circle")
  require(path .. ".math.line")
  require(path .. ".math.math")
  require(path .. ".math.random")
  require(path .. ".math.rectangle")
  require(path .. ".math.spring")
  require(path .. ".math.triangle")
  require(path .. ".math.vector")
  require(path .. ".game.trigger")
  require(path .. ".game.input")
  require(path .. ".sound")
  require(path .. ".game.parent")
  require(path .. ".game.springs")
  require(path .. ".game.flashes")
  require(path .. ".game.hitfx")
end

function engine_run(config)
  if not web then
    love.filesystem.setIdentity(config.game_name)

    local _, _, flags = love.window.getMode()
    local window_width, window_height = love.window.getDesktopDimensions(flags.display)
    if config.window_width ~= 'max' then window_width = config.window_width end
    if config.window_height ~= 'max' then window_height = config.window_height end

    local limits = love.graphics.getSystemLimits()
    local anisotropy = limits.anisotropy
    msaa = limits.canvasmsaa
    if config.msaa ~= 'max' then msaa = config.msaa end
    if config.anisotropy ~= 'max' then anisotropy = config.anisotropy end

    gw, gh = config.game_width or 480, config.game_height or 270
    sx, sy = window_width/(config.game_width or 480), window_height/(config.game_height or 270)
    ww, wh = window_width, window_height

    love.window.setMode(window_width, window_height, {fullscreen = config.fullscreen, vsync = config.vsync, msaa = msaa or 0, display = config.display})
    love.window.setTitle(config.game_name)

  else
    gw, gh = config.game_width or 480, config.game_height or 270 
    sx, sy = 2, 2
    ww, wh = 960, 540
  end

  love.graphics.setBackgroundColor(0, 0, 0, 1)
  love.graphics.setColor(1, 1, 1, 1)
  love.joystick.loadGamepadMappings("engine/gamecontrollerdb.txt")
  graphics.set_line_style(config.line_style or "rough")
  graphics.set_default_filter(config.default_filter or "nearest", config.default_filter or "nearest", anisotropy or 0)

  combine = Shader("default.vert", "combine.frag")
  replace = Shader("default.vert", "replace.frag")
  full_combine = Shader("default.vert", "full_combine.frag")

  input = Input()
  input:bind_all()
  for k, v in pairs(config.input or {}) do input:bind(k, v) end
  random = Random()
  trigger = Trigger()
  camera = Camera(gw/2, gh/2)
  mouse = Vector(0, 0)
  last_mouse = Vector(0, 0)
  mouse_dt = Vector(0, 0)
  init()

  if love.timer then love.timer.step() end

  if not web then
    _, _, flags = love.window.getMode()
    fixed_dt = 1/flags.refreshrate
  else fixed_dt = 1/60 end

  local accumulator = fixed_dt
  local dt = 0
  frame, time = 0, 0

  if not web then refresh_rate = flags.refreshrate
  else refresh_rate = 60 end

  return function()
    if love.event then
      love.event.pump()
      for name, a, b, c, d, e, f in love.event.poll() do
        if name == "quit" then
          if not love.quit or not love.quit() then
            return a or 0
          end
        elseif name == "keypressed" then input.keyboard_state[a] = true; input.last_key_pressed = a
        elseif name == "keyreleased" then input.keyboard_state[a] = false
        elseif name == "mousepressed" then input.mouse_state[input.mouse_buttons[c]] = true; input.last_key_pressed = input.mouse_buttons[c]
        elseif name == "mousereleased" then input.mouse_state[input.mouse_buttons[c]] = false
        elseif name == "wheelmoved" then if b == 1 then input.mouse_state.wheel_up = true elseif b == -1 then input.mouse_state.wheel_down = true end
        elseif name == "gamepadpressed" then input.gamepad_state[input.index_to_gamepad_button[b]] = true; input.last_key_pressed = input.index_to_gamepad_button[b]
        elseif name == "gamepadreleased" then input.gamepad_state[input.index_to_gamepad_button[b]] = false
        elseif name == "gamepadaxis" then input.gamepad_axis[input.index_to_gamepad_axis[b]] = c
        elseif name == "textinput" then input:textinput(a) end
      end
    end

    if love.timer then dt = love.timer.step() end

    accumulator = accumulator + dt
    while accumulator >= fixed_dt do
      frame = frame + 1
      input:update(fixed_dt)
      trigger:update(fixed_dt)
      camera:update(fixed_dt)
      local mx, my = love.mouse.getPosition()
      mouse:set(mx/sx, my/sy)
      mouse_dt:set(mouse.x - last_mouse.x, mouse.y - last_mouse.y)
      update(fixed_dt)
      system.update()
      input.last_key_pressed = nil
      last_mouse:set(mouse.x, mouse.y)
      accumulator = accumulator - fixed_dt
      time = time + fixed_dt
    end

    if love.graphics and love.graphics.isActive() then
      love.graphics.origin()
      love.graphics.clear(love.graphics.getBackgroundColor())
      draw()
      love.graphics.present()
    end

    if love.timer then love.timer.sleep(0.001) end
  end
end