Arena = Object:extend()
Arena:implement(State)
Arena:implement(GameObject)
function Arena:init(name)
  self:init_state(name)
  self:init_game_object()
end


function Arena:on_enter(from, level, units)
  self.hfx:add('condition1', 1)
  self.hfx:add('condition2', 1)
  self.level = level or 1
  self.units = units

  self.floor = Group()
  self.main = Group():set_as_physics_world(32, 0, 0, {'player', 'enemy', 'projectile', 'enemy_projectile'})
  self.post_main = Group()
  self.effects = Group()
  self.ui = Group()
  self.main:disable_collision_between('player', 'player')
  self.main:disable_collision_between('player', 'projectile')
  self.main:disable_collision_between('player', 'enemy_projectile')
  self.main:disable_collision_between('projectile', 'projectile')
  self.main:disable_collision_between('projectile', 'enemy_projectile')
  self.main:disable_collision_between('projectile', 'enemy')
  self.main:disable_collision_between('enemy_projectile', 'enemy')
  self.main:disable_collision_between('enemy_projectile', 'enemy_projectile')
  self.main:enable_trigger_between('projectile', 'enemy')
  self.main:enable_trigger_between('enemy_projectile', 'player')

  self.damage_dealt = 0
  self.damage_taken = 0
  self.main_slow_amount = 1
  self.enemies = {Seeker}
  self.color = self.color or fg[0]

  -- Spawn solids and player
  self.x1, self.y1 = gw/2 - 0.8*gw/2, gh/2 - 0.8*gh/2
  self.x2, self.y2 = gw/2 + 0.8*gw/2, gh/2 + 0.8*gh/2
  self.spawn_points = {
    {x = self.x1 + 32, y = self.y1 + 32, r = math.pi/4},
    {x = self.x1 + 32, y = self.y2 - 32, r = -math.pi/4},
    {x = self.x2 - 32, y = self.y1 + 32, r = 3*math.pi/4},
    {x = self.x2 - 32, y = self.y2 - 32, r = -3*math.pi/4},
    {x = gw/2, y = gh/2, r = random:float(0, 2*math.pi)}
  }
  self.spawn_offsets = {{x = -12, y = -12}, {x = 12, y = -12}, {x = 12, y = 12}, {x = -12, y = 12}, {x = 0, y = 0}}
  self.last_spawn_enemy_time = love.timer.getTime()

  Wall{group = self.main, vertices = math.to_rectangle_vertices(-40, -40, self.x1, gh + 40), color = bg[-1]}
  Wall{group = self.main, vertices = math.to_rectangle_vertices(self.x2, -40, gw + 40, gh + 40), color = bg[-1]}
  Wall{group = self.main, vertices = math.to_rectangle_vertices(self.x1, -40, self.x2, self.y1), color = bg[-1]}
  Wall{group = self.main, vertices = math.to_rectangle_vertices(self.x1, self.y2, self.x2, gh + 40), color = bg[-1]}
  WallCover{group = self.post_main, vertices = math.to_rectangle_vertices(-40, -40, self.x1, gh + 40), color = bg[-1]}
  WallCover{group = self.post_main, vertices = math.to_rectangle_vertices(self.x2, -40, gw + 40, gh + 40), color = bg[-1]}
  WallCover{group = self.post_main, vertices = math.to_rectangle_vertices(self.x1, -40, self.x2, self.y1), color = bg[-1]}
  WallCover{group = self.post_main, vertices = math.to_rectangle_vertices(self.x1, self.y2, self.x2, gh + 40), color = bg[-1]}

  for i, unit in ipairs(units) do
    if i == 1 then
      self.player = Player{group = self.main, x = gw/2, y = gh/2, leader = true, character = unit.character, level = unit.level}
    else
      self.player:add_follower(Player{group = self.main, character = unit.character, level = unit.level})
    end
  end

  -- Set win condition and enemy spawns
  self.win_condition = random:table{'time', 'enemy_kill', 'wave'}
  if self.win_condition == 'wave' then
    self.level_to_max_waves = {
      1, 2, random:int(2, 3),
      3, 3, 3, random:int(3, 4),
      4, 4, 4, 4, random:int(4, 5),
      5, 5, 5, 5, 5, random:int(5, 6),
      6, 7, 8, 9, 9, 10, 12
    }
    self.max_waves = self.level_to_max_waves[self.level]
    self.wave = 0
    self.start_time = 3
    self.t:after(1, function()
      self.t:every(1, function()
        if self.start_time > 1 then alert1:play{volume = 0.5} end
        self.start_time = self.start_time - 1
        self.hfx:use('condition1', 0.25, 200, 10)
      end, 3, function()
        alert1:play{pitch = 1.2, volume = 0.5}
        camera:shake(4, 0.25)
        SpawnEffect{group = self.effects, x = gw/2, y = gh/2 - 48}
        self.t:every(function() return #self.main:get_objects_by_classes(self.enemies) <= 0 end, function()
          self.wave = self.wave + 1
          if self.wave > self.max_waves then return end
          self.hfx:use('condition1', 0.25, 200, 10)
          self.hfx:pull('condition2', 0.0625)
          self.t:after(0.5, function()
            local spawn_type = random:table{'left', 'middle', 'right'}
            local spawn_points = {left = {x = self.x1 + 32, y = gh/2}, middle = {x = gw/2, y = gh/2}, right = {x = self.x2 - 32, y = gh/2}}
            self:spawn_n_enemies(spawn_points[spawn_type], nil, 8 + (self.wave-1)*2)
          end)
        end, self.max_waves+1)
      end)
      self.t:every(function() return #self.main:get_objects_by_classes(self.enemies) <= 0 and self.wave > self.max_waves end, function() self.can_quit = true end)
    end)

  elseif self.win_condition == 'enemy_kill' then
    self.level_to_enemies_to_kill = {
      8, 12, random:int(14, 16),
      16, 16, 18, random:int(18, 20),
      20, 20, 20, 20, random:int(20, 22),
      22, 22, 22, 22, 22, random:int(22, 24),
      24, 26, 28, 30, 30, 32, 40
    }
    self.enemies_killed = 0
    self.enemies_to_kill = self.level_to_enemies_to_kill[self.level]
    self.enemy_spawn_delay = 8
    self.enemies_spawned = 0
    self.start_time = 3
    self.t:after(1, function()
      self.t:every(1, function()
        if self.start_time > 1 then alert1:play{volume = 0.5} end
        self.start_time = self.start_time - 1
        self.hfx:use('condition1', 0.25, 200, 10)
      end, 3, function()
        alert1:play{pitch = 1.2, volume = 0.5}
        camera:shake(4, 0.25)
        SpawnEffect{group = self.effects, x = gw/2, y = gh/2 - 48}
        self:spawn_distributed_enemies()
        self.t:every(2, function()
          if love.timer.getTime() - self.last_spawn_enemy_time >= self.enemy_spawn_delay and #self.main:get_objects_by_class(self.enemies) < self.enemies_to_kill and not self.transitioning then
            self:spawn_distributed_enemies()
          end
        end, nil, nil, 'spawn_enemies')
      end)
    end)
    self.t:every(function() return #self.main:get_objects_by_classes(self.enemies) <= 0 and self.enemies_killed >= self.enemies_to_kill end, function() self.can_quit = true end)

  elseif self.win_condition == 'time' then
    self.level_to_time_left = {
      20, 20, random:int(20, 25),
      25, 25, 25, random:int(25, 30),
      30, 30, 30, 30, random:int(30, 35),
      35, 35, 35, 35, 35, random:int(35, 40),
      40, 45, 50, 55, 55, 60, 80
    }
    self.time_left = self.level_to_time_left[self.level]
    self.start_time = 3
    self.t:after(1, function()
      self.t:every(1, function()
        if self.start_time > 1 then alert1:play{volume = 0.5} end
        self.start_time = self.start_time - 1
        self.hfx:use('condition1', 0.25, 200, 10)
      end, 3, function()
        alert1:play{pitch = 1.2, volume = 0.5}
        camera:shake(4, 0.25)
        SpawnEffect{group = self.effects, x = gw/2, y = gh/2 - 48}
        self.t:every(1, function()
          self.time_left = self.time_left - 1
          self.hfx:use('condition1', 0.25, 200, 10)
          self.hfx:pull('condition2', 0.0625)
        end, self.time_left)

        self.t:every_immediate(2, function()
          if #self.main:get_objects_by_classes(self.enemies) <= 0 or love.timer.getTime() - self.last_spawn_enemy_time >= 8 and not self.transitioning then
            self:spawn_distributed_enemies()
          end
        end, self.time_left/2)
      end)
    end)
    self.t:every(function() return #self.main:get_objects_by_classes(self.enemies) <= 0 and self.time_left <= 0 end, function() self.can_quit = true end)
  end

  if self.level == 1 then
    local t1 = Text2{group = self.floor, x = gw/2, y = gh/2 + 2, sx = 0.6, sy = 0.6, lines = {{text = '[light_bg]<- or a         -> or d', font = fat_font, alignment = 'center'}}}
    local t2 = Text2{group = self.floor, x = gw/2, y = gh/2 + 18, lines = {{text = '[light_bg]turn left                                      turn right', font = pixul_font, alignment = 'center'}}}
    local t3 = Text2{group = self.floor, x = gw/2, y = gh/2 + 46, sx = 0.6, sy = 0.6, lines = {{text = '[light_bg]s - mute sfx', font = fat_font, alignment = 'center'}}}
    local t4 = Text2{group = self.floor, x = gw/2, y = gh/2 + 68, sx = 0.6, sy = 0.6, lines = {{text = '[light_bg]m - mute music', font = fat_font, alignment = 'center'}}}
    t1.t:after(8, function() t1.t:tween(0.2, t1, {sy = 0}, math.linear, function() t1.sy = 0 end) end)
    t2.t:after(8, function() t2.t:tween(0.2, t2, {sy = 0}, math.linear, function() t2.sy = 0 end) end)
    t3.t:after(8, function() t3.t:tween(0.2, t3, {sy = 0}, math.linear, function() t3.sy = 0 end) end)
    t4.t:after(8, function() t4.t:tween(0.2, t4, {sy = 0}, math.linear, function() t4.sy = 0 end) end)
  end

  -- Calculate class levels
  local units = {}
  table.insert(units, self.player)
  for _, f in ipairs(self.player.followers) do table.insert(units, f) end

  local rangers = 0
  local warriors = 0
  local healers = 0
  local mages = 0
  local nukers = 0
  local conjurers = 0
  local rogues = 0
  local enchanters = 0
  local psys = 0
  for _, unit in ipairs(units) do
    for _, unit_class in ipairs(unit.classes) do
      if unit_class == 'ranger' then rangers = rangers + 1 end
      if unit_class == 'warrior' then warriors = warriors + 1 end
      if unit_class == 'healer' then healers = healers + 1 end
      if unit_class == 'mage' then mages = mages + 1 end
      if unit_class == 'nuker' then nukers = nukers + 1 end
      if unit_class == 'conjurer' then conjurers = conjurers + 1 end
      if unit_class == 'rogue' then rogues = rogues + 1 end
      if unit_class == 'enchanter' then enchanters = enchanters + 1 end
      if unit_class == 'psy' then psys = psys + 1 end
    end
  end

  self.ranger_level = 0
  if rangers >= 2 then self.ranger_level = 1 end
  if rangers >= 4 then self.ranger_level = 2 end
  self.warrior_level = 0
  if warriors >= 2 then self.warrior_level = 1 end
  if warriors >= 4 then self.warrior_level = 2 end
  self.healer_level = 0
  if healers >= 3 then self.healer_level = 1 end
  self.mage_level = 0
  if mages >= 2 then self.mage_level = 1 end
  if mages >= 4 then self.mage_level = 2 end
  self.nuke_level = 0
  if nukers >= 2 then self.nuke_level = 1 end
  if nukers >= 4 then self.nuke_level = 2 end
  self.conjurer_level = 0
  if conjurers >= 2 then self.conjurer_level = 1 end
  self.rogue_level = 0
  if rogues >= 2 then self.rogue_level = 1 end
  if rogues >= 4 then self.rogue_level = 2 end
  self.enchanter_level = 0
  if enchanters >= 3 then self.enchanter_level = 1 end
  self.psy_level = psys
end


function Arena:update(dt)
  if input.escape.pressed and not self.transitioning then
    if not self.paused then
      trigger:tween(0.25, _G, {slow_amount = 0}, math.linear, function()
        slow_amount = 0
        self.paused = true
        self.paused_t1 = Text2{group = self.ui, x = gw/2, y = gh/2 - 68, sx = 0.6, sy = 0.6, lines = {{text = '[bg10]<- or a         -> or d', font = fat_font, alignment = 'center'}}}
        self.paused_t2 = Text2{group = self.ui, x = gw/2, y = gh/2 - 52, lines = {{text = '[bg10]turn left                                      turn right', font = pixul_font, alignment = 'center'}}}
        self.paused_t3 = Text2{group = self.ui, x = gw/2, y = gh/2 - 22, sx = 0.6, sy = 0.6, lines = {{text = '[bg10]s - mute sfx', font = fat_font, alignment = 'center'}}}
        self.paused_t4 = Text2{group = self.ui, x = gw/2, y = gh/2 + 0, sx = 0.6, sy = 0.6, lines = {{text = '[bg10]m - mute music', font = fat_font, alignment = 'center'}}}
        self.paused_t5 = Text2{group = self.ui, x = gw/2, y = gh/2 + 22, sx = 0.6, sy = 0.6, lines = {{text = '[bg10]esc - resume game', font = fat_font, alignment = 'center'}}}
        self.paused_t6 = Text2{group = self.ui, x = gw/2, y = gh/2 + 44, sx = 0.6, sy = 0.6, lines = {{text = '[bg10]r - restart run', font = fat_font, alignment = 'center'}}}
        self.paused_t7 = Text2{group = self.ui, x = gw/2, y = gh/2 + 68, sx = 0.6, sy = 0.6, lines = {{text = '[bg10]w - wishlist on steam', font = fat_font, alignment = 'center'}}}
      end, 'pause')
    else
      trigger:tween(0.25, _G, {slow_amount = 1}, math.linear, function()
        slow_amount = 1
        self.paused = false
        self.paused_t1.dead = true
        self.paused_t2.dead = true
        self.paused_t3.dead = true
        self.paused_t4.dead = true
        self.paused_t5.dead = true
        self.paused_t6.dead = true
        self.paused_t7.dead = true
        self.paused_t1 = nil
        self.paused_t2 = nil
        self.paused_t3 = nil
        self.paused_t4 = nil
        self.paused_t5 = nil
        self.paused_t6 = nil
        self.paused_t7 = nil
      end, 'pause')
    end
  end

  if self.paused or self.died and not self.transitioning then
    if input.r.pressed then
      self.transitioning = true
      ui_transition2:play{pitch = random:float(0.95, 1.05), volume = 0.5}
      ui_switch2:play{pitch = random:float(0.95, 1.05), volume = 0.5}
      ui_switch1:play{pitch = random:float(0.95, 1.05), volume = 0.5}
      TransitionEffect{group = main.transitions, x = gw/2, y = gh/2, color = fg[0], transition_action = function()
        slow_amount = 1
        gold = 2
        cascade_instance:stop()
        main:add(BuyScreen'buy_screen')
        main:go_to('buy_screen', 0, {})
      end, text = Text({{text = '[wavy, bg]restarting...', font = pixul_font, alignment = 'center'}}, global_text_tags)}
    end

    if input.w.pressed then
      ui_switch2:play{pitch = random:float(0.95, 1.05), volume = 0.5}
      ui_switch1:play{pitch = random:float(0.95, 1.05), volume = 0.5}
      system.open_url'https://store.steampowered.com/app/915310/SNKRX/'
    end
  end

  if input.w.pressed and self.won then
    ui_switch2:play{pitch = random:float(0.95, 1.05), volume = 0.5}
    ui_switch1:play{pitch = random:float(0.95, 1.05), volume = 0.5}
    system.open_url'https://store.steampowered.com/app/915310/SNKRX/'
  end

  self:update_game_object(dt*slow_amount)
  cascade_instance.pitch = math.clamp(slow_amount*self.main_slow_amount, 0.05, 1)

  if input.k.pressed then
    local enemies = self.main:get_objects_by_classes(self.enemies)
    for _, enemy in ipairs(enemies) do enemy:hit(1000000000000) end
  end

  if self.enchanter_level == 1 then self.enchanter_dmg_m = 1.25
  else self.enchanter_dmg_m = 1 end

  self.floor:update(dt*slow_amount)
  self.main:update(dt*slow_amount*self.main_slow_amount)
  self.post_main:update(dt*slow_amount)
  self.effects:update(dt*slow_amount)
  self.ui:update(dt*slow_amount)

  if self.can_quit and #self.main:get_objects_by_classes(self.enemies) <= 0 and not self.transitioning then
    self.can_quit = false
    self.transitioning = true
    local gold_gained = random:int(level_to_gold_gained[self.level][1], level_to_gold_gained[self.level][2])
    gold = gold + gold_gained

    if self.level == 25 then
      if not self.win_text and not self.win_text2 then
        self.won = true
        camera.x, camera.y = gw/2, gh/2
        self.win_text = Text2{group = self.ui, x = gw/2, y = gh/2 - 64, lines = {{text = '[wavy_mid, cbyc2]congratulations!', font = fat_font, alignment = 'center'}}}
        self.t:after(2.5, function()
          self.win_text2 = Text2{group = self.ui, x = gw/2, y = gh/2 + 16, lines = {
            {text = "[fg]you've beaten the demo!", font = pixul_font, alignment = 'center', height_multiplier = 1.2},
            {text = "[fg]the game's full version is coming in a few weeks,", font = pixul_font, alignment = 'center', height_multiplier = 1.2},
            {text = "[fg]so if you liked the game, make sure to wishlist it!", font = pixul_font, alignment = 'center', height_multiplier = 5},
            {text = "[wavy_mid, fg]thanks for playing!", font = pixul_font, alignment = 'center'},
          }}
          WishlistButton{group = self.ui, x = gw/2, y = gh/2 + 30, w_to_wishlist = true}
        end)
      end

    else
      if not self.arena_clear_text then self.arena_clear_text = Text2{group = self.ui, x = gw/2, y = gh/2 - 48, lines = {{text = '[wavy_mid, cbyc]arena clear!', font = fat_font, alignment = 'center'}}} end
      self.t:after(3, function()
        ui_transition2:play{pitch = random:float(0.95, 1.05), volume = 0.5}
        TransitionEffect{group = main.transitions, x = self.player.x, y = self.player.y, color = self.color, transition_action = function(t)
          main:add(BuyScreen'buy_screen')
          main:go_to('buy_screen', self.level, self.units)
          t.t:after(0.1, function()
            t.text:set_text({
              {text = '[nudge_down, bg]gold gained: ' .. tostring(gold_gained), font = pixul_font, alignment = 'center', height_multiplier = 1.5},
              {text = '[wavy_lower, bg]damage taken: 0', font = pixul_font, alignment = 'center', height_multiplier = 1.5},
              {text = '[wavy_lower, bg]damage dealt: 0', font = pixul_font, alignment = 'center'}
            })
            _G[random:table{'coins1', 'coins2', 'coins3'}]:play{pitch = random:float(0.95, 1.05), volume = 0.5}
            t.t:after(0.2, function()
              t.text:set_text({
                {text = '[wavy_lower, bg]gold gained: ' .. tostring(gold_gained), font = pixul_font, alignment = 'center', height_multiplier = 1.5},
                {text = '[nudge_down, bg]damage taken: ' .. tostring(math.round(self.damage_taken, 0)), font = pixul_font, alignment = 'center', height_multiplier = 1.5},
                {text = '[wavy_lower, bg]damage dealt: 0', font = pixul_font, alignment = 'center'}
              })
              _G[random:table{'coins1', 'coins2', 'coins3'}]:play{pitch = random:float(0.95, 1.05), volume = 0.5}
              t.t:after(0.2, function()
                t.text:set_text({
                  {text = '[wavy_lower, bg]gold gained: ' .. tostring(gold_gained), font = pixul_font, alignment = 'center', height_multiplier = 1.5},
                  {text = '[wavy_lower, bg]damage taken: ' .. tostring(math.round(self.damage_taken, 0)), font = pixul_font, alignment = 'center', height_multiplier = 1.5},
                  {text = '[nudge_down, bg]damage dealt: ' .. tostring(math.round(self.damage_dealt, 0)), font = pixul_font, alignment = 'center'}
                })
                _G[random:table{'coins1', 'coins2', 'coins3'}]:play{pitch = random:float(0.95, 1.05), volume = 0.5}
              end)
            end)
          end)
        end, text = Text({
          {text = '[wavy_lower, bg]gold gained: 0', font = pixul_font, alignment = 'center', height_multiplier = 1.5},
          {text = '[wavy_lower, bg]damage taken: 0', font = pixul_font, alignment = 'center', height_multiplier = 1.5},
          {text = '[wavy_lower, bg]damage dealt: 0', font = pixul_font, alignment = 'center'}
        }, global_text_tags)}
      end, 'transition')
    end
  end
end


function Arena:draw()
  self.floor:draw()
  self.main:draw()
  self.post_main:draw()
  self.effects:draw()
  self.ui:draw()

  camera:attach()
  if self.start_time and self.start_time > 0 then
    graphics.push(gw/2, gh/2 - 48, 0, self.hfx.condition1.x, self.hfx.condition1.x)
      graphics.print_centered(tostring(self.start_time), fat_font, gw/2, gh/2 - 48, 0, 1, 1, nil, nil, self.hfx.condition1.f and fg[0] or red[0])
    graphics.pop()
  end

  if self.win_condition then
    if self.win_condition == 'time' then
      if self.start_time <= 0 then
        graphics.push(self.x2 - 66, self.y1 - 9, 0, self.hfx.condition2.x, self.hfx.condition2.x)
          graphics.print_centered('time left:', fat_font, self.x2 - 66, self.y1 - 9, 0, 0.6, 0.6, nil, nil, fg[0])
        graphics.pop()
        graphics.push(self.x2 - 18 + fat_font:get_text_width(tostring(self.time_left))/2, self.y1 - 8, 0, self.hfx.condition1.x, self.hfx.condition1.x)
          graphics.print(tostring(self.time_left), fat_font, self.x2 - 18, self.y1 - 8, 0, 0.75, 0.75, nil, fat_font.h/2, self.hfx.condition1.f and fg[0] or yellow[0])
        graphics.pop()
      end
    elseif self.win_condition == 'wave' then
      if self.start_time <= 0 then
        graphics.push(self.x2 - 50, self.y1 - 10, 0, self.hfx.condition2.x, self.hfx.condition2.x)
          graphics.print_centered('wave:', fat_font, self.x2 - 50, self.y1 - 10, 0, 0.6, 0.6, nil, nil, fg[0])
        graphics.pop()
        graphics.push(self.x2 - 25 + fat_font:get_text_width(self.wave .. '/' .. self.max_waves)/2, self.y1 - 8, 0, self.hfx.condition1.x, self.hfx.condition1.x)
          graphics.print(self.wave .. '/' .. self.max_waves, fat_font, self.x2 - 25, self.y1 - 8, 0, 0.75, 0.75, nil, fat_font.h/2, self.hfx.condition1.f and fg[0] or yellow[0])
        graphics.pop()
      end
    elseif self.win_condition == 'enemy_kill' then
      if self.start_time <= 0 then
        graphics.push(self.x2 - 106, self.y1 - 10, 0, self.hfx.condition2.x, self.hfx.condition2.x)
          graphics.print_centered('enemies killed:', fat_font, self.x2 - 106, self.y1 - 10, 0, 0.6, 0.6, nil, nil, fg[0])
        graphics.pop()
        graphics.push(self.x2 - 41 + fat_font:get_text_width(self.enemies_killed .. '/' .. self.enemies_to_kill)/2, self.y1 - 8, 0, self.hfx.condition1.x, self.hfx.condition1.x)
          graphics.print(self.enemies_killed .. '/' .. self.enemies_to_kill, fat_font, self.x2 - 41, self.y1 - 8, 0, 0.75, 0.75, nil, fat_font.h/2, self.hfx.condition1.f and fg[0] or yellow[0])
        graphics.pop()
      end
    end
  end
  camera:detach()
end


function Arena:die()
  if not self.died_text and not self.won then
    self.died = true
    self.t:tween(2, self, {main_slow_amount = 0}, math.linear, function() self.main_slow_amount = 0 end)
    self.died_text = Text2{group = self.ui, x = gw/2, y = gh/2 - 32, lines = {
      {text = '[wavy_mid, cbyc]you died...', font = fat_font, alignment = 'center', height_multiplier = 1.25},
    }}
    self.t:after(2, function()
      self.death_info_text = Text2{group = self.ui, x = gw/2, y = gh/2 + 24, sx = 0.7, sy = 0.7, lines = {
        {text = '[wavy_mid, light_bg]level reached: [wavy_mid, yellow]' .. self.level, font = fat_font, alignment = 'center'},
        {text = '[wavy_mid, light_bg]r - start new run', font = fat_font, alignment = 'center'},
        {text = '[wavy_mid, light_bg]w - wishlist on steam', font = fat_font, alignment = 'center'},
      }}
    end)
  end
end


function Arena:enemy_killed()
  if self.win_condition == 'enemy_kill' then
    self.enemies_killed = self.enemies_killed + 1
    self.hfx:use('condition1', 0.25, 200, 10)
    self.hfx:pull('condition2', 0.0625)
    self.enemy_spawn_delay = self.enemy_spawn_delay*0.95
    if self.enemies_killed >= self.enemies_to_kill then
      self.can_quit = true
      self.t:cancel'spawn_enemies'
    end
  end
end


function Arena:spawn_distributed_enemies()
  local t = {'4', '4+4', '4+4+4', '2x4', '3x4', '4x2'}
  local spawn_type = t[random:weighted_pick(40, 20, 5, 15, 5, 15)]
  local spawn_points = table.copy(self.spawn_points)
  if spawn_type == '4' then
    self:spawn_n_enemies(random:table_remove(spawn_points))
  elseif spawn_type == '4+4' then
    local p = random:table_remove(spawn_points)
    self:spawn_n_enemies(p)
    self.t:after(2, function() self:spawn_n_enemies(p) end)
  elseif spawn_type == '4+4+4' then
    local p = random:table_remove(spawn_points)
    self:spawn_n_enemies(p)
    self.t:after(1, function()
      self:spawn_n_enemies(p)
      self.t:after(1, function()
        self:spawn_n_enemies(p)
      end)
    end)
  elseif spawn_type == '2x4' then
    self:spawn_n_enemies(random:table_remove(spawn_points), 1)
    self:spawn_n_enemies(random:table_remove(spawn_points), 2)
  elseif spawn_type == '3x4' then
    self:spawn_n_enemies(random:table_remove(spawn_points), 1)
    self:spawn_n_enemies(random:table_remove(spawn_points), 2)
    self:spawn_n_enemies(random:table_remove(spawn_points), 3)
  elseif spawn_type == '4x2' then
    self:spawn_n_enemies(random:table_remove(spawn_points), 1, 2)
    self:spawn_n_enemies(random:table_remove(spawn_points), 2, 2)
    self:spawn_n_enemies(random:table_remove(spawn_points), 3, 2)
    self:spawn_n_enemies(random:table_remove(spawn_points), 4, 2)
  end
end


function Arena:spawn_n_enemies(p, j, n)
  if self.died then return end
  j = j or 1
  n = n or 4
  self.last_spawn_enemy_time = love.timer.getTime()
  self.t:every(0.1, function()
    if self.win_condition == 'enemy_kill' then
      if self.enemies_spawned >= math.floor(1.4*self.enemies_to_kill) then return end
      self.enemies_spawned = self.enemies_spawned + 1
    end
    local o = self.spawn_offsets[(self.t:get_every_iteration('spawn_enemies_' .. j) % 5) + 1]
    SpawnEffect{group = self.effects, x = p.x + o.x, y = p.y + o.y, action = function(x, y)
      spawn1:play{pitch = random:float(0.8, 1.2), volume = 0.15}
      Seeker{group = self.main, x = x, y = y, character = 'seeker', level = self.level}
    end}
  end, n, nil, 'spawn_enemies_' .. j)
end