util = require "util"
local player = require "classes.player"
local Vector3 = require "types.vector3"
local List = require "types.list"

local Feed = require "classes.feed"
---@type List
local feed = List()

local Duck = require "classes.duck"
---@type List
local ducks = List()

local function create_feed(position, direction)
  local f = Feed.new(position, direction)
  feed:push(f)
end

local function delete_feed(f)
  feed:remove_value(f)
end

local function duck_seek_feed(duck)
  local eligible_feeds = feed:filter(
    function (f)
      return f.occupied == false
    end
  )
  if eligible_feeds:is_empty() then return end
  duck:start_chase(
    eligible_feeds:sorted(
      function(a, b)
        return a.position:distance_squared_to(duck.position) < b.position:distance_squared_to(duck.position)
      end
    ):pop_front()
  )
end

-- called every frame, with constant delta time
function game_tick()
  -- ctx.initialization_needed is true first frame and every time dynamic reload is performed
  if ctx.initialization_needed then
    audio_play{audio = "music/bg1.xm", loops = true, channel = "music"}
    -- ctx.udata persists on reload
    ctx.udata = {
      capture = false,
    }
    player.ThrowPressed:connect(create_feed)

    -- spawn some ducks
    for i = 1, 5 do
      local duck = Duck.new(Vector3(0, 0, -math.random() * 10.0):rotated(Vector3.UP, util.random_float(-math.pi, math.pi)))
      ducks:push(duck)
      duck.AteFeed:connect(delete_feed)
      duck.SeekFeed:connect(duck_seek_feed)
      duck.index = i
    end

  end

  ctx.mouse_capture = ctx.udata.capture
  input_action{name = "toggle_mouse", control = "ESCAPE"}

  if input_action_just_pressed{name = "toggle_mouse"} then
    ctx.udata.capture = not ctx.udata.capture
  end

  for _, v in ipairs(feed) do
    v:tick(ctx)
  end

  for _, v in ipairs(ducks) do
    v:tick(ctx)
  end

  player:tick(ctx)
  local q = util.create_plane_quad(Vector3(0, 0, 0), Vector3.UP, 20)
  local params = {
    texture = "images/measure001a.png",
    texture_region = { x = 0, y = 0, w = 512, h = 512 },
  }
  draw_quad(util.merge(q, params))
end