-- called every frame, with constant delta time
local capture = false
local trig = require "trig"
local Vector3l = require "vector3"


local function Vector3(x, y, z)
    if y == nil then
        return {x = x, y = x, z = x}
    end
    return {x = x, y = y, z = z}
end

local rot = 0
local rot_spd = 0.05

local spd = 0.07

local pos = Vector3(0)

local function Vector2(x, y)
    if y == nil then
        return {x = x, y = x}
    end
    return {x = x, y = y}
end

local function wrap(value, min, max)
    local range = max - min
    if value == 0 then
        return min
    end
    
    local result = value - (range * math.floor((value - min) / range))
    if result == max then
        return min
    end
    
    return result
end

local function b2n(value)
    return value and 1 or 0
end

function game_tick()
    -- ctx.initialization_needed is true first frame and every time dynamic reload is performed
    if ctx.initialization_needed then
        -- ctx.udata persists on reload
        ctx.udata = {}
    end
    ctx.mouse_capture = capture
    input_action{name="quit", control="SPACE"}

    input_action{name = "left", control = "A"}
    input_action{name = "right", control = "D"}
    input_action{name = "forward", control = "W"}
    input_action{name = "back", control = "S"}

    if input_action_just_pressed{name = "quit"} then
        if not capture then
            capture = true
        else
            capture = false
        end
    end
    local dir = draw_camera_from_principal_axes{position = pos, yaw = rot}.direction
    dir.y = 0
    dir = trig.v3_normalized(dir)

    local rot_d = b2n(input_action_pressed{name = "right"}) - b2n(input_action_pressed{name = "left"})
    rot = rot + rot_d * rot_spd

    local mov_d = b2n(input_action_pressed{name = "forward"}) - b2n(input_action_pressed{name = "back"})
    pos = trig.v3_add(pos, trig.v3_mult(dir, spd * mov_d))

    draw_billboard{position = Vector3(5, 0, 0), size = Vector2(1, 1), texture = "images/duck.png"}
end