local util = require('util')
local window = require('window')
local entity = require('entity')

-- prototype of room
-- - background
-- - objects
-- - edges
local room = entity:from{
    lines = {
        {'fill', {80, 60, 240, 60, 240, 180, 80, 180}},
        {'line', {0, 0, 80, 60}},
        {'line', {320, 0, 240, 60}},
        {'line', {0, 240, 80, 180}},
        {'line', {320, 240, 240, 180}},
    },
}

local from = room.from
function room:from(t)
    local r = from(self, t)
    
    r.edges = {}
    r.objects = {}

    return r
end

room.mousepressed = window.propagate{'edges', 'objects'}

room.draw = window.draw(function (self)
    self:draw_lines(self.lines)

    for i, v in ipairs(self.objects) do
        v:draw()
    end

    for i, v in ipairs(self.edges) do
        v:draw()
    end
end)

function room:insert(obj)
    util.add_entity(self.objects, obj)
end

function room:remove(obj)
    util.del_entity(self.objects, obj)
end

function room:onenter()
    if self.update then
        register(self)
    end
end

function room:onexit()
    if self.update then
        unregister(self)
    end
end

function room.calc_align(width, height)
    local sx = (320 - width)/2
    local sy = (240 - height)/2

    return sx, sy
end

return room