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

-- prototype of room
-- - background
-- - objects
-- - edges
local room = entity:from{
    lines = {
        {'line', 0, 0, 120, 80},
        {'line', 320, 0, 200, 80},
        {'line', 0, 240, 120, 160},
        {'line', 320, 240, 200, 160},
        {'fill', 120, 80, 200, 80, 200, 160, 200, 80},
    },
}

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

    return r
end

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

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

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

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

    return sx, sy
end

return room