local window = require('window')

-- base prototype of all drawn things
local m = {
    _t = 'entity',
    x = 0,
    y = 0,
    width = 0,
    height = 0,
}

m.__index = m

function m:from(t)
    t.__index = t
    return setmetatable(t, self)
end

function m:new()
    return self:from({})
end

function m:setpos(x, y)
    self.x = x
    self.y = y
end

local function draw_line(l)
    local mode = l[1]
    local segs = l[2]

    if mode == 'line' then
        love.graphics.line(segs)
    elseif mode == 'fill' then
        local ts = love.math.triangulate(segs)
        love.graphics.setColor(0, 0, 0)
        for i, t in ipairs(ts) do
            love.graphics.polygon('fill', t)
        end

        love.graphics.setColor(1, 1, 1)
        love.graphics.polygon('line', segs)
    else
        error(string.format("mode must be one of line or fill, not %s", mode))
    end
end

function m:draw_lines(lines)
    love.graphics.push('all')
    love.graphics.translate(self.x, self.y)
    love.graphics.setLineWidth(2)

    if type(lines[1]) == 'string' then
        draw_line(lines)
    else
        for _, l in ipairs(lines) do
            draw_line(l)
        end
    end

    love.graphics.pop()
end

function m:draw()
    self:draw_lines(self.lines)
end

function m:install(room, x, y)
    self:setpos(x, y)
    room:insert(self)
end

return m