local Circle = require("Circle")

local circles = {}
local spots = {}
function love.load()
	local stencil_data = love.image.newImageData("stencil.png")
	local w, h = stencil_data:getDimensions()

	for x=0, w-1 do
		for y=0, h-1 do
			local r, g, b = stencil_data:getPixel(x, y)
			local brigthness = (r + g + b)/3
			if brigthness > 0.9 then
				table.insert(spots, { x, y })
			end
		end
	end
end

local function dist(x1, y1, x2, y2)
	return ((x1-x2)^2 + (y1-y2)^2)^0.5
end

local function isInCircle(x, y)
	for _, circle in ipairs(circles) do
		local d = dist(circle.x, circle.y, x, y)
		if d < circle.r then
			return true
		end
	end
end

local function areCirclesOverlapping(circle1, circle2)
	local d = dist(circle1.x, circle1.y, circle2.x, circle2.y)
	if d - 2 < circle1.r + circle2.r then
		return true
	end
end

local function isCircleOverlapping(circle)
	for _, other_circle in ipairs(circles) do
		if other_circle ~= circle and areCirclesOverlapping(circle, other_circle) then
			return true
		end
	end
end

local function createCircle()
	local w, h = love.graphics.getDimensions()
	-- local x = love.math.random(0, w)
	-- local y = love.math.random(0, h)
	
	local index = love.math.random(1, #spots)
	local x = spots[index][1]
	local y = spots[index][2]

	if isInCircle(x, y) then return end

	return Circle:new(x, y)
end

function love.update(dt)
	local total = 3
	for _=1, total do
		local c = createCircle()

		if c then
			table.insert(circles, c)
		end
	end

	for _, circle in ipairs(circles) do
		if circle.growing then
			if isCircleOverlapping(circle) then
				circle.growing = false
			end
			if circle:edges() then
				circle.growing = false
			end
		end
		circle:grow(5*dt)
	end
end

function love.draw()
	for _, circle in ipairs(circles) do
		circle:draw()
	end
end