local Event = require 'utils.event'
local radius = 16

local targets = {}
for x = radius * -1, radius, 1 do
    for y = radius * -1, radius, 1 do
        if math.sqrt(x ^ 2 + y ^ 2) <= radius then
            targets[#targets + 1] = {x = x, y = y}
        end
    end
end

local function on_entity_died(event)
    if not event.entity.valid then
        return
    end
    if event.entity.type ~= 'unit-spawner' then
        return
    end
    for _ = 1, math.random(64, 128) do
        local i = math.random(1, #targets)
        event.entity.surface.create_entity(
            {
                name = 'acid-stream-worm-medium',
                position = event.entity.position,
                force = event.entity.force.name,
                source = event.entity.position,
                target = {x = event.entity.position.x + targets[i].x, y = event.entity.position.y + targets[i].y},
                max_range = radius,
                speed = 0.001
            }
        )
    end
end

Event.add(defines.events.on_entity_died, on_entity_died)