-- nighttime is dangerous, stay near your lamps -- by mewmew

local Event = require 'utils.event'

local unearthing_worm = require 'functions.unearthing_worm'
local unearthing_biters = require 'functions.unearthing_biters'

local immune_tiles = {
    ['concrete'] = true,
    ['hazard-concrete-left'] = true,
    ['hazard-concrete-right'] = true,
    ['refined-concrete'] = true,
    ['refined-hazard-concrete-left'] = true,
    ['refined-hazard-concrete-right'] = true,
    ['stone-path'] = true
}

local function on_player_changed_position(event)
    local player = game.players[event.player_index]
    if not player.character then
        return
    end
    if player.character.driving == true then
        return
    end
    if player.surface.daytime < 0.33 then
        return
    end
    if player.surface.daytime > 0.66 then
        return
    end
    if math.random(1, 32) ~= 1 then
        return
    end

    for _, lamp in pairs(
        player.surface.find_entities_filtered({area = {{player.position.x - 18, player.position.y - 18}, {player.position.x + 18, player.position.y + 18}}, name = 'small-lamp'})
    ) do
        local circuit = lamp.get_or_create_control_behavior()
        if circuit then
            if lamp.energy > 25 and circuit.disabled == false then
                return
            end
        else
            if lamp.energy > 25 then
                return
            end
        end
    end

    local positions = {}
    local r = 8
    for x = r * -1, r, 1 do
        for y = r * -1, r, 1 do
            local distance = x ^ 2 + y ^ 2
            if distance > 4 and distance < 49 then
                if player.surface.can_place_entity({name = 'stone-furnace', position = {x = player.position.x + x, y = player.position.y + y}}) then
                    if not immune_tiles[player.surface.get_tile({x = player.position.x + x, y = player.position.y + y}).name] then
                        positions[#positions + 1] = {x = player.position.x + x, y = player.position.y + y}
                    end
                end
            end
        end
    end

    if #positions == 0 then
        return
    end

    if math.random(1, 3) == 1 then
        unearthing_biters(player.surface, positions[math.random(1, #positions)], math.random(3, 9))
    else
        unearthing_worm(player.surface, positions[math.random(1, #positions)])
    end
end

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