RedMew/map_gen/Diggy/Feature/DiggyHole.lua

--[[-- info
    Provides the ability to "mine" through out-of-map tiles by destroying or
    mining rocks next to it.
]]

-- dependencies
local Event = require 'utils.event'
local Scanner = require 'map_gen.Diggy.Scanner'
local Template = require 'map_gen.Diggy.Template'
local Debug = require 'map_gen.Diggy.Debug'
local insert = table.insert
local random = math.random

-- this
local DiggyHole = {}

--[[--
    Triggers a diggy diggy hole for a given sand-rock-big.

    Will return true even if the tile behind it is immune.

    @param entity LuaEntity
]]
local function diggy_hole(entity)
    if (entity.name ~= 'sand-rock-big') then
        return
    end

    local tiles = {}
    local rocks = {}
    local surface = entity.surface

    local out_of_map_found = Scanner.scan_around_position(surface, entity.position, 'out-of-map');

    for _, position in pairs(out_of_map_found) do
        insert(tiles, {name = 'dirt-' .. random(1, 7), position = position})
        insert(rocks, {name = 'sand-rock-big', position = position})
    end

    Template.insert(surface, tiles, rocks)
end

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

local function on_mined_tile(surface, tiles)
    local new_tiles = {}

    for _, tile in pairs(tiles) do
        if (artificial_tiles[tile.old_tile.name]) then
            insert(new_tiles, { name = 'dirt-' .. random(1, 7), position = tile.position})
        end
    end

    Template.insert(surface, new_tiles, {})
end

--[[--
    Registers all event handlers.
]]
function DiggyHole.register(config)
    Event.add(defines.events.on_entity_died, function (event)
        local entity = event.entity
        diggy_hole(entity)

        local position = entity.position
        local surface = entity.surface

        -- fixes massive frame drops when too much stone is spilled
        local stones = surface.find_entities_filtered({
            area = {{position.x - 2, position.y - 2}, {position.x + 2, position.y + 2}},
            limit = 60,
            type = 'item-entity',
            name = 'item-on-ground',
        })
        for _, stone in ipairs(stones) do
            if (stone.stack.name == 'stone') then
                stone.destroy()
            end
        end
    end)

    Event.add(defines.events.on_player_mined_entity, function (event)
        diggy_hole(event.entity)
    end)

    Event.add(defines.events.on_robot_mined_tile, function(event)
        on_mined_tile(event.robot.surface, event.tiles)
    end)

    Event.add(defines.events.on_player_mined_tile, function(event)
        on_mined_tile(game.surfaces[event.surface_index], event.tiles)
    end)

    if config.enable_debug_commands then
        commands.add_command('clear-void', '<left top x> <left top y> <width> <height> <surface index> triggers Template.insert for the given area.', function(cmd)
            local params = {}
            local args = cmd.parameter or ''
            for param in string.gmatch(args, '%S+') do
                table.insert(params, param)
            end

            if (#params ~= 5) then
                game.player.print('/clear-void requires exactly 5 arguments: <left top x> <left top y> <width> <height> <surface index>')
                return
            end

            local left_top_x = tonumber(params[1])
            local left_top_y = tonumber(params[2])
            local width = tonumber(params[3])
            local height = tonumber(params[4])
            local surface_index = params[5]
            local tiles = {}
            local entities = {}

            for x = 0, width do
                for y = 0, height do
                    insert(tiles, {name = 'dirt-' .. random(1, 7), position = {x = x + left_top_x, y = y + left_top_y}})
                end
            end

            Template.insert(game.surfaces[surface_index], tiles, entities)
        end
        )
    end
end

function DiggyHole.on_init()
    game.forces.player.technologies['landfill'].enabled = false
end

return DiggyHole