surface_effect/function.lua

local S = minetest.get_translator("surface_effect")

surface_effect.dump = function(o)
    if type(o) == 'table' then
        local s = '{ '
        for k,v in pairs(o) do
            if type(k) ~= 'number' then k = '"'..k..'"' end
            s = s .. '['..k..'] = ' .. surface_effect.dump(v) .. ','
        end
        return s .. '} '
    else
        return tostring(o)
    end
end

surface_effect.showLogo = function(player)
    local name = player:get_player_name()

    if surface_effect.nplayer[name]['logo'] == 'off' then
        local id = player:hud_add({
            name = "logo",
            hud_elem_type = "image",
            position = {x = 0.2, y = 0.9},
            scale = {
                x = -30,
                y = -10
            },
            text = "surfaces_effect_Mine_apocalypse.png"
        })

        surface_effect.nplayer[name]['logo'] = "on"

        minetest.log("action", name .. " status logo " .. surface_effect.nplayer[name]['logo'] .. " id " .. id)
    end
end

surface_effect.setHud = function(player)
    local name = player:get_player_name()

    if type(surface_effect.nplayer[name]) == 'nil' then
        surface_effect.nplayer[name] = {
            radiation_damage = "OFF",
            id_varning_text = false,
            logo = 'off',
            id_mask = false,
        }

        minetest.log("action", "Load nplayer: " .. surface_effect.dump(surface_effect.nplayer))
    end
end

surface_effect.checkHazmat = function(player)
    local armor = armor:get_weared_armor_elements (player)

    if armor ~= 'nil' then
        if type(armor) == 'nil' then return false end

        if armor.head == "hazmat_suit:suit_hazmat" then
            return true
        else
            return false
        end
    end

    return false
end

surface_effect.radiaton_off = function(player)
    local name = player:get_player_name()

    if surface_effect.nplayer[name]["radiation_damage"] == "ON" then
        player:hud_remove(surface_effect.nplayer[name]['id_varning_text'])
        surface_effect.nplayer[name]["radiation_damage"] = "OFF"
        surface_effect.nplayer[name]["id_varning_text"] = nil
    end
end

--Защита от радиацйии
surface_effect.technic_forcefield_radiation_protection = function(pos, player)
    if not minetest.get_modpath("technic") then return false end

    local radius = 20
    local protectors = minetest.find_nodes_in_area(
            {x = pos.x - radius , y = pos.y - radius , z = pos.z - radius},
            {x = pos.x + radius , y = pos.y + radius , z = pos.z + radius},
            {"technic:forcefield_emitter_on"})

    if #protectors > 0 then
        local npos = protectors[1]
        local meta = minetest.get_meta(npos)
        local pos1 = vector.subtract(pos, npos)
        local range = meta:get_int("range")

        if math.round(pos1.x) < range and math.round(pos1.x) > 0 - range and
                math.round(pos1.y) < range and math.round(pos1.y) > 0 - range and
                math.round(pos1.z) < range and math.round(pos1.z) > 0 - range
        then
            --minetest.chat_send_all(dump((0 - range)))
            surface_effect.radiaton_off(player)
            return true
        end

        return false
    else
        return false
    end
end

surface_effect.mask = function(player)
    local name = player:get_player_name()

    if surface_effect.checkHazmat(player) == true and surface_effect.nplayer[name]["id_mask"] == false then
        local id = player:hud_add({
            name = "Radiation effect",
            hud_elem_type = "image",
            position = {x = 0.5, y = 0.5},
            scale = {
                x = -100,
                y = -110
            },
            z_index = -100,
            text = "surface_effect_mask.png"
        })

        surface_effect.nplayer[name]["id_mask"] = id

    elseif surface_effect.nplayer[name]["id_mask"] ~= false and surface_effect.checkHazmat(player) == false then
        player:hud_remove(surface_effect.nplayer[name]['id_mask'])
        surface_effect.nplayer[name]["id_mask"] = false
    end

    return
end

su.rediationDomage = function (player, pos)
    local name = player:get_player_name()

    if pos.y > -40 and pos.y < 1500 then
        if surface_effect.technic_forcefield_radiation_protection(pos,player) == true then
            return
        end

        minetest.sound_play("surface_effect_radiaciya",{
            gain = 1.0,
            to_player = name,
        })

        persistent_api.add_persistent_effect({
            name = "damage_player", -- identifier
            object = player, -- affected object
            duration = 10, -- this effect will last 10 seconds
            effect = function(player)

                if surface_effect.nplayer[name]['radiation_damage'] == "OFF" then
                    local idtext = player:hud_add({
                        name = "Attention! Radiation ",
                        hud_elem_type = "text",
                        position  = {x = 1, y = 0.5},
                        offset    = {x = -180, y = 0},
                        text      = S("Attention! High levels of radiation."),
                        alignment = -1,
                        scale     = { x = 50, y = 10},
                        number    = 0xFF0000,
                    })

                    minetest.after(1.52, function(name, id)
                        local player = minetest.get_player_by_name(name)
                        if player then
                            --player:hud_remove(id)
                        else
                            -- player has left the game
                        end
                    end, player:get_player_name(), id)
                    surface_effect.nplayer[name]["radiation_damage"] = "ON"
                    surface_effect.nplayer[name]["id_varning_text"] = idtext
                end

                if surface_effect.checkHazmat(player) == false then
                    player:set_hp(player:get_hp()-0.1) -- damage the player one half heart
                end

            end,
            persistence = 2, -- every 0.1 seconds for 10 seconds the previous function will be run.
        })
    else
        surface_effect.radiaton_off(player)
    end
end