minetest.git - modified minetest for gpcfs purposes

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local SPEED = 10
local ACCEL = 0.1
local VERSION = 8
local PTIMEOUT = 120

local technic_path = minetest.get_modpath("technic")
local chains_path = minetest.get_modpath("chains")

-- Central "network" table.
local elevator = {
    motors = {},
}

local elevator_file = minetest.get_worldpath() .. "/elevator"

local function load_elevator()
    local file = io.open(elevator_file)
    if file then
        elevator = minetest.deserialize(file:read("*all")) or {}
        file:close()
    end
end

local function save_elevator()
    local f = io.open(elevator_file .. ".tmp", "w")
    f:write(minetest.serialize(elevator))
    f:close()
    os.rename(elevator_file .. ".tmp", elevator_file)
end

load_elevator()

-- Elevator boxes in action.
local boxes = {}
-- Player formspecs.
local formspecs = {}
-- Player near box timeout.
local lastboxes = {}
-- Players riding boxes.
local riding = {}
-- Globalstep timer.
local time = 0

-- Helper function to read unloaded nodes.
local function get_node(pos)
    local node = minetest.get_node_or_nil(pos)
    if node then return node end
    local _,_ = VoxelManip():read_from_map(pos, pos)
    return minetest.get_node_or_nil(pos)
end

-- Placeholder node, in the style of homedecor.
local placeholder = "elevator:placeholder"
minetest.register_node(placeholder, {
    description = "Expansion placeholder (you hacker you!)",
    selection_box = { type = "fixed", fixed = { 0, 0, 0, 0, 0, 0 } },
    groups = {
        not_in_creative_inventory=1
    },
    drawtype = "airlike",
    paramtype = "light",
    sunlight_propagates = true,

    walkable = false,
    buildable_to = false,
    is_ground_content = false,

    on_dig = function(pos, node, player)
        minetest.remove_node(pos)
        minetest.set_node(pos, {name=placeholder})
    end
})

-- Cause <sender> to ride <motorhash> beginning at <pos> and targetting <target>.
local function create_box(motorhash, pos, target, sender)
    -- First create the box.
    local obj = minetest.add_entity(pos, "elevator:box")
    obj:set_pos(pos)
    -- Attach the player.
    sender:set_pos(pos)
    sender:set_attach(obj, "", {x=0, y=0, z=0}, {x=0, y=0, z=0})
    sender:set_eye_offset({x=0, y=-9, z=0},{x=0, y=-9, z=0})
    -- Set the box properties.
    obj:get_luaentity().motor = motorhash
    obj:get_luaentity().uid = math.floor(math.random() * 1000000)
    obj:get_luaentity().attached = sender:get_player_name()
    obj:get_luaentity().start = pos
    obj:get_luaentity().target = target
    obj:get_luaentity().halfway = {x=pos.x, y=(pos.y+target.y)/2, z=pos.z}
    obj:get_luaentity().vmult = (target.y < pos.y) and -1 or 1
    -- Set the speed.
    obj:setvelocity({x=0, y=SPEED*obj:get_luaentity().vmult, z=0})
    obj:setacceleration({x=0, y=ACCEL*obj:get_luaentity().vmult, z=0})
    -- Set the tables.
    boxes[motorhash] = obj
    riding[sender:get_player_name()] = {
        motor = motorhash,
        pos = pos,
        target = target,
        box = obj,
    }
    return obj
end

-- Try to teleport player away from any closed (on) elevator node.
local function teleport_player_from_elevator(player)
    local function solid(pos)
        if not minetest.registered_nodes[minetest.get_node(pos).name] then
            return true
        end
        return minetest.registered_nodes[minetest.get_node(pos).name].walkable
    end
    local pos = vector.round(player:getpos())
    local node = minetest.get_node(pos)
    if node.name == "elevator:elevator_on" then
        local front = vector.subtract(pos, minetest.facedir_to_dir(node.param2))
        local front_above = vector.add(front, {x=0, y=1, z=0})
        local front_below = vector.subtract(front, {x=0, y=1, z=0})
        if not solid(front) and not solid(front_above) then
            player:setpos(front)
        end
    end
end

minetest.register_globalstep(function(dtime)
    time = time + dtime
    if time < 0.5 then
        return
    end
    time = 0
    -- Only count riders who are still logged in.
    local newriding = {}
    for _,p in ipairs(minetest.get_connected_players()) do
        local pos = p:getpos()
        newriding[p:get_player_name()] = riding[p:get_player_name()]
        if newriding[p:get_player_name()] then
            newriding[p:get_player_name()].pos = pos
        end
    end
    riding = newriding
    for name,r in pairs(riding) do
        -- If the box is no longer loaded or existent, create another.
        local ok = r.box and r.box.getpos and r.box:getpos() and r.box:get_luaentity() and r.box:get_luaentity().attached == name
        if not ok then
            minetest.log("action", "[elevator] "..minetest.pos_to_string(r.pos).." created due to lost rider.")
            minetest.after(0, create_box, r.motor, r.pos, r.target, minetest.get_player_by_name(name))
        end
    end
    -- Ensure boxes are deleted after <PTIMEOUT> seconds if there are no players nearby.
    for motor,obj in pairs(boxes) do
        if type(obj) ~= "table" then
            return
        end
        lastboxes[motor] = lastboxes[motor] and math.min(lastboxes[motor], PTIMEOUT) or PTIMEOUT
        lastboxes[motor] = math.max(lastboxes[motor] - 1, 0)
        local pos = obj:getpos()
        if pos then
            for _,object in ipairs(minetest.get_objects_inside_radius(pos, 5)) do
                if object.is_player and object:is_player() then
                    lastboxes[motor] = PTIMEOUT
                    break
                end
            end
            if lastboxes[motor] < 1 then
                minetest.log("action", "[elevator] "..minetest.pos_to_string(pos).." broke due to lack of players.")
                boxes[motor] = false
            end
        else
            minetest.log("action", "[elevator] "..minetest.pos_to_string(pos).." broke due to lack of position during player check.")
            boxes[motor] = false
        end
    end
end)

minetest.register_on_leaveplayer(function(player)
    -- We don't want players potentially logging into open elevators.
    teleport_player_from_elevator(player)
end)

local function phash(pos)
    return minetest.pos_to_string(pos)
end

-- Starting from <pos>, locate a motor hash.
local function locate_motor(pos)
    local p = vector.new(pos)
    while true do
        local node = get_node(p)
        if node.name == "elevator:elevator_on" or node.name == "elevator:elevator_off" then
            p.y = p.y + 2
        elseif node.name == "elevator:shaft" then
            p.y = p.y + 1
        elseif node.name == "elevator:motor" then
            return phash(p)
        else
            return nil
        end
    end
end

local function build_motor(hash)
    local need_saving = false
    local motor = elevator.motors[hash]
    if not motor then
        return
    end
    local p = minetest.string_to_pos(hash)
    local node = get_node(p)
    if node.name ~= "elevator:motor" then
        return
    end
    p.y = p.y - 1
    motor.elevators = {}
    motor.pnames = {}
    motor.labels = {}
    -- Run down through the shaft, storing information about elevators.
    while true do
        local node = get_node(p)
        if node.name == "elevator:shaft" then
            p.y = p.y - 1
        else
            p.y = p.y - 1
            local node = get_node(p)
            if node.name == "elevator:elevator_on" or node.name == "elevator:elevator_off" then
                table.insert(motor.elevators, phash(p))
                table.insert(motor.pnames, tostring(p.y))
                table.insert(motor.labels, "")
                p.y = p.y - 1
                need_saving = true
            else
                break
            end
        end
    end
    -- Set the elevators fully.
    for i,m in ipairs(motor.elevators) do
        local pos = minetest.string_to_pos(m)
        local meta = minetest.get_meta(pos)
        meta:set_int("version", VERSION)
        if meta:get_string("motor") ~= hash then
            build_motor(meta:get_string("motor"))
        end
        motor.labels[i] = meta:get_string("label")
        meta:set_string("motor", hash)
        if motor.labels[i] ~= meta:get_string("infotext") then
            meta:set_string("infotext", motor.labels[i])
        end
    end
    if need_saving then
        save_elevator()
    end
end

local function unbuild(pos, add)
    local need_saving = false
    local p = table.copy(pos)
    p.y = p.y - 1
    while true do
        local node = get_node(p)
        if node.name == "elevator:shaft" then
            p.y = p.y - 1
        else
            p.y = p.y - 1
            local node = get_node(p)
            if node.name == "elevator:elevator_on" or node.name == "elevator:elevator_off" then
                local meta = minetest.get_meta(p)
                meta:set_string("motor", "")
                p.y = p.y - 1
            else
                break
            end
        end
    end
    -- After a short delay, build the motor and handle box removal.
    minetest.after(0.01, function(p2, add)
        if not p2 or not add then
            return
        end
        p2.y = p2.y + add
        local motorhash = locate_motor(p2)
        build_motor(motorhash)
        -- If there's a box below this point, break it.
        if boxes[motorhash] and boxes[motorhash]:getpos() and p2.y >= boxes[motorhash]:getpos().y then
            boxes[motorhash] = nil
        end
        -- If the box does not exist, just clear it.
        if boxes[motorhash] and not boxes[motorhash]:getpos() then
            boxes[motorhash] = nil
        end
    end, table.copy(pos), add)
end

minetest.register_node("elevator:motor", {
    description = "Elevator Motor",
    tiles = {
        "default_steel_block.png",
        "default_steel_block.png",
        "elevator_motor.png",
        "elevator_motor.png",
        "elevator_motor.png",
        "elevator_motor.png",
    },
    groups = {cracky=1},
    sounds = default.node_sound_stone_defaults(),
    after_place_node = function(pos, placer, itemstack)
        elevator.motors[phash(pos)] = {
            elevators = {},
            pnames = {},
            labels = {},
        }
        save_elevator()
        build_motor(phash(pos))
    end,
    on_destruct = function(pos)
        boxes[phash(pos)] = nil
        elevator.motors[phash(pos)] = nil
        save_elevator()
    end,
})

for _,mode in ipairs({"on", "off"}) do
local nodename = "elevator:elevator_"..mode
local on = (mode == "on")
local box
local cbox
if on then
    box = {

        { 0.48, -0.5,-0.5,  0.5,  1.5, 0.5},
        {-0.5 , -0.5, 0.48, 0.48, 1.5, 0.5},
        {-0.5,  -0.5,-0.5 ,-0.48, 1.5, 0.5},

        { -0.5,-0.5,-0.5,0.5,-0.48, 0.5},
        { -0.5, 1.45,-0.5,0.5, 1.5, 0.5},
    }
    cbox = table.copy(box)
    cbox[5] = nil
else
    box = {

        { 0.48, -0.5,-0.5,  0.5,  1.5, 0.5},
        {-0.5 , -0.5, 0.48, 0.48, 1.5, 0.5},
        {-0.5,  -0.5,-0.5 ,-0.48, 1.5, 0.5},
        {-0.5 , -0.5, -0.48, 0.5, 1.5, -0.5},
    }
    cbox = box
end
minetest.register_node(nodename, {
    description = "Elevator",
    drawtype = "nodebox",
    sunlight_propagates = false,
    paramtype = 'light',
    paramtype2 = "facedir",
    on_rotate = screwdriver.disallow,

    selection_box = {
            type = "fixed",
            fixed = box,
    },

    collision_box = {
            type = "fixed",
            fixed = cbox,
    },

    node_box = {
            type = "fixed",
            fixed = box,
    },

    tiles = on and {
            "default_steel_block.png",
            "default_steel_block.png",
            "elevator_box.png",
            "elevator_box.png",
            "elevator_box.png",
            "elevator_box.png",
    } or {
            "elevator_box.png",
            "elevator_box.png",
            "elevator_box.png",
            "elevator_box.png",
            "elevator_box.png",
            "elevator_box.png",
    },
    groups = {cracky=1, choppy=1, snappy=1},
    drop = "elevator:elevator_off",

    light_source = (on and 4 or nil),

    after_place_node  = function(pos, placer, itemstack)
        local meta = minetest.get_meta(pos)
        meta:set_int("version", VERSION)
        local p = {x=pos.x, y=pos.y+1, z=pos.z}
        local p2 = minetest.dir_to_facedir(placer:get_look_dir())
        minetest.set_node(p, {name=placeholder, paramtype2="facedir", param2=p2})
        local motor = locate_motor(pos)
        if motor then
            build_motor(motor)
        end
    end,

    after_dig_node = function(pos, node, meta, digger)
        unbuild(pos, 2)
    end,

    on_place = function(itemstack, placer, pointed_thing)
       local pos  = pointed_thing.above
       local node = minetest.get_node({x=pos.x, y=pos.y+1, z=pos.z})
       if( node ~= nil and node.name ~= "air" and node.name ~= placeholder) then
          return
       end
       return minetest.item_place(itemstack, placer, pointed_thing);
    end,

    on_rightclick = function(pos, node, sender)
        local meta = minetest.get_meta(pos)
        formspecs[sender:get_player_name()] = {pos}
        if on then


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