-- Node definitions for Homedecor doors

local S = homedecor.gettext

-- doors

function isSolid(pos,adj)
    adj = vector.new(adj[1],adj[2],adj[3])
    local node = minetest.get_node(vector.add(pos,adj))
    if node then
        local idef = minetest.registered_nodes[minetest.get_node(vector.add(pos,adj)).name]
        if idef then
            return idef.walkable
        end
    end
    return false
end

function countSolids(pos,node,level)
    local solids = 0
    for x = -1, 1 do
        for z = -1, 1 do
            local y = 0
            if node.param2 == 5 then 
                y = -level 
            else
                y =  level
            end
            -- special cases when x == z == 0
            if x == 0 and z == 0 then
                if level == 1 then
                    -- when looking past the trap door, cannot be solid in center
                    if isSolid(pos,{x,y,z}) then
                        return false
                    end
                    -- no else. it doesn't matter if x == y == z is solid, that's us.
                end
            elseif isSolid(pos,{x,y,z}) then
                solids = solids + 1
            end
        end
    end
    return solids
end

function calculateClosed(pos)
    local node = minetest.get_node(pos)
    -- the door is considered closed if it is closing off something.

    local solids = 0
    local direction = node.param2 % 6
    local isTrap = direction == 0 or direction == 5
    if isTrap then
        -- the trap door is considered closed when all nodes on its sides are solid
        -- or all nodes in the 3x3 above/below it are solid except the center
        for levels = 0, 1 do
            local fail = false
            local solids = countSolids(pos,node,level)
            if solids == 8 then
                return true
            end
        end
        return false
    else
        -- the door is considered closed when the nodes on its sides are solid
        -- or the 3 nodes in its facing direction are solid nonsolid solid
        -- if the door has two levels (i.e. not a gate) then this must
        -- be true for the top node as well.

        -- sorry I dunno the math to figure whether to x or z
        if direction == 1 or direction == 2 then
            if isSolid(pos,{0,0,-1}) and isSolid(pos,{0,0,1}) then
                if string.find(node.name,'_bottom_') then
                    return calculateClosed({x=pos.x,y=pos.y+1,z=pos.z})
                else
                    return true
                end
            end
            local x
            if direction == 1 then
                x = 1
            else
                x = -1
            end
            if isSolid(pos,{x,0,-1}) and not isSolid(pos,{x,0,0}) and isSolid(pos,{x,0,1}) then
                if string.find(node.name,'_bottom_') then
                    return calculateClosed({x=pos.x,y=pos.y+1,z=pos.z})
                else
                    return true
                end
            end
            return false            
        else
            -- direction == 3 or 4                
            if isSolid(pos,{-1,0,0}) and isSolid(pos,{1,0,0}) then
                if string.find(node.name,'_bottom_') then
                    return calculateClosed({x=pos.x,y=pos.y+1,z=pos.z})
                else
                    return true
                end
            end
            local z
            if direction == 3 then
                z = 1
            else
                z = -1
            end
            if isSolid(pos,{-1,0,z}) and not isSolid(pos,{0,0,z}) and isSolid(pos,{1,0,z}) then
                if string.find(node.name,'_bottom_') then
                    return calculateClosed({x=pos.x,y=pos.y+1,z=pos.z})
                else
                    return true
                end
            end
            return false
        end
        error("What direction is this???",direction)
    end
end

-- isClosed flag, is 0 or 1 0 = open, 1 = closed
function getClosed(pos)
    local isClosed = minetest.get_meta(pos):get_string('closed')
    if isClosed=='' then
        if calculateClosed(pos) then
            return true
        else
            return false
        end
    else
        isClosed = tonumber(isClosed)
        -- may be closed or open (1 or 0)
        return isClosed == 1
    end
end

function addDoorNode(pos,def,isClosed)
    if isClosed then
        isClosed = 1
    else
        isClosed = 0
    end
    minetest.add_node(pos, def)
    minetest.get_meta(pos):set_int('closed',isClosed)
end

local sides = {"left", "right"}
local rsides = {"right", "left"}

for i in ipairs(sides) do
	local side = sides[i]
	local rside = rsides[i]

	for j in ipairs(homedecor.door_models) do
		local doorname =		homedecor.door_models[j][1]
		local doordesc =		homedecor.door_models[j][2]
		local nodeboxes_top = nil
		local nodeboxes_bottom = nil
		local texalpha = false
		if doorname == "exterior_fancy" then
			texalpha = true
		end

		if side == "left" then
			nodeboxes_top =	homedecor.door_models[j][3]
			nodeboxes_bottomtom =	homedecor.door_models[j][4]
		else
			nodeboxes_top =	homedecor.door_models[j][5]
			nodeboxes_bottomtom =	homedecor.door_models[j][6]
		end

		local lower_top_side = "homedecor_door_"..doorname.."_tb.png"
		local upper_bottom_side = "homedecor_door_"..doorname.."_tb.png"

		if doorname == "glass" then
			lower_top_side = "homedecor_blanktile.png"
			upper_bottom_side = "homedecor_blanktile.png"
		end

		local tiles_upper = {
				"homedecor_door_"..doorname.."_tb.png",
				upper_bottom_side,
				"homedecor_door_"..doorname.."_lrt.png",
				"homedecor_door_"..doorname.."_lrt.png",
				"homedecor_door_"..doorname.."_"..rside.."_top.png",
				"homedecor_door_"..doorname.."_"..side.."_top.png",
				}

		local tiles_lower = {
				lower_top_side,
				"homedecor_door_"..doorname.."_tb.png",
				"homedecor_door_"..doorname.."_lrb.png",
				"homedecor_door_"..doorname.."_lrb.png",
				"homedecor_door_"..doorname.."_"..rside.."_bottom.png",
				"homedecor_door_"..doorname.."_"..side.."_bottom.png",
				}

		local selectboxes_top = {
				type = "fixed",
				fixed = { -0.5, -1.5, 6/16, 0.5, 0.5, 8/16}
			}

		local selectboxes_bottom = {
				type = "fixed",
				fixed = { -0.5, -0.5, 6/16, 0.5, 1.5, 8/16}
			}

		minetest.register_node("homedecor:door_"..doorname.."_top_"..side, {
			description = doordesc.." "..S("(Top Half, %s-opening)"):format(side),
			drawtype = "nodebox",
			tiles = tiles_upper,
			paramtype = "light",
			paramtype2 = "facedir",
			groups = {snappy=3, not_in_creative_inventory=1},
			sounds = default.node_sound_wood_defaults(),
			walkable = true,
			use_texture_alpha = texalpha,
			selection_box = selectboxes_top,
			node_box = {
				type = "fixed",
				fixed = nodeboxes_top
			},
			drop = "homedecor:door_"..doorname.."_bottom_"..side,
			after_dig_node = function(pos, oldnode, oldmetadata, digger)
				if minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name == "homedecor:door_"..doorname.."_bottom_"..side then
					minetest.remove_node({x=pos.x, y=pos.y-1, z=pos.z})
				end
			end,
			on_rightclick = function(pos, node, clicker)
				homedecor.flip_door({x=pos.x, y=pos.y-1, z=pos.z}, node, clicker, doorname, side)
			end
		})

		minetest.register_node("homedecor:door_"..doorname.."_bottom_"..side, {
			description = doordesc.." "..S("(%s-opening)"):format(side),
			drawtype = "nodebox",
			tiles = tiles_lower,
			inventory_image = "homedecor_door_"..doorname.."_"..side.."_inv.png",
			paramtype = "light",
			paramtype2 = "facedir",
			groups = {snappy=3},
			sounds = default.node_sound_wood_defaults(),
			walkable = true,
			use_texture_alpha = texalpha,
			selection_box = selectboxes_bottom,
			node_box = {
				type = "fixed",
				fixed = nodeboxes_bottomtom
			},
			after_dig_node = function(pos, oldnode, oldmetadata, digger)
				if minetest.get_node({x=pos.x, y=pos.y+1, z=pos.z}).name == "homedecor:door_"..doorname.."_top_"..side then
					minetest.remove_node({x=pos.x, y=pos.y+1, z=pos.z})
				end
			end,
			on_place = function(itemstack, placer, pointed_thing)
				homedecor.place_door(itemstack, placer, pointed_thing, doorname, side)
				return itemstack
			end,
			on_rightclick = function(pos, node, clicker)
				homedecor.flip_door(pos, node, clicker, doorname, side)
			end,
            -- both left and right doors may be used for open or closed doors
            -- so they have to have both action_on and action_off and just
            -- check when that action is invoked if to continue

            on_punch = function(pos, node, puncher)
                minetest.get_meta(pos):set_string('closed',nil)
            end,
            mesecons = {
                effector = {
                    action_on = function(pos,node)
                        local isClosed = getClosed(pos)
                        if isClosed then
                            homedecor.flip_door(pos,node,nil,doorname,side,isClosed)
                        end
                    end,
                    action_off = function(pos,node)
                        local isClosed = getClosed(pos)
                        if not isClosed then
                            homedecor.flip_door(pos,node,nil,doorname,side,isClosed)
                        end
                    end
                }
            }
		})
	end
end

-- Gates

local gates_list = { "picket", "picket_white", "barbed_wire", "chainlink" }
local gate_names = { "Unpainted Picket", "White Picket", "Barbed Wire", "Chainlink" }

local gate_models_closed = {
	{{ -0.5, -0.5, 0.498, 0.5, 0.5, 0.498 }},

	{{ -0.5, -0.5, 0.498, 0.5, 0.5, 0.498 }},

	{{ -8/16, -8/16, 6/16, -6/16,  8/16,  8/16 },	-- left post
	 {  6/16, -8/16, 6/16,  8/16,  8/16,  8/16 }, 	-- right post
	 { -8/16,  7/16, 13/32, 8/16,  8/16, 15/32 },	-- top piece
	 { -8/16, -8/16, 13/32, 8/16, -7/16, 15/32 },	-- bottom piece
	 { -6/16, -8/16,  7/16, 6/16,  8/16,  7/16 }},	-- the wire

	{{ -8/16, -8/16,  6/16, -7/16,  8/16,  8/16 },	-- left post
	 {  6/16, -8/16,  6/16,  8/16,  8/16,  8/16 }, 	-- right post
	 { -8/16,  7/16, 13/32,  8/16,  8/16, 15/32 },	-- top piece
	 { -8/16, -8/16, 13/32,  8/16, -7/16, 15/32 },	-- bottom piece
	 { -8/16, -8/16,  7/16,  8/16,  8/16,  7/16 },	-- the chainlink itself
	 { -8/16, -3/16,  6/16, -6/16,  3/16,  8/16 }}	-- the lump representing the lock
}

local gate_models_open = {
	{{ 0.498, -0.5, -0.5, 0.498, 0.5, 0.5 }},

	{{ 0.498, -0.5, -0.5, 0.498, 0.5, 0.5 }},
	
	{{  6/16, -8/16, -8/16,  8/16,  8/16, -6/16 },	-- left post
	 {  6/16, -8/16,  6/16,  8/16,  8/16,  8/16 }, 	-- right post
	 { 13/32,  7/16, -8/16, 15/32,  8/16,  8/16 },	-- top piece
	 { 13/32, -8/16, -8/16, 15/32, -7/16,  8/16 },	-- bottom piece
	 {  7/16, -8/16, -6/16,  7/16,  8/16,  6/16 }},	-- the wire

	{{  6/16, -8/16, -8/16,  8/16,  8/16, -7/16 },	-- left post
	 {  6/16, -8/16,  6/16,  8/16,  8/16,  8/16 }, 	-- right post
	 { 13/32,  7/16, -8/16, 15/32,  8/16,  8/16 },	-- top piece
	 { 13/32, -8/16, -8/16, 15/32, -7/16,  8/16 },	-- bottom piece
	 {  7/16, -8/16, -8/16,  7/16,  8/16,  8/16 },	-- the chainlink itself
	 {  6/16, -3/16, -8/16,  8/16,  3/16, -6/16 }}	-- the lump representing the lock
}

for i in ipairs(gates_list) do

	local gate=gates_list[i]

    local def = {
		drawtype = "nodebox",
		description = S(gate_names[i].." Fence Gate"),
		tiles = {
			"homedecor_gate_"..gate.."_top.png",
			"homedecor_gate_"..gate.."_bottom.png",
			"homedecor_gate_"..gate.."_left.png",
			"homedecor_gate_"..gate.."_right.png",
			"homedecor_gate_"..gate.."_back.png",
			"homedecor_gate_"..gate.."_front.png"
		},
		paramtype = "light",
		is_ground_content = true,
		groups = {snappy=3},
		sounds = default.node_sound_wood_defaults(),
		walkable = true,
		paramtype2 = "facedir",
		selection_box = {
			type = "fixed",
			fixed = { -0.5, -0.5, 0.4, 0.5, 0.5, 0.5 }
		},
		node_box = {
			type = "fixed",
			fixed = gate_models_closed[i]
		},
		on_rightclick = function(pos, node, clicker)
			homedecor.flip_gate(pos, node, clicker, gate, "closed")
		end,
        mesecons = {
            effector = {
                action_on = function(pos,node) homedecor.flip_gate(pos,node,player,gate, "closed") end
            }
        }
	}

    -- gates when placed default to closed, closed.

	minetest.register_node("homedecor:gate_"..gate.."_closed", def)

    -- this is either a terrible idea or a great one
    def = table.copy(def)
    def.groups.not_in_creative_inventory = 1
    def.selection_box.fixed = { 0.4, -0.5, -0.5, 0.5, 0.5, 0.5 }
    def.tiles = {
		"homedecor_gate_"..gate.."_top.png",
		"homedecor_gate_"..gate.."_bottom.png",
		"homedecor_gate_"..gate.."_front.png",
		"homedecor_gate_"..gate.."_back.png",
		"homedecor_gate_"..gate.."_left.png",
        "homedecor_gate_"..gate.."_right.png"
    }
    def.node_box.fixed = gate_models_open[i]
    def.drop = "homedecor:gate_"..gate.."_closed"
	def.on_rightclick = function(pos, node, clicker)
        homedecor.flip_gate(pos, node, clicker, gate, "open")
	end
    def.mesecons.effector = {
        action_off = function(pos,node) homedecor.flip_gate(pos,node,player,gate, "open") end
    }

	minetest.register_node("homedecor:gate_"..gate.."_open", def)
end

minetest.register_alias("homedecor:fence_barbed_wire_gate_open",    "homedecor:gate_barbed_wire_open")
minetest.register_alias("homedecor:fence_barbed_wire_gate_closed",  "homedecor:gate_barbed_wire_closed")
minetest.register_alias("homedecor:fence_chainlink_gate_open",      "homedecor:gate_chainlink_open")
minetest.register_alias("homedecor:fence_chainlink_gate_closed",    "homedecor:gate_chainlink_closed")
minetest.register_alias("homedecor:fence_picket_gate_open",         "homedecor:gate_picket_open")
minetest.register_alias("homedecor:fence_picket_gate_closed",       "homedecor:gate_picket_closed")
minetest.register_alias("homedecor:fence_picket_gate_white_open",   "homedecor:gate_picket_white_open")
minetest.register_alias("homedecor:fence_picket_gate_white_closed", "homedecor:gate_picket_white_closed")

----- helper functions

local function get_nodedef_field(nodename, fieldname)
	if not minetest.registered_nodes[nodename] then
		return nil
	end
	return minetest.registered_nodes[nodename][fieldname]
end

function homedecor.place_door(itemstack, placer, pointed_thing, name, side)

	local pointed = pointed_thing.under
	local pnode = minetest.get_node(pointed)
	local pname = pnode.name

	if not minetest.registered_nodes[pname]
	    or not minetest.registered_nodes[pname].on_rightclick then

		local pos1 = nil
		local pos2 = nil

		if minetest.registered_nodes[pname]["buildable_to"] then
			pos1 = pointed
			pos2 = {x=pointed.x, y=pointed.y+1, z=pointed.z}
		else
			pos1 = pointed_thing.above
			pos2 = {x=pointed_thing.above.x, y=pointed_thing.above.y+1, z=pointed_thing.above.z}
		end

		local node_bottom = minetest.get_node(pos1)
		local node_top = minetest.get_node(pos2)

		if not homedecor:node_is_owned(pos1, placer) 
		    and not homedecor:node_is_owned(pos2, placer) then

			if not get_nodedef_field(node_bottom.name, "buildable_to") 
			    or not get_nodedef_field(node_top.name, "buildable_to") then
				minetest.chat_send_player( placer:get_player_name(), S('Not enough space above that spot to place a door!') )
			else
				local fdir = minetest.dir_to_facedir(placer:get_look_dir())
                local def = { name = "homedecor:door_"..name.."_bottom_"..side, param2=fdir}
                addDoorNode(pos1, def, true)
				minetest.add_node(pos2, { name = "homedecor:door_"..name.."_top_"..side, param2=fdir})
				if not homedecor.expect_infinite_stacks then
					itemstack:take_item()
					return itemstack
				end
			end
		end
	else
		minetest.registered_nodes[pname].on_rightclick(pointed_thing.under, pnode, placer, itemstack)
	end
end

-- to open a door, you switch left for right and subtract from param2, or vice versa right for left
-- that is to say open "right" doors become left door nodes, and open left doors right door nodes.
-- also adjusting param2 so the node is at 90 degrees.

function homedecor.flip_door(pos, node, player, name, side, isClosed)
    if isClosed == nil then
        isClosed = getClosed(pos)
    end
    -- this is where we swap the isClosed status!
    -- i.e. if isClosed, we're adding an open door
    -- and if not isClosed, a closed door
    isClosed = not isClosed

	local rside = nil
	local nfdir = nil
	if side == "left" then
		rside = "right"
		nfdir=node.param2 - 1
		if nfdir < 0 then nfdir = 3 end
	else
		rside = "left"
		nfdir=node.param2 + 1
		if nfdir > 3 then nfdir = 0 end
	end
    local sound;
    if isClosed then
        sound = 'close'
    else
        sound = 'open'
    end
	minetest.sound_play("homedecor_door_"..sound, {
		pos=pos,
        max_hear_distance = 5,
		gain = 2,
	})
    -- XXX: does the top half have to remember open/closed too?
	minetest.add_node({x=pos.x, y=pos.y+1, z=pos.z}, { name =  "homedecor:door_"..name.."_top_"..rside, param2=nfdir})

    addDoorNode(pos,{ name = "homedecor:door_"..name.."_bottom_"..rside, param2=nfdir },isClosed)
end

function homedecor.flip_gate(pos, node, player, gate, oc)
    local isClosed = getClosed(pos);
    minetest.sound_play("homedecor_gate_open_close", {
		pos=pos,
		max_hear_distance = 5,
		gain = 2,
	})

	local fdir = node.param2

    -- since right facing gates use "open" nodes for closed, we need an
    -- isClosed flag to tell if it's "really" closed.

	if oc == "closed" then
		gateresult = "homedecor:gate_"..gate.."_open"
	else
		gateresult = "homedecor:gate_"..gate.."_closed"
	end

    local def = {name=gateresult, param2=fdir}

    addDoorNode(pos, def, isClosed)

    -- the following opens and closes gates below and above in sync with this one
    -- (without three gate open/close sounds)

    local above = {x=pos.x, y=pos.y+1, z=pos.z}
    local below = {x=pos.x, y=pos.y-1, z=pos.z}
    local nodeabove = minetest.get_node(above)
    local nodebelow = minetest.get_node(below)

	if string.find(nodeabove.name, "homedecor:gate_"..gate) then
        addDoorNode(above, def, isClosed)
	end

	if string.find(nodebelow.name, "homedecor:gate_"..gate) then
        addDoorNode(below, def, isClosed)
	end
end