mappointer = {}
mappointer.points = {}
mappointer.count = 1
local S = signs_lib.gettext
local MAX_INPUT_CHARS = 400
local function trim_input(text)
        return text:sub(1, math.min(MAX_INPUT_CHARS, text:len()))
end
local function make_infotext(text)
        text = trim_input(text)
        local lines = signs_lib.split_lines_and_words(text) or {}
        local lines2 = { }
        for _, line in ipairs(lines) do
                table.insert(lines2, (table.concat(line, " "):gsub("#[0-9a-fA-F#^]", function (s)
                        return s:sub(2):find("[#^]") and s:sub(2) or ""
                end)))
        end
        return table.concat(lines2, "\n")
end

function mappointer.update_sign(pos, fields)
        local meta = minetest.get_meta(pos)

        -- legacy udpate
        if meta:get_string("formspec") ~= "" then
                meta:set_string("formspec", "")
        end

        local text = fields and fields.text or meta:get_string("text")
        local poiType = fields and fields.poiType or meta:get_string("poiType")
        text = trim_input(text)

        local owner = meta:get_string("owner")
        local ownstr = ""
        if owner ~= "" then ownstr = S("Locked sign, owned by @1\n", owner) end

        meta:set_string("text", text)
        meta:set_string("infotext", ownstr..make_infotext(text).." ")

        local glow = meta:get_string("glow")
        signs_lib.set_obj_text(pos, text, glow)
	local found = false
	for i, poi in pairs(mappointer.points) do
            if poi['pos']['x'] == pos.x and
                poi['pos']['y'] == pos.y and
                poi['pos']['z'] == pos.z then
		found = true
		poi.text = text
		poi.type = poiType
            end
        end
	if found == false then
		table.insert(mappointer.points, {pos=pos, text=text, type=poiType})
	end
	mappointer.save_data()
end

function mappointer.get_sign_formspec(pos, nodename)

        local meta = minetest.get_meta(pos)
        local txt = meta:get_string("text")
        local state = meta:get_int("unifont") == 1 and "on" or "off"

        local formspec = {
                "size[6,4.8]",
                "background[-0.5,-0.5;7,5;signs_lib_sign_bg.png]",
                "image[0.1,3;7,1;signs_lib_sign_color_palette.png]",
                "textarea[0.15,-0.2;6.3,2.8;text;;" .. minetest.formspec_escape(txt) .. "]",
		"dropdown[0.1,2.2;6.1,0;poiType;Building,Travelnet,Point of Interest,Other;1]",
                "button_exit[3.7,4.2;2,1;ok;" .. S("Write") .. "]",
                "label[0.3,4;Unicode font]",
                "image_button[0.6,4.3;1,0.6;signs_lib_switch_" .. state .. ".png;uni_"
                        .. state .. ";;;false;signs_lib_switch_interm.png]",
        }

        if minetest.registered_nodes[nodename].allow_widefont then
                state = meta:get_int("widefont") == 1 and "on" or "off"
                formspec[#formspec+1] = "label[2.1,4;Wide font]"
                formspec[#formspec+1] = "image_button[2.3,4.3;1,0.6;signs_lib_switch_" .. state .. ".png;wide_"
                                .. state .. ";;;false;signs_lib_switch_interm.png]"
        end

        return table.concat(formspec, "")
end

function mappointer.rightclick_sign(pos, node, player, itemstack, pointed_thing)

        if not player or not signs_lib.can_modify(pos, player) then return end

        player:get_meta():set_string("signslib:pos", minetest.pos_to_string(pos))
	minetest.log("test open formspec")
        minetest.show_formspec(player:get_player_name(), "mappointer:poi", mappointer.get_sign_formspec(pos, node.name))
	minetest.log("test close formspec")
end

mappointer.save_data = function()
    local data = minetest.write_json(mappointer.points);
    local path = minetest.get_worldpath().."/mod_poi.data";

    local file = io.open( path, "w" );
    if( file ) then
        file:write( data );
        file:close();
    else
        print("[Mod mappointer] Error: Savefile '"..tostring( path ).."' could not be written.");
    end
end

mappointer.restore_data = function()
    local path = minetest.get_worldpath().."/mod_poi.data";
    local file = io.open( path, "r" );
    if(file) then
        local data = file:read("*all");
        mappointer.points = minetest.parse_json(data);
        file:close();
	if mappointer.points == nil then mappointer.points = {} end
	for _ in pairs(mappointer.points) do mappointer.count = mappointer.count + 1 end
    else
        print("[Mod mappointer] Error: Read file '"..tostring( path ).."': not found.");
    end
end

minetest.register_on_player_receive_fields(function(player, formname, fields)

        if formname ~= "mappointer:poi" then return end

        local pos_string = player:get_meta():get_string("signslib:pos")
        local pos = minetest.string_to_pos(pos_string)
        local playername = player:get_player_name()

        if fields.text and fields.ok then
                minetest.log("action", S("@1 wrote \"@2\" to sign at @3 of type @4",
                        (playername or ""),
                        fields.text:gsub('\\', '\\\\'):gsub("\n", "\\n"),
                        pos_string,
			fields.poiType
                ))
                mappointer.update_sign(pos, fields)
        elseif fields.wide_on or fields.wide_off or fields.uni_on or fields.uni_off then
                local node = minetest.get_node(pos)
                local meta = minetest.get_meta(pos)
                local change_wide
                local change_uni

                if fields.wide_on and meta:get_int("widefont") == 1 then
                        meta:set_int("widefont", 0)
                        change_wide = true
                elseif fields.wide_off and meta:get_int("widefont") == 0 then
                        meta:set_int("widefont", 1)
                        change_wide = true
                end
                if fields.uni_on and meta:get_int("unifont") == 1 then
                        meta:set_int("unifont", 0)
                        change_uni = true
                elseif fields.uni_off and meta:get_int("unifont") == 0 then
                        meta:set_int("unifont", 1)
                        change_uni = true
                end

                if change_wide then
                        minetest.log("action", S("@1 flipped the wide-font switch to \"@2\" at @3",
                                (playername or ""),
                                (fields.wide_on and "off" or "on"),
                                minetest.pos_to_string(pos)
                        ))
                        mappointer.update_sign(pos, fields)
                        minetest.show_formspec(playername, "mappointer:poi", mappointer.get_sign_formspec(pos, node.name))
                end
                if change_uni then
                        minetest.log("action", S("@1 flipped the unicode-font switch to \"@2\" at @3",
                                (playername or ""),
                                (fields.uni_on and "off" or "on"),
                                minetest.pos_to_string(pos)
                        ))
                        mappointer.update_sign(pos, fields)
                        minetest.show_formspec(playername, "mappointer:poi", mappointer.get_sign_formspec(pos, node.name))
                end
        end
end)

function mappointer.destruct_sign(pos)
        local meta = minetest.get_meta(pos)
        local glow = meta:get_string("glow")
        if glow ~= "" and not minetest.is_creative_enabled("") then
                local num = tonumber(glow)
                minetest.add_item(pos, ItemStack(signs_lib.glow_item .. " " .. num))
        end
        signs_lib.delete_objects(pos)
	for i, poi in pairs(mappointer.points) do
	    minetest.log("about to remove "..i)
            if poi['pos']['x'] == pos.x and
                poi['pos']['y'] == pos.y and
                poi['pos']['z'] == pos.z then
		minetest.log("removed poi")
                table.remove(mappointer.points, i)
            end
        end
	mappointer.save_data()
end

signs_lib.register_sign("mappointer:point_of_interest", {
        description = "Sign for POI",
        inventory_image = "signs_lib_sign_wall_steel_inv.png",
        tiles = {
                "signs_lib_sign_wall_steel.png",
                "signs_lib_sign_wall_steel_edges.png",
                nil, -- not set, so it'll use the standard pole mount texture
                nil, -- not set, so it'll use the standard hanging chains texture
                "default_steel_block.png" -- for the yard sign's stick
        },
        groups = signs_lib.standard_steel_groups,
        sounds = signs_lib.standard_steel_sign_sounds,
        locked = true,
        entity_info = "standard",
        allow_hanging = true,
        allow_widefont = true,
        allow_onpole = true,
        allow_onpole_horizontal = true,
        allow_yard = true,
        use_texture_alpha = "clip",
	on_punch = mappointer.update_sign,
	on_rightclick = mappointer.rightclick_sign,
	on_destruct = mappointer.destruct_sign,
})

minetest.register_craft({
    output = 'mappointer:point_of_interest',
    recipe = {
        {'default:sign_wall_steel', 'default:book'},
    }
})

mappointer.restore_data()