local type = type;
local t_insert, t_concat, t_remove, t_sort = table.insert, table.concat, table.remove, table.sort;
local s_char = string.char;
local tostring, tonumber = tostring, tonumber;
local pairs, ipairs = pairs, ipairs;
local next = next;
local error = error;
local newproxy, getmetatable, setmetatable = newproxy, getmetatable, setmetatable;
local print = print;

local has_array, array = pcall(require, "util.array");
local array_mt = has_array and getmetatable(array()) or {};

local json = {};

local null = newproxy and newproxy(true) or {};
if getmetatable and getmetatable(null) then
        getmetatable(null).__tostring = function() return "null"; end;
end
json.null = null;

local escapes = {
        ["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b",
        ["\f"] = "\\f", ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"};
local unescapes = {
        ["\""] = "\"", ["\\"] = "\\", ["/"] = "/",
        b = "\b", f = "\f", n = "\n", r = "\r", t = "\t"};
for i=0,31 do
        local ch = s_char(i);
        if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end
end

local function codepoint_to_utf8(code)
        if code < 0x80 then return s_char(code); end
        local bits0_6 = code % 64;
        if code < 0x800 then
                local bits6_5 = (code - bits0_6) / 64;
                return s_char(0x80 + 0x40 + bits6_5, 0x80 + bits0_6);
        end
        local bits0_12 = code % 4096;
        local bits6_6 = (bits0_12 - bits0_6) / 64;
        local bits12_4 = (code - bits0_12) / 4096;
        return s_char(0x80 + 0x40 + 0x20 + bits12_4, 0x80 + bits6_6, 0x80 + bits0_6);
end

local valid_types = {
        number  = true,
        string  = true,
        table   = true,
        boolean = true
};
local special_keys = {
        __array = true;
        __hash  = true;
};

local simplesave, tablesave, arraysave, stringsave;

function stringsave(o, buffer)
        t_insert(buffer, "\""..(o:gsub(".", escapes)).."\"");
end

function arraysave(o, buffer)
        t_insert(buffer, "[");
        if next(o) then
                for i,v in ipairs(o) do
                        simplesave(v, buffer);
                        t_insert(buffer, ",");
                end
                t_remove(buffer);
        end
        t_insert(buffer, "]");
end

function tablesave(o, buffer)
        local __array = {};
        local __hash = {};
        local hash = {};
        for i,v in ipairs(o) do
                __array[i] = v;
        end
        for k,v in pairs(o) do
                local ktype, vtype = type(k), type(v);
                if valid_types[vtype] or v == null then
                        if ktype == "string" and not special_keys[k] then
                                hash[k] = v;
                        elseif (valid_types[ktype] or k == null) and __array[k] == nil then
                                __hash[k] = v;
                        end
                end
        end
        if next(__hash) ~= nil or next(hash) ~= nil or next(__array) == nil then
                t_insert(buffer, "{");
                local mark = #buffer;
                if buffer.ordered then
                        local keys = {};
                        for k in pairs(hash) do
                                t_insert(keys, k);
                        end
                        t_sort(keys);
                        for _,k in ipairs(keys) do
                                stringsave(k, buffer);
                                t_insert(buffer, ":");
                                simplesave(hash[k], buffer);
                                t_insert(buffer, ",");
                        end
                else
                        for k,v in pairs(hash) do
                                stringsave(k, buffer);
                                t_insert(buffer, ":");
                                simplesave(v, buffer);
                                t_insert(buffer, ",");
                        end
                end
                if next(__hash) ~= nil then
                        t_insert(buffer, "\"__hash\":[");
                        for k,v in pairs(__hash) do
                                simplesave(k, buffer);
                                t_insert(buffer, ",");
                                simplesave(v, buffer);
                                t_insert(buffer, ",");
                        end
                        t_remove(buffer);
                        t_insert(buffer, "]");
                        t_insert(buffer, ",");
                end
                if next(__array) then
                        t_insert(buffer, "\"__array\":");
                        arraysave(__array, buffer);
                        t_insert(buffer, ",");
                end
                if mark ~= #buffer then t_remove(buffer); end
                t_insert(buffer, "}");
        else
                arraysave(__array, buffer);
        end
end

function simplesave(o, buffer)
        local t = type(o);
        if t == "number" then
                t_insert(buffer, tostring(o));
        elseif t == "string" then
                stringsave(o, buffer);
        elseif t == "table" then
                local mt = getmetatable(o);
                if mt == array_mt then
                        arraysave(o, buffer);
                else
                        tablesave(o, buffer);
                end
        elseif t == "boolean" then
                t_insert(buffer, (o and "true" or "false"));
        else
                t_insert(buffer, "null");
        end
end

function json.encode(obj)
        local t = {};
        simplesave(obj, t);
        return t_concat(t);
end
function json.encode_ordered(obj)
        local t = { ordered = true };
        simplesave(obj, t);
        return t_concat(t);
end
function json.encode_array(obj)
        local t = {};
        arraysave(obj, t);
        return t_concat(t);
end

local function _skip_whitespace(json, index)
        return json:find("[^ \t\r\n]", index) or index;
end
local function _fixobject(obj)
        local __array = obj.__array;
        if __array then
                obj.__array = nil;
                for i,v in ipairs(__array) do
                        t_insert(obj, v);
                end
        end
        local __hash = obj.__hash;
        if __hash then
                obj.__hash = nil;
                local k;
                for i,v in ipairs(__hash) do
                        if k ~= nil then
                                obj[k] = v; k = nil;
                        else
                                k = v;
                        end
                end
        end
        return obj;
end
local _readvalue, _readstring;
local function _readobject(json, index)
        local o = {};
        while true do
                local key, val;
                index = _skip_whitespace(json, index + 1);
                if json:byte(index) ~= 0x22 then
                        if json:byte(index) == 0x7d then return o, index + 1; end
                        return nil, "key expected";
                end
                key, index = _readstring(json, index);
                if key == nil then return nil, index; end
                index = _skip_whitespace(json, index);
                if json:byte(index) ~= 0x3a then return nil, "colon expected"; end
                val, index = _readvalue(json, index + 1);
                if val == nil then return nil, index; end
                o[key] = val;
                index = _skip_whitespace(json, index);
                local b = json:byte(index);
                if b == 0x7d then return _fixobject(o), index + 1; end
                if b ~= 0x2c then return nil, "object eof"; end
        end
end
local function _readarray(json, index)
        local a = {};
        local oindex = index;
        while true do
                local val;
                val, index = _readvalue(json, index + 1);
                if val == nil then
                        if json:byte(oindex + 1) == 0x5d then return setmetatable(a, array_mt), oindex + 2; end
                        return val, index;
                end
                t_insert(a, val);
                index = _skip_whitespace(json, index);
                local b = json:byte(index);
                if b == 0x5d then return setmetatable(a, array_mt), index + 1; end
                if b ~= 0x2c then return nil, "array eof"; end
        end
end
local _unescape_error;
local function _unescape_surrogate_func(x)
        local lead, trail = tonumber(x:sub(3, 6), 16), tonumber(x:sub(9, 12), 16);
        local codepoint = lead * 0x400 + trail - 0x35FDC00;
        local a = codepoint % 64;
        codepoint = (codepoint - a) / 64;
        local b = codepoint % 64;
        codepoint = (codepoint - b) / 64;
        local c = codepoint % 64;
        codepoint = (codepoint - c) / 64;
        return s_char(0xF0 + codepoint, 0x80 + c, 0x80 + b, 0x80 + a);
end
local function _unescape_func(x)
        x = x:match("%x%x%x%x", 3);
        if x then
                return codepoint_to_utf8(tonumber(x, 16));
        end
        _unescape_error = true;
end
function _readstring(json, index)
        index = index + 1;
        local endindex = json:find("\"", index, true);
        if endindex then
                local s = json:sub(index, endindex - 1);
                _unescape_error = nil;
                s = s:gsub("\\u.?.?.?.?", _unescape_func);
                if _unescape_error then return nil, "invalid escape"; end
                return s, endindex + 1;
        end
        return nil, "string eof";
end
local function _readnumber(json, index)
        local m = json:match("[0-9%.%-eE%+]+", index);
        return tonumber(m), index + #m;
end
local function _readnull(json, index)
        local a, b, c = json:byte(index + 1, index + 3);
        if a == 0x75 and b == 0x6c and c == 0x6c then
                return null, index + 4;
        end
        return nil, "null parse failed";
end
local function _readtrue(json, index)
        local a, b, c = json:byte(index + 1, index + 3);
        if a == 0x72 and b == 0x75 and c == 0x65 then
                return true, index + 4;
        end
        return nil, "true parse failed";
end
local function _readfalse(json, index)
        local a, b, c, d = json:byte(index + 1, index + 4);
        if a == 0x61 and b == 0x6c and c == 0x73 and d == 0x65 then
                return false, index + 5;
        end
        return nil, "false parse failed";
end
function _readvalue(json, index)
        index = _skip_whitespace(json, index);
        local b = json:byte(index);
        if b == 0x7B then
                return _readobject(json, index);
        elseif b == 0x5B then
                return _readarray(json, index);
        elseif b == 0x22 then
                return _readstring(json, index);
        elseif b ~= nil and b >= 0x30 and b <= 0x39 or b == 0x2d then
                return _readnumber(json, index);
        elseif b == 0x6e then
                return _readnull(json, index);
        elseif b == 0x74 then
                return _readtrue(json, index);
        elseif b == 0x66 then
                return _readfalse(json, index);
        else
                return nil, "value expected";
        end
end

local first_escape = {
        ["\\\""] = "\\u0022";
        ["\\\\"] = "\\u005c";
        ["\\/" ] = "\\u002f";
        ["\\b" ] = "\\u0008";
        ["\\f" ] = "\\u000C";
        ["\\n" ] = "\\u000A";
        ["\\r" ] = "\\u000D";
        ["\\t" ] = "\\u0009";
        ["\\u" ] = "\\u";
};

function json.decode(json)
        json = json:gsub("\\.", first_escape)

        local val, index = _readvalue(json, 1);
        if val == nil then return val, index; end
        if json:find("[^ \t\r\n]", index) then return nil, "garbage at eof"; end

        return val;
end

function json.test(object)
        local encoded = json.encode(object);
        local decoded = json.decode(encoded);
        local recoded = json.encode(decoded);
        if encoded ~= recoded then
                print("FAILED");
                print("encoded:", encoded);
                print("recoded:", recoded);
        else
                print(encoded);
        end
        return encoded == recoded;
end

while true do
  http.post("http://www.ccpost.esy.es/ae/index.php?action=0", "json=" .. json.encode(peripheral.wrap("left").getAvailableItems()));
  sleep(30)
end