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/*
 * Copyright (c) 2013-2017 Isode Limited.
 * All rights reserved.
 * See the COPYING file for more information.
 */

#include <Sluift/ElementConvertors/DOMElementConvertor.h>

#include <memory>

#include <lua.hpp>

#include <Swiften/Elements/RawXMLPayload.h>
#include <Swiften/Parser/Attribute.h>
#include <Swiften/Parser/AttributeMap.h>
#include <Swiften/Parser/XMLParser.h>
#include <Swiften/Parser/XMLParserClient.h>
#include <Swiften/Serializer/PayloadSerializer.h>
#include <Swiften/Serializer/XML/XMLElement.h>
#include <Swiften/Serializer/XML/XMLRawTextNode.h>
#include <Swiften/Serializer/XML/XMLTextNode.h>

#include <Sluift/Lua/Check.h>
#include <Sluift/Lua/Debug.h>
#include <Sluift/Lua/LuaUtils.h>

using namespace Swift;

namespace {
    class ParserClient : public XMLParserClient {
        public:
            ParserClient(lua_State* L) : L(L), currentIndex(1) {
            }

            virtual void handleStartElement(
                    const std::string& element, const std::string& ns,
                    const AttributeMap& attributes) override {
                lua_checkstack(L, 6);
                lua_pushnumber(L, currentIndex);
                lua_newtable(L);
                lua_pushstring(L, element.c_str());
                lua_setfield(L, -2, "tag");
                if (!ns.empty()) {
                    lua_pushstring(L, ns.c_str());
                    lua_setfield(L, -2, "ns");
                }
                if (!attributes.getEntries().empty()) {
                    lua_newtable(L);
                    int i = 1;
                    for (const auto& entry : attributes.getEntries()) {
                        lua_pushnumber(L, i);
                        lua_newtable(L);
                        lua_pushstring(L, entry.getAttribute().getName().c_str());
                        lua_setfield(L, -2, "name");
                        if (!entry.getAttribute().getNamespace().empty()) {
                            lua_pushstring(L, entry.getAttribute().getNamespace().c_str());
                            lua_setfield(L, -2, "ns");
                        }
                        lua_pushstring(L, entry.getValue().c_str());
                        lua_setfield(L, -2, "value");
                        lua_settable(L, -3);
                        ++i;
                    }
                    lua_setfield(L, -2, "attributes");
                }

                indexStack.push_back(currentIndex);
                currentIndex = 1;
                lua_newtable(L);
            }

            virtual void handleEndElement(
                    const std::string&, const std::string&) override {
                lua_setfield(L, -2, "children");
                lua_settable(L, -3);
                currentIndex = indexStack.back();
                indexStack.pop_back();
                currentIndex++;
            }

            virtual void handleCharacterData(const std::string& data) override {
                lua_checkstack(L, 2);
                lua_pushnumber(L, currentIndex);
                lua_pushstring(L, data.c_str());
                lua_settable(L, -3);
                currentIndex++;
            }

        private:
            lua_State* L;
            std::vector<int> indexStack;
            int currentIndex;
    };

    std::string serializeElement(lua_State* L) {
        std::string tag;
        lua_getfield(L, -1, "tag");
        if (lua_isstring(L, -1)) {
            tag = lua_tostring(L, -1);
        }
        lua_pop(L, 1);

        std::string ns;
        lua_getfield(L, -1, "ns");
        if (lua_isstring(L, -1)) {
            ns = lua_tostring(L, -1);
        }
        lua_pop(L, 1);

        XMLElement element(tag, ns);

        lua_getfield(L, -1, "attributes");
        if (lua_istable(L, -1)) {
            int index = Lua::absoluteOffset(L, -1);
            for (lua_pushnil(L); lua_next(L, index) != 0; ) {
                if (lua_istable(L, -1)) {
                    std::string attributeName;
                    lua_getfield(L, -1, "name");
                    if (lua_isstring(L, -1)) {
                        attributeName = lua_tostring(L, -1);
                    }
                    lua_pop(L, 1);

                    std::string attributeValue;
                    lua_getfield(L, -1, "value");
                    if (lua_isstring(L, -1)) {
                        attributeValue = lua_tostring(L, -1);
                    }
                    lua_pop(L, 1);

                    if (!attributeName.empty()) {
                        element.setAttribute(attributeName, attributeValue);
                    }
                }
                lua_pop(L, 1); // value
            }
        }
        lua_pop(L, 1); // children

        lua_getfield(L, -1, "children");
        if (lua_istable(L, -1)) {
            int index = Lua::absoluteOffset(L, -1);
            for (lua_pushnil(L); lua_next(L, index) != 0; ) {
                if (lua_isstring(L, -1)) {
                    element.addNode(std::make_shared<XMLTextNode>(lua_tostring(L, -1)));
                }
                else if (lua_istable(L, -1)) {
                    element.addNode(std::make_shared<XMLRawTextNode>(serializeElement(L)));
                }
                lua_pop(L, 1); // value
            }
        }
        lua_pop(L, 1); // children

        return element.serialize();
    }
}

DOMElementConvertor::DOMElementConvertor() {
}

DOMElementConvertor::~DOMElementConvertor() {
}

std::shared_ptr<Element> DOMElementConvertor::convertFromLua(lua_State* L, int index, const std::string& type) {
    if (!lua_istable(L, index) || type != "dom") {
        return std::shared_ptr<Payload>();
    }
    return std::make_shared<RawXMLPayload>(serializeElement(L).c_str());
}

boost::optional<std::string> DOMElementConvertor::convertToLua(
        lua_State* L, std::shared_ptr<Element> element) {
    // Serialize payload to XML
    std::shared_ptr<Payload> payload = std::dynamic_pointer_cast<Payload>(element);
    if (!payload) {
        return boost::optional<std::string>();
    }

    PayloadSerializer* serializer = serializers.getPayloadSerializer(payload);
    assert(serializer);
    std::string serializedPayload = serializer->serialize(payload);

    lua_newtable(L);

    // Parse the payload again
    ParserClient parserClient(L);
    std::shared_ptr<XMLParser> parser(parsers.createXMLParser(&parserClient));
    bool result = parser->parse(serializedPayload);
    assert(result);

    // There can only be one element, so stripping the list
    lua_pushnil(L);
    lua_next(L, -2);
    Lua::registerTableToString(L, -1);

    lua_replace(L, -3);
    lua_settop(L, -2);

    return std::string("dom");
}