/*
 * Copyright (c) 2010-2013 OTClient <https://github.com/edubart/otclient>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "map.h"
#include "tile.h"
#include "game.h"

#include <framework/core/application.h>
#include <framework/core/eventdispatcher.h>
#include <framework/core/resourcemanager.h>
#include <framework/core/filestream.h>
#include <framework/core/binarytree.h>
#include <framework/xml/tinyxml.h>
#include <framework/ui/uiwidget.h>

void Map::loadOtbm(const std::string& fileName, const UIWidgetPtr& pbar)
{
    FileStreamPtr fin = g_resources.openFile(fileName);
    if(!fin)
        stdext::throw_exception(stdext::format("Unable to load map '%s'", fileName));

    fin->cache();
    if(!g_things.isOtbLoaded())
        stdext::throw_exception("OTB isn't loaded yet to load a map.");

    if(fin->getU32())
            stdext::throw_exception("Unknown file version detected");

    BinaryTreePtr root = fin->getBinaryTree();
    if(root->getU8())
        stdext::throw_exception("could not read root property!");

    uint32 headerVersion = root->getU32();
    if(headerVersion > 3)
        stdext::throw_exception(stdext::format("Unknown OTBM version detected: %u.", headerVersion));

    setWidth(root->getU16());
    setHeight(root->getU16());

    uint32 headerMajorItems = root->getU8();
    if(headerMajorItems > g_things.getOtbMajorVersion()) {
        stdext::throw_exception(stdext::format("This map was saved with different OTB version. read %d what it's supposed to be: %d",
                                               headerMajorItems, g_things.getOtbMajorVersion()));
    }

    root->skip(3);
    uint32 headerMinorItems =  root->getU32();
    if(headerMinorItems > g_things.getOtbMinorVersion()) {
        g_logger.warning(stdext::format("This map needs an updated OTB. read %d what it's supposed to be: %d or less",
                                        headerMinorItems, g_things.getOtbMinorVersion()));
    }

    BinaryTreePtr node = root->getChildren()[0];
    if(node->getU8() != OTBM_MAP_DATA)
        stdext::throw_exception("Could not read root data node");

    while (node->canRead()) {
        uint8 attribute = node->getU8();
        std::string tmp = node->getString();
        switch (attribute) {
        case OTBM_ATTR_DESCRIPTION:
            setDescription(tmp);
            break;
        case OTBM_ATTR_SPAWN_FILE:
            setSpawnFile(fileName.substr(0, fileName.rfind('/') + 1) + tmp);
            break;
        case OTBM_ATTR_HOUSE_FILE:
            setHouseFile(fileName.substr(0, fileName.rfind('/') + 1) + tmp);
            break;
        default:
            stdext::throw_exception(stdext::format("Invalid attribute '%d'", (int)attribute));
        }
    }

    for(const BinaryTreePtr& nodeMapData : node->getChildren()) {
        uint8 mapDataType = nodeMapData->getU8();
        if(mapDataType == OTBM_TILE_AREA) {
            Position basePos = nodeMapData->getPosition();

            for(const BinaryTreePtr &nodeTile : nodeMapData->getChildren()) {
                uint8 type = nodeTile->getU8();
                if(type != OTBM_TILE && type != OTBM_HOUSETILE)
                    stdext::throw_exception(stdext::format("invalid node tile type %d", (int)type));

                HousePtr house = nullptr;
                uint32 flags = TILESTATE_NONE;
                Position pos = basePos + nodeTile->getPoint();

                if(type ==  OTBM_HOUSETILE) {
                    uint32 hId = nodeTile->getU32();
                    TilePtr tile = getOrCreateTile(pos);
                    if(!(house = g_houses.getHouse(hId))) {
                        house = HousePtr(new House(hId));
                        g_houses.addHouse(house);
                    }
                    house->setTile(tile);
                }

                while(nodeTile->canRead()) {
                    uint8 tileAttr = nodeTile->getU8();
                    switch (tileAttr) {
                        case OTBM_ATTR_TILE_FLAGS: {
                            uint32 _flags = nodeTile->getU32();
                            if((_flags & TILESTATE_PROTECTIONZONE) == TILESTATE_PROTECTIONZONE)
                                flags |= TILESTATE_PROTECTIONZONE;
                            else if((_flags & TILESTATE_OPTIONALZONE) == TILESTATE_OPTIONALZONE)
                                flags |= TILESTATE_OPTIONALZONE;
                            else if((_flags & TILESTATE_HARDCOREZONE) == TILESTATE_HARDCOREZONE)
                                flags |= TILESTATE_HARDCOREZONE;

                            if((_flags & TILESTATE_NOLOGOUT) == TILESTATE_NOLOGOUT)
                                flags |= TILESTATE_NOLOGOUT;

                            if((_flags & TILESTATE_REFRESH) == TILESTATE_REFRESH)
                                flags |= TILESTATE_REFRESH;

                            break;
                        }
                        case OTBM_ATTR_ITEM: {
                            addThing(Item::createFromOtb(nodeTile->getU16()), pos);
                            break;
                        }
                        default: {
                            stdext::throw_exception(stdext::format("invalid tile attribute %d at pos %s",
                                                                   (int)tileAttr, stdext::to_string(pos)));
                        }
                    }
                }

                for(const BinaryTreePtr& nodeItem : nodeTile->getChildren()) {
                    if(nodeItem->getU8() != OTBM_ITEM)
                        stdext::throw_exception("invalid item node");

                    ItemPtr item = Item::createFromOtb(nodeItem->getU16());
                    item->unserializeItem(nodeItem);

                    if(item->isContainer()) {
                        for(const BinaryTreePtr& containerItem : nodeItem->getChildren()) {
                            if(containerItem->getU8() != OTBM_ITEM)
                                stdext::throw_exception("invalid container item node");

                            ItemPtr cItem = Item::createFromOtb(containerItem->getU16());
                            cItem->unserializeItem(containerItem);
                            item->addContainerItem(cItem);
                        }
                    }

                    if(house && item->isMoveable()) {
                        g_logger.warning(stdext::format("Moveable item found in house: %d at pos %s - escaping...", item->getId(), stdext::to_string(pos)));
                        item.reset();
                    }

                    addThing(item, pos);
                }

                if(const TilePtr& tile = getTile(pos)) {
                    if(house)
                        tile->setHouseId(house->getId());
                    tile->setFlags((tileflags_t)flags);
                    //if(!(++pbarvalue % 8192) && pbar);
                }
            }
        } else if(mapDataType == OTBM_TOWNS) {
            TownPtr town = nullptr;
            for(const BinaryTreePtr &nodeTown : nodeMapData->getChildren()) {
                if(nodeTown->getU8() != OTBM_TOWN)
                    stdext::throw_exception("invalid town node.");

                uint32 townId = nodeTown->getU32();
                std::string townName = nodeTown->getString();
                Position townCoords = nodeTown->getPosition();
                if(!(town = g_towns.getTown(townId))) {
                    town = TownPtr(new Town(townId, townName, townCoords));
                    g_towns.addTown(town);
                }
            }
        } else if(mapDataType == OTBM_WAYPOINTS && headerVersion > 1) {
            for(const BinaryTreePtr &nodeWaypoint : nodeMapData->getChildren()) {
                if(nodeWaypoint->getU8() != OTBM_WAYPOINT)
                    stdext::throw_exception("invalid waypoint node.");

                std::string name = nodeWaypoint->getString();
                Position waypointPos = nodeWaypoint->getPosition();
                if(waypointPos.isValid() && !name.empty() && m_waypoints.find(waypointPos) == m_waypoints.end())
                    m_waypoints.insert(std::make_pair(waypointPos, name));
            }
        } else
            stdext::throw_exception(stdext::format("Unknown map data node %d", (int)mapDataType));
    }

    fin->close();
}

void Map::saveOtbm(const std::string& fileName, const UIWidgetPtr&/* pbar*/)
{
    FileStreamPtr fin = g_resources.createFile(fileName);
    if(!fin)
        stdext::throw_exception(stdext::format("failed to open file '%s' for write", fileName));

    fin->cache();
    std::string dir;
    if(fileName.find_last_of('/') == std::string::npos)
        dir = g_resources.getWorkDir();
    else
        dir = fileName.substr(0, fileName.find_last_of('/'));

    uint32 version = 0;
    if(g_things.getOtbMajorVersion() < ClientVersion820)
        version = 1;
    else
        version = 2;

    /// Usually when a map has empty house/spawn file it means the map is new.
    /// TODO: Ask the user for a map name instead of those ugly uses of substr
    std::string::size_type sep_pos;
    std::string houseFile = getHouseFile();
    std::string spawnFile = getSpawnFile();
    std::string cpyf;

    if((sep_pos = fileName.rfind('.')) != std::string::npos && stdext::ends_with(fileName, ".otbm"))
        cpyf = fileName.substr(0, sep_pos);

    if(houseFile.empty())
        houseFile = cpyf + "-houses.xml";

    if(spawnFile.empty())
        spawnFile = cpyf + "-spawns.xml";

    /// we only need the filename to save to, the directory should be resolved by the OTBM loader not here
    if((sep_pos = spawnFile.rfind('/')) != std::string::npos)
        spawnFile = spawnFile.substr(sep_pos + 1);

    if((sep_pos = houseFile.rfind('/')) != std::string::npos)
        houseFile = houseFile.substr(sep_pos + 1);

    fin->addU32(0); // file version
    OutputBinaryTreePtr root(new OutputBinaryTree(fin));
    {
        root->addU32(version);

        Size mapSize = getSize();
        root->addU16(mapSize.width());
        root->addU16(mapSize.height());

        root->addU32(g_things.getOtbMajorVersion());
        root->addU32(g_things.getOtbMinorVersion());

        root->startNode(OTBM_MAP_DATA);
        {
            // own description.
            for(const auto& desc : getDescriptions()) {
                root->addU8(OTBM_ATTR_DESCRIPTION);
                root->addString(desc);
            }

            // special one
            root->addU8(OTBM_ATTR_DESCRIPTION);
            root->addString(stdext::format("Saved with %s v%s", g_app.getName(), g_app.getVersion()));

            // spawn file.
            root->addU8(OTBM_ATTR_SPAWN_FILE);
            root->addString(spawnFile);

            // house file.
            if(version > 1) {
                root->addU8(OTBM_ATTR_HOUSE_FILE);
                root->addString(houseFile);
            }

            int px = -1, py = -1, pz =-1;
            bool firstNode = true;

            for(uint8_t z = 0; z <= Otc::MAX_Z; ++z) {
                for(const auto& it : m_tileBlocks[z]) {
                    const TileBlock& block = it.second;
                    for(const TilePtr& tile : block.getTiles()) {
                        if(!tile || tile->isEmpty())
                            continue;

                        const Position& pos = tile->getPosition();
                        if(!pos.isValid())
                            continue;

                        if(pos.x < px || pos.x >= px + 256
                                || pos.y < py || pos.y >= py + 256
                                || pos.z != pz) {
                            if(!firstNode)
                                root->endNode(); /// OTBM_TILE_AREA

                            firstNode = false;
                            root->startNode(OTBM_TILE_AREA);

                            px = pos.x & 0xFF00;
                            py = pos.y & 0xFF00;
                            pz = pos.z;
                            root->addPos(Position(px, py, pz));
                        }

                        root->startNode(tile->isHouseTile() ? OTBM_HOUSETILE : OTBM_TILE);
                        root->addPoint(Point(pos.x, pos.y) & 0xFF);
                        if(tile->isHouseTile())
                            root->addU32(tile->getHouseId());

                        if(tile->getFlags()) {
                            root->addU8(OTBM_ATTR_TILE_FLAGS);
                            root->addU32(tile->getFlags());
                        }

                        const auto& itemList = tile->getItems();
                        const ItemPtr& ground = tile->getGround();
                        if(ground) {
                            // Those types are called "complex" needs other stuff to be written.
                            // For containers, there is container items, for depot, depot it and so on.
                            if(!ground->isContainer() && !ground->isDepot()
                                    && !ground->isDoor() && !ground->isTeleport()) {
                                root->addU8(OTBM_ATTR_ITEM);
                                root->addU16(ground->getServerId());
                            } else
                                ground->serializeItem(root);
                        }
                        for(const ItemPtr& item : itemList)
                            if(!item->isGround())
                                item->serializeItem(root);

                        root->endNode(); // OTBM_TILE
                    }
                }
            }

            if(!firstNode)
                root->endNode();  // OTBM_TILE_AREA

            root->startNode(OTBM_TOWNS);
            for(const TownPtr& town : g_towns.getTowns()) {
                root->addU32(town->getId());
                root->addString(town->getName());
                root->addPos(town->getPos());
            }
            root->endNode();

            if(version > 1) {
                root->startNode(OTBM_WAYPOINTS);
                for(const auto& it : m_waypoints) {
                    root->addString(it.second);
                    root->addPos(it.first);
                }
                root->endNode();
            }
        }
        root->endNode(); // OTBM_MAP_DATA
    }
    root->endNode();

    fin->flush();
    fin->close();
}

bool Map::loadOtcm(const std::string& fileName)
{
    try {
        FileStreamPtr fin = g_resources.openFile(fileName);
        if(!fin)
            stdext::throw_exception("unable to open file");

        fin->cache();

        uint32 signature = fin->getU32();
        if(signature != OTCM_SIGNATURE)
            stdext::throw_exception("invalid otcm file");

        uint16 start = fin->getU16();
        uint16 version = fin->getU16();
        fin->getU32(); // flags

        switch(version) {
            case 1: {
                fin->getString(); // description
                uint32 datSignature = fin->getU32();
                fin->getU16(); // protocol version
                fin->getString(); // world name

                if(datSignature != g_things.getDatSignature())
                    g_logger.warning("otcm map loaded was created with a different dat signature");

                break;
            }
            default:
                stdext::throw_exception("otcm version not supported");
        }

        fin->seek(start);

        while(true) {
            Position pos;

            pos.x = fin->getU16();
            pos.y = fin->getU16();
            pos.z = fin->getU8();

            // end of file
            if(!pos.isValid())
                break;

            const TilePtr& tile = g_map.createTile(pos);

            int stackPos = 0;
            while(true) {
                int id = fin->getU16();

                // end of tile
                if(id == 0xFFFF)
                    break;

                int countOrSubType = fin->getU8();

                ItemPtr item = Item::create(id);
                item->setCountOrSubType(countOrSubType);

                if(item->isValid())
                    tile->addThing(item, stackPos++);
            }

            g_map.notificateTileUpdate(pos);
        }

        fin->close();

        return true;
    } catch(stdext::exception& e) {
        g_logger.error(stdext::format("failed to load OTCM map: %s", e.what()));
        return false;
    }
}

void Map::saveOtcm(const std::string& fileName)
{
    try {
        stdext::timer saveTimer;

        FileStreamPtr fin = g_resources.createFile(fileName);
        fin->cache();

        //TODO: compression flag with zlib
        uint32 flags = 0;

        // header
        fin->addU32(OTCM_SIGNATURE);
        fin->addU16(0); // data start, will be overwritten later
        fin->addU16(OTCM_VERSION);
        fin->addU32(flags);

        // version 1 header
        fin->addString("OTCM 1.0"); // map description
        fin->addU32(g_things.getDatSignature());
        fin->addU16(g_game.getProtocolVersion());
        fin->addString(g_game.getWorldName());

        // go back and rewrite where the map data starts
        uint32 start = fin->tell();
        fin->seek(4);
        fin->addU16(start);
        fin->seek(start);

        for(uint8_t z = 0; z <= Otc::MAX_Z; ++z) {
            for(const auto& it : m_tileBlocks[z]) {
                const TileBlock& block = it.second;
                for(const TilePtr& tile : block.getTiles()) {
                    if(!tile || tile->isEmpty())
                        continue;

                    Position pos = tile->getPosition();
                    fin->addU16(pos.x);
                    fin->addU16(pos.y);
                    fin->addU8(pos.z);

                    for(const ThingPtr& thing : tile->getThings()) {
                        if(thing->isItem()) {
                            ItemPtr item = thing->static_self_cast<Item>();
                            fin->addU16(item->getId());
                            fin->addU8(item->getCountOrSubType());
                        }
                    }

                    // end of tile
                    fin->addU16(0xFFFF);
                }
            }
        }

        // end of file
        Position invalidPos;
        fin->addU16(invalidPos.x);
        fin->addU16(invalidPos.y);
        fin->addU8(invalidPos.z);

        fin->flush();

        fin->close();
    } catch(stdext::exception& e) {
        g_logger.error(stdext::format("failed to save OTCM map: %s", e.what()));
    }
}
