#include <iostream>
#include <vector>
#include <stack>
#include <map>
#include <set>
#include <cstdlib>
#include <sstream>
using std::vector;
using std::string;
using std::endl;
using std::set;

#include "Core.h"
#include "Console.h"
#include "Export.h"
#include "PluginManager.h"
#include "modules/Vegetation.h"
#include "modules/Maps.h"
#include "modules/Gui.h"
#include "TileTypes.h"
#include "modules/MapCache.h"
using namespace MapExtras;
using namespace DFHack;
using namespace df::enums;
typedef vector <df::coord> coord_vec;

CommandHistory liquids_hist;

command_result df_liquids (color_ostream &out, vector <string> & parameters);

DFHACK_PLUGIN("liquids");

DFhackCExport command_result plugin_init ( color_ostream &out, std::vector <PluginCommand> &commands)
{
    liquids_hist.load("liquids.history");
    commands.clear();
    commands.push_back(PluginCommand("liquids", "Place magma, water or obsidian.", df_liquids, true));
    return CR_OK;
}

DFhackCExport command_result plugin_shutdown ( color_ostream &out )
{
    liquids_hist.save("liquids.history");
    return CR_OK;
}

class Brush
{
public:
    virtual ~Brush(){};
    virtual coord_vec points(MapCache & mc,DFHack::DFCoord start) = 0;
};
/**
 * generic 3D rectangle brush. you can specify the dimensions of
 * the rectangle and optionally which tile is its 'center'
 */
class RectangleBrush : public Brush
{
public:
    RectangleBrush(int x, int y, int z = 1, int centerx = -1, int centery = -1, int centerz = -1)
    {
        if(centerx == -1)
            cx_ = x/2;
        else
            cx_ = centerx;
        if(centery == -1)
            cy_ = y/2;
        else
            cy_ = centery;
        if(centerz == -1)
            cz_ = z/2;
        else
            cz_ = centerz;
        x_ = x;
        y_ = y;
        z_ = z;
    };
    coord_vec points(MapCache & mc, DFHack::DFCoord start)
    {
        coord_vec v;
        DFHack::DFCoord iterstart(start.x - cx_, start.y - cy_, start.z - cz_);
        DFHack::DFCoord iter = iterstart;
        for(int xi = 0; xi < x_; xi++)
        {
            for(int yi = 0; yi < y_; yi++)
            {
                for(int zi = 0; zi < z_; zi++)
                {
                    if(mc.testCoord(iter))
                        v.push_back(iter);
                    iter.z++;
                }
                iter.z = iterstart.z;
                iter.y++;
            }
            iter.y = iterstart.y;
            iter.x ++;
        }
        return v;
    };
    ~RectangleBrush(){};
private:
    int x_, y_, z_;
    int cx_, cy_, cz_;
};

/**
 * stupid block brush, legacy. use when you want to apply something to a whole DF map block.
 */
class BlockBrush : public Brush
{
public:
    BlockBrush(){};
    ~BlockBrush(){};
    coord_vec points(MapCache & mc, DFHack::DFCoord start)
    {
        coord_vec v;
        DFHack::DFCoord blockc = start / 16;
        DFHack::DFCoord iterc = blockc * 16;
        if( !mc.testCoord(start) )
            return v;
        auto starty = iterc.y;
        for(int xi = 0; xi < 16; xi++)
        {
            for(int yi = 0; yi < 16; yi++)
            {
                v.push_back(iterc);
                iterc.y++;
            }
            iterc.y = starty;
            iterc.x ++;
        }
        return v;
    };
};

/**
 * Column from a position through open space tiles
 * example: create a column of magma
 */
class ColumnBrush : public Brush
{
public:
    ColumnBrush(){};
    ~ColumnBrush(){};
    coord_vec points(MapCache & mc, DFHack::DFCoord start)
    {
        coord_vec v;
        bool juststarted = true;
        while (mc.testCoord(start))
        {
            df::tiletype tt = mc.tiletypeAt(start);
            if(DFHack::LowPassable(tt) || juststarted && DFHack::HighPassable(tt))
            {
                v.push_back(start);
                juststarted = false;
                start.z++;
            }
            else break;
        }
        return v;
    };
};

/**
 * Flood-fill water tiles from cursor (for wclean)
 * example: remove salt flag from a river
 */
class FloodBrush : public Brush
{
public:
    FloodBrush(Core *c){c_ = c;};
    ~FloodBrush(){};
    coord_vec points(MapCache & mc, DFHack::DFCoord start)
    {
        coord_vec v;

		std::stack<DFCoord> to_flood;
	    to_flood.push(start);

		std::set<DFCoord> seen;

		while (!to_flood.empty()) {
			DFCoord xy = to_flood.top();
			to_flood.pop();

                        df::tile_designation des = mc.designationAt(xy);

			if (seen.find(xy) == seen.end() 
                            && des.bits.flow_size
                            && des.bits.liquid_type == tile_liquid::Water) {
				v.push_back(xy);
				seen.insert(xy);

				maybeFlood(DFCoord(xy.x - 1, xy.y, xy.z), to_flood, mc);
				maybeFlood(DFCoord(xy.x + 1, xy.y, xy.z), to_flood, mc);
				maybeFlood(DFCoord(xy.x, xy.y - 1, xy.z), to_flood, mc);
				maybeFlood(DFCoord(xy.x, xy.y + 1, xy.z), to_flood, mc);

				df::tiletype tt = mc.tiletypeAt(xy);
				if (LowPassable(tt))
				{
					maybeFlood(DFCoord(xy.x, xy.y, xy.z - 1), to_flood, mc);
				}
				if (HighPassable(tt))
				{
					maybeFlood(DFCoord(xy.x, xy.y, xy.z + 1), to_flood, mc);
				}
			}
		}

		return v;
	}
private:
	void maybeFlood(DFCoord c, std::stack<DFCoord> &to_flood, MapCache &mc) {
		if (mc.testCoord(c)) {
			to_flood.push(c);
		}
	}
	Core *c_;
};

command_result df_liquids (color_ostream &out_, vector <string> & parameters)
{
    int32_t x,y,z;

    assert(out_.is_console());
    Console &out = static_cast<Console&>(out_);

    for(size_t i = 0; i < parameters.size();i++)
    {
        if(parameters[i] == "help" || parameters[i] == "?")
        {
            out.print("This tool allows placing magma, water and other similar things.\n"
            "It is interactive and further help is available when you run it.\n"
            );
            return CR_OK;
        }
    }

    if (!Maps::IsValid())
    {
        out.printerr("Map is not available!\n");
        return CR_FAILURE;
    }

    Brush * brush = new RectangleBrush(1,1);
    string brushname = "point";
    bool end = false;
    out << "Welcome to the liquid spawner.\nType 'help' or '?' for a list of available commands, 'q' to quit.\nPress return after a command to confirm." << std::endl;
    string mode="magma";

    string flowmode="f+";
    string setmode ="s.";
    unsigned int amount = 7;
    int width = 1, height = 1, z_levels = 1;
    while(!end)
    {
        string command = "";
        std::stringstream str;
        str <<"[" << mode << ":" << brushname << ":" << amount << ":" << flowmode << ":" << setmode << "]#";
        if(out.lineedit(str.str(),command,liquids_hist) == -1)
            return CR_FAILURE;
        if(command=="help" || command == "?")
        {
            out << "Modes:" << endl
                 << "m             - switch to magma" << endl
                 << "w             - switch to water" << endl
                 << "o             - make obsidian wall instead" << endl
                 << "of            - make obsidian floors" << endl
                 << "rs            - make a river source" << endl
                 << "f             - flow bits only" << endl
                 << "wclean        - remove salt and stagnant flags from tiles" << endl
                 << "Set-Modes (only for magma/water):" << endl
                 << "s+            - only add" << endl
                 << "s.            - set" << endl
                 << "s-            - only remove" << endl
                 << "Properties (only for magma/water):" << endl
                 << "f+            - make the spawned liquid flow" << endl
                 << "f.            - don't change flow state (read state in flow mode)" << endl
                 << "f-            - make the spawned liquid static" << endl
                 << "0-7           - set liquid amount" << endl
                 << "Brush:" << endl
                 << "point         - single tile [p]" << endl
                 << "range         - block with cursor at bottom north-west [r]" << endl
                 << "                (any place, any size)" << endl
                 << "block         - DF map block with cursor in it" << endl
                 << "                (regular spaced 16x16x1 blocks)" << endl
                 << "column        - Column from cursor, up through free space" << endl
                 << "flood         - Flood-fill water tiles from cursor" << endl
                 << "                (only makes sense with wclean)" << endl
                 << "Other:" << endl
                 << "q             - quit" << endl
                 << "help or ?     - print this list of commands" << endl
                 << "empty line    - put liquid" << endl
                 << endl
                 << "Usage: point the DF cursor at a tile you want to modify" << endl
                 << "and use the commands available :)" << endl;
        }
        else if(command == "m")
        {
            mode = "magma";
        }
        else if(command == "o")
        {
            mode = "obsidian";
        }
        else if(command == "of")
        {
            mode = "obsidian_floor";
        }
        else if(command == "w")
        {
            mode = "water";
        }
        else if(command == "f")
        {
            mode = "flowbits";
        }
        else if(command == "rs")
        {
            mode = "riversource";
        }
        else if(command == "wclean")
        {
            mode = "wclean";
        }
        else if(command == "point" || command == "p")
        {
            delete brush;
            brushname = "point";
            brush = new RectangleBrush(1,1);
        }
        else if(command == "range" || command == "r")
        {
            std::stringstream str;
            CommandHistory range_hist;
            str << " :set range width<" << width << "># ";
            out.lineedit(str.str(),command,range_hist);
            range_hist.add(command);
            width = command == "" ? width : atoi (command.c_str());
            if(width < 1) width = 1;

            str.str("");
            str << " :set range height<" << height << "># ";
            out.lineedit(str.str(),command,range_hist);
            range_hist.add(command);
            height = command == "" ? height : atoi (command.c_str());
            if(height < 1) height = 1;

            str.str("");
            str << " :set range z-levels<" << z_levels << "># ";
            out.lineedit(str.str(),command,range_hist);
            range_hist.add(command);
            z_levels = command == "" ? z_levels : atoi (command.c_str());
            if(z_levels < 1) z_levels = 1;
            delete brush;
            if(width == 1 && height == 1 && z_levels == 1)
            {
                brushname="point";
            }
            else
            {
                brushname = "range";
            }
            brush = new RectangleBrush(width,height,z_levels,0,0,0);
        }
        else if(command == "block")
        {
            delete brush;
            brushname = "block";
            brush = new BlockBrush();
        }
        else if(command == "column")
        {
            delete brush;
            brushname = "column";
            brush = new ColumnBrush();
        }
		else if(command == "flood")
		{
			delete brush;
			brushname = "flood";
			brush = new FloodBrush(&Core::getInstance());
		}
        else if(command == "q")
        {
            end = true;
        }
        else if(command == "f+")
        {
            flowmode = "f+";
        }
        else if(command == "f-")
        {
            flowmode = "f-";
        }
        else if(command == "f.")
        {
            flowmode = "f.";
        }
        else if(command == "s+")
        {
            setmode = "s+";
        }
        else if(command == "s-")
        {
            setmode = "s-";
        }
        else if(command == "s.")
        {
            setmode = "s.";
        }
        // blah blah, bad code, bite me.
        else if(command == "0")
            amount = 0;
        else if(command == "1")
            amount = 1;
        else if(command == "2")
            amount = 2;
        else if(command == "3")
            amount = 3;
        else if(command == "4")
            amount = 4;
        else if(command == "5")
            amount = 5;
        else if(command == "6")
            amount = 6;
        else if(command == "7")
            amount = 7;
        else if(command.empty())
        {
            CoreSuspender suspend;

            do
            {
                if (!Maps::IsValid())
                {
                    out << "Can't see any DF map loaded." << endl;
                    break;;
                }
                if(!Gui::getCursorCoords(x,y,z))
                {
                    out << "Can't get cursor coords! Make sure you have a cursor active in DF." << endl;
                    break;
                }
                out << "cursor coords: " << x << "/" << y << "/" << z << endl;
                MapCache mcache;
                DFHack::DFCoord cursor(x,y,z);
                coord_vec all_tiles = brush->points(mcache,cursor);
                out << "working..." << endl;
                if(mode == "obsidian")
                {
                    coord_vec::iterator iter = all_tiles.begin();
                    while (iter != all_tiles.end())
                    {
                        mcache.setTiletypeAt(*iter, tiletype::LavaWall);
                        mcache.setTemp1At(*iter,10015);
                        mcache.setTemp2At(*iter,10015);
                        df::tile_designation des = mcache.designationAt(*iter);
                        des.bits.flow_size = 0;
                        mcache.setDesignationAt(*iter, des);
                        iter ++;
                    }
                }
                if(mode == "obsidian_floor")
                {
                    coord_vec::iterator iter = all_tiles.begin();
                    while (iter != all_tiles.end())
                    {
                        mcache.setTiletypeAt(*iter, findRandomVariant(tiletype::LavaFloor1));
                        iter ++;
                    }
                }
                else if(mode == "riversource")
                {
                    coord_vec::iterator iter = all_tiles.begin();
                    while (iter != all_tiles.end())
                    {
                        mcache.setTiletypeAt(*iter, tiletype::RiverSource);

                        df::tile_designation a = mcache.designationAt(*iter);
                        a.bits.liquid_type = tile_liquid::Water;
                        a.bits.liquid_static = false;
                        a.bits.flow_size = 7;
                        mcache.setTemp1At(*iter,10015);
                        mcache.setTemp2At(*iter,10015);
                        mcache.setDesignationAt(*iter,a);

                        Block * b = mcache.BlockAt((*iter)/16);
                        DFHack::t_blockflags bf = b->BlockFlags();
                        bf.bits.liquid_1 = true;
                        bf.bits.liquid_2 = true;
                        b->setBlockFlags(bf);

                        iter++;
                    }
                }
                else if(mode=="wclean")
                {
                    coord_vec::iterator iter = all_tiles.begin();
                    while (iter != all_tiles.end())
                    {
                        DFHack::DFCoord current = *iter;
                        df::tile_designation des = mcache.designationAt(current);
                        des.bits.water_salt = false;
                        des.bits.water_stagnant = false;
                        mcache.setDesignationAt(current,des);
                        iter++;
                    }
                }
                else if(mode== "magma" || mode== "water" || mode == "flowbits")
                {
                    set <Block *> seen_blocks;
                    coord_vec::iterator iter = all_tiles.begin();
                    while (iter != all_tiles.end())
                    {
                        DFHack::DFCoord current = *iter; // current tile coord
                        DFHack::DFCoord curblock = current /16; // current block coord
                        // check if the block is actually there
                        if(!mcache.BlockAt(curblock))
                        {
                            iter ++;
                            continue;
                        }
                        df::tile_designation des = mcache.designationAt(current);
                        df::tiletype tt = mcache.tiletypeAt(current);
                        // don't put liquids into places where they don't belong...
                        if(!DFHack::FlowPassable(tt))
                        {
                            iter++;
                            continue;
                        }
                        if(mode != "flowbits")
                        {
                            if(setmode == "s.")
                            {
                                des.bits.flow_size = amount;
                            }
                            else if(setmode == "s+")
                            {
                                if(des.bits.flow_size < amount)
                                    des.bits.flow_size = amount;
                            }
                            else if(setmode == "s-")
                            {
                                if (des.bits.flow_size > amount)
                                    des.bits.flow_size = amount;
                            }
                            if(amount != 0 && mode == "magma")
                            {
                                des.bits.liquid_type =  tile_liquid::Magma;
                                mcache.setTemp1At(current,12000);
                                mcache.setTemp2At(current,12000);
                            }
                            else if(amount != 0 && mode == "water")
                            {
                                des.bits.liquid_type =  tile_liquid::Water;
                                mcache.setTemp1At(current,10015);
                                mcache.setTemp2At(current,10015);
                            }
                            else if(amount == 0 && (mode == "water" || mode == "magma"))
                            {
                                // reset temperature to sane default
                                mcache.setTemp1At(current,10015);
                                mcache.setTemp2At(current,10015);
                            }
                            mcache.setDesignationAt(current,des);
                        }
                        seen_blocks.insert(mcache.BlockAt(current / 16));
                        iter++;
                    }
                    set <Block *>::iterator biter = seen_blocks.begin();
                    while (biter != seen_blocks.end())
                    {
                        DFHack::t_blockflags bflags = (*biter)->BlockFlags();
                        if(flowmode == "f+")
                        {
                            bflags.bits.liquid_1 = true;
                            bflags.bits.liquid_2 = true;
                            (*biter)->setBlockFlags(bflags);
                        }
                        else if(flowmode == "f-")
                        {
                            bflags.bits.liquid_1 = false;
                            bflags.bits.liquid_2 = false;
                            (*biter)->setBlockFlags(bflags);
                        }
                        else
                        {
                            out << "flow bit 1 = " << bflags.bits.liquid_1 << endl; 
                            out << "flow bit 2 = " << bflags.bits.liquid_2 << endl;
                        }
                        biter ++;
                    }
                }
                if(mcache.WriteAll())
                    out << "OK" << endl;
                else
                    out << "Something failed horribly! RUN!" << endl;
            } while (0);
        }
        else
        {
            out << command << " : unknown command." << endl;
        }
    }
    
    //cleanup
    delete brush;

    return CR_OK;
}