// A container for random minor tweaks that don't fit anywhere else,
// in order to avoid creating lots of plugins and polluting the namespace.

#include "Core.h"
#include "Console.h"
#include "Export.h"
#include "PluginManager.h"

#include "modules/Gui.h"
#include "modules/Screen.h"
#include "modules/Units.h"
#include "modules/Items.h"

#include "MiscUtils.h"

#include "DataDefs.h"
#include <VTableInterpose.h>
#include "df/ui.h"
#include "df/world.h"
#include "df/squad.h"
#include "df/unit.h"
#include "df/unit_soul.h"
#include "df/historical_entity.h"
#include "df/historical_figure.h"
#include "df/historical_figure_info.h"
#include "df/assumed_identity.h"
#include "df/language_name.h"
#include "df/death_info.h"
#include "df/criminal_case.h"
#include "df/unit_inventory_item.h"
#include "df/viewscreen_dwarfmodest.h"
#include "df/squad_order_trainst.h"
#include "df/ui_build_selector.h"
#include "df/building_trapst.h"
#include "df/item_actual.h"
#include "df/contaminant.h"

#include <stdlib.h>

using std::vector;
using std::string;
using std::endl;
using namespace DFHack;
using namespace df::enums;

using df::global::ui;
using df::global::world;
using df::global::ui_build_selector;
using df::global::ui_menu_width;
using df::global::ui_area_map_width;

using namespace DFHack::Gui;

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

DFHACK_PLUGIN("tweak");

DFhackCExport command_result plugin_init (color_ostream &out, std::vector <PluginCommand> &commands)
{
    commands.push_back(PluginCommand(
        "tweak", "Various tweaks for minor bugs.", tweak, false,
        "  tweak clear-missing\n"
        "    Remove the missing status from the selected unit.\n"
        "  tweak clear-ghostly\n"
        "    Remove the ghostly status from the selected unit.\n"
        "    Intended to fix the case where you can't engrave memorials for ghosts.\n"
        "    Note that this is very dirty and possibly dangerous!\n"
        "    Most probably does not have the positive effect of a proper burial.\n"
        "  tweak fixmigrant\n"
        "    Remove the resident/merchant flag from the selected unit.\n"
        "    Intended to fix bugged migrants/traders who stay at the\n"
        "    map edge and don't enter your fort. Only works for\n"
        "    dwarves (or generally the player's race in modded games).\n"
        "  tweak makeown\n"
        "    Force selected unit to become a member of your fort.\n"
        "    Can be abused to grab caravan merchants and escorts, even if\n"
        "    they don't belong to the player's race. Foreign sentients\n"
        "    (humans, elves) can be put to work, but you can't assign rooms\n"
        "    to them and they don't show up in DwarfTherapist because the\n"
        "    game treats them like pets.\n"
        "  tweak stable-cursor [disable]\n"
        "    Keeps exact position of dwarfmode cursor during exits to main menu.\n"
        "    E.g. allows switching between t/q/k/d without losing position.\n"
        "  tweak patrol-duty [disable]\n"
        "    Causes 'Train' orders to no longer be considered 'patrol duty' so\n"
        "    soldiers will stop getting unhappy thoughts. Does NOT fix the problem\n"
        "    when soldiers go off-duty (i.e. civilian).\n"
        "  tweak readable-build-plate [disable]\n"
        "    Fixes rendering of creature weight limits in pressure plate build menu.\n"
        "  tweak stable-temp [disable]\n"
        "    Fixes performance bug 6012 by squashing jitter in temperature updates.\n"
    ));
    return CR_OK;
}

DFhackCExport command_result plugin_shutdown (color_ostream &out)
{
    return CR_OK;
}

// to be called by tweak-fixmigrant
// units forced into the fort by removing the flags do not own their clothes
// which has the result that they drop all their clothes and become unhappy because they are naked
// so we need to make them own their clothes and add them to their uniform
command_result fix_clothing_ownership(color_ostream &out, df::unit* unit)
{
    // first, find one owned item to initialize the vtable
    bool vt_initialized = false;
    size_t numItems = world->items.all.size();
    for(size_t i=0; i< numItems; i++)
    {
        df::item * item = world->items.all[i];
        if(Items::getOwner(item))
        {
            vt_initialized = true;
            break;
        }
    }
    if(!vt_initialized)
    {
        out << "fix_clothing_ownership: could not initialize vtable!" << endl;
        return CR_FAILURE;
    }

    int fixcount = 0;
    for(size_t j=0; j<unit->inventory.size(); j++)
    {
        df::unit_inventory_item* inv_item = unit->inventory[j];
        df::item* item = inv_item->item;
        // unforbid items (for the case of kidnapping caravan escorts who have their stuff forbidden by default)
        inv_item->item->flags.bits.forbid = 0;
        if(inv_item->mode == df::unit_inventory_item::T_mode::Worn)
        {
            // ignore armor?
            // it could be leather boots, for example, in which case it would not be nice to forbid ownership
            //if(item->getEffectiveArmorLevel() != 0)
            //    continue;

            if(!Items::getOwner(item))
            {
                if(Items::setOwner(item, unit))
                {
                    // add to uniform, so they know they should wear their clothes
                    insert_into_vector(unit->military.uniforms[0], item->id);
                    fixcount++;
                }
                else
                    out << "could not change ownership for item!" << endl;
            }
        }
    }
    // clear uniform_drop (without this they would drop their clothes and pick them up some time later)
    unit->military.uniform_drop.clear();
    out << "ownership for " << fixcount << " clothes fixed" << endl;
    return CR_OK;
}

/*
 * Save or restore cursor position on change to/from main dwarfmode menu.
 */

static df::coord last_view, last_cursor;

struct stable_cursor_hook : df::viewscreen_dwarfmodest
{
    typedef df::viewscreen_dwarfmodest interpose_base;

    DEFINE_VMETHOD_INTERPOSE(void, feed, (set<df::interface_key> *input))
    {
        bool was_default = (ui->main.mode == df::ui_sidebar_mode::Default);
        df::coord view = Gui::getViewportPos();
        df::coord cursor = Gui::getCursorPos();

        INTERPOSE_NEXT(feed)(input);

        bool is_default = (ui->main.mode == df::ui_sidebar_mode::Default);
        df::coord cur_cursor = Gui::getCursorPos();

        if (is_default && !was_default)
        {
            last_view = view; last_cursor = cursor;
        }
        else if (!is_default && was_default &&
                 Gui::getViewportPos() == last_view &&
                 last_cursor.isValid() && cur_cursor.isValid())
        {
            Gui::setCursorCoords(last_cursor.x, last_cursor.y, last_cursor.z);

            // Force update of ui state
            set<df::interface_key> tmp;
            tmp.insert(interface_key::CURSOR_DOWN_Z);
            INTERPOSE_NEXT(feed)(&tmp);
            tmp.clear();
            tmp.insert(interface_key::CURSOR_UP_Z);
            INTERPOSE_NEXT(feed)(&tmp);
        }
        else if (cur_cursor.isValid())
        {
            last_cursor = df::coord();
        }
    }
};

IMPLEMENT_VMETHOD_INTERPOSE(stable_cursor_hook, feed);

struct patrol_duty_hook : df::squad_order_trainst
{
    typedef df::squad_order_trainst interpose_base;

    DEFINE_VMETHOD_INTERPOSE(bool, isPatrol, ())
    {
        return false;
    }
};

IMPLEMENT_VMETHOD_INTERPOSE(patrol_duty_hook, isPatrol);

struct readable_build_plate_hook : df::viewscreen_dwarfmodest
{
    typedef df::viewscreen_dwarfmodest interpose_base;

    DEFINE_VMETHOD_INTERPOSE(void, render, ())
    {
        INTERPOSE_NEXT(render)();

        if (ui->main.mode == ui_sidebar_mode::Build &&
            ui_build_selector->stage == 1 &&
            ui_build_selector->building_type == building_type::Trap &&
            ui_build_selector->building_subtype == trap_type::PressurePlate &&
            ui_build_selector->plate_info.flags.bits.units)
        {
            auto dims = Gui::getDwarfmodeViewDims();
            int x = dims.menu_x1;

            Screen::Pen pen(' ',COLOR_WHITE);

            int minv = ui_build_selector->plate_info.unit_min;
            if ((minv % 1000) == 0)
                Screen::paintString(pen, x+11, 14, stl_sprintf("%3dK ", minv/1000));

            int maxv = ui_build_selector->plate_info.unit_max;
            if (maxv < 200000 && (maxv % 1000) == 0)
                Screen::paintString(pen, x+24, 14, stl_sprintf("%3dK ", maxv/1000));
        }
    }
};

IMPLEMENT_VMETHOD_INTERPOSE(readable_build_plate_hook, render);

struct stable_temp_hook : df::item_actual {
    typedef df::item_actual interpose_base;

    DEFINE_VMETHOD_INTERPOSE(bool, adjustTemperature, (uint16_t temp, int32_t rate_mult))
    {
        if (temperature != temp)
        {
            // Bug 6012 is caused by fixed-point precision mismatch jitter
            // when an item is being pushed by two sources at N and N+1.
            // This check suppresses it altogether.
            if (temp == temperature+1 ||
                (temp == temperature-1 && temperature_fraction == 0))
                temp = temperature;
            // When SPEC_HEAT is NONE, the original function seems to not
            // change the temperature, yet return true, which is silly.
            else if (getSpecHeat() == 60001)
                temp = temperature;
        }

        return INTERPOSE_NEXT(adjustTemperature)(temp, rate_mult);
    }

    DEFINE_VMETHOD_INTERPOSE(bool, updateContaminants, ())
    {
        if (contaminants)
        {
            // Force 1-degree difference in contaminant temperature to 0
            for (size_t i = 0; i < contaminants->size(); i++)
            {
                auto obj = (*contaminants)[i];

                if (abs(obj->temperature - temperature) == 1)
                {
                    obj->temperature = temperature;
                    obj->temperature_fraction = temperature_fraction;
                }
            }
        }

        return INTERPOSE_NEXT(updateContaminants)();
    }
};

IMPLEMENT_VMETHOD_INTERPOSE(stable_temp_hook, adjustTemperature);
IMPLEMENT_VMETHOD_INTERPOSE(stable_temp_hook, updateContaminants);

static void enable_hook(color_ostream &out, VMethodInterposeLinkBase &hook, vector <string> &parameters)
{
    if (vector_get(parameters, 1) == "disable")
    {
        hook.remove();
        out.print("Disabled tweak %s\n", parameters[0].c_str());
    }
    else
    {
        if (hook.apply())
            out.print("Enabled tweak %s\n", parameters[0].c_str());
        else
            out.printerr("Could not activate tweak %s\n", parameters[0].c_str());
    }
}

static command_result tweak(color_ostream &out, vector <string> &parameters)
{
    CoreSuspender suspend;

    if (parameters.empty())
        return CR_WRONG_USAGE;

    string cmd = parameters[0];

    if (cmd == "clear-missing")
    {
        df::unit *unit = getSelectedUnit(out, true);
        if (!unit)
            return CR_FAILURE;

        auto death = df::death_info::find(unit->counters.death_id);

        if (death)
        {
            death->flags.bits.discovered = true;

            auto crime = df::criminal_case::find(death->crime_id);
            if (crime)
                crime->flags.bits.discovered = true;
        }
    }
    else if (cmd == "clear-ghostly")
    {
        df::unit *unit = getSelectedUnit(out, true);
        if (!unit)
            return CR_FAILURE;

        // don't accidentally kill non-ghosts!
        if (unit->flags3.bits.ghostly)
        {
            // remove ghostly, set to dead instead
            unit->flags3.bits.ghostly = 0;
            unit->flags1.bits.dead = 1;
        }
        else
        {
            out.print("That's not a ghost!\n");
            return CR_FAILURE;
        }
    }
    else if (cmd == "fixmigrant")
    {
        df::unit *unit = getSelectedUnit(out, true);
        if (!unit)
            return CR_FAILURE;
        
        if(unit->race != df::global::ui->race_id)
        {
            out << "Selected unit does not belong to your race!" << endl;
            return CR_FAILURE;
        }

        // case #1: migrants who have the resident flag set
        // see http://dffd.wimbli.com/file.php?id=6139 for a save
        if (unit->flags2.bits.resident)
            unit->flags2.bits.resident = 0;
        
        // case #2: migrants who have the merchant flag
        // happens on almost all maps after a few migrant waves
        if(unit->flags1.bits.merchant)
            unit->flags1.bits.merchant = 0;

        // this one is a cheat, but bugged migrants usually have the same civ_id 
        // so it should not be triggered in most cases
        // if it happens that the player has 'foreign' units of the same race 
        // (vanilla df: dwarves not from mountainhome) on his map, just grab them
        if(unit->civ_id != df::global::ui->civ_id)
            unit->civ_id = df::global::ui->civ_id;

        return fix_clothing_ownership(out, unit);
    }
    else if (cmd == "makeown")
    {
        // force a unit into your fort, regardless of civ or race
        // allows to "steal" caravan guards etc
        df::unit *unit = getSelectedUnit(out, true);
        if (!unit)
            return CR_FAILURE;

        if (unit->flags2.bits.resident)
            unit->flags2.bits.resident = 0;
        if(unit->flags1.bits.merchant)
            unit->flags1.bits.merchant = 0;
        if(unit->flags1.bits.forest)
            unit->flags1.bits.forest = 0;
        if(unit->civ_id != df::global::ui->civ_id)
            unit->civ_id = df::global::ui->civ_id;
        if(unit->profession == df::profession::MERCHANT)
            unit->profession = df::profession::TRADER;
        if(unit->profession2 == df::profession::MERCHANT)
            unit->profession2 = df::profession::TRADER;
        return fix_clothing_ownership(out, unit);
    }
    else if (cmd == "stable-cursor")
    {
        enable_hook(out, INTERPOSE_HOOK(stable_cursor_hook, feed), parameters);
    }
    else if (cmd == "patrol-duty")
    {
        enable_hook(out, INTERPOSE_HOOK(patrol_duty_hook, isPatrol), parameters);
    }
    else if (cmd == "readable-build-plate")
    {
        if (!ui_build_selector || !ui_menu_width || !ui_area_map_width)
        {
            out.printerr("Necessary globals not known.\n");
            return CR_FAILURE;
        }

        enable_hook(out, INTERPOSE_HOOK(readable_build_plate_hook, render), parameters);
    }
    else if (cmd == "stable-temp")
    {
        enable_hook(out, INTERPOSE_HOOK(stable_temp_hook, adjustTemperature), parameters);
        enable_hook(out, INTERPOSE_HOOK(stable_temp_hook, updateContaminants), parameters);
    }
    else 
        return CR_WRONG_USAGE;

    return CR_OK;
}