#include "Core.h"
#include "Console.h"
#include "modules/Buildings.h"
#include "modules/Constructions.h"
#include "modules/EventManager.h"
#include "modules/Once.h"
#include "modules/Job.h"
#include "modules/World.h"

#include "df/building.h"
#include "df/construction.h"
#include "df/general_ref.h"
#include "df/general_ref_type.h"
#include "df/general_ref_unit_workerst.h"
#include "df/global_objects.h"
#include "df/item.h"
#include "df/job.h"
#include "df/job_list_link.h"
#include "df/ui.h"
#include "df/unit.h"
#include "df/unit_flags1.h"
#include "df/unit_inventory_item.h"
#include "df/unit_syndrome.h"
#include "df/world.h"

#include <map>
#include <unordered_map>
#include <unordered_set>

using namespace std;
using namespace DFHack;
using namespace EventManager;

/*
 * TODO:
 *  error checking
 *  consider a typedef instead of a struct for EventHandler
 **/

static multimap<int32_t, EventHandler> tickQueue;

//TODO: consider unordered_map of pairs, or unordered_map of unordered_set, or whatever
static multimap<Plugin*, EventHandler> handlers[EventType::EVENT_MAX];
static int32_t eventLastTick[EventType::EVENT_MAX];

static const int32_t ticksPerYear = 403200;

void DFHack::EventManager::registerListener(EventType::EventType e, EventHandler handler, Plugin* plugin) {
    handlers[e].insert(pair<Plugin*, EventHandler>(plugin, handler));
}

void DFHack::EventManager::registerTick(EventHandler handler, int32_t when, Plugin* plugin, bool absolute) {
    if ( !absolute ) {
        df::world* world = df::global::world;
        if ( world ) {
            when += world->frame_counter;
        } else {
            if ( Once::doOnce("EventManager registerTick unhonored absolute=false") )
                Core::getInstance().getConsole().print("EventManager::registerTick: warning! absolute flag=false not honored.\n");
        }
    }
    handler.freq = when;
    tickQueue.insert(pair<int32_t, EventHandler>(handler.freq, handler));
    handlers[EventType::TICK].insert(pair<Plugin*,EventHandler>(plugin,handler));
}

void DFHack::EventManager::unregister(EventType::EventType e, EventHandler handler, Plugin* plugin) {
    for ( multimap<Plugin*, EventHandler>::iterator i = handlers[e].find(plugin); i != handlers[e].end(); i++ ) {
        if ( (*i).first != plugin )
            break;
        EventHandler handle = (*i).second;
        if ( handle == handler ) {
            handlers[e].erase(i);
            break;
        }
    }
    return;
}

void DFHack::EventManager::unregisterAll(Plugin* plugin) {
    for ( auto i = handlers[EventType::TICK].find(plugin); i != handlers[EventType::TICK].end(); i++ ) {
        if ( (*i).first != plugin )
            break;
        
        //shenanigans to avoid concurrent modification
        EventHandler getRidOf = (*i).second;
        bool didSomething;
        do {
            didSomething = false;
            for ( auto j = tickQueue.find(getRidOf.freq); j != tickQueue.end(); j++ ) {
                if ( (*j).first > getRidOf.freq )
                    break;
                if ( (*j).second != getRidOf )
                    continue;
                tickQueue.erase(j);
                didSomething = true;
                break;
            }
        } while (didSomething); //this loop is here in case the same EventHandler was added more than once
    }
    for ( size_t a = 0; a < (size_t)EventType::EVENT_MAX; a++ ) {
        handlers[a].erase(plugin);
    }
    return;
}

static void manageTickEvent(color_ostream& out);
static void manageJobInitiatedEvent(color_ostream& out);
static void manageJobCompletedEvent(color_ostream& out);
static void manageUnitDeathEvent(color_ostream& out);
static void manageItemCreationEvent(color_ostream& out);
static void manageBuildingEvent(color_ostream& out);
static void manageConstructionEvent(color_ostream& out);
static void manageSyndromeEvent(color_ostream& out);
static void manageInvasionEvent(color_ostream& out);
//static void manageEquipmentEvent(color_ostream& out);

typedef void (*eventManager_t)(color_ostream&);

static const eventManager_t eventManager[] = {
    manageTickEvent,
    manageJobInitiatedEvent,
    manageJobCompletedEvent,
    manageUnitDeathEvent,
    manageItemCreationEvent,
    manageBuildingEvent,
    manageConstructionEvent,
    manageSyndromeEvent,
    manageInvasionEvent,
//    manageEquipmentEvent,
};

//job initiated
static int32_t lastJobId = -1;

//job completed
static unordered_map<int32_t, df::job*> prevJobs;

//unit death
static unordered_set<int32_t> livingUnits;

//item creation
static int32_t nextItem;

//building
static int32_t nextBuilding;
static unordered_set<int32_t> buildings;

//construction
static unordered_map<df::coord, df::construction> constructions;
static bool gameLoaded;

//syndrome
static int32_t lastSyndromeTime;

//invasion
static int32_t nextInvasion;

//equipment change
//static unordered_map<int32_t, vector<df::unit_inventory_item> > equipmentLog;

void DFHack::EventManager::onStateChange(color_ostream& out, state_change_event event) {
    static bool doOnce = false;
//    const string eventNames[] = {"world loaded", "world unloaded", "map loaded", "map unloaded", "viewscreen changed", "core initialized", "begin unload", "paused", "unpaused"};
//    out.print("%s,%d: onStateChange %d: \"%s\"\n", __FILE__, __LINE__, (int32_t)event, eventNames[event].c_str());
    if ( !doOnce ) {
        //TODO: put this somewhere else
        doOnce = true;
        EventHandler buildingHandler(Buildings::updateBuildings, 100);
        DFHack::EventManager::registerListener(EventType::BUILDING, buildingHandler, NULL);
        //out.print("Registered listeners.\n %d", __LINE__);
    }
    if ( event == DFHack::SC_MAP_UNLOADED ) {
        lastJobId = -1;
        for ( auto i = prevJobs.begin(); i != prevJobs.end(); i++ ) {
            Job::deleteJobStruct((*i).second, true);
        }
        prevJobs.clear();
        tickQueue.clear();
        livingUnits.clear();
        buildings.clear();
        constructions.clear();

        Buildings::clearBuildings(out);
        gameLoaded = false;
//        equipmentLog.clear();
    } else if ( event == DFHack::SC_MAP_LOADED ) {
        int32_t tick = df::global::world->frame_counter;
        multimap<int32_t,EventHandler> newTickQueue;
        for ( auto i = tickQueue.begin(); i != tickQueue.end(); i++ )
            newTickQueue.insert(pair<int32_t,EventHandler>(tick+(*i).first, (*i).second));
        tickQueue.clear();
        tickQueue.insert(newTickQueue.begin(), newTickQueue.end());
        //out.print("%s,%d: on load, frame_counter = %d\n", __FILE__, __LINE__, tick);

        nextItem = *df::global::item_next_id;
        nextBuilding = *df::global::building_next_id;
        nextInvasion = df::global::ui->invasions.next_id;
        lastJobId = -1 + *df::global::job_next_id;
        
        constructions.clear();
        for ( auto i = df::global::world->constructions.begin(); i != df::global::world->constructions.end(); i++ ) {
            df::construction* constr = *i;
            if ( !constr ) {
                if ( Once::doOnce("EventManager.onLoad null constr") ) {
                    out.print("EventManager.onLoad: null construction.\n");
                }
                continue;
            }
            if ( constr->pos == df::coord() ) {
                if ( Once::doOnce("EventManager.onLoad null position of construction.\n") )
                    out.print("EventManager.onLoad null position of construction.\n");
                continue;
            }
            constructions[constr->pos] = *constr;
        }
        for ( size_t a = 0; a < df::global::world->buildings.all.size(); a++ ) {
            df::building* b = df::global::world->buildings.all[a];
            Buildings::updateBuildings(out, (void*)b);
            buildings.insert(b->id);
        }
        lastSyndromeTime = -1;
        for ( size_t a = 0; a < df::global::world->units.all.size(); a++ ) {
            df::unit* unit = df::global::world->units.all[a];
            for ( size_t b = 0; b < unit->syndromes.active.size(); b++ ) {
                df::unit_syndrome* syndrome = unit->syndromes.active[b];
                int32_t startTime = syndrome->year*ticksPerYear + syndrome->year_time;
                if ( startTime > lastSyndromeTime )
                    lastSyndromeTime = startTime;
            }
        }
        for ( size_t a = 0; a < EventType::EVENT_MAX; a++ ) {
            eventLastTick[a] = -1;//-1000000;
        }
        
        gameLoaded = true;
    }
}

void DFHack::EventManager::manageEvents(color_ostream& out) {
    if ( !gameLoaded ) {
        return;
    }
    CoreSuspender suspender;
    
    int32_t tick = df::global::world->frame_counter;

    for ( size_t a = 0; a < EventType::EVENT_MAX; a++ ) {
        if ( handlers[a].empty() )
            continue;
        int32_t eventFrequency = 1000000000;
        for ( auto b = handlers[a].begin(); b != handlers[a].end(); b++ ) {
            EventHandler bob = (*b).second;
            if ( bob.freq < eventFrequency )
                eventFrequency = bob.freq;
        }
        
        if ( tick - eventLastTick[a] < eventFrequency )
            continue;
        
        eventManager[a](out);
        eventLastTick[a] = tick;
    }
}

static void manageTickEvent(color_ostream& out) {
    int32_t tick = df::global::world->frame_counter;
    while ( !tickQueue.empty() ) {
        if ( tick < (*tickQueue.begin()).first )
            break;
        EventHandler handle = (*tickQueue.begin()).second;
        tickQueue.erase(tickQueue.begin());
        handle.eventHandler(out, (void*)tick);
    }
    
}

static void manageJobInitiatedEvent(color_ostream& out) {
    if ( lastJobId == -1 ) {
        lastJobId = *df::global::job_next_id - 1;
        return;
    }

    if ( lastJobId+1 == *df::global::job_next_id ) {
        return; //no new jobs
    }
    multimap<Plugin*,EventHandler> copy(handlers[EventType::JOB_INITIATED].begin(), handlers[EventType::JOB_INITIATED].end());
    
    for ( df::job_list_link* link = &df::global::world->job_list; link != NULL; link = link->next ) {
        if ( link->item == NULL )
            continue;
        if ( link->item->id <= lastJobId )
            continue;
        for ( auto i = copy.begin(); i != copy.end(); i++ ) {
            (*i).second.eventHandler(out, (void*)link->item);
        }
    }

    lastJobId = *df::global::job_next_id - 1;
}

//helper function for manageJobCompletedEvent
static int32_t getWorkerID(df::job* job) {
    for ( size_t a = 0; a < job->general_refs.size(); a++ ) {
        if ( job->general_refs[a]->getType() != df::enums::general_ref_type::UNIT_WORKER )
            continue;
        return ((df::general_ref_unit_workerst*)job->general_refs[a])->unit_id;
    }
    return -1;
}

/*
TODO: consider checking item creation / experience gain just in case
*/
static void manageJobCompletedEvent(color_ostream& out) {
    int32_t tick0 = eventLastTick[EventType::JOB_COMPLETED];
    int32_t tick1 = df::global::world->frame_counter;
    
    multimap<Plugin*,EventHandler> copy(handlers[EventType::JOB_COMPLETED].begin(), handlers[EventType::JOB_COMPLETED].end());
    map<int32_t, df::job*> nowJobs;
    for ( df::job_list_link* link = &df::global::world->job_list; link != NULL; link = link->next ) {
        if ( link->item == NULL )
            continue;
        nowJobs[link->item->id] = link->item;
    }
    
#if 0
    //testing info on job initiation/completion
    //newly allocated jobs
    for ( auto j = nowJobs.begin(); j != nowJobs.end(); j++ ) {
        if ( prevJobs.find((*j).first) != prevJobs.end() )
            continue;
        
        df::job& job1 = *(*j).second;
        out.print("new job\n"
            "  location         : 0x%X\n"
            "  id               : %d\n"
            "  type             : %d %s\n"
            "  working          : %d\n"
            "  completion_timer : %d\n"
            "  workerID         : %d\n"
            "  time             : %d -> %d\n"
            "\n", job1.list_link->item, job1.id, job1.job_type, ENUM_ATTR(job_type, caption, job1.job_type), job1.flags.bits.working, job1.completion_timer, getWorkerID(&job1), tick0, tick1);
    }
    for ( auto i = prevJobs.begin(); i != prevJobs.end(); i++ ) {
        df::job& job0 = *(*i).second;
        auto j = nowJobs.find((*i).first);
        if ( j == nowJobs.end() ) {
            out.print("job deallocated\n"
                "  location         : 0x%X\n"
                "  id               : %d\n"
                "  type             : %d %s\n"
                "  working          : %d\n"
                "  completion_timer : %d\n"
                "  workerID         : %d\n"
                "  time             : %d -> %d\n"
                ,job0.list_link == NULL ? 0 : job0.list_link->item, job0.id, job0.job_type, ENUM_ATTR(job_type, caption, job0.job_type), job0.flags.bits.working, job0.completion_timer, getWorkerID(&job0), tick0, tick1);
            continue;
        }
        df::job& job1 = *(*j).second;
        
        if ( job0.flags.bits.working == job1.flags.bits.working &&
               (job0.completion_timer == job1.completion_timer || (job1.completion_timer > 0 && job0.completion_timer-1 == job1.completion_timer)) &&
               getWorkerID(&job0) == getWorkerID(&job1) )
            continue;
        
        out.print("job change\n"
            "  location         : 0x%X -> 0x%X\n"
            "  id               : %d -> %d\n"
            "  type             : %d -> %d\n"
            "  type             : %s -> %s\n"
            "  working          : %d -> %d\n"
            "  completion timer : %d -> %d\n"
            "  workerID         : %d -> %d\n"
            "  time             : %d -> %d\n"
            "\n",
            job0.list_link->item, job1.list_link->item,
            job0.id, job1.id,
            job0.job_type, job1.job_type,
            ENUM_ATTR(job_type, caption, job0.job_type), ENUM_ATTR(job_type, caption, job1.job_type),
            job0.flags.bits.working, job1.flags.bits.working,
            job0.completion_timer, job1.completion_timer,
            getWorkerID(&job0), getWorkerID(&job1),
            tick0, tick1
        );
    }
#endif
    
    for ( auto i = prevJobs.begin(); i != prevJobs.end(); i++ ) {
        //if it happened within a tick, must have been cancelled by the user or a plugin: not completed
        if ( tick1 <= tick0 )
            continue;
        
        if ( nowJobs.find((*i).first) != nowJobs.end() ) {
            //could have just finished if it's a repeat job
            df::job& job0 = *(*i).second;
            if ( !job0.flags.bits.repeat )
                continue;
            df::job& job1 = *nowJobs[(*i).first];
            if ( job0.completion_timer != 0 )
                continue;
            if ( job1.completion_timer != -1 )
                continue;
            
            //still false positive if cancelled at EXACTLY the right time, but experiments show this doesn't happen
            for ( auto j = copy.begin(); j != copy.end(); j++ ) {
                (*j).second.eventHandler(out, (void*)&job0);
            }
            continue;
        }
        
        //recently finished or cancelled job
        df::job& job0 = *(*i).second;
        if ( job0.flags.bits.repeat || job0.completion_timer != 0 )
            continue;
        
        for ( auto j = copy.begin(); j != copy.end(); j++ ) {
            (*j).second.eventHandler(out, (void*)&job0);
        }
    }

    //erase old jobs, copy over possibly altered jobs
    for ( auto i = prevJobs.begin(); i != prevJobs.end(); i++ ) {
        Job::deleteJobStruct((*i).second, true);
    }
    prevJobs.clear();
    
    //create new jobs
    for ( auto j = nowJobs.begin(); j != nowJobs.end(); j++ ) {
        /*map<int32_t, df::job*>::iterator i = prevJobs.find((*j).first);
        if ( i != prevJobs.end() ) {
            continue;
        }*/

        df::job* newJob = Job::cloneJobStruct((*j).second, true);
        prevJobs[newJob->id] = newJob;
    }
}

static void manageUnitDeathEvent(color_ostream& out) {
    multimap<Plugin*,EventHandler> copy(handlers[EventType::UNIT_DEATH].begin(), handlers[EventType::UNIT_DEATH].end());
    for ( size_t a = 0; a < df::global::world->units.all.size(); a++ ) {
        df::unit* unit = df::global::world->units.all[a];
        //if ( unit->counters.death_id == -1 ) {
        if ( ! unit->flags1.bits.dead ) {
            livingUnits.insert(unit->id);
            continue;
        }
        //dead: if dead since last check, trigger events
        if ( livingUnits.find(unit->id) == livingUnits.end() )
            continue;
        
        for ( auto i = copy.begin(); i != copy.end(); i++ ) {
            (*i).second.eventHandler(out, (void*)unit->id);
        }
        livingUnits.erase(unit->id);
    }
}

static void manageItemCreationEvent(color_ostream& out) {
    if ( nextItem >= *df::global::item_next_id ) {
        return;
    }
    
    multimap<Plugin*,EventHandler> copy(handlers[EventType::ITEM_CREATED].begin(), handlers[EventType::ITEM_CREATED].end());
    size_t index = df::item::binsearch_index(df::global::world->items.all, nextItem, false);
    if ( index != 0 ) index--;
    for ( size_t a = index; a < df::global::world->items.all.size(); a++ ) {
        df::item* item = df::global::world->items.all[a];
        //already processed
        if ( item->id < nextItem )
            continue;
        //invaders
        if ( item->flags.bits.foreign )
            continue;
        //traders who bring back your items?
        if ( item->flags.bits.trader )
            continue;
        //migrants
        if ( item->flags.bits.owned )
            continue;
        //spider webs don't count
        if ( item->flags.bits.spider_web )
            continue;
        for ( auto i = copy.begin(); i != copy.end(); i++ ) {
            (*i).second.eventHandler(out, (void*)item->id);
        }
    }
    nextItem = *df::global::item_next_id;
}

static void manageBuildingEvent(color_ostream& out) {
    /*
     * TODO: could be faster
     * consider looking at jobs: building creation / destruction
     **/
    multimap<Plugin*,EventHandler> copy(handlers[EventType::BUILDING].begin(), handlers[EventType::BUILDING].end());
    //first alert people about new buildings
    for ( int32_t a = nextBuilding; a < *df::global::building_next_id; a++ ) {
        int32_t index = df::building::binsearch_index(df::global::world->buildings.all, a);
        if ( index == -1 ) {
            //out.print("%s, line %d: Couldn't find new building with id %d.\n", __FILE__, __LINE__, a);
            //the tricky thing is that when the game first starts, it's ok to skip buildings, but otherwise, if you skip buildings, something is probably wrong. TODO: make this smarter
            continue;
        }
        buildings.insert(a);
        for ( auto b = copy.begin(); b != copy.end(); b++ ) {
            EventHandler bob = (*b).second;
            bob.eventHandler(out, (void*)a);
        }
    }
    nextBuilding = *df::global::building_next_id;
    
    //now alert people about destroyed buildings
    unordered_set<int32_t> toDelete;
    for ( auto a = buildings.begin(); a != buildings.end(); a++ ) {
        int32_t id = *a;
        int32_t index = df::building::binsearch_index(df::global::world->buildings.all,id);
        if ( index != -1 )
            continue;
        toDelete.insert(id);

        for ( auto b = copy.begin(); b != copy.end(); b++ ) {
            EventHandler bob = (*b).second;
            bob.eventHandler(out, (void*)id);
        }
    }
    
    for ( auto a = toDelete.begin(); a != toDelete.end(); a++ ) {
        int32_t id = *a;
        buildings.erase(id);
    }
    
    //out.print("Sent building event.\n %d", __LINE__);
}

static void manageConstructionEvent(color_ostream& out) {
    //unordered_set<df::construction*> constructionsNow(df::global::world->constructions.begin(), df::global::world->constructions.end());
    
    multimap<Plugin*,EventHandler> copy(handlers[EventType::CONSTRUCTION].begin(), handlers[EventType::CONSTRUCTION].end());
    unordered_set<df::coord> toDelete;
    for ( auto a = constructions.begin(); a != constructions.end(); a++ ) {
        df::construction& construction = (*a).second;
        if ( df::construction::find(construction.pos) != NULL )
            continue;
        //construction removed
        toDelete.insert((*a).first);
        //out.print("Removed construction (%d,%d,%d)\n", construction.pos.x,construction.pos.y,construction.pos.z);
        for ( auto b = copy.begin(); b != copy.end(); b++ ) {
            EventHandler handle = (*b).second;
            handle.eventHandler(out, (void*)&construction);
        }
    }
    
    for ( auto a = toDelete.begin(); a != toDelete.end(); a++ ) {
        constructions.erase(*a);
    }
    
    //for ( auto a = constructionsNow.begin(); a != constructionsNow.end(); a++ ) {
    for ( auto a = df::global::world->constructions.begin(); a != df::global::world->constructions.end(); a++ ) {
        df::construction* construction = *a;
        bool b = constructions.find(construction->pos) != constructions.end();
        constructions[construction->pos] = *construction;
        if ( b )
            continue;
        //construction created
        //out.print("Created construction (%d,%d,%d)\n", construction->pos.x,construction->pos.y,construction->pos.z);
        for ( auto b = copy.begin(); b != copy.end(); b++ ) {
            EventHandler handle = (*b).second;
            handle.eventHandler(out, (void*)construction);
        }
    }
}

static void manageSyndromeEvent(color_ostream& out) {
    multimap<Plugin*,EventHandler> copy(handlers[EventType::SYNDROME].begin(), handlers[EventType::SYNDROME].end());
    int32_t highestTime = -1;
    for ( auto a = df::global::world->units.all.begin(); a != df::global::world->units.all.end(); a++ ) {
        df::unit* unit = *a;
/*
        if ( unit->flags1.bits.dead )
            continue;
*/
        for ( size_t b = 0; b < unit->syndromes.active.size(); b++ ) {
            df::unit_syndrome* syndrome = unit->syndromes.active[b];
            int32_t startTime = syndrome->year*ticksPerYear + syndrome->year_time;
            if ( startTime > highestTime )
                highestTime = startTime;
            if ( startTime <= lastSyndromeTime )
                continue;
            
            SyndromeData data(unit->id, b);
            for ( auto c = copy.begin(); c != copy.end(); c++ ) {
                EventHandler handle = (*c).second;
                handle.eventHandler(out, (void*)&data);
            }
        }
    }
    lastSyndromeTime = highestTime;
}

static void manageInvasionEvent(color_ostream& out) {
    multimap<Plugin*,EventHandler> copy(handlers[EventType::INVASION].begin(), handlers[EventType::INVASION].end());

    if ( df::global::ui->invasions.next_id <= nextInvasion )
        return;
    nextInvasion = df::global::ui->invasions.next_id;

    for ( auto a = copy.begin(); a != copy.end(); a++ ) {
        EventHandler handle = (*a).second;
        handle.eventHandler(out, (void*)nextInvasion);
    }
}

/*
static void manageEquipmentEvent(color_ostream& out) {
    multimap<Plugin*,EventHandler> copy(handlers[EventType::EQUIPMENT_CHANGE].begin(), handlers[EventType::EQUIPMENT_CHANGE].end());
    
    for ( auto a = df::global::world->units.all.begin(); a != df::global::world->units.all.end(); a++ ) {
        df::unit* unit = *a;
        if ( unit->flags1.bits.dead )
            continue;
        
        bool isNew = equipmentLog.find(unit->id) == equipmentLog.end();
        bool needsUpdate = isNew || equipmentLog[unit->id].size() != unit->inventory.size();
        if ( !needsUpdate ) {
            for ( size_t b = 0; b < unit->inventory.size(); b++ ) {
                df::unit_inventory_item* item = unit->inventory[b];
                df::unit_inventory_item& old = equipmentLog[unit->id][b];
                if ( item->item == old.item && item->mode == old.mode && item->body_part_id == old.body_part_id && item->anon_1 == old.anon_1 && item->wound_id == old->wound_id )
                    continue;
                
                needsUpdate = true;
                break;
            }
        }
        
        if ( needsUpdate && !isNew ) {
            for ( auto c = copy.begin(); c != copy.end(); c++ ) {
                EventHandler handle = (*c).second;
                handle.eventHandler(out, (void*)&data);
            }
        }
        
        if ( needsUpdate ) {
            equipmentLog[unit->id].clear();
            for ( size_t b = 0; b < unit->inventory.size(); b++ ) {
                equipmentLog[unit->id].push_back(* unit->inventory[b]);
            }
        }
    }
}
*/