// Smoke tests del sistema d'entitats. Stand-alone, sense frameworks externs.
//
// Tests coberts:
//   T1 factory — tots els tipus es registren i es creen.
//   T2 loader  — llegeix `data/maps/test_entities.yaml` i retorna els spawns.
//   T3 event bus — subscribe + publish + payload (entity*, int).
//   T4 sarcòfag — perímetre computat correctament; notifyTileEntered
//                 passa a OPENING quan es visiten tots els tiles.
//   T5 manager — 2 sarcs + 1 door: forçant l'obertura dels sarcs, la porta
//                s'obri sola; contactar la porta OPEN emet `level_complete`.
//   T6 animation — 3 frames @ 10 fps, `tick(0.15)` → frame índex == 1.
//   T7 plantilles — carrega els 7 YAML d'entitat sense excepcions.
//   T8 decoration — Torch no col·lisiona ni és interactable.
//
// Execució (des de la ruta del repo):
//   make build && cd build && ctest --output-on-failure
// O bé:
//   ./build/test_entities_smoke

#include <cassert>
#include <cstdio>
#include <iostream>
#include <memory>
#include <string>
#include <unordered_set>
#include <utility>
#include <vector>

#include "game/entities/animation_component.hpp"
#include "game/entities/concrete/door.hpp"
#include "game/entities/concrete/floor_trap.hpp"
#include "game/entities/concrete/mummy.hpp"
#include "game/entities/concrete/rolling_rock.hpp"
#include "game/entities/concrete/sarcophagus.hpp"
#include "game/entities/concrete/torch.hpp"
#include "game/entities/concrete/wall_trap.hpp"
#include "game/entities/entity_factory.hpp"
#include "game/entities/entity_loader.hpp"
#include "game/entities/entity_manager.hpp"
#include "game/entities/event_bus.hpp"

namespace {

    int g_failures = 0;

    void check(bool cond, const char* msg, const char* file, int line) {
        if (!cond) {
            std::cerr << "  FAIL: " << msg << "  (" << file << ":" << line << ")\n";
            ++g_failures;
        }
    }

#define REQUIRE(cond) check((cond), #cond, __FILE__, __LINE__)

    void testFactory() {
        std::cout << "[T1] factory\n";
        auto& factory = EntityFactory::instance();

        const std::vector<std::string> TYPES = {
            "torch", "sarcophagus", "door", "mummy",
            "rolling_rock", "wall_trap", "floor_trap",
        };
        for (const auto& type : TYPES) {
            fkyaml::node tmpl = EntityLoader::loadTemplate(type);
            auto ent = factory.create(type, tmpl);
            REQUIRE(ent != nullptr);
            if (ent != nullptr) { REQUIRE(ent->getName() == type); }
        }
    }

    void testLoader() {
        std::cout << "[T2] loader\n";
        auto spawns = EntityLoader::readSpawns("data/maps/test_entities.yaml");
        // Al test_entities.yaml hem declarat 5 spawns.
        REQUIRE(spawns.size() == 5);

        // Primer spawn és torch.
        if (!spawns.empty()) {
            REQUIRE(spawns[0]["type"].get_value<std::string>() == "torch");
        }
    }

    void testEventBus() {
        std::cout << "[T3] event bus\n";
        EventBus bus;

        int int_received = -1;
        int entity_ptr_flag = 0;
        bus.subscribe("a_int", [&](const Event& ev) {
            const int* v = std::get_if<int>(&ev.payload);
            if (v != nullptr) { int_received = *v; }
        });
        bus.subscribe("a_ent", [&](const Event& ev) {
            if (std::get_if<Entity*>(&ev.payload) != nullptr) { entity_ptr_flag = 1; }
        });

        bus.publish("a_int", 42);
        REQUIRE(int_received == 42);

        Entity fake;
        bus.publish("a_ent", &fake);
        REQUIRE(entity_ptr_flag == 1);

        // Publish d'un nom sense subscriptors no ha de crashejar.
        bus.publish("desconegut");

        // Unsubscribe elimina els handlers.
        auto id = bus.subscribe("a_int", [&](const Event&) { int_received = 999; });
        bus.unsubscribe(id);
        bus.publish("a_int", 7);
        REQUIRE(int_received == 7);
    }

    void testSarcophagusPerimeter() {
        std::cout << "[T4] sarcofag perimetre\n";
        fkyaml::node tmpl = EntityLoader::loadTemplate("sarcophagus");
        auto sarc = std::make_unique<Sarcophagus>(tmpl);
        // Ancorat a (col=1, row=1) amb tile_size=[3,1] → rectangle de tiles
        // cobreix (1,1), (2,1), (3,1). Perímetre ortogonal esperat (sense
        // BlockedPredicate):
        //   Nord: (1,0), (2,0), (3,0)
        //   Sud:  (1,2), (2,2), (3,2)
        //   Oest: (0,1)
        //   Est:  (4,1)
        // Total: 8 tiles.
        sarc->place(1, 1, {});
        REQUIRE(sarc->getPerimeterSize() == 8);
        REQUIRE(sarc->getState() == Sarcophagus::State::CLOSED);

        // Visitem un tile que NO és al perímetre: res canvia.
        sarc->notifyTileEntered(5, 5);
        REQUIRE(sarc->getVisitedCount() == 0);

        // Visitem tots els del perímetre.
        const std::vector<std::pair<int, int>> PERIM = {
            {1, 0}, {2, 0}, {3, 0}, {1, 2}, {2, 2}, {3, 2}, {0, 1}, {4, 1},
        };
        for (const auto& [c, r] : PERIM) { sarc->notifyTileEntered(c, r); }
        REQUIRE(sarc->getVisitedCount() == 8);
        REQUIRE(sarc->getState() == Sarcophagus::State::OPENING);

        // Un update amb l'animació `opening` d'1 frame loop=false completa
        // la transició a OPEN.
        sarc->update(0.0F);
        REQUIRE(sarc->getState() == Sarcophagus::State::OPEN);
    }

    void testEntityManagerEndToEnd() {
        std::cout << "[T5] manager end-to-end\n";
        EntityManager manager;

        // 2 sarcòfags, 1 porta.
        auto sarc1 = std::make_unique<Sarcophagus>(EntityLoader::loadTemplate("sarcophagus"));
        sarc1->place(0, 0, {});
        auto sarc2 = std::make_unique<Sarcophagus>(EntityLoader::loadTemplate("sarcophagus"));
        sarc2->place(4, 4, {});
        Sarcophagus* s1 = manager.addSarcophagus(std::move(sarc1));
        Sarcophagus* s2 = manager.addSarcophagus(std::move(sarc2));
        REQUIRE(manager.sarcophagusCount() == 2);

        auto door = std::make_unique<Door>(EntityLoader::loadTemplate("door"));
        Door* door_ptr = door.get();
        manager.add(std::move(door));
        manager.setDoor(door_ptr);

        // Subscriptor local per capturar `level_complete`.
        bool level_complete_fired = false;
        manager.getBus().subscribe("level_complete", [&](const Event&) {
            level_complete_fired = true;
        });

        // Forcem l'obertura dels dos sarcs visitant els seus perímetres.
        auto forceOpen = [](Sarcophagus* s) {
            const int COL0 = s->getTilePos().col;
            const int ROW0 = s->getTilePos().row;
            const int W = s->getTileWidth();
            const int H = s->getTileHeight();
            for (int dc = 0; dc < W; ++dc) {
                s->notifyTileEntered(COL0 + dc, ROW0 - 1);
                s->notifyTileEntered(COL0 + dc, ROW0 + H);
            }
            for (int dr = 0; dr < H; ++dr) {
                s->notifyTileEntered(COL0 - 1, ROW0 + dr);
                s->notifyTileEntered(COL0 + W, ROW0 + dr);
            }
        };
        forceOpen(s1);
        forceOpen(s2);

        // Un primer tick: cada sarc transiciona OPENING → OPEN i publica;
        // l'handler del manager compta i, en arribar al total, crida
        // door->open() — que en aquest mateix tick (la iteració sobre
        // entities continua) farà transitar la porta OPENING → OPEN perquè
        // l'animació és d'1 frame loop=false.
        manager.update(0.0F);
        REQUIRE(manager.openedSarcophagusCount() == 2);
        REQUIRE(door_ptr->getState() == Door::State::OPEN);

        // Contacte amb la porta oberta → level_complete.
        door_ptr->onPlayerContact(nullptr);
        REQUIRE(level_complete_fired);

        // Un segon contacte NO torna a disparar (idempotent).
        level_complete_fired = false;
        door_ptr->onPlayerContact(nullptr);
        REQUIRE(!level_complete_fired);
    }

    void testAnimationComponent() {
        std::cout << "[T6] animation component\n";
        AnimationComponent anim({10, 20, 30}, 10.0F, true);
        REQUIRE(anim.frameCount() == 3);
        REQUIRE(anim.currentFrame() == 10);

        anim.tick(0.15F);  // 1.5 frames de 10 fps → hauria d'avançar a l'índex 1
        REQUIRE(anim.currentFrame() == 20);

        anim.tick(0.10F);
        REQUIRE(anim.currentFrame() == 30);

        // Loop: un tick més i torna al principi.
        anim.tick(0.10F);
        REQUIRE(anim.currentFrame() == 10);

        // Variant no-loop: es para al darrer i queda completed.
        AnimationComponent once({1, 2}, 10.0F, false);
        once.tick(1.0F);  // molts frames; ha d'arribar al final i quedar-se.
        REQUIRE(once.currentFrame() == 2);
        REQUIRE(once.completed());

        // Variant d'1 frame no-loop: completed des del principi.
        AnimationComponent single({5}, 1.0F, false);
        REQUIRE(single.completed());
    }

    void testAllTemplatesLoad() {
        std::cout << "[T7] plantilles YAML\n";
        const std::vector<std::string> TYPES = {
            "torch", "sarcophagus", "door", "mummy",
            "rolling_rock", "wall_trap", "floor_trap",
        };
        for (const auto& type : TYPES) {
            try {
                fkyaml::node tmpl = EntityLoader::loadTemplate(type);
                REQUIRE(tmpl.contains("name"));
                REQUIRE(tmpl["name"].get_value<std::string>() == type);
            } catch (const std::exception& e) {
                std::cerr << "  excepció carregant '" << type << "': " << e.what() << '\n';
                ++g_failures;
            }
        }
    }

    void testDecorationFlags() {
        std::cout << "[T8] decoration flags\n";
        fkyaml::node tmpl = EntityLoader::loadTemplate("torch");
        Torch torch(tmpl);
        REQUIRE(!torch.collides());
        REQUIRE(!torch.interactable());
    }

}  // namespace

auto main() -> int {
    std::cout << "== smoke tests: entity system ==\n";

    testFactory();
    testLoader();
    testEventBus();
    testSarcophagusPerimeter();
    testEntityManagerEndToEnd();
    testAnimationComponent();
    testAllTemplatesLoad();
    testDecorationFlags();

    if (g_failures == 0) {
        std::cout << "ALL OK\n";
        return 0;
    }
    std::cerr << g_failures << " smoke check(s) failed\n";
    return 1;
}