#include "game/scenes/logo_scene.hpp"

#include <SDL3/SDL.h>

#include <algorithm>
#include <cstdint>
#include <iostream>
#include <utility>

#include "core/audio/audio.hpp"
#include "core/input/global_inputs.hpp"
#include "core/rendering/notifier.hpp"
#include "core/rendering/render_info.hpp"
#include "core/rendering/screen.hpp"
#include "core/rendering/surface.hpp"
#include "core/system/event_buffer.hpp"
#include "core/ui/ui_config.hpp"
#include "game/options.hpp"
#include "game/scenes/placeholder_input.hpp"
#include "game/scenes/scene_flow.hpp"
#include "utils/defines.hpp"

namespace {

    // TODO: migrar a un logger unificat quan es decideixi (veure INC-03 a
    // docs/audit-core-rendering.md). De moment std::cout per rastrejar el
    // flux d'escenes als smoke runs.
    const char* const SCENE_NAME = "LOGO";

}  // namespace

LogoScene::LogoScene(std::shared_ptr<Surface> logo, bool reset)
    : logo_(std::move(logo)) {
    std::cout << "[scene] " << SCENE_NAME << (reset ? " start (reset)\n" : " start\n");
    if (reset) {
        if (auto* audio = Audio::get(); audio != nullptr) {
            audio->stopMusic();
            audio->stopAllSounds();
        }
    }
    // Arranca el fade-in: el primer frame ja pinta negre opac que
    // s'esvaeix cap a la imatge durant FADE_IN_MS.
    fade_.begin(FADE_IN_MS, Transitions::FadeToBlack::Direction::FADE_IN);
}

LogoScene::~LogoScene() = default;

auto LogoScene::wantsSkip() -> bool {
    return std::ranges::any_of(EventBuffer::events, [](const SDL_Event& ev) {
        return ev.type == SDL_EVENT_KEY_DOWN && !Placeholder::isReservedScancode(ev.key.scancode);
    });
}

void LogoScene::enterMiddle() {
    phase_ = Phase::MIDDLE;
    phase_elapsed_ms_ = 0;
}

void LogoScene::enterFadeOut() {
    phase_ = Phase::FADE_OUT;
    phase_elapsed_ms_ = 0;
    fade_.begin(FADE_OUT_MS, Transitions::FadeToBlack::Direction::FADE_OUT);
}

void LogoScene::enterDone() {
    phase_ = Phase::DONE;
    exit_request_ = ExitRequest{.next = SceneId::TITLE, .params = TitleParams{}};
}

void LogoScene::update(int delta_ms) {
    GlobalInputs::update(delta_ms);
    if (GlobalInputs::wantsQuit()) {
        wants_quit_ = true;
        return;
    }

    // Skip: qualsevol tecla no reservada salta directament a la
    // transició cap a TITLE. El propi TitleScene fa el seu fade-in
    // inicial des de negre, així que la sortida no queda abrupta.
    if (phase_ != Phase::DONE && wantsSkip()) {
        enterDone();
    }

    if (phase_ != Phase::DONE) {
        phase_elapsed_ms_ += delta_ms;
        fade_.tick(delta_ms);
    }

    switch (phase_) {
        case Phase::FADE_IN:
            if (phase_elapsed_ms_ >= FADE_IN_MS) { enterMiddle(); }
            break;
        case Phase::MIDDLE:
            // Música del títol al cor de la fase central. La crida és
            // idempotent (Audio detecta same-track + same-loop i no
            // reinicia), així que TitleScene podrà fer el seu propi
            // playMusic sense interrompre la pista.
            if (!music_started_ && phase_elapsed_ms_ >= MUSIC_TRIGGER_MS) {
                music_started_ = true;
                if (auto* audio = Audio::get(); audio != nullptr) {
                    audio->playMusic("title.ogg", -1);
                }
            }
            if (phase_elapsed_ms_ >= MIDDLE_MS) { enterFadeOut(); }
            break;
        case Phase::FADE_OUT:
            if (phase_elapsed_ms_ >= FADE_OUT_MS) { enterDone(); }
            break;
        case Phase::DONE:
            break;
    }

    Notifier::get().update(delta_ms);
    RenderInfo::get().update(delta_ms, Options::buildRenderInfoFrame(UiConfig::get().renderInfoText(), UiConfig::get().renderInfoShadow()));
}

void LogoScene::render() {
    constexpr std::uint32_t BLACK_ARGB = 0xFF000000U;
    Screen::get().fillRect(0, 0, GameCanvas::WIDTH, GameCanvas::HEIGHT, BLACK_ARGB);

    if (logo_) {
        const int X = (GameCanvas::WIDTH - logo_->getWidth()) / 2;
        const int Y = (GameCanvas::HEIGHT - logo_->getHeight()) / 2;
        logo_->render(X, Y);
    }

    Notifier::get().render();
    // Capa de fosa: durant FADE_IN i FADE_OUT pinta el negre semitransparent
    // per damunt del logo i del Notifier (no del RenderInfo, que és overlay
    // de debug i ha de mantenir-se llegible).
    fade_.render();
    RenderInfo::get().render();
    Screen::get().present();
}