#ifdef _DEBUG

#include "game/editor/tile_picker.hpp"

#include <algorithm>  // Para std::clamp, std::min

#include "core/rendering/screen.hpp"          // Para Screen
#include "core/rendering/surface.hpp"         // Para Surface
#include "core/resources/resource_cache.hpp"  // Para Resource::Cache
#include "utils/defines.hpp"                  // Para Tile::SIZE, PlayArea
#include "utils/utils.hpp"                    // Para stringToColor

// Margen del borde alrededor del tileset (en pixels)
static constexpr int BORDER_PAD = 3;

// Abre el picker con un tileset
void TilePicker::open(const std::string& tileset_name, int current_tile, int bg_color, int source_color, int target_color) {
    tileset_ = Resource::Cache::get()->getSurface(tileset_name);
    if (!tileset_) {
        open_ = false;
        return;
    }

    tileset_width_ = static_cast<int>(tileset_->getWidth()) / Tile::SIZE;
    tileset_height_ = static_cast<int>(tileset_->getHeight()) / Tile::SIZE;
    current_tile_ = current_tile;
    hover_tile_ = -1;
    scroll_y_ = 0;

    int tileset_px_w = tileset_width_ * Tile::SIZE;
    int tileset_px_h = tileset_height_ * Tile::SIZE;

    // Crear surface con borde: tileset + BORDER_PAD pixels a cada lado
    int frame_w = tileset_px_w + BORDER_PAD * 2;
    int frame_h = tileset_px_h + BORDER_PAD * 2;
    frame_surface_ = std::make_shared<Surface>(frame_w, frame_h);

    // Componer: fondo + borde + tileset (con sustitución de color opcional)
    {
        auto prev = Screen::get()->getRendererSurface();
        Screen::get()->setRendererSurface(frame_surface_);

        // Fondo: color personalizado o negro por defecto
        Uint8 fill_color = (bg_color >= 0) ? static_cast<Uint8>(bg_color) : stringToColor("black");
        frame_surface_->clear(fill_color);

        // Borde doble (bright_white + white)
        SDL_FRect outer = {.x = 0, .y = 0, .w = static_cast<float>(frame_w), .h = static_cast<float>(frame_h)};
        frame_surface_->drawRectBorder(&outer, stringToColor("bright_white"));
        SDL_FRect inner = {.x = 1, .y = 1, .w = static_cast<float>(frame_w - 2), .h = static_cast<float>(frame_h - 2)};
        frame_surface_->drawRectBorder(&inner, stringToColor("white"));

        // Tileset dentro del borde (con o sin sustitución de color)
        if (source_color >= 0 && target_color >= 0) {
            tileset_->renderWithColorReplace(BORDER_PAD, BORDER_PAD, static_cast<Uint8>(source_color), static_cast<Uint8>(target_color));
        } else {
            SDL_FRect dst_rect = {.x = static_cast<float>(BORDER_PAD), .y = static_cast<float>(BORDER_PAD), .w = static_cast<float>(tileset_px_w), .h = static_cast<float>(tileset_px_h)};
            tileset_->render(nullptr, &dst_rect);
        }

        Screen::get()->setRendererSurface(prev);
    }

    // Centrar en el play area
    offset_x_ = (PlayArea::WIDTH - frame_w) / 2;
    int offset_y = (PlayArea::HEIGHT - frame_h) / 2;
    if (offset_y < 0) { offset_y = 0; }

    // Área visible
    visible_height_ = PlayArea::HEIGHT;

    // Posición de destino del frame
    frame_dst_ = {.x = static_cast<float>(offset_x_), .y = static_cast<float>(offset_y), .w = static_cast<float>(frame_w), .h = static_cast<float>(frame_h)};

    // Si el frame es más alto que el play area, necesitará scroll
    if (frame_h > visible_height_) {
        frame_dst_.y = 0;
        // Scroll hasta el tile actual si está fuera de vista
        if (current_tile_ >= 0) {
            int tile_row = current_tile_ / tileset_width_;
            int tile_y_px = tile_row * Tile::SIZE;
            if (tile_y_px > visible_height_ / 2) {
                scroll_y_ = tile_y_px - visible_height_ / 2;
            }
        }
    }

    open_ = true;
}

// Cierra el picker
void TilePicker::close() {
    open_ = false;
    tileset_.reset();
    frame_surface_.reset();
}

// Renderiza el picker
void TilePicker::render() {
    if (!open_ || !frame_surface_) { return; }

    auto game_surface = Screen::get()->getRendererSurface();
    if (!game_surface) { return; }

    int frame_h = static_cast<int>(frame_dst_.h);

    if (frame_h <= visible_height_) {
        // El frame cabe entero: renderizar tal cual (flotando sobre el mapa)
        frame_surface_->render(nullptr, &frame_dst_);
    } else {
        // El frame no cabe: renderizar porción visible con scroll
        int max_scroll = frame_h - visible_height_;
        scroll_y_ = std::clamp(scroll_y_, 0, max_scroll);

        SDL_FRect src = {.x = 0, .y = static_cast<float>(scroll_y_), .w = frame_dst_.w, .h = static_cast<float>(visible_height_)};
        SDL_FRect dst = {.x = frame_dst_.x, .y = 0, .w = frame_dst_.w, .h = static_cast<float>(visible_height_)};
        frame_surface_->render(&src, &dst);
    }

    // Los highlights se dibujan directamente en game_surface (encima del frame)
    float tileset_screen_x = frame_dst_.x + BORDER_PAD;
    float tileset_screen_y = frame_dst_.y + BORDER_PAD - static_cast<float>(scroll_y_);

    // Highlight del tile bajo el cursor (blanco)
    if (hover_tile_ >= 0) {
        int col = hover_tile_ % tileset_width_;
        int row = hover_tile_ / tileset_width_;
        float hx = tileset_screen_x + static_cast<float>(col * Tile::SIZE);
        float hy = tileset_screen_y + static_cast<float>(row * Tile::SIZE);
        if (hy >= 0 && hy + Tile::SIZE <= visible_height_) {
            SDL_FRect highlight = {.x = hx, .y = hy, .w = static_cast<float>(Tile::SIZE), .h = static_cast<float>(Tile::SIZE)};
            game_surface->drawRectBorder(&highlight, stringToColor("bright_white"));
        }
    }

    // Highlight del tile actual (verde)
    if (current_tile_ >= 0) {
        int col = current_tile_ % tileset_width_;
        int row = current_tile_ / tileset_width_;
        float cx = tileset_screen_x + static_cast<float>(col * Tile::SIZE);
        float cy = tileset_screen_y + static_cast<float>(row * Tile::SIZE);
        if (cy >= 0 && cy + Tile::SIZE <= visible_height_) {
            SDL_FRect cur_rect = {.x = cx, .y = cy, .w = static_cast<float>(Tile::SIZE), .h = static_cast<float>(Tile::SIZE)};
            game_surface->drawRectBorder(&cur_rect, stringToColor("bright_green"));
        }
    }
}

// Maneja eventos del picker
void TilePicker::handleEvent(const SDL_Event& event) {
    if (!open_) { return; }

    if (event.type == SDL_EVENT_MOUSE_MOTION) {
        updateMousePosition();
    }

    if (event.type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
        if (event.button.button == SDL_BUTTON_LEFT && hover_tile_ >= 0) {
            if (on_select) { on_select(hover_tile_); }
            close();
        } else if (event.button.button == SDL_BUTTON_RIGHT) {
            close();
        }
    }

    if (event.type == SDL_EVENT_MOUSE_WHEEL) {
        scroll_y_ -= static_cast<int>(event.wheel.y) * Tile::SIZE * 2;
        int max_scroll = static_cast<int>(frame_dst_.h) - visible_height_;
        if (max_scroll < 0) { max_scroll = 0; }
        scroll_y_ = std::clamp(scroll_y_, 0, max_scroll);
        updateMousePosition();
    }

    if (event.type == SDL_EVENT_KEY_DOWN && event.key.key == SDLK_ESCAPE) {
        close();
    }
}

// Calcula qué tile está bajo el cursor
void TilePicker::updateMousePosition() {
    float mouse_x = 0.0F;
    float mouse_y = 0.0F;
    SDL_GetMouseState(&mouse_x, &mouse_y);

    float render_x = 0.0F;
    float render_y = 0.0F;
    SDL_RenderCoordinatesFromWindow(Screen::get()->getRenderer(), mouse_x, mouse_y, &render_x, &render_y);

    SDL_FRect dst_rect = Screen::get()->getGameSurfaceDstRect();
    float game_x = render_x - dst_rect.x;
    float game_y = render_y - dst_rect.y;

    // Coordenada relativa al tileset (dentro del frame, con scroll)
    float tileset_x = game_x - frame_dst_.x - BORDER_PAD;
    float tileset_y = game_y - frame_dst_.y - BORDER_PAD + static_cast<float>(scroll_y_);

    int tile_x = static_cast<int>(tileset_x) / Tile::SIZE;
    int tile_y = static_cast<int>(tileset_y) / Tile::SIZE;

    if (tileset_x >= 0 && tile_x >= 0 && tile_x < tileset_width_ &&
        tileset_y >= 0 && tile_y >= 0 && tile_y < tileset_height_) {
        hover_tile_ = tile_y * tileset_width_ + tile_x;
    } else {
        hover_tile_ = -1;
    }
}

#endif  // _DEBUG