// playfield_grid.cpp - Implementació de la grilla de fons
// © 2026 JailDesigner

#include "core/graphics/playfield_grid.hpp"

#include "core/defaults.hpp"
#include "core/rendering/line_renderer.hpp"

namespace Graphics {

    PlayfieldGrid::PlayfieldGrid(Rendering::Renderer* renderer)
        : renderer_(renderer) {}

    void PlayfieldGrid::draw() const {
        const SDL_FRect& zona = Defaults::Zones::PLAYAREA;
        const float CELL_W = zona.w / static_cast<float>(Defaults::Grid::COLUMNS);
        const float CELL_H = zona.h / static_cast<float>(Defaults::Grid::ROWS);
        const float SUB_W = CELL_W / static_cast<float>(Defaults::Grid::SUBDIVISIONS);
        const float SUB_H = CELL_H / static_cast<float>(Defaults::Grid::SUBDIVISIONS);
        const int SUB_VERTS = Defaults::Grid::COLUMNS * Defaults::Grid::SUBDIVISIONS;
        const int SUB_HORIZ = Defaults::Grid::ROWS * Defaults::Grid::SUBDIVISIONS;

        const int X1 = static_cast<int>(zona.x);
        const int Y1 = static_cast<int>(zona.y);
        const int X2 = static_cast<int>(zona.x + zona.w);
        const int Y2 = static_cast<int>(zona.y + zona.h);

        // PRIMER: sub-graella (queda per dessota — pintem primer).
        // Saltem les posicions que coincideixen amb la graella principal (i % SUBDIVISIONS == 0).
        for (int i = 1; i < SUB_VERTS; i++) {
            if (i % Defaults::Grid::SUBDIVISIONS == 0) {
                continue;
            }
            const int X = static_cast<int>(zona.x + (static_cast<float>(i) * SUB_W));
            Rendering::linea(renderer_, X, Y1, X, Y2, Defaults::Grid::SUBGRID_BRIGHTNESS);
        }
        for (int j = 1; j < SUB_HORIZ; j++) {
            if (j % Defaults::Grid::SUBDIVISIONS == 0) {
                continue;
            }
            const int Y = static_cast<int>(zona.y + (static_cast<float>(j) * SUB_H));
            Rendering::linea(renderer_, X1, Y, X2, Y, Defaults::Grid::SUBGRID_BRIGHTNESS);
        }

        // SEGON: graella principal (línies interiors, no repetim el border).
        for (int i = 1; i < Defaults::Grid::COLUMNS; i++) {
            const int X = static_cast<int>(zona.x + (static_cast<float>(i) * CELL_W));
            Rendering::linea(renderer_, X, Y1, X, Y2, Defaults::Grid::BRIGHTNESS);
        }
        for (int j = 1; j < Defaults::Grid::ROWS; j++) {
            const int Y = static_cast<int>(zona.y + (static_cast<float>(j) * CELL_H));
            Rendering::linea(renderer_, X1, Y, X2, Y, Defaults::Grid::BRIGHTNESS);
        }
    }

}  // namespace Graphics