import matplotlib.pyplot as plt
import numpy as np

def generate_picture_inlay(all_group_vars, picture_path, DEBUG=False):
    try:
        vars = all_group_vars['inlay']
        x_num, y_num = int(vars['x_num']), int(vars['y_num'])
        x_offset_mm, y_offset_mm = float(vars['x_offset']), float(vars['y_offset'])
        canvas_width_mm, canvas_height_mm = 800, 1200
        x_offset = x_offset_mm / canvas_height_mm  # Swapping due to axis swap
        y_offset = y_offset_mm / canvas_width_mm   # Swapping due to axis swap

        if x_num <= 0 or y_num <= 0:
            raise ValueError("x_num and y_num must be positive integers.")

        fig, ax = plt.subplots(figsize=(12, 8))
        ax.set_facecolor('black')

        total_x_offset = x_offset * (y_num + 1)
        total_y_offset = y_offset * (x_num + 1)
        rect_width = (1 - total_y_offset) / x_num
        rect_height = (1 - total_x_offset) / y_num

        for j in range(x_num):
            for i in range(y_num):
                # Mirroring horizontally
                x_start = 1 - (y_offset + i * (rect_height + y_offset) + rect_height)
                y_start = x_offset + j * (rect_width + x_offset)

                rect = plt.Rectangle((x_start, y_start), rect_height, rect_width, color='white')
                ax.add_patch(rect)

                triangle = plt.Polygon([
                    (x_start + rect_height, y_start),  # Bottom right of the rectangle
                    (x_start + rect_height - 0.05 * rect_height, y_start),  # Left along the bottom
                    (x_start + rect_height, y_start + 0.05 * rect_width)  # Up from the bottom right
                ], color='black')
                ax.add_patch(triangle)

        # Arrows with adjusted margins
        ax.arrow(0.98, 0.02, -0.9, 0, head_width=0.03, head_length=0.02, fc='green', ec='green', linewidth=2, edgecolor='white')
        ax.arrow(0.98, 0.02, 0, 0.9, head_width=0.02, head_length=0.03, fc='red', ec='red', linewidth=2, edgecolor='white')

        ax.set_xlim(0, 1)
        ax.set_ylim(0, 1)
        ax.set_xticks([]), ax.set_yticks([])
        plt.subplots_adjust(left=0.1, right=0.9, top=0.9, bottom=0.1)  # Adjusting the margins
        ax.set_xlim(1, 0)  # Flipping the x-axis
        ax.set_ylim(1, 0)  # Flipping the y-axis

        if DEBUG:
            plt.show()
        else:
            fig.savefig(picture_path, bbox_inches='tight', pad_inches=0.5, dpi=300, transparent=True)  # Adjusted padding
        plt.close()

    except ValueError as ve:
        print(f"Invalid Input: {ve}")
    except Exception as e:
        print(f"Error generating matrix: {e}")

if __name__ == "__main__":
    vars = {'x_num': 5, 'y_num': 3, 'x_offset': 20, 'y_offset': 20}
    picture_path = "cfg_picture/TEST_inlay.jpg"
    generate_picture_inlay({'inlay': vars}, picture_path, DEBUG=True)