from svgpathtools import svg2paths, Path, Line, CubicBezier, QuadraticBezier, Arc
import numpy as np
import csv
from collections import defaultdict
from typing import List, Tuple
import numpy as np
import matplotlib.pyplot as plt
from scipy.spatial.distance import cdist
import heapq
from scipy.spatial.distance import cdist
import math
from collections import defaultdict
import heapq

class CSVProcessor:
    """
    Processes and loads data points from a CSV file.
    """

    def __init__(self, csv_file: str):
        """
        Initializes with the CSV file path.
        """
        self.csv_file = csv_file
        self.all_points = []

    def load_points_from_csv(self):
        """
        Loads data points from the CSV file into all_points.
        """
        with open(self.csv_file, newline='') as csvfile:
            reader = csv.reader(csvfile)
            for row in reader:
                curve_index = row[0]
                x = float(row[2])
                y = float(row[3])
                self.all_points.append((curve_index, 0.0000, x, y))

class CurveProcessor:
    """
    Processes curves for simplification and refinement based on given parameters.
    """

    def __init__(self, curves: dict[int, List[Tuple[float, float]]], epsilon: float = 5.0, threshold: float = 5.0):
        """
        Initializes with curves, epsilon for simplification, and threshold for endpoint adjustment.
        """
        self.curves = curves
        self.epsilon = epsilon
        self.threshold = threshold
        self.simplified_curves = {}
        self.inverse_dict = {}
        self.segment_points_dict = {}
        self.updated_curves = {}

    def point_line_distance(self, point, start, end):
        """
        Calculates the perpendicular distance from a point to a line segment.
        """
        point = np.array(point)
        start = np.array(start)
        end = np.array(end)

        if np.array_equal(start, end):
            return np.linalg.norm(point - start)
        else:
            n = abs((end[1] - start[1]) * point[0] - (end[0] - start[0]) * point[1] + end[0] * start[1] - end[1] * start[0])
            d = np.linalg.norm(end - start)
            return n / d

    def ramer_douglas_peucker(self, points, epsilon):
        """
        Simplifies a list of points using the Ramer-Douglas-Peucker algorithm.
        """
        dmax = 0.0
        index = 0
        end = len(points)
        for i in range(1, end - 1):
            d = self.point_line_distance(points[i], points[0], points[-1])
            if d > dmax:
                index = i
                dmax = d

        if dmax > epsilon:
            rec_results1, idx1 = self.ramer_douglas_peucker(points[:index+1], epsilon)
            rec_results2, idx2 = self.ramer_douglas_peucker(points[index:], epsilon)
            result = rec_results1[:-1] + rec_results2
            result_indices = idx1[:-1] + [i + index for i in idx2]
        else:
            result = [points[0], points[-1]]
            result_indices = [0, len(points) - 1]

        return result, result_indices

    def simplify_curves(self):
        """
        Simplifies all curves and stores segment information.
        """
        simplified_curves = {}
        inverse_dict = {}
        segment_points_dict = {}
        segment_id = 0

        for index, points in self.curves.items():
            simplified_points, indices = self.ramer_douglas_peucker(points, self.epsilon)

            for i in range(len(simplified_points) - 1):
                start_point = tuple(simplified_points[i])
                end_point = tuple(simplified_points[i + 1])
                line_key = (start_point, end_point)

                segment_indices = indices[i:i+2]
                segment_start_idx = segment_indices[0]
                segment_end_idx = segment_indices[1]

                simplified_curves[segment_id] = [start_point, end_point]
                inverse_dict[line_key] = segment_id
                segment_points_dict[segment_id] = points[segment_start_idx:segment_end_idx+1]

                segment_id += 1

        self.simplified_curves = simplified_curves
        self.inverse_dict = inverse_dict
        self.segment_points_dict = segment_points_dict

    def distance(self, point1, point2):
        """
        Computes the Euclidean distance between two points.
        """
        return np.linalg.norm(np.array(point1) - np.array(point2))

    def midpoint(self, point1, point2):
        """
        Returns the midpoint between two points.
        """
        return ((point1[0] + point2[0]) / 2, (point1[1] + point2[1]) / 2)

    def round_point(self, point):
        """
        Rounds the coordinates of a point to one decimal place.
        """
        return (round(point[0], 1), round(point[1], 1))

    def update_endpoints_with_midpoints(self):
        """
        Adjusts segment endpoints based on proximity and rounds the results.
        """
        endpoints = {}
        updated_curves = {k: v[:] for k, v in self.simplified_curves.items()}
        inverse_dict = {}

        for key, points in self.simplified_curves.items():
            endpoints[key] = (points[0], points[-1])

        for key, (start, end) in endpoints.items():
            if self.distance(start, end) < self.threshold:
                mid = self.midpoint(start, end)
                updated_curves[key][0] = mid
                updated_curves[key][-1] = mid

        for key1, (start1, end1) in endpoints.items():
            for key2, (start2, end2) in endpoints.items():
                if key1 < key2:
                    if self.distance(start1, start2) < self.threshold:
                        mid = self.midpoint(start1, start2)
                        updated_curves[key1][0] = mid
                        updated_curves[key2][0] = mid
                    if self.distance(start1, end2) < self.threshold:
                        mid = self.midpoint(start1, end2)
                        updated_curves[key1][0] = mid
                        updated_curves[key2][-1] = mid
                    if self.distance(end1, start2) < self.threshold:
                        mid = self.midpoint(end1, start2)
                        updated_curves[key1][-1] = mid
                        updated_curves[key2][0] = mid
                    if self.distance(end1, end2) < self.threshold:
                        mid = self.midpoint(end1, end2)
                        updated_curves[key1][-1] = mid
                        updated_curves[key2][-1] = mid

        for key, points in updated_curves.items():
            updated_curves[key] = [self.round_point(point) for point in points]

        for index, points in updated_curves.items():
            for i in range(len(points) - 1):
                start_point = tuple(points[i])
                end_point = tuple(points[i + 1])
                line_key = (start_point, end_point)
                inverse_dict[line_key] = index

        self.updated_curves = updated_curves
        self.inverse_dict = inverse_dict

    def plot_segments(self, curves, inverse_dict, title):
        """
        Plots line segments with labels.
        """
        plt.figure(figsize=(10, 6))
        for (start, end), segment_id in inverse_dict.items():
            x = [start[0], end[0]]
            y = [start[1], end[1]]
            plt.plot(x, y, marker='o', label=f'Segment {segment_id}')
        plt.title(title)
        plt.xlabel('X')
        plt.ylabel('Y')
        plt.legend()
        plt.grid(True)
        plt.show()

    def plot_points(self, curves, title):
        """
        Plots points for all curves.
        """
        plt.figure(figsize=(10, 6))
        for points in curves.values():
            x, y = zip(*points)
            plt.plot(x, y, marker='o', linestyle='None')
        plt.title(title)
        plt.xlabel('X')
        plt.ylabel('Y')
        plt.grid(True)
        plt.show()

    def process(self):
        """
        Executes curve simplification and endpoint updates.
        """
        self.simplify_curves()
        self.update_endpoints_with_midpoints()

class CycleDetector:
    """Detects cycles in a set of updated curves."""

    def __init__(self, updated_curves: dict[int, List[Tuple[float, float]]]):
        """Initialize with updated curves and construct adjacency list."""
        self.adj_list, self.segments = self.construct_adj_list(updated_curves)

    def construct_adj_list(self, updated_curves):
        """Create an adjacency list and segment list from the updated curves."""
        adj_list = defaultdict(list)
        segments = []
        for polyline in updated_curves.values():
            for i in range(len(polyline) - 1):
                start, end = polyline[i], polyline[i + 1]
                adj_list[start].append(end)
                adj_list[end].append(start)
                segments.append((start, end))
        return adj_list, segments

    def find_cycles(self, graph):
        """Find all cycles in the graph using depth-first search (DFS)."""
        def dfs(node, start, visited, path):
            visited[node] = True
            path.append(node)

            for neighbor in graph[node]:
                if neighbor == start and len(path) > 2:
                    cycle = path[:] + [start]
                    cycles.append(cycle)
                elif not visited[neighbor]:
                    dfs(neighbor, start, visited, path)

            path.pop()
            visited[node] = False

        cycles = []
        visited = defaultdict(bool)

        for node in graph:
            if not visited[node]:
                dfs(node, node, visited, [])

        unique_cycles = []
        for cycle in cycles:
            cycle_set = set(cycle)
            if all(cycle_set != set(c) for c in unique_cycles):
                unique_cycles.append(cycle)

        return unique_cycles

    def separate_non_cycle_lines(self, segments, cycles):
        """Separate non-cycle lines from the segments."""
        cycle_edges = set()
        for cycle in cycles:
            for i in range(len(cycle) - 1):
                edge = tuple(sorted([cycle[i], cycle[i + 1]]))
                cycle_edges.add(edge)

        non_cycle_lines = []
        for start, end in segments:
            edge = tuple(sorted([start, end]))
            if edge not in cycle_edges:
                non_cycle_lines.append((start, end))

        return non_cycle_lines

    def process_cycles(self):
        """Detect cycles and separate non-cycle lines."""
        cycles = self.find_cycles(self.adj_list)
        non_cycle_lines = self.separate_non_cycle_lines(self.segments, cycles)
        return cycles, non_cycle_lines

class CircleDetector:
    """Detects circles that best fit polygons and identifies remaining sides."""

    def __init__(self, unique_cycles):
        """Initialize with a list of unique cycles.

        Args:
            unique_cycles (list): List of polygons where each polygon is a list of points.
        """
        self.unique_cycles = unique_cycles
        self.remaining_sides = set()
        self.marked_sides = set()

    def point_to_segment_dist(self, p, v, w):
        """Compute the squared distance from point p to the segment vw.

        Args:
            p (np.array): Point for which distance is to be computed.
            v (np.array): One endpoint of the segment.
            w (np.array): The other endpoint of the segment.

        Returns:
            float: Squared distance from p to the segment vw.
        """
        l2 = np.sum((v - w) ** 2)
        if l2 == 0:
            return np.sum((p - v) ** 2)
        t = max(0, min(1, np.dot(p - v, w - v) / l2))
        projection = v + t * (w - v)
        return np.sum((p - projection) ** 2)

    def mean_square_circle_error(self, polygon, center, radius, num_points=10):
        """Calculate the mean squared error of fitting a circle to a polygon.

        Args:
            polygon (list): List of points representing the polygon.
            center (np.array): Center of the circle.
            radius (float): Radius of the circle.
            num_points (int): Number of points to sample per segment.

        Returns:
            float: Mean squared error of the circle fit.
        """
        total_error = 0
        total_samples = 0

        for i in range(len(polygon)):
            p1 = polygon[i]
            p2 = polygon[(i + 1) % len(polygon)]

            segment_points = np.linspace(p1, p2, num_points)

            for point in segment_points:
                closest_point = self.closest_point_on_circle(point, center, radius)
                dist = np.linalg.norm(point - closest_point)
                error = dist ** 2
                total_error += error

            total_samples += len(segment_points)

        mse = total_error / total_samples
        return mse

    def closest_point_on_circle(self, point, center, radius):
        """Find the closest point on the circle to a given point.

        Args:
            point (np.array): Point for which closest circle point is computed.
            center (np.array): Center of the circle.
            radius (float): Radius of the circle.

        Returns:
            np.array: Closest point on the circle to the given point.
        """
        direction = point - center
        direction /= np.linalg.norm(direction)
        return center + direction * radius

    def best_fit_circle(self, polygon):
        """Find the best fit circle for a polygon using random sampling.

        Args:
            polygon (list): List of points representing the polygon.

        Returns:
            tuple: Center (np.array), radius (float), and mean squared error (float) of the best fit circle.
        """
        polygon = np.array(polygon)

        best_mse = float('inf')
        best_center = None
        best_radius = None

        for _ in range(50):
            sample_indices = np.random.choice(len(polygon), 3, replace=False)
            sample_points = polygon[sample_indices]

            A = sample_points[0]
            B = sample_points[1]
            C = sample_points[2]

            D = 2 * (A[0] * (B[1] - C[1]) + B[0] * (C[1] - A[1]) + C[0] * (A[1] - B[1]))
            if D == 0:
                continue

            Ux = ((A[0]**2 + A[1]**2) * (B[1] - C[1]) + (B[0]**2 + B[1]**2) * (C[1] - A[1]) + (C[0]**2 + C[1]**2) * (A[1] - B[1])) / D
            Uy = ((A[0]**2 + A[1]**2) * (C[0] - B[0]) + (B[0]**2 + B[1]**2) * (A[0] - C[0]) + (C[0]**2 + C[1]**2) * (B[0] - A[0])) / D
            center = np.array([Ux, Uy])
            radius = np.linalg.norm(center - A)

            mse = self.mean_square_circle_error(polygon, center, radius)
            if mse < best_mse:
                best_mse = mse
                best_center = center
                best_radius = radius

        return best_center, best_radius, best_mse

    def plot_polygon_and_circle(self, polygon, center, radius, label):
        """Plot the polygon and the best fit circle.

        Args:
            polygon (list): List of points representing the polygon.
            center (np.array): Center of the circle.
            radius (float): Radius of the circle.
            label (str): Label for the circle in the plot.
        """
        polygon = np.array(polygon)
        theta = np.linspace(0, 2 * np.pi, 100)
        circle_x = center[0] + radius * np.cos(theta)
        circle_y = center[1] + radius * np.sin(theta)

        plt.plot(circle_x, circle_y, 'r--', label=label)
        plt.scatter(*center, color='green', zorder=5, label='Center')

    def plot_remaining_sides(self, unique_cycles, marked_sides):
        """Plot remaining sides of polygons that are not marked.

        Args:
            unique_cycles (list): List of polygons where each polygon is a list of points.
            marked_sides (set): Set of marked sides.
        """
        for polygon in unique_cycles:
            polygon = np.array(polygon)
            for i in range(len(polygon)):
                side = tuple(sorted([tuple(polygon[i]), tuple(polygon[(i + 1) % len(polygon)])]))
                if side not in marked_sides:
                    plt.plot(*np.array([polygon[i], polygon[(i + 1) % len(polygon)]]).T, 'k-', label='Remaining Side' if i == 0 else "")

    def detect_circles(self):
        """Detect circles fitting the polygons and plot results.

        Returns:
            tuple: A tuple containing two elements:
                - filtered_unused_loops (list): List of polygons that do not fit any circle.
                - possible_circles (list): List of tuples (center, radius, polygon) for possible circles.
        """
        min_heap = []
        possible_circles = []
        unused_loops = []

        for polygon in self.unique_cycles:
            center, radius, mse = self.best_fit_circle(polygon)
            heapq.heappush(min_heap, (mse, center, radius, polygon))

        while min_heap:
            mse, center, radius, polygon = heapq.heappop(min_heap)

            contains_marked_side = False
            for i in range(len(polygon)):
                side = tuple(sorted([tuple(polygon[i]), tuple(polygon[(i + 1) % len(polygon)])]))
                if side in self.marked_sides:
                    contains_marked_side = True
                    break

            if contains_marked_side:
                unused_loops.append(polygon)
                continue

            self.plot_polygon_and_circle(polygon, center, radius, label='Best Fit Circle')
            self.plot_remaining_sides(self.unique_cycles, self.marked_sides)
            plt.legend()
            plt.axis('equal')
            plt.show()
            print(f'Mean Square Fitting Error: {mse:.4f}')

            if mse < 25:
                possible_circles.append((center, radius, polygon))

                for i in range(len(polygon)):
                    side = tuple(sorted([tuple(polygon[i]), tuple(polygon[(i + 1) % len(polygon)])]))
                    self.marked_sides.add(side)
            else:
                unused_loops.append(polygon)

        filtered_unused_loops = []
        for loop in unused_loops:
            all_sides_unused = True
            for i in range(len(loop)):
                side = tuple(sorted([tuple(loop[i]), tuple(loop[(i + 1) % len(loop)])]))
                if side in self.marked_sides:
                    all_sides_unused = False
                    break
            if all_sides_unused:
                filtered_unused_loops.append(loop)

        plt.figure()

        self.plot_remaining_sides(self.unique_cycles, self.marked_sides)
        for polygon in self.unique_cycles:
            polygon = np.array(polygon)
            for i in range(len(polygon)):
                side = tuple(sorted([tuple(polygon[i]), tuple(polygon[(i + 1) % len(polygon)])]))
                if side not in self.marked_sides:
                    self.remaining_sides.add(side)

        self.remaining_sides = set([
            ((float(x1), float(y1)), (float(x2), float(y2)))
            for ((x1, y1), (x2, y2)) in self.remaining_sides
        ])

        print("Final Possible Circles are : ")
        for center, radius, polygon in possible_circles:
            self.plot_polygon_and_circle(polygon, center, radius, label='Best Fit Circle')

        plt.legend()
        plt.axis('equal')
        plt.show()

        return filtered_unused_loops, possible_circles
def are_approximately_equal(p1, p2, tol=5):
    """
    Check if two points are approximately equal within a given tolerance.

    Args:
        p1 (tuple): The first point as (x, y).
        p2 (tuple): The second point as (x, y).
        tol (float): The tolerance for approximation (default is 5).

    Returns:
        bool: True if the distance between the points is less than the tolerance, False otherwise.
    """
    return np.linalg.norm(np.array(p1) - np.array(p2)) < tol

def compute_slope(p1, p2):
    """
    Compute the slope of the line passing through two points.

    Args:
        p1 (tuple): The first point as (x, y).
        p2 (tuple): The second point as (x, y).

    Returns:
        float: The slope of the line. Returns np.inf if the line is vertical.
    """
    if p2[0] == p1[0]:
        return np.inf
    return (p2[1] - p1[1]) / (p2[0] - p1[0])

class SegmentProcessor:
    def __init__(self, segments, tol=1):
        """
        Initialize the SegmentProcessor.

        Args:
            segments (list): A list of segments where each segment is represented as a tuple of two points ((x1, y1), (x2, y2)).
            tol (float): Tolerance for considering segments as collinear (default is 1).
        """
        self.segments = segments
        self.tol = tol
        self.merged_segments = []
        self.map = {}
        self.common_vertex_segments = []
        self.filtered_merged_segments = []

    def merge_collinear_segments(self):
        """
        Merge collinear segments into single segments based on proximity and slope similarity.
        """
        merged_segments = []
        used = set()
        segment_map = {}

        while len(used) < len(self.segments):
            for i, (start1, end1) in enumerate(self.segments):
                if i not in used:
                    break

            collinear_group = [(start1, end1)]
            used.add(i)

            while True:
                merged = False
                for j, (start2, end2) in enumerate(self.segments):
                    if j in used:
                        continue

                    if (np.abs(compute_slope(start1, end1) - compute_slope(start2, end2)) < self.tol):
                        if any(are_approximately_equal(start, start2) or
                               are_approximately_equal(start, end2) or
                               are_approximately_equal(end, start2) or
                               are_approximately_equal(end, end2) for start, end in collinear_group):
                            collinear_group.append((start2, end2))
                            used.add(j)
                            merged = True

                if not merged:
                    break

            all_points = np.array([point for segment in collinear_group for point in segment])
            min_idx = np.argmin(all_points[:, 0])
            max_idx = np.argmax(all_points[:, 0])
            min_y_idx = np.argmin(all_points[:, 1])
            max_y_idx = np.argmax(all_points[:, 1])

            if np.abs(compute_slope(start1, end1)) < self.tol:
                merged_segments.append((tuple(all_points[min_idx]), tuple(all_points[max_idx])))
                segment_map[(tuple(all_points[min_idx]), tuple(all_points[max_idx]))] = collinear_group
            else:
                segment_map[(tuple(all_points[min_y_idx]), tuple(all_points[max_y_idx]))] = collinear_group
                merged_segments.append((tuple(all_points[min_y_idx]), tuple(all_points[max_y_idx])))

        self.merged_segments = merged_segments
        self.map = segment_map

    def find_segments_with_common_vertices(self):
        """
        Identify segments from the merged segments that share common vertices.

        Returns:
            list: A list of segments that have common vertices.
        """
        common_vertex_segments = []
        for i, (start1, end1) in enumerate(self.merged_segments):
            for j, (start2, end2) in enumerate(self.merged_segments):
                if i != j:
                    if are_approximately_equal(start1, start2, self.tol) or are_approximately_equal(start1, end2, self.tol) or \
                       are_approximately_equal(end1, start2, self.tol) or are_approximately_equal(end1, end2, self.tol):
                        common_vertex_segments.append((start1, end1))
                        break
        self.common_vertex_segments = common_vertex_segments

    def revert_to_original_segments(self):
        """
        Revert the merged segments back to their original segments.

        Returns:
            list: A list of original segments corresponding to the common vertex segments.
        """
        reverted_segments = []
        for segment in self.common_vertex_segments:
            reverted_segments += self.map[segment]
        return reverted_segments

    def filter_merged_segments(self):
        """
        Filter out the merged segments that are also in the list of common vertex segments.
        """
        self.filtered_merged_segments = [seg for seg in self.merged_segments if seg not in self.common_vertex_segments]

    def plot_segments(self, segments, title, highlight_segments=None):
        """
        Plot segments with an optional highlight for specific segments.

        Args:
            segments (list): A list of segments where each segment is represented as a tuple of two points ((x1, y1), (x2, y2)).
            title (str): Title of the plot.
            highlight_segments (list, optional): Segments to be highlighted in a different color (default is None).
        """
        plt.figure(figsize=(10, 8))
        for (start, end) in segments:
            plt.plot([start[0], end[0]], [start[1], end[1]], marker='o', color='blue')
        if highlight_segments:
            for (start, end) in highlight_segments:
                plt.plot([start[0], end[0]], [start[1], end[1]], marker='o', color='red')
        plt.title(title)
        plt.xlabel('X')
        plt.ylabel('Y')
        plt.grid(True)
        plt.show()

class PolygonDetection:
    def __init__(self, error_threshold=150):
        self.error_threshold = error_threshold
        self.polygons = []

    def sample_points_along_segment(self, p1, p2, num_points=10):
        return np.linspace(p1, p2, num_points)

    def calculate_angle_between_lines(self, line1, line2):
        def vector_from_line(line):
            (x1, y1), (x2, y2) = line
            return (x2 - x1, y2 - y1)

        common_points = set(line1) & set(line2)
        if len(common_points) == 0:
            return None

        vec1 = vector_from_line(line1)
        vec2 = vector_from_line(line2)

        magnitude1 = math.sqrt(vec1[0]**2 + vec1[1]**2)
        magnitude2 = math.sqrt(vec2[0]**2 + vec2[1]**2)

        if magnitude1 == 0 or magnitude2 == 0:
            return None

        dot_product = vec1[0] * vec2[0] + vec1[1] * vec2[1]
        cos_theta = dot_product / (magnitude1 * magnitude2)

        cos_theta = min(1, max(-1, cos_theta))

        angle = math.degrees(math.acos(cos_theta))
        return angle

    def are_points_close(self, p1, p2, tolerance=1):
        return np.linalg.norm(np.array(p1) - np.array(p2)) < tolerance

    def calculate_area_contribution(self, p1, p2, p3):
        """Calculate the signed area of the triangle formed by p1, p2, p3."""
        return 0.5 * abs(p1[0] * (p2[1] - p3[1]) + p2[0] * (p3[1] - p1[1]) + p3[0] * (p1[1] - p2[1]))

    def calculate_internal_angle(self, p1, p2, p3):
        vec1 = np.array(p2) - np.array(p1)
        vec2 = np.array(p3) - np.array(p2)
        dot_product = np.dot(vec1, vec2)
        magnitude1 = np.linalg.norm(vec1)
        magnitude2 = np.linalg.norm(vec2)
        if magnitude1 == 0 or magnitude2 == 0:
            return 0
        cos_theta = dot_product / (magnitude1 * magnitude2)
        cos_theta = min(1, max(-1, cos_theta))
        return math.degrees(math.acos(cos_theta))

    def process_polygons(self, polygons):
        vertices_arr = []
        lines_arr = []

        for points in polygons:
            lines = [(points[i], points[(i + 1) % len(points)]) for i in range(len(points))]

            concave_vertices = []
            for i in range(len(points)):
                p_prev = points[i - 1]
                p_curr = points[i]
                p_next = points[(i + 1) % len(points)]
                angle = self.calculate_internal_angle(p_prev, p_curr, p_next)
                if angle > 180:
                    concave_vertices.append(p_curr)

            points = [p for p in points if p not in concave_vertices]

            points = self.filter_points(np.array(points))
            heap = []
            for i in range(len(points)):
                p_prev = points[i - 1]
                p_curr = points[i]
                p_next = points[(i + 1) % len(points)]
                area_contribution = self.calculate_area_contribution(p_prev, p_curr, p_next)
                heapq.heappush(heap, (-area_contribution, p_curr))

            vertices = set()
            while heap:
                score, vertex = heapq.heappop(heap)
                vertex_tuple = tuple(vertex)  # Convert numpy array to a tuple
                if not any(self.are_points_close(vertex, np.array(v)) for v in vertices):
                    vertices.add(vertex_tuple)

            vertices = np.array([np.array(v) for v in vertices])
            vertices_arr.append(vertices)
            lines_arr.append(lines)
        return vertices_arr, lines_arr

    def calculate_distance(self, p1, p2):
        """Calculate the Euclidean distance between two points."""
        return np.linalg.norm(p2 - p1)

    def filter_points(self, points):
        distances = [self.calculate_distance(points[i], points[(i+1) % len(points)]) for i in range(len(points))]
        avg_distance = np.mean(distances)
        threshold = 0.85 * avg_distance
        i = 0
        while i < len(points):
            if distances[i] < threshold:
                dist_prev = self.calculate_distance(points[(i-1 + len(points)) % len(points)], points[i])
                dist_next = self.calculate_distance(points[(i+1) % len(points)], points[(i+2) % len(points)])

                if dist_prev <= dist_next:
                    points = np.delete(points, i, axis=0)
                else:
                    points = np.delete(points, (i+1) % len(points), axis=0)

                distances = [self.calculate_distance(points[j], points[(j+1) % len(points)]) for j in range(len(points))]
            else:
                i += 1

        return points

    def calculate_angle(self, point, centroid):
        return np.arctan2(point[1] - centroid[1], point[0] - centroid[0])

    def get_best_fit_polygon(self, vertices, lines):
        centroid = np.mean(vertices, axis=0)
        distances = np.linalg.norm(vertices - centroid, axis=1)
        average_radius = np.mean(distances)
        n_vertices = len(vertices)

        def generate_regular_polygon(centroid, radius, n_vertices, rotation_angle=0):
            angles = np.linspace(0, 2 * np.pi, n_vertices, endpoint=False) + rotation_angle
            return np.array([
                [centroid[0] + radius * np.cos(angle), centroid[1] + radius * np.sin(angle)]
                for angle in angles
            ])

        def fit_score(vertices, approx_vertices):
            return np.sum(cdist(vertices, approx_vertices, 'euclidean').min(axis=1))

        def line_fit_score(lines, approx_vertices):
            total_distance = 0
            total_samples = 0

            for line in lines:
                p1, p2 = line
                segment_points = self.sample_points_along_segment(p1, p2)
                distances = cdist(segment_points, approx_vertices, 'euclidean').min(axis=1)
                total_distance += np.sum(distances)
                total_samples += len(distances)

            return total_distance / total_samples

        best_fit_polygon = None
        best_fit_score = float('inf')
        best_rotation_angle = 0
        best_radius = average_radius

        radii = np.linspace(average_radius - 1, average_radius + 1, 3)
        for radius in radii:
            for angle in np.linspace(0, 2 * np.pi, 360):
                approx_vertices = generate_regular_polygon(centroid, radius, n_vertices, rotation_angle=angle)
                vertex_score = fit_score(vertices, approx_vertices)
                line_score = line_fit_score(lines, approx_vertices)
                score = vertex_score + line_score
                if score < best_fit_score:
                    best_fit_score = score
                    best_fit_polygon = approx_vertices
                    best_rotation_angle = angle
                    best_radius = radius

        return best_fit_polygon, best_rotation_angle, best_radius

    def get_best_fit_rectangle(self, vertices, lines):
        if len(vertices) != 4:
            return None, None, None
        side_lengths = np.array([np.linalg.norm(vertices[i] - vertices[(i+1) % 4]) for i in range(4)])

        if not (np.isclose(side_lengths[0], side_lengths[2], rtol=0.1) and np.isclose(side_lengths[1], side_lengths[3], rtol=0.1)):
            return None, None, None

        min_adjacent_ratio = np.min(side_lengths) / np.max(side_lengths)
        if min_adjacent_ratio > 0.5:
            return None, None, None

        centroid = np.mean(vertices, axis=0)

        best_rotation_angle = 0  # Placeholder for rotation calculation

        rectangle_vertices = np.array([
            centroid + np.array([-side_lengths[0] / 2, -side_lengths[1] / 2]),
            centroid + np.array([side_lengths[0] / 2, -side_lengths[1] / 2]),
            centroid + np.array([side_lengths[0] / 2, side_lengths[1] / 2]),
            centroid + np.array([-side_lengths[0] / 2, side_lengths[1] / 2])
        ])

        return rectangle_vertices, best_rotation_angle, None

    def get_best_fit_star_shape(self, vertices, lines):
        centroid = np.mean(vertices, axis=0)

        distances = np.linalg.norm(vertices - centroid, axis=1)

        angles = np.arctan2(vertices[:, 1] - centroid[1], vertices[:, 0] - centroid[0])
        sorted_indices = np.argsort(angles)
        sorted_vertices = vertices[sorted_indices]

        outer_vertices = sorted_vertices[::2]
        inner_vertices = sorted_vertices[1::2]

        star_points = np.empty((len(vertices), 2))
        star_points[::2] = outer_vertices
        star_points[1::2] = inner_vertices

        best_rotation_angle = 0
        best_radius = np.mean(distances[sorted_indices[::2]])
        return star_points, best_rotation_angle, best_radius


    def process_polygons_with_fit(self, vertices_list, lines_list):
        valid_polygons = []
        rejected_polygons = []
        remaining_segments = []

        for vertices, lines in zip(vertices_list, lines_list):
            best_fit_polygon, best_rotation_angle, best_radius = None, None, None
            if len(vertices) == 0 or len(lines) == 0:
                continue

            polygon_type = "polygon"

            if len(vertices) % 2 == 0 and len(vertices) >= 8:
                best_fit_polygon, best_rotation_angle, best_radius = self.get_best_fit_star_shape(vertices, lines)
                if best_fit_polygon is None:
                    best_fit_polygon, best_rotation_angle, best_radius = self.get_best_fit_polygon(vertices, lines)
                else:
                    polygon_type = "star"

            elif len(vertices) == 4:
                best_fit_polygon, best_rotation_angle, _ = self.get_best_fit_rectangle(vertices, lines)
                if best_fit_polygon is not None:
                    polygon_type = "rectangle"
                else:
                    best_fit_polygon, best_rotation_angle, best_radius = self.get_best_fit_polygon(vertices, lines)

            else:
                best_fit_polygon, best_rotation_angle, best_radius = self.get_best_fit_polygon(vertices, lines)

            line_errors = []
            for line in lines:
                p1, p2 = line
                segment_points = self.sample_points_along_segment(p1, p2)
                distances = cdist(segment_points, best_fit_polygon, 'euclidean').min(axis=1)
                line_errors.append(np.mean(distances))

            if any(error > self.error_threshold for error in line_errors):
                rejected_polygons.append((vertices, lines))
                for line in lines:
                    remaining_segments.append(line)
                continue

            # Store the valid polygon with its type
            valid_polygons.append((best_fit_polygon, best_rotation_angle, best_radius, polygon_type))

        self.polygons = valid_polygons  # Store the valid polygons
        return valid_polygons, rejected_polygons, remaining_segments

    def plot_all_polygons_with_symmetry(self):
        """
        Plot all the stored polygons along with their lines of symmetry.
        """
        for polygon_data in self.polygons:
            polygon_vertices, rotation_angle, radius, polygon_type = polygon_data
            self.plot_lines_of_symmetry(polygon_vertices, polygon_type=polygon_type)

    def plot_lines_of_symmetry(self, polygon_vertices, polygon_type="polygon"):
        """
        Plot lines of symmetry for regular polygons and rectangles.

        :param polygon_vertices: Array of vertices for the polygon/rectangle.
        :param polygon_type: Type of polygon, either "polygon" or "rectangle".
        """
        centroid = np.mean(polygon_vertices, axis=0)

        plt.figure(figsize=(6, 6))
        plt.plot(*polygon_vertices.T, 'r-', label='Polygon')
        plt.plot([polygon_vertices[-1, 0], polygon_vertices[0, 0]],
                [polygon_vertices[-1, 1], polygon_vertices[0, 1]], 'r-')

        plt.plot(centroid[0], centroid[1], 'ro', label='Centroid')

        if polygon_type == "polygon" or polygon_type == "star":
            for vertex in polygon_vertices:
                plt.plot([vertex[0], centroid[0]], [vertex[1], centroid[1]], 'g--', label='Line of Symmetry')

            if len(polygon_vertices) % 2 == 0 and polygon_type == "polygon":
                num_vertices = len(polygon_vertices)
                for i in range(num_vertices // 2):
                    opposite_vertex = polygon_vertices[(i + num_vertices // 2) % num_vertices]
                    plt.plot([polygon_vertices[i][0], opposite_vertex[0]],
                            [polygon_vertices[i][1], opposite_vertex[1]], 'b--', label='Bisecting Line')

                for i in range(num_vertices):
                    next_i = (i + 1) % num_vertices
                    midpoint = (polygon_vertices[i] + polygon_vertices[next_i]) / 2
                    opposite_midpoint = (polygon_vertices[(i + num_vertices // 2) % num_vertices] +
                                        polygon_vertices[(next_i + num_vertices // 2) % num_vertices]) / 2
                    plt.plot([midpoint[0], opposite_midpoint[0]], [midpoint[1], opposite_midpoint[1]], 'r--', label='Perpendicular Bisector')

        elif polygon_type == "rectangle":
            diagonals = [
                (polygon_vertices[0], polygon_vertices[2]),
                (polygon_vertices[1], polygon_vertices[3])
            ]
            for diagonal in diagonals:
                plt.plot([diagonal[0][0], diagonal[1][0]], [diagonal[0][1], diagonal[1][1]], 'g--', label='Diagonal')

            for i in range(2):
                midpoint = (polygon_vertices[i] + polygon_vertices[(i+2) % 4]) / 2
                plt.plot([midpoint[0], centroid[0]], [midpoint[1], centroid[1]], 'b--', label='Midline')

        plt.axis('equal')
        plt.legend()
        plt.title('Lines of Symmetry')
        plt.show()


    def handle_remaining_segments(self, remaining_segments):
        heapq.heapify(remaining_segments)
        final_polygons = []
        utilized_segments = set()

        while remaining_segments:
            current_segment = heapq.heappop(remaining_segments)
            if any(tuple(map(tuple, segment)) in utilized_segments for segment in current_segment):
                continue

            remaining_polygons = [segment for segment in current_segment if tuple(map(tuple, segment)) not in utilized_segments]

            if len(remaining_polygons) == 0:
                continue

            vertices = np.array([point for segment in remaining_polygons for point in segment])
            lines = remaining_polygons
            best_fit_polygon, best_rotation_angle, best_radius = self.get_best_fit_polygon(vertices, lines)

            line_errors = []
            for line in lines:
                p1, p2 = line
                segment_points = self.sample_points_along_segment(p1, p2)
                distances = cdist(segment_points, best_fit_polygon, 'euclidean').min(axis=1)
                line_errors.append(np.mean(distances))

            if any(error > self.error_threshold for error in line_errors):
                for line in lines:
                    remaining_segments.append(line)
                continue

            final_polygons.append((best_fit_polygon, best_rotation_angle, best_radius))
            for segment in lines:
                utilized_segments.add(tuple(map(tuple, segment)))

        return final_polygons
    
def regularize(path, xlim=None, ylim=None):
    csv_processor = CSVProcessor(csv_file=path)
    csv_processor.load_points_from_csv()

    curves = defaultdict(list)
    for point in csv_processor.all_points:
        curve_index, _, x, y = point
        curves[curve_index].append((x, y))

    curve_processor = CurveProcessor(curves)
    curve_processor.process()
    curves = curve_processor.segment_points_dict

    cycle_detector = CycleDetector(curve_processor.updated_curves)
    cycles, non_cycle_lines = cycle_detector.process_cycles()

    circle_detector = CircleDetector(cycles)
    print("\ntry to fit circle in loops : \n")
    remaining_sides = circle_detector.remaining_sides
    filtered_unused_loops, possible_circles = circle_detector.detect_circles()


    unique_cycles = circle_detector.unique_cycles

    for loop in filtered_unused_loops:
        for polygon in unique_cycles:
            for i in range(len(polygon)):
                side = tuple(sorted([tuple(polygon[i]), tuple(polygon[(i + 1) % len(polygon)])]))
                remaining_sides.add(side)

    # Remove sides in possible_circles
    for _, _, polygon in possible_circles:
        for i in range(len(polygon)):
            side = tuple(sorted([tuple(polygon[i]), tuple(polygon[(i + 1) % len(polygon)])]))
            if side in remaining_sides:
                remaining_sides.remove(side)

    # Remove sides in filtered_unused_loops
    for polygon in filtered_unused_loops:
        for i in range(len(polygon)):
            side = tuple(sorted([tuple(polygon[i]), tuple(polygon[(i + 1) % len(polygon)])]))
            if side in remaining_sides:
                remaining_sides.remove(side)

    segments = list(non_cycle_lines)

    segment_processor = SegmentProcessor(segments)
    segment_processor.merge_collinear_segments()
    segment_processor.find_segments_with_common_vertices()
    rem = segment_processor.revert_to_original_segments()
    segment_processor.filter_merged_segments()

    segment_processor.plot_segments(segment_processor.filtered_merged_segments, "Merged Segments Excluding Common Vertices")
    segment_processor.plot_segments(rem, "Original Segments with Common Vertices")
    remaining_sides = remaining_sides.union(set(rem))
    polygon_detection = PolygonDetection()
    vertices_arr, lines_arr = polygon_detection.process_polygons(filtered_unused_loops)
    if xlim!=None and ylim!= None:
            plt.xlim(-50, ylim)
            plt.ylim(-50, ylim)
    if len(vertices_arr) > 0 or len(lines_arr) > 0 or len(filtered_unused_loops) > 0 :
        print("Impact Points in current loop are : ")
        plt.figure(figsize=(10, 10))
        for vertices in vertices_arr:
            if len(vertices) > 0:
                plt.plot(vertices[:, 0], vertices[:, 1], 'o', label='Processed Vertices')

        for lines in lines_arr:
            for line in lines:
                x_values, y_values = zip(*line)
                plt.plot(x_values, y_values, 'k--', alpha=0.5)

        for points in filtered_unused_loops:
            plt.plot([p[0] for p in points], [p[1] for p in points], 'x--', label='Original Points')

        plt.xlabel('X')
        plt.ylabel('Y')
        plt.title('Impact Points')
        plt.legend()
        plt.grid(True)
        plt.show()

    valid_polygons, rejected_polygons, remaining_segments = polygon_detection.process_polygons_with_fit(vertices_arr, lines_arr)
    polygon_detection.plot_all_polygons_with_symmetry()
    final_polygons = polygon_detection.handle_remaining_segments(remaining_segments)

    if len(valid_polygons) > 0 or len(final_polygons) > 0 :
        plt.figure(figsize=(10, 10))
        for best_fit_polygon, best_rotation_angle, best_radius, polygon_type in valid_polygons:
            plt.plot(np.append(best_fit_polygon[:, 0], best_fit_polygon[0, 0]),
                    np.append(best_fit_polygon[:, 1], best_fit_polygon[0, 1]), 'ro-', label='Best Fit Polygon')

        for best_fit_polygon, best_rotation_angle, best_radius in final_polygons:
            plt.plot(np.append(best_fit_polygon[:, 0], best_fit_polygon[0, 0]),
                    np.append(best_fit_polygon[:, 1], best_fit_polygon[0, 1]), 'go-', label='Final Polygon')

        if xlim!=None and ylim!= None:
            plt.xlim(-50, ylim)
            plt.ylim(-50, ylim)
        plt.legend()
        plt.xlabel('X')
        plt.ylabel('Y')
        plt.title('Approximated Polygons')
        plt.grid(True)
        plt.show()


    def plot_all(valid_polygons, possible_circles, remaining_sides, curves, inverse_dict, merged_segments):
        plt.figure(figsize=(12, 12))
        remaining_sides = set([
            ((float(x1), float(y1)), (float(x2), float(y2)))
            for ((x1, y1), (x2, y2)) in remaining_sides
        ])

        all_x = []
        all_y = []

        for best_fit_polygon, best_rotation_angle, best_radius, polygon_type in valid_polygons:
            all_x.extend(best_fit_polygon[:, 0])
            all_y.extend(best_fit_polygon[:, 1])
            plt.plot(np.append(best_fit_polygon[:, 0], best_fit_polygon[0, 0]),
                    np.append(best_fit_polygon[:, 1], best_fit_polygon[0, 1]), 'ro-', label='Best Fit Polygon')

        for center, radius, circle_points in possible_circles:
            circle = plt.Circle(center, radius, color='b', fill=False)
            plt.gca().add_artist(circle)
            all_x.append(center[0] + radius)
            all_x.append(center[0] - radius)
            all_y.append(center[1] + radius)
            all_y.append(center[1] - radius)
            circle_points = np.array(circle_points)
            all_x.extend(circle_points[:, 0])
            all_y.extend(circle_points[:, 1])

        plotted_curves = set()

        for side in remaining_sides:
            if side in inverse_dict:
                curve_num = inverse_dict[side]
            elif (side[1], side[0]) in inverse_dict:
                curve_num = inverse_dict[(side[1], side[0])]
            else:
                continue

            if curve_num not in plotted_curves:
                if curve_num in curves:
                    points = curves[curve_num]
                    x_values, y_values = zip(*points)
                    all_x.extend(x_values)
                    all_y.extend(y_values)
                    plt.plot(x_values, y_values, label=f'Curve {curve_num}')
                    plotted_curves.add(curve_num)



        for segment in merged_segments:
            (x1, y1), (x2, y2) = segment
            all_x.extend([x1, x2])
            all_y.extend([y1, y2])
            plt.plot([x1, x2], [y1, y2], 'g-', label='Merged Segment')

        if xlim!=None and ylim!= None:
            plt.xlim(-50, ylim)
            plt.ylim(-50, ylim)
        plt.legend()
        plt.xlabel('X')
        plt.ylabel('Y')
        plt.title('Regularized Shapes')
        plt.grid(True)
        plt.show()

    if xlim!=None and ylim!= None:
            plt.xlim(-50, ylim)
            plt.ylim(-50, ylim)
    plot_all(valid_polygons, possible_circles, remaining_sides, curves, curve_processor.inverse_dict, segment_processor.filtered_merged_segments)

regularize("problems/isolated.csv")


explain this code in very veyr very detail like what does every single line do so please do it
how does it find if there's a circl, if there's a square and there's a star everything ok