import os
import glob
import json
import re


class SaveData:   
    def search_in_folder(self, folder, file_name = "MPENN_image_data_information.json"):
        """
        Searches for a specific file named "MPENN_image_data_information.json" within a given folder.
        
        :param folder: The folder path to search in.
        :return: A list containing the path to the "MPENN_image_data_information.json" file if found, empty otherwise.
        """
        # Validate input parameters
        if not os.path.isdir(folder):
            raise ValueError("The provided folder path does not exist or is not a directory.")
                
        # Construct the full search path
        search_path = os.path.join(folder, file_name)

        # Use glob.glob to find the specified file
        matching_file = glob.glob(search_path)
        if len(matching_file) == 0:
            matching_file = self.create(folder)
        return matching_file

    def create(self, folder):
        """
        Create a .json file in the given folder path.
        
        :param folder: Path of the folder where the .json file will be created.
        """
        # Validating folder path
        if not isinstance(folder, str) or not folder:
            raise ValueError("Folder path must be a non-empty string.")
        
        # Ensuring the folder exists
        os.makedirs(folder, exist_ok=True)

        # Generating a JSON file name with a placeholder approach
        file_name = "MPENN_image_data_information.json"
        file_path = os.path.join(folder, file_name)

        # Creating and writing to the JSON file
        try:
            with open(file_path, 'w') as json_file:
                json.dump({}, json_file)  # Creating an empty JSON object
            return file_path
        except OSError as e:
            raise OSError(f"Failed to create file in {folder}. Error: {e}")

    def append_to_json_file(self, image_path, resolution, labeled, rectangles, filename):
        """
        Appends a new record to an existing .json file or creates a file if it doesn't exist.
        
        :param image_path: A string representing the path to the image.
        :param resolution: A list or tuple with two integers representing the image's resolution.
        :param labeled: A boolean indicating if the image is labeled.
        :param rectangles: A list of lists, where each inner list represents rectangle information.
        :param filename: A string representing the name of the output .json file.
        """
        rectangles = self.calculate_missing_coordinates_for_each(rectangles)
        # New entry to add
        
        
        new_entry = {
            "Image_path": image_path,
            "resolution": resolution,
            "labeled": str(labeled),
            "rectangle": rectangles
        }

        try:
            # Try to read the existing file
            with open(filename, 'r') as file:
                # Load the JSON data from the file
                data = json.load(file)
                # Ensure the data is a list to hold multiple entries
                if not isinstance(data, list):
                    data = [data]  # Convert to list if it's a single dictionary
        except FileNotFoundError:
            # If the file doesn't exist, start a new list
            data = []
        
        # Append the new entry
        data.append(new_entry)
        
        # Write the updated list back to the file
        with open(filename, 'w') as file:
            json.dump(data, file, indent=4)
        
    def calculate_missing_coordinates_for_each(self, rectangles):
        """
        Calculate missing coordinates for each rectangle set in
        the provided list of rectangles, considering the new format wherein
        coordinates are provided as a single tuple.

        Args:
        - rectangles (List[List]): Input list containing rectangle identifiers, their coordinates in a single tuple, and other information.
        Example: [[id, (top_left_x, top_left_y, bottom_right_x, bottom_right_y), ...]]

        Returns:
        - List[List]: Updated list with added missing coordinate lists for each rectangle.
        """
        updated_rectangles = []

        for rectangle in rectangles:
            # Assuming the structure is [rectangle_id, (top_left_x, top_left_y, bottom_right_x, bottom_right_y), other_info...]
            rectangle_id, coords, *others = rectangle

            # Unpack coords
            top_left_x, top_left_y, bottom_right_x, bottom_right_y = coords

            # Calculate missing coordinates: top right (x2, y1) and bottom left (x1, y2)
            top_right = (bottom_right_x, top_left_y)
            bottom_left = (top_left_x, bottom_right_y)

            # Ensure the order is [rectangle_id, [top_left], [top_right], [bottom_right], [bottom_left], other_info...]
            top_left = (top_left_x, top_left_y)
            bottom_right = (bottom_right_x, bottom_right_y)

            updated_rectangle = [rectangle_id, top_left, top_right, bottom_right, bottom_left] + others
            updated_rectangles.append(updated_rectangle)

        return updated_rectangles
    
    def find_highest_image_number(self, json_data):
        """
        Search through the provided JSON data for the highest number in the "Image_path".

        Args:
        - j_data (List[Dict]): The input JSON data loaded into a Python data structure.

        Returns:
        - int: The highest number found in the "Image_path"; returns -1 if no numbers are found.
        """
        highest_number = -1
        with open(json_data, 'r') as file:
                # Load the JSON data from the file
                j_data = json.load(file)
                pattern = re.compile(r'\d+')

                for item in j_data:
                    if "Image_path" in item:
                        # Extract numbers from "Image_path"
                        numbers = pattern.findall(item["Image_path"])
                        for number in numbers:
                            # Convert found numbers to integers and track the highest
                            current_number = int(number)
                            if current_number > highest_number:
                                highest_number = current_number
        highest_number+= 1                        
        return highest_number