import argparse
import csv
from collections import defaultdict
import re
from datetime import datetime


def parse_sniffed_packet(csv_data):
    # Regular expression pattern for the timestamp
    pattern = r'("\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}",)'
    # Split the data using the pattern, keeping the delimiters
    entries = re.split(pattern, csv_data)[1:]  # first element is always empty

    parsed_data = {}
    for i in range(0, len(entries), 2):
        timestamp_str = entries[i].strip('",')
        value = entries[i + 1]

        # Parse the timestamp string into a datetime object
        timestamp = datetime.strptime(timestamp_str, "%Y-%m-%d %H:%M:%S")

        if timestamp in parsed_data:
            # Concatenate value if timestamp already exists
            parsed_data[timestamp] += value
        else:
            # Otherwise, just add the new entry
            parsed_data[timestamp] = value

    return parsed_data


def parse_emporia(csv_data):
    parsed_data = {}
    last_value = None

    reader = csv.reader(csv_data.splitlines())
    for row in reader:
        # print(row)
        # Skip blank lines
        if not row or len(row) < 2:
            continue

        timestamp_str, value = row

        # Skip if the value is the same as the last one
        if value == last_value:
            continue

        # Parse the timestamp string into a datetime object
        try:
            timestamp = datetime.strptime(timestamp_str, "%m/%d/%Y %H:%M:%S")
        except ValueError:
            continue

        # Update the last value and add the new entry
        last_value = value
        parsed_data[timestamp] = value

    return parsed_data


def find_nearest_before(from_emporia, sniffed):
    result = []
    for keyA, valueA in from_emporia.items():
        # Initialize nearest datetime and its value
        nearest_time = None
        nearest_value = None
        # Go through each item in sniffed
        for keyB, valueB in sniffed.items():
            # Check if keyB is before keyA and within 1-5 seconds
            if 0 < (keyA - keyB).total_seconds() <= 5:
                # Update nearest_time if it's closer to keyA than the previous nearest_time
                if nearest_time is None or (keyA - keyB) < (keyA - nearest_time):
                    nearest_time = keyB
                    nearest_value = valueB
        # Append to result if a match is found
        if nearest_time:
            result.append((nearest_time, valueA, nearest_value))
    return result


def find_nearest_after(sniffed, from_emporia):
    result = []
    for keyA, valueA in sniffed.items():
        # Initialize nearest datetime and its value
        nearest_time = None
        nearest_value = None
        # Go through each item in dictB
        for keyB, valueB in from_emporia.items():
            # Check if keyB is after keyA and within 1-5 seconds
            if 1 < (keyB - keyA).total_seconds() <= 5:
                # Update nearest_time if it's closer to keyA than the previous nearest_time
                if nearest_time is None or (keyB - keyA) < (nearest_time - keyA):
                    nearest_time = keyB
                    nearest_value = valueB
        # Append to result if a match is found
        if nearest_time:
            result.append((keyA, valueA, nearest_value))
        else:
            print("have time", keyA, "that doesnt have a nearest value")
    return result


def swap_endianness(hex_string):
    # Split the string into bytes (two characters each)
    bytes_list = [hex_string[i : i + 2] for i in range(0, len(hex_string), 2)]
    # Reverse the list of bytes and join them back into a string
    reversed_hex = "".join(reversed(bytes_list))
    return reversed_hex


def hex_to_decimal(hex_string):
    try:
        # First, swap the endianness
        swapped_hex = swap_endianness(hex_string)
        # Then, convert the hexadecimal string to decimal
        return int(swapped_hex, 16)
    except ValueError:
        return "Invalid hexadecimal number"


def read_file(file_path):
    with open(file_path, "r") as file:
        return file.read()


def main():
    parser = argparse.ArgumentParser(description="Merge the data.")
    parser.add_argument(
        "--sniffed_data", required=True, help="Filepath to the sniffed UART traffic."
    )
    parser.add_argument(
        "--emporia_csv", required=True, help="Filepath to the Emporia 1SEC CSV."
    )

    args = parser.parse_args()

    sniffed_data = read_file(args.sniffed_data)
    parsed_sniff = parse_sniffed_packet(sniffed_data)

    emporia_data = read_file(args.emporia_csv)
    parsed_emporia = parse_emporia(emporia_data)

    hex3_to_watts = defaultdict(list)
    result = find_nearest_after(parsed_sniff, parsed_emporia)
    for timestamp, packet, watts in result:
        hex3 = packet[90:96]
        hex3_to_watts[hex3].append((watts, packet))

    for hex3, watts in hex3_to_watts.items():
        print("Hex3:", hex3, "Calculated W:", hex_to_decimal(hex3), "Pairing:", watts)


if __name__ == "__main__":
    main()