#!/usr/bin/env python3
"""
This script takes multiple .log data files from PCScreenWatcher and a Firefox history database (places.sqlite)
inside a folder to extract each activity title, their url if applicable and usage timestamps into a pseudo-csv file.
"""

import csv
import os
import re
from datetime import datetime
from pathlib import Path

from read_sqlite import get_url_from_sqlite


# takes the log data string and returns a list of activity titles and their time windows
def extract_activities(log_data):
    BROWSER_TITLE_SUFFIX = " - Mozilla Firefox"
    # regex which matches between squared brackets
    reg_titles = re.compile("(?<=\[).*?(?=\])")
    # regex for total/active time
    reg_time = re.compile(
        "(?<!\()Total: \d*\.*\d*m*\d*\.*\d*s*, Active: \d*\.*\d*m*\d*\.*\d*s*"
    )
    # regex which matches number + . and splits into different strings
    reg_split = re.compile("\d+\. ")

    extracted_data = {}
    for log_date in log_data:
        windows = reg_split.split(log_date)
        brackets = []

        del_flag = True
        # extract squared brackets per string
        for s in windows:
            if not del_flag:
                found_brackets = reg_titles.findall(s)
                if found_brackets:
                    # Only use Browser titles
                    if found_brackets[0].endswith(BROWSER_TITLE_SUFFIX):
                        title = found_brackets[0].replace(BROWSER_TITLE_SUFFIX, "")
                        brackets.append(title)
                        enter_exit = s.split("Enter-Exit: ")[-1]
                        timestamps = reg_titles.findall(enter_exit)
                        for timestamp in timestamps:
                            t_enter, t_exit = timestamp.split("-")
                            if not title in extracted_data:
                                extracted_data[title] = []
                            enter_date = datetime.strptime(t_enter, "%H:%M:%S").time()
                            exit_date = datetime.strptime(t_exit, "%H:%M:%S").time()
                            extracted_data[title].append((enter_date, exit_date))
            if "Activies in each window" in s:
                del_flag = False
            if "Restricted Windows Summary:" in s:
                del_flag = True

    return extracted_data


def get_log_data(data_path):
    files = os.listdir(data_path)
    log_files = []
    log_data = []
    for s in files:
        if s.endswith(".log"):
            log_files.append(os.path.join(data_path, s))
    for l in log_files:
        with open(l, "r") as reader:
            log_data.append(reader.read())
    return log_data


def get_history_db(data_path):
    files = os.listdir(data_path)
    for s in files:
        if s.endswith(".sqlite"):
            history_db = os.path.join(data_path, s)
            return history_db
    return None


def match_urls(history_db, log):
    for entry in log:
        url = get_url_from_sqlite(history_db, entry[2])
        entry.append(url)
    return log


def generate_log(activities: dict):
    # For each start time in ascending order, make an entry with title and timestamp
    log = []
    while activities:
        first_title = list(activities.keys())[0]
        smallest_start_time = (first_title, 0)
        for title in activities.keys():
            for idx, timestamp in enumerate(activities[title]):
                if (
                    timestamp[0]
                    < activities[smallest_start_time[0]][smallest_start_time[1]][0]
                ):
                    smallest_start_time = (title, idx)
        log.append(
            [
                activities[smallest_start_time[0]][smallest_start_time[1]][
                    0
                ].isoformat(),
                activities[smallest_start_time[0]][smallest_start_time[1]][
                    1
                ].isoformat(),
                smallest_start_time[0],
            ]
        )
        del activities[smallest_start_time[0]][smallest_start_time[1]]
        if not activities[smallest_start_time[0]]:
            del activities[smallest_start_time[0]]
    return log


def write_logfile(vp_dir, log):
    path = Path(f"{vp_dir}/logs.csv")
    with open(path, "w", newline="") as csvfile:
        writer = csv.writer(
            csvfile, delimiter=",", quoting=csv.QUOTE_NONNUMERIC, lineterminator="\n"
        )
        writer.writerow(["Starttime", "Endtime", "Title", "URL"])
        for row in log:
            writer.writerow(row)


def main():
    for vp_dir in [f.name for f in os.scandir() if f.is_dir()]:
        print(vp_dir)
        log = extract_activities(get_log_data(vp_dir))
        log = generate_log(log)

        history = get_history_db(vp_dir)
        log = match_urls(history, log)
        write_logfile(vp_dir, log)


if __name__ == "__main__":
    main()