from jinja2 import Environment, FileSystemLoader
import subprocess
from datetime import datetime, timedelta
import os
import sys
import re

if len(sys.argv) > 1:
    time_ago_arg = int(sys.argv[1])
    print(f"Going back in time by {time_ago_arg} days")
else:
    print(f"Creating a book for today")
    time_ago_arg = False

#create the log directory
path = "/home/xpub/www/html/tl-dr/log-books"
if not  os.path.exists(path):
   os.makedirs(path)

if(time_ago_arg):
    now = datetime.today() - timedelta(days=time_ago_arg)
else:
    now = datetime.today()

book_name = "TL;DR_" + now.strftime("%B %dth %Y")

print(f"making a book called {book_name}")

def get_journalctl_on():
    if time_ago_arg:
        return ["-S", f"{time_ago_arg + 1} days ago", "-U",  f"{time_ago_arg} days ago"]    
    else:
        return ["-S","today"]

def create_all_logs_file():
    list_logs = subprocess.run(["ls", "/home/xpub/www/html/tl-dr/log-books"], capture_output=True)

    with open("/home/xpub/www/html/tl-dr/log-books/all.txt", "w") as f:
        print(list_logs.stdout.decode('UTF-8').strip(), file=f)

# Execute a command on the command line. Based = used for piped commands
def run_command(command, based = False):
    result = subprocess.run(command, capture_output=True, input=based)
    result.check_returncode()
    stripped = result.stdout.decode('UTF-8').strip()
    
    if "No entries" in stripped:
        return  ""
    else:
        return stripped


# Run all the commands for getting the logs, and assign to variables
print("Commands: statics")

# These vars cannot go back in time
if not time_ago_arg:
    since_last_boot = run_command(["uptime","-s"])
    slb_date = datetime.strptime(since_last_boot, "%Y-%m-%d %H:%M:%S")
    time_since_last_boot = (now - slb_date).days
    device_info_grab = subprocess.run(["grep", 'Model' , "/proc/cpuinfo"], check=True, capture_output=True)
    device_info = run_command(['awk', '-F:', '{ print $2}'], based=device_info_grab.stdout)
    ip_address_show = subprocess.run(["ip", "addr", "show", "end0"], check=True, capture_output=True)
    ip_address = run_command(['awk', '$1 == "inet" {gsub(/\/.*$/, "", $2); print $2}' ], based=ip_address_show.stdout)
    list_active_services = run_command(["sudo", "service", "--status-all"]).splitlines()
else:
    since_last_boot = False
    device_info = False
    ip_address = False
    time_since_last_boot = False
    list_active_services = False

print("Commands: packages")
dpkg_date = now.strftime("%Y-%m-%d")

list_package_installs = subprocess.run(["grep","-E", dpkg_date + '.*install|install.*' + dpkg_date, "/var/log/dpkg.log"], capture_output=True).stdout.decode('UTF-8').splitlines()
list_package_upgrade = subprocess.run(["grep","-E", dpkg_date + '.*upgrade|upgrade.*' + dpkg_date, "/var/log/dpkg.log"], capture_output=True).stdout.decode('UTF-8').splitlines()
list_package_remove = subprocess.run(["grep","-E", dpkg_date + '.*remove|remove.*' + dpkg_date, "/var/log/dpkg.log"], capture_output=True).stdout.decode('UTF-8').splitlines()

print("Commands: journalctl, this sometimes takes longer");

journal_today = run_command(["sudo", "journalctl","_COMM=useradd", "_COMM=usermod", "_COMM=userdel","_COMM=groupremove", "_COMM=groupadd","-r", "--utc"] + get_journalctl_on()).splitlines()


# TODO this is not working with the time ago. name should be grepped from user_created_today
last_user_added = subprocess.run(["sudo", "journalctl","_COMM=useradd","-r","-n", "1" , "--output-fields=MESSAGE"], capture_output=True)
last_user_added_name = run_command(['grep', '-Po', "(?<=name)\W*\K[^ ]*"], based=last_user_added.stdout)

journal_today = subprocess.run(["sudo", "journalctl","_COMM=systemd-logind","_COMM=useradd", "_COMM=usermod", "_COMM=userdel","_COMM=groupremove", "_COMM=groupadd","-r"] + get_journalctl_on(), check=True, capture_output=True)


def get_last_user(log):
    if log:
        last = log[-1]
        result = re.findall(r"name=([^,]*)", users_created_today[-1]) 
        return result[0]
    else:
        return False
        

try:
    groups_created = subprocess.run(['grep','groupadd'], capture_output=True, input=journal_today.stdout).stdout.decode('UTF-8').strip().splitlines()
    groups_removed = subprocess.run(['grep','groupremove'], capture_output=True, input=journal_today.stdout).stdout.decode('UTF-8').strip().splitlines()
    users_created_today = subprocess.run(['grep','useradd'], capture_output=True, input=journal_today.stdout).stdout.decode('UTF-8').strip().splitlines()
    user_modified = subprocess.run(['grep','usermod'], capture_output=True, input=journal_today.stdout).stdout.decode('UTF-8').strip().splitlines()
    user_deleted = subprocess.run(['grep','userdel'], capture_output=True, input=journal_today.stdout).stdout.decode('UTF-8').strip().splitlines()
    logins_today = subprocess.run(['grep','New session'], capture_output=True, input=journal_today.stdout).stdout.decode('UTF-8').strip().splitlines()
    
    last_user_name = get_last_user(users_created_today)
    
except subprocess.CalledProcessError as e:
    raise RuntimeError("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output))

print("Commands: services, this sometimes takes longer");
kitchen_services = run_command(["sudo", "journalctl", "-u", "kitchen-stove.service", "-u", "kitchen-bin.service", "-u", "kitchen-fridge.service", "-r", "-n"] + get_journalctl_on()).splitlines()

print("Got all commands data");
# loading the jinja template environment
env = Environment(loader=FileSystemLoader("/home/xpub/www/html/tl-dr/templates"))

# loading the template (use template.jinja when generating the html webview)
template = env.get_template("book.jinja")

print("rendering the template")
# rendering the template and storing the resultant text in variable output
output = template.render(
    now = now.strftime("%B %dth %Y"),
    last_user_added=last_user_added.stdout.decode('UTF-8'),
    last_user_added_name=last_user_added_name,
    since_last_boot=since_last_boot,
    list_package_installs=list_package_installs,
    list_package_upgrade=list_package_upgrade,
    list_package_remove=list_package_remove,
    device_info=device_info,
    days_since_last_boot = time_since_last_boot,
    kitchen_services = kitchen_services,
    ip_address = ip_address,
    list_active_services = list_active_services,
    debian_version = run_command(["cat", "/etc/debian_version"]) if not time_ago_arg else False,
    hostname = run_command(["hostname","-i"]) if not time_ago_arg else False,
    groups_created = groups_created,
    groups_removed = groups_removed,
    users_created_today = users_created_today,
    user_modified = user_modified,
    user_deleted = user_deleted,
    logins_today = logins_today,
    last_user_name = last_user_name if not last_user_name else False
)


print("Storing the files");
# Export the html as book.html, which is used as an input for pandoc
with open(f"/home/xpub/www/html/tl-dr/book_{time_ago_arg}.html", "w") as f:
    print(output, file=f)
    if not time_ago_arg:
        subprocess.run(['sh', '/home/xpub/www/html/tl-dr/create_book.sh', book_name])
    else:
        print("i did not create an epub since im an oldie")
    print("Finished");