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

if len(sys.argv) > 1:
    time_ago_arg = int(sys.argv[1])
    print(f"Going back in time by {time_ago_arg} days")
else:
    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("start running the log commands");

# 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)
else:
    since_last_boot = False
    device_info = False
    ip_address = False
    time_since_last_boot = False


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("start running the service commands, this sometimes takes longer");
logins_today_log = subprocess.run(["sudo", "journalctl","_COMM=systemd-logind", "-S", "today", "-g", "New session"  ], check=True, capture_output=True)

# journalctl --utc
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)
users_created_today = run_command(["sudo", "journalctl","_COMM=useradd","-r"] + get_journalctl_on()).splitlines()


# TODO: merge into one command and then grep the various _COMM\s, wrap in a function
groupadd_today_log = subprocess.run(["sudo", "journalctl", "-S","today","_COMM=groupadd","-r"], check=True, capture_output=True)
groupremove_today_log = subprocess.run(["sudo", "journalctl", "-S","today","_COMM=groupremove","-r"], check=True, capture_output=True)
usermod_today_log = subprocess.run(["sudo", "journalctl", "-S","today","_COMM=usermod","-r"], check=True, capture_output=True)
userdel_today_log = subprocess.run(["sudo", "journalctl", "-S","today","_COMM=userdel","-r"], check=True, capture_output=True)

kitchen_services = run_command(["sudo", "journalctl", "-S", "today", "-u", "kitchen-stove.service", "-u", "kitchen-bin.service", "-u", "kitchen-fridge.service", "-r", "-n"]).splitlines()

# loading the jinja template environment
print("Filling the template");
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")
fallback = list_package_installs
# 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,
    users_created_today=users_created_today,
    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,
    logins_today = run_command(['grep', '-v', "Boot"], based=logins_today_log.stdout).splitlines(),
    list_active_services = run_command(["sudo", "service", "--status-all"]).splitlines() if not time_ago_arg else False,
    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 = run_command(['grep', '-v', "Boot"], based=groupadd_today_log.stdout).splitlines(),
    groups_removed = run_command(['grep', '-v', "Boot"], based=groupremove_today_log.stdout).splitlines(),
    user_modified = run_command(['grep', '-v', "Boot"], based=usermod_today_log.stdout).splitlines(),
    user_deleted = run_command(['grep', '-v', "Boot"], based=userdel_today_log.stdout).splitlines()
)


print("Output 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)
    # subprocess.run(['sh', '/home/xpub/www/html/tl-dr/create_book.sh', book_name])
    print("Finished");

# At the moment, we are not storing logs in the log folder anymore
# with open(log_file_name, "w") as f:
#     print(output, file=f)