from io import DEFAULT_BUFFER_SIZE
import os
import time
import json
from psycopg2.sql import NULL
import requests
import psycopg2 as ps

def read_file(path):
    with open(path, "r", encoding="utf-8") as f:
        return f.read()

def getenv(name):
    try:
        return os.environ[name]
    except KeyError:
        print(f"[ERROR] Missing environment variable {name}. You should NOT run this script by hand, please use systemd mastodon-kanidm-sync.service.")
        exit(1)


# Import configuration
KANIDM_URL = getenv("KANIDM_URL")
KANIDM_TOKEN = read_file(getenv("KANIDM_TOKEN_PATH")).strip()
USERDATA = read_file(getenv("USERDATA_FILE_PATH")).strip()

# Fetch configuration from userdata file
# Userdata file is json list with information about what users are configured by kanidm
userdata = json.loads(USERDATA)

# Load database
conn = ps.connect(
    dbname=getenv("POSTGRES_DBNAME"),
    user=getenv("POSTGRES_USER"),
    host=getenv("POSTGRES_HOST")
)

# Fetch current userdata from database
cur = conn.cursor()
cur.execute('''
    SELECT identities.uid, users.id, user_roles.name
    FROM users
    JOIN identities 
      ON users.id = identities.id 
    LEFT JOIN user_roles 
      ON users.role_id = user_roles.id;
    '''
)

state = cur.fetchall()

users = {}
for i in state:
    users[i[0]] = {
        "id": i[1],
        "role": i[2],
        "isKanidmUser": False
    }

# Fetch Kanidm userdata
kanidm_users_raw = requests.get(
    f"{KANIDM_URL}/v1/person",
    headers={
        "Authorization": f"Bearer {KANIDM_TOKEN}",
        "Content-Type": "application/json",
    },
    timeout=5,
).json()

for i in kanidm_users_raw:
    i = i["attrs"]
    for uid in i["name"]: # [user].attrs.name is a list
      if uid in users: # Don't apply anything for users who have no mastodon access (sp.matrix.users) or didn't register
        for group in i["attrs"]["memberof"]:
          if group.startswith("sp.matrix.admins@"):
            if uid not in userdata:
              userdata.append(uid)
            users[uid]["isKanidmUser"] = True
            users[uid]["role"] = "Admin"
            print(f"[INFO] {uid} got role Admin")
            break
          elif group.startswith("sp.matrix.moderators@"):
            if uid not in userdata:
              userdata.append(uid)
            users[uid]["isKanidmUser"] = True
            users[uid]["role"] = "Moderator"
            print(f"[INFO] {uid} got role Moderator")
            break
          elif uid in userdata:
            # If user, who previously had a role, has no roles set by Kanidm, delete them from userdata list so allow setting roles directly by mastodon
            users[uid]["isKanidmUser"] = True
            users[uid]["role"] = None
            userdata.remove(uid)
            print(f"[INFO] {uid} has no roles")

print("[DEBUG] ", users) # DEBUG

cur.close()
conn.close()

print("[INFO] Final userdata file: ", userdata)
with open(getenv("USERDATA_FILE_PATH"), "w") as f:
  f.write(json.dumps(userdata))