import psycopg2
from psycopg2 import sql
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
from argon2 import PasswordHasher
import secrets

def logEvent(action, details, user_id, user_ip, user_agent, dbuser, dbpass, dbhost, dbname):
    try:
        conn = psycopg2.connect(
            host=dbhost,
            user=dbuser,
            password=dbpass,
            database=dbname
        )
        cur = conn.cursor()
        
        cur.execute("""
            INSERT INTO logs (action, details, user_id, user_ip, user_agent)
            VALUES (%s, %s, %s, %s, %s)
        """, (action, details, user_id, user_ip, user_agent))
        
        conn.commit()
        
        cur.close()
        conn.close()
        
    except Exception as e:
        print(f"Error logging event: {e}")
        raise

def createGroup(name, parent, dbuser, dbpass, dbhost, dbname):
    try:
        conn = psycopg2.connect(
            host=dbhost,
            user=dbuser,
            password=dbpass,
            database=dbname
        )
        cur = conn.cursor()
        
        if parent:
            cur.execute("SELECT id FROM groups WHERE name = %s", (parent,))
            parent_record = cur.fetchone()
            if parent_record:
                parent_id = parent_record[0]
            else:
                parent_id = None
        else:
            parent_id = None

        cur.execute("""
            INSERT INTO groups (name, parent)
            VALUES (%s, %s) RETURNING id
        """, (name, parent_id))
        
        group_id = cur.fetchone()[0]
        conn.commit()
        
        cur.close()
        conn.close()
        
        return group_id
        
    except Exception as e:
        print(f"Error creating group: {e}")
        raise

def getGroupByName(name, dbuser, dbpass, dbhost, dbname):
    try:
        conn = psycopg2.connect(
            host=dbhost,
            user=dbuser,
            password=dbpass,
            database=dbname
        )
        cur = conn.cursor()
        
        cur.execute("SELECT id, name, parent, creation_date FROM groups WHERE name = %s", (name,))
        group_record = cur.fetchone()
        
        cur.close()
        conn.close()
        
        if group_record:
            return {
                "id": group_record[0],
                "name": group_record[1],
                "parent": group_record[2],
                "creation_date": group_record[3]
            }
        else:
            return None
        
    except Exception as e:
        print(f"Error retrieving group: {e}")
        raise

def createUser(name, username, email, password, group, dbuser, dbpass, dbhost, dbname):
    try:
        conn = psycopg2.connect(
            host=dbhost,
            user=dbuser,
            password=dbpass,
            database=dbname
        )
        cur = conn.cursor()
        
        password_hash = PasswordHasher().hash(password)

        cur.execute("""
            INSERT INTO users (name, username, email, password_hash, group_id)
            VALUES (%s, %s, %s, %s, %s) RETURNING id
        """, (name, username, email, password_hash, group))
        
        user_id = cur.fetchone()[0]
        conn.commit()
        
        cur.close()
        conn.close()
        
        return user_id
        
    except Exception as e:
        print(f"Error creating user: {e}")
        raise

def createToken(user_id, dbuser, dbpass, dbhost, dbname):
    try:
        conn = psycopg2.connect(
            host=dbhost,
            user=dbuser,
            password=dbpass,
            database=dbname
        )
        cur = conn.cursor()
        # generate a secure random token id (URL-safe)
        token_id = secrets.token_urlsafe(32)

        cur.execute("""
            INSERT INTO userTokens (id, owner_id)
            VALUES (%s, %s) RETURNING id, creation_date, expiration_date
        """, (token_id, user_id))

        token_data = cur.fetchone()
        conn.commit()

        cur.close()
        conn.close()

        return token_data[0]
        
    except Exception as e:
        print(f"Error creating token: {e}")
        raise

def loginUser(username, password, dbuser, dbpass, dbhost, dbname):
    try:
        conn = psycopg2.connect(
            host=dbhost,
            user=dbuser,
            password=dbpass,
            database=dbname
        )
        cur = conn.cursor()
        
        cur.execute("SELECT id, password_hash FROM users WHERE username = %s", (username,))
        user_record = cur.fetchone()
        
        cur.close()
        conn.close()
        
        if user_record:
            user_id, password_hash = user_record
            ph = PasswordHasher()
            try:
                ph.verify(password_hash, password)
                return createToken(user_id, dbuser, dbpass, dbhost, dbname)
            except:
                return None
        else:
            return None
        
    except Exception as e:
        print(f"Error logging in user: {e}")
        raise

def removeToken(token_id, dbuser, dbpass, dbhost, dbname):
    try:
        conn = psycopg2.connect(
            host=dbhost,
            user=dbuser,
            password=dbpass,
            database=dbname
        )
        cur = conn.cursor()
        
        cur.execute("DELETE FROM userTokens WHERE id = %s", (token_id,))
        conn.commit()
        
        cur.close()
        conn.close()
        
        return True
        
    except Exception as e:
        print(f"Error removing token: {e}")
        return False
    
def verifyToken(token_id, dbuser, dbpass, dbhost, dbname):
    try:
        conn = psycopg2.connect(
            host=dbhost,
            user=dbuser,
            password=dbpass,
            database=dbname
        )
        cur = conn.cursor()
        
        cur.execute("""
            SELECT owner_id FROM userTokens
            WHERE id = %s AND expiration_date > CURRENT_TIMESTAMP
        """, (token_id,))
        
        token_record = cur.fetchone()
        
        cur.close()
        conn.close()
        
        if token_record:
            return token_record[0]
        else:
            return None
        
    except Exception as e:
        print(f"Error verifying token: {e}")
        return None