"""
Post query interface
"""

import re

from sqlalchemy import select, func

from amanuensis.db import DbContext, Post
from amanuensis.errors import ArgumentError

def create(
    db: DbContext,
    lexicon_id: int,
    user_id: int,
    body: str) -> Post:
    """
    Create a new post
    """

    # Verify lexicon id
    if not isinstance(lexicon_id, int):
        raise ArgumentError('Lexicon id must be an integer.')
    
    # Verify user_id
    if not (isinstance(user_id, int) or user_id is None):
        raise ArgumentError('User id must be an integer.')

    # Verify body
    if not isinstance(body, str):
        raise ArgumentError('Post body must be a string.')
    if not body.strip():
        raise ArgumentError('Post body cannot be empty.')

    new_post = Post(
        lexicon_id=lexicon_id,
        user_id=user_id,
        body=body
    )
    db.session.add(new_post)
    db.session.commit()
    return new_post