import sqlite3
from contextlib import contextmanager
from pathlib import Path
from typing import Iterator

from app.core.config import get_settings


def _ensure_parent_dir(db_path: str) -> None:
    Path(db_path).parent.mkdir(parents=True, exist_ok=True)


def initialize_database() -> None:
    settings = get_settings()
    _ensure_parent_dir(settings.sqlite_path)
    Path(settings.upload_dir).mkdir(parents=True, exist_ok=True)

    with sqlite3.connect(settings.sqlite_path) as connection:
        connection.execute(
            """
            CREATE TABLE IF NOT EXISTS observations (
                id TEXT PRIMARY KEY,
                payload_json TEXT NOT NULL,
                created_at TEXT DEFAULT CURRENT_TIMESTAMP
            )
            """
        )
        connection.execute(
            """
            CREATE TABLE IF NOT EXISTS analysis_sessions (
                session_id TEXT PRIMARY KEY,
                observation_id TEXT NOT NULL,
                status TEXT NOT NULL,
                payload_json TEXT NOT NULL,
                created_at TEXT DEFAULT CURRENT_TIMESTAMP
            )
            """
        )
        connection.commit()


@contextmanager
def get_connection() -> Iterator[sqlite3.Connection]:
    settings = get_settings()
    _ensure_parent_dir(settings.sqlite_path)
    connection = sqlite3.connect(settings.sqlite_path)
    connection.row_factory = sqlite3.Row
    try:
        yield connection
    finally:
        connection.close()