"""
Couche d'accès à la base de données PostgreSQL.
Utilise psycopg2 directement — pas d'ORM, code lisible et transparent.
"""
import os
import logging
import psycopg2
import psycopg2.extras
from contextlib import contextmanager

logger = logging.getLogger(__name__)


def get_connection():
    database_url = os.environ.get("DATABASE_URL")
    if not database_url:
        raise RuntimeError("DATABASE_URL est requis.")
    return psycopg2.connect(database_url, cursor_factory=psycopg2.extras.RealDictCursor)


@contextmanager
def db_cursor():
    conn = get_connection()
    try:
        with conn.cursor() as cur:
            yield cur
            conn.commit()
    except Exception:
        conn.rollback()
        raise
    finally:
        conn.close()


def init_db():
    """Crée les tables si elles n'existent pas, et applique les migrations nécessaires."""
    with db_cursor() as cur:
        cur.execute("""
            CREATE TABLE IF NOT EXISTS ideas (
                id SERIAL PRIMARY KEY,
                content TEXT NOT NULL,
                author VARCHAR(100),
                accepted BOOLEAN NOT NULL DEFAULT FALSE,
                rejection_reason TEXT,
                legal_basis TEXT,
                created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
            )
        """)
        cur.execute("""
            ALTER TABLE ideas
            ADD COLUMN IF NOT EXISTS legal_basis TEXT
        """)
        cur.execute("""
            CREATE TABLE IF NOT EXISTS synthesis (
                id SERIAL PRIMARY KEY,
                text TEXT NOT NULL,
                idea_count INTEGER NOT NULL DEFAULT 0,
                updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
            )
        """)
    logger.info("Base de données initialisée.")


def insert_idea(content: str, author: str | None, accepted: bool,
                rejection_reason: str | None, legal_basis: str | None) -> dict:
    with db_cursor() as cur:
        cur.execute(
            """
            INSERT INTO ideas (content, author, accepted, rejection_reason, legal_basis)
            VALUES (%s, %s, %s, %s, %s)
            RETURNING *
            """,
            (content, author, accepted, rejection_reason, legal_basis),
        )
        return dict(cur.fetchone())


def get_accepted_ideas() -> list[dict]:
    with db_cursor() as cur:
        cur.execute(
            "SELECT * FROM ideas WHERE accepted = TRUE ORDER BY created_at ASC"
        )
        return [dict(row) for row in cur.fetchall()]


def get_all_ideas(limit: int = 50) -> list[dict]:
    with db_cursor() as cur:
        cur.execute(
            "SELECT * FROM ideas ORDER BY created_at DESC LIMIT %s", (limit,)
        )
        return [dict(row) for row in cur.fetchall()]


def get_stats() -> dict:
    with db_cursor() as cur:
        cur.execute("SELECT COUNT(*) as total FROM ideas")
        total = cur.fetchone()["total"]
        cur.execute("SELECT COUNT(*) as accepted FROM ideas WHERE accepted = TRUE")
        accepted = cur.fetchone()["accepted"]
        cur.execute("SELECT COUNT(*) as rejected FROM ideas WHERE accepted = FALSE")
        rejected = cur.fetchone()["rejected"]
    return {"total": total, "accepted": accepted, "rejected": rejected}


def upsert_synthesis(text: str, idea_count: int) -> dict:
    with db_cursor() as cur:
        cur.execute("SELECT id FROM synthesis LIMIT 1")
        row = cur.fetchone()
        if row:
            cur.execute(
                """
                UPDATE synthesis
                SET text = %s, idea_count = %s, updated_at = NOW()
                WHERE id = %s
                RETURNING *
                """,
                (text, idea_count, row["id"]),
            )
        else:
            cur.execute(
                """
                INSERT INTO synthesis (text, idea_count)
                VALUES (%s, %s)
                RETURNING *
                """,
                (text, idea_count),
            )
        return dict(cur.fetchone())


def get_synthesis() -> dict | None:
    with db_cursor() as cur:
        cur.execute("SELECT * FROM synthesis LIMIT 1")
        row = cur.fetchone()
        return dict(row) if row else None