import os
from logging.config import fileConfig
from urllib.parse import urlparse, parse_qs, urlencode, unquote

from sqlalchemy import create_engine, pool

from alembic import context
from src.models import Base

config = context.config

raw_url = os.environ.get("DATABASE_URL", "")
if raw_url:
    # Convert async driver to sync driver
    url = raw_url.replace("postgresql+asyncpg://", "postgresql://")
    url = unquote(url)
    # Strip sslmode (not supported by psycopg2)
    parsed = urlparse(url)
    if parsed.query:
        params = parse_qs(parsed.query)
        params.pop("sslmode", None)
        new_query = urlencode(params, doseq=True)
        url = parsed._replace(query=new_query).geturl()
    config.set_main_option("sqlalchemy.url", url)

if config.config_file_name is not None:
    fileConfig(config.config_file_name)

target_metadata = Base.metadata


def run_migrations_offline() -> None:
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    # Use DATABASE_URL env directly, properly converted for psycopg2
    raw_url = os.environ.get("DATABASE_URL", "")
    url = raw_url.replace("postgresql+asyncpg://", "postgresql://")
    url = unquote(url)
    # Strip sslmode
    parsed = urlparse(url)
    if parsed.query:
        params = parse_qs(parsed.query)
        params.pop("sslmode", None)
        new_query = urlencode(params, doseq=True)
        url = parsed._replace(query=new_query).geturl()

    connectable = create_engine(url, poolclass=pool.NullPool)
    with connectable.connect() as connection:
        context.configure(connection=connection, target_metadata=target_metadata)
        with context.begin_transaction():
            context.run_migrations()


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()