from logging.config import fileConfig
import os

from alembic import context
from sqlalchemy import engine_from_config, pool

from app.database import Base
from app.models.block_config import BlockConfig
from app.models.template import Template
from app.models.template_block import TemplateBlock


config = context.config

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

target_metadata = Base.metadata


def get_database_url() -> str:
    db_host = os.getenv("DB_HOST", "localhost")
    db_port = os.getenv("DB_PORT", "3306")
    db_user = os.getenv("DB_USER", "root")
    db_pass = os.getenv("DB_PASS", "root123")
    db_name = os.getenv("DB_NAME", "ai_doc_template")
    return f"mysql+pymysql://{db_user}:{db_pass}@{db_host}:{db_port}/{db_name}?charset=utf8mb4"


config.set_main_option("sqlalchemy.url", get_database_url())


def run_migrations_offline() -> None:
    context.configure(
        url=get_database_url(),
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    connectable = engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        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()