"""Entry point from spinning up flask"""

import os
import sys
import logging
from pathlib import Path

from typing import Dict
from typing import Union

from flask import Flask
from flask_cors import CORS  # type: ignore

from gn3.loggers import setup_app_handlers
from gn3.api.gemma import gemma
from gn3.api.rqtl import rqtl
from gn3.api.general import general
from gn3.api.heatmaps import heatmaps
from gn3.api.correlation import correlation
from gn3.api.data_entry import data_entry
from gn3.api.wgcna import wgcna
from gn3.api.ctl import ctl
from gn3.errors import register_error_handlers
from gn3.api.async_commands import async_commands
from gn3.api.menu import menu
from gn3.api.search import search
from gn3.api.metadata import metadata
from gn3.api.sampledata import sampledata
from gn3.api.llm import gnqa
from gn3.api.rqtl2 import rqtl2
from gn3.case_attributes import caseattr


class ConfigurationError(Exception):
    """Raised in case of a configuration error."""


def verify_app_config(app: Flask) -> None:
    """Verify that configuration variables are as expected
    It includes:
        1. making sure mandatory settings are defined
        2. provides examples for what to set as config variables (helps local dev)
    """
    app_config = {
        "AUTH_SERVER_URL": """AUTH_SERVER_URL is used for api requests that need login.
        For local dev, use the running auth server url, which defaults to http://127.0.0.1:8081
        """,
    }
    error_message = []

    for setting, err in app_config.items():
        print(f"{setting}: {app.config.get(setting)}")
        if setting in app.config and bool(app.config[setting]):
            continue
        error_message.append(err)
    if error_message:
        raise ConfigurationError("\n".join(error_message))


def create_app(config: Union[Dict, str, None] = None) -> Flask:
    """Create a new flask object"""
    app = Flask(__name__)
    # Load default configuration
    app.config.from_object("gn3.settings")

    # Load environment configuration
    if "GN3_CONF" in os.environ:
        app.config.from_envvar("GN3_CONF")

    # Load app specified configuration
    if config is not None:
        if isinstance(config, dict):
            app.config.update(config)
        elif config.endswith(".py"):
            app.config.from_pyfile(config)

    # BEGIN: SECRETS -- Should be the last of the settings to load
    secrets_file = os.environ.get("GN3_SECRETS")
    if secrets_file and Path(secrets_file).exists():
        app.config.from_envvar("GN3_SECRETS")
    # END: SECRETS
    verify_app_config(app)
    setup_app_handlers(app)
    # DO NOT log anything before this point
    logging.info("Guix Profile: '%s'.", os.environ.get("GUIX_PROFILE"))
    logging.info("Python Executable: '%s'.", sys.executable)

    CORS(
        app,
        origins=app.config["CORS_ORIGINS"],
        allow_headers=app.config["CORS_HEADERS"],
        supports_credentials=True,
        intercept_exceptions=False,
    )

    app.register_blueprint(general, url_prefix="/api/")
    app.register_blueprint(gemma, url_prefix="/api/gemma")
    app.register_blueprint(rqtl, url_prefix="/api/rqtl")
    app.register_blueprint(heatmaps, url_prefix="/api/heatmaps")
    app.register_blueprint(correlation, url_prefix="/api/correlation")
    app.register_blueprint(data_entry, url_prefix="/api/dataentry")
    app.register_blueprint(wgcna, url_prefix="/api/wgcna")
    app.register_blueprint(ctl, url_prefix="/api/ctl")
    app.register_blueprint(async_commands, url_prefix="/api/async_commands")
    app.register_blueprint(menu, url_prefix="/api/menu")
    app.register_blueprint(search, url_prefix="/api/search")
    app.register_blueprint(metadata, url_prefix="/api/metadata")
    app.register_blueprint(sampledata, url_prefix="/api/sampledata")
    app.register_blueprint(caseattr, url_prefix="/api/case-attribute")
    app.register_blueprint(gnqa, url_prefix="/api/llm")
    app.register_blueprint(rqtl2, url_prefix="/api/rqtl2")

    register_error_handlers(app)
    return app