import os

from configs import dify_config

if not dify_config.DEBUG:
    from gevent import monkey

    monkey.patch_all()

    import grpc.experimental.gevent

    grpc.experimental.gevent.init_gevent()

import json

from flask import Flask, Response, request
from flask_cors import CORS
from werkzeug.exceptions import Unauthorized

import contexts
from commands import register_commands
from configs import dify_config
from extensions import (
    ext_celery,
    ext_code_based_extension,
    ext_compress,
    ext_database,
    ext_hosting_provider,
    ext_logging,
    ext_login,
    ext_mail,
    ext_migrate,
    ext_proxy_fix,
    ext_redis,
    ext_sentry,
    ext_storage,
)
from extensions.ext_database import db
from extensions.ext_login import login_manager
from libs.passport import PassportService
from services.account_service import AccountService


class DifyApp(Flask):
    pass


# ----------------------------
# Application Factory Function
# ----------------------------
def create_flask_app_with_configs() -> Flask:
    """
    create a raw flask app
    with configs loaded from .env file
    """
    dify_app = DifyApp(__name__)
    dify_app.config.from_mapping(dify_config.model_dump())

    # populate configs into system environment variables
    for key, value in dify_app.config.items():
        if isinstance(value, str):
            os.environ[key] = value
        elif isinstance(value, int | float | bool):
            os.environ[key] = str(value)
        elif value is None:
            os.environ[key] = ""

    return dify_app


def create_app() -> Flask:
    app = create_flask_app_with_configs()
    app.secret_key = dify_config.SECRET_KEY
    initialize_extensions(app)
    register_blueprints(app)
    register_commands(app)

    return app


def initialize_extensions(app):
    # Since the application instance is now created, pass it to each Flask
    # extension instance to bind it to the Flask application instance (app)
    ext_logging.init_app(app)
    ext_compress.init_app(app)
    ext_code_based_extension.init()
    ext_database.init_app(app)
    ext_migrate.init(app, db)
    ext_redis.init_app(app)
    ext_storage.init_app(app)
    ext_celery.init_app(app)
    ext_login.init_app(app)
    ext_mail.init_app(app)
    ext_hosting_provider.init_app(app)
    ext_sentry.init_app(app)
    ext_proxy_fix.init_app(app)


# Flask-Login configuration
@login_manager.request_loader
def load_user_from_request(request_from_flask_login):
    """Load user based on the request."""
    if request.blueprint not in {"console", "inner_api"}:
        return None
    # Check if the user_id contains a dot, indicating the old format
    auth_header = request.headers.get("Authorization", "")
    if not auth_header:
        auth_token = request.args.get("_token")
        if not auth_token:
            raise Unauthorized("Invalid Authorization token.")
    else:
        if " " not in auth_header:
            raise Unauthorized("Invalid Authorization header format. Expected 'Bearer <api-key>' format.")
        auth_scheme, auth_token = auth_header.split(None, 1)
        auth_scheme = auth_scheme.lower()
        if auth_scheme != "bearer":
            raise Unauthorized("Invalid Authorization header format. Expected 'Bearer <api-key>' format.")

    decoded = PassportService().verify(auth_token)
    user_id = decoded.get("user_id")

    logged_in_account = AccountService.load_logged_in_account(account_id=user_id)
    if logged_in_account:
        contexts.tenant_id.set(logged_in_account.current_tenant_id)
    return logged_in_account


@login_manager.unauthorized_handler
def unauthorized_handler():
    """Handle unauthorized requests."""
    return Response(
        json.dumps({"code": "unauthorized", "message": "Unauthorized."}),
        status=401,
        content_type="application/json",
    )


# register blueprint routers
def register_blueprints(app):
    from controllers.console import bp as console_app_bp
    from controllers.files import bp as files_bp
    from controllers.inner_api import bp as inner_api_bp
    from controllers.service_api import bp as service_api_bp
    from controllers.web import bp as web_bp

    CORS(
        service_api_bp,
        allow_headers=["Content-Type", "Authorization", "X-App-Code"],
        methods=["GET", "PUT", "POST", "DELETE", "OPTIONS", "PATCH"],
    )
    app.register_blueprint(service_api_bp)

    CORS(
        web_bp,
        resources={r"/*": {"origins": dify_config.WEB_API_CORS_ALLOW_ORIGINS}},
        supports_credentials=True,
        allow_headers=["Content-Type", "Authorization", "X-App-Code"],
        methods=["GET", "PUT", "POST", "DELETE", "OPTIONS", "PATCH"],
        expose_headers=["X-Version", "X-Env"],
    )

    app.register_blueprint(web_bp)

    CORS(
        console_app_bp,
        resources={r"/*": {"origins": dify_config.CONSOLE_CORS_ALLOW_ORIGINS}},
        supports_credentials=True,
        allow_headers=["Content-Type", "Authorization"],
        methods=["GET", "PUT", "POST", "DELETE", "OPTIONS", "PATCH"],
        expose_headers=["X-Version", "X-Env"],
    )

    app.register_blueprint(console_app_bp)

    CORS(files_bp, allow_headers=["Content-Type"], methods=["GET", "PUT", "POST", "DELETE", "OPTIONS", "PATCH"])
    app.register_blueprint(files_bp)

    app.register_blueprint(inner_api_bp)