"""contracts-flask v2.0 — полный перенос с ВМ на Flask.
Больше никаких прокси на contracts.kube5s.ru — всё локально.
"""
from flask import Flask
from app.config import VERSION, MAX_CONTENT_LENGTH
from app.routes import register_routes


def create_app():
    app = Flask(__name__)
    app.config["VERSION"] = VERSION
    app.config["MAX_CONTENT_LENGTH"] = MAX_CONTENT_LENGTH

    # DB auto-seed — schema migration + seed prompts + crash recovery
    _init_db()

    # Регистрация всех blueprint'ов
    register_routes(app)

    # no_cache на все ответы
    @app.after_request
    def no_cache(response):
        response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
        response.headers["Pragma"] = "no-cache"
        response.headers["Expires"] = "0"
        return response

    return app


def _init_db():
    """Schema migration + recovery: сброс застрявших classify."""
    try:
        from app.db.connection import execute

        for sql in [
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS classify_raw text",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS classify_input text",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS zip_source text",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS content_hash text",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS batch_id uuid",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS classify_status text DEFAULT 'pending'",
            "ALTER TABLE documents ALTER COLUMN classify_status SET DEFAULT 'pending'",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS doc_type text",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS own_number text",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS parent_number text",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS doc_date date",
            "ALTER TABLE documents ADD COLUMN IF NOT EXISTS counterparty text",
        ]:
            execute(sql)

        from app.db import prompts as db_prompts
        db_prompts.seed_defaults()

        # Crash recovery: сбросить застрявшие classify
        execute(
            "UPDATE documents SET classify_status='pending', error_message=NULL "
            "WHERE classify_status='processing'"
        )
    except Exception:
        pass  # БД недоступна при старте — не фатально


app = create_app()