import os

from django.apps import AppConfig


class AppConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'app'

    def ready(self):
        # SQLite 优化：每个新连接执行 PRAGMA
        # - journal_mode=DELETE：传统 rollback journal 模式，只产生一个 monitor.sqlite3 文件
        # - busy_timeout=5000：写冲突等 5s 而非立即报错
        # - cache_size=-65536：64MB 页缓存
        # - temp_store=MEMORY：临时表用内存
        from django.db.backends.signals import connection_created

        def _setup_sqlite_pragma(sender, connection, **kwargs):
            if connection.vendor != 'sqlite':
                return
            with connection.cursor() as cur:
                cur.execute('PRAGMA journal_mode=DELETE;')
                cur.execute('PRAGMA busy_timeout=5000;')
                cur.execute('PRAGMA cache_size=-65536;')
                cur.execute('PRAGMA temp_store=MEMORY;')

        connection_created.connect(_setup_sqlite_pragma)

        from monitor_runtime.paths import DESKTOP
        if DESKTOP:
            return  # Desktop bootstrap migrates before accessing business tables.

        try:
            from app.utils.schema_upgrade import ensure_biz_algorithm_line_count_columns
            ensure_biz_algorithm_line_count_columns()
        except Exception as e:
            import logging
            logging.getLogger("app.bootstrap").warning("schema upgrade: %s", e)

        try:
            from django.contrib.auth.models import Group
            for role in ("system_admin", "algorithm_admin", "operator", "viewer"):
                Group.objects.get_or_create(name=role)
            from app.utils.Credentials import migrate_existing_credentials
            changed = migrate_existing_credentials()
            if changed:
                import logging
                logging.getLogger("app.bootstrap").info("encrypted credentials in %d database rows", changed)
        except Exception as e:
            import logging
            logging.getLogger("app.bootstrap").warning("security data upgrade: %s", e)

        mode = os.environ.get("MONITOR_SERVICE_MODE", "disabled").strip().lower()
        # Backward-compatible opt-in, still protected by the cross-process lock.
        if mode == "disabled" and os.environ.get("MONITOR_BOOTSTRAP_SERVICES", "").lower() in (
            "1", "true", "yes", "on"
        ):
            mode = "embedded"
        if mode == "embedded":
            from app.services.lifecycle import get_service_manager
            get_service_manager().start()