"""方案计划文档管理系统（DMS）后端模块。"""

from __future__ import annotations

import logging
from pathlib import Path

from flask import Flask

from dms.api.v1 import api_v1
from dms.api.v1.blueprint import (
    register_dms_response_headers,
    register_dms_routing_error_handlers,
)
from dms.config import (
    load_dms_config,
    resolve_backup_config_path,
    resolve_env_path,
)
from dms.extensions import db
from dms.services.backup_service import BackupEngine, BackupOutcome
from dms.services.document_relation_service import load_relation_presets
from dms.services.ui_dictionary_service import load_ui_dictionary_config
from dms.storage.paths import ensure_storage_directories
from dms.services.document_converter import create_converter

logger = logging.getLogger(__name__)


def init_dms(app: Flask) -> None:
    """初始化独立DMS基础设施并注册 ``/api/v1`` Blueprint。"""
    app.config.from_mapping(load_dms_config())
    app.extensions["dms_ui_dictionaries"] = load_ui_dictionary_config(
        app.config["DMS_UI_DICTIONARY_CONFIG_PATH"]
    )
    app.extensions["dms_relation_presets"] = load_relation_presets(
        app.config["DMS_DOCUMENT_RELATION_PRESET_CONFIG_PATH"]
    )
    app.extensions["dms_document_converter"] = create_converter(app.config)
    db.init_app(app)

    # 导入模型以确保SQLAlchemy metadata完整；不触发数据库连接。
    import dms.models  # noqa: F401

    ensure_storage_directories(app.config["DMS_STORAGE_ROOT"])
    app.register_blueprint(api_v1)
    register_dms_routing_error_handlers(app)
    register_dms_response_headers(app)

    backup_engine = BackupEngine(
        storage_root=Path(app.config["DMS_STORAGE_ROOT"]),
        business_timezone=app.config["DMS_BUSINESS_TIMEZONE"],
        database_url=app.config["SQLALCHEMY_DATABASE_URI"],
        backup_config_path=resolve_backup_config_path(),
        env_path=resolve_env_path(),
    )
    app.extensions["dms_backup_engine"] = backup_engine
    backup_engine.start_scheduler(
        lambda outcome: _write_schedule_audit(app, outcome)
    )


def _write_schedule_audit(app: Flask, outcome: BackupOutcome) -> None:
    """定时备份终态审计落库（无请求上下文，独立短事务）。"""
    from dms.common.enums import AuditAction, AuditResult, AuditTarget
    from dms.models import AuditLog

    try:
        with app.app_context():
            db.session.add(
                AuditLog(
                    username="system",
                    action_type=AuditAction.BACKUP_CREATE.value,
                    target_type=AuditTarget.BACKUP.value,
                    target_id=0,
                    target_name=outcome.type,
                    operation_result=(
                        AuditResult.SUCCESS.value
                        if outcome.success
                        else AuditResult.FAILURE.value
                    ),
                    failure_reason=(
                        None
                        if outcome.success or outcome.error is None
                        else outcome.error[:1000]
                    ),
                    operation_detail={
                        "type": outcome.type,
                        "trigger": outcome.trigger,
                        "backupId": outcome.backup_id,
                    },
                )
            )
            db.session.commit()
    except Exception:  # noqa: BLE001 - 审计失败不否定已触发的备份
        logger.warning("定时备份审计写入失败", exc_info=True)
        with app.app_context():
            db.session.rollback()


__all__ = ["init_dms"]