"""文档服务实现。"""

from __future__ import annotations

import hashlib
import mimetypes
import time
from pathlib import Path

from sqlalchemy import text

from fastapi_common.fastapi_common_sqlalchemy.database import GetAsyncSession
from fastapi_common.fastapi_common_web.domain.responses import StatusCodeEnum
from fastapi_common.fastapi_common_web.exception.LeauditException import LeauditException
from fastapi_common.fastapi_common_storage.oss_path_utils import OssPathUtils

from fastapi_modules.fastapi_leaudit.domian.vo.documentVo import DocumentUploadVO
from fastapi_modules.fastapi_leaudit.models import LeauditDocument, LeauditDocumentFile
from fastapi_modules.fastapi_leaudit.services import IAuditService, IDocumentService, IOssService
from fastapi_modules.fastapi_leaudit.services.impl.auditServiceImpl import AuditServiceImpl
from fastapi_modules.fastapi_leaudit.services.impl.ossServiceImpl import OssServiceImpl


class DocumentServiceImpl(IDocumentService):
    """文档服务实现。"""

    def __init__(
        self,
        OssService: IOssService | None = None,
        AuditService: IAuditService | None = None,
    ) -> None:
        self.OssService = OssService or OssServiceImpl()
        self.AuditService = AuditService or AuditServiceImpl()

    async def Upload(
        self,
        FileName: str,
        FileContent: bytes,
        ContentType: str | None,
        TypeId: int | None = None,
        TypeCode: str | None = None,
        BizDocumentId: int | None = None,
        Region: str = "default",
        FileRole: str = "primary",
        CreatedBy: int | None = None,
        AutoRun: bool = False,
    ) -> DocumentUploadVO:
        """上传文档并建立 LeAudit document/file 记录。"""
        if not FileName:
            raise LeauditException(StatusCodeEnum.HTTP_400_BAD_REQUEST, "上传文件名不能为空")
        if not FileContent:
            raise LeauditException(StatusCodeEnum.HTTP_400_BAD_REQUEST, "上传文件内容不能为空")
        if not TypeId and not TypeCode:
            raise LeauditException(StatusCodeEnum.HTTP_400_BAD_REQUEST, "typeId 与 typeCode 至少传一个")

        normalizedRegion = (Region or "default").strip() or "default"
        normalizedFileRole = (FileRole or "primary").strip() or "primary"
        fileExt = Path(FileName).suffix.lstrip(".").lower() or None
        mimeType = ContentType or mimetypes.guess_type(FileName)[0] or "application/octet-stream"
        fileSha256 = hashlib.sha256(FileContent).hexdigest()
        fileSize = len(FileContent)

        async with GetAsyncSession() as Session:
            if TypeId is not None and TypeCode is not None:
                typeResult = await Session.execute(
                    text(
                        """
                        SELECT id, code
                        FROM leaudit_document_types
                        WHERE id = :type_id
                          AND code = :type_code
                          AND deleted_at IS NULL
                        LIMIT 1
                        """
                    ),
                    {"type_id": TypeId, "type_code": TypeCode},
                )
            elif TypeId is not None:
                typeResult = await Session.execute(
                    text(
                        """
                        SELECT id, code
                        FROM leaudit_document_types
                        WHERE id = :type_id
                          AND deleted_at IS NULL
                        LIMIT 1
                        """
                    ),
                    {"type_id": TypeId},
                )
            else:
                typeResult = await Session.execute(
                    text(
                        """
                        SELECT id, code
                        FROM leaudit_document_types
                        WHERE code = :type_code
                          AND deleted_at IS NULL
                        LIMIT 1
                        """
                    ),
                    {"type_code": TypeCode},
                )
            typeRow = typeResult.mappings().first()
            if not typeRow:
                raise LeauditException(StatusCodeEnum.HTTP_404_NOT_FOUND, "文档类型不存在或已停用")

            resolvedTypeId = int(typeRow["id"])
            resolvedTypeCode = str(typeRow["code"])
            resolvedBizDocumentId = BizDocumentId or int(time.time() * 1000)

            document = await LeauditDocument.upsert_by_biz_id(
                Session,
                bizDocumentId=resolvedBizDocumentId,
                typeId=resolvedTypeId,
                region=normalizedRegion,
                processingStatus="waiting",
            )

            versionCount = await LeauditDocumentFile.count_by_document(Session, document.Id)
            versionNo = f"v{versionCount + 1}"
            objectKey = OssPathUtils.BuildBusinessDocKey(
                Region=normalizedRegion,
                TypeCode=resolvedTypeCode,
                DocumentId=document.Id,
                Version=versionNo,
                FileRole=normalizedFileRole,
                FileName=FileName,
            )
            ossUrl = await self.OssService.UploadBytes(
                ObjectKey=objectKey,
                Content=FileContent,
                ContentType=mimeType,
            )

            await LeauditDocumentFile.deactivate_active_by_document(Session, document.Id)
            documentFile = LeauditDocumentFile(
                documentId=document.Id,
                fileRole=normalizedFileRole,
                fileName=FileName,
                fileExt=fileExt,
                mimeType=mimeType,
                fileSize=fileSize,
                sha256=fileSha256,
                localPath=None,
                ossUrl=ossUrl,
                storageProvider="minio",
                isActive=True,
                createdBy=CreatedBy,
            )
            Session.add(documentFile)
            await Session.flush()
            await Session.commit()
            await Session.refresh(document)
            await Session.refresh(documentFile)

        run = None
        processingStatus = document.processingStatus or "waiting"
        if AutoRun:
            run = await self.AuditService.Run(DocumentId=document.Id)
            processingStatus = "running" if run.status in {"pending", "running"} else run.status

        return DocumentUploadVO(
            documentId=document.Id,
            bizDocumentId=document.bizDocumentId,
            fileId=documentFile.Id,
            typeId=resolvedTypeId,
            typeCode=resolvedTypeCode,
            region=normalizedRegion,
            fileName=documentFile.fileName,
            ossUrl=ossUrl,
            processingStatus=processingStatus,
            autoRunTriggered=AutoRun,
            run=run,
        )