from __future__ import annotations

from .shared import *
from .helpers import _extract_text_from_upload, _resolve_tenant_id

@router.get("/knowledge-base/docs")
async def list_knowledge_docs(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _ = current_user
    service = AdaptiveRAGService(db, tenant_id=_resolve_tenant_id(current_user, tenant_id))
    return success_response(await service.list_knowledge_docs())

@router.post("/knowledge-base/docs")
async def create_knowledge_doc(
    request: KnowledgeDocCreateRequest,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    service = AdaptiveRAGService(db, tenant_id=_resolve_tenant_id(current_user, tenant_id))
    result = await service.create_knowledge_doc(
        title=request.title,
        file_type=request.file_type,
        raw_content=request.content,
        uploaded_by=int(current_user.id),
        source_type=request.source_type,
        file_url=request.file_url,
        project_id=request.project_id,
    )
    return success_response(result)

@router.post("/knowledge-base/upload")
async def upload_knowledge_doc(
    file: UploadFile = File(...),
    project_id: int | None = Form(default=None),
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    raw = await file.read()
    if not raw:
        raise HTTPException(status_code=400, detail="上传文件为空")
    if len(raw) > 15 * 1024 * 1024:
        raise HTTPException(status_code=400, detail="文件过大，限制 15MB")

    file_type, text = _extract_text_from_upload(file.filename or "uploaded.txt", raw)
    if not str(text or "").strip():
        raise HTTPException(status_code=400, detail="无法提取有效文本内容")

    effective_tenant_id = _resolve_tenant_id(current_user, tenant_id)
    service = AdaptiveRAGService(db, tenant_id=effective_tenant_id)
    doc = await service.create_knowledge_doc_placeholder(
        title=(file.filename or "uploaded.txt")[:255],
        file_type=file_type,
        uploaded_by=int(current_user.id),
        source_type="file",
        file_url=None,
    )
    asyncio.create_task(
        AdaptiveRAGService.process_knowledge_doc_content_async(
            tenant_id=effective_tenant_id,
            doc_id=int(doc.id),
            raw_content=text,
            project_id=project_id,
        )
    )
    return success_response(service._serialize_doc(doc))

@router.post("/knowledge-base/urls")
async def create_knowledge_url(
    request: KnowledgeURLCreateRequest,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    url = str(request.url or "").strip()
    if not re.match(r"^https?://", url, flags=re.IGNORECASE):
        raise HTTPException(status_code=400, detail="URL 必须以 http:// 或 https:// 开头")

    effective_tenant_id = _resolve_tenant_id(current_user, tenant_id)
    service = AdaptiveRAGService(db, tenant_id=effective_tenant_id)
    doc = await service.create_knowledge_doc_placeholder(
        title=(request.title or url)[:255],
        file_type="url",
        uploaded_by=int(current_user.id),
        source_type="url",
        file_url=url,
    )
    asyncio.create_task(
        AdaptiveRAGService.refresh_url_doc_async(
            tenant_id=effective_tenant_id,
            doc_id=int(doc.id),
            project_id=request.project_id,
        )
    )
    return success_response(service._serialize_doc(doc))

@router.post("/knowledge-base/docs/{doc_id}/refresh")
async def refresh_knowledge_doc(
    doc_id: int,
    project_id: int | None = Query(default=None),
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    effective_tenant_id = _resolve_tenant_id(current_user, tenant_id)
    service = AdaptiveRAGService(db, tenant_id=effective_tenant_id)
    try:
        doc = await service.get_knowledge_doc(doc_id=doc_id)
        if str(doc.get("source_type") or "").lower() != "url":
            raise HTTPException(status_code=400, detail="仅 URL 类型条目支持 refresh")
        marked = await service.mark_doc_processing(doc_id=doc_id)
    except ValueError as exc:
        raise HTTPException(status_code=404, detail=str(exc)) from exc

    asyncio.create_task(
        AdaptiveRAGService.refresh_url_doc_async(
            tenant_id=effective_tenant_id,
            doc_id=doc_id,
            project_id=project_id,
        )
    )
    return success_response(marked)

@router.delete("/knowledge-base/docs/{doc_id}")
async def delete_knowledge_doc(
    doc_id: int,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    tenant_id: int = Depends(get_tenant_id),
):
    _ = current_user
    service = AdaptiveRAGService(db, tenant_id=_resolve_tenant_id(current_user, tenant_id))
    ok = await service.delete_knowledge_doc(doc_id=doc_id)
    if not ok:
        raise HTTPException(status_code=404, detail="文档不存在")
    return success_response({"deleted": True, "doc_id": doc_id})