"""
Admin API — /api/v1/collections, /api/v1/delete
Management endpoints for tenant collections.
"""

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field
from loguru import logger

from app.core.qdrant_client import qdrant_manager
from app.core.security import verify_api_key

router = APIRouter()


# ─── List All Collections ─────────────────────────────────────────────────────

@router.get("/collections")
async def list_collections(_: str = Depends(verify_api_key)):
    """
    List all Qdrant collections currently in the instance.
    Returns both kb_* tenant collections and any other collections.

    **Required Header:** `X-RAG-API-Key`
    """
    try:
        collections = await qdrant_manager.list_all_collections()
        tenant_collections = [c for c in collections if c.startswith("kb_")]
        return {
            "total": len(collections),
            "tenant_collections": tenant_collections,
            "all_collections": collections,
        }
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


# ─── Collection Info ──────────────────────────────────────────────────────────

@router.get("/collections/{company_id}")
async def get_collection_info(
    company_id: str,
    _: str = Depends(verify_api_key),
):
    """
    Get stats for a specific tenant's collection.
    Returns vector count, point count, and status.

    **Required Header:** `X-RAG-API-Key`
    """
    try:
        info = await qdrant_manager.get_collection_info(company_id)
        return info
    except Exception as e:
        raise HTTPException(status_code=404, detail=f"Collection not found: {str(e)}")


# ─── Delete Tenant Collection ─────────────────────────────────────────────────

class DeleteRequest(BaseModel):
    company_id: str = Field(..., description="Tenant to permanently remove.")
    confirm: bool = Field(
        ...,
        description="Must be `true` to confirm deletion. Irreversible.",
    )


@router.post("/delete")
async def delete_tenant(
    body: DeleteRequest,
    _: str = Depends(verify_api_key),
):
    """
    Permanently delete a tenant's entire knowledge base collection.
    **This is irreversible.** All embedded documents are lost.

    Requires `confirm: true` in the request body as a safety check.

    Uses POST instead of DELETE to avoid request body stripping by proxies/CDNs.

    **Required Header:** `X-RAG-API-Key`
    """
    if not body.confirm:
        raise HTTPException(
            status_code=400,
            detail="Deletion not confirmed. Set 'confirm': true to proceed.",
        )

    try:
        result = await qdrant_manager.delete_tenant_collection(body.company_id)
        logger.info(f"Admin deleted collection for '{body.company_id}'")
        return {
            "status": "deleted",
            "company_id": body.company_id,
            "collection": result["collection"],
            "message": f"Collection '{result['collection']}' permanently deleted.",
        }
    except Exception as e:
        logger.error(f"Delete failed for '{body.company_id}': {e}")
        raise HTTPException(status_code=500, detail=str(e))


# ─── Delete Specific Source from a Collection ─────────────────────────────────

class DeleteSourceRequest(BaseModel):
    company_id: str = Field(...)
    source: str = Field(..., description="Filename or URL to remove from the collection.")


@router.post("/delete/source")
async def delete_source(
    body: DeleteSourceRequest,
    _: str = Depends(verify_api_key),
):
    """
    Delete all chunks belonging to a specific source (file or URL)
    from a tenant's collection, without deleting the entire collection.

    Use this when a company updates a document — delete old version, re-ingest new.

    Uses POST instead of DELETE to avoid request body stripping by proxies/CDNs.

    **Required Header:** `X-RAG-API-Key`
    """
    try:
        await qdrant_manager.delete_chunks_by_source(body.company_id, body.source)
        return {
            "status": "deleted",
            "company_id": body.company_id,
            "source": body.source,
            "message": f"All chunks for source '{body.source}' deleted from 'kb_{body.company_id}'.",
        }
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))