"""
Version 0.1
"""

from __future__ import annotations

from typing import Any, Optional, List
import uuid

from fastapi import APIRouter
from pydantic import BaseModel, Field
from qdrant_client import QdrantClient
from qdrant_client.http.models import (
    Distance,
    VectorParams,
    PointStruct,
    Filter,
    FieldCondition,
    MatchValue,
)

from ..config import get_settings
from ..embeddings import embed_texts

router = APIRouter(prefix="/qdrant", tags=["qdrant"])

def _client() -> QdrantClient:
    s = get_settings()
    return QdrantClient(url=s.QDRANT_URL, api_key=s.QDRANT_API_KEY)

def _col(name: str) -> str:
    return f"{get_settings().COLLECTION_PREFIX}_{name}"

def _uuid5(s: str) -> str:
    """Deterministic UUIDv5 from arbitrary string (server-side point id)."""
    return str(uuid.uuid5(uuid.NAMESPACE_URL, s))

# --- Models ---
class BaseMeta(BaseModel):
    note_id: str = Field(..., description="Stable ID of the note (e.g., hash of vault-relative path)")
    title: Optional[str] = Field(None, description="Note or chunk title")
    path: Optional[str] = Field(None, description="Vault-relative path to the .md file")
    Typ: Optional[str] = None
    Status: Optional[str] = None
    tags: Optional[List[str]] = None
    Rolle: Optional[List[str]] = None  # allow list

class UpsertChunkRequest(BaseMeta):
    chunk_id: str = Field(..., description="Stable ID of the chunk within the note")
    text: str = Field(..., description="Chunk text content")
    links: Optional[List[str]] = Field(default=None, description="Outbound links detected in the chunk")

class UpsertNoteRequest(BaseMeta):
    text: Optional[str] = Field(None, description="Full note text (optional)")

class UpsertEdgeRequest(BaseModel):
    src_note_id: str
    dst_note_id: Optional[str] = None
    src_chunk_id: Optional[str] = None
    dst_chunk_id: Optional[str] = None
    relation: str = Field(default="links_to")
    link_text: Optional[str] = None

class QueryRequest(BaseModel):
    query: str
    limit: int = 5
    note_id: Optional[str] = None
    path: Optional[str] = None
    tags: Optional[List[str]] = None

# --- Helpers ---
def _ensure_collections():
    s = get_settings()
    cli = _client()
    # chunks
    try:
        cli.get_collection(_col("chunks"))
    except Exception:
        cli.recreate_collection(_col("chunks"), vectors_config=VectorParams(size=s.VECTOR_SIZE, distance=Distance.COSINE))
    # notes
    try:
        cli.get_collection(_col("notes"))
    except Exception:
        cli.recreate_collection(_col("notes"), vectors_config=VectorParams(size=s.VECTOR_SIZE, distance=Distance.COSINE))
    # edges (dummy vector of size 1)
    try:
        cli.get_collection(_col("edges"))
    except Exception:
        cli.recreate_collection(_col("edges"), vectors_config=VectorParams(size=1, distance=Distance.COSINE))

@router.post("/upsert_chunk", summary="Upsert a chunk into mindnet_chunks")
def upsert_chunk(req: UpsertChunkRequest) -> dict:
    _ensure_collections()
    cli = _client()
    vec = embed_texts([req.text])[0]
    payload: dict[str, Any] = req.model_dump()
    payload.pop("text", None)
    payload["preview"] = (req.text[:240] + "…") if len(req.text) > 240 else req.text
    qdrant_id = _uuid5(f"chunk:{req.chunk_id}")
    pt = PointStruct(id=qdrant_id, vector=vec, payload=payload)
    cli.upsert(collection_name=_col("chunks"), points=[pt])
    return {"status": "ok", "id": qdrant_id}

@router.post("/upsert_note", summary="Upsert a note into mindnet_notes")
def upsert_note(req: UpsertNoteRequest) -> dict:
    _ensure_collections()
    cli = _client()
    text_for_embedding = req.text if req.text else (req.title or req.note_id)
    vec = embed_texts([text_for_embedding])[0]
    payload: dict[str, Any] = req.model_dump()
    payload.pop("text", None)
    qdrant_id = _uuid5(f"note:{req.note_id}")
    pt = PointStruct(id=qdrant_id, vector=vec, payload=payload)
    cli.upsert(collection_name=_col("notes"), points=[pt])
    return {"status": "ok", "id": qdrant_id}

@router.post("/upsert_edge", summary="Upsert a graph edge into mindnet_edges")
def upsert_edge(req: UpsertEdgeRequest) -> dict:
    _ensure_collections()
    cli = _client()
    payload = req.model_dump()
    vec = [0.0]
    raw_edge_id = f"{req.src_note_id}|{req.src_chunk_id or ''}->{req.dst_note_id or ''}|{req.dst_chunk_id or ''}|{req.relation}"
    qdrant_id = _uuid5(f"edge:{raw_edge_id}")
    pt = PointStruct(id=qdrant_id, vector=vec, payload=payload)
    cli.upsert(collection_name=_col("edges"), points=[pt])
    return {"status": "ok", "id": qdrant_id}

@router.post("/query", summary="Vector query over mindnet_chunks with optional filters")
def query(req: QueryRequest) -> dict:
    _ensure_collections()
    cli = _client()
    vec = embed_texts([req.query])[0]

    flt: Optional[Filter] = None
    conds = []
    if req.note_id:
        conds.append(FieldCondition(key="note_id", match=MatchValue(value=req.note_id)))
    if req.path:
        conds.append(FieldCondition(key="path", match=MatchValue(value=req.path)))
    if req.tags:
        for t in req.tags:
            conds.append(FieldCondition(key="tags", match=MatchValue(value=t)))
    if conds:
        flt = Filter(must=conds)

    res = cli.search(collection_name=_col("chunks"), query_vector=vec, limit=req.limit, with_payload=True, with_vectors=False, query_filter=flt)
    hits = []
    for p in res:
        pl = p.payload or {}
        hits.append({
            "chunk_id": p.id,
            "score": p.score,
            "note_id": pl.get("note_id"),
            "title": pl.get("title"),
            "path": pl.get("path"),
            "preview": pl.get("preview"),
            "tags": pl.get("tags"),
        })
    return {"results": hits}