"""JarvisChat routers - /api/upload file/document attachment endpoint."""
import json
import logging
import os
from datetime import datetime, timezone, timedelta

import httpx
from fastapi import APIRouter, HTTPException, Request, UploadFile, File, Form
from fastapi.responses import JSONResponse

from config import UPLOAD_DIR, MAX_UPLOAD_BYTES, SUPPORTED_UPLOAD_TYPES, UPLOAD_CONTEXT_EXPIRY_HOURS
from db import get_db, insert_upload_context, list_upload_context_by_conversation, delete_upload_context_by_id
from rag import chunk_text, maybe_evict, QDRANT_URL, EMBED_URL, EMBED_MODEL, RAG_COLLECTION

log = logging.getLogger("jarvischat")
router = APIRouter()


def _point_id(filename: str, chunk_idx: int) -> str:
    return f"upload-{filename}-{chunk_idx}"


@router.post("/api/upload")
async def upload_file(
    request: Request,
    file: UploadFile = File(...),
    mode: str = Form("both"),
    conversation_id: str = Form(""),
):
    if mode not in ("context", "ingest", "both"):
        raise HTTPException(status_code=422, detail="mode must be context, ingest, or both")

    if file.size and file.size > MAX_UPLOAD_BYTES:
        return JSONResponse(status_code=413, content={"detail": f"File exceeds {MAX_UPLOAD_BYTES} byte limit"})

    content_type = file.content_type or "application/octet-stream"
    if content_type not in SUPPORTED_UPLOAD_TYPES:
        return JSONResponse(status_code=415, content={"detail": f"Unsupported file type: {content_type}"})

    raw_bytes = await file.read()
    if not raw_bytes:
        raise HTTPException(status_code=422, detail="Empty file")

    if content_type == "application/pdf":
        try:
            from pypdf import PdfReader
            import io
            reader = PdfReader(io.BytesIO(raw_bytes))
            extracted = "\n".join(page.extract_text() or "" for page in reader.pages)
        except Exception as e:
            log.warning(f"PDF extraction error: {e}")
            raise HTTPException(status_code=422, detail="Failed to extract text from PDF")
    else:
        extracted = raw_bytes.decode("utf-8", errors="replace")

    result = {"filename": file.filename, "size_bytes": len(raw_bytes), "mode": mode}

    if mode in ("ingest", "both"):
        os.makedirs(UPLOAD_DIR, exist_ok=True)
        chunks = chunk_text(extracted)
        ingested = 0
        async with httpx.AsyncClient() as client:
            for i, chunk in enumerate(chunks):
                embed_resp = await client.post(
                    f"{EMBED_URL}/api/embeddings",
                    json={"model": EMBED_MODEL, "prompt": chunk},
                    timeout=30.0,
                )
                if embed_resp.status_code != 200:
                    log.warning(f"Embedding failed for chunk {i}: {embed_resp.status_code}")
                    continue
                vector = embed_resp.json()["embedding"]
                pid = _point_id(file.filename or "unnamed", i)
                upsert_resp = await client.put(
                    f"{QDRANT_URL}/collections/{RAG_COLLECTION}/points?wait=true",
                    json={
                        "points": [{
                            "id": pid,
                            "vector": vector,
                            "payload": {"text": chunk, "source": file.filename, "upload_date": datetime.now(timezone.utc).isoformat(), "type": "upload"},
                        }]
                    },
                    timeout=30.0,
                )
                if upsert_resp.status_code in (200, 201):
                    ingested += 1
                else:
                    log.warning(f"Qdrant upsert failed for chunk {i}: {upsert_resp.status_code}")
        result["chunks_ingested"] = ingested
        if ingested > 0:
            evicted = await maybe_evict()
            if evicted:
                log.info(f"Evicted {evicted} vectors after upload")

    if mode in ("context", "both"):
        expires = (datetime.now(timezone.utc) + timedelta(hours=UPLOAD_CONTEXT_EXPIRY_HOURS)).isoformat()
        db = get_db()
        try:
            cid = insert_upload_context(db, conversation_id or "", file.filename or "unnamed", extracted, expires, content_type)
            db.commit()
            result["context_id"] = cid
        finally:
            db.close()

    result["message"] = f"Uploaded {file.filename}"
    return result


@router.patch("/api/upload/{context_id}/link")
async def link_upload_to_conversation(context_id: int, request: Request):
    body = await request.json()
    conv_id = body.get("conversation_id", "").strip()
    if not conv_id:
        raise HTTPException(status_code=422, detail="conversation_id required")
    db = get_db()
    try:
        row = db.execute("SELECT id FROM upload_context WHERE id = ?", (context_id,)).fetchone()
        if not row:
            raise HTTPException(status_code=404, detail="Upload context not found")
        db.execute("UPDATE upload_context SET conversation_id = ? WHERE id = ?", (conv_id, context_id))
        db.commit()
        return {"status": "ok"}
    finally:
        db.close()


@router.get("/api/upload/by-conversation/{conv_id}")
async def get_upload_by_conversation(conv_id: str):
    db = get_db()
    try:
        items = list_upload_context_by_conversation(db, conv_id)
        return items
    finally:
        db.close()


@router.delete("/api/upload/{context_id}")
async def delete_upload(context_id: int):
    db = get_db()
    try:
        row = db.execute("SELECT filename FROM upload_context WHERE id = ?", (context_id,)).fetchone()
        if not row:
            raise HTTPException(status_code=404, detail="Attachment not found")
        filename = row["filename"]
        if not filename:
            filename = "unnamed"
        delete_upload_context_by_id(db, context_id)
        db.commit()
    finally:
        db.close()

    try:
        async with httpx.AsyncClient() as client:
            scroll_resp = await client.post(
                f"{QDRANT_URL}/collections/{RAG_COLLECTION}/points/scroll",
                json={"filter": {"must": [{"key": "source", "match": {"value": filename}}]}, "limit": 100, "with_payload": False},
                timeout=10.0,
            )
            if scroll_resp.status_code == 200:
                points = scroll_resp.json().get("result", {}).get("points", [])
                point_ids = [p["id"] for p in points]
                if point_ids:
                    await client.post(
                        f"{QDRANT_URL}/collections/{RAG_COLLECTION}/points/delete",
                        json={"points": point_ids},
                        timeout=10.0,
                    )
                    log.info(f"Deleted {len(point_ids)} Qdrant points for source '{filename}'")
    except Exception as e:
        log.warning(f"Qdrant cleanup for '{filename}' failed: {e}")

    return {"status": "ok", "filename": filename}