#!/usr/bin/env python3
"""Phase-0 retrieval — thin wrappers over Spark Control /api/search.

These are the retrieval modes the CRM MCP server (Workstream C) will expose:
  * semantic_search  — dense only (omit sparse), high recall
  * hybrid_search    — dense + BM25 sparse (RRF) + rerank; best for entity queries
  * keyword_search   — lean on the sparse leg
All support a Qdrant `filter` (e.g. lp_id / date_ts range) to pre-filter.

`--demo` runs an entity-heavy query in dense-only vs hybrid to show the BM25
lexical leg surfacing the right LP. The query's sparse vector uses the SAME
encoder as ingest (sparse.encode).
"""
import argparse

import config
import http_util
import sparse


def _search(query, sparse_vec=None, rerank=False, top_k=5, lp_id=None, retrieve_n=80, filt=None):
    body = {"query": query, "collection": config.COLLECTION, "top_k": top_k,
            "retrieve_n": retrieve_n, "fusion": "rrf", "text_field": "text",
            "with_payload": True, "rerank": rerank}
    if sparse_vec is not None:
        body["sparse"] = {"indices": sparse_vec["indices"], "values": sparse_vec["values"]}
    # An explicit raw Qdrant filter (filt) wins; otherwise build one from lp_id.
    if filt is not None:
        body["filter"] = filt
    elif lp_id:
        body["filter"] = {"must": [{"key": "lp_id", "match": {"value": lp_id}}]}
    status, data = http_util.request("POST", f"{config.SPARK_CONTROL_URL}/api/search",
                                     body, verify=config.SPARK_VERIFY_TLS)
    if status != 200:
        raise RuntimeError(f"/api/search -> {status}: {data}")
    return data.get("data", [])


def semantic_search(query, **kw):
    return _search(query, sparse_vec=None, rerank=kw.pop("rerank", False), **kw)


def hybrid_search(query, **kw):
    return _search(query, sparse_vec=sparse.encode(query), rerank=kw.pop("rerank", True), **kw)


def keyword_search(query, **kw):
    return _search(query, sparse_vec=sparse.encode(query), rerank=kw.pop("rerank", True), **kw)


def _row(r):
    p = r.get("payload", {}) or {}
    text = (r.get("text") or p.get("text") or "").replace("\n", " ")
    return f"{p.get('lp_name', '?'):<22} [{p.get('doc_type', '?'):<13}] {text[:58]}"


def _print(title, rows):
    print(f"\n  {title}")
    if not rows:
        print("    (no results)")
    for i, r in enumerate(rows, 1):
        print(f"    {i}. score={r.get('score', 0):+.3f}  {_row(r)}")


def demo():
    target = "Cedar Point Capital"
    q = "Fund III diligence and wire timeline for Cedar Point"
    print(f"QUERY: {q!r}\nTarget LP: {target}")

    dense = semantic_search(q, top_k=5)
    hybrid = hybrid_search(q, top_k=5, rerank=False)   # rerank off to isolate the BM25 leg
    _print("dense-only (semantic):", dense)
    _print("hybrid (dense + BM25 RRF):", hybrid)

    def first_rank(rows):
        for i, r in enumerate(rows, 1):
            if (r.get("payload", {}) or {}).get("lp_name") == target:
                return i
        return None
    print(f"\n  First '{target}' chunk — dense rank: {first_rank(dense)}, hybrid rank: {first_rank(hybrid)}")

    # Pre-filter demo: same query, restricted to one LP's chunks.
    lp_id = None
    for r in hybrid:
        p = r.get("payload", {}) or {}
        if p.get("lp_name") == target:
            lp_id = p.get("lp_id")
            break
    if lp_id:
        _print(f"hybrid + payload pre-filter (lp_id={lp_id}):",
               hybrid_search(q, top_k=5, rerank=True, lp_id=lp_id))


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("query", nargs="?")
    ap.add_argument("--mode", choices=["semantic", "hybrid", "keyword"], default="hybrid")
    ap.add_argument("--top-k", type=int, default=5)
    ap.add_argument("--lp-id")
    ap.add_argument("--demo", action="store_true")
    args = ap.parse_args()
    if args.demo or not args.query:
        return demo()
    fn = {"semantic": semantic_search, "hybrid": hybrid_search, "keyword": keyword_search}[args.mode]
    _print(f"{args.mode}: {args.query!r}", fn(args.query, top_k=args.top_k, lp_id=args.lp_id))


if __name__ == "__main__":
    main()