from fastapi import FastAPI, HTTPException

from config import get_settings
from faiss_manager import faiss_manager
from models import EmbeddingInput, IndexDeleteInput, IndexInsertInput, IndexSearchInput, SearchInput

settings = get_settings()

app = FastAPI(
    title="FAISS 服务",
    description="向量插入 + 相似搜索 + 多索引管理",
    version="1.0.0",
)


def log_business(message: str):
    if settings.ENABLE_REQUEST_LOGS:
        print(message, flush=True)


@app.post("/insert")
async def insert(data: EmbeddingInput):
    try:
        vector_id = faiss_manager.insert(data.embedding)
        log_business(f"[faiss] global insert id={vector_id}")
        return {"id": vector_id}
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc))


@app.post("/search")
async def search(data: SearchInput):
    try:
        result = faiss_manager.search(data.embedding, data.k)
        log_business(f"[faiss] global search ids={result['ids']} similarity_scores={result['similarity_scores']}")
        return result
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc))


@app.post("/create")
async def create():
    try:
        idx = faiss_manager.create()
        log_business(f"[faiss] create idx={idx}")
        return {"idx": idx}
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc))


@app.post("/insert_idx")
async def insert_idx(data: IndexInsertInput):
    try:
        vector_id = faiss_manager.insert_idx(data.idx, data.id, data.embedding)
        log_business(f"[faiss] insert_idx idx={data.idx} id={vector_id}")
        return {"id": vector_id, "idx": data.idx}
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc))


@app.post("/search_idx")
async def search_idx(data: IndexSearchInput):
    try:
        result = faiss_manager.search_idx(data.idx, data.embedding, data.k)
        log_business(f"[faiss] search_idx idx={data.idx} ids={result['ids']} similarity_scores={result['similarity_scores']}")
        return result
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc))


@app.post("/del")
async def delete_idx(data: IndexDeleteInput):
    try:
        faiss_manager.delete(data.idx)
        log_business(f"[faiss] delete idx={data.idx}")
        return {"status": "success", "idx": data.idx}
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc))


@app.post("/persist")
async def persist():
    faiss_manager.persist()
    return {"status": "success", "message": "索引已持久化"}