from fastapi import APIRouter, UploadFile, File, Form, HTTPException
from typing import Optional, List
import cv2
import numpy as np
from PIL import Image
import io
import shutil

from app.core.models_loader import global_models
from app.db.milvus_client import milvus_collection
from app.core.config import settings

router = APIRouter()


@router.post("/image", summary="相似宝可梦图像搜索")
async def search_image(file: UploadFile = File(...), top_k: int = 5):
    # 1. 读取图片
    content = await file.read()
    image = Image.open(io.BytesIO(content)).convert("RGB")
    image_np = np.array(image)

    # 2. YOLO 截取 (单张处理)
    # 注意：MyBatchOnnxYolo 需要 List 输入
    global_models.yolo.predict_batch([image_np])
    # 提取第0张图的 crop (默认 cls_id=0)
    cropped_img = global_models.yolo.get_max_img(0, cls_id=0)

    if cropped_img is None:
        # 如果没检测到，使用原图
        cropped_img = image_np

    # 3. ViT 提取特征
    # MyViTFeatureExtractor 接收 List[Union[str, np.ndarray, Image]]
    vectors = global_models.vit.run([cropped_img], normalize=True)
    query_vector = vectors[0].tolist()

    # 4. Milvus 搜索
    search_params = {"metric_type": "COSINE", "params": {"nprobe": 10}}
    results = milvus_collection.search(
        data=[query_vector],
        anns_field="vector",
        param=search_params,
        limit=top_k,
        output_fields=["id", "img_path", "card_name", "card_num", "lang", "source_id"]
    )

    # 5. 格式化结果
    formatted_results = []
    for hits in results:
        for hit in hits:
            # 将本地路径转换为相对 URL 以便前端访问
            full_path = hit.entity.get("img_path")
            web_path = f"/static/images/{full_path.split('/')[-1]}" if full_path else ""

            formatted_results.append({
                "id": hit.id,
                "score": hit.score,
                "card_name": hit.entity.get("card_name"),
                "card_num": hit.entity.get("card_num"),
                "lang": hit.entity.get("lang"),
                "img_url": web_path
            })

    return {"results": formatted_results}


@router.post("/filter")
async def filter_database(
        card_name: Optional[str] = None,
        source_id: Optional[str] = None,
        limit: int = 20
):
    """数据库元数据过滤"""
    expr_list = []
    if card_name:
        # 模糊查询
        expr_list.append(f'card_name like "{card_name}%"')
    if source_id:
        expr_list.append(f'source_id == "{source_id}"')

    expr = " && ".join(expr_list) if expr_list else ""

    # 如果没有条件，查询所有（慎用，有限制）
    if not expr:
        expr = "id > 0"

    res = milvus_collection.query(
        expr=expr,
        output_fields=["id", "img_path", "card_name", "card_num", "lang"],
        limit=limit
    )

    # 格式化路径
    for item in res:
        full_path = item.pop("img_path", "")
        item["img_url"] = f"/static/images/{full_path.split('/')[-1]}" if full_path else ""

    return {"count": len(res), "data": res}