"""采集入库：插件上传文本 + 图片 URL，落库后异步转存。"""
from __future__ import annotations

import re
from uuid import UUID

from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from db import get_db, get_session_factory
from models import (
    Product, ProductAsset,
    STATUS_PENDING, STATUS_DOWNLOADING, STATUS_OK, STATUS_FAILED, STAGE_COLLECTED,
)
from schemas import MaterialsRequest, MaterialsResponse, TextMaterial
from services import storage

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


def _parse_number(text: str | None) -> float | None:
    """'1 290 ₽' / '￥36.80' → 1290.0 / 36.8"""
    if not text:
        return None
    m = re.search(r"(\d+(?:[.,]\d+)?)", text.replace(" ", "").replace(",", "."))
    return float(m.group(1)) if m else None


def _apply_texts(product: Product, texts: list[TextMaterial]) -> None:
    raw = dict(product.raw or {})
    raw_texts: list[dict] = list(raw.get("texts") or [])
    for t in texts:
        raw_texts.append({"kind": t.kind, "content": t.content, "pairs": t.pairs})
        if t.kind == "title" and t.content and not product.name:
            product.name = t.content
            raw["title"] = t.content
        elif t.kind == "price":
            raw["price"] = t.content
            num = _parse_number(t.content)
            if num is not None and (product.price is None or product.price == 0):
                product.price = num
        elif t.kind == "params" and t.pairs:
            # 与已有参数按 key 并集合并（跨页追加时同一参数不重复）
            merged = {p["key"]: p["value"] for p in (raw.get("params") or [])}
            for p in t.pairs:
                merged.setdefault(p["key"], p["value"])
            raw["params"] = [{"key": k, "value": v} for k, v in merged.items()]
        elif t.kind == "selling_point":
            raw["sellingPoints"] = t.content
        elif t.kind == "desc":
            raw["desc"] = t.content
            if not product.description:
                product.description = t.content
        elif t.kind == "brand":
            raw["brand"] = t.content
    raw["texts"] = raw_texts
    product.raw = raw


async def _get_or_create_product(db: AsyncSession, req: MaterialsRequest) -> Product:
    if req.product_id:
        product = await db.get(Product, UUID(req.product_id))
        if product is None:
            raise HTTPException(status_code=404, detail="商品不存在")
        return product
    product = Product(
        stage=STAGE_COLLECTED,
        source_platform=req.source.platform,
        source_item_id=req.source.itemId,
        source_url=req.source.url,
    )
    db.add(product)
    await db.flush()
    return product


@router.post("/materials", response_model=MaterialsResponse)
async def create_materials(
    req: MaterialsRequest,
    background: BackgroundTasks,
    db: AsyncSession = Depends(get_db),
) -> MaterialsResponse:
    product = await _get_or_create_product(db, req)
    _apply_texts(product, req.texts)

    if not product.source_url:
        product.source_url = req.source.url
    if not product.source_platform:
        product.source_platform = req.source.platform

    # 去重 + 建素材
    existing: set[str] = set()
    if req.images:
        rows = (await db.execute(
            select(ProductAsset.dedupe_key).where(
                ProductAsset.product_id == product.id,
                ProductAsset.dedupe_key.isnot(None),
            )
        )).scalars().all()
        existing = {k for k in rows if k}

    queued, skipped = 0, 0
    for img in req.images:
        if img.dedupeKey and img.dedupeKey in existing:
            skipped += 1
            continue
        db.add(ProductAsset(
            product_id=product.id,
            group_key=img.groupKey,
            variant_name=img.variantName,
            sort_order=img.index,
            type=img.type,
            source_url=img.url,
            status=STATUS_PENDING,
            dedupe_key=img.dedupeKey,
        ))
        if img.dedupeKey:
            existing.add(img.dedupeKey)
        queued += 1

    # 更新分组计数
    counts: dict = {}
    for a in await db.scalars(select(ProductAsset).where(ProductAsset.product_id == product.id)):
        counts[a.group_key] = counts.get(a.group_key, 0) + 1
    product.asset_counts = counts

    await db.commit()
    await db.refresh(product)

    if queued:
        background.add_task(process_product_assets, str(product.id))
    return MaterialsResponse(product_id=str(product.id), assets_queued=queued, assets_skipped=skipped)


async def process_product_assets(product_id: str) -> None:
    """后台：下载 pending 素材 → 转存本地 media。失败逐张标记，不中断。"""
    async with get_session_factory()() as db:
        assets = (await db.scalars(
            select(ProductAsset).where(
                ProductAsset.product_id == UUID(product_id),
                ProductAsset.status == STATUS_PENDING,
                ProductAsset.type == "img",
            )
        )).all()
        for a in assets:
            a.status = STATUS_DOWNLOADING
            await db.commit()
            try:
                a.stored_url = await storage.save_from_url(a.source_url, key_prefix="assets")
                a.status = STATUS_OK
            except Exception as exc:  # noqa: BLE001
                a.status = STATUS_FAILED
                a.error = str(exc)[:500]
            await db.commit()


@router.get("/collected")
async def is_collected(platform: str, itemId: str, db: AsyncSession = Depends(get_db)):
    rows = (await db.execute(
        select(Product.id).where(
            Product.source_platform == platform,
            Product.source_item_id == itemId,
        )
    )).scalars().all()
    return {"collected": len(rows) > 0, "count": len(rows)}