"""省钱 endpoint(profile 的「累计帮你省了」「省钱战绩」「省钱明细」)。

路由前缀 `/api/v1/savings`:
  GET  /summary    累计省下 + 订单数 + 平均每单省
  GET  /battle     本周已省 + 超过百分比 + 连续省钱天数
  GET  /records    省钱明细(游标分页)
"""
from __future__ import annotations

import logging

from fastapi import APIRouter, Query

from app.api.deps import CurrentUser, DbSession
from app.repositories import savings as crud_savings
from app.schemas.welfare import (
    SavingsBattleOut,
    SavingsRecordOut,
    SavingsRecordPage,
    SavingsSummaryOut,
)

logger = logging.getLogger("shagua.savings")

router = APIRouter(prefix="/api/v1/savings", tags=["savings"])


@router.get("/summary", response_model=SavingsSummaryOut, summary="累计帮你省了")
def summary(user: CurrentUser, db: DbSession) -> SavingsSummaryOut:
    s = crud_savings.get_summary(db, user.id)
    return SavingsSummaryOut(
        total_saved_cents=s.total_saved_cents,
        order_count=s.order_count,
        avg_saved_cents=s.avg_saved_cents,
    )


@router.get("/battle", response_model=SavingsBattleOut, summary="省钱战绩")
def battle(user: CurrentUser, db: DbSession) -> SavingsBattleOut:
    b = crud_savings.get_battle(db, user.id)
    return SavingsBattleOut(
        week_saved_cents=b.week_saved_cents,
        beat_percent=b.beat_percent,
        streak_days=b.streak_days,
    )


@router.get("/records", response_model=SavingsRecordPage, summary="省钱明细(游标分页)")
def records(
    user: CurrentUser,
    db: DbSession,
    limit: int = Query(20, ge=1, le=100),
    cursor: int | None = Query(None, description="上一页末条 id"),
) -> SavingsRecordPage:
    items, next_cursor = crud_savings.list_records(db, user.id, limit=limit, cursor=cursor)
    return SavingsRecordPage(
        items=[SavingsRecordOut.model_validate(it) for it in items],
        next_cursor=next_cursor,
    )