"""로또 자가학습 백테스트 — 순수 연산 (FastAPI 의존성 0, Windows 이전 대비)."""
import random
from typing import Any, Dict, List, Optional, Tuple

from .analyzer import build_analysis_cache, build_number_weights, score_combination
from .utils import weighted_sample_6
from .weight_evolver import count_match


def grade_tickets(tickets: List[List[int]], winning6: List[int], bonus: int) -> Dict[str, Any]:
    """티켓 묶음을 당첨번호로 채점 → 매칭 히스토그램 + 보너스 + best_match.
    2등 판정: 5일치 AND 보너스 번호를 티켓이 포함."""
    win = set(winning6)
    hist = {"m3": 0, "m4": 0, "m5": 0, "m6": 0, "bonus_hits": 0}
    best = 0
    for t in tickets:
        c = len(set(t) & win)
        if c > best:
            best = c
        if c == 6:
            hist["m6"] += 1
        elif c == 5:
            hist["m5"] += 1
            if bonus in t:
                hist["bonus_hits"] += 1
        elif c == 4:
            hist["m4"] += 1
        elif c == 3:
            hist["m3"] += 1
    return {**hist, "best_match": best}


def prize_counts(hist: Dict[str, Any]) -> Dict[str, int]:
    """매칭 히스토그램 → 등수 카운트.
    1등=m6, 2등=bonus_hits, 3등=m5−bonus_hits, 4등=m4, 5등=m3."""
    return {
        "1st": hist.get("m6", 0),
        "2nd": hist.get("bonus_hits", 0),
        "3rd": hist.get("m5", 0) - hist.get("bonus_hits", 0),
        "4th": hist.get("m4", 0),
        "5th": hist.get("m3", 0),
    }


def generate_pool(cache, number_weights, n: int = 20000,
                  seed: Optional[int] = None) -> List[List[int]]:
    """가중 샘플링으로 distinct 후보 풀 생성."""
    if seed is not None:
        random.seed(seed)
    seen, pool = set(), []
    attempts, cap = 0, n * 4
    while len(pool) < n and attempts < cap:
        attempts += 1
        nums = tuple(sorted(weighted_sample_6(number_weights)))
        if nums in seen:
            continue
        seen.add(nums)
        pool.append(list(nums))
    return pool


def purchase_tickets(pool, cache, W: List[float], k: int) -> List[List[int]]:
    """풀을 score_combination(·, W)로 랭킹 → 상위 k장 distinct."""
    ranked = sorted(pool, key=lambda t: -score_combination(t, cache, W)["score_total"])
    return ranked[:k]


def random_null_tickets(k: int, seed: Optional[int] = None) -> List[List[int]]:
    """무작위 distinct 티켓 k장 (null-model 대조군)."""
    if seed is not None:
        random.seed(seed)
    seen, out = set(), []
    while len(out) < k:
        nums = tuple(sorted(random.sample(range(1, 46), 6)))
        if nums in seen:
            continue
        seen.add(nums)
        out.append(list(nums))
    return out


def coverage_tickets(k: int, seed: Optional[int] = None) -> List[List[int]]:
    """greedy 커버리지 — 아직 덜 쓰인 번호를 우선 배치해 번호를 넓게 분산.
    (휠링/보장설계는 향후. 현재는 distinct + 번호 사용 균등화)"""
    if seed is not None:
        random.seed(seed)
    usage = {n: 0 for n in range(1, 46)}
    seen, out = set(), []
    guard = 0
    while len(out) < k and guard < k * 50:
        guard += 1
        ranked = sorted(range(1, 46), key=lambda n: (usage[n], random.random()))
        nums = tuple(sorted(ranked[:6]))
        if nums in seen:
            # 동점 흔들기: 약간 더 깊은 풀에서 샘플
            nums = tuple(sorted(random.sample(ranked[:12], 6)))
            if nums in seen:
                continue
        seen.add(nums)
        out.append(list(nums))
        for n in nums:
            usage[n] += 1
    return out