"""Player homepage aggregates (career / recent20 / heroes / activity / peers).

Pure helpers used by pc/player_pages.py. Not used by recommend / item_suggest.
"""

from __future__ import annotations

from typing import Any


def _int(v: Any, default: int = 0) -> int:
    try:
        return int(v)
    except (TypeError, ValueError):
        return default


def _float(v: Any, default: float = 0.0) -> float:
    try:
        return float(v)
    except (TypeError, ValueError):
        return default


def kda(kills: int, deaths: int, assists: int) -> float:
    return round((kills + assists) / max(deaths, 1), 1)


def winrate(wins: int, losses: int) -> float | None:
    total = wins + losses
    if total <= 0:
        return None
    return round(wins / total * 1000) / 10


def aggregate_from_rows(rows: list[dict], *, limit: int | None = None) -> dict:
    """Aggregate match summary rows into a stats snapshot."""
    sample = list(rows)
    if limit is not None:
        sample = sample[: max(0, limit)]
    wins = 0
    losses = 0
    kills = deaths = assists = 0
    gpm_sum = xpm_sum = dmg_sum = 0
    gpm_n = xpm_n = dmg_n = 0
    heroes: list[dict] = []
    for r in sample:
        if not isinstance(r, dict):
            continue
        if r.get("won"):
            wins += 1
        else:
            losses += 1
        k = _int(r.get("kills"))
        d = _int(r.get("deaths"))
        a = _int(r.get("assists"))
        kills += k
        deaths += d
        assists += a
        if r.get("gpm") is not None:
            gpm_sum += _int(r.get("gpm"))
            gpm_n += 1
        if r.get("xpm") is not None:
            xpm_sum += _int(r.get("xpm"))
            xpm_n += 1
        if r.get("hero_damage") is not None:
            dmg_sum += _int(r.get("hero_damage"))
            dmg_n += 1
        heroes.append(
            {
                "match_id": _int(r.get("match_id")),
                "hero_id": r.get("hero_id"),
                "hero_key": r.get("hero_key"),
                "hero_name_loc": r.get("hero_name_loc"),
                "won": bool(r.get("won")),
            }
        )
    n = wins + losses
    out = {
        "sample": n,
        "wins": wins,
        "losses": losses,
        "winrate": winrate(wins, losses),
        "kills": kills,
        "deaths": deaths,
        "assists": assists,
        "kda": kda(kills, deaths, assists) if n else None,
        "avg_kills": round(kills / n, 1) if n else None,
        "avg_deaths": round(deaths / n, 1) if n else None,
        "avg_assists": round(assists / n, 1) if n else None,
        "avg_gpm": round(gpm_sum / gpm_n) if gpm_n else None,
        "avg_xpm": round(xpm_sum / xpm_n) if xpm_n else None,
        "avg_hero_damage": round(dmg_sum / dmg_n) if dmg_n else None,
        "heroes": heroes,
    }
    return out


def career_from_opendota(wl: dict | None, totals: list | None) -> dict | None:
    """Build career block from OpenDota /wl + /totals. None when empty/private."""
    wl = wl if isinstance(wl, dict) else {}
    wins = _int(wl.get("win"))
    losses = _int(wl.get("lose"))
    if wins <= 0 and losses <= 0:
        return None
    by_field: dict[str, dict] = {}
    if isinstance(totals, list):
        for row in totals:
            if isinstance(row, dict) and row.get("field"):
                by_field[str(row["field"])] = row
    def sum_of(field: str) -> int:
        return _int((by_field.get(field) or {}).get("sum"))

    def n_of(field: str) -> int:
        return _int((by_field.get(field) or {}).get("n"))

    n = wins + losses
    kills = sum_of("kills")
    deaths = sum_of("deaths")
    assists = sum_of("assists")
    gpm_n = n_of("gold_per_min")
    xpm_n = n_of("xp_per_min")
    dmg_n = n_of("hero_damage")
    return {
        "games": n,
        "wins": wins,
        "losses": losses,
        "winrate": winrate(wins, losses),
        "kills": kills,
        "deaths": deaths,
        "assists": assists,
        "kda": kda(kills, deaths, assists) if n else None,
        "avg_kills": round(kills / n, 1) if n else None,
        "avg_deaths": round(deaths / n, 1) if n else None,
        "avg_assists": round(assists / n, 1) if n else None,
        "avg_gpm": round(sum_of("gold_per_min") / gpm_n) if gpm_n else None,
        "avg_xpm": round(sum_of("xp_per_min") / xpm_n) if xpm_n else None,
        "avg_hero_damage": round(sum_of("hero_damage") / dmg_n) if dmg_n else None,
        "source": "opendota",
    }


def top_heroes_from_opendota(
    rows: list | None,
    *,
    hero_lookup: dict[int, dict],
    limit: int = 5,
) -> list[dict]:
    if not isinstance(rows, list):
        return []
    scored: list[tuple[int, dict]] = []
    for row in rows:
        if not isinstance(row, dict):
            continue
        games = _int(row.get("games"))
        if games <= 0:
            continue
        hid = _int(row.get("hero_id"))
        hero = hero_lookup.get(hid) or {}
        wins = _int(row.get("win"))
        last = row.get("last_played")
        try:
            last_i = int(last) if last is not None else None
        except (TypeError, ValueError):
            last_i = None
        scored.append(
            (
                games,
                {
                    "hero_id": hid or None,
                    "hero_key": hero.get("key"),
                    "hero_name_loc": hero.get("name_loc") or hero.get("key"),
                    "games": games,
                    "wins": wins,
                    "winrate": winrate(wins, max(0, games - wins)),
                    "last_played": last_i,
                },
            )
        )
    scored.sort(key=lambda t: (-t[0], -(_int(t[1].get("last_played")))))
    return [item for _, item in scored[: max(1, limit)]]


def peers_from_opendota(rows: list | None, *, limit: int = 8) -> list[dict]:
    if not isinstance(rows, list):
        return []
    out: list[dict] = []
    for row in rows:
        if not isinstance(row, dict):
            continue
        aid = _int(row.get("account_id"))
        games = _int(row.get("games"))
        if aid <= 0 or games <= 0:
            continue
        wins = _int(row.get("win"))
        name = row.get("personaname")
        if not isinstance(name, str) or not name.strip():
            name = f"玩家 {aid}"
        avatar = row.get("avatarfull") or row.get("avatar")
        if not isinstance(avatar, str):
            avatar = None
        out.append(
            {
                "account_id": aid,
                "personaname": name.strip(),
                "avatar": avatar,
                "games": games,
                "wins": wins,
                "winrate": winrate(wins, max(0, games - wins)),
            }
        )
        if len(out) >= limit:
            break
    return out


def activity_from_matches(rows: list | None, *, days: int = 180) -> dict | None:
    """Build 180-day activity heatmap + sample highs from OpenDota /matches."""
    if not isinstance(rows, list) or not rows:
        return None
    by_day: dict[str, dict] = {}
    max_kills = max_assists = max_gpm = None
    wins = losses = 0
    for row in rows:
        if not isinstance(row, dict):
            continue
        st = row.get("start_time")
        try:
            st_i = int(st) if st is not None else 0
        except (TypeError, ValueError):
            st_i = 0
        if st_i <= 0:
            continue
        # UTC day key YYYY-MM-DD
        from datetime import datetime, timezone

        day = datetime.fromtimestamp(st_i, tz=timezone.utc).strftime("%Y-%m-%d")
        cell = by_day.setdefault(day, {"games": 0, "wins": 0})
        cell["games"] += 1
        player_slot = _int(row.get("player_slot"))
        radiant_win = bool(row.get("radiant_win"))
        won = radiant_win if player_slot < 128 else not radiant_win
        if won:
            cell["wins"] += 1
            wins += 1
        else:
            losses += 1
        kills = _int(row.get("kills"))
        assists = _int(row.get("assists"))
        gpm = _int(row.get("gold_per_min"))
        hero_id = _int(row.get("hero_id")) or None
        if max_kills is None or kills > max_kills["value"]:
            max_kills = {"value": kills, "hero_id": hero_id, "match_id": _int(row.get("match_id"))}
        if max_assists is None or assists > max_assists["value"]:
            max_assists = {
                "value": assists,
                "hero_id": hero_id,
                "match_id": _int(row.get("match_id")),
            }
        if gpm > 0 and (max_gpm is None or gpm > max_gpm["value"]):
            max_gpm = {"value": gpm, "hero_id": hero_id, "match_id": _int(row.get("match_id"))}
    days_list = [
        {"date": d, "games": v["games"], "wins": v["wins"]}
        for d, v in sorted(by_day.items())
    ]
    return {
        "days": days,
        "sample": wins + losses,
        "wins": wins,
        "losses": losses,
        "winrate": winrate(wins, losses),
        "heatmap": days_list,
        "highs": {
            "kills": max_kills,
            "assists": max_assists,
            "gpm": max_gpm,
        },
        "label": f"最近 {days} 天样本",
    }


def merge_availability(
    *,
    opendota_recent_n: int,
    career: dict | None,
    steam_history_status: int | None,
    fetched_at: str,
) -> dict:
    """Describe whether match history is public / syncing / private."""
    od_public = opendota_recent_n > 0 or bool(career and career.get("games"))
    steam_allowed = steam_history_status in (1,)  # 1 = success
    steam_denied = steam_history_status == 15
    if od_public:
        status = "public"
        complete = True
        note = None
    elif steam_allowed and not od_public:
        status = "syncing"
        complete = False
        note = "Steam 已公开，OpenDota 同步中"
    elif steam_denied:
        status = "private"
        complete = False
        note = "未公开比赛数据"
    else:
        status = "unknown"
        complete = False
        note = "暂无公开战绩"
    return {
        "status": status,
        "complete": complete,
        "opendota_public": od_public,
        "steam_history_status": steam_history_status,
        "source": "opendota+steam",
        "fetched_at": fetched_at,
        "note": note,
        "stale": False,
    }


def should_keep_old_career(old: dict | None, new: dict | None) -> dict | None:
    """HTTP 200 empty must not wipe a previously populated career."""
    if new:
        return new
    if old and isinstance(old, dict) and _int(old.get("games")) > 0:
        return old
    return new