#!/usr/bin/env python3

import json
import os
import sys
import unicodedata
from typing import Dict, List, Tuple, Any


DEFAULT_GAMES_JSON = os.path.join(
    os.path.dirname(__file__), "steam_library_with_sizes.json"
)
DEFAULT_GAMES_ROOT = "/mnt/nextcloud-hdd/games"
IGNORE_DIRS = {".", "..", "common", "lost+found"}


def normalize(text: str) -> str:
    """Normalize game / directory names for comparison."""
    text = unicodedata.normalize("NFKD", text)
    text = "".join(ch for ch in text if not unicodedata.combining(ch))
    text = text.lower()
    return "".join(ch for ch in text if ch.isalnum())


def load_games(json_path: str) -> List[Dict[str, Any]]:
    with open(json_path, "r", encoding="utf-8") as f:
        data = json.load(f)
    if not isinstance(data, list):
        raise ValueError(f"Unexpected JSON structure in {json_path}, expected list")
    return data


def list_game_dirs(root: str) -> List[str]:
    entries: List[str] = []
    for name in os.listdir(root):
        if name in IGNORE_DIRS or name.startswith("."):
            continue
        full = os.path.join(root, name)
        if os.path.isdir(full):
            entries.append(name)
    return sorted(entries)


def build_dir_index(dirs: List[str]) -> Dict[str, List[str]]:
    index: Dict[str, List[str]] = {}
    for d in dirs:
        nd = normalize(d)
        index.setdefault(nd, []).append(d)
    return index


def similar_candidates(
    norm_name: str, dirs: List[str]
) -> Tuple[float, List[str]]:
    from difflib import SequenceMatcher

    best_ratio = 0.0
    best: List[str] = []
    for d in dirs:
        nd = normalize(d)
        ratio = SequenceMatcher(None, norm_name, nd).ratio()
        if ratio > best_ratio:
            best_ratio = ratio
            best = [d]
        elif ratio == best_ratio and ratio > 0:
            best.append(d)
    return best_ratio, best


def classify_games(
    games: List[Dict[str, Any]], server_dirs: List[str]
) -> Tuple[List[Dict[str, Any]], List[Dict[str, Any]], Dict[str, int]]:
    norm_dir_map = build_dir_index(server_dirs)

    missing: List[Dict[str, Any]] = []
    doubtful: List[Dict[str, Any]] = []

    for g in games:
        appid = str(g.get("appid", ""))
        name = g.get("name", "")
        norm_name = normalize(name)

        candidates = norm_dir_map.get(norm_name, [])
        if len(candidates) == 1:
            # Confident уникальное соответствие: игра считается присутствующей
            continue

        record = {
            "appid": appid,
            "name": name,
            "attempted_match": False,
            "reason": "",
        }

        if len(candidates) > 1:
            record["attempted_match"] = True
            record[
                "reason"
            ] = f"Найдено несколько директорий с одинаковым нормализованным именем: {candidates}"
            missing.append(record)
            doubtful.append(
                {
                    "appid": appid,
                    "name": name,
                    "candidates": candidates,
                    "confidence": "низкая уверенность (несколько совпадений по нормализованному имени)",
                }
            )
            continue

        # Нет точного совпадения по нормализованному имени: ищем похожие директории,
        # но не считаем их найденными.
        best_ratio, best_matches = similar_candidates(norm_name, server_dirs)

        if best_ratio >= 0.85:
            record["attempted_match"] = True
            record["reason"] = (
                "Найден(ы) похожие директории, но совпадение не однозначное "
                f"(коэффициент схожести {best_ratio:.2f}, кандидаты: {best_matches})"
            )
            if best_ratio >= 0.92:
                conf = "вероятно совпадение"
            else:
                conf = "низкая уверенность"
            doubtful.append(
                {
                    "appid": appid,
                    "name": name,
                    "candidates": best_matches,
                    "confidence": f"{conf} (similarity={best_ratio:.2f})",
                }
            )
        else:
            record[
                "reason"
            ] = "Похожих директорий не найдено (по нормализованному имени)"

        missing.append(record)

    stats = {
        "total_games_in_json": len(games),
        "total_server_dirs": len(server_dirs),
        "missing_count": len(missing),
        "doubtful_count": len(doubtful),
    }
    return missing, doubtful, stats


def print_markdown(
    missing: List[Dict[str, Any]], doubtful: List[Dict[str, Any]], stats: Dict[str, int]
) -> None:
    print("### Статистика")
    print()
    print(f"- **Всего игр в JSON**: {stats['total_games_in_json']}")
    print(f"- **Всего директорий на сервере**: {stats['total_server_dirs']}")
    print(f"- **Отсутствующие игры**: {stats['missing_count']}")
    print(f"- **Сомнительные сопоставления**: {stats['doubtful_count']}")
    print()

    print("### Игры, отсутствующие на сервере")
    print()
    if not missing:
        print("Все игры из JSON найдены на сервере по строгому сопоставлению.")
    else:
        print("| appid | name | попытка сопоставления | комментарий |")
        print("| --- | --- | --- | --- |")
        for r in missing:
            attempted = "да" if r["attempted_match"] else "нет"
            reason = r.get("reason", "").replace("\n", " ")
            print(f"| {r['appid']} | {r['name']} | {attempted} | {reason} |")
    print()

    print("### Сомнительные/неоднозначные сопоставления")
    print()
    if not doubtful:
        print("Сомнительных сопоставлений не обнаружено.")
        return

    print("| appid | name | директории-кандидаты | степень уверенности |")
    print("| --- | --- | --- | --- |")
    for d in doubtful:
        candidates = ", ".join(d.get("candidates") or [])
        conf = d.get("confidence", "")
        print(f"| {d['appid']} | {d['name']} | {candidates} | {conf} |")


def main(argv: List[str]) -> int:
    games_json = DEFAULT_GAMES_JSON
    games_root = DEFAULT_GAMES_ROOT

    if len(argv) > 1:
        games_json = argv[1]
    if len(argv) > 2:
        games_root = argv[2]

    if not os.path.isfile(games_json):
        print(f"ERROR: JSON file not found: {games_json}", file=sys.stderr)
        return 1
    if not os.path.isdir(games_root):
        print(f"ERROR: Games root not found: {games_root}", file=sys.stderr)
        return 1

    games = load_games(games_json)
    server_dirs = list_game_dirs(games_root)
    missing, doubtful, stats = classify_games(games, server_dirs)
    print_markdown(missing, doubtful, stats)
    return 0


if __name__ == "__main__":
    raise SystemExit(main(sys.argv))