import hashlib
import json
import os
from datetime import datetime, timezone

from src.envs import API, TEAMS_PATH, TEAMS_REPO


def hash_token(token: str) -> str:
    return hashlib.sha256(token.encode()).hexdigest()


def ensure_teams_dir():
    os.makedirs(TEAMS_PATH, exist_ok=True)


def register_team(team_name: str, num_teammates: int, token: str) -> dict:
    ensure_teams_dir()

    token_hash = hash_token(token)
    team_data = {
        "team_name": team_name,
        "num_teammates": num_teammates,
        "token_hash": token_hash,
        "created_at": datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ"),
    }

    team_file = os.path.join(TEAMS_PATH, f"{team_name}.json")

    if os.path.exists(team_file):
        with open(team_file, "r") as f:
            existing = json.load(f)
        if existing.get("token_hash") != token_hash:
            raise ValueError("Team name already exists with different token")
        return existing

    with open(team_file, "w") as f:
        json.dump(team_data, f)

    try:
        API.upload_file(
            path_or_fileobj=team_file,
            path_in_repo=f"{team_name}.json",
            repo_id=TEAMS_REPO,
            repo_type="dataset",
            commit_message=f"Register team: {team_name}",
        )
    except Exception as e:
        print(f"Warning: Could not upload team registration to hub: {e}")

    return team_data


def get_team_by_token(token: str) -> dict | None:
    ensure_teams_dir()
    token_hash = hash_token(token)

    for filename in os.listdir(TEAMS_PATH):
        if not filename.endswith(".json"):
            continue
        filepath = os.path.join(TEAMS_PATH, filename)
        try:
            with open(filepath, "r") as f:
                team_data = json.load(f)
                if team_data.get("token_hash") == token_hash:
                    return team_data
        except Exception:
            continue
    return None


def get_all_teams() -> list[dict]:
    ensure_teams_dir()
    teams = []

    for filename in os.listdir(TEAMS_PATH):
        if not filename.endswith(".json"):
            continue
        filepath = os.path.join(TEAMS_PATH, filename)
        try:
            with open(filepath, "r") as f:
                teams.append(json.load(f))
        except Exception:
            continue

    return teams


def update_last_valid_submission(team_name: str) -> None:
    ensure_teams_dir()
    team_file = os.path.join(TEAMS_PATH, f"{team_name}.json")

    if not os.path.exists(team_file):
        return

    with open(team_file, "r") as f:
        team_data = json.load(f)

    team_data["last_valid_submission"] = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")

    with open(team_file, "w") as f:
        json.dump(team_data, f)

    try:
        API.upload_file(
            path_or_fileobj=team_file,
            path_in_repo=f"{team_name}.json",
            repo_id=TEAMS_REPO,
            repo_type="dataset",
            commit_message=f"Update last submission for team: {team_name}",
        )
    except Exception as e:
        print(f"Warning: Could not upload team update to hub: {e}")


def get_team_by_name(team_name: str) -> dict | None:
    ensure_teams_dir()
    team_file = os.path.join(TEAMS_PATH, f"{team_name}.json")

    if not os.path.exists(team_file):
        return None

    try:
        with open(team_file, "r") as f:
            return json.load(f)
    except Exception:
        return None