import json
import os
import shutil
import bcrypt
from datetime import datetime

DATA_DIR = "user_data"


def _ensure_dirs():
    os.makedirs(DATA_DIR, exist_ok=True)


def _user_dir(username: str) -> str:
    path = os.path.join(DATA_DIR, username)
    os.makedirs(path, exist_ok=True)
    return path


def _voices_dir(username: str) -> str:
    path = os.path.join(_user_dir(username), "voices")
    os.makedirs(path, exist_ok=True)
    return path


def _files_dir(username: str) -> str:
    path = os.path.join(_user_dir(username), "files")
    os.makedirs(path, exist_ok=True)
    return path


def _users_file() -> str:
    _ensure_dirs()
    return os.path.join(DATA_DIR, "users.json")


def _load_users() -> dict:
    path = _users_file()
    if os.path.exists(path):
        with open(path, "r") as f:
            return json.load(f)
    return {}


def _save_users(users: dict):
    with open(_users_file(), "w") as f:
        json.dump(users, f, indent=2)


def register_user(username: str, password: str) -> tuple[bool, str]:
    if not username or not password:
        return False, "Username and password required"
    if len(username) < 3:
        return False, "Username must be at least 3 characters"
    if len(password) < 6:
        return False, "Password must be at least 6 characters"

    users = _load_users()
    if username.lower() in users:
        return False, "user_exists"

    hashed = bcrypt.hashpw(password.encode(), bcrypt.gensalt()).decode()
    users[username.lower()] = {
        "password_hash": hashed,
        "created": datetime.now().isoformat(),
        "settings": {"app_language": "en", "tts_language": "en", "speed": 1.0},
    }
    _save_users(users)
    _user_dir(username.lower())
    _voices_dir(username.lower())
    _files_dir(username.lower())
    return True, "register_success"


def verify_user(username: str, password: str) -> bool:
    users = _load_users()
    user = users.get(username.lower())
    if not user:
        return False
    return bcrypt.checkpw(password.encode(), user["password_hash"].encode())


def delete_user(username: str, password: str) -> bool:
    if not verify_user(username, password):
        return False
    users = _load_users()
    username = username.lower()
    if username in users:
        del users[username]
        _save_users(users)
    user_path = os.path.join(DATA_DIR, username)
    if os.path.exists(user_path):
        shutil.rmtree(user_path)
    return True


def get_user_settings(username: str) -> dict:
    users = _load_users()
    user = users.get(username.lower(), {})
    return user.get("settings", {"app_language": "en", "tts_language": "en", "speed": 1.0})


def update_user_settings(username: str, settings: dict):
    users = _load_users()
    username = username.lower()
    if username in users:
        users[username]["settings"] = settings
        _save_users(users)


def save_user_file(username: str, filename: str, content: str) -> str:
    files_dir = _files_dir(username.lower())
    meta_path = os.path.join(files_dir, "files_meta.json")

    if os.path.exists(meta_path):
        with open(meta_path, "r") as f:
            meta = json.load(f)
    else:
        meta = {}

    safe_name = "".join(c for c in filename if c.isalnum() or c in "._- ").strip()
    file_id = f"{datetime.now().strftime('%Y%m%d%H%M%S')}_{safe_name}"
    content_path = os.path.join(files_dir, f"{file_id}.txt")

    with open(content_path, "w", encoding="utf-8") as f:
        f.write(content)

    meta[file_id] = {
        "original_name": filename,
        "saved_at": datetime.now().isoformat(),
        "char_count": len(content),
    }
    with open(meta_path, "w") as f:
        json.dump(meta, f, indent=2)

    return file_id


def get_user_files(username: str) -> dict:
    files_dir = _files_dir(username.lower())
    meta_path = os.path.join(files_dir, "files_meta.json")
    if os.path.exists(meta_path):
        with open(meta_path, "r") as f:
            return json.load(f)
    return {}


def load_file_content(username: str, file_id: str) -> str:
    files_dir = _files_dir(username.lower())
    content_path = os.path.join(files_dir, f"{file_id}.txt")
    if os.path.exists(content_path):
        with open(content_path, "r", encoding="utf-8") as f:
            return f.read()
    return ""


def delete_user_file(username: str, file_id: str) -> bool:
    files_dir = _files_dir(username.lower())
    meta_path = os.path.join(files_dir, "files_meta.json")
    content_path = os.path.join(files_dir, f"{file_id}.txt")

    if os.path.exists(meta_path):
        with open(meta_path, "r") as f:
            meta = json.load(f)
        if file_id in meta:
            del meta[file_id]
            with open(meta_path, "w") as f:
                json.dump(meta, f, indent=2)

    if os.path.exists(content_path):
        os.remove(content_path)
        return True
    return False


def save_cloned_voice(username: str, voice_name: str, audio_path: str) -> str:
    voices_dir = _voices_dir(username.lower())
    meta_path = os.path.join(voices_dir, "voices_meta.json")

    if os.path.exists(meta_path):
        with open(meta_path, "r") as f:
            meta = json.load(f)
    else:
        meta = {}

    voice_id = f"{datetime.now().strftime('%Y%m%d%H%M%S')}_{voice_name}"
    ext = os.path.splitext(audio_path)[1]
    voice_file = os.path.join(voices_dir, f"{voice_id}{ext}")
    shutil.copy2(audio_path, voice_file)

    meta[voice_id] = {
        "name": voice_name,
        "file": f"{voice_id}{ext}",
        "created": datetime.now().isoformat(),
    }
    with open(meta_path, "w") as f:
        json.dump(meta, f, indent=2)

    return voice_id


def get_user_voices(username: str) -> dict:
    voices_dir = _voices_dir(username.lower())
    meta_path = os.path.join(voices_dir, "voices_meta.json")
    if os.path.exists(meta_path):
        with open(meta_path, "r") as f:
            return json.load(f)
    return {}


def get_voice_path(username: str, voice_id: str) -> str:
    voices = get_user_voices(username.lower())
    if voice_id in voices:
        voices_dir = _voices_dir(username.lower())
        return os.path.join(voices_dir, voices[voice_id]["file"])
    return ""


def delete_user_voice(username: str, voice_id: str) -> bool:
    voices_dir = _voices_dir(username.lower())
    meta_path = os.path.join(voices_dir, "voices_meta.json")

    if os.path.exists(meta_path):
        with open(meta_path, "r") as f:
            meta = json.load(f)
        if voice_id in meta:
            voice_file = os.path.join(voices_dir, meta[voice_id]["file"])
            if os.path.exists(voice_file):
                os.remove(voice_file)
            del meta[voice_id]
            with open(meta_path, "w") as f:
                json.dump(meta, f, indent=2)
            return True
    return False