import argparse
from pathlib import Path

from ..completions import (
    add_dynamic_completer,
    complete_secrets,
    complete_users,
)
from ..errors import ClanError
from ..git import commit_files
from . import secrets
from .folders import list_objects, remove_object, sops_users_folder
from .secrets import update_secrets
from .sops import read_key, write_key
from .types import (
    VALID_USER_NAME,
    public_or_private_age_key_type,
    secret_name_type,
    user_name_type,
)


def add_user(flake_dir: Path, name: str, key: str, force: bool) -> None:
    path = sops_users_folder(flake_dir) / name

    def filter_user_secrets(secret: Path) -> bool:
        return secret.joinpath("users", name).exists()

    write_key(path, key, force)
    paths = [path]
    paths.extend(update_secrets(flake_dir, filter_secrets=filter_user_secrets))
    commit_files(
        paths,
        flake_dir,
        f"Add user {name} to secrets",
    )


def remove_user(flake_dir: Path, name: str) -> None:
    removed_paths = remove_object(sops_users_folder(flake_dir), name)
    commit_files(
        removed_paths,
        flake_dir,
        f"Remove user {name}",
    )


def get_user(flake_dir: Path, name: str) -> str:
    return read_key(sops_users_folder(flake_dir) / name)


def list_users(flake_dir: Path) -> list[str]:
    path = sops_users_folder(flake_dir)

    def validate(name: str) -> bool:
        return (
            VALID_USER_NAME.match(name) is not None
            and (path / name / "key.json").exists()
        )

    return list_objects(path, validate)


def add_secret(flake_dir: Path, user: str, secret: str) -> None:
    updated_paths = secrets.allow_member(
        secrets.users_folder(flake_dir, secret), sops_users_folder(flake_dir), user
    )
    commit_files(
        updated_paths,
        flake_dir,
        f"Add {user} to secret",
    )


def remove_secret(flake_dir: Path, user: str, secret: str) -> None:
    updated_paths = secrets.disallow_member(
        secrets.users_folder(flake_dir, secret), user
    )
    commit_files(
        updated_paths,
        flake_dir,
        f"Remove {user} from secret",
    )


def list_command(args: argparse.Namespace) -> None:
    if args.flake is None:
        raise ClanError("Could not find clan flake toplevel directory")
    lst = list_users(args.flake.path)
    if len(lst) > 0:
        print("\n".join(lst))


def add_command(args: argparse.Namespace) -> None:
    if args.flake is None:
        raise ClanError("Could not find clan flake toplevel directory")
    add_user(args.flake.path, args.user, args.key, args.force)


def get_command(args: argparse.Namespace) -> None:
    if args.flake is None:
        raise ClanError("Could not find clan flake toplevel directory")
    print(get_user(args.flake.path, args.user))


def remove_command(args: argparse.Namespace) -> None:
    if args.flake is None:
        raise ClanError("Could not find clan flake toplevel directory")
    remove_user(args.flake.path, args.user)


def add_secret_command(args: argparse.Namespace) -> None:
    if args.flake is None:
        raise ClanError("Could not find clan flake toplevel directory")
    add_secret(args.flake.path, args.user, args.secret)


def remove_secret_command(args: argparse.Namespace) -> None:
    if args.flake is None:
        raise ClanError("Could not find clan flake toplevel directory")
    remove_secret(args.flake.path, args.user, args.secret)


def register_users_parser(parser: argparse.ArgumentParser) -> None:
    subparser = parser.add_subparsers(
        title="command",
        description="the command to run",
        help="the command to run",
        required=True,
    )
    list_parser = subparser.add_parser("list", help="list users")
    list_parser.set_defaults(func=list_command)

    add_parser = subparser.add_parser("add", help="add a user")
    add_parser.add_argument(
        "-f", "--force", help="overwrite existing user", action="store_true"
    )
    add_parser.add_argument("user", help="the name of the user", type=user_name_type)
    add_parser.add_argument(
        "key",
        help="public key or private key of the user."
        "Execute 'clan secrets key --help' on how to retrieve a key."
        "To fetch an age key from an SSH host key: ssh-keyscan <domain_name> | nix shell nixpkgs#ssh-to-age -c ssh-to-age",
        type=public_or_private_age_key_type,
    )
    add_parser.set_defaults(func=add_command)

    get_parser = subparser.add_parser("get", help="get a user public key")
    get_user_action = get_parser.add_argument(
        "user", help="the name of the user", type=user_name_type
    )
    add_dynamic_completer(get_user_action, complete_users)
    get_parser.set_defaults(func=get_command)

    remove_parser = subparser.add_parser("remove", help="remove a user")
    remove_user_action = remove_parser.add_argument(
        "user", help="the name of the user", type=user_name_type
    )
    add_dynamic_completer(remove_user_action, complete_users)
    remove_parser.set_defaults(func=remove_command)

    add_secret_parser = subparser.add_parser(
        "add-secret", help="allow a user to access a secret"
    )
    add_secret_user_action = add_secret_parser.add_argument(
        "user", help="the name of the user", type=user_name_type
    )
    add_dynamic_completer(add_secret_user_action, complete_users)
    add_secrets_action = add_secret_parser.add_argument(
        "secret", help="the name of the secret", type=secret_name_type
    )
    add_dynamic_completer(add_secrets_action, complete_secrets)
    add_secret_parser.set_defaults(func=add_secret_command)

    remove_secret_parser = subparser.add_parser(
        "remove-secret", help="remove a user's access to a secret"
    )
    remove_secret_user_action = remove_secret_parser.add_argument(
        "user", help="the name of the group", type=user_name_type
    )
    add_dynamic_completer(remove_secret_user_action, complete_users)
    remove_secrets_action = remove_secret_parser.add_argument(
        "secret", help="the name of the secret", type=secret_name_type
    )
    add_dynamic_completer(remove_secrets_action, complete_secrets)
    remove_secret_parser.set_defaults(func=remove_secret_command)