# Copyright (c) 2021, Andrew Pantuso (@ajpantuso) <ajpantuso@gmail.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations

from ansible.errors import (
    AnsibleError,
    AnsibleFilterError,
)

from ansible.module_utils.common.collections import is_sequence

try:
    from ansible.errors import AnsibleTypeError
except ImportError:
    from ansible.errors import AnsibleFilterTypeError as AnsibleTypeError  # type: ignore

try:
    from hashids import Hashids

    HAS_HASHIDS = True
except ImportError:
    HAS_HASHIDS = False


def initialize_hashids(**kwargs):
    if not HAS_HASHIDS:
        raise AnsibleError("The hashids library must be installed in order to use this plugin")

    params = {k: v for k, v in kwargs.items() if v}

    try:
        return Hashids(**params)
    except TypeError as e:
        str_params = ", ".join([f"{k}={v}" for k, v in params.items()])
        raise AnsibleFilterError(f"The provided parameters {str_params} are invalid: {e}") from e


def hashids_encode(nums, salt=None, alphabet=None, min_length=None):
    """Generates a YouTube-like hash from a sequence of ints

    :nums: Sequence of one or more ints to hash
    :salt: String to use as salt when hashing
    :alphabet: String of 16 or more unique characters to produce a hash
    :min_length: Minimum length of hash produced
    """

    hashids = initialize_hashids(salt=salt, alphabet=alphabet, min_length=min_length)

    # Handles the case where a single int is not encapsulated in a list or tuple.
    # User convenience seems preferable to strict typing in this case
    # Also avoids obfuscated error messages related to single invalid inputs
    if not is_sequence(nums):
        nums = [nums]

    try:
        hashid = hashids.encode(*nums)
    except TypeError as e:
        raise AnsibleTypeError(f"Data to encode must by a tuple or list of ints: {e}") from e

    return hashid


def hashids_decode(hashid, salt=None, alphabet=None, min_length=None):
    """Decodes a YouTube-like hash to a sequence of ints

    :hashid: Hash string to decode
    :salt: String to use as salt when hashing
    :alphabet: String of 16 or more unique characters to produce a hash
    :min_length: Minimum length of hash produced
    """

    hashids = initialize_hashids(salt=salt, alphabet=alphabet, min_length=min_length)
    nums = hashids.decode(hashid)
    return list(nums)


class FilterModule:
    def filters(self):
        return {
            "hashids_encode": hashids_encode,
            "hashids_decode": hashids_decode,
        }