# Copyright 2025 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import json
import os
import tempfile

import pytest
import typer

from transformers.cli.chat import (
    get_service_root_url,
    new_chat_history,
    parse_generate_flags,
    save_chat,
)


def test_help(cli):
    output = cli("chat", "--help")
    assert output.exit_code == 0
    assert "Chat with a model from the command line." in output.output


def test_save_and_clear_chat():
    with tempfile.TemporaryDirectory() as tmp_path:
        filename = os.path.join(tmp_path, "chat.json")
        save_chat(filename, [{"role": "user", "content": "hi"}], {"foo": "bar"})
        assert os.path.isfile(filename)
        with open(filename, "r", encoding="utf-8") as f:
            data = json.load(f)
            assert data["chat_history"] == [{"role": "user", "content": "hi"}]
            assert data["settings"] == {"foo": "bar"}


def test_new_chat_history():
    assert new_chat_history() == []
    assert new_chat_history("prompt") == [{"role": "system", "content": "prompt"}]


def test_parse_generate_flags():
    parsed = parse_generate_flags(["temperature=0.5", "max_new_tokens=10"])
    assert parsed["temperature"] == 0.5
    assert parsed["max_new_tokens"] == 10


def test_parse_generate_flags_value_with_equal_sign():
    assert parse_generate_flags(["cache_implementation=a=b"]) == {"cache_implementation": "a=b"}


def test_parse_generate_flags_preserves_types_and_quotes():
    assert parse_generate_flags(['text=a"b', "do_sample=False", "eos_token_id=[1,2]", "watermark=None"]) == {
        "text": 'a"b',
        "do_sample": False,
        "eos_token_id": [1, 2],
        "watermark": None,
    }


def test_parse_generate_flags_preserves_lists_with_strings():
    assert parse_generate_flags([r'stop_strings=["a\\b"]']) == {"stop_strings": [r"a\b"]}


@pytest.mark.parametrize("value", [r"a\b", r"a\u0041", r"C:\temp", r"a\x"])
def test_parse_generate_flags_preserves_backslashes(value):
    assert parse_generate_flags([f"stop_strings={value}"]) == {"stop_strings": value}


def test_parse_generate_flags_missing_equal_sign():
    with pytest.raises(typer.BadParameter, match="missing `=` after `do_sample`"):
        parse_generate_flags(["do_sample"])


def test_parse_generate_flags_invalid_json_error_message():
    with pytest.raises(ValueError, match=r"Converted JSON string = \{\"stop_strings\": \[a\]\}"):
        parse_generate_flags(["stop_strings=[a]"])


def test_get_service_root_url():
    assert get_service_root_url("http://localhost:8000/v1") == "http://localhost:8000"
    assert get_service_root_url("http://localhost:8000/v1/") == "http://localhost:8000"
    assert get_service_root_url("http://localhost:8000") == "http://localhost:8000"
    assert get_service_root_url("http://localhost:8000/") == "http://localhost:8000"
    assert get_service_root_url("https://example.com/proxy/v1") == "https://example.com/proxy"