import os
import sys
from io import StringIO
from unittest import mock

import pytest

from redmine_reporter.cli import main, parse_date_range

VALID_ENV = {
    "REDMINE_URL": "https://red.eltex.loc",
    "REDMINE_API_KEY": "token",
}


@pytest.mark.parametrize(
    "date_arg, expected",
    [
        ("2026-01-01--2026-01-31", ("2026-01-01", "2026-01-31")),
        (" 2026-01-01 -- 2026-01-31 ", ("2026-01-01", "2026-01-31")),
    ],
)
def test_parse_date_range_valid(date_arg, expected):
    assert parse_date_range(date_arg) == expected


@pytest.mark.parametrize(
    "date_arg",
    [
        "20260101-20260131",
        "2026-1-01--2026-01-31",
        "2026-02-30--2026-03-01",
        "2026-02-01--2026-01-31",
    ],
)
def test_parse_date_range_invalid(date_arg):
    with pytest.raises(ValueError):
        parse_date_range(date_arg)


@mock.patch.dict(os.environ, VALID_ENV, clear=True)
@mock.patch("redmine_reporter.cli.fetch_issues_with_spent_time")
def test_cli_smoke_empty(mock_fetch):
    """Пустой список задач -- выход 0, сообщение о 0 задачах."""
    mock_fetch.return_value = []
    captured = StringIO()
    old_stdout, sys.stdout = sys.stdout, captured
    try:
        code = main(["--date", "2026-01-01--2026-01-31"])
    finally:
        sys.stdout = old_stdout
    assert code == 0
    assert "Total issues: 0" in captured.getvalue()


@mock.patch.dict(os.environ, VALID_ENV, clear=True)
@mock.patch("redmine_reporter.cli.fetch_issues_with_spent_time")
def test_cli_returns_zero_on_no_entries(mock_fetch):
    """None от fetch (нет time entries) -- выход 0."""
    mock_fetch.return_value = None
    code = main(["--date", "2026-01-01--2026-01-31"])
    assert code == 0


@mock.patch.dict(os.environ, {}, clear=True)
def test_cli_config_error():
    """Невалидный конфиг -- выход 1."""
    code = main(["--date", "2026-01-01--2026-01-31"])
    assert code == 1


@mock.patch.dict(os.environ, VALID_ENV, clear=True)
def test_cli_invalid_date_format():
    """Неверный формат даты -- выход 1."""
    code = main(["--date", "20260101-20260131"])
    assert code == 1


@mock.patch.dict(os.environ, VALID_ENV, clear=True)
@mock.patch("redmine_reporter.cli.fetch_issues_with_spent_time")
def test_cli_unknown_output_extension(mock_fetch, tmp_path):
    """Неизвестное расширение файла -- выход 1."""
    mock_fetch.return_value = []
    output = str(tmp_path / "report.xyz")
    code = main(["--date", "2026-01-01--2026-01-31", "--output", output])
    assert code == 1


@mock.patch.dict(os.environ, VALID_ENV, clear=True)
@mock.patch("redmine_reporter.cli.fetch_issues_with_spent_time")
def test_cli_output_without_extension(mock_fetch, tmp_path):
    """Файл без расширения -- выход 1 с подсказкой."""
    mock_fetch.return_value = []
    output = str(tmp_path / "report")
    code = main(["--date", "2026-01-01--2026-01-31", "--output", output])
    assert code == 1