"""ORCH-069: unit tests for the configurable QG-0 title-length limit.

Covers `_qg0_errors` (src/webhooks/plane.py) reading the upper title limit
dynamically from `settings.qg0_title_max` (env `ORCH_QG0_TITLE_MAX`, default 200),
plus the graceful env-degradation field-validator on `Settings`.

The tests patch `src.config.settings.qg0_title_max` (the same object imported into
`src.webhooks.plane`) and assert boundary behaviour and error texts. For env-driven
cases a FRESH `Settings()` instance is created locally, since the module-level
singleton is built once on import.
"""

import re

import pytest

from src.config import Settings, settings
from src.webhooks.plane import _qg0_errors

VALID_DESCRIPTION = "x" * 30  # >= 20 chars, always passes the description check


def _title_length_error(errors):
    """Return the title length-limit error string, or None if absent.

    The short-title error ('нужно >= 5') and the description error are excluded;
    only the 'too long' title error is matched (it contains 'максимум').
    """
    for e in errors:
        if "Title" in e and "максимум" in e:
            return e
    return None


# --- AC-1: default limit 200, boundary at 201 ------------------------------

def test_tc01_default_limit_200_boundary_pass(monkeypatch):
    """TC-01: title of exactly 200 chars -> no title length error (PASS)."""
    monkeypatch.setattr(settings, "qg0_title_max", 200)
    errors = _qg0_errors("x" * 200, VALID_DESCRIPTION)
    assert _title_length_error(errors) is None


def test_tc02_default_limit_200_boundary_fail(monkeypatch):
    """TC-02: title of 201 chars -> length error mentioning '200'."""
    monkeypatch.setattr(settings, "qg0_title_max", 200)
    errors = _qg0_errors("x" * 201, VALID_DESCRIPTION)
    err = _title_length_error(errors)
    assert err is not None
    assert "200" in err


# --- AC-2: configurable limit 120, boundary at 121 -------------------------

def test_tc03_custom_limit_120_boundary_pass(monkeypatch):
    """TC-03: with limit 120, a 120-char title passes."""
    monkeypatch.setattr(settings, "qg0_title_max", 120)
    errors = _qg0_errors("x" * 120, VALID_DESCRIPTION)
    assert _title_length_error(errors) is None


def test_tc04_custom_limit_120_boundary_fail(monkeypatch):
    """TC-04: with limit 120, a 121-char title fails; text mentions 120 not 80."""
    monkeypatch.setattr(settings, "qg0_title_max", 120)
    errors = _qg0_errors("x" * 121, VALID_DESCRIPTION)
    err = _title_length_error(errors)
    assert err is not None
    assert "120" in err
    assert "80" not in err


# --- AC-3: graceful handling of invalid/empty env --------------------------

def test_tc05_graceful_non_numeric_env(monkeypatch):
    """TC-05: non-numeric env -> Settings() does not raise, limit == 200."""
    monkeypatch.setenv("ORCH_QG0_TITLE_MAX", "abc")
    s = Settings()
    assert s.qg0_title_max == 200


def test_tc06_graceful_empty_env(monkeypatch):
    """TC-06: empty-string env -> default 200, no exception."""
    monkeypatch.setenv("ORCH_QG0_TITLE_MAX", "")
    s = Settings()
    assert s.qg0_title_max == 200


def test_tc07_valid_numeric_env(monkeypatch):
    """TC-07: valid numeric env -> the given value is applied (positive path)."""
    monkeypatch.setenv("ORCH_QG0_TITLE_MAX", "150")
    s = Settings()
    assert s.qg0_title_max == 150


# --- AC-4: lower limits unchanged ------------------------------------------

def test_tc08_short_title_still_errors(monkeypatch):
    """TC-08: title < 5 chars still raises the short-title error."""
    monkeypatch.setattr(settings, "qg0_title_max", 200)
    errors = _qg0_errors("abc", VALID_DESCRIPTION)
    assert any("Title" in e and "нужно >= 5" in e for e in errors)


def test_tc09_short_description_still_errors(monkeypatch):
    """TC-09: description < 20 chars still raises the short-description error."""
    monkeypatch.setattr(settings, "qg0_title_max", 200)
    errors = _qg0_errors("Valid title", "short")
    assert any("Description" in e for e in errors)


# --- AC-7: backward compatibility ------------------------------------------

def test_tc10_backward_compat_titles_81_to_200(monkeypatch):
    """TC-10: a title previously rejected by the 80-char cap now passes at 200."""
    monkeypatch.setattr(settings, "qg0_title_max", 200)
    errors = _qg0_errors("x" * 100, VALID_DESCRIPTION)
    assert _title_length_error(errors) is None