"""Tests for the scheduled dependency-bump automation (weekly uv.lock
refresh, monthly pyproject upper-bound raise). The workflow YAMLs themselves
can only be exercised by a real scheduled/dispatched run (same reasoning as
tests/test_release_tooling.py for the release workflow), so this checks the
script logic they drive plus the one piece of cross-file coupling that would
silently misbehave if it drifted: each workflow's script must target the
same standing branch that deps-pr.sh (invoked by that script) manages.
"""

import importlib.util
import re
import sys
import tomllib
from pathlib import Path

import pytest
import yaml
from packaging.requirements import Requirement
from packaging.version import Version

_ROOT = Path(__file__).resolve().parents[1]
_SCRIPTS = _ROOT / ".gitea" / "scripts"
_WORKFLOWS = _ROOT / ".gitea" / "workflows"


def _load_check_dep_bounds():
    spec = importlib.util.spec_from_file_location("check_dep_bounds", _SCRIPTS / "check_dep_bounds.py")
    assert spec is not None and spec.loader is not None
    module = importlib.util.module_from_spec(spec)
    sys.modules[spec.name] = module
    spec.loader.exec_module(module)
    return module


@pytest.fixture(scope="module")
def cdb():
    return _load_check_dep_bounds()


def test_canonical_requirements_finds_real_dependencies_and_skips_excluded(cdb):
    pyproject = tomllib.loads((_ROOT / "pyproject.toml").read_text())
    requirements = cdb.canonical_requirements(pyproject)

    assert "numpy" in requirements
    assert "polars" in requirements
    # polars appears in [project.dependencies], [convert], and [analysis]
    # with the same specifier — canonicalization must dedupe by name.
    assert isinstance(requirements["polars"], Requirement)

    for skipped in ("torch", "plotstyle", "giant"):
        assert skipped in cdb.SKIP_REASONS, f"{skipped} must stay on the never-auto-raise skip list"


def test_next_ceiling_pre_and_post_1_0():
    from importlib import import_module

    cdb = import_module("check_dep_bounds")
    # Post-1.0: next ceiling is the major above latest.
    assert cdb.next_ceiling(Version("2.5.3")) == "<3"
    assert cdb.next_ceiling(Version("25.0.1")) == "<26"
    # Pre-1.0: next ceiling is the minor above latest (matches this repo's
    # own pins, e.g. ruff>=0.15,<1 and ty>=0.0.50,<0.1).
    assert cdb.next_ceiling(Version("0.16.2")) == "<0.17"


def test_find_findings_flags_out_of_range_and_skips_excluded(cdb, monkeypatch):
    requirements = {
        "numpy": Requirement("numpy>=1.26,<3"),
        "widget": Requirement("widget>=1,<2"),
        "torch": Requirement("torch>=2.3,<2.4"),
    }
    fake_latest = {"numpy": "2.5.3", "widget": "3.1.0", "torch": "2.9.0"}
    monkeypatch.setattr(cdb, "fetch_latest_version", lambda name: fake_latest[name])

    findings = cdb.find_findings(requirements, {"torch": "pinned deliberately"})

    assert len(findings) == 1
    finding = findings[0]
    assert finding.name == "widget"
    assert set(finding.old_specifier.split(",")) == {">=1", "<2"}
    # SpecifierSet doesn't guarantee clause order, so compare as a set.
    assert set(finding.new_specifier.split(",")) == {">=1", "<4"}
    assert finding.latest == "3.1.0"


def test_apply_findings_rewrites_every_occurrence_and_nothing_else(cdb):
    text = (
        "[project]\n"
        "dependencies = [\n"
        '    "polars>=1.43,<2",\n'
        "]\n\n"
        "[project.optional-dependencies]\n"
        "convert = [\n"
        '    "polars>=1.43,<2",\n'
        "]\n"
        "other = [\n"
        '    "numpy>=1.26,<3",\n'
        "]\n"
    )
    finding = cdb.Finding(name="polars", old_specifier=">=1.43,<2", new_specifier=">=1.43,<3", latest="2.0.0")

    new_text = cdb.apply_findings(text, [finding])

    assert new_text.count('"polars>=1.43,<3"') == 2
    assert '"polars>=1.43,<2"' not in new_text
    # Untouched dependency (numpy) survives byte-for-byte.
    assert '"numpy>=1.26,<3"' in new_text


def test_apply_findings_on_real_pyproject_is_a_noop_when_no_findings(cdb):
    text = (_ROOT / "pyproject.toml").read_text()
    assert cdb.apply_findings(text, []) == text


@pytest.mark.parametrize(
    ("workflow_file", "script_file"),
    [
        ("deps-lock.yml", "deps-lock-pr.sh"),
        ("deps-bounds.yml", "deps-bounds-pr.sh"),
    ],
)
def test_workflow_yaml_parses_and_calls_matching_script(workflow_file, script_file):
    workflow = yaml.safe_load((_WORKFLOWS / workflow_file).read_text())
    assert "schedule" in workflow["on"]
    assert "workflow_dispatch" in workflow["on"]

    workflow_text = (_WORKFLOWS / workflow_file).read_text()
    assert script_file in workflow_text, f"{workflow_file} must invoke .gitea/scripts/{script_file}"


@pytest.mark.parametrize(
    ("script_file", "branch"),
    [
        ("deps-lock-pr.sh", "chore/uv-lock-upgrade"),
        ("deps-bounds-pr.sh", "chore/dep-bounds"),
    ],
)
def test_driver_script_branch_matches_deps_pr_invocations(script_file, branch):
    """Each driver script must define BRANCH as the expected literal, then
    route every git/deps-pr.sh call through that one $BRANCH variable — a
    hardcoded mismatch would silently leave a stray branch/PR or open a
    second one each run."""
    text = (_SCRIPTS / script_file).read_text()
    assert f'BRANCH="{branch}"' in text, f"{script_file} should set BRANCH={branch!r}"
    assert 'git checkout -B "$BRANCH"' in text
    assert re.search(r'deps-pr\.sh open "\$BRANCH"', text)
    assert re.search(r'deps-pr\.sh close "\$BRANCH"', text)