"""An area's rulings reach the work that touches its files (milestone 444, #4757).

These pin:

- WHAT A RULING IS, as read: a bullet under the last `Rulings` heading of a
  System's description, wrapped lines joined, the section ending at the first
  line that is neither.
- WHICH PATHS A COMMAND NAMES: reads and writes alike, relative to the repo
  root whatever the command's cwd; flags, URLs and globs are not paths, and a
  path outside the repo is nobody's area.
- THE ARM: a lookup, not a search. No rulings or no patterns says nothing; a
  path in two areas hears both; a repeat is one short reference line and is
  neither counted as a surfacing nor handed back as newly shown.
- THE WIRING: both PreToolUse builders carry it, ahead of what they rank.
"""
from __future__ import annotations

from types import SimpleNamespace
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from scribe.services import plugin_context as pc
from scribe.services import system_rulings as sr
# Bound at import, before conftest's autouse stub replaces the module attribute.
from scribe.services.system_rulings import rulings_for_paths as real_rulings_for_paths
from tests.helpers import writepath_cfg

DOWNLOADS = """Fetching and keeping downloads healthy: stalls, retries, the blocklist.

Rulings
- Failed work is retried until it succeeds; no attempt limit. (Operator, 2026-09-19, #1234)
- A blocklisted release falls off the list after a while
  and may be tried again. (Operator, 2026-09-20, #1240)
"""


def _system(sid, name, description, patterns):
    return SimpleNamespace(id=sid, name=name, description=description, path_patterns=patterns)


# ── reading the section ──────────────────────────────────────────────────


def test_rulings_are_the_bullets_under_the_heading_with_wrapped_lines_joined():
    assert sr.parse_rulings(DOWNLOADS) == [
        "Failed work is retried until it succeeds; no attempt limit. (Operator, 2026-09-19, #1234)",
        "A blocklisted release falls off the list after a while and may be tried again. "
        "(Operator, 2026-09-20, #1240)",
    ]


@pytest.mark.parametrize("heading", ["Rulings", "## Rulings", "**Rulings**", "Rulings:", "### rulings"])
def test_the_heading_may_be_written_several_ways(heading):
    assert sr.parse_rulings(f"Charter.\n\n{heading}\n- One. (Operator)\n") == ["One. (Operator)"]


def test_no_section_and_an_empty_description_have_no_rulings():
    assert sr.parse_rulings("A charter that mentions rulings in passing.") == []
    assert sr.parse_rulings("") == []
    assert sr.parse_rulings(None) == []


def test_the_section_ends_where_a_paragraph_starts():
    text = "Rulings\n- Kept. (Operator)\n\nNotes written after the section.\n- Not a ruling.\n"
    assert sr.parse_rulings(text) == ["Kept. (Operator)"]


# ── the paths a command names ────────────────────────────────────────────


ROOT = "/home/me/repo"


@pytest.mark.parametrize("command,cwd,expected", [
    ("sed -n 1,80p src/app/downloads.py", ROOT, ["src/app/downloads.py"]),
    # Absolute inside the root, and outside it.
    (f"cat {ROOT}/src/app/x.py /etc/hosts", ROOT, ["src/app/x.py"]),
    # A command run from a subdirectory names paths relative to it.
    ("grep -n retry downloads.py", f"{ROOT}/src/app", ["src/app/downloads.py"]),
    ("cat ../../../elsewhere/x.py", f"{ROOT}/src", []),
    # Flags, URLs and globs are not paths; a `--flag=path` and a `path:line` are.
    ("pytest -q --rootdir=tests/unit tests/test_x.py::test_y", ROOT,
     ["tests/unit", "tests/test_x.py"]),
    ("curl https://example.com/a/b.json", ROOT, []),
    ("ls src/*.py", ROOT, []),
    ("vim src/app/x.py:120", ROOT, ["src/app/x.py"]),
    # Repeats collapse; a bare word with no slash or extension is not a path.
    ("git add src/a.py src/a.py && git commit -m done", ROOT, ["src/a.py"]),
])
def test_command_paths(command, cwd, expected):
    assert sr.command_paths(command, root=ROOT, cwd=cwd) == expected


def test_without_a_root_relative_paths_are_taken_as_given_and_absolute_ones_dropped():
    assert sr.command_paths("cat src/a.py /abs/b.py") == ["src/a.py"]


def test_an_unbalanced_quote_still_yields_paths():
    assert sr.command_paths("echo 'oops src/a.py") == ["src/a.py"]


# ── the arm ──────────────────────────────────────────────────────────────


async def _arm(systems, paths, seen=None):
    lister = AsyncMock(return_value=systems)
    recorder = MagicMock()
    with patch.object(sr.systems_svc, "list_systems", lister), \
         patch.object(sr, "record_system_surfaced", recorder):
        out = await real_rulings_for_paths(1, 2, paths, seen=seen, source="rulings_test")
    return out, recorder


@pytest.mark.asyncio
async def test_a_touched_area_with_rulings_shows_them_once_in_full_and_records_it():
    downloads = _system(104, "Download lifecycle", DOWNLOADS, ["src/app/downloads"])
    out, recorder = await _arm([downloads], ["src/app/downloads/retry.py"])
    [line] = out["lines"]
    assert line.startswith("> Rulings for `src/app/downloads/retry.py`")
    assert "Download lifecycle (System 104)" in line
    assert "(1) Failed work is retried until it succeeds" in line
    assert "(2) A blocklisted release falls off" in line
    assert out["system_ids"] == [104]
    recorder.assert_called_once()
    assert recorder.call_args.kwargs["system_ids"] == [104]
    assert recorder.call_args.kwargs["source"] == "rulings_test"


@pytest.mark.asyncio
async def test_an_area_without_rulings_says_nothing():
    plain = _system(5, "Billing", "What billing is for, and nothing decided.", ["src/billing"])
    out, recorder = await _arm([plain], ["src/billing/invoice.py"])
    assert out == {"lines": [], "system_ids": []}
    recorder.assert_not_called()


@pytest.mark.asyncio
async def test_an_area_without_patterns_claims_no_files():
    unnamed = _system(104, "Download lifecycle", DOWNLOADS, [])
    out, _ = await _arm([unnamed], ["src/app/downloads/retry.py"])
    assert out["lines"] == []


@pytest.mark.asyncio
async def test_a_path_in_two_areas_hears_both():
    downloads = _system(104, "Download lifecycle", DOWNLOADS, ["src/app/downloads"])
    storage = _system(7, "Storage", "Where files go.\n\nRulings\n- Never delete a user file. (Operator)\n",
                      ["src/app/**/*.py"])
    out, _ = await _arm([downloads, storage], ["src/app/downloads/retry.py"])
    assert len(out["lines"]) == 2
    assert out["system_ids"] == [104, 7]


@pytest.mark.asyncio
async def test_a_repeat_is_a_reference_and_is_not_counted_again():
    downloads = _system(104, "Download lifecycle", DOWNLOADS, ["src/app/downloads"])
    out, recorder = await _arm([downloads], ["src/app/downloads/retry.py"], seen=[104])
    [line] = out["lines"]
    assert "shown earlier this session" in line
    assert "Failed work is retried" not in line
    assert out["system_ids"] == []
    recorder.assert_not_called()


@pytest.mark.asyncio
async def test_no_project_or_no_paths_reads_nothing():
    lister = AsyncMock(return_value=[])
    with patch.object(sr.systems_svc, "list_systems", lister):
        assert await real_rulings_for_paths(1, 0, ["src/a.py"], source="t") == {"lines": [], "system_ids": []}
        assert await real_rulings_for_paths(1, 2, [], source="t") == {"lines": [], "system_ids": []}
    lister.assert_not_called()


@pytest.mark.asyncio
async def test_a_failing_lookup_fails_open():
    with patch.object(sr.systems_svc, "list_systems", AsyncMock(side_effect=RuntimeError("db"))):
        out = await real_rulings_for_paths(1, 2, ["src/a.py"], source="t")
    assert out == {"lines": [], "system_ids": []}


@pytest.mark.asyncio
async def test_a_long_list_is_bounded_per_area():
    many = "Rulings\n" + "".join(f"- Ruling {i}. (Operator)\n" for i in range(12))
    area = _system(9, "Busy", many, ["src"])
    out, _ = await _arm([area], ["src/x.py"])
    assert "(8) Ruling 7." in out["lines"][0]
    assert "Ruling 8." not in out["lines"][0]
    assert "+4 more in `get_system(9)`" in out["lines"][0]


# ── the wiring ───────────────────────────────────────────────────────────


RULING_LINE = "> Rulings for `src/a.py` — the operator's decisions about A (System 3): (1) x"


@pytest.mark.asyncio
async def test_the_tool_arm_leads_with_rulings_and_hands_back_what_it_showed():
    rulings = AsyncMock(return_value={"lines": [RULING_LINE], "system_ids": [3]})
    with patch.object(pc, "_tool_rule_hint", AsyncMock(return_value={
            "context": "> a rule line", "rule_ids": [8], "checkpoint": {}})), \
         patch.object(pc, "get_writepath_config", AsyncMock(return_value=writepath_cfg())), \
         patch.object(pc.system_rulings_svc, "rulings_for_paths", rulings):
        out = await pc.build_tool_rule_hint(
            1, "Bash", f"cat {ROOT}/src/a.py", project_id=2,
            root=ROOT, cwd=ROOT, seen_ruling_systems=[5],
        )
    assert out["context"].splitlines() == [RULING_LINE, "> a rule line"]
    assert out["ruling_system_ids"] == [3]
    args, kwargs = rulings.call_args
    assert args[2] == ["src/a.py"]
    assert kwargs["seen"] == [5] and kwargs["source"] == "rulings_pre_tool"


@pytest.mark.asyncio
async def test_the_tool_arm_adds_no_key_when_no_ruling_was_shown():
    with patch.object(pc, "_tool_rule_hint", AsyncMock(return_value={
            "context": "", "rule_ids": [], "checkpoint": {}})), \
         patch.object(pc, "get_writepath_config", AsyncMock(return_value=writepath_cfg())):
        out = await pc.build_tool_rule_hint(1, "Bash", "ls", project_id=2)
    assert "ruling_system_ids" not in out


@pytest.mark.asyncio
async def test_a_write_with_no_prior_art_still_carries_its_areas_rulings():
    rulings = AsyncMock(return_value={"lines": [RULING_LINE], "system_ids": [3]})
    with patch.object(pc, "get_writepath_config", AsyncMock(return_value=writepath_cfg())), \
         patch.object(pc.snippets_svc, "list_snippets", AsyncMock(return_value=([], 0))), \
         patch.object(pc, "semantic_search_notes", AsyncMock(return_value=[])), \
         patch.object(pc, "record_retrieval", MagicMock()), \
         patch.object(pc.projects_svc, "get_project", AsyncMock(return_value=None)), \
         patch.object(pc.system_rulings_svc, "rulings_for_paths", rulings):
        out = await pc.build_write_path_hint(
            1, "src/a.py", code="x = 1", project_id=2, seen_ruling_systems=[9],
        )
    assert out["context"] == RULING_LINE
    assert out["ruling_system_ids"] == [3]
    args, kwargs = rulings.call_args
    assert args[2] == ["src/a.py"]
    assert kwargs["seen"] == [9] and kwargs["source"] == "rulings_write_path"