from unittest.mock import AsyncMock, MagicMock, patch

import pytest
from tests.helpers import fake_note


@pytest.fixture(autouse=True)
def _no_exclusions():
    """build_session_context asks for the bound project's always-on
    exclusions (milestone 297); these tests script the rules only."""
    with patch("scribe.services.plugin_context.rulebooks_svc.excluded_always_on_rulebooks",
               AsyncMock(return_value=[])):
        yield


pytestmark = pytest.mark.usefixtures("_no_supersession")


def _rule(rid, title, topic_id):
    r = MagicMock()
    r.id, r.title, r.topic_id = rid, title, topic_id
    r.statement = "FULL STATEMENT SHOULD NOT BE INJECTED"
    return r


# ─── knowledge auto-inject (Path A) ──────────────────────────────────────────


@pytest.mark.asyncio
async def test_get_autoinject_config_defaults_and_clamps():
    from scribe.services import plugin_context as pc

    # No settings stored → defaults.
    with patch.object(pc, "get_setting", AsyncMock(side_effect=lambda uid, k, d: d)):
        cfg = await pc.get_autoinject_config(1)
    assert cfg == {
        "enabled": pc.AUTOINJECT_DEFAULT_ENABLED,
        "threshold": pc.AUTOINJECT_DEFAULT_THRESHOLD,
        "top_k": pc.AUTOINJECT_DEFAULT_TOP_K,
    }

    # Out-of-range values are clamped; top_k capped at the hard ceiling.
    stored = {
        pc.AUTOINJECT_ENABLED_KEY: "false",
        pc.AUTOINJECT_THRESHOLD_KEY: "5",
        pc.AUTOINJECT_TOP_K_KEY: "999",
    }
    with patch.object(pc, "get_setting",
                      AsyncMock(side_effect=lambda uid, k, d: stored.get(k, d))):
        cfg = await pc.get_autoinject_config(1)
    assert cfg["enabled"] is False
    assert cfg["threshold"] == 1.0
    assert cfg["top_k"] == pc._AUTOINJECT_MAX_TOP_K


@pytest.mark.asyncio
async def test_build_autoinject_hint_disabled_returns_empty_and_skips_search():
    from scribe.services import plugin_context as pc
    search = AsyncMock()
    with patch.object(pc, "get_autoinject_config",
                      AsyncMock(return_value={"enabled": False, "threshold": 0.55, "top_k": 3})), \
         patch.object(pc, "semantic_search_notes", search), \
         patch.object(pc, "record_retrieval", MagicMock()):
        out = await pc.build_autoinject_hint(1, "anything")
    assert out["context"] == "" and out["note_ids"] == []
    search.assert_not_called()  # disabled → no retrieval at all


@pytest.mark.asyncio
async def test_build_autoinject_hint_titles_only_with_margin_gate():
    from scribe.services import plugin_context as pc
    # top=0.80; 0.74 within band (0.10), 0.61 outside → dropped.
    hits = [(0.80, fake_note(id=11, title="Pool sizing decision", user_id=1)),
            (0.74, fake_note(id=22, title="run_maintenance thresholds", user_id=1)),
            (0.61, fake_note(id=33, title="unrelated-ish", user_id=1))]
    rec = MagicMock()
    with patch.object(pc, "get_autoinject_config",
                      AsyncMock(return_value={"enabled": True, "threshold": 0.55, "top_k": 3})), \
         patch.object(pc, "semantic_search_notes", AsyncMock(return_value=hits)), \
         patch.object(pc, "record_retrieval", rec):
        out = await pc.build_autoinject_hint(1, "postgres pool", project_id=2,
                                             exclude_ids=[99])
    # Margin gate kept the top two, dropped the straggler.
    assert out["note_ids"] == [11, 22]
    assert '#11 [note] "Pool sizing decision" (0.80)' in out["context"]
    assert "#33" not in out["context"]
    # Title-first: no body text, ever.
    assert "get_note(id)" in out["context"]
    # Telemetry fired for BOTH retrievals this path runs: the scored menu and
    # the reuse-slot query competing against it. The slot's query used to be
    # the one unlogged retrieval on this path — the hit it displaced was in
    # retrieval_logs, the query that displaced it was not (#2463).
    sources = [c.kwargs["source"] for c in rec.call_args_list]
    assert sources == ["auto_inject", "reuse_slot"]


@pytest.mark.asyncio
async def test_build_autoinject_hint_blank_query_returns_empty():
    from scribe.services import plugin_context as pc
    search = AsyncMock()
    with patch.object(pc, "get_autoinject_config",
                      AsyncMock(return_value={"enabled": True, "threshold": 0.55, "top_k": 3})), \
         patch.object(pc, "semantic_search_notes", search):
        out = await pc.build_autoinject_hint(1, "   ")
    assert out["context"] == ""
    search.assert_not_called()


@pytest.mark.asyncio
async def test_build_session_context_renders_titles_grouped_by_topic():
    rules = [
        _rule(1, "`dev` is home", 1),
        _rule(2, "Release — never without explicit request", 1),
        _rule(3, "No GitHub — Fabled-Git only", 2),
    ]
    with patch("scribe.services.plugin_context.rulebooks_svc.list_always_on_rules",
               AsyncMock(return_value=rules)), \
         patch("scribe.services.plugin_context._topic_titles",
               AsyncMock(return_value={1: "git-workflow", 2: "fabled-git"})):
        from scribe.services.plugin_context import build_session_context
        out = await build_session_context(user_id=7, project_id=0)

    ctx = out["context"]
    assert out["rule_count"] == 3
    assert out["project"] is None
    # Titles present, grouped under topic headings
    assert "### git-workflow" in ctx
    assert "### fabled-git" in ctx
    assert "- [1] `dev` is home" in ctx
    assert "- [3] No GitHub — Fabled-Git only" in ctx
    # Full statements must NOT be dumped (push channel injects titles only)
    assert "FULL STATEMENT SHOULD NOT BE INJECTED" not in ctx


@pytest.mark.asyncio
async def test_build_session_context_includes_project_when_scoped():
    # design_system_id explicitly None: a bare MagicMock would hand back a truthy
    # auto-attribute and send this through the design branch, which is the
    # opposite of what this test is about.
    project = MagicMock(id=2, title="FabledScribe", goal="ship it",
                        design_system_id=None)
    with patch("scribe.services.plugin_context.rulebooks_svc.list_always_on_rules",
               AsyncMock(return_value=[_rule(1, "rule", 1)])), \
         patch("scribe.services.plugin_context._topic_titles",
               AsyncMock(return_value={1: "git-workflow"})), \
         patch("scribe.services.plugin_context.projects_svc.get_project",
               AsyncMock(return_value=project)), \
         patch("scribe.services.plugin_context.notes_svc.list_notes",
               AsyncMock(return_value=([], 4))):
        from scribe.services.plugin_context import build_session_context
        out = await build_session_context(user_id=7, project_id=2)

    assert out["project"] == {"id": 2, "title": "FabledScribe"}
    assert "## Active project: FabledScribe (id 2)" in out["context"]
    assert "Open todo tasks: 4" in out["context"]
    # No design system on the project -> no design block at all. An install with
    # none is the ordinary case, not a degraded one.
    assert "## Design system" not in out["context"]


@pytest.mark.asyncio
async def test_build_session_context_pushes_the_projects_design_system():
    """The gap this closes: a design system had no push channel, so its
    standards reached a session only if the agent already knew to go looking —
    the same silent failure as a token nobody declares."""
    project = MagicMock(id=2, title="App", goal="", design_system_id=9)
    design = {
        "id": 9, "title": "App kit", "description": "",
        "inherits_from": ["House"],
        "guidance": [], "token_count": 95,
        "token_groups": ["accent", "surface", "type"],
    }
    with patch("scribe.services.plugin_context.rulebooks_svc.list_always_on_rules",
               AsyncMock(return_value=[_rule(1, "rule", 1)])), \
         patch("scribe.services.plugin_context._topic_titles",
               AsyncMock(return_value={1: "git-workflow"})), \
         patch("scribe.services.plugin_context.projects_svc.get_project",
               AsyncMock(return_value=project)), \
         patch("scribe.services.plugin_context.notes_svc.list_notes",
               AsyncMock(return_value=([], 0))), \
         patch("scribe.services.plugin_context.design_systems_svc.design_context",
               AsyncMock(return_value=design)):
        from scribe.services.plugin_context import build_session_context
        out = await build_session_context(user_id=7, project_id=2)

    ctx = out["context"]
    assert "## Design system: App kit (id 9) (inherits House)" in ctx
    assert "95 tokens across accent, surface, type" in ctx
    # A pointer to the values, never the values themselves — a hundred token
    # declarations would crowd out the context they are meant to inform. The
    # summary carries counts and group NAMES only, which is why design_context
    # returns those rather than the resolved tokens.
    assert "resolve_design_system(9)" in ctx
    assert "get_design_system_stylesheet(9)" in ctx


@pytest.mark.asyncio
async def test_build_session_context_survives_an_unreadable_design_system():
    """design_context returns None when the caller may not read the system.
    That must degrade to "no design block", not to a crash that costs the
    session its rules too."""
    project = MagicMock(id=2, title="App", goal="", design_system_id=9)
    with patch("scribe.services.plugin_context.rulebooks_svc.list_always_on_rules",
               AsyncMock(return_value=[_rule(1, "rule", 1)])), \
         patch("scribe.services.plugin_context._topic_titles",
               AsyncMock(return_value={1: "git-workflow"})), \
         patch("scribe.services.plugin_context.projects_svc.get_project",
               AsyncMock(return_value=project)), \
         patch("scribe.services.plugin_context.notes_svc.list_notes",
               AsyncMock(return_value=([], 0))), \
         patch("scribe.services.plugin_context.design_systems_svc.design_context",
               AsyncMock(return_value=None)):
        from scribe.services.plugin_context import build_session_context
        out = await build_session_context(user_id=7, project_id=2)

    assert "## Design system" not in out["context"]
    assert "## Active project: App (id 2)" in out["context"]


@pytest.mark.asyncio
async def test_build_session_context_unbound_repo_emits_bind_hint():
    with patch("scribe.services.plugin_context.rulebooks_svc.list_always_on_rules",
               AsyncMock(return_value=[_rule(1, "rule", 1)])), \
         patch("scribe.services.plugin_context._topic_titles",
               AsyncMock(return_value={1: "git-workflow"})):
        from scribe.services.plugin_context import build_session_context
        out = await build_session_context(
            user_id=7, project_id=0, unbound_repo="host/owner/repo",
        )

    ctx = out["context"]
    assert out["project"] is None
    assert "## Repository not yet bound" in ctx
    assert 'bind_repo(repo_url="host/owner/repo"' in ctx
    # No project block when unbound.
    assert "## Active project" not in ctx


@pytest.mark.asyncio
async def test_build_process_manifest_renders_stub_specs():
    items = [
        {"id": 5, "title": "Drift Audit", "tags": [], "snippet": "Find drifted docs."},
        {"id": 9, "title": "DRY Pass", "tags": [], "snippet": ""},
    ]
    with patch("scribe.services.plugin_context.knowledge_svc.query_knowledge",
               AsyncMock(return_value=(items, 2))):
        from scribe.services.plugin_context import build_process_manifest
        out = await build_process_manifest(user_id=7)

    assert out["total"] == 2
    drift = out["processes"][0]
    assert drift["id"] == 5
    assert drift["name"] == "Drift Audit"
    assert drift["slug"] == "drift-audit"          # kebab-cased
    assert "Drift Audit" in drift["description"]   # auto-surface trigger
    assert "Find drifted docs." in drift["description"]  # preview folded in
    # No-snippet process still gets a usable description.
    assert "DRY Pass" in out["processes"][1]["description"]


@pytest.mark.asyncio
async def test_build_process_manifest_dedupes_slugs_and_skips_blank_titles():
    items = [
        {"id": 1, "title": "My Process", "tags": [], "snippet": "a"},
        {"id": 2, "title": "my process", "tags": [], "snippet": "b"},  # same slug
        {"id": 3, "title": "   ", "tags": [], "snippet": "skip me"},   # blank title
    ]
    with patch("scribe.services.plugin_context.knowledge_svc.query_knowledge",
               AsyncMock(return_value=(items, 3))):
        from scribe.services.plugin_context import build_process_manifest
        out = await build_process_manifest(user_id=7)

    slugs = [p["slug"] for p in out["processes"]]
    assert slugs == ["my-process", "my-process-2"]  # collision suffixed with id
    assert out["total"] == 2                          # blank-title entry dropped


@pytest.mark.asyncio
async def test_build_process_manifest_truncates_long_preview():
    items = [{"id": 1, "title": "Big", "tags": [], "snippet": "x" * 500}]
    with patch("scribe.services.plugin_context.knowledge_svc.query_knowledge",
               AsyncMock(return_value=(items, 1))):
        from scribe.services.plugin_context import build_process_manifest
        out = await build_process_manifest(user_id=7)

    assert "…" in out["processes"][0]["description"]
    assert "x" * 500 not in out["processes"][0]["description"]


@pytest.mark.asyncio
async def test_build_session_context_caps_length():
    many = [_rule(i, "x" * 200, 1) for i in range(200)]
    with patch("scribe.services.plugin_context.rulebooks_svc.list_always_on_rules",
               AsyncMock(return_value=many)), \
         patch("scribe.services.plugin_context._topic_titles",
               AsyncMock(return_value={1: "git-workflow"})):
        from scribe.services.plugin_context import build_session_context
        out = await build_session_context(user_id=7)

    assert len(out["context"]) <= 9000 + 60  # cap + truncation note
    assert "truncated" in out["context"]


# --- the reuse slot (#2246) --------------------------------------------------

_CFG = {"enabled": True, "threshold": 0.55, "top_k": 3}


async def _autoinject(main_hits, reuse_hits, cfg=None):
    """Run build_autoinject_hint with the two semantic queries stubbed in order:
    the unscoped pool first, then the reserved reuse query."""
    calls: list[dict] = []

    async def fake_search(*_a, **kw):
        calls.append(kw)
        return reuse_hits if kw.get("note_type") else main_hits

    with patch("scribe.services.plugin_context.get_autoinject_config",
               AsyncMock(return_value=dict(cfg or _CFG))), \
         patch("scribe.services.plugin_context.semantic_search_notes",
               AsyncMock(side_effect=fake_search)), \
         patch("scribe.services.plugin_context.record_retrieval", MagicMock()), \
         patch("scribe.services.plugin_context.record_surfaced", MagicMock()), \
         patch("scribe.services.plugin_context.owner_names_for",
               AsyncMock(return_value={})):
        from scribe.services.plugin_context import build_autoinject_hint
        out = await build_autoinject_hint(1, "write a debounce helper")
    return out, calls


@pytest.mark.asyncio
async def test_a_snippet_takes_the_last_slot_when_none_won_on_score():
    """The measured failure: a prompt asking for a helper returned three project
    records ABOUT building the retrieval system, and zero snippets. Scribe's own
    records are about software work, so they share vocabulary with any coding
    prompt while answering none of them."""
    main = [(0.66, fake_note(id=1, title="Step 3: title-first auto-inject", user_id=1)),
            (0.65, fake_note(id=2, title="Task-reminder dedup query crashes", user_id=1, is_task=True)),
            (0.64, fake_note(id=3, title="Drafter hardening · write-path trigger", user_id=1, is_task=True))]
    reuse = [(0.58, fake_note(id=9, title="debounce — collapse rapid calls", user_id=1, note_type="snippet"))]

    out, calls = await _autoinject(main, reuse)

    assert out["note_ids"] == [1, 2, 9]        # last slot displaced, not the first
    assert "#9" in out["context"] and "[snippet]" in out["context"]
    # The reserved query is scoped to the reuse kinds and asks for exactly one.
    assert calls[1]["note_type"] == ("snippet", "process")
    assert calls[1]["limit"] == 1


@pytest.mark.asyncio
async def test_the_reserved_query_is_skipped_when_a_snippet_already_won():
    """No second query, and no slot spent twice, when ranking already did the
    right thing — the fix must be invisible in the case it isn't needed."""
    main = [(0.81, fake_note(id=9, title="debounce helper", user_id=1, note_type="snippet")),
            (0.80, fake_note(id=1, title="some task", user_id=1, is_task=True))]

    out, calls = await _autoinject(main, [])

    assert len(calls) == 1                      # reserved query never ran
    assert out["note_ids"] == [9, 1]


@pytest.mark.asyncio
async def test_a_weak_snippet_does_not_buy_the_slot():
    """The reserved hit skips the MARGIN band — that band is what snippets lose
    to — but never the threshold. Silence stays the default; a slot spent on an
    irrelevant snippet is how a menu teaches people to ignore it."""
    main = [(0.66, fake_note(id=1, title="a task", user_id=1, is_task=True))]

    out, calls = await _autoinject(main, [])     # threshold returned nothing

    assert out["note_ids"] == [1]
    assert len(calls) == 2                       # it asked, and got nothing


@pytest.mark.asyncio
async def test_the_reserved_hit_is_not_held_to_the_margin_band():
    """0.58 is 0.08 below the top hit. Under the band it would survive; the point
    is that it must survive even when it wouldn't — a snippet losing to a
    same-vocabulary project record by a wide margin is the whole bug."""
    main = [(0.90, fake_note(id=1, title="a task", user_id=1, is_task=True))]
    reuse = [(0.58, fake_note(id=9, title="debounce", user_id=1, note_type="snippet"))]

    out, _calls = await _autoinject(main, reuse)

    assert 9 in out["note_ids"]


@pytest.mark.asyncio
async def test_a_process_counts_as_reuse_too():
    """A stored process answers 'how do we do X here' the same way a snippet
    answers 'what do we already have' — both lose to the same project records."""
    main = [(0.70, fake_note(id=1, title="a task", user_id=1, is_task=True))]
    reuse = [(0.60, fake_note(id=8, title="DRY pass process", user_id=1, note_type="process"))]

    out, _ = await _autoinject(main, reuse)
    assert 8 in out["note_ids"]

    # …and one already on the menu suppresses the reserved query.
    out2, calls2 = await _autoinject(
        [(0.70, fake_note(id=8, title="DRY pass process", user_id=1, note_type="process"))], [])
    assert len(calls2) == 1


# --- write-path widened beyond snippets (#2246, the mirror half) -------------

@pytest.mark.asyncio
async def test_write_path_semantic_arm_asks_for_experience_not_just_snippets():
    """The inverse of auto-inject's mistake. This arm was snippets-only, so an
    issue saying "we tried this and it deadlocked" could never reach the moment
    that code was about to be written — arguably the better prior art, because
    it says what NOT to do."""
    from scribe.services import plugin_context as pc

    hits = [(0.72, fake_note(id=9, title="debounce helper", user_id=1, note_type="snippet")),
            (0.70, fake_note(id=7, title="Debounce dropped the trailing call", user_id=1, is_task=True, task_kind="issue"))]
    search = AsyncMock(return_value=hits)
    rec = MagicMock()
    with patch.object(pc, "get_writepath_config",
                      AsyncMock(return_value={"enabled": True, "threshold": 0.6,
                                              "top_k": 3})), \
         patch.object(pc.snippets_svc, "list_snippets",
                      AsyncMock(return_value=([], 0))), \
         patch.object(pc, "semantic_search_notes", search), \
         patch.object(pc, "record_retrieval", rec), \
         patch.object(pc, "record_surfaced", MagicMock()), \
         patch.object(pc, "owner_names_for", AsyncMock(return_value={})), \
         patch.object(pc, "concept_query", MagicMock(return_value="debounce a callback")):
        out = await pc.build_write_path_hint(
            1, "src/utils/debounce.ts", code="x" * 400,
        )

    kw = search.await_args.kwargs
    assert kw["note_type"] == ("snippet", "note")
    # An open to-do resembling the code answers nothing; an ISSUE carries a root
    # cause and a NOTE carries durable knowledge. Only the todo is excluded.
    assert kw["task_kind"] == "issue"
    # Telemetry must not claim this was a notes-only retrieval any more.
    assert rec.call_args.kwargs["is_task"] is None


@pytest.mark.asyncio
async def test_write_path_labels_a_non_snippet_hit_with_its_kind():
    """An unlabelled issue on this menu reads as "here is code to reuse", which
    is the opposite of what it says. A snippet stays unlabelled — it is the
    menu's default and the header's default reading."""
    from scribe.services import plugin_context as pc

    hits = [(0.72, fake_note(id=9, title="debounce helper", user_id=1, note_type="snippet")),
            (0.71, fake_note(id=7, title="Debounce dropped the trailing call", user_id=1, is_task=True, task_kind="issue"))]
    with patch.object(pc, "get_writepath_config",
                      AsyncMock(return_value={"enabled": True, "threshold": 0.6,
                                              "top_k": 3})), \
         patch.object(pc.snippets_svc, "list_snippets",
                      AsyncMock(return_value=([], 0))), \
         patch.object(pc, "semantic_search_notes", AsyncMock(return_value=hits)), \
         patch.object(pc, "record_retrieval", MagicMock()), \
         patch.object(pc, "record_surfaced", MagicMock()), \
         patch.object(pc, "owner_names_for", AsyncMock(return_value={})), \
         patch.object(pc, "concept_query", MagicMock(return_value="debounce a callback")):
        out = await pc.build_write_path_hint(
            1, "src/utils/debounce.ts", code="x" * 400,
        )

    ctx = out["context"]
    assert "· issue]" in ctx                 # the issue says what it is
    assert '[similar 0.72] "debounce helper"' in ctx   # the snippet does not
    # The header now names the right opener for each kind.
    assert "get_task(id)" in ctx and "get_snippet(id)" in ctx
