"""Markdown code-span mentions become heading --references--> symbol edges.

``extract_markdown``'s docstring promised ``heading --references--> other node``
for a backtick `Name`, but nothing implemented it: a docs corpus and its code
corpus shared no edge at all. Mentions now ride the ``raw_calls`` channel
(tagged ``language: "markdown"``) and the ``markdown_mentions`` language
resolver matches them against the merged corpus after the id-remap passes.
"""
from __future__ import annotations

import json
import os
from pathlib import Path

from graphify.extract import extract
from graphify.extractors.markdown import _code_span_mention, extract_markdown
from graphify.markdown_resolution import _match_cited_file

_WIDGET_PY = '''\
class Widget:
    def render(self):
        return "w"


def helper():
    return Widget()
'''

_GADGET_PY = '''\
class Gadget:
    def render(self):
        return "g"


def helper():
    return Gadget()
'''

_GUIDE_MD = '''\
# Guide

Start with `Widget`; `str` and `print()` are built-ins.

## Rendering

`Widget` draws through `Widget.render()`; `helper()` is defined twice.

```python
print(Widget)
```

## Pinned

See `src/widget.py::Widget::render` and `src/gadget.py::helper`.
Also `../src/widget.py::Widget` and the missing `src/nowhere.py::Widget`.
'''


def _extract(tmp_path, files: dict[str, str]):
    for name, body in files.items():
        p = tmp_path / name
        p.parent.mkdir(parents=True, exist_ok=True)
        p.write_text(body)
    old = os.getcwd()
    try:
        os.chdir(tmp_path)
        return extract([Path(n) for n in files],
                       cache_root=tmp_path / ".cache", parallel=False)
    finally:
        os.chdir(old)


def _node(r, label, source_contains=""):
    return next(n for n in r["nodes"]
                if n["label"] == label and source_contains in str(n.get("source_file", "")))


def _references(r):
    return {(e["source"], e["target"]): e for e in r["edges"]
            if e["relation"] == "references"}


def test_code_span_mentions_are_classified():
    assert _code_span_mention("Widget") == (None, ["Widget"])
    assert _code_span_mention("render()") == (None, ["render"])
    assert _code_span_mention("pkg.sub.Widget") == (None, ["pkg", "sub", "Widget"])
    assert _code_span_mention("Widget.render()") == (None, ["Widget", "render"])
    # A file-like span with an unknown extension classifies as a mention and
    # is rejected at resolution, where `pyproject` matches no callable.
    assert _code_span_mention("pyproject.toml") == (None, ["pyproject", "toml"])
    pinned = ("src/widget.py", ["Widget", "render"])
    assert _code_span_mention("src/widget.py::Widget::render") == pinned
    assert _code_span_mention("src/widget.py::Widget::render()") == pinned
    # Files, commands, expressions and prose are not symbol mentions.
    for span in ("setup.py", "README.md", "notes.txt", "git revert", "x = 1", "a-b",
                 "--flag", "", "src/widget.py"):
        assert _code_span_mention(span) is None, span


def test_cited_file_matching():
    sources = {"src/mod.py", ".github/scripts/check.py", "lib/x.py", "vendor/lib/x.py",
               "docs/src/mod.py"}
    # Doc-relative first, then exact, then a unique segment-aligned suffix.
    assert _match_cited_file("src/mod.py", "docs/guide.md", sources) == "docs/src/mod.py"
    assert _match_cited_file("src/mod.py", "README.md", sources) == "src/mod.py"
    assert _match_cited_file("mod.py", "README.md", sources) is None
    assert _match_cited_file("scripts/check.py", "README.md", sources) == (
        ".github/scripts/check.py")
    # `./` and `../` are stripped as segments: a hidden directory keeps its dot.
    assert _match_cited_file(".github/scripts/check.py", "docs/guide.md", sources) == (
        ".github/scripts/check.py")
    assert _match_cited_file("./src/mod.py", "README.md", sources) == "src/mod.py"
    # The suffix form also names a root-level file.
    assert _match_cited_file("lib/x.py", "docs/guide.md", {"lib/x.py"}) == "lib/x.py"
    # An explicit relative cite resolves against the document only: escaping
    # the corpus never falls through to another copy of the file.
    assert _match_cited_file("../lib/x.py", "docs/guide.md", sources) == "lib/x.py"
    assert _match_cited_file("../lib/x.py", "README.md", sources) is None
    assert _match_cited_file("../../vendor/lib/x.py", "docs/guide.md", sources) is None


def test_extract_markdown_reports_mentions_as_markdown_raw_calls(tmp_path):
    doc = tmp_path / "docs" / "guide.md"
    doc.parent.mkdir()
    doc.write_text(_GUIDE_MD)

    r = extract_markdown(doc)

    assert r["edges"] == [e for e in r["edges"] if e["relation"] == "contains"]
    calls = r["raw_calls"]
    assert calls and all(rc["language"] == "markdown" for rc in calls)
    assert all(rc["is_member_call"] is False for rc in calls)
    heading_ids = {n["label"]: n["id"] for n in r["nodes"]}
    owners = {(rc["context"], rc["caller_nid"]) for rc in calls}
    # Body prose belongs to the enclosing heading; the first paragraph to the H1.
    assert ("Widget", heading_ids["Guide"]) in owners
    assert ("Widget", heading_ids["Rendering"]) in owners
    dotted = next(rc for rc in calls if rc["context"] == "Widget.render()")
    assert (dotted["caller_nid"], dotted["callee"]) == (heading_ids["Rendering"], "render")
    pinned = next(rc for rc in calls if rc["context"] == "src/widget.py::Widget::render")
    assert (pinned["path"], pinned["qualifiers"], pinned["callee"]) == (
        "src/widget.py", ["Widget"], "render")
    assert pinned["caller_nid"] == heading_ids["Pinned"]
    assert pinned["source_location"] == "L15"
    # Fenced code is not prose: `print(Widget)` inside the block adds nothing.
    assert [rc for rc in calls if rc["source_location"] == "L10"] == []
    # One raw call per (owner, mention), however often the heading repeats it.
    assert len([rc for rc in calls if rc["callee"] == "Widget"
                and rc["caller_nid"] == heading_ids["Rendering"]]) == 1


def test_extract_markdown_heading_code_span_belongs_to_that_heading(tmp_path):
    doc = tmp_path / "api.md"
    doc.write_text("# API\n\n## `Widget`\n\nText.\n")

    r = extract_markdown(doc)

    (rc,) = r["raw_calls"]
    heading = next(n for n in r["nodes"] if n["label"] == "`Widget`")
    assert (rc["caller_nid"], rc["callee"], rc["path"] if "path" in rc else None) == (
        heading["id"], "Widget", None)


def test_mentions_resolve_to_references_edges_end_to_end(tmp_path):
    r = _extract(tmp_path, {
        "src/widget.py": _WIDGET_PY,
        "src/gadget.py": _GADGET_PY,
        "docs/guide.md": _GUIDE_MD,
    })

    refs = _references(r)
    guide = _node(r, "Guide")
    rendering = _node(r, "Rendering")
    pinned = _node(r, "Pinned")
    widget = _node(r, "Widget", "widget.py")
    widget_render = next(
        n for n in r["nodes"] if n["label"] == ".render()" and "widget" in n["id"])
    gadget_helper = _node(r, "helper()", "gadget.py")

    # Bare unique name: INFERRED reference from the citing heading.
    assert refs[(guide["id"], widget["id"])]["confidence"] == "INFERRED"
    assert refs[(guide["id"], widget["id"])]["confidence_score"] == 0.95
    assert (rendering["id"], widget["id"]) in refs
    # `render` is defined twice, but the qualifier in `Widget.render()` names
    # the owner, so the mention resolves; the bare `helper()` stays ambiguous.
    assert {t for (s, t) in refs if s == rendering["id"]} == {
        widget["id"], widget_render["id"]}
    assert refs[(rendering["id"], widget_render["id"])]["confidence"] == "INFERRED"
    # Path-qualified mentions are EXTRACTED and scoped to the cited file.
    assert refs[(pinned["id"], widget_render["id"])]["confidence"] == "EXTRACTED"
    assert refs[(pinned["id"], widget_render["id"])]["confidence_score"] == 1.0
    assert refs[(pinned["id"], gadget_helper["id"])]["confidence"] == "EXTRACTED"
    # `../src/widget.py::Widget` resolves relative to the document.
    assert (pinned["id"], widget["id"]) in refs
    # A cited file that is not in the corpus yields nothing.
    assert {t for (s, t) in refs if s == pinned["id"]} == {
        widget_render["id"], gadget_helper["id"], widget["id"]}
    # Built-ins never resolve, and no mention becomes a call.
    node_ids = {n["id"] for n in r["nodes"]}
    assert all(s in node_ids and t in node_ids for (s, t) in refs)
    doc_ids = {n["id"] for n in r["nodes"] if n.get("file_type") == "document"}
    assert not [e for e in r["edges"]
                if e["relation"] in ("calls", "indirect_call") and e["source"] in doc_ids]


def test_ambiguous_bare_name_yields_no_edge(tmp_path):
    r = _extract(tmp_path, {
        "a/thing.py": "class Thing:\n    pass\n",
        "b/thing.py": "class Thing:\n    pass\n",
        "notes.md": "# Notes\n\nUse `Thing`.\n",
    })

    notes = _node(r, "Notes")
    assert {t for (s, t) in _references(r) if s == notes["id"]} == set()


def test_dotted_mentions_need_qualifier_evidence(tmp_path):
    r = _extract(tmp_path, {
        "src/widget.py": _WIDGET_PY + "\n\ndef sleep():\n    pass\n",
        "src/gadget.py": _GADGET_PY + "\n\ndef toml():\n    pass\n",
        "docs/notes.md": (
            "# Notes\n\n"
            "`time.sleep` and `pyproject.toml` are not this repo's sleep or toml.\n"
            "`widget.Widget`, `src.gadget.Gadget` and `Widget.render` are.\n"
            "`Gadget.helper` is not: `helper` is not owned by `Gadget`.\n"
        ),
    })

    notes = _node(r, "Notes")
    cited = {t for (s, t) in _references(r) if s == notes["id"]}
    widget = _node(r, "Widget", "widget.py")
    gadget = _node(r, "Gadget", "gadget.py")
    widget_render = next(
        n for n in r["nodes"] if n["label"] == ".render()" and "widget" in n["id"])
    assert cited == {widget["id"], gadget["id"], widget_render["id"]}


def test_mentions_survive_a_rebuild_over_an_existing_graph(tmp_path):
    """The watch reconcile owns authored ``[link](file)`` edges, not mentions.

    A rebuild over an existing graph re-parses the Markdown corpus and prunes
    any ``references`` edge it did not author; a code-span mention targets a
    code symbol, never a file, so it must survive a no-change rebuild and the
    incremental rebuilds of either side.
    """
    from graphify.watch import _rebuild_code

    corpus = tmp_path / "corpus"
    corpus.mkdir()
    (corpus / "widget.py").write_text(_WIDGET_PY)
    doc = corpus / "doc.md"
    doc.write_text("# Doc\n\n## Usage\n\nBuild a `Widget`.\n")
    graph_path = corpus / "graphify-out" / "graph.json"

    def mention_edges():
        links = json.loads(graph_path.read_text(encoding="utf-8"))["links"]
        return {(e["source"], e["target"]) for e in links
                if e.get("relation") == "references" and e.get("confidence_score")}

    assert _rebuild_code(corpus, no_cluster=True, acquire_lock=False) is True
    expected = mention_edges()
    assert len(expected) == 1

    assert _rebuild_code(corpus, no_cluster=True, acquire_lock=False) is True
    assert mention_edges() == expected, "no-change rebuild"

    doc.write_text(doc.read_text() + "\nStill a `Widget`.\n")
    assert _rebuild_code(corpus, changed_paths=[doc], no_cluster=True,
                         acquire_lock=False) is True
    assert mention_edges() == expected, "document re-extracted"

    (corpus / "widget.py").write_text(_WIDGET_PY + "\n\ndef extra():\n    pass\n")
    assert _rebuild_code(corpus, changed_paths=[corpus / "widget.py"], no_cluster=True,
                         acquire_lock=False) is True
    assert mention_edges() == expected, "code re-extracted"


def test_mentions_survive_the_extraction_cache(tmp_path):
    files = {"src/widget.py": _WIDGET_PY, "docs/guide.md": _GUIDE_MD}
    first = _extract(tmp_path, files)
    second = _extract(tmp_path, files)

    def _pairs(r):
        return {(s, t) for (s, t) in _references(r)}

    assert _pairs(first) == _pairs(second)
    guide = _node(second, "Guide")
    widget = _node(second, "Widget", "widget.py")
    assert (guide["id"], widget["id"]) in _pairs(second)


def test_bare_lowercase_word_does_not_link_to_an_unrelated_method(tmp_path):
    """`redis` the server is prose, not a reference to whichever method is named redis (#4609)."""
    r = _extract(tmp_path, {
        "cache.py": "class Cache:\n    def redis(self):\n        return 'connection'\n",
        "README.md": "# Queue\n\nJobs run on `redis` (the server, not our code).\n",
    })

    queue = _node(r, "Queue")
    assert {t for (s, t) in _references(r) if s == queue["id"]} == set()


def test_bare_method_mention_survives_when_the_document_cites_its_class(tmp_path):
    """`successWithWarnings` next to `HandlerResult` is a real reference (#4609)."""
    r = _extract(tmp_path, {
        "handler.py": "class HandlerResult:\n    def successWithWarnings(self):\n        return 1\n",
        "notes.md": "# Notes\n\n`HandlerResult` returns `successWithWarnings`.\n",
    })

    notes = _node(r, "Notes")
    method = _node(r, ".successWithWarnings()")
    assert (notes["id"], method["id"]) in _references(r)


def test_bare_method_with_parentheses_still_resolves(tmp_path):
    """A trailing () is explicit evidence, so the owner does not have to be cited (#4609)."""
    r = _extract(tmp_path, {
        "cache.py": "class Cache:\n    def redis(self):\n        return 'connection'\n",
        "notes.md": "# Notes\n\nCall `redis()` on the cache.\n",
    })

    notes = _node(r, "Notes")
    method = _node(r, ".redis()")
    assert (notes["id"], method["id"]) in _references(r)


def test_bare_function_mention_still_resolves_without_its_owner(tmp_path):
    """The extra owner test is scoped to methods; a free function label stays evidence (#4609)."""
    r = _extract(tmp_path, {
        "deploy.py": "def deploy():\n    pass\n",
        "notes.md": "# Notes\n\nRun `deploy` after the tests.\n",
    })

    notes = _node(r, "Notes")
    deploy = _node(r, "deploy()", "deploy.py")
    assert (notes["id"], deploy["id"]) in _references(r)


def test_owner_cited_in_another_document_does_not_count(tmp_path):
    """The owner evidence is per document: one doc's mention cannot license another's (#4609)."""
    r = _extract(tmp_path, {
        "handler.py": "class HandlerResult:\n    def successWithWarnings(self):\n        return 1\n",
        "a.md": "# A\n\n`HandlerResult` is the result type.\n",
        "b.md": "# B\n\nReads `successWithWarnings`.\n",
    })

    b = _node(r, "B")
    assert {t for (s, t) in _references(r) if s == b["id"]} == set()


def test_owner_evidence_survives_an_edge_that_already_exists():
    """A mention whose edge is already in the graph still counts as citing its target.

    The resolver skips an edge that is already there, but the document has still
    cited that symbol, so the evidence must stay on record for a later method
    mention in the same document (#4609, review finding on the PR).
    """
    from graphify.markdown_resolution import resolve_markdown_mentions

    per_file = [{"raw_calls": [
        {"caller_nid": "doc_notes", "callee": "HandlerResult", "language": "markdown",
         "context": "HandlerResult", "source_file": "notes.md", "source_location": "L3"},
        {"caller_nid": "doc_notes", "callee": "successWithWarnings", "language": "markdown",
         "context": "successWithWarnings", "source_file": "notes.md", "source_location": "L3"},
    ]}]
    nodes = [
        {"id": "doc_notes", "label": "Notes", "file_type": "document",
         "source_file": "notes.md"},
        {"id": "handler_handlerresult", "label": "HandlerResult", "file_type": "code",
         "_callable": True, "_callable_class": True, "source_file": "handler.py"},
        {"id": "handler_handlerresult_successwithwarnings", "label": ".successWithWarnings()",
         "file_type": "code", "_callable": True, "source_file": "handler.py"},
    ]
    edges = [
        {"source": "handler_handlerresult",
         "target": "handler_handlerresult_successwithwarnings", "relation": "method"},
        # The class reference edge is already in the graph.
        {"source": "doc_notes", "target": "handler_handlerresult", "relation": "references"},
    ]

    resolve_markdown_mentions(per_file, nodes, edges)

    assert ("doc_notes", "handler_handlerresult_successwithwarnings") in {
        (e["source"], e["target"]) for e in edges if e.get("relation") == "references"}