"""Unit tests for pragent pilot diff_compress. No network."""
import os
import re
import sys

HERE = os.path.dirname(os.path.abspath(__file__))
ROOT = os.path.abspath(os.path.join(HERE, "..", "..", ".."))
sys.path.insert(0, os.path.join(ROOT, "pilot"))

import diff_compress  # noqa: E402
from diff_compress import compress_diff, extract_finding_bullets  # noqa: E402


# ---------------------------------------------------------------------------
# compress_diff
# ---------------------------------------------------------------------------


_DIFF = """\
diff --git a/src/a.py b/src/a.py
index 1..2 100644
--- a/src/a.py
+++ b/src/a.py
@@ -1,20 +1,21 @@
 ctx1
-removed
+added
 ctx2
 ctx3
 ctx4
 ctx5
 ctx6
 ctx7
 ctx8
 ctx9
 ctx10
 ctx11
 ctx12
 ctx13
 ctx14
 ctx15
 ctx16
+extra
 ctx17
@@ -20,3 +21,4 @@
 tail1
 tail2
+tail3
 tail4
diff --git a/binary.bin b/binary.bin
new file mode 100644
index 0..1
Binary files differ
"""


def test_compress_diff_default_context_two():
    text, orig, kept = compress_diff(_DIFF, context=2)
    # +/- lines preserved
    assert "+added" in text
    assert "-removed" in text
    assert "+extra" in text
    assert "+tail3" in text
    # 2 context lines around +/- kept, the rest collapsed
    assert "ctx2" in text and "ctx3" in text
    assert "ctx4" not in text  # outside the +/- window
    # Binary files pass through
    assert "Binary files differ" in text
    # File headers preserved
    assert "diff --git a/src/a.py b/src/a.py" in text
    assert orig > kept


def test_compress_diff_context_zero_strips_context():
    text, orig, kept = compress_diff(_DIFF, context=0)
    assert "+added" in text and "-removed" in text and "+extra" in text
    # Context lines dropped (only +/- survive)
    assert " ctx1" not in text
    assert "ctx2" not in text
    assert orig > kept


def test_compress_diff_negative_disables_compression():
    text, orig, kept = compress_diff(_DIFF, context=-1)
    assert text == _DIFF
    assert orig == kept


def test_compress_diff_collapsed_gap_splits_into_two_hunks():
    # Two +/- lines separated by 14 context lines, context=2. The dropped
    # middle is expressed by SPLITTING the hunk in two, each with a recomputed
    # `@@` header — not by a pseudo-marker line. `parse_diff_anchors` reads
    # `@@` headers to reset its line counter, so anything that looks like a
    # header but isn't one silently misanchors every following comment.
    middle = "\n".join(f" m{i}" for i in range(14)) + "\n"  # trailing \n!
    diff = (
        "diff --git a/x.py b/x.py\n"
        "--- a/x.py\n"
        "+++ b/x.py\n"
        "@@ -1,21 +1,23 @@\n"
        + " c1\n c2\n"           # ctx near +a (kept with context=2)
        + "+a\n"
        + middle
        + "+b\n"
        + " c1\n c2\n"           # ctx near +b (kept with context=2)
    )
    text, _, _ = compress_diff(diff, context=2)
    assert "+a" in text and "+b" in text
    for m in ("m2", "m3", "m4", "m5", "m6", "m7", "m8", "m9", "m10", "m11"):
        assert f" {m}\n" not in text  # the gap itself is gone
    # Two hunks, and every emitted header is a real unified-diff header.
    headers = [ln for ln in text.splitlines() if ln.startswith("@@")]
    assert len(headers) == 2
    assert all(re.match(r"^@@ -\d+,\d+ \+\d+,\d+ @@", h) for h in headers)


def test_compress_diff_strips_no_newline_marker():
    diff = (
        "diff --git a/x.py b/x.py\n"
        "--- a/x.py\n"
        "+++ b/x.py\n"
        "@@ -1,2 +1,2 @@\n"
        " a\n"
        "-b\n"
        "\\ No newline at end of file\n"
        "+c\n"
        "\\ No newline at end of file\n"
    )
    text, _, _ = compress_diff(diff, context=2)
    assert "\\ No newline" not in text
    assert "-b" in text and "+c" in text


def test_compress_diff_empty_and_none():
    text, orig, kept = compress_diff("", context=2)
    assert text == ""
    assert orig == 0 and kept == 0
    text, orig, kept = compress_diff(None, context=2)  # type: ignore[arg-context]
    assert text == ""
    assert orig == 0 and kept == 0


def test_compress_diff_pure_context_hunk_drops_body():
    # A hunk that's *only* context lines (rare but legal — `git diff` emits
    # these when the post-image differs only in whitespace outside the visible
    # hunk) collapses entirely: file headers stay, the empty hunk header
    # itself drops. The reviewer doesn't need to re-read unchanged code.
    diff = (
        "diff --git a/x.py b/x.py\n"
        "--- a/x.py\n"
        "+++ b/x.py\n"
        "@@ -1,3 +1,3 @@\n"
        " a\n"
        " b\n"
        " c\n"
    )
    text, _, _ = compress_diff(diff, context=2)
    assert text == "diff --git a/x.py b/x.py\n--- a/x.py\n+++ b/x.py\n"
    assert "@@ -1,3" not in text  # empty hunk header dropped


def test_compress_diff_wide_window_keeps_more_context():
    narrow, _, _ = compress_diff(_DIFF, context=0)
    wide, _, wide_kept = compress_diff(_DIFF, context=10)
    assert wide_kept > len(narrow)


# ---------------------------------------------------------------------------
# extract_finding_bullets
# ---------------------------------------------------------------------------


_BODY = """\
🤖 **AI Review** · pragent pilot · glm-5.2:cloud · `abcdef12`

Adds the salvavoid void-death item-rescue module. Risk is moderate on the
PlayerDeathEvent item/inventory path. New findings (not in prior review):
orphaned chest left in world on rescue failure, missing module-enabled check.

- **[HIGH]** `src/main/java/dev/marcospaulo/canalhandia/VoidProtection.java:162` — drop duplication race. fix: use ItemMeta to write inventory once. (ref: https://example.com)
- **[MEDIUM]** `src/main/java/dev/marcospaulo/canalhandia/VoidProtection.java:67` — O(n^2) spiral. fix: cap radius. (https://example.com/spiral)
- **[LOW]** `src/main/java/dev/marcospaulo/canalhandia/VoidProtection.java:3` — package-info javadoc missing.

_4 inline comment(s) posted below._
<!-- pragent:sha=abcdef1234567890 -->
"""


def test_extract_finding_bullets_basic():
    bs = extract_finding_bullets(_BODY)
    assert len(bs) == 3
    assert any("HIGH" in b and "VoidProtection.java:162" in b for b in bs)
    assert any("MEDIUM" in b for b in bs)
    assert any("LOW" in b for b in bs)


def test_extract_finding_bullets_drops_prose():
    bs = extract_finding_bullets(_BODY)
    joined = "\n".join(bs)
    # The summary prose is dropped.
    assert "Adds the salvavoid" not in joined
    assert "PlayerDeathEvent item/inventory path" not in joined
    # The inline-comment footer is dropped.
    assert "inline comment(s) posted below" not in joined
    # The sha marker is dropped.
    assert "pragent:sha=" not in joined


def test_extract_finding_bullets_accepts_lowercase_summary_bullets():
    # `summary_bullets` renders `- **[HIGH]**` (bold); older reviews used
    # `- [high]` (plain). Both should match.
    text = (
        "- [critical] `a.py:1` — bug. fix: fix it.\n"
        "- **[HIGH]** `b.go:9` — race.\n"
    )
    bs = extract_finding_bullets(text)
    assert len(bs) == 2
    assert "CRITICAL" in bs[0].upper() or "critical" in bs[0]
    assert "HIGH" in bs[1]


def test_extract_finding_bullets_empty_and_prose_only():
    assert extract_finding_bullets("") == []
    assert extract_finding_bullets("   \n  \n") == []
    assert extract_finding_bullets("Just some prose, no bullets here.") == []
    assert extract_finding_bullets("- This is a regular bullet, not a finding.") == []


def test_extract_finding_bullets_keeps_indented_subbullets():
    # A finding may carry continuation lines below it (rare in pragent output
    # but legal). We only pull the matching line itself — sub-bullets stay
    # with their parent as prose.
    text = (
        "- **[HIGH]** `a.py:1` — bug.\n"
        "  sub-bullet continuation that the reviewer wrote\n"
        "- **[LOW]** `b.go:2` — nit.\n"
    )
    bs = extract_finding_bullets(text)
    assert len(bs) == 2
    assert all("sub-bullet continuation" not in b for b in bs)


def test_compress_diff_preserves_anchors_for_post_change_lines():
    # Sanity: a finding anchored on a context line that compress_diff keeps
    # must still be a valid anchor after compression. We re-run the parser the
    # ai_review core uses, so a regression here surfaces as misanchored
    # inline comments in production.
    import ai_review
    diff = (
        "diff --git a/x.py b/x.py\n"
        "--- a/x.py\n"
        "+++ b/x.py\n"
        "@@ -10,4 +10,5 @@\n"
        " ctx_a\n"
        " ctx_b\n"
        "+new\n"
        " ctx_c\n"
        " ctx_d\n"
    )
    text, _, _ = compress_diff(diff, context=1)
    anchors = ai_review.parse_diff_anchors(text)
    assert 12 in anchors["x.py"]  # +new
    # ctx_a is within 1 line of +new at line 12, so kept.
    assert 11 in anchors["x.py"]

def test_compress_diff_keeps_post_change_line_numbers_exact():
    # The regression that motivated the hunk-header rewrite: dropping context
    # lines without renumbering shifted every anchor. Here `+new` really is
    # line 10 of the post-change file; compression must not move it.
    raw = (
        "diff --git a/x.py b/x.py\n"
        "--- a/x.py\n"
        "+++ b/x.py\n"
        "@@ -1,12 +1,12 @@\n"
        + "".join(f" l{i}\n" for i in range(1, 10))
        + "-old\n"
        + "+new\n"
        + " l11\n"
    )
    import ai_review
    raw_anchors = ai_review.parse_diff_anchors(raw)["x.py"]
    assert 10 in raw_anchors  # +new
    text, _, _ = compress_diff(raw, context=1)
    comp_anchors = ai_review.parse_diff_anchors(text)["x.py"]
    # Compression only ever drops anchors; it never invents or moves one.
    assert comp_anchors <= raw_anchors
    assert 10 in comp_anchors  # +new still anchors to its real line


def test_compress_diff_content_line_starting_with_dashes_is_not_a_header():
    # A removed YAML document separator renders as `----`; an added one as
    # `+++new`. Treating those as file headers truncated the hunk body and
    # dropped the `@@` header with it.
    diff = (
        "diff --git a/x.yml b/x.yml\n"
        "--- a/x.yml\n"
        "+++ b/x.yml\n"
        "@@ -1,4 +1,4 @@\n"
        " a: 1\n"
        " b: 2\n"
        "----\n"
        "+++new\n"
        " c: 3\n"
    )
    text, _, _ = compress_diff(diff, context=1)
    assert "----" in text and "+++new" in text
    # The hunk header survives, so the body is still anchorable.
    headers = [ln for ln in text.splitlines() if _is_hunk_header(ln)]
    assert len(headers) == 1
    import ai_review
    assert ai_review.parse_diff_anchors(text)["x.yml"] == {2, 3, 4}


def _is_hunk_header(line: str) -> bool:
    return bool(re.match(r"^@@ -\d+,\d+ \+\d+,\d+ @@", line))


def test_extract_finding_bullets_matches_current_renderer_output():
    # The prior-review dedupe is only worth anything if it can read the
    # bullets pragent itself posts. `summary_bullets` renders an emoji badge
    # between the `-` and the `[SEV]` tag, which the original regex rejected.
    import ai_review
    findings = [
        {"path": "a.py", "line": 10, "severity": "high",
         "problem": "boom", "fix": "guard it", "suggestion": "", "reference": ""},
        {"path": "b.go", "line": 0, "severity": "low",
         "problem": "nit", "fix": "", "suggestion": "", "reference": ""},
    ]
    body = ai_review.format_review_body(
        ai_review.summary_bullets(findings), "m", "abc123",
        findings_for_table=findings,
    )
    bullets = extract_finding_bullets(body)
    assert len(bullets) == 2
    assert any("a.py:10" in b and "boom" in b for b in bullets)
    # `**Fix:**` continuation lines are prose, not findings.
    assert all("**Fix:**" not in b for b in bullets)
    assert ai_review.compact_prior_reviews([body]) != []