"""Tests for ``muse status`` — working-tree diff and merge state display.

All DB-dependent tests use ``_status_async`` directly with an in-memory
SQLite session (via the ``muse_cli_db_session`` fixture in conftest.py)
so no real Postgres instance is required.

Async tests use ``@pytest.mark.anyio`` (configured for asyncio mode in
pyproject.toml).
"""
from __future__ import annotations

import json
import os
import pathlib
import uuid

import pytest
from sqlalchemy.ext.asyncio import AsyncSession

from maestro.muse_cli.commands.commit import _commit_async
from maestro.muse_cli.commands.status import _status_async
from maestro.muse_cli.errors import ExitCode


# ---------------------------------------------------------------------------
# Helpers (mirror commit test helpers to keep tests self-contained)
# ---------------------------------------------------------------------------


def _init_muse_repo(root: pathlib.Path, repo_id: str | None = None) -> str:
    """Create a minimal .muse/ layout."""
    rid = repo_id or str(uuid.uuid4())
    muse = root / ".muse"
    (muse / "refs" / "heads").mkdir(parents=True)
    (muse / "repo.json").write_text(
        json.dumps({"repo_id": rid, "schema_version": "1"})
    )
    (muse / "HEAD").write_text("refs/heads/main")
    (muse / "refs" / "heads" / "main").write_text("") # no commits yet
    return rid


def _populate_workdir(root: pathlib.Path, files: dict[str, bytes] | None = None) -> None:
    """Create muse-work/ with the given files."""
    workdir = root / "muse-work"
    workdir.mkdir(exist_ok=True)
    if files is None:
        files = {"beat.mid": b"MIDI-DATA"}
    for name, content in files.items():
        path = workdir / name
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_bytes(content)


# ---------------------------------------------------------------------------
# Clean working tree
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_clean_after_commit(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """After a commit with no subsequent changes, status reports a clean tree."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI"})

    await _commit_async(
        message="initial commit",
        root=tmp_path,
        session=muse_cli_db_session,
    )
    # Flush so the snapshot row is visible to _status_async in the same session.
    await muse_cli_db_session.flush()

    await _status_async(root=tmp_path, session=muse_cli_db_session)

    captured = capsys.readouterr()
    assert "nothing to commit, working tree clean" in captured.out


# ---------------------------------------------------------------------------
# Uncommitted changes
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_shows_modified_file(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """A file changed after the last commit appears as 'modified:'."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"VERSION1"})

    await _commit_async(
        message="initial",
        root=tmp_path,
        session=muse_cli_db_session,
    )
    await muse_cli_db_session.flush()

    # Modify the file without committing.
    (tmp_path / "muse-work" / "beat.mid").write_bytes(b"VERSION2")

    await _status_async(root=tmp_path, session=muse_cli_db_session)

    captured = capsys.readouterr()
    assert "modified:" in captured.out
    assert "beat.mid" in captured.out


@pytest.mark.anyio
async def test_status_shows_new_file(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """A file added to muse-work/ after the last commit appears as 'new file:'."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI"})

    await _commit_async(
        message="initial",
        root=tmp_path,
        session=muse_cli_db_session,
    )
    await muse_cli_db_session.flush()

    # Add a new file that was not in the committed snapshot.
    (tmp_path / "muse-work" / "lead.mp3").write_bytes(b"MP3")

    await _status_async(root=tmp_path, session=muse_cli_db_session)

    captured = capsys.readouterr()
    assert "new file:" in captured.out
    assert "lead.mp3" in captured.out


@pytest.mark.anyio
async def test_status_shows_deleted_file(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """A file removed from muse-work/ after the last commit appears as 'deleted:'."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI", "scratch.mid": b"TMP"})

    await _commit_async(
        message="initial",
        root=tmp_path,
        session=muse_cli_db_session,
    )
    await muse_cli_db_session.flush()

    # Remove one file without committing.
    (tmp_path / "muse-work" / "scratch.mid").unlink()

    await _status_async(root=tmp_path, session=muse_cli_db_session)

    captured = capsys.readouterr()
    assert "deleted:" in captured.out
    assert "scratch.mid" in captured.out


# ---------------------------------------------------------------------------
# Untracked files (no commits yet)
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_shows_untracked(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """Files in muse-work/ on a branch with no commits are listed as untracked."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI", "lead.mp3": b"MP3"})

    # Do NOT commit — branch has no history.
    await _status_async(root=tmp_path, session=muse_cli_db_session)

    captured = capsys.readouterr()
    assert "Untracked files" in captured.out
    assert "beat.mid" in captured.out
    assert "lead.mp3" in captured.out


# ---------------------------------------------------------------------------
# In-progress merge
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_during_merge_shows_conflicts(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """When MERGE_STATE.json is present, conflict paths appear with 'both modified:'."""
    _init_muse_repo(tmp_path)

    merge_state = {
        "base_commit": "abc123",
        "ours_commit": "def456",
        "theirs_commit": "789abc",
        "conflict_paths": ["beat.mid", "lead.mp3"],
        "other_branch": "feature/variation-b",
    }
    (tmp_path / ".muse" / "MERGE_STATE.json").write_text(json.dumps(merge_state))

    await _status_async(root=tmp_path, session=muse_cli_db_session)

    captured = capsys.readouterr()
    assert "You have unmerged paths" in captured.out
    assert "both modified:" in captured.out
    assert "beat.mid" in captured.out
    assert "lead.mp3" in captured.out


# ---------------------------------------------------------------------------
# No commits yet (clean working tree)
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_no_commits_yet(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """A repo with no commits and no muse-work/ files shows 'no commits yet'."""
    _init_muse_repo(tmp_path)
    # No muse-work/ directory, no commits.

    await _status_async(root=tmp_path, session=muse_cli_db_session)

    captured = capsys.readouterr()
    assert "no commits yet" in captured.out


# ---------------------------------------------------------------------------
# Outside a repo
# ---------------------------------------------------------------------------


def test_status_outside_repo_exits_2(tmp_path: pathlib.Path) -> None:
    """``muse status`` exits 2 when there is no ``.muse/`` directory."""
    from typer.testing import CliRunner

    from maestro.muse_cli.app import cli

    runner = CliRunner()

    prev = os.getcwd()
    try:
        os.chdir(tmp_path)
        result = runner.invoke(cli, ["status"], catch_exceptions=False)
    finally:
        os.chdir(prev)

    assert result.exit_code == int(ExitCode.REPO_NOT_FOUND)
    assert "not a muse repository" in result.output.lower()


# ---------------------------------------------------------------------------
# --short flag
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_short_shows_modified_code(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--short emits 'M path' for a modified file (no verbose labels)."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"V1"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "beat.mid").write_bytes(b"V2")

    await _status_async(root=tmp_path, session=muse_cli_db_session, short=True)

    out = capsys.readouterr().out
    assert "M beat.mid" in out
    assert "modified:" not in out # verbose label must not appear


@pytest.mark.anyio
async def test_status_short_shows_added_code(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--short emits 'A path' for an added file."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "lead.mp3").write_bytes(b"MP3")

    await _status_async(root=tmp_path, session=muse_cli_db_session, short=True)

    out = capsys.readouterr().out
    assert "A lead.mp3" in out


@pytest.mark.anyio
async def test_status_short_shows_deleted_code(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--short emits 'D path' for a deleted file."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI", "scratch.mid": b"TMP"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "scratch.mid").unlink()

    await _status_async(root=tmp_path, session=muse_cli_db_session, short=True)

    out = capsys.readouterr().out
    assert "D scratch.mid" in out


@pytest.mark.anyio
async def test_status_short_untracked_shows_question_mark(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--short emits '? path' for untracked files (no commits yet)."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI"})

    await _status_async(root=tmp_path, session=muse_cli_db_session, short=True)

    out = capsys.readouterr().out
    assert "? beat.mid" in out


# ---------------------------------------------------------------------------
# --branch flag
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_branch_only_shows_branch_line(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--branch emits only the 'On branch <name>' line with no file listing."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"V1"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "beat.mid").write_bytes(b"V2")

    await _status_async(root=tmp_path, session=muse_cli_db_session, branch_only=True)

    out = capsys.readouterr().out
    assert "On branch main" in out
    assert "beat.mid" not in out # no file listing
    assert "modified" not in out


@pytest.mark.anyio
async def test_status_branch_only_no_commits(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--branch on a repo with no commits shows the branch name."""
    _init_muse_repo(tmp_path)

    await _status_async(root=tmp_path, session=muse_cli_db_session, branch_only=True)

    out = capsys.readouterr().out
    assert "On branch main" in out
    assert "no commits" not in out # branch_only suppresses extra info


# ---------------------------------------------------------------------------
# --porcelain flag
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_porcelain_header_emitted(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--porcelain emits '## <branch>' as the first line of status output."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"V1"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()
    capsys.readouterr() # discard commit's success line

    await _status_async(root=tmp_path, session=muse_cli_db_session, porcelain=True)

    out = capsys.readouterr().out
    assert out.startswith("## main")


@pytest.mark.anyio
async def test_status_porcelain_clean_tree(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--porcelain with a clean working tree emits only the '## branch' header."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()
    capsys.readouterr() # discard commit's success line

    await _status_async(root=tmp_path, session=muse_cli_db_session, porcelain=True)

    out = capsys.readouterr().out.strip()
    assert out == "## main"


@pytest.mark.anyio
async def test_status_porcelain_modified_file(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--porcelain emits ' M path' (two-char code) for a modified file."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"V1"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "beat.mid").write_bytes(b"V2")

    await _status_async(root=tmp_path, session=muse_cli_db_session, porcelain=True)

    out = capsys.readouterr().out
    assert " M beat.mid" in out


@pytest.mark.anyio
async def test_status_porcelain_added_file(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--porcelain emits ' A path' for an added file."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "lead.mp3").write_bytes(b"MP3")

    await _status_async(root=tmp_path, session=muse_cli_db_session, porcelain=True)

    out = capsys.readouterr().out
    assert " A lead.mp3" in out


@pytest.mark.anyio
async def test_status_porcelain_deleted_file(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--porcelain emits ' D path' for a deleted file."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI", "scratch.mid": b"TMP"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "scratch.mid").unlink()

    await _status_async(root=tmp_path, session=muse_cli_db_session, porcelain=True)

    out = capsys.readouterr().out
    assert " D scratch.mid" in out


@pytest.mark.anyio
async def test_status_porcelain_untracked(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--porcelain emits '?? path' for untracked files."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"MIDI"})

    await _status_async(root=tmp_path, session=muse_cli_db_session, porcelain=True)

    out = capsys.readouterr().out
    assert "?? beat.mid" in out


# ---------------------------------------------------------------------------
# --sections flag
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_sections_groups_by_first_dir(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--sections groups changed files under '## <dir>' headers by first path component."""
    _init_muse_repo(tmp_path)
    _populate_workdir(
        tmp_path,
        {
            "verse/bass.mid": b"V1",
            "chorus/bass.mid": b"V1",
        },
    )

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    # Modify one file per section.
    (tmp_path / "muse-work" / "verse" / "bass.mid").write_bytes(b"V2")
    (tmp_path / "muse-work" / "chorus" / "bass.mid").write_bytes(b"V2")

    await _status_async(root=tmp_path, session=muse_cli_db_session, sections=True)

    out = capsys.readouterr().out
    assert "## chorus" in out
    assert "## verse" in out
    assert "chorus/bass.mid" in out
    assert "verse/bass.mid" in out


@pytest.mark.anyio
async def test_status_sections_root_files_ungrouped(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """Files directly in muse-work/ (no sub-dir) appear under '## (root)' when --sections is active."""
    _init_muse_repo(tmp_path)
    _populate_workdir(tmp_path, {"beat.mid": b"V1"})

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "beat.mid").write_bytes(b"V2")

    await _status_async(root=tmp_path, session=muse_cli_db_session, sections=True)

    out = capsys.readouterr().out
    assert "## (root)" in out
    assert "beat.mid" in out


# ---------------------------------------------------------------------------
# --tracks flag
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_tracks_groups_by_first_dir(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--tracks groups changed files under '## <dir>' headers by first path component."""
    _init_muse_repo(tmp_path)
    _populate_workdir(
        tmp_path,
        {
            "drums/verse.mid": b"V1",
            "bass/verse.mid": b"V1",
        },
    )

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "drums" / "verse.mid").write_bytes(b"V2")
    (tmp_path / "muse-work" / "bass" / "verse.mid").write_bytes(b"V2")

    await _status_async(root=tmp_path, session=muse_cli_db_session, tracks=True)

    out = capsys.readouterr().out
    assert "## bass" in out
    assert "## drums" in out
    assert "bass/verse.mid" in out
    assert "drums/verse.mid" in out


# ---------------------------------------------------------------------------
# Flag combinations
# ---------------------------------------------------------------------------


@pytest.mark.anyio
async def test_status_short_and_sections_combined(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--short --sections emits short-format codes within section group headers."""
    _init_muse_repo(tmp_path)
    _populate_workdir(
        tmp_path,
        {
            "verse/bass.mid": b"V1",
            "chorus/drums.mid": b"V1",
        },
    )

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "verse" / "bass.mid").write_bytes(b"V2")
    (tmp_path / "muse-work" / "chorus" / "drums.mid").write_bytes(b"V2")

    await _status_async(root=tmp_path, session=muse_cli_db_session, short=True, sections=True)

    out = capsys.readouterr().out
    assert "## verse" in out
    assert "## chorus" in out
    assert "M verse/bass.mid" in out
    assert "M chorus/drums.mid" in out
    # verbose labels must not appear
    assert "modified:" not in out


@pytest.mark.anyio
async def test_status_porcelain_and_tracks_combined(
    tmp_path: pathlib.Path,
    muse_cli_db_session: AsyncSession,
    capsys: pytest.CaptureFixture[str],
) -> None:
    """--porcelain --tracks emits porcelain codes within track group headers."""
    _init_muse_repo(tmp_path)
    _populate_workdir(
        tmp_path,
        {
            "bass/line.mid": b"V1",
            "keys/pad.mid": b"V1",
        },
    )

    await _commit_async(message="initial", root=tmp_path, session=muse_cli_db_session)
    await muse_cli_db_session.flush()

    (tmp_path / "muse-work" / "bass" / "line.mid").write_bytes(b"V2")

    await _status_async(root=tmp_path, session=muse_cli_db_session, porcelain=True, tracks=True)

    out = capsys.readouterr().out
    assert "## main" in out # porcelain header
    assert "## bass" in out
    assert " M bass/line.mid" in out # two-char porcelain code