#!/bin/sh
# graphify-hook-start
# Auto-rebuilds the knowledge graph after each commit (code files only, no LLM needed).
# Installed by: graphify hook install

# Deterministic clustering: networkx louvain iterates string-keyed sets whose
# order is randomized per-process by PYTHONHASHSEED, so community assignments
# churn run-to-run. Pinning it makes graphify-out reproducible.
export PYTHONHASHSEED=0

# Skip during rebase/merge/cherry-pick to avoid blocking --continue with unstaged changes
GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
[ -d "$GIT_DIR/rebase-merge" ] && exit 0
[ -d "$GIT_DIR/rebase-apply" ] && exit 0
[ -f "$GIT_DIR/MERGE_HEAD" ] && exit 0
[ -f "$GIT_DIR/CHERRY_PICK_HEAD" ] && exit 0

[ "${GRAPHIFY_SKIP_HOOK:-0}" = "1" ] && exit 0

CHANGED=$(git diff --name-only HEAD~1 HEAD 2>/dev/null || git diff --name-only HEAD 2>/dev/null)
if [ -z "$CHANGED" ]; then
    exit 0
fi

# Skip when only graphify-out/ artifacts changed (avoids rebuild loop when graph outputs are tracked in git)
_NON_GRAPH=$(echo "$CHANGED" | grep -v '^graphify-out/' || true)
if [ -z "$_NON_GRAPH" ]; then
    exit 0
fi

# Detect the correct Python interpreter (handles uv tool, pipx, venv, system installs).
# _PINNED was recorded at hook-install time; tried first so the hook works even
# when the graphify launcher is not on PATH (common in GUI clients and CI).
GRAPHIFY_PYTHON=""
_PINNED='/Users/ksv741/.local/share/uv/tools/graphifyy/bin/python'
if [ -n "$_PINNED" ] && [ -x "$_PINNED" ] && "$_PINNED" -c "import graphify" 2>/dev/null; then
    GRAPHIFY_PYTHON="$_PINNED"
fi
# Second probe: read graphify-out/.graphify_python (written by the skill and
# CLI; survives uv-tool reinstalls and is the same source the README documents).
if [ -z "$GRAPHIFY_PYTHON" ]; then
    _GFY_PYTHON_FILE="graphify-out/.graphify_python"
    if [ -f "$_GFY_PYTHON_FILE" ]; then
        _FROM_FILE=$(cat "$_GFY_PYTHON_FILE" 2>/dev/null | tr -d '[:space:]')
        case "$_FROM_FILE" in
            *[!a-zA-Z0-9/_.@:\-]*) _FROM_FILE="" ;;  # allowlist (covers Windows paths)
        esac
        if [ -n "$_FROM_FILE" ] && [ -x "$_FROM_FILE" ] && "$_FROM_FILE" -c "import graphify" 2>/dev/null; then
            GRAPHIFY_PYTHON="$_FROM_FILE"
        fi
    fi
fi
# Third probe: resolve via the graphify launcher on PATH (shebang probe).
if [ -z "$GRAPHIFY_PYTHON" ]; then
    GRAPHIFY_BIN=$(command -v graphify 2>/dev/null)
    if [ -n "$GRAPHIFY_BIN" ]; then
        case "$GRAPHIFY_BIN" in
            *.exe) _SHEBANG="" ;;
            *)     _SHEBANG=$(head -1 "$GRAPHIFY_BIN" | sed 's/^#![[:space:]]*//') ;;
        esac
        case "$_SHEBANG" in
            */env\ *) GRAPHIFY_PYTHON="${_SHEBANG#*/env }" ;;
            *)         GRAPHIFY_PYTHON="$_SHEBANG" ;;
        esac
        # Allowlist: only keep characters valid in a filesystem path to prevent
        # injection if the shebang contains shell metacharacters.
        case "$GRAPHIFY_PYTHON" in
            *[!a-zA-Z0-9/_.@-]*) GRAPHIFY_PYTHON="" ;;
        esac
        if [ -n "$GRAPHIFY_PYTHON" ] && ! "$GRAPHIFY_PYTHON" -c "import graphify" 2>/dev/null; then
            GRAPHIFY_PYTHON=""
        fi
    fi
fi
# Last resort: try python3 / python (works for system/venv installs on PATH).
if [ -z "$GRAPHIFY_PYTHON" ]; then
    if command -v python3 >/dev/null 2>&1 && python3 -c "import graphify" 2>/dev/null; then
        GRAPHIFY_PYTHON="python3"
    elif command -v python >/dev/null 2>&1 && python -c "import graphify" 2>/dev/null; then
        GRAPHIFY_PYTHON="python"
    else
        echo "[graphify hook] could not locate a Python with graphify installed. Add the graphify bin dir to PATH or re-run 'graphify hook install' from the env where graphify lives." >&2
        exit 0
    fi
fi

export GRAPHIFY_CHANGED="$CHANGED"

# Run the rebuild detached so git commit returns immediately. Full-repo rebuilds
# can take hours; blocking the post-commit hook stalls the shell. The Python
# launcher below detaches the child cross-platform, so it works on Git for
# Windows' shell too (which lacks the coreutils backgrounding tools) (#1161).
_GRAPHIFY_LOG="${HOME}/.cache/graphify-rebuild.log"
mkdir -p "$(dirname "$_GRAPHIFY_LOG")"
export GRAPHIFY_REBUILD_LOG="$_GRAPHIFY_LOG"
echo "[graphify hook] launching background rebuild (log: $_GRAPHIFY_LOG)"
"$GRAPHIFY_PYTHON" -c "import os, subprocess, sys
_src = '''
import os, signal, sys
from pathlib import Path

changed_raw = os.environ.get('GRAPHIFY_CHANGED', '')
changed = [Path(f.strip()) for f in changed_raw.strip().splitlines() if f.strip()]

if not changed:
    sys.exit(0)

print(f'[graphify hook] {len(changed)} file(s) changed - rebuilding graph...')

try:
    from graphify.watch import _rebuild_code, _apply_resource_limits
    _apply_resource_limits()
    _timeout = int(os.environ.get('GRAPHIFY_REBUILD_TIMEOUT', '600'))
    if _timeout > 0 and hasattr(signal, 'SIGALRM'):
        signal.signal(signal.SIGALRM, lambda *_: (_ for _ in ()).throw(TimeoutError(f'graphify rebuild exceeded {_timeout}s')))
        signal.alarm(_timeout)
    _force = os.environ.get('GRAPHIFY_FORCE', '').lower() in ('1', 'true', 'yes')
    _root = Path('.')
    _saved = Path('graphify-out/.graphify_root')
    if _saved.exists():
        _txt = _saved.read_text(encoding='utf-8').strip()
        if _txt:
            _root = Path(_txt)
    _rebuild_code(_root, changed_paths=changed, force=_force)
except TimeoutError as exc:
    print(f'[graphify hook] {exc}')
    sys.exit(1)
except Exception as exc:
    print(f'[graphify hook] Rebuild failed: {exc}')
    sys.exit(1)

'''
_log = os.environ.get('GRAPHIFY_REBUILD_LOG') or os.path.join(os.path.expanduser('~'), '.cache', 'graphify-rebuild.log')
try:
    os.makedirs(os.path.dirname(_log), exist_ok=True)
    _out = open(_log, 'a', buffering=1, encoding='utf-8', errors='replace')
except OSError:
    _out = subprocess.DEVNULL
_kw = dict(stdout=_out, stderr=subprocess.STDOUT, stdin=subprocess.DEVNULL, cwd=os.getcwd(), close_fds=True)
_cmd = [sys.executable, '-c', _src]
if os.name == 'nt':
    _flags = 0x00000008 | 0x00000200  # DETACHED_PROCESS | CREATE_NEW_PROCESS_GROUP
    try:
        subprocess.Popen(_cmd, creationflags=_flags | 0x01000000, **_kw)  # + CREATE_BREAKAWAY_FROM_JOB
    except OSError:
        subprocess.Popen(_cmd, creationflags=_flags, **_kw)
else:
    subprocess.Popen(_cmd, start_new_session=True, **_kw)
"
# graphify-hook-end