#!/usr/bin/env bash
# Pre-commit hook: keep .agents/skills/oci-deal-accelerator/SKILL.md
# byte-aligned with the root SKILL.md (the source of truth that
# CLAUDE.md / Claude Code reads). The Codex copy under .agents/
# follows the same content with an auto-generated banner — they MUST
# stay in lock-step or Claude Code and Codex will give the user
# different instructions.
#
# Behavior:
#   • If SKILL.md is staged but the .agents/ copy is not synced,
#     auto-run scripts/sync-skill.py and stage the result so the
#     commit ships both files together.
#   • If the script can't run (no python, etc.), abort with a clear
#     message rather than committing a desync silently.
#
# Install once per clone:   make install-hooks   (sets core.hooksPath)

set -euo pipefail

ROOT="$(git rev-parse --show-toplevel)"
SOURCE="SKILL.md"
TARGET=".agents/skills/oci-deal-accelerator/SKILL.md"
SCRIPT="scripts/sync-skill.py"

# Only act when SKILL.md is part of the staged change set.
if ! git diff --cached --name-only | grep -qx "$SOURCE"; then
    exit 0
fi

if [ ! -f "$ROOT/$SCRIPT" ]; then
    echo "pre-commit: $SCRIPT missing — cannot verify SKILL.md sync. Aborting." >&2
    exit 1
fi

PYTHON="$(command -v python3 || command -v python || true)"
if [ -z "$PYTHON" ]; then
    echo "pre-commit: no python found in PATH — cannot run $SCRIPT. Aborting." >&2
    exit 1
fi

# Run the full sync, then stage the regenerated target so it travels
# in the same commit. (Idempotent — if it was already in sync, the
# file write is a no-op.)
"$PYTHON" "$ROOT/$SCRIPT" >&2
git add "$ROOT/$TARGET"

# Final check — if for any reason the result still drifts, fail loud.
if ! "$PYTHON" "$ROOT/$SCRIPT" --check >/dev/null 2>&1; then
    echo "pre-commit: SKILL.md and $TARGET are still out of sync after auto-run." >&2
    echo "             Investigate scripts/sync-skill.py before committing." >&2
    exit 1
fi

exit 0