#!/usr/bin/env bash
# bump-build-version.sh — git pre-commit hook.
#
# Auto-increments the minor of BUILD_REDBEAR_VERSION in
# local/scripts/build-redbear.sh whenever that file is part of the commit.
# The version starts at 1.0 and bumps to 1.1, 1.2, … on every committed change,
# so the version printed at build start always reflects how many times the
# orchestrator has changed. No manual editing of the minor is needed.
#
# Installed via: ./local/scripts/install-git-hooks.sh --all
# Bypass a single commit with: git commit --no-verify
#
# Limitation: re-staging happens at whole-file granularity, so a partial
# (`git add -p`) stage of build-redbear.sh will be promoted to the full file.
# That is the standard trade-off for a re-staging pre-commit hook.

set -euo pipefail

REPO_ROOT="$(git rev-parse --show-toplevel 2>/dev/null)" || exit 0
FILE="local/scripts/build-redbear.sh"

# Only act if the build script is actually staged for this commit.
if ! git diff --cached --name-only -- "$FILE" | grep -qx "$FILE"; then
    exit 0
fi

# Read the version from the STAGED content (what will actually be committed).
cur="$(git show ":$FILE" 2>/dev/null \
        | grep -m1 -oE 'BUILD_REDBEAR_VERSION="[0-9]+\.[0-9]+"' \
        | grep -oE '[0-9]+\.[0-9]+' || true)"
if [ -z "$cur" ]; then
    # Version constant not found (unexpected) — do not block the commit.
    exit 0
fi

major="${cur%%.*}"
minor="${cur#*.}"
new="${major}.$((minor + 1))"

# Update the working-tree file and re-stage so the commit records the bump.
sed -i -E "s/^BUILD_REDBEAR_VERSION=\"[0-9]+\.[0-9]+\"/BUILD_REDBEAR_VERSION=\"${new}\"/" \
    "$REPO_ROOT/$FILE"
git add "$FILE"
echo "bump-build-version: build-redbear.sh ${cur} -> ${new}"
exit 0