#!/usr/bin/env bash
set -Eeuo pipefail

REPO_ROOT="$(git rev-parse --show-toplevel)"
cd "$REPO_ROOT"

mapfile -d '' staged_files < <(
    git diff --cached --name-only --diff-filter=ACMRDTUXB -z
)

if (( ${#staged_files[@]} == 0 )); then
    echo "No staged files; commit regression tests are not required."
    exit 0
fi

staged_rust_sources=()
for path in "${staged_files[@]}"; do
    printf '  staged input: %s\n' "$path"
    if [[ "$path" == *.rs && -f "$path" ]]; then
        staged_rust_sources+=("$path")
    fi
done

dirty_inputs=()
while IFS= read -r -d '' path; do
    dirty_inputs+=("$path")
done < <(git diff --name-only --diff-filter=ACMRDTUXB -z)
while IFS= read -r -d '' path; do
    dirty_inputs+=("$path")
done < <(git ls-files --others --exclude-standard -z)

if (( ${#dirty_inputs[@]} > 0 )); then
    echo "Commit blocked: unstaged or untracked files would make staged test results ambiguous:" >&2
    printf '  %s\n' "${dirty_inputs[@]}" >&2
    echo "Stage or remove those files, then retry the commit." >&2
    exit 1
fi

command -v cargo >/dev/null 2>&1 || {
    echo "Commit blocked: cargo is unavailable." >&2
    exit 1
}

if (( ${#staged_rust_sources[@]} > 0 )); then
    echo "Checking staged Rust source formatting..."
    rustfmt --edition 2021 --check "${staged_rust_sources[@]}"
fi

echo "Running deterministic workspace tests..."
cargo check --locked --workspace --exclude hcie-io --examples
cargo test --locked --workspace --exclude hcie-io --lib --tests -- \
    --skip benchmark_4k_stroke_on_multilayer_document

echo "Mandatory Rust regression gate passed."