#!/bin/sh
# Pre-commit hook for nescript
# Install: cp scripts/pre-commit .git/hooks/pre-commit && chmod +x .git/hooks/pre-commit

set -e

echo "Running pre-commit checks..."

echo "  Checking formatting..."
cargo fmt --all -- --check

echo "  Running clippy..."
cargo clippy --all-targets -- -D warnings

echo "  Running tests..."
cargo test --all-targets

# Committed ROMs must match their .ne sources — the compiler is
# deterministic, so any example whose on-disk .nes differs from a
# fresh build means someone edited the .ne file but forgot to
# rebuild. Rebuild each to a tmp path and fail if any differ, then
# point the user at the exact `cargo run` command to fix it.
echo "  Checking committed ROMs match .ne sources..."
cargo build --release --quiet
tmp=$(mktemp -d)
trap 'rm -rf "$tmp"' EXIT
stale=0
for f in examples/*.ne; do
    name=$(basename "$f" .ne)
    ./target/release/nescript build "$f" --output "$tmp/$name.nes" >/dev/null
    if ! cmp -s "examples/$name.nes" "$tmp/$name.nes"; then
        echo "    STALE: examples/$name.nes"
        echo "           rerun: cargo run --release -- build $f"
        stale=1
    fi
done
if [ $stale -ne 0 ]; then
    echo "one or more committed ROMs are out of date"
    exit 1
fi

# Only rebuild docs/{platformer,war}.gif when the underlying
# example sources, the gif recorder, or the harness changed — gif
# regeneration takes ~20s per gif due to puppeteer's cold start,
# so we don't want to pay it on every commit. Skipped entirely if
# node_modules isn't installed in the emulator harness; the CI
# `emulator` job is the authoritative check.
#
# `examples/war.ne` pulls in `examples/war/*.ne` via include
# directives, so any file under `examples/war/` is treated as a
# trigger for rebuilding the war gif — the parser's preprocess
# pass sees them as part of the same translation unit.
changed_files=$(git diff --cached --name-only)
recorder_or_harness_changed=0
if echo "$changed_files" | grep -qE '^tests/emulator/(record_gif\.mjs|harness\.html)$'; then
    recorder_or_harness_changed=1
fi

check_gif() {
    name=$1
    args=$2  # extra args to record_gif.mjs (e.g. "4" for warmup)
    if [ ! -d tests/emulator/node_modules ]; then
        echo "  (skipping $name gif freshness check — tests/emulator/node_modules not installed)"
        return 0
    fi
    echo "  Rebuilding docs/$name.gif..."
    # shellcheck disable=SC2086
    (cd tests/emulator && node record_gif.mjs "$name" 360 2 /tmp/${name}-precheck.gif $args >/dev/null)
    if ! cmp -s "docs/$name.gif" "/tmp/${name}-precheck.gif"; then
        echo "    STALE: docs/$name.gif"
        echo "           rerun: node tests/emulator/record_gif.mjs $name 360 2 docs/$name.gif $args"
        rm -f "/tmp/${name}-precheck.gif"
        return 1
    fi
    rm -f "/tmp/${name}-precheck.gif"
    return 0
}

if [ $recorder_or_harness_changed -eq 1 ] || \
   echo "$changed_files" | grep -qE '^examples/platformer\.(ne|nes)$'; then
    check_gif platformer "" || exit 1
fi

if [ $recorder_or_harness_changed -eq 1 ] || \
   echo "$changed_files" | grep -qE '^examples/war(\.(ne|nes)|/[^/]+\.ne)$'; then
    check_gif war 4 || exit 1
fi

if [ $recorder_or_harness_changed -eq 1 ] || \
   echo "$changed_files" | grep -qE '^examples/pong(\.(ne|nes)|/[^/]+\.ne)$'; then
    check_gif pong 4 || exit 1
fi

echo "All pre-commit checks passed."
