#!/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    echo "one or more committed ROMs are out of date"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.gif when platformer.nes or the gif
# recorder itself changed — the gif regeneration takes ~20s 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.
changed_files=$(git diff --cached --name-only)
if echo "$changed_files" | grep -qE '^(examples/platformer\.(ne|nes)|tests/emulator/record_gif\.mjs|tests/emulator/harness\.html)$'; then
    if [ -d tests/emulator/node_modules ]; then
        echo "  Rebuilding docs/platformer.gif (platformer.nes or recorder changed)..."
        (cd tests/emulator && node record_gif.mjs platformer 360 2 /tmp/platformer-precheck.gif >/dev/null)
        if ! cmp -s docs/platformer.gif /tmp/platformer-precheck.gif; then
            echo "    STALE: docs/platformer.gif"
            echo "           rerun: node tests/emulator/record_gif.mjs platformer 360 2 docs/platformer.gif"
            rm -f /tmp/platformer-precheck.gif
            exit 1
        fi
        rm -f /tmp/platformer-precheck.gif
    else
        echo "  (skipping gif freshness check — tests/emulator/node_modules not installed)"
    fi
fi

echo "All pre-commit checks passed."
