#!/bin/sh
# Run one bounded Go fuzz target in the pinned RVBox toolchain container.
set -eu

repo_root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)

usage() {
    cat <<'EOF'
usage: scripts/test-fuzz --package ./PACKAGE --name FUZZ_TEST [--time DURATION]

Runs exactly one Fuzz* target with ordinary unit tests disabled. The default
duration is 30s. A crash leaves Go's minimal reproducer in the package fuzz
corpus, where it becomes a normal deterministic seed on the next test run.
EOF
}

fail() { printf '%s\n' "test-fuzz: $*" >&2; exit 2; }

package=
name=
duration=30s
while [ "$#" -gt 0 ]; do
    case $1 in
        --package) [ "$#" -ge 2 ] || fail "--package needs a value"; package=$2; shift 2 ;;
        --name) [ "$#" -ge 2 ] || fail "--name needs a value"; name=$2; shift 2 ;;
        --time) [ "$#" -ge 2 ] || fail "--time needs a value"; duration=$2; shift 2 ;;
        --help|-h) usage; exit 0 ;;
        *) fail "unknown argument $1" ;;
    esac
done

case $package in ./*) ;; *) fail "--package must be a repository-relative Go package" ;; esac
case $name in Fuzz*) ;; *) fail "--name must be a Fuzz* test function" ;; esac
case $name in *[!A-Za-z0-9_]* ) fail "--name contains unsupported characters" ;; esac
case $duration in *[!0-9a-zA-Z.]*) fail "--time contains unsupported characters" ;; esac

cd "$repo_root"
exec docker compose -f deploy/compose.yaml run --rm toolchain \
    go test "$package" -run '^$' -fuzz "$name" -fuzztime "$duration"