#!/usr/bin/env bash
#
# Size gate: fail if the stripped release daemon exceeds the section 5 budget.
#
# Usage: size-check.sh [binary-path] [max-bytes]
#
# Kept separate from ci.sh so the Gitea workflow can run it as its own step
# against an artifact it has already built, rather than rebuilding.

source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/lib.sh"

# Default binary path. CARGO_TARGET_DIR may be absolute (the usual case — it
# points outside the repo) or relative, so it must not be blindly joined onto
# REPO_ROOT: doing that turns "/home/sp/.blocker-target/..." into
# "/home/sp/blocker//home/sp/.blocker-target/...".
DEFAULT_TARGET="${CARGO_TARGET_DIR:-${HOME}/.blocker-target}"
if [[ "${DEFAULT_TARGET}" = /* ]]; then
    DEFAULT_BINARY="${DEFAULT_TARGET}/release/blocker-daemon"
else
    DEFAULT_BINARY="${REPO_ROOT}/${DEFAULT_TARGET}/release/blocker-daemon"
fi

BINARY="${1:-${DEFAULT_BINARY}}"
MAX_BYTES="${2:-${MAX_DAEMON_BYTES}}"

# Normalise so the message shows the real path rather than a doubled prefix.
BINARY="$(cd -- "$(dirname -- "${BINARY}")" 2>/dev/null && pwd)/$(basename -- "${BINARY}")" \
    || die "binary not found: ${BINARY}"

SIZE="$(stat -c %s "${BINARY}" 2>/dev/null || stat -f %z "${BINARY}")"

# Human-readable, using 1024-based units to match how the budget is written.
printf 'binary : %s\n' "${BINARY}"
printf 'size   : %s bytes (%d.%03d MB)\n' \
    "${SIZE}" "$((SIZE / 1048576))" "$(((SIZE % 1048576) * 1000 / 1048576))"
printf 'budget : %s bytes (%d MB)\n' "${MAX_BYTES}" "$((MAX_BYTES / 1048576))"

if (( SIZE > MAX_BYTES )); then
    printf '%sOVER BUDGET by %s bytes%s\n' "${C_RED}" "$((SIZE - MAX_BYTES))" "${C_RESET}"
    exit 1
fi

printf '%swithin budget, %s bytes headroom%s\n' \
    "${C_GREEN}" "$((MAX_BYTES - SIZE))" "${C_RESET}"