#!/usr/bin/env bash
# Test: all cached files remain readable while fully offline
#
# Creates 3 test files (100 KB each) on the NAS, reads them through the
# FUSE mount to warm the cache, severs the network, and reads all three
# again.  Every read should succeed from the local VFS cache and the
# content should match the originals.
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
source "$SCRIPT_DIR/../harness/helpers.sh"
source "$SCRIPT_DIR/../harness/mock-nas.sh"

require_root
setup_test_env
trap teardown_test_env EXIT

# --- Arrange ---
start_mock_nas
nas_create_file "alpha.dat" 100
nas_create_file "bravo.dat" 100
nas_create_file "charlie.dat" 100

# Record NAS-side checksums
cksum_alpha=$(nas_file_checksum "alpha.dat")
cksum_bravo=$(nas_file_checksum "bravo.dat")
cksum_charlie=$(nas_file_checksum "charlie.dat")

gen_config

start_warpgate
wait_for_mount
wait_for_rc_api

# --- Warm the cache by reading each file ---
cat "$TEST_MOUNT/alpha.dat"   > /dev/null
cat "$TEST_MOUNT/bravo.dat"   > /dev/null
cat "$TEST_MOUNT/charlie.dat" > /dev/null

assert_cached "alpha.dat"
assert_cached "bravo.dat"
assert_cached "charlie.dat"

# --- Act: go offline ---
inject_network_down

# Read all three files again from cache
actual_alpha=$(md5sum "$TEST_MOUNT/alpha.dat"   | awk '{print $1}')
actual_bravo=$(md5sum "$TEST_MOUNT/bravo.dat"   | awk '{print $1}')
actual_charlie=$(md5sum "$TEST_MOUNT/charlie.dat" | awk '{print $1}')

# --- Assert ---
fail=0

if [[ "$actual_alpha" != "$cksum_alpha" ]]; then
    echo "FAIL: alpha.dat checksum mismatch offline" >&2
    fail=1
fi
if [[ "$actual_bravo" != "$cksum_bravo" ]]; then
    echo "FAIL: bravo.dat checksum mismatch offline" >&2
    fail=1
fi
if [[ "$actual_charlie" != "$cksum_charlie" ]]; then
    echo "FAIL: charlie.dat checksum mismatch offline" >&2
    fail=1
fi

# Restore network for clean teardown
inject_network_up

if [[ "$fail" -ne 0 ]]; then
    exit 1
fi

echo "PASS: $(basename "$0" .sh)"