#!/usr/bin/env bash
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
source "$SCRIPT_DIR/../harness/helpers.sh"
source "$SCRIPT_DIR/../harness/mock-nas.sh"

# Test: write_back=0s causes immediate upload — no dirty files linger.
# With zero write-back delay, rclone should upload files as soon as they
# are closed, so the dirty count should reach 0 quickly.

require_root
setup_test_env
trap teardown_test_env EXIT

start_mock_nas

# Zero write-back delay — files are uploaded immediately
gen_config write_back=0s

start_warpgate
wait_for_mount
wait_for_rc_api

# Write a file through the FUSE mount
echo "instant-wb" > "$TEST_MOUNT/instant.txt"

# Give time for the immediate write-back to complete
sleep 5

# Dirty count should be 0 — the file was already uploaded
dirty=$(get_dirty_count)
if [[ "$dirty" -ne 0 ]]; then
    echo "FAIL: expected dirty count 0 with write_back=0s, got $dirty" >&2
    exit 1
fi

# Verify the file arrived on the NAS with correct content
assert_file_content "$NAS_ROOT/instant.txt" "instant-wb"

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