#!/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: concurrent writes are all written back correctly.
# 10 files written in parallel background subshells should all drain
# and arrive on the NAS with correct content.

require_root
setup_test_env
trap teardown_test_env EXIT

start_mock_nas

gen_config write_back=2s transfers=4

start_warpgate
wait_for_mount
wait_for_rc_api

# Write 10 files concurrently in background subshells
pids=()
for i in $(seq 1 10); do
    (echo "concurrent-data-$i" > "$TEST_MOUNT/concurrent-$i.txt") &
    pids+=($!)
done

# Wait for all write subshells to complete
for pid in "${pids[@]}"; do
    wait "$pid"
done

# Wait for all dirty files to drain
wait_for_dirty_zero 60

# Verify all 10 files arrived on the NAS with correct content
for i in $(seq 1 10); do
    assert_file_content "$NAS_ROOT/concurrent-$i.txt" "concurrent-data-$i"
done

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