#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR=$(cd -- "$(dirname -- "$0")" && pwd)
SEND_MESSAGE="$SCRIPT_DIR/send-message.sh"
AGENT_SEND="$SCRIPT_DIR/agent-send.sh"
SOCKET="mosaic-test-$RANDOM-$$"
TARGET="target-$RANDOM"
DEFAULT_TARGET="default-target-$RANDOM"
TMPDIR=$(mktemp -d)
trap 'tmux -L "$SOCKET" kill-server >/dev/null 2>&1 || true; tmux kill-session -t "$DEFAULT_TARGET" >/dev/null 2>&1 || true; rm -rf "$TMPDIR"' EXIT

fail() {
  echo "FAIL: $*" >&2
  exit 1
}

require_tmux() {
  command -v tmux >/dev/null 2>&1 || fail "tmux is required"
}

capture_named() {
  tmux -L "$SOCKET" capture-pane -t "=$TARGET:0.0" -p
}

capture_default() {
  tmux capture-pane -t "=$DEFAULT_TARGET:0.0" -p
}

require_tmux

tmux -L "$SOCKET" new-session -d -s "$TARGET" -c "$TMPDIR" 'bash --noprofile --norc -i'
tmux new-session -d -s "$DEFAULT_TARGET" -c "$TMPDIR" 'bash --noprofile --norc -i'

"$SEND_MESSAGE" -L "$SOCKET" -t "=$TARGET" -m "named socket hello" >/tmp/send-message-named.out
sleep 0.2
capture_named | grep -qF "named socket hello" || fail "send-message.sh did not deliver to named socket"
if capture_default | grep -qF "named socket hello"; then
  fail "send-message.sh leaked named-socket message to default tmux server"
fi

"$AGENT_SEND" -L "$SOCKET" -S "tester:source" -s "=$TARGET" -m "agent socket hello" >/tmp/agent-send-named.out
sleep 0.2
capture_named | grep -qF "[tester:source ->" || fail "agent-send.sh did not include preamble"
capture_named | grep -qF "agent socket hello" || fail "agent-send.sh did not deliver to named socket"
if capture_default | grep -qF "agent socket hello"; then
  fail "agent-send.sh leaked named-socket message to default tmux server"
fi

# Concurrency: parallel senders on one server must not cross-deliver or drop.
# Locks the unique-per-invocation paste buffer (a fixed buffer name raced:
# load overwrote load, -d deleted underneath — messages swapped between panes).
CONC_N=5
for i in $(seq 1 "$CONC_N"); do
  tmux -L "$SOCKET" new-session -d -s "conc-$i" -c "$TMPDIR" 'bash --noprofile --norc -i'
done
pids=()
for i in $(seq 1 "$CONC_N"); do
  "$SEND_MESSAGE" -L "$SOCKET" -t "=conc-$i" -m "CONCPAYLOAD-${i}-END" >/dev/null &
  pids+=($!)
done
for pid in "${pids[@]}"; do
  wait "$pid" || fail "concurrent send-message.sh invocation exited non-zero"
done
sleep 0.2
for i in $(seq 1 "$CONC_N"); do
  pane=$(tmux -L "$SOCKET" capture-pane -t "=conc-$i:0.0" -p)
  printf '%s' "$pane" | grep -qF "CONCPAYLOAD-${i}-END" \
    || fail "concurrent send dropped payload for pane conc-$i"
  for j in $(seq 1 "$CONC_N"); do
    [ "$j" = "$i" ] && continue
    if printf '%s' "$pane" | grep -qF "CONCPAYLOAD-${j}-END"; then
      fail "concurrent send cross-delivered payload $j to pane conc-$i"
    fi
  done
done

echo "ok - named tmux socket send tools"