#!/usr/bin/env bash
# Target normalisation: send-message.sh must address an EXACT session and the
# session's ACTIVE window. Both halves have caused silent wrong-pane delivery:
#   * an unpinned name prefix-matches, so a message for an absent session is
#     delivered to a different agent and reported OK;
#   * a `:0.0` pin addresses window 0 regardless of where the agent is, and
#     because the paste, the Enter and the verifying capture share one target,
#     the wrong window is also the window that confirms the send.
# Both rows below FAIL against the pre-fix script, which is the point of them.
set -euo pipefail

SCRIPT_DIR=$(cd -- "$(dirname -- "$0")" && pwd)
SEND_MESSAGE="$SCRIPT_DIR/send-message.sh"
SOCKET="mosaic-test-target-$RANDOM-$$"
TMPDIR=$(mktemp -d)
trap 'tmux -L "$SOCKET" kill-server >/dev/null 2>&1 || true; rm -rf "$TMPDIR"' EXIT

fail() { echo "FAIL: $*" >&2; exit 1; }
command -v tmux >/dev/null 2>&1 || fail "tmux is required"

tmux_() { tmux -L "$SOCKET" "$@"; }
newsess() { tmux_ new-session -d -s "$1" -c "$TMPDIR" 'PS1="❯ " exec bash --noprofile --norc -i'; }
hits() { tmux_ capture-pane -p -t "$1" 2>/dev/null | grep -cF "$2" || true; }

# ── 1. an absent session must not prefix-match a live one ───────────────────
newsess sibling-long
nonce="absent-target-$RANDOM"
rc=0; "$SEND_MESSAGE" -L "$SOCKET" -t sibling -m "$nonce" >/dev/null 2>&1 || rc=$?
[ "$rc" -ne 0 ] || fail "send to absent session 'sibling' returned rc=0 (prefix-matched)"
[ "$(hits sibling-long "$nonce")" -eq 0 ] || fail "message for absent 'sibling' was delivered to 'sibling-long'"

# positive control: the detector above can see a real delivery
nonce_ok="control-$RANDOM"
"$SEND_MESSAGE" -L "$SOCKET" -t sibling-long -m "$nonce_ok" >/dev/null 2>&1 \
  || fail "send to a live session failed"
[ "$(hits sibling-long "$nonce_ok")" -gt 0 ] || fail "control: live delivery not observed — detector is blind"

# ── 2. delivery follows the ACTIVE window, not window 0 ─────────────────────
# A single-window fixture cannot tell `=s:` from `=s:0.0`; the active window
# must be non-zero or this test proves nothing.
newsess multi
tmux_ new-window -t multi -c "$TMPDIR" 'PS1="❯ " exec bash --noprofile --norc -i'
tmux_ select-window -t multi:1
active=$(tmux_ display-message -p -t multi '#{window_index}')
[ "$active" = "1" ] || fail "fixture setup: expected active window 1, got $active"

for target in multi "=multi"; do
  nonce="active-win-$RANDOM"
  "$SEND_MESSAGE" -L "$SOCKET" -t "$target" -m "$nonce" >/dev/null 2>&1 \
    || fail "send to '$target' failed"
  [ "$(hits multi:1 "$nonce")" -gt 0 ] || fail "'$target' did not deliver to the active window"
  [ "$(hits multi:0 "$nonce")" -eq 0 ] || fail "'$target' delivered to window 0 instead of the active window"
done

# ── 3. an explicit window part is preserved ─────────────────────────────────
nonce="explicit-win-$RANDOM"
"$SEND_MESSAGE" -L "$SOCKET" -t multi:0 -m "$nonce" >/dev/null 2>&1 || fail "send to 'multi:0' failed"
[ "$(hits multi:0 "$nonce")" -gt 0 ] || fail "explicit 'multi:0' did not deliver to window 0"

# ── 4. a unique prefix of a live session is still refused ───────────────────
nonce="prefix-$RANDOM"
rc=0; "$SEND_MESSAGE" -L "$SOCKET" -t mult -m "$nonce" >/dev/null 2>&1 || rc=$?
[ "$rc" -ne 0 ] || fail "send to prefix 'mult' returned rc=0"
[ "$(hits multi:1 "$nonce")" -eq 0 ] || fail "prefix 'mult' was delivered to 'multi'"

echo "PASS: send-message.sh target normalisation"