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

AGENT_NAME=${1:-${MOSAIC_AGENT_NAME:-}}
MOSAIC_TMUX_SOCKET=${MOSAIC_TMUX_SOCKET:-mosaic-factory}
MOSAIC_AGENT_RUNTIME=${MOSAIC_AGENT_RUNTIME:-pi}
MOSAIC_AGENT_WORKDIR=${MOSAIC_AGENT_WORKDIR:-$HOME}
MOSAIC_AGENT_COMMAND=${MOSAIC_AGENT_COMMAND:-}

if [ -z "$AGENT_NAME" ]; then
  echo "ERROR: agent name argument or MOSAIC_AGENT_NAME is required" >&2
  exit 64
fi

if ! command -v tmux >/dev/null 2>&1; then
  echo "ERROR: tmux is required" >&2
  exit 69
fi

if tmux -L "$MOSAIC_TMUX_SOCKET" has-session -t "=${AGENT_NAME}:0.0" 2>/dev/null; then
  echo "Mosaic agent session already running: $AGENT_NAME on socket $MOSAIC_TMUX_SOCKET"
  exit 0
fi

if [ -z "$MOSAIC_AGENT_COMMAND" ]; then
  MOSAIC_AGENT_COMMAND="mosaic yolo $MOSAIC_AGENT_RUNTIME"
fi

mkdir -p "$MOSAIC_AGENT_WORKDIR"
exec tmux -L "$MOSAIC_TMUX_SOCKET" new-session -d -s "$AGENT_NAME" -c "$MOSAIC_AGENT_WORKDIR" "$MOSAIC_AGENT_COMMAND"