#!/usr/bin/env bash
# create_session.sh — multi-agent-mux-create 의 부속 스크립트
# Usage:
#   bash create_session.sh --workspace <path> --agent <claude|agy> [--session <name>] [--wrapper]
#
# 동작:
#   1) preflight: tmux/claude/agy 가용성, workspace 존재
#   2) tmux 세션 이름 결정 (--session 없으면 자동)
#   3) tmux 세션 시작 (claude 는 wrapper 우선, agy 는 인라인)
#   4) pane 메타 캡처 (pid, cmd, cwd)
#   5) agent-sessions.yaml 에 tmux_sessions[] 엔트리 append
#   6) 검증 출력
#
# Exit codes:
#   0  = success
#   1  = preflight failure
#   2  = invalid args
#   3  = tmux session already exists (use multi-agent-mux-resume or delete first)
#   4  = agent-sessions.yaml append failure
set -euo pipefail

source "$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)/lib.sh"

usage() {
  cat <<EOF
Usage: $0 --workspace <path> --agent <claude|agy|hermes> [options]

Options:
  --workspace PATH    project directory (required)
  --agent AGENT       claude | agy | hermes (required)
  --session NAME      tmux session name (default: derived from workspace)
  --wrapper           force use of ~/.local/bin/<session> wrapper even if not present
  --dry-run           print commands without executing
  --tmux-server NAME  specify isolated tmux server name
  --submit-job PROMPT submit a job to multi-agent-mux-delegate-job registry with the given prompt
  -h, --help          this help
EOF
}

WORKSPACE=""
AGENT=""
SESSION_NAME=""
USE_WRAPPER=0
DRY_RUN=0
TMUX_SERVER_OPT=""
SUBMIT_JOB_PROMPT=""

while [ $# -gt 0 ]; do
  case "$1" in
    --workspace) WORKSPACE="$2"; shift 2 ;;
    --agent)     AGENT="$2";     shift 2 ;;
    --session)   SESSION_NAME="$2"; shift 2 ;;
    --wrapper)   USE_WRAPPER=1; shift ;;
    --dry-run)   DRY_RUN=1; shift ;;
    --tmux-server) TMUX_SERVER_OPT="$2"; shift 2 ;;
    --submit-job) SUBMIT_JOB_PROMPT="$2"; shift 2 ;;
    -h|--help)   usage; exit 0 ;;
    *) echo "ERROR: unknown arg: $1" >&2; usage; exit 2 ;;
  esac
done

if [ -n "$TMUX_SERVER_OPT" ]; then
  export TMUX_SERVER_NAME="$TMUX_SERVER_OPT"
fi

# Preflight
[ -n "$WORKSPACE" ] || { echo "ERROR: --workspace required" >&2; usage; exit 2; }
[ -n "$AGENT" ]    || { echo "ERROR: --agent required" >&2; usage; exit 2; }
[ -d "$WORKSPACE" ] || { echo "ERROR: workspace $WORKSPACE not a directory" >&2; exit 1; }
command -v tmux >/dev/null || { echo "ERROR: tmux not installed" >&2; exit 1; }
command -v "$AGENT" >/dev/null || { echo "ERROR: $AGENT CLI not in PATH" >&2; exit 1; }

# Auth Check (OAuth check for agy, loggedIn check for claude, status for hermes)
if [ "$AGENT" = "claude" ]; then
  if ! claude auth status 2>/dev/null | grep -q '"loggedIn":\s*true'; then
    echo "ERROR: claude not logged in. Run 'claude auth login' first." >&2
    exit 1
  fi
elif [ "$AGENT" = "agy" ]; then
  if ! agy models >/dev/null 2>&1; then
    echo "ERROR: agy is not authenticated. Please log in first." >&2
    exit 1
  fi
elif [ "$AGENT" = "hermes" ]; then
  if ! hermes status >/dev/null 2>&1; then
    echo "ERROR: hermes is not functional. Run 'hermes setup' first." >&2
    exit 1
  fi
fi

# 세션 이름 — lib.sh::derive_session_name 이 단일 소스 (P0-A)
if [ -z "$SESSION_NAME" ]; then
  SESSION_NAME="$(derive_session_name "$WORKSPACE" "$AGENT")"
fi

# 이미 살아있으면 실패
if _tmux has-session -t "$SESSION_NAME" 2>/dev/null; then
  echo "ERROR: tmux session '$SESSION_NAME' already exists. Use multi-agent-mux-resume to attach, or multi-agent-mux-stop first." >&2
  exit 3
fi

# tmux 세션 띄우기
LOCAL_BIN="${LOCAL_BIN:-$HOME/.local/bin}"
WRAPPER="$LOCAL_BIN/$SESSION_NAME"

spawn() {
  case "$AGENT" in
    claude)
      if [ -x "$WRAPPER" ] || [ "$USE_WRAPPER" = "1" ]; then
        nohup "$WRAPPER" >/dev/null 2>&1 &
        disown
      else
        _tmux new-session -d -s "$SESSION_NAME" -x 140 -y 40 -c "$WORKSPACE" "claude --dangerously-skip-permissions"
      fi
      ;;
    agy)
      _tmux new-session -d -s "$SESSION_NAME" -x 140 -y 40 -c "$WORKSPACE" "agy --dangerously-skip-permissions"
      ;;
    hermes)
      _tmux new-session -d -s "$SESSION_NAME" -x 140 -y 40 -c "$WORKSPACE" "hermes"
      ;;
    *) echo "ERROR: --agent must be claude, agy or hermes, got: $AGENT" >&2; exit 2 ;;
  esac
}

if [ "$DRY_RUN" = "1" ]; then
  echo "[dry-run] would spawn: tmux session '$SESSION_NAME' in $WORKSPACE (agent=$AGENT)"
  exit 0
fi

spawn

# TUI 준비 대기
sleep 6

# pane 메타 캡처
PANE_PID=$(_tmux list-panes -t "$SESSION_NAME" -F '#{pane_pid}' 2>/dev/null || echo "")
PANE_CWD=$(_tmux list-panes -t "$SESSION_NAME" -F '#{pane_current_path}' 2>/dev/null || echo "$WORKSPACE")
PANE_CMD=$(_tmux list-panes -t "$SESSION_NAME" -F '#{pane_current_command}' 2>/dev/null || echo "$AGENT")
TMUX_EPOCH=$(date +%s)
NOW_ISO=$(date -u +'%Y-%m-%dT%H:%M:%SZ')

# cmd_full 결정
case "$AGENT" in
  claude) CMD_FULL='claude --dangerously-skip-permissions' ;;
  agy)    CMD_FULL='agy --dangerously-skip-permissions' ;;
  hermes) CMD_FULL='hermes' ;;
esac

# 시작 명령
local_tmux="tmux"
if [ -n "${TMUX_SERVER_NAME:-}" ] && [ "$TMUX_SERVER_NAME" != "default" ]; then
  local_tmux="tmux -L $TMUX_SERVER_NAME"
fi

case "$AGENT" in
  claude)
    if [ -x "$WRAPPER" ]; then
      START_CMD="$WRAPPER   # ~/.local/bin 의 래퍼"
    else
      START_CMD="$local_tmux new-session -d -s \"$SESSION_NAME\" -x 140 -y 40 -c \"$WORKSPACE\" \"claude --dangerously-skip-permissions\""
    fi
    ;;
  agy|hermes)
    START_CMD="$local_tmux new-session -d -s \"$SESSION_NAME\" -x 140 -y 40 -c \"$WORKSPACE\" \"$CMD_FULL\""
    ;;
esac

# agent-sessions.yaml 에 append
DELEGATE_JOB_ID=""
if [ -n "$SUBMIT_JOB_PROMPT" ]; then
  delegate_agent=""
  if [ "$AGENT" = "claude" ]; then
    delegate_agent="claude-code"
  elif [ "$AGENT" = "hermes" ]; then
    delegate_agent="hermes-agent"
  else
    delegate_agent="antigravity-cli"
  fi
  agent_session="tmux:$SESSION_NAME"
  DELEGATE_JOB_ID=$(delegate_submit_job "$SUBMIT_JOB_PROMPT" "$delegate_agent" "$agent_session")
  echo "Submitted delegated job: $DELEGATE_JOB_ID"
fi

if [ ! -f "$AGENT_SESSIONS_YAML" ]; then
  mkdir -p "$(dirname "$AGENT_SESSIONS_YAML")"
  echo "tmux_sessions: []" > "$AGENT_SESSIONS_YAML"
fi

# atomic_dump_yaml: flock + temp+rename + .bak + schema validate (P0-B).
# 모든 값은 환경변수로 전달 — heredoc interpolation 없음 (P1-B).
# 자식 pid 는 bash 에서 pgrep 으로 미리 구함 (P2: 도구명 필터).
CHILD_PID=0
if { [ "$AGENT" = "agy" ] || [ "$AGENT" = "hermes" ]; } && [ -n "$PANE_PID" ]; then
  CHILD_PID=$(pgrep -P "$PANE_PID" -x "$AGENT" 2>/dev/null | head -1 || true)
  CHILD_PID="${CHILD_PID:-0}"
fi

atomic_dump_yaml "$AGENT_SESSIONS_YAML" \
  SESSION_NAME="$SESSION_NAME" AGENT="$AGENT" NOW_ISO="$NOW_ISO" \
  TMUX_EPOCH="$TMUX_EPOCH" PANE_PID="$PANE_PID" PANE_CWD="$PANE_CWD" \
  CMD_FULL="$CMD_FULL" START_CMD="$START_CMD" CHILD_PID="$CHILD_PID" \
  TMUX_SERVER_NAME="${TMUX_SERVER_NAME:-default}" \
  DELEGATE_JOB_ID="$DELEGATE_JOB_ID" <<'PYEOF'
name = os.environ['SESSION_NAME']
agent = os.environ['AGENT']
pid = os.environ.get('PANE_PID', '')
epoch = os.environ.get('TMUX_EPOCH', '')
server_name = os.environ.get('TMUX_SERVER_NAME', 'default')
server_opt = f"-L {server_name} " if server_name and server_name != 'default' else ""

sessions = d.setdefault('tmux_sessions', [])

# P0-D: 같은 이름 엔트리가 status=running 이면만 거부. terminated/archived 는
# 재사용 가능 — 낡은 엔트리를 제거하고 새로 append (create -> delete -> create).
running_same = [s for s in sessions if s.get('name') == name and s.get('status') == 'running']
if running_same:
    print(f"ERROR: {name} already running in agent-sessions.yaml", flush=True)
    raise SystemExit(4)
sessions[:] = [s for s in sessions if s.get('name') != name]

entry = {
    'name': name,
    'status': 'running',
    'tmux_session_created_at': os.environ['NOW_ISO'],
    'tmux_session_epoch': int(epoch) if epoch.isdigit() else 0,
    'tmux_server': server_name,
    'delegate_job_id': os.environ.get('DELEGATE_JOB_ID', '') or None,
    'pane': {
        'index': 0,
        'pid': int(pid) if pid.isdigit() else 0,
        'cmd': agent,
        'cmd_full': os.environ['CMD_FULL'],
        'cwd': os.environ['PANE_CWD'],
    },
    'start_command': os.environ['START_CMD'],
    'attach_command': f'tmux {server_opt}attach -t {name}',
    'kill_command': f'tmux {server_opt}kill-session -t {name}',
}

if agent == 'claude':
    entry['tui'] = {
        'model': '(unknown — capture after first message)',
        'provider': 'anthropic',
        'plan': '(unknown)',
        'account': '(unknown — read from claude auth status)',
        'version': '(unknown — read from TUI)',
    }
    entry['claude_session_id_own'] = None
    entry['last_visible_status'] = "TUI started; awaiting first user message"
elif agent == 'agy':
    cp = os.environ.get('CHILD_PID', '0')
    entry['child_pid'] = int(cp) if cp.isdigit() else 0
    entry['agy_conversation_id_own'] = None
    entry['mcp_attachments'] = [
        {
            'name': 'stitch',
            'transport': 'mcp-remote',
            'endpoint': 'https://stitch.googleapis.com/mcp'
        }
    ]
    entry['last_visible_status'] = "TUI started; awaiting first user message"
elif agent == 'hermes':
    cp = os.environ.get('CHILD_PID', '0')
    entry['child_pid'] = int(cp) if cp.isdigit() else 0
    entry['hermes_conversation_id_own'] = None
    entry['last_visible_status'] = "TUI started; awaiting first user message"

sessions.append(entry)

snap = d.setdefault('snapshot', {})
snap['taken_at'] = os.environ['NOW_ISO']
snap['cwd'] = os.environ['PANE_CWD']
print(f"appended: {name}", flush=True)
PYEOF

echo
echo "=== created ==="
echo "tmux session: $SESSION_NAME (pane pid $PANE_PID, cmd $PANE_CMD, cwd $PANE_CWD)"
if [ -n "$DELEGATE_JOB_ID" ]; then
  echo "delegate job: $DELEGATE_JOB_ID"
  delegate_publish_event "$DELEGATE_JOB_ID" started "multi-agent-mux session created"
  WD_PID=$(start_watchdog "$DELEGATE_JOB_ID" "$WORKSPACE")
  echo "watchdog PID: $WD_PID"
fi
echo "agent-sessions.yaml updated"
echo
if [ -n "${TMUX_SERVER_NAME:-}" ] && [ "$TMUX_SERVER_NAME" != "default" ]; then
  echo "Attach:  tmux -L $TMUX_SERVER_NAME attach -t $SESSION_NAME"
else
  echo "Attach:  tmux attach -t $SESSION_NAME"
fi
echo "Delete:  use multi-agent-mux-stop skill"
echo "Resume:  use multi-agent-mux-resume skill (after first message creates a session id)"