#!/usr/bin/env bash
# Show recent file changes from other PSM sessions

source "${HOME}/.wtm/lib/common.sh"

if [[ $# -lt 1 ]]; then
  echo "Usage: wtm changes <session-id> [--clear]"
  exit 1
fi

SESSION_ID="$1"
CLEAR="${2:-}"

SESSION_DATA=$(get_session "${SESSION_ID}") || {
  log_error "Session '${SESSION_ID}' not found"
  exit 1
}

WORKTREE=$(echo "${SESSION_DATA}" | python3 -c "import json,sys; print(json.loads(sys.stdin.read()).get('worktree',''))")
NOTIFY_FILE="${WORKTREE}/.wtm-notifications/pending.log"

if [[ ! -f "${NOTIFY_FILE}" ]] || [[ ! -s "${NOTIFY_FILE}" ]]; then
  log_ok "No pending notifications from other sessions."
  exit 0
fi

echo ""
echo "  Recent changes from other sessions:"
echo "  ─────────────────────────────────────────────"

python3 -c "
import sys
from collections import defaultdict

changes = defaultdict(list)
with open('${NOTIFY_FILE}') as f:
    for line in f:
        parts = line.strip().split('|', 2)
        if len(parts) == 3:
            ts, session, file = parts
            changes[session].append((ts, file))

for session, files in changes.items():
    print(f'  Session: {session}')
    # Show last 10 changes per session
    for ts, f in files[-10:]:
        print(f'    {ts[:16]}  {f}')
    if len(files) > 10:
        print(f'    ... and {len(files) - 10} more')
    print()
"

# Conflict detection: check if this session's branch has diverged from base
BASE_BRANCH=$(echo "${SESSION_DATA}" | python3 -c "import json,sys; print(json.loads(sys.stdin.read()).get('base_branch','main'))")
if [[ -n "${WORKTREE}" ]] && [[ -d "${WORKTREE}" ]]; then
  echo ""
  echo "  Branch conflict check:"
  echo "  ─────────────────────────────────────────────"
  CONFLICT_STATUS=$(detect_branch_conflicts "${WORKTREE}" "${BASE_BRANCH}" 2>/dev/null | head -1)
  if [[ -n "${CONFLICT_STATUS}" ]]; then
    CONFLICT_DETAIL=$(detect_branch_conflicts "${WORKTREE}" "${BASE_BRANCH}" 2>/dev/null | tail -1)
    if [[ "${CONFLICT_STATUS}" == "UP_TO_DATE" ]]; then
      log_ok "  Branch is up to date with origin/${BASE_BRANCH}."
    else
      log_warn "  ${CONFLICT_STATUS}"
      if [[ -n "${CONFLICT_DETAIL}" ]] && [[ "${CONFLICT_DETAIL}" != "${CONFLICT_STATUS}" ]]; then
        if [[ "${CONFLICT_DETAIL}" == CONFLICTS* ]]; then
          log_error "  ${CONFLICT_DETAIL}"
        else
          log_ok "  ${CONFLICT_DETAIL}"
        fi
      fi
      suggest_conflict_resolution "${CONFLICT_STATUS}"
    fi
  fi
  echo ""
fi

if [[ "${CLEAR}" == "--clear" ]]; then
  > "${NOTIFY_FILE}"
  log_ok "Notifications cleared."
fi