#!/usr/bin/env bash
# 用法：watch-issue.sh <owner/repo> <N>（在 clone 裡以背景執行）
# 每 HERDR_ISSUE_WATCH_INTERVAL 秒（預設 5）查議題；agent blocked 超過 HERDR_ISSUE_BLOCKED_AFTER 秒（預設 60，只通知一次）或消失就彈 Herdr 通知；議題關閉時清理並往上檢查規格、總覽。
source "$(dirname "$0")/lib.sh"
REPO="${1:?}"; N="${2:?用法：watch-issue.sh <owner/repo> <N>}"
CLONE="$(clone_root_for "$REPO")"
BRANCH="issue-$N"
WT="$(worktree_path "$N" "$CLONE")"
LAST=""
WATCH_INTERVAL="${HERDR_ISSUE_WATCH_INTERVAL:-5}"    # 輪詢秒數（不耗額度，只查 Gitea 與 Herdr）
BLOCKED_AFTER="${HERDR_ISSUE_BLOCKED_AFTER:-60}"     # blocked 連續超過幾秒才通知
BLOCKED_SINCE=0
NOTIFIED=false

# 若 <label> 底下沒有 open 議題，留言並關閉議題 X；印出 closed|open|skip
close_if_done() { # $1=X $2=label
  [ "$(issue_state "$REPO" "$1")" = open ] || { echo skip; return; }
  if [ "$(open_count_with_label "$REPO" "$2")" = 0 ]; then
    tea comment "$1" --repo "$REPO" "底下的議題全部關閉，由 gitea 自動關閉。" >/dev/null
    tea issues close "$1" --repo "$REPO" >/dev/null
    echo closed
  else
    echo open
  fi
}

while [ "$(issue_state "$REPO" "$N")" != closed ]; do # 查詢失敗會回空字串，要繼續等，不能當成已關閉
  S="$(agent_status "$N")"
  NOW="$(date +%s)"
  if [ "$S" = blocked ]; then
    [ "$LAST" = blocked ] || { BLOCKED_SINCE=$NOW; NOTIFIED=false; }
    if ! $NOTIFIED && [ $((NOW - BLOCKED_SINCE)) -ge "$BLOCKED_AFTER" ]; then
      notify "#$N 等你回答" "issue-$N 已 blocked 超過 $BLOCKED_AFTER 秒"
      NOTIFIED=true
    fi
  elif [ "$S" = missing ] && [ "$LAST" != missing ] && [ -n "$LAST" ]; then
    notify "#$N 的 agent 不見了" "issue-$N 的 agent 已結束，議題仍 open"
  fi
  LAST="$S"
  sleep "$WATCH_INTERVAL"
done

echo "#$N 已關閉，開始清理"
LABELS="$(issue_labels "$REPO" "$N")"
TAB="$(tab_for_issue "$N")"
[ -n "$TAB" ] && herdr tab close "$TAB" >/dev/null && echo "關閉 tab $TAB"
tea issues edit "$N" --repo "$REPO" --remove-labels "$LABEL" >/dev/null 2>&1 || true

git -C "$CLONE" fetch --quiet origin || true
read -r PR STATE _ <<<"$(pr_for_issue "$REPO" "$N")" || true
DELETE_BRANCH=false
case "${STATE:-none}" in
  merged) DELETE_BRANCH=true; echo "PR #$PR 已合併" ;;
  closed|open) echo "PR #$PR 狀態 $STATE，保留分支" ;;
  *) if [ "$(git -C "$CLONE" rev-list --count "origin/main..$BRANCH" 2>/dev/null || echo 0)" = 0 ]; then DELETE_BRANCH=true; echo "沒有 PR 也沒有 commit"; else echo "沒有 PR 但分支有 commit，保留"; fi ;;
esac
if git -C "$CLONE" worktree list --porcelain | grep -qx "worktree $WT"; then
  git -C "$CLONE" worktree remove --force "$WT" && echo "移除 worktree $WT"
fi
$DELETE_BRANCH && git -C "$CLONE" branch -D "$BRANCH" >/dev/null 2>&1 && echo "刪除分支 $BRANCH"

SPEC="$(grep -o '規格/#[0-9]*' <<<"$LABELS" | head -1 | tr -d '規格/#')"
if [ -n "$SPEC" ]; then
  R="$(close_if_done "$SPEC" "規格/#$SPEC")"; echo "規格 #$SPEC：$R"
  if [ "$R" = closed ]; then
    OV="$(issue_labels "$REPO" "$SPEC" | grep -o '總覽/#[0-9]*' | head -1 | tr -d '總覽/#')"
    [ -n "$OV" ] && echo "總覽 #$OV：$(close_if_done "$OV" "總覽/#$OV")"
  fi
fi
echo "#$N 清理完成"