#!/usr/bin/env bash
# 用法：pr-wait.sh <owner/repo> <N>
# 阻塞到 head 為 issue-N 的 PR 有衝突、被關閉或合併，或議題被關閉。
# 最後一行印出原因：conflict | closed | merged | issue-closed
source "$(dirname "$0")/lib.sh"
REPO="${1:?}"; N="${2:?用法：pr-wait.sh <owner/repo> <N>}"
while :; do
  read -r PR STATE MERGEABLE <<<"$(pr_for_issue "$REPO" "$N")" || true
  if [ -z "${PR:-}" ]; then
    echo "還沒有 head 為 issue-$N 的 PR，$INTERVAL 秒後再查"
  else
    case "$STATE" in
      merged) echo "PR #$PR 已合併"; echo merged; exit 0 ;;
      closed) echo "PR #$PR 被關閉（未合併）"; echo closed; exit 0 ;;
      open)
        if [ "$MERGEABLE" = "false" ]; then
          sleep 60
          read -r _ _ AGAIN <<<"$(pr_for_issue "$REPO" "$N")"
          if [ "$AGAIN" = "false" ]; then echo "PR #$PR 與 main 有衝突"; echo conflict; exit 0; fi
        fi ;;
    esac
  fi
  if [ "$(issue_state "$REPO" "$N")" = "closed" ]; then echo "議題 #$N 已關閉"; echo issue-closed; exit 0; fi
  sleep "$INTERVAL"
done