#!/usr/bin/env bash
# 用法：start.sh <owner/repo> <N>
# 在目前 clone 旁建 worktree、開 Herdr tab、啟動 claude、送提示詞並確認 agent 有反應、掛 in-progress 標籤。
# 送出提示詞後 15 秒內沒觀察到 working 或 blocked 就視為失敗並回滾（關 tab、移除 worktree、刪本次新建的分支）。
# 最後一行印出 JSON：{"tab":..,"pane":..,"path":..,"resumed":..,"state":"working"|"blocked"}
source "$(dirname "$0")/lib.sh"
REPO="${1:?}"; N="${2:?用法：start.sh <owner/repo> <N>}"
LINK="https://gitea.jsc.idv.tw/$REPO/issues/$N"
test "${HERDR_ENV:-}" = 1 || die "不在 Herdr 裡（HERDR_ENV≠1）"
CLONE="$(clone_root_for "$REPO")"
BRANCH="issue-$N"
WT="$(worktree_path "$N" "$CLONE")"

if [ "$(agent_status "$N")" != missing ]; then
  die "issue-$N 的 agent 還活著（tab $(tab_for_issue "$N")），不重複啟動"
fi
[ "$(issue_state "$REPO" "$N")" = open ] || die "#$N 不是 open"
BLOCKERS="$(open_blockers "$REPO" "$N")" || exit 1
[ -z "$BLOCKERS" ] || die "#$N 被還沒關閉的議題擋住：$(echo "$BLOCKERS" | tr '\n' ' ')（Gitea 依賴設定）。等它們關閉，或到 Gitea 拿掉依賴再啟動"

git -C "$CLONE" fetch --quiet origin
RESUMED=false
if git -C "$CLONE" show-ref --verify --quiet "refs/heads/$BRANCH"; then
  RESUMED=true
  if ! git -C "$CLONE" worktree list --porcelain | grep -qx "worktree $WT"; then
    git -C "$CLONE" worktree add --quiet "$WT" "$BRANCH"
  fi
else
  git -C "$CLONE" worktree add --quiet -b "$BRANCH" "$WT" origin/main
fi

TAB=""
# 回滾到跟沒跑過一樣：關 tab、移除 worktree；分支只在本次新建時刪除。
rollback() {
  [ -n "$TAB" ] && herdr tab close "$TAB" >/dev/null 2>&1 || true
  if git -C "$CLONE" worktree list --porcelain | grep -qx "worktree $WT"; then
    git -C "$CLONE" worktree remove --force "$WT" >/dev/null 2>&1 || true
  fi
  $RESUMED || git -C "$CLONE" branch -D "$BRANCH" >/dev/null 2>&1 || true
}

TAB_JSON="$(herdr tab create --workspace "${HERDR_WORKSPACE_ID:?}" --cwd "$WT" --label "#$N" --no-focus)"
TAB="$(jq_py 'print(find(d,"tab")["tab_id"])' <<<"$TAB_JSON")"
PANE="$(jq_py 'print(find(d,"root_pane")["pane_id"])' <<<"$TAB_JSON")"

START_ERR="$(mktemp)"
for _ in 1 2 3 4 5 6; do
  if herdr agent start "issue-$N" --kind claude --pane "$PANE" --timeout 90000 -- --model "$MODEL" >/dev/null 2>"$START_ERR"; then
    rm -f "$START_ERR"; break
  fi
  sleep 2
done
if [ -f "$START_ERR" ]; then
  cat "$START_ERR" >&2; rm -f "$START_ERR"
  rollback
  die "agent 啟動失敗，已回滾"
fi

# git 身分：與 tea 預設使用者一致（只設在這個 worktree，不動 clone 的設定）
GIT_USER="$(command tea login list --output json | jq_py "print(next((l['user'] for l in d if l['name']=='$HERDR_ISSUE_LOGIN'),''))")"
GIT_EMAIL="$(tea api "/user" | jq_py 'print(d.get("email") or "")' 2>/dev/null || true)"
git -C "$CLONE" config extensions.worktreeConfig true
# agent 在 worktree 裡自己跑的 git（push、fetch）也要有帳密：把 helper 設到 clone 的本地設定（worktree 共用），只對這個主機生效
GIT_HOST_URL="$(command tea login list --output json | jq_py "print(next((l['url'] for l in d if l['name']=='$HERDR_ISSUE_LOGIN'),''))")"
if [ -n "$GIT_HOST_URL" ]; then
  git -C "$CLONE" config --local --replace-all "credential.$GIT_HOST_URL.helper" "$SCRIPTS/git-credential.sh"
fi
git -C "$WT" config --worktree http.sslVerify false
git -C "$WT" config --worktree user.name "$GIT_USER"
[ -z "$GIT_EMAIL" ] || git -C "$WT" config --worktree user.email "$GIT_EMAIL"

if $RESUMED; then RESUME_LINE="分支已有先前進度，先看 git log 和議題核取方塊再接續。"; else RESUME_LINE=""; fi
PROMPT="$(sed -e "s|{LINK}|$LINK|g" -e "s|{REPO}|$REPO|g" -e "s|{N}|$N|g" -e "s|{S}|$SCRIPTS|g" -e "s|{LOGIN}|$HERDR_ISSUE_LOGIN|g" -e "s|{RESUME}|$RESUME_LINE|" "$SCRIPTS/prompt.txt")"

# 送出後必須觀察到 agent 進入 working 或 blocked；否則 Herdr 回非 0（agent_prompt_stalled、timeout、agent_blocked 等）。
PROMPT_ERR="$(mktemp)"
if PROMPT_OUT="$(herdr agent prompt "issue-$N" "$PROMPT" --wait --until working --until blocked --timeout 15000 2>"$PROMPT_ERR")"; then
  rm -f "$PROMPT_ERR"
else
  echo "gitea-issue: 送出提示詞後 agent 沒有反應，已回滾" >&2
  cat "$PROMPT_ERR" >&2; rm -f "$PROMPT_ERR"
  rollback
  exit 1
fi
STATE="$(jq_py 'print(find(d,"agent_status") or "")' <<<"$PROMPT_OUT" 2>/dev/null || true)"
case "$STATE" in working|blocked) ;; *) STATE="$(agent_status "$N")" ;; esac

ensure_label "$REPO"
tea issues edit "$N" --repo "$REPO" --remove-labels "$LABEL" >/dev/null 2>&1 || true
tea issues edit "$N" --repo "$REPO" --add-labels "$LABEL" >/dev/null

printf '{"tab":"%s","pane":"%s","path":"%s","resumed":%s,"state":"%s"}\n' "$TAB" "$PANE" "$WT" "$RESUMED" "$STATE"