/**
 * GitToolsNudge — mid-run reminder when the user asked to commit/push/open a PR/
 * review/approve/tag/release/file an issue but no git/gh exec has run yet.
 *
 * Soft: max 1 fire. Pairs with evaluateInventedGitCompletionGate.
 */

export const GIT_TOOLS_NUDGE_MAX_ATTEMPTS = 1;

const GIT_USER_RE =
  /(?:\bgit\s+commit\b|\bcommit (?:and )?push\b|\bpush (?:to )?(?:origin|remote)\b|\bopen (?:a )?PR\b|\bcreate (?:a )?pull request\b|\breview (?:the )?PR\b|\bapprove (?:the )?PR\b|\bgh\s+pr\b|\bgit\s+tag\b|\btag (?:a )?release\b|\bcreate (?:a )?release\b|\bgh\s+release\b|\bopen (?:a )?GitHub issue\b|\bfile (?:an? )?issue\b|\bgh\s+issue\b|提交代码|推送到|创建 PR|commit 一下|打 tag|发 release|创建 issue|审查 PR|批准 PR)/iu;

const EXEC_TOOLS = new Set(['exec', 'exec_background']);

export interface GitToolsNudgeRequest {
  userText: string;
  toolCallsByName: Record<string, number>;
  /** Session messages — used to detect git-shaped exec commands. */
  messages?: Array<{ role?: string; content?: unknown }>;
  totalToolCalls: number;
  attempts: number;
}

export type GitToolsNudgeResult =
  | { fire: false }
  | { fire: true; correction: string };

/** Collect command strings from exec / exec_background tool_use blocks. */
export function collectExecCommandsFromMessages(
  messages: Array<{ role?: string; content?: unknown }> | undefined,
): string[] {
  if (!messages?.length) return [];
  const out: string[] = [];
  for (const m of messages) {
    if (!m || m.role !== 'assistant' || !Array.isArray(m.content)) continue;
    for (const block of m.content) {
      const b = block as { type?: string; name?: string; input?: unknown };
      if (b?.type !== 'tool_use' || !b.name || !EXEC_TOOLS.has(b.name)) continue;
      const input = b.input;
      if (!input || typeof input !== 'object') continue;
      const o = input as Record<string, unknown>;
      for (const key of ['command', 'cmd', 'input'] as const) {
        if (typeof o[key] === 'string' && String(o[key]).trim()) {
          out.push(String(o[key]));
          break;
        }
      }
    }
  }
  return out;
}

function sawGitExec(
  messages: Array<{ role?: string; content?: unknown }> | undefined,
  byName: Record<string, number>,
): boolean {
  if ((byName.git_commit ?? 0) > 0 || (byName.git_push ?? 0) > 0) return true;
  for (const cmd of collectExecCommandsFromMessages(messages)) {
    if (/\bgit\b|\bgh\s+(?:pr|release|issue)\b/i.test(cmd)) return true;
  }
  return false;
}

export function evaluateGitToolsNudge(request: GitToolsNudgeRequest): GitToolsNudgeResult {
  if (request.attempts >= GIT_TOOLS_NUDGE_MAX_ATTEMPTS) return { fire: false };
  if (request.totalToolCalls < 1) return { fire: false };

  const user = (request.userText || '').trim();
  if (!user || !GIT_USER_RE.test(user)) return { fire: false };

  if (sawGitExec(request.messages, request.toolCallsByName)) {
    return { fire: false };
  }

  // User only asked status / history, not to perform VCS.
  if (
    /(?:git status|git log|what(?:'s| is) (?:the )?status|有没有提交)/iu.test(user) &&
    !/(?:commit|push|PR|tag|release|issue|review|approve|提交代码|推送)/iu.test(user)
  ) {
    return { fire: false };
  }

  return {
    fire: true,
    correction:
      '[System] The user asked for a git/gh VCS action (commit/push/PR/review/approve/tag/release/issue), and tools have already run without a matching `git` / `gh pr|release|issue` command. ' +
      'If VCS action is required: run the real command via `exec` and report its output. ' +
      'If you are waiting for approval, say so — do not invent commits, reviews, tags, releases, or issues.',
  };
}