/**
 * Extracted from AI 数据复盘助手: src/stores/chat.ts,
 * isRunActive / canApplyAgentChange (2026-09-10).
 * Vue / Pinia state is passed explicitly; validation branches are preserved.
 * This frontend guard does not provide server authorization or idempotency.
 */
export interface Change {
  status: "pending" | "applied" | "undone";
  sourceDocumentId: string;
  runId: string;
}

export interface Run {
  runId: string;
  sessionId: string;
  provider: string;
  model: string;
}

export interface Context {
  documentId?: string;
  activeRun: Run | null;
  activeRunId: string;
  activeSessionId: string;
  currentSessionDocumentId?: string;
  settings?: { aiProvider: string; modelName: string };
}

export function canApplyAgentChange(change: Change | null, context: Context): boolean {
  if (!change || change.status !== "pending" || !context.documentId
    || change.sourceDocumentId !== context.documentId) return false;

  const run = context.activeRun;
  if (run) {
    const sameRun = context.activeRunId === run.runId;
    const sameSession = context.activeSessionId === run.sessionId;
    const sameModel = !context.settings || (
      context.settings.aiProvider === run.provider
      && context.settings.modelName === run.model
    );
    return sameRun && sameSession && sameModel && run.runId === change.runId;
  }

  return context.currentSessionDocumentId === context.documentId;
}