import type { AgentMessage } from "@earendil-works/pi-agent-core";

export function normalizeText(value: string, maxChars: number): string {
  const normalized = value.replace(/\s+/g, " ").trim();
  if (normalized.length <= maxChars) return normalized;
  return `${normalized.slice(0, Math.max(1, maxChars - 1)).trimEnd()}…`;
}

export function assistantText(message: AgentMessage | undefined): string {
  if (!message || message.role !== "assistant" || !Array.isArray(message.content)) return "";
  return message.content
    .filter((part): part is { type: "text"; text: string } => part.type === "text")
    .map((part) => part.text)
    .join("\n")
    .trim();
}

export function latestAssistant(messages: AgentMessage[]): AgentMessage | undefined {
  for (let index = messages.length - 1; index >= 0; index -= 1) {
    if (messages[index]?.role === "assistant") return messages[index];
  }
  return undefined;
}

export function formatDuration(milliseconds: number): string {
  const seconds = Math.max(0, Math.round(milliseconds / 1000));
  if (seconds < 60) return `${seconds} 秒`;
  const minutes = Math.floor(seconds / 60);
  const rest = seconds % 60;
  if (minutes < 60) return rest ? `${minutes} 分 ${rest} 秒` : `${minutes} 分钟`;
  const hours = Math.floor(minutes / 60);
  const minuteRest = minutes % 60;
  return minuteRest ? `${hours} 小时 ${minuteRest} 分` : `${hours} 小时`;
}

export function sanitizeEventPart(value: string): string {
  return value.replace(/[^A-Za-z0-9._:-]+/g, "-").replace(/^-+|-+$/g, "").slice(0, 80) || "unknown";
}