export const GOAL_RUN_INTENT_PATTERNS = [
  /(?:长期目标|当前目标|目标是|计划要|正在建设|准备实现|希望长期)/i,
  /(?:分阶段|多步骤|长期任务|持续跟进|帮我规划并执行)/i,
];

export function isGoalRunIntent(text) {
  const normalized = String(text ?? '').trim();
  if (!normalized) return false;
  return GOAL_RUN_INTENT_PATTERNS.some((pattern) => pattern.test(normalized));
}

function envFlag(value, fallback = false) {
  const raw = String(value ?? '').trim().toLowerCase();
  if (!raw) return fallback;
  return ['1', 'true', 'yes', 'on'].includes(raw);
}

function parseUserIdSet(raw) {
  return new Set(
    String(raw ?? '')
      .split(/[,;\s]+/)
      .map((item) => item.trim())
      .filter(Boolean),
  );
}

export function isGoalRunEnabledForUser(userId, env = process.env) {
  if (!envFlag(env.GOAL_RUN_ENABLED, false)) return false;
  const canaryUserIds = parseUserIdSet(env.GOAL_RUN_CANARY_USER_IDS);
  if (!canaryUserIds.size) return true;
  return canaryUserIds.has(String(userId ?? '').trim());
}

export function extractUserMessageDisplayText(userMessage) {
  if (!userMessage) return '';
  if (typeof userMessage === 'string') return userMessage.trim();
  const metadataText = String(userMessage?.metadata?.displayText ?? '').trim();
  if (metadataText) return metadataText;
  const content = userMessage?.content;
  if (typeof content === 'string') return content.trim();
  if (Array.isArray(content)) {
    for (const item of content) {
      if (typeof item === 'string' && item.trim()) return item.trim();
      if (item?.type === 'text' && String(item.text ?? '').trim()) {
        return String(item.text).trim();
      }
    }
  }
  return '';
}

export function deriveGoalTitleFromText(text, maxLength = 80) {
  const normalized = String(text ?? '').replace(/\s+/g, ' ').trim();
  if (!normalized) return '长期任务';
  return normalized.length <= maxLength
    ? normalized
    : `${normalized.slice(0, Math.max(0, maxLength - 1))}…`;
}

export function buildGoalContinueUserMessage(feedback = null, { id = null } = {}) {
  const displayText = String(feedback ?? '').trim()
    ? `继续下一阶段。补充说明：${String(feedback).trim()}`
    : '继续执行下一阶段';
  const messageId = id ?? (typeof crypto !== 'undefined' && crypto.randomUUID
    ? crypto.randomUUID()
    : `goal-continue-${Date.now()}`);
  return {
    id: messageId,
    role: 'user',
    content: [{ type: 'text', text: displayText }],
    metadata: {
      userVisible: true,
      displayText,
    },
  };
}