import fs from 'node:fs';
import path from 'node:path';
import { resolveUserAddressName } from './user-publish.mjs';

export const USER_MEMORY_PROFILE_FILENAME = '.tkmind-profile.json';
export const USER_MEMORY_PROFILE_VERSION = 1;

export function buildInitialUserMemoryProfile({
  userId,
  displayName,
  username,
  slug,
  now = Date.now(),
}) {
  const addressName = resolveUserAddressName({ displayName, username, slug });
  return {
    version: USER_MEMORY_PROFILE_VERSION,
    userId,
    displayName: addressName,
    language: 'zh-CN',
    responseStyle: 'balanced',
    preferences: [],
    createdAt: now,
    updatedAt: now,
  };
}

export function resolveUserMemoryProfilePath(workspaceRoot) {
  return path.join(workspaceRoot, USER_MEMORY_PROFILE_FILENAME);
}

export function loadUserMemoryProfile(workspaceRoot) {
  const profilePath = resolveUserMemoryProfilePath(workspaceRoot);
  if (!fs.existsSync(profilePath)) return null;
  try {
    const raw = fs.readFileSync(profilePath, 'utf8');
    const parsed = JSON.parse(raw);
    if (!parsed || typeof parsed !== 'object') return null;
    return parsed;
  } catch {
    return null;
  }
}

export function ensureUserMemoryProfile(workspaceRoot, context) {
  const profilePath = resolveUserMemoryProfilePath(workspaceRoot);
  const existing = loadUserMemoryProfile(workspaceRoot);
  if (existing) {
    const addressName = resolveUserAddressName(context);
    const nextDisplayName = addressName || existing.displayName;
    if (nextDisplayName && nextDisplayName !== existing.displayName) {
      const updated = {
        ...existing,
        displayName: nextDisplayName,
        updatedAt: Date.now(),
      };
      fs.writeFileSync(profilePath, `${JSON.stringify(updated, null, 2)}\n`, 'utf8');
      return updated;
    }
    return existing;
  }

  const profile = buildInitialUserMemoryProfile({
    userId: context.userId,
    displayName: context.displayName,
    username: context.username,
    slug: context.slug,
  });
  fs.writeFileSync(profilePath, `${JSON.stringify(profile, null, 2)}\n`, 'utf8');
  return profile;
}

export function renderMemoryStoreGuidance({ addressName }) {
  const name = addressName || '用户';
  return [
    '## TKMind 长期记忆（L3 / memory 扩展）',
    '',
    `- 当前服务对象：**${name}**（仅此用户，不得与其他用户混淆）`,
    '- 使用 memory 工具记录用户**明确表达**的偏好、习惯与稳定事实',
    '- 记忆分类建议：',
    '  - `preference`：回复风格、格式、语言、称呼习惯',
    '  - `project`：当前项目目标、约定、技术选型（与 L2 项目记忆互补）',
    '  - `fact`：长期稳定、可复用的事实（如部门、常用工具）',
    '- 用户说「忘记…」「不要再…」「取消偏好…」时，必须更新或删除对应记忆',
    '- **禁止**记录其他用户的信息；**禁止**猜测未明确表达的偏好',
    '- 与 L2 项目记忆（harness）分工：L2 记近期工作与决策摘要；L3 记可跨会话复用的个人偏好',
  ].join('\n');
}

function renderPreferenceLines(profile) {
  const items = Array.isArray(profile?.preferences) ? profile.preferences : [];
  if (items.length === 0) {
    return ['- （暂无结构化偏好 — 可在对话中用 memory 工具补充）'];
  }
  return items.map((item) => {
    if (typeof item === 'string') return `- ${item}`;
    const category = item?.category ? `[${item.category}] ` : '';
    const label = item?.label ?? item?.key ?? 'preference';
    const value = item?.value ?? item?.content ?? '';
    return `- ${category}${label}：${value}`;
  });
}

export function renderUserMemoryProfileForHarness(profile, context = {}) {
  const addressName = resolveUserAddressName({
    displayName: profile?.displayName ?? context.displayName,
    username: context.username,
    slug: context.slug,
  });
  const language = profile?.language === 'zh-CN' ? '简体中文' : (profile?.language ?? '简体中文');
  const styleMap = {
    concise: '简洁直接，少废话',
    detailed: '详细完整，必要时展开',
    balanced: '简洁务实，必要时补充细节',
  };
  const responseStyle = styleMap[profile?.responseStyle] ?? styleMap.balanced;

  return [
    '## TKMind 用户偏好画像（L3）',
    '',
    `- 用户称呼：**${addressName}**`,
    `- 界面语言：${language}`,
    `- 默认回复风格：${responseStyle}`,
    '',
    '### 已记录的结构化偏好',
    ...renderPreferenceLines(profile),
  ].join('\n');
}

export function buildSessionMemoryEntries({
  workingDir,
  sessionPolicy,
  sandboxConstraints = null,
  userContext = null,
}) {
  const entries = [];

  if (sandboxConstraints?.trim()) {
    entries.push({
      title: 'TKMind 用户空间沙箱',
      content: sandboxConstraints.trim(),
    });
  }

  if (!hasMemoryStore(sessionPolicy)) {
    return entries;
  }

  const profile =
    loadUserMemoryProfile(workingDir) ??
    (userContext?.userId
      ? ensureUserMemoryProfile(workingDir, userContext)
      : null);

  const addressName = resolveUserAddressName({
    displayName: profile?.displayName ?? userContext?.displayName,
    username: userContext?.username,
    slug: userContext?.slug,
  });

  entries.push({
    title: 'TKMind 长期记忆规则',
    content: renderMemoryStoreGuidance({ addressName }),
  });

  if (profile) {
    entries.push({
      title: 'TKMind 用户偏好画像',
      content: renderUserMemoryProfileForHarness(profile, userContext ?? {}),
    });
  }

  return entries;
}

export function hasMemoryStore(sessionPolicy) {
  return (sessionPolicy?.extensionOverrides ?? []).some((ext) => ext.name === 'memory');
}