const crypto = require('crypto');
const fs = require('fs');
const path = require('path');
const { spawn } = require('child_process');
const { AgentContextBuilder, selectAuthoritativeHistory } = require('./agent-context-builder');

const RISK_PATTERN = /合同|签约|资质|合规|保证|承诺|最低价|贷款|利率|投诉|退款|发票|身份证|银行卡|法律|违约/;
const NO_REPLY_NEEDED_PATTERN = /^(?:收到|好|好的|好嘞|明白|明白了|知道了|了解|了解了|谢谢|谢谢你|谢谢您|感谢|ok|okay|嗯+|哦+)$/i;

function isNoReplyNeededMessage(input = '') {
  const normalized = String(input || '').trim().replace(/[，。！？!?,.~～]+$/g, '').trim();
  return Boolean(normalized && NO_REPLY_NEEDED_PATTERN.test(normalized));
}

function claudeSessionResetReason(error) {
  const detail = `${error?.message || ''} ${error?.subtype || ''}`;
  if (/error_max_budget_usd|max[-_\s]?budget[-_\s]?usd/i.test(detail)) return 'budget_exceeded';
  if (/session|conversation|resume/i.test(detail)) return 'session_invalid';
  return '';
}

function parseClaudeProcessResult(stdout = '', stderr = '', code = 0) {
  let payload = null;
  try { payload = JSON.parse(String(stdout || '').trim()); } catch {}
  if (code === 0) {
    return payload
      ? { payload }
      : { error: `Claude Code 未返回有效 JSON${stderr ? '，请检查 Fmode 配置' : ''}` };
  }

  const structured = payload?.structured_output;
  const usableStructuredOutput = structured
    && typeof structured === 'object'
    && !Array.isArray(structured)
    && Object.prototype.hasOwnProperty.call(structured, 'reply')
    && Object.prototype.hasOwnProperty.call(structured, 'confidence')
    && Object.prototype.hasOwnProperty.call(structured, 'intent');
  const safeError = String(stderr || '')
    .replace(/Bearer\s+\S+/gi, 'Bearer [REDACTED]')
    .replace(/\bsk-[A-Za-z0-9_-]{6,}\b/g, 'sk-[REDACTED]')
    .trim()
    .slice(0, 300);
  const structuredError = String(payload?.error || payload?.message || payload?.result || payload?.subtype || '').trim().slice(0, 300);
  const detail = safeError || structuredError || `退出码 ${code}`;
  if (usableStructuredOutput) {
    return {
      payload: {
        ...payload,
        is_error: false,
        process_warning: { exitCode: code, detail },
      },
    };
  }
  return { error: `Claude Code 调用失败（退出码 ${code}）${detail ? `：${detail}` : ''}` };
}

class AgentNotConfiguredError extends Error {
  constructor() {
    super('Agent 模型尚未配置，消息已保留但不会生成伪造回复');
    this.name = 'AgentNotConfiguredError';
  }
}

class OpenAICompatibleClient {
  constructor(config) { this.config = config; }

  async complete(messages, tools) {
    if (!this.config.apiKey) throw new AgentNotConfiguredError();
    const body = {
      model: this.config.model,
      temperature: 0.2,
      messages,
    };
    if (Array.isArray(tools) && tools.length) {
      body.tools = tools;
      body.tool_choice = 'auto';
    }
    const response = await fetch(`${this.config.baseUrl}/chat/completions`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${this.config.apiKey}` },
      body: JSON.stringify(body),
      signal: AbortSignal.timeout(30000),
    });
    const payload = await response.json().catch(() => ({}));
    if (!response.ok) throw new Error(`Agent 上游暂时不可用（HTTP ${response.status}）`);
    const message = payload.choices?.[0]?.message;
    if (!message) throw new Error('Agent 上游没有返回有效消息');
    return message;
  }
}

class AnthropicCompatibleClient {
  constructor(config) { this.config = config; }

  toAnthropicMessages(messages) {
    return messages.filter(message => message.role !== 'system').map(message => {
      if (message.role === 'tool') {
        return { role: 'user', content: [{ type: 'tool_result', tool_use_id: message.tool_call_id, content: message.content }] };
      }
      if (message.role === 'assistant' && message.tool_calls?.length) {
        const content = [];
        if (message.content) content.push({ type: 'text', text: message.content });
        for (const call of message.tool_calls) {
          let input = {};
          try { input = JSON.parse(call.function.arguments || '{}'); } catch {}
          content.push({ type: 'tool_use', id: call.id, name: call.function.name, input });
        }
        return { role: 'assistant', content };
      }
      return { role: message.role, content: message.content };
    });
  }

  async complete(messages, tools) {
    if (!this.config.apiKey) throw new AgentNotConfiguredError();
    const system = messages.find(message => message.role === 'system')?.content || '';
    const body = {
      model: this.config.model,
      max_tokens: 1400,
      temperature: 0.2,
      system,
      messages: this.toAnthropicMessages(messages),
    };
    if (Array.isArray(tools) && tools.length) {
      body.tools = tools.map(tool => ({
        name: tool.function.name,
        description: tool.function.description,
        input_schema: tool.function.parameters,
      }));
    }
    const response = await fetch(`${this.config.baseUrl}/v1/messages`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'anthropic-version': '2023-06-01',
        'x-api-key': this.config.apiKey,
        Authorization: `Bearer ${this.config.apiKey}`,
      },
      body: JSON.stringify(body),
      signal: AbortSignal.timeout(45000),
    });
    const payload = await response.json().catch(() => ({}));
    if (!response.ok) throw new Error(`Agent 上游暂时不可用（HTTP ${response.status}）`);
    const blocks = Array.isArray(payload.content) ? payload.content : [];
    const toolCalls = blocks.filter(block => block.type === 'tool_use').map(block => ({
      id: block.id,
      function: { name: block.name, arguments: JSON.stringify(block.input || {}) },
    }));
    return {
      content: blocks.filter(block => block.type === 'text').map(block => block.text).join('\n'),
      ...(toolCalls.length ? { tool_calls: toolCalls } : {}),
    };
  }
}

function readJson(filePath, fallback = {}) {
  try { return JSON.parse(fs.readFileSync(filePath, 'utf8')); }
  catch { return fallback; }
}

function writeJsonAtomic(filePath, value) {
  fs.mkdirSync(path.dirname(filePath), { recursive: true });
  const tempPath = `${filePath}.${process.pid}.tmp`;
  fs.writeFileSync(tempPath, JSON.stringify(value, null, 2), 'utf8');
  fs.renameSync(tempPath, filePath);
}

function resolveClaudeExecutable(config = {}) {
  const pathCandidates = String(process.env.PATH || '')
    .split(path.delimiter)
    .map(item => item.trim().replace(/^"|"$/g, ''))
    .filter(Boolean)
    .flatMap(dir => process.platform === 'win32'
      ? [
          path.join(dir, 'claude.exe'),
          path.join(dir, 'node_modules', '@anthropic-ai', 'claude-code', 'bin', 'claude.exe'),
        ]
      : [path.join(dir, 'claude')]);
  const candidates = [
    config.claudeExecutable,
    process.env.CLAUDE_CODE_EXECUTABLE,
    ...pathCandidates,
    path.join(path.dirname(process.execPath), 'node_modules', '@anthropic-ai', 'claude-code', 'bin', 'claude.exe'),
    path.join(process.env.APPDATA || '', 'npm', 'node_modules', '@anthropic-ai', 'claude-code', 'bin', 'claude.exe'),
  ].filter(Boolean);
  return candidates.find(candidate => fs.existsSync(candidate)) || '';
}

function normalizeSessionLabel(value) {
  return String(value || '企微客户')
    .trim()
    .replace(/[\\/:*?"<>|\r\n]+/g, '-')
    .replace(/\s+/g, '-')
    .replace(/-+/g, '-')
    .replace(/^-|-$/g, '')
    .slice(0, 24) || '企微客户';
}

function buildClaudeSessionName(context = {}, key = '') {
  const customerName = normalizeSessionLabel(
    context.conversation?.contact_name || context.conversation?.displayName || '企微客户'
  );
  const reference = crypto.createHash('sha256').update(String(key || 'qiwei-default')).digest('hex').slice(0, 4);
  return `企微客户-${customerName}-${reference}`;
}

function uniqueIntelligence(items = [], keyFn) {
  const seen = new Set();
  return items.filter(item => {
    const key = keyFn(item);
    if (!key || seen.has(key)) return false;
    seen.add(key);
    return true;
  });
}

function normalizedEvidence(value) {
  return String(value || '').toLowerCase().replace(/[\s，。！？；：、,.!?;:'"“”‘’（）()【】\[\]-]+/g, '');
}

function evidenceIsSupported(evidence, authoritativeText) {
  const source = normalizedEvidence(authoritativeText);
  const claim = normalizedEvidence(evidence);
  if (!source || !claim) return false;
  return source.includes(claim) || (source.length >= 4 && claim.includes(source));
}

function supportedModelProfileUpdates(updates = {}, authoritativeText = '') {
  if (!updates || typeof updates !== 'object' || Array.isArray(updates)) return {};
  const explicitNumbers = new Set(String(authoritativeText || '').match(/\d+(?:\.\d+)?/g) || []);
  return Object.fromEntries(Object.entries(updates).filter(([, value]) => {
    if (value === undefined || value === null || value === '') return false;
    const values = Array.isArray(value) ? value : [value];
    return values.every(item => typeof item === 'number'
      ? explicitNumbers.has(String(item))
      : evidenceIsSupported(String(item), authoritativeText));
  }));
}

function unsupportedAttributedClaims(final = {}, authoritativeHistory = []) {
  const output = `${String(final.reply || '')}\n${String(final.reason || '')}`;
  const source = authoritativeHistory.map(item => item.content || '').join('\n');
  const claims = [];
  const marker = /(?:您|客户)(?:之前|此前|刚才)?(?:曾经)?(?:提到|说过|说|表示)/g;
  for (const match of output.matchAll(marker)) {
    const tail = output.slice((match.index || 0) + match[0].length, (match.index || 0) + match[0].length + 100);
    const quoted = tail.match(/^\s*[：:]?\s*["“‘']([^"”’'\r\n]{2,60})["”’']/);
    if (quoted && !evidenceIsSupported(quoted[1], source)) claims.push(quoted[1].trim());
  }
  return [...new Set(claims)];
}

function groundedConfirmationReply(profile = {}, inboundContent = '') {
  const budget = Number(profile.budgetWan || profile.budget || 0);
  const intent = profile.intent || profile.purpose || profile.need || '';
  const confirmed = [intent, budget ? `预算 ${budget}` : '', profile.timeline || ''].filter(Boolean).join('、');
  const opening = confirmed ? `收到，我先按${confirmed}继续整理。` : '收到，您刚才的信息我已经记录。';
  const questions = [];
  if (!intent) questions.push('这次最希望解决的核心问题是什么');
  if (budget && (!profile.budgetType || profile.budgetType === '待确认')) questions.push(`预算 ${budget} 是目标值还是上限`);
  if (!profile.timeline) questions.push('希望什么时候推进');
  if (!questions.length) return `${opening}我会先核对可用方案，再给您准确回复。`;
  return `${opening}为了避免理解偏差，想再确认一下：${questions.join('；')}？`;
}

function enforceAuthoritativeGrounding(final = {}, authoritativeHistory = [], profile = {}, inboundContent = '') {
  const unsupported = unsupportedAttributedClaims(final, authoritativeHistory);
  if (!unsupported.length) return { ...final, groundingWarnings: [] };
  return {
    ...final,
    reply: groundedConfirmationReply(profile, inboundContent),
    reason: `检测到模型引用了本轮有效会话中不存在的客户原话，已降级为确认式草稿。未支持内容：${unsupported.join('、')}`,
    confidence: Math.min(clamp(final.confidence), 0.68),
    requiresHuman: true,
    groundingWarnings: unsupported,
  };
}

function extractExplicitCustomerIntelligence(content, currentProfile = {}, modelOutput = {}) {
  const text = String(content || '').trim();
  const profileUpdates = supportedModelProfileUpdates(modelOutput.profileUpdates, text);
  const amount = text.match(/(\d+(?:\.\d+)?)\s*(?:万|元)?/);
  if (amount && (/预算|费用|报价|价格/.test(text))) {
    profileUpdates.budgetWan = Number(amount[1]);
    profileUpdates.budgetType = /上限|最多/.test(text) ? '上限' : /目标|大概/.test(text) ? '目标' : (currentProfile.budgetType || '待确认');
  }
  if (/今天|明天|本周|这周|尽快|马上|急/.test(text)) profileUpdates.urgency = '高';

  const mergedProfile = { ...currentProfile, ...profileUpdates };
  const factEvidence = [
    mergedProfile.intent || mergedProfile.purpose ? `意图${mergedProfile.intent || mergedProfile.purpose}` : '',
    mergedProfile.need || mergedProfile.needs ? `需求${mergedProfile.need || mergedProfile.needs}` : '',
    mergedProfile.budgetWan || mergedProfile.budget ? `预算${mergedProfile.budgetWan || mergedProfile.budget}` : '',
    mergedProfile.timeline ? `计划时间${mergedProfile.timeline}` : '',
    mergedProfile.decisionMaker ? `决策人${mergedProfile.decisionMaker}` : '',
  ].filter(Boolean).join('，').slice(0, 240);
  const evidence = text.slice(0, 240);
  const tasks = Array.isArray(modelOutput.tasks)
    ? modelOutput.tasks.filter(item => evidenceIsSupported(item?.evidence, text)).map(item => ({
        ...item,
        businessKey: item.businessKey || item.key,
        managedBy: 'agent',
      }))
    : [];
  const alerts = Array.isArray(modelOutput.alerts)
    ? modelOutput.alerts.filter(item => evidenceIsSupported(item?.evidence, text)).map(item => ({
        ...item,
        businessKey: item.businessKey || item.key,
        managedBy: 'agent',
      }))
    : [];
  const hasBudget = Number(mergedProfile.budgetWan || mergedProfile.budget || 0) > 0;
  const hasPurpose = Boolean(mergedProfile.intent || mergedProfile.purpose || mergedProfile.need || mergedProfile.needs);
  const hasTimeline = Boolean(mergedProfile.timeline);

  if ((hasBudget || hasPurpose) && (!hasPurpose || !hasTimeline)) {
    tasks.push({
      businessKey: 'qualification:purpose_and_timeline',
      managedBy: 'rule',
      type: 'qualification',
      title: '确认客户目标与计划时间',
      owner: '待分配',
      dueAt: '',
      priority: 'high',
      reason: `${[!hasPurpose ? '客户目标' : '', !hasTimeline ? '计划时间' : ''].filter(Boolean).join('和')}仍不明确。`,
      evidence: factEvidence || evidence,
    });
  }
  if (hasPurpose && hasTimeline) {
    alerts.push({
      businessKey: 'high_intent:core_demand_ready',
      managedBy: 'rule',
      type: 'high_intent',
      severity: 'high',
      title: '客户核心需求已基本成形',
      detail: '客户目标和计划时间已具备，可以从泛咨询进入下一步服务安排。',
      evidence: factEvidence || evidence,
      recommendedAction: '核对关键约束并确认下一步动作。',
    });
  }
  if (/投诉|不满意|骗人|退款|举报|再也不|太差|生气/.test(text)) {
    alerts.push({
      businessKey: 'complaint:manual_takeover',
      managedBy: 'event',
      type: 'complaint',
      severity: 'critical',
      title: '检测到投诉或强烈负面情绪',
      detail: '该消息不应由自动回复独立处理。',
      evidence,
      recommendedAction: '立即人工接管，先确认事实和客户诉求。',
    });
  } else if (/今天|明天|本周|这周|尽快|马上|急/.test(text)) {
    alerts.push({
      businessKey: 'time_sensitive:follow_up',
      managedBy: 'event',
      type: 'time_sensitive',
      severity: 'high',
      title: '客户表达了明确时效要求',
      detail: '消息中包含较紧迫的时间表达。',
      evidence,
      recommendedAction: '优先确认具体截止时间并安排跟进。',
    });
  }

  return {
    profileUpdates,
    tasks: uniqueIntelligence(tasks, item => `${item?.businessKey || item?.key || ''}|${item?.type || ''}|${item?.title || ''}`.toLowerCase()).slice(0, 8),
    alerts: uniqueIntelligence(alerts, item => `${item?.businessKey || item?.key || ''}|${item?.type || ''}|${item?.title || ''}`.toLowerCase()).slice(0, 6),
  };
}

class ClaudeCodeSessionStore {
  constructor(filePath, project = {}) {
    this.filePath = filePath;
    this.project = project;
  }

  loadState() {
    const state = readJson(this.filePath, { version: 1, project: {}, sessions: {} });
    state.version = 1;
    state.sessions ||= {};
    state.project ||= {};
    state.project.projectId = this.project.projectId || state.project.projectId || 'qiwei-project';
    state.project.projectRoot = this.project.projectRoot || state.project.projectRoot || '';
    state.project.controllerSessionId = this.project.mainSessionId
      || state.project.controllerSessionId
      || crypto.randomUUID();
    state.project.boundMainSessionId = this.project.mainSessionId || state.project.boundMainSessionId || null;
    return state;
  }

  get(key) {
    return this.loadState().sessions?.[key] || null;
  }

  ensure(key, metadata = {}) {
    const state = this.loadState();
    if (!state.sessions[key]) {
      state.sessions[key] = {
        id: crypto.randomUUID(),
        initialized: false,
        role: 'customer-agent',
        projectId: state.project.projectId,
        parentControllerSessionId: state.project.controllerSessionId,
        epochStartedAt: new Date().toISOString(),
        epochTurnCount: 0,
        memoryVersion: Number(metadata.memoryVersion || 0),
        createdAt: new Date().toISOString(),
      };
    }
    const session = state.sessions[key];
    session.role ||= 'customer-agent';
    session.projectId ||= state.project.projectId;
    session.parentControllerSessionId ||= state.project.controllerSessionId;
    if (metadata.customerName) session.customerName = String(metadata.customerName).trim().slice(0, 80);
    if (metadata.displayName) session.displayName = String(metadata.displayName).trim().slice(0, 80);
    if (metadata.memoryVersion !== undefined) session.latestMemoryVersion = Number(metadata.memoryVersion || 0);
    writeJsonAtomic(this.filePath, state);
    return session;
  }

  markInitialized(key, metadata = {}) {
    const state = this.loadState();
    if (!state.sessions?.[key]) return;
    state.sessions[key].initialized = true;
    state.sessions[key].epochTurnCount = Number(state.sessions[key].epochTurnCount || 0) + 1;
    if (metadata.memoryVersion !== undefined) state.sessions[key].latestMemoryVersion = Number(metadata.memoryVersion || 0);
    state.sessions[key].updatedAt = new Date().toISOString();
    writeJsonAtomic(this.filePath, state);
  }

  setRole(key, role) {
    const state = this.loadState();
    if (!state.sessions?.[key]) return false;
    state.sessions[key].role = String(role || 'customer-agent');
    state.sessions[key].updatedAt = new Date().toISOString();
    writeJsonAtomic(this.filePath, state);
    return true;
  }

  reset(key, metadata = {}) {
    const state = this.loadState();
    const previous = state.sessions[key] || null;
    const epochHistory = previous ? [
      ...(previous.epochHistory || []),
      {
        id: previous.id,
        startedAt: previous.epochStartedAt || previous.createdAt,
        endedAt: new Date().toISOString(),
        turnCount: Number(previous.epochTurnCount || 0),
        memoryVersion: Number(previous.memoryVersion || 0),
        latestMemoryVersion: Number(previous.latestMemoryVersion || previous.memoryVersion || 0),
        closedReason: metadata.closedReason || 'manual_reset',
      },
    ].slice(-50) : [];
    state.sessions[key] = {
      id: crypto.randomUUID(),
      initialized: false,
      role: 'customer-agent',
      projectId: state.project.projectId,
      parentControllerSessionId: state.project.controllerSessionId,
      parentSessionId: metadata.parentSessionId || previous?.id || undefined,
      closedReason: metadata.closedReason || undefined,
      epochStartedAt: new Date().toISOString(),
      epochTurnCount: 0,
      memoryVersion: Number(metadata.memoryVersion || 0),
      epochHistory,
      customerName: metadata.customerName || undefined,
      displayName: metadata.displayName || undefined,
      createdAt: new Date().toISOString(),
    };
    writeJsonAtomic(this.filePath, state);
    return state.sessions[key];
  }

  rotateIfNeeded(key, metadata = {}, policy = {}) {
    const session = this.ensure(key, metadata);
    if (!session.initialized) return { session, reason: '' };
    const maxTurns = Number(policy.maxTurns || 0);
    const maxAgeMs = Number(policy.maxAgeMs || 0);
    const ageMs = Date.now() - Date.parse(session.epochStartedAt || session.createdAt || 0);
    const reason = maxTurns > 0 && Number(session.epochTurnCount || 0) >= maxTurns
      ? 'epoch_turn_limit'
      : maxAgeMs > 0 && Number.isFinite(ageMs) && ageMs >= maxAgeMs
        ? 'epoch_age_limit'
        : '';
    if (!reason) return { session, reason: '' };
    return {
      session: this.reset(key, { ...metadata, parentSessionId: session.id, closedReason: reason }),
      reason,
    };
  }
}

class ClaudeCodeClient {
  constructor(config, contextBuilder = null) {
    this.config = config;
    this.executable = resolveClaudeExecutable(config);
    this.workdir = path.resolve(config.claudeWorkdir || process.cwd());
    this.sessionStore = new ClaudeCodeSessionStore(config.claudeSessionFile, {
      projectId: config.claudeProjectId,
      projectRoot: this.workdir,
      mainSessionId: config.claudeMainSessionId,
    });
    this.queues = new Map();
    this.contextBuilder = contextBuilder || new AgentContextBuilder({ config });
  }

  isConfigured() {
    return Boolean(this.executable && fs.existsSync(this.workdir));
  }

  outputSchema() {
    return this.config.outputSchema || {
      type: 'object',
      additionalProperties: false,
      properties: {
        reply: { type: 'string' },
        confidence: { type: 'number', minimum: 0, maximum: 1 },
        intent: { type: 'string' },
        reason: { type: 'string' },
        requiresHuman: { type: 'boolean' },
        profileUpdates: { type: 'object' },
        tasks: {
          type: 'array',
          maxItems: 6,
          items: {
            type: 'object',
            additionalProperties: false,
            properties: {
              key: { type: 'string' },
              type: { type: 'string' },
              title: { type: 'string' },
              owner: { type: 'string' },
              dueAt: { type: 'string' },
              priority: { type: 'string', enum: ['low', 'medium', 'high', 'urgent'] },
              reason: { type: 'string' },
              evidence: { type: 'string' },
            },
            required: ['type', 'title', 'owner', 'dueAt', 'priority', 'reason', 'evidence'],
          },
        },
        alerts: {
          type: 'array',
          maxItems: 4,
          items: {
            type: 'object',
            additionalProperties: false,
            properties: {
              key: { type: 'string' },
              type: { type: 'string' },
              severity: { type: 'string', enum: ['low', 'medium', 'high', 'critical'] },
              title: { type: 'string' },
              detail: { type: 'string' },
              evidence: { type: 'string' },
              recommendedAction: { type: 'string' },
            },
            required: ['type', 'severity', 'title', 'detail', 'evidence', 'recommendedAction'],
          },
        },
      },
      required: ['reply', 'confidence', 'intent', 'reason', 'requiresHuman', 'profileUpdates', 'tasks', 'alerts'],
    };
  }

  sessionKey(context = {}) {
    return String(context.conversation?.id || context.conversation?.contact_id || 'qiwei-default');
  }

  buildPrompt(messages, context = {}) {
    return this.contextBuilder.buildClaudePrompt(messages, context);
  }

  runProcess(args, input = '') {
    if (!this.isConfigured()) throw new AgentNotConfiguredError();
    return new Promise((resolve, reject) => {
      const childEnv = { ...process.env, NO_COLOR: '1' };
      if (this.config.claudeBare !== false && childEnv.ANTHROPIC_AUTH_TOKEN) {
        childEnv.ANTHROPIC_API_KEY = childEnv.ANTHROPIC_AUTH_TOKEN;
      }
      const child = spawn(this.executable, args, {
        cwd: this.workdir,
        env: childEnv,
        windowsHide: true,
        stdio: ['pipe', 'pipe', 'pipe'],
      });
      let stdout = '';
      let stderr = '';
      let finished = false;
      const maxBuffer = 8 * 1024 * 1024;
      const timer = setTimeout(() => {
        if (finished) return;
        child.kill('SIGTERM');
        reject(new Error('Claude Code 处理超时，已转人工审核'));
      }, Number(this.config.claudeTimeoutMs || 120000));

      child.stdout.on('data', chunk => {
        stdout += chunk.toString('utf8');
        if (stdout.length > maxBuffer) child.kill('SIGTERM');
      });
      child.stderr.on('data', chunk => {
        stderr += chunk.toString('utf8');
        if (stderr.length > maxBuffer) child.kill('SIGTERM');
      });
      child.stdin.on('error', () => {});
      child.stdin.end(String(input || ''), 'utf8');
      child.once('error', error => {
        if (finished) return;
        finished = true;
        clearTimeout(timer);
        reject(error);
      });
      child.once('close', code => {
        if (finished) return;
        finished = true;
        clearTimeout(timer);
        const parsed = parseClaudeProcessResult(stdout, stderr, code);
        if (parsed.error) reject(new Error(parsed.error));
        else resolve(parsed.payload);
      });
    });
  }

  async invoke(messages, context, session, options = {}) {
    const system = messages.find(message => message.role === 'system')?.content || '';
    const businessPrompt = this.buildPrompt(messages, context);
    const prompt = `${system}\n\n${businessPrompt}`;
    const budgetLimitUsd = Number(options.maxBudgetUsd || this.config.claudeMaxBudgetUsd || 1);
    const args = [
      '--print',
      '--output-format', 'json',
      '--permission-mode', 'dontAsk',
      ...(this.config.claudeBare !== false ? ['--bare'] : []),
      ...(this.config.claudeEffort ? ['--effort', String(this.config.claudeEffort)] : []),
      '--tools', String(this.config.claudeTools || 'Read,Glob,Grep'),
      '--model', String(this.config.model || 'sonnet'),
      '--max-budget-usd', String(budgetLimitUsd),
      '--json-schema', JSON.stringify(this.outputSchema()),
      '--name', session.displayName || buildClaudeSessionName(context, this.sessionKey(context)),
    ];
    for (const dir of this.config.claudeAddDirs || []) {
      if (dir && fs.existsSync(dir)) args.push('--add-dir', path.resolve(dir));
    }
    if (session.initialized) args.push('--resume', session.id);
    else args.push('--session-id', session.id);

    const payload = await this.runProcess(args, prompt);
    if (payload.is_error) {
      const subtype = String(payload.subtype || 'unknown');
      const error = new Error(`Claude Code/Fmode 暂时不可用（${subtype}）`);
      error.subtype = subtype;
      throw error;
    }
    const structured = payload.structured_output ?? payload.result;
    if (structured === undefined || structured === null || structured === '') {
      throw new Error('Claude Code 没有返回客服草稿');
    }
    return {
      content: typeof structured === 'string' ? structured : JSON.stringify(structured),
      claudeCode: {
        model: this.config.model,
        sessionName: session.displayName || buildClaudeSessionName(context, this.sessionKey(context)),
        durationMs: Number(payload.duration_ms || 0),
        costUsd: Number(payload.total_cost_usd || 0),
        budgetLimitUsd,
        resumed: Boolean(session.initialized),
        systemChars: system.length,
        businessPromptChars: businessPrompt.length,
        promptChars: prompt.length,
        ...(payload.process_warning ? { processWarning: payload.process_warning } : {}),
      },
    };
  }

  async complete(messages, tools, context = {}) {
    const key = this.sessionKey(context);
    const metadata = {
      customerName: context.conversation?.contact_name || context.conversation?.displayName || '',
      displayName: buildClaudeSessionName(context, key),
      memoryVersion: Number(context.memoryContext?.snapshot?.version || 0),
    };
    const previous = this.queues.get(key) || Promise.resolve();
    const current = previous.catch(() => {}).then(async () => {
      const rotated = this.sessionStore.rotateIfNeeded(key, metadata, {
        maxTurns: this.config.claudeSessionMaxTurns,
        maxAgeMs: this.config.claudeSessionMaxAgeMs,
      });
      let session = rotated.session;
      try {
        const result = await this.invoke(messages, context, session);
        this.sessionStore.markInitialized(key, metadata);
        if (rotated.reason && result.claudeCode) result.claudeCode.sessionResetReason = rotated.reason;
        return result;
      } catch (error) {
        const resetReason = claudeSessionResetReason(error);
        if (resetReason) {
          session = this.sessionStore.reset(key, { ...metadata, parentSessionId: session.id, closedReason: resetReason });
          const retryMaxBudgetUsd = resetReason === 'budget_exceeded'
            ? Number(this.config.claudeRetryMaxBudgetUsd || Math.max(Number(this.config.claudeMaxBudgetUsd || 1) * 2, 3))
            : undefined;
          const result = await this.invoke(messages, context, session, { maxBudgetUsd: retryMaxBudgetUsd });
          this.sessionStore.markInitialized(key, metadata);
          if (result.claudeCode) result.claudeCode.sessionResetReason = resetReason;
          return result;
        }
        throw error;
      }
    });
    this.queues.set(key, current);
    try { return await current; }
    finally { if (this.queues.get(key) === current) this.queues.delete(key); }
  }
}

function parseJsonCandidate(value) {
  if (value && typeof value === 'object' && !Array.isArray(value)) return value;
  const text = String(value || '').trim();
  if (!text) return null;
  try {
    const parsed = JSON.parse(text);
    return parsed && typeof parsed === 'object' && !Array.isArray(parsed) ? parsed : null;
  } catch {}

  const fenced = [...text.matchAll(/```(?:json)?\s*([\s\S]*?)```/gi)];
  for (const match of fenced) {
    try {
      const parsed = JSON.parse(match[1].trim());
      if (parsed && typeof parsed === 'object' && !Array.isArray(parsed)) return parsed;
    } catch {}
  }

  for (let start = text.indexOf('{'); start >= 0; start = text.indexOf('{', start + 1)) {
    let depth = 0;
    let inString = false;
    let escaped = false;
    for (let index = start; index < text.length; index += 1) {
      const char = text[index];
      if (inString) {
        if (escaped) escaped = false;
        else if (char === '\\') escaped = true;
        else if (char === '"') inString = false;
        continue;
      }
      if (char === '"') inString = true;
      else if (char === '{') depth += 1;
      else if (char === '}') {
        depth -= 1;
        if (depth === 0) {
          try {
            const parsed = JSON.parse(text.slice(start, index + 1));
            if (parsed && typeof parsed === 'object' && !Array.isArray(parsed)) return parsed;
          } catch {}
          break;
        }
      }
    }
  }
  return null;
}

function parseFinal(content) {
  const text = String(content || '').trim();
  let parsed = parseJsonCandidate(text);
  for (let depth = 0; parsed && depth < 3; depth += 1) {
    const wrapped = !Object.prototype.hasOwnProperty.call(parsed, 'reply')
      ? parseJsonCandidate(parsed.structured_output) || parseJsonCandidate(parsed.result)
      : null;
    if (wrapped) {
      parsed = wrapped;
      continue;
    }
    const nestedReply = parseJsonCandidate(parsed.reply);
    if (!nestedReply || !Object.prototype.hasOwnProperty.call(nestedReply, 'reply')) break;
    parsed = { ...parsed, ...nestedReply };
  }
  if (parsed && Object.prototype.hasOwnProperty.call(parsed, 'reply')) return parsed;

  const looksStructured = /^\s*[\[{]/.test(text) || /```(?:json)?/i.test(text) || /["']reply["']\s*:/.test(text);
  return {
    reply: looksStructured ? '' : text,
    confidence: 0.5,
    intent: 'unknown',
    reason: looksStructured
      ? '模型返回的结构化结果无法安全解析，已阻止 JSON 进入客户回复'
      : '模型未返回结构化结果，必须人工审核',
    requiresHuman: true,
    profileUpdates: {},
  };
}

function clamp(value) { return Math.max(0, Math.min(1, Number(value) || 0)); }

class QiweiAgentRuntime {
  constructor({ config, knowledge, modelClient = null }) {
    this.config = config;
    this.knowledge = knowledge;
    this.contextBuilder = new AgentContextBuilder({ config, knowledge });
    this.modelClient = modelClient || (config.provider === 'claude-code'
      ? new ClaudeCodeClient(config, this.contextBuilder)
      : config.provider === 'anthropic'
        ? new AnthropicCompatibleClient(config)
        : new OpenAICompatibleClient(config));
  }

  tools() {
    return [
      {
        type: 'function',
        function: {
          name: 'search_knowledge',
          description: '检索企业规则、FAQ 和沟通 Playbook。',
          parameters: {
            type: 'object',
            properties: { query: { type: 'string' }, limit: { type: 'integer' } },
            required: ['query'],
          },
        },
      },
      {
        type: 'function',
        function: {
          name: 'get_customer_profile',
          description: '读取当前客户画像与标签。',
          parameters: { type: 'object', properties: {} },
        },
      },
    ];
  }

  async executeTool(name, args, context) {
    if (name === 'search_knowledge') return this.knowledge.search(args.query, args.limit || 5);
    if (name === 'get_customer_profile') return context.profile || { profile: {}, tags: [] };
    return { error: `未知工具 ${name}` };
  }

  async run({ conversation, messages, profile, customerIntelligence = {}, inboundContent, channelType = 'private', directPrompt = '', memoryContext = {} }) {
    const history = messages.slice(-16).map(message => ({
      role: message.direction === 'inbound' ? 'user' : 'assistant',
      content: message.content,
    }));
    const system = this.contextBuilder.buildSystemContext({ channelType, customerIntelligence, memoryContext });
    const llmMessages = [{ role: 'system', content: system }, ...history];
    const toolTrace = [];
    const citations = [];

    for (let round = 0; round < this.config.maxToolRounds; round += 1) {
      const assistant = await this.modelClient.complete(llmMessages, this.tools(), {
        conversation,
        profile,
        customerIntelligence,
        inboundContent,
        channelType,
        directPrompt,
        memoryContext,
      });
      if (assistant.claudeCode) {
        toolTrace.push({
          tool: 'claude_code_session',
          args: { provider: 'Fmode Studio', model: assistant.claudeCode.model },
          result: {
            sessionName: assistant.claudeCode.sessionName,
            durationMs: assistant.claudeCode.durationMs,
            costUsd: assistant.claudeCode.costUsd,
            budgetLimitUsd: assistant.claudeCode.budgetLimitUsd,
            resumed: assistant.claudeCode.resumed,
            systemChars: assistant.claudeCode.systemChars,
            businessPromptChars: assistant.claudeCode.businessPromptChars,
            promptChars: assistant.claudeCode.promptChars,
            ...(assistant.claudeCode.processWarning ? { processWarning: assistant.claudeCode.processWarning } : {}),
            ...(assistant.claudeCode.sessionResetReason ? { sessionResetReason: assistant.claudeCode.sessionResetReason } : {}),
          },
        });
      }
      if (assistant.tool_calls?.length) {
        llmMessages.push({ role: 'assistant', content: assistant.content || '', tool_calls: assistant.tool_calls });
        for (const call of assistant.tool_calls) {
          let args = {};
          try { args = JSON.parse(call.function.arguments || '{}'); } catch {}
          const result = await this.executeTool(call.function.name, args, { conversation, profile, customerIntelligence });
          toolTrace.push({ tool: call.function.name, args, result });
          if (call.function.name === 'search_knowledge') {
            for (const item of result) citations.push({ id: item.id, source: item.source, heading: item.heading });
          }
          llmMessages.push({ role: 'tool', tool_call_id: call.id, content: JSON.stringify(result) });
        }
        continue;
      }

      const parsedFinal = parseFinal(assistant.content);
      const authoritativeHistory = selectAuthoritativeHistory(history, 10);
      const currentProfile = profile?.profile || profile || {};
      const final = enforceAuthoritativeGrounding(parsedFinal, authoritativeHistory, currentProfile, inboundContent);
      const intelligence = extractExplicitCustomerIntelligence(inboundContent, currentProfile, final);
      const risky = RISK_PATTERN.test(inboundContent) || RISK_PATTERN.test(final.reply || '');
      const confidence = risky ? Math.min(clamp(final.confidence), 0.75) : clamp(final.confidence);
      return {
        content: String(final.reply || '').trim(),
        confidence,
        intent: String(final.intent || 'unknown'),
        reason: String(final.reason || 'Agent 未提供说明'),
        requiresHuman: Boolean(final.requiresHuman || risky || confidence < 0.7),
        profileUpdates: intelligence.profileUpdates,
        tasks: intelligence.tasks,
        alerts: intelligence.alerts,
        citations: [...new Map(citations.map(item => [item.id, item])).values()],
        toolTrace,
      };
    }
    throw new Error('Agent 工具调用轮次超过上限，已转人工处理');
  }
}

module.exports = {
  AgentNotConfiguredError,
  OpenAICompatibleClient,
  AnthropicCompatibleClient,
  ClaudeCodeClient,
  ClaudeCodeSessionStore,
  buildClaudeSessionName,
  claudeSessionResetReason,
  parseClaudeProcessResult,
  parseFinal,
  selectAuthoritativeHistory,
  enforceAuthoritativeGrounding,
  extractExplicitCustomerIntelligence,
  isNoReplyNeededMessage,
  resolveClaudeExecutable,
  QiweiAgentRuntime,
};