import assert from 'node:assert/strict';
import test from 'node:test';
import {
  createDirectChatService,
  isDirectChatSessionId,
  isPortalDirectChatSnapshot,
  sendDirectChatSessionEvents,
  shouldExpirePortalDirectChatSnapshot,
} from './direct-chat-service.mjs';

test('direct chat is enabled by default', () => {
  const service = createDirectChatService({
    userAuth: {},
    llmProviderService: {},
    sessionSnapshotService: {},
  });
  assert.equal(service.getStatus().enabled, true);
  assert.equal(service.canHandle({
    userMessage: { role: 'user', content: [{ type: 'text', text: 'hi' }] },
    routingDecision: 'direct_chat',
  }), true);
});

test('direct chat registers session through sessionAccess when provided', async () => {
  const registered = [];
  const service = createDirectChatService({
    enabled: true,
    userAuth: {},
    sessionAccess: {
      enabled: true,
      async registerAgentSession(userId, sessionId, target) {
        registered.push({ userId, sessionId, target });
      },
    },
    llmProviderService: {
      async createChatCompletion() {
        return {
          ok: true,
          providerId: 'custom_deepseek',
          model: 'deepseek-chat',
          reply: 'ok',
          usage: { inputTokens: 1, outputTokens: 1 },
        };
      },
    },
    sessionSnapshotService: {
      async get() {
        return null;
      },
      async save() {},
    },
  });

  const result = await service.run({
    userId: 'user-1',
    requestId: 'req-access',
    userMessage: {
      role: 'user',
      content: [{ type: 'text', text: 'hi' }],
      metadata: { userVisible: true },
    },
  });

  assert.equal(registered.length, 1);
  assert.equal(registered[0].target, 'h5-direct');
  assert.equal(isDirectChatSessionId(result.sessionId), true);
});

test('direct chat creates a direct session, saves snapshot, and bills returned usage', async () => {
  const registered = [];
  const saved = [];
  const billed = [];
  const llmMessages = [];
  const service = createDirectChatService({
    enabled: true,
    userAuth: {
      async registerAgentSession(userId, sessionId, target) {
        registered.push({ userId, sessionId, target });
      },
      async getBillingState() {
        return { lastInputTokens: 10, lastOutputTokens: 5 };
      },
      async billSessionUsage(userId, sessionId, tokenState, requestId) {
        billed.push({ userId, sessionId, tokenState, requestId });
        return { ok: true, costCents: 1 };
      },
    },
    llmProviderService: {
      async createChatCompletion({ messages }) {
        llmMessages.push(messages);
        return {
          ok: true,
          providerId: 'custom_deepseek',
          model: 'deepseek-chat',
          reply: '你好，已收到。',
          usage: { inputTokens: 3, outputTokens: 4 },
        };
      },
    },
    sessionSnapshotService: {
      async get() {
        return null;
      },
      async save(sessionId, userId, session, messages) {
        saved.push({ sessionId, userId, session, messages });
      },
    },
    memoryV2: {
      async resolve() {
        return { memories: [{ label: 'preference', text: '喜欢简洁回答' }] };
      },
    },
  });

  const result = await service.run({
    userId: 'user-1',
    requestId: 'req-1',
    userMessage: {
      id: 'msg-user-1',
      role: 'user',
      content: [{ type: 'text', text: '打个招呼' }],
      metadata: { userVisible: true },
    },
  });

  assert.equal(result.ok, true);
  assert.equal(isDirectChatSessionId(result.sessionId), true);
  assert.deepEqual(registered, [
    { userId: 'user-1', sessionId: result.sessionId, target: 'h5-direct' },
  ]);
  assert.equal(saved.length, 2);
  assert.equal(saved[1].messages.length, 2);
  assert.equal(saved[1].messages[1].content[0].text, '你好，已收到。');
  assert.match(llmMessages[0][0].content, /喜欢简洁回答/);
  assert.deepEqual(billed, [{
    userId: 'user-1',
    sessionId: result.sessionId,
    tokenState: {
      accumulatedInputTokens: 13,
      accumulatedOutputTokens: 9,
    },
    requestId: 'req-1',
  }]);
});

test('direct chat run can be replayed through finite session events', async () => {
  const snapshots = new Map();
  const service = createDirectChatService({
    enabled: true,
    userAuth: {
      async registerAgentSession() {},
      async getBillingState() {
        return null;
      },
      async billSessionUsage() {
        return null;
      },
    },
    llmProviderService: {
      async createChatCompletion() {
        return {
          ok: true,
          reply: '这是直连回复。',
          usage: null,
        };
      },
    },
    sessionSnapshotService: {
      async get(sessionId) {
        return snapshots.get(sessionId) ?? null;
      },
      async save(sessionId, userId, session, messages) {
        snapshots.set(sessionId, { session, messages, userId });
      },
    },
  });

  const result = await service.run({
    userId: 'user-1',
    requestId: 'req-e2e',
    userMessage: {
      id: 'user-e2e',
      role: 'user',
      content: [{ type: 'text', text: '讲个程序员笑话' }],
      metadata: { userVisible: true },
    },
  });
  const snapshot = snapshots.get(result.sessionId);
  const res = {
    statusCode: 200,
    headers: {},
    chunks: [],
    ended: false,
    writableEnded: false,
    status(code) {
      this.statusCode = code;
      return this;
    },
    setHeader(key, value) {
      this.headers[key] = value;
    },
    write(chunk) {
      this.chunks.push(chunk);
    },
    end() {
      this.ended = true;
      this.writableEnded = true;
    },
  };

  sendDirectChatSessionEvents({ once() {} }, res, snapshot);

  const stream = res.chunks.join('');
  assert.equal(res.ended, true);
  assert.equal(res.headers['Content-Type'], 'text/event-stream; charset=utf-8');
  assert.match(stream, /"type":"UpdateConversation"/);
  assert.match(stream, /"type":"Finish"/);
  assert.match(stream, /这是直连回复。/);
});

test('direct chat rejects non-text messages', () => {
  const service = createDirectChatService({
    enabled: true,
    userAuth: {},
    llmProviderService: {},
    sessionSnapshotService: {},
  });
  assert.equal(service.canHandle({
    userMessage: {
      role: 'user',
      content: [{ type: 'image_url', image_url: { url: 'x' } }],
    },
  }), false);
});

test('direct chat rejects page generation tasks so the execution backend can handle them', () => {
  const service = createDirectChatService({
    enabled: true,
    userAuth: {},
    llmProviderService: {},
    sessionSnapshotService: {},
  });

  assert.equal(service.canHandle({
    toolMode: 'chat',
    userMessage: {
      role: 'user',
      content: [{ type: 'text', text: '帮我生成一个秋夜诗页面 public/autumn-night-poem.html' }],
    },
  }), false);
});

test('direct chat rejects themed article page tasks without explicit html path', () => {
  const service = createDirectChatService({
    enabled: true,
    userAuth: {},
    llmProviderService: {},
    sessionSnapshotService: {},
  });

  assert.equal(service.canHandle({
    toolMode: 'chat',
    userMessage: {
      role: 'user',
      content: [{ type: 'text', text: '帮我写个主题文章' }],
    },
  }), false);
  assert.equal(service.explainCanHandle({
    toolMode: 'chat',
    userMessage: {
      role: 'user',
      content: [{ type: 'text', text: '帮我写个主题文章' }],
    },
  }).reason, 'task_execution_required');
});

test('direct chat allows llm-routed replies on regular agent sessions', () => {
  const service = createDirectChatService({
    enabled: true,
    userAuth: {},
    llmProviderService: {},
    sessionSnapshotService: {},
  });
  const userMessage = {
    role: 'user',
    content: [{ type: 'text', text: '我想对太湖有更多的了解' }],
    metadata: { displayText: '我想对太湖有更多的了解' },
  };
  assert.equal(service.canHandle({
    sessionId: '20260704_11',
    routingDecision: 'direct_chat',
    userMessage,
  }), true);
  assert.equal(service.explainCanHandle({
    sessionId: '20260704_11',
    routingDecision: 'direct_chat',
    userMessage,
  }).reason, null);
});

test('direct chat run saves portal reply into an existing agent session', async () => {
  const saved = [];
  const service = createDirectChatService({
    enabled: true,
    userAuth: {
      async getBillingState() {
        return null;
      },
      async billSessionUsage() {
        return null;
      },
    },
    llmProviderService: {
      async createChatCompletion() {
        return {
          ok: true,
          model: 'deepseek-chat',
          reply: '太湖是中国第三大淡水湖。',
          usage: null,
        };
      },
    },
    sessionSnapshotService: {
      async get(sessionId) {
        return {
          session: { id: sessionId, name: 'New Chat', updated_at: '2026-07-04T00:00:00.000Z' },
          messages: [{
            id: 'user-1',
            role: 'user',
            content: [{ type: 'text', text: 'hi' }],
            metadata: { userVisible: true },
          }],
        };
      },
      async save(sessionId, userId, session, messages) {
        saved.push({ sessionId, userId, session, messages });
      },
    },
  });

  const result = await service.run({
    userId: 'user-1',
    sessionId: '20260704_11',
    requestId: 'req-taihu',
    routingDecision: 'direct_chat',
    userMessage: {
      id: 'user-taihu',
      role: 'user',
      content: [{ type: 'text', text: '我想对太湖有更多的了解' }],
      metadata: { displayText: '我想对太湖有更多的了解', userVisible: true },
    },
  });

  assert.equal(result.sessionId, '20260704_11');
  assert.equal(saved.length, 2);
  assert.equal(saved[1].messages.at(-1)?.metadata?.source, 'portal-direct-chat');
  assert.match(saved[1].messages.at(-1)?.content?.[0]?.text ?? '', /太湖/);
});

test('portal direct chat snapshot replay stays enabled for dedicated h5direct sessions', () => {
  const now = new Date().toISOString();
  const snapshot = {
    session: { updated_at: now },
    messages: [
      { role: 'user', content: [{ type: 'text', text: 'hi' }] },
      {
        role: 'assistant',
        metadata: { source: 'portal-direct-chat' },
        content: [{ type: 'text', text: '你好' }],
      },
    ],
  };
  assert.equal(
    isPortalDirectChatSnapshot(snapshot, { sessionId: 'h5direct_abc' }),
    true,
  );
});

test('portal direct chat snapshot is disabled after agent escalation on regular sessions', () => {
  const now = new Date().toISOString();
  const snapshot = {
    session: { updated_at: now },
    messages: [
      { role: 'user', content: [{ type: 'text', text: 'hi' }] },
      {
        role: 'assistant',
        metadata: { source: 'portal-direct-chat' },
        content: [{ type: 'text', text: '你好' }],
      },
      {
        role: 'user',
        content: [{ type: 'text', text: '帮我写一个 200 字散文，做成页面' }],
      },
    ],
  };
  assert.equal(
    isPortalDirectChatSnapshot(snapshot, { sessionId: '20260704_31' }),
    false,
  );
});

test('portal direct chat snapshot still replays a completed direct turn on regular sessions', () => {
  const now = new Date().toISOString();
  const snapshot = {
    session: { updated_at: now },
    messages: [
      { role: 'user', content: [{ type: 'text', text: '我想对太湖有更多的了解' }] },
      {
        role: 'assistant',
        metadata: { source: 'portal-direct-chat' },
        content: [{ type: 'text', text: '太湖是中国第三大淡水湖。' }],
      },
    ],
  };
  assert.equal(
    isPortalDirectChatSnapshot(snapshot, { sessionId: '20260704_11' }),
    true,
  );
});

test('shouldExpirePortalDirectChatSnapshot detects agent runs after a portal direct turn', async () => {
  const now = new Date().toISOString();
  const snapshot = {
    session: { updated_at: now },
    meta: { synced_at: 1000 },
    messages: [
      { role: 'user', content: [{ type: 'text', text: 'hi' }] },
      {
        role: 'assistant',
        metadata: { source: 'portal-direct-chat' },
        content: [{ type: 'text', text: '你好' }],
      },
    ],
  };
  const pool = {
    async query(_sql, params) {
      assert.deepEqual(params, ['20260704_31', 1000]);
      return [[{ id: 'agent-run-1' }]];
    },
  };
  assert.equal(
    await shouldExpirePortalDirectChatSnapshot(pool, '20260704_31', snapshot),
    true,
  );
});

test('shouldExpirePortalDirectChatSnapshot keeps pure direct chat sessions fast', async () => {
  const now = new Date().toISOString();
  const snapshot = {
    session: { updated_at: now },
    meta: { synced_at: 1000 },
    messages: [
      { role: 'user', content: [{ type: 'text', text: '太湖' }] },
      {
        role: 'assistant',
        metadata: { source: 'portal-direct-chat' },
        content: [{ type: 'text', text: '太湖是中国第三大淡水湖。' }],
      },
    ],
  };
  const pool = {
    async query() {
      return [[]];
    },
  };
  assert.equal(
    await shouldExpirePortalDirectChatSnapshot(pool, '20260704_11', snapshot),
    false,
  );
});