'use strict';

const test = require('node:test');
const assert = require('node:assert/strict');

const handler = require('./chat-stream');
const {
  createToolSieveState,
  processToolSieveChunk,
  flushToolSieve,
} = require('./helpers/stream-tool-sieve');

const { parseChunkForContent } = handler.__test;

test('chat-stream exposes parser test hooks', () => {
  assert.equal(typeof parseChunkForContent, 'function');
});

test('parseChunkForContent keeps split response/content fragments inside response array', () => {
  const chunk = {
    p: 'response',
    v: [
      { p: 'response/content', v: '{"' },
      { p: 'response/content', v: 'tool_calls":[{"name":"read_file","input":{"path":"README.MD"}}]}' },
    ],
  };
  const parsed = parseChunkForContent(chunk, false, 'text');
  assert.equal(parsed.finished, false);
  assert.equal(parsed.newType, 'text');
  assert.equal(parsed.parts.length, 2);
  const combined = parsed.parts.map((p) => p.text).join('');
  assert.equal(combined, '{"tool_calls":[{"name":"read_file","input":{"path":"README.MD"}}]}');
});

test('parseChunkForContent + sieve does not leak suspicious prefix in split tool json case', () => {
  const chunk = {
    p: 'response',
    v: [
      { p: 'response/content', v: '{"' },
      { p: 'response/content', v: 'tool_calls":[{"name":"read_file","input":{"path":"README.MD"}}]}' },
    ],
  };
  const parsed = parseChunkForContent(chunk, false, 'text');
  const state = createToolSieveState();
  const events = [];
  for (const part of parsed.parts) {
    events.push(...processToolSieveChunk(state, part.text, ['read_file']));
  }
  events.push(...flushToolSieve(state, ['read_file']));

  const hasToolCalls = events.some((evt) => evt.type === 'tool_calls' && evt.calls && evt.calls.length > 0);
  const leakedText = events
    .filter((evt) => evt.type === 'text' && evt.text)
    .map((evt) => evt.text)
    .join('');

  assert.equal(hasToolCalls, true);
  assert.equal(leakedText.includes('{'), false);
  assert.equal(leakedText.toLowerCase().includes('tool_calls'), false);
});

test('parseChunkForContent consumes nested item.v array payloads', () => {
  const chunk = {
    p: 'response',
    v: [
      { p: 'response/content', v: ['A', 'B'] },
      { p: 'response/content', v: [{ content: 'C', type: 'RESPONSE' }] },
    ],
  };
  const parsed = parseChunkForContent(chunk, false, 'text');
  assert.equal(parsed.finished, false);
  assert.equal(parsed.parts.map((p) => p.text).join(''), 'ABC');
});

test('parseChunkForContent detects nested status FINISHED in array payload', () => {
  const chunk = {
    p: 'response',
    v: [{ p: 'status', v: 'FINISHED' }],
  };
  const parsed = parseChunkForContent(chunk, false, 'text');
  assert.equal(parsed.finished, true);
  assert.deepEqual(parsed.parts, []);
});

test('parseChunkForContent ignores items without v to match Go parser behavior', () => {
  const chunk = {
    p: 'response',
    v: [{ type: 'RESPONSE', content: 'no-v-content' }],
  };
  const parsed = parseChunkForContent(chunk, false, 'text');
  assert.equal(parsed.finished, false);
  assert.deepEqual(parsed.parts, []);
});

test('parseChunkForContent handles response/fragments APPEND with thinking and response transitions', () => {
  const chunk = {
    p: 'response/fragments',
    o: 'APPEND',
    v: [
      { type: 'THINK', content: '思考中' },
      { type: 'RESPONSE', content: '结论' },
    ],
  };
  const parsed = parseChunkForContent(chunk, true, 'thinking');
  assert.equal(parsed.finished, false);
  assert.equal(parsed.newType, 'text');
  assert.deepEqual(parsed.parts, [
    { text: '思考中', type: 'thinking' },
    { text: '结论', type: 'text' },
  ]);
});

test('parseChunkForContent supports wrapped response.fragments object shape', () => {
  const chunk = {
    p: 'response',
    v: {
      response: {
        fragments: [
          { type: 'RESPONSE', content: 'A' },
          { type: 'RESPONSE', content: 'B' },
        ],
      },
    },
  };
  const parsed = parseChunkForContent(chunk, false, 'text');
  assert.equal(parsed.finished, false);
  assert.equal(parsed.parts.map((p) => p.text).join(''), 'AB');
});