'use strict';

// node --test internal/vscodeext/ext/lib_test.js
// (VS Code's own runtime works too:
//  ELECTRON_RUN_AS_NODE=1 "/Applications/Visual Studio Code.app/Contents/MacOS/Electron" --test …)

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

// VS Code's parts, as the provider receives them: classes in VS Code,
// told apart here by their fields.
const text = (value) => ({ value });
const call = (callId, name, input) => ({ callId, name, input });
const result = (callId, ...values) => ({ callId, content: values.map(text) });

test('gatewayBase takes what people paste', () => {
  assert.equal(lib.gatewayBase('https://llm.example.com/'), 'https://llm.example.com');
  assert.equal(lib.gatewayBase('https://llm.example.com/v1'), 'https://llm.example.com');
  assert.equal(lib.gatewayBase('llm.example.com'), 'https://llm.example.com');
  assert.equal(lib.gatewayBase('http://10.0.0.140:8080/v1/'), 'http://10.0.0.140:8080');
  assert.equal(lib.gatewayBase('ftp://x'), '');
  assert.equal(lib.gatewayBase(''), '');
});

test('modelInfo keeps chat models and says what the catalog says', () => {
  const m = lib.modelInfo({
    id: 'coder', alias_of: 'qwen3-coder-30b', context_length: 32768, max_output_tokens: 8192,
    capabilities: { tools: true, vision: false },
  }, true);
  assert.equal(m.id, 'coder');
  assert.equal(m.family, 'qwen3-coder-30b');
  assert.equal(m.maxOutputTokens, 8192);
  assert.equal(m.maxInputTokens, 32768 - 8192);
  assert.deepEqual(m.capabilities, { toolCalling: true, imageInput: false });

  assert.equal(lib.modelInfo({ id: 'bge-m3', capabilities: { embeddings: true } }, true), null);
  assert.equal(lib.modelInfo({ id: 'flux', capabilities: { images: true } }, true), null);
  assert.equal(lib.modelInfo({ id: 'sf3d', capabilities: { meshes: true, workflows: true } }, true), null);
  assert.equal(lib.modelInfo({ id: 'plain', capabilities: {} }, false), null);

  const small = lib.modelInfo({ id: 'small', context_length: 4096, capabilities: {} }, true);
  assert.equal(small.maxOutputTokens, 1024, 'a quarter of a small context, not 4096 of it');
});

test('chatMessages puts tool calls and results where chat completions want them', () => {
  const msgs = lib.chatMessages([
    { role: lib.USER, content: [text('Read main.go')] },
    { role: lib.ASSISTANT, content: [text('Reading it.'), call('c1', 'read_file', { path: 'main.go' })] },
    { role: lib.USER, content: [result('c1', 'package main'), text('Now summarise it.')] },
  ], false);
  assert.deepEqual(msgs, [
    { role: 'user', content: 'Read main.go' },
    {
      role: 'assistant', content: 'Reading it.',
      tool_calls: [{ id: 'c1', type: 'function', function: { name: 'read_file', arguments: '{"path":"main.go"}' } }],
    },
    { role: 'tool', tool_call_id: 'c1', content: 'package main' },
    { role: 'user', content: 'Now summarise it.' },
  ]);
});

test('an assistant message of calls alone has null content', () => {
  const [m] = lib.chatMessages([{ role: lib.ASSISTANT, content: [call('c1', 'ls', {})] }], false);
  assert.equal(m.content, null);
  assert.equal(m.tool_calls.length, 1);
});

test('images go as data URLs only to a model that takes them', () => {
  const img = { mimeType: 'image/png', data: new Uint8Array([1, 2, 3]) };
  const [withVision] = lib.chatMessages([{ role: lib.USER, content: [text('what is this'), img] }], true);
  assert.deepEqual(withVision.content[1], { type: 'image_url', image_url: { url: 'data:image/png;base64,AQID' } });
  const [without] = lib.chatMessages([{ role: lib.USER, content: [text('what is this'), img] }], false);
  assert.equal(without.content, 'what is this');
});

test('requestBody asks for tools as functions, and requires one when VS Code does', () => {
  const model = { id: 'coder', maxOutputTokens: 2048, capabilities: { imageInput: false } };
  const body = lib.requestBody(model, [{ role: lib.USER, content: [text('hi')] }], {
    tools: [{ name: 'ls', description: 'list', inputSchema: undefined }], toolMode: 2, modelOptions: { temperature: 0.2 },
  });
  assert.equal(body.stream, true);
  assert.equal(body.max_tokens, 2048);
  assert.equal(body.tool_choice, 'required');
  assert.equal(body.temperature, 0.2);
  assert.deepEqual(body.tools[0].function.parameters, { type: 'object', properties: {} });
});

async function* chunks(...parts) {
  for (const p of parts) yield new TextEncoder().encode(p);
}

test('sseData reads events split anywhere', async () => {
  const got = [];
  for await (const d of lib.sseData(chunks('data: {"a":', '1}\r\n\ndata: [DO', 'NE]\n'))) got.push(d);
  assert.deepEqual(got, ['{"a":1}', '[DONE]']);
});

test('Answer joins text and tool-call arguments that arrive in pieces', () => {
  const a = new lib.Answer();
  const ev = (delta) => JSON.stringify({ choices: [{ delta }] });
  assert.equal(a.add(ev({ content: 'Hel' })), 'Hel');
  assert.equal(a.add(ev({ content: 'lo' })), 'lo');
  a.add(ev({ tool_calls: [{ index: 0, id: 'call_a', function: { name: 'read_file', arguments: '{"pa' } }] }));
  a.add(ev({ tool_calls: [{ index: 0, function: { arguments: 'th":"x"}' } }] }));
  a.add(ev({ tool_calls: [{ index: 1, id: 'call_b', function: { name: 'ls', arguments: '' } }] }));
  assert.equal(a.add('[DONE]'), '');
  assert.deepEqual(a.toolCalls(), [
    { id: 'call_a', name: 'read_file', input: { path: 'x' } },
    { id: 'call_b', name: 'ls', input: {} },
  ]);
});

test('Answer passes on an error the stream carries', () => {
  const a = new lib.Answer();
  assert.throws(() => a.add(JSON.stringify({ error: { message: 'budget spent' } })), /budget spent/);
});

test('errorMessage says what to do about a refused key', () => {
  assert.match(lib.errorMessage(401, '{"error":{"message":"invalid key"}}'), /Sign In/);
  assert.match(lib.errorMessage(429, '{"error":{"message":"rate limit"}}'), /rate limit/);
  assert.match(lib.errorMessage(500, 'boom'), /500: boom/);
});

test('a link to the same gateway by plain http is a downgrade', () => {
  assert.equal(lib.downgrades('https://llm.example.com', 'http://llm.example.com'), true);
  assert.equal(lib.downgrades('https://llm.example.com', 'https://llm.example.com'), false);
  assert.equal(lib.downgrades('http://llm.example.com', 'https://llm.example.com'), false);
  assert.equal(lib.downgrades('https://a.example.com', 'http://b.example.com'), false);
});