import { simulateReadableStream } from 'ai';
import { MockLanguageModelV1 } from 'ai/test';
import { getResponseChunksByPrompt } from '@/tests/prompts/utils';

export const chatModel = new MockLanguageModelV1({
  doGenerate: async () => ({
    rawCall: { rawPrompt: null, rawSettings: {} },
    finishReason: 'stop',
    usage: { promptTokens: 10, completionTokens: 20 },
    text: `Hello, world!`,
  }),
  doStream: async ({ prompt }) => ({
    stream: simulateReadableStream({
      chunks: getResponseChunksByPrompt(prompt),
    }),
    rawCall: { rawPrompt: null, rawSettings: {} },
  }),
});

export const reasoningModel = new MockLanguageModelV1({
  doGenerate: async () => ({
    rawCall: { rawPrompt: null, rawSettings: {} },
    finishReason: 'stop',
    usage: { promptTokens: 10, completionTokens: 20 },
    text: `Hello, world!`,
  }),
  doStream: async ({ prompt }) => ({
    stream: simulateReadableStream({
      chunks: getResponseChunksByPrompt(prompt, true),
    }),
    rawCall: { rawPrompt: null, rawSettings: {} },
  }),
});

export const titleModel = new MockLanguageModelV1({
  doGenerate: async () => ({
    rawCall: { rawPrompt: null, rawSettings: {} },
    finishReason: 'stop',
    usage: { promptTokens: 10, completionTokens: 20 },
    text: `This is a test title`,
  }),
  doStream: async () => ({
    stream: simulateReadableStream({
      chunks: [
        { type: 'text-delta', textDelta: 'This is a test title' },
        {
          type: 'finish',
          finishReason: 'stop',
          logprobs: undefined,
          usage: { completionTokens: 10, promptTokens: 3 },
        },
      ],
    }),
    rawCall: { rawPrompt: null, rawSettings: {} },
  }),
});

export const artifactModel = new MockLanguageModelV1({
  doGenerate: async () => ({
    rawCall: { rawPrompt: null, rawSettings: {} },
    finishReason: 'stop',
    usage: { promptTokens: 10, completionTokens: 20 },
    text: `Hello, world!`,
  }),
  doStream: async ({ prompt }) => ({
    stream: simulateReadableStream({
      chunks: getResponseChunksByPrompt(prompt),
    }),
    rawCall: { rawPrompt: null, rawSettings: {} },
  }),
});