# Mistral AI Migration Deep Dive - Implementation Details

## Provider-Agnostic Adapter Interface

```typescript
export interface AIAdapter {
  chat(messages: Message[], options?: ChatOptions): Promise<ChatResponse>;
  chatStream(messages: Message[], options?: ChatOptions): AsyncGenerator<string>;
  embed(text: string | string[]): Promise<number[][]>;
}
```

## OpenAI Adapter (Current)

```typescript
export class OpenAIAdapter implements AIAdapter {
  async chat(messages, options) {
    const response = await this.client.chat.completions.create({ model: options?.model || 'gpt-3.5-turbo', messages, temperature: options?.temperature });
    return { content: response.choices[0]?.message?.content || '', usage: { inputTokens: response.usage.prompt_tokens, outputTokens: response.usage.completion_tokens } };
  }
}
```

## Mistral Adapter (Target)

```typescript
export class MistralAdapter implements AIAdapter {
  async chat(messages, options) {
    const response = await this.client.chat.complete({ model: options?.model || 'mistral-small-latest', messages });
    return { content: response.choices?.[0]?.message?.content || '', usage: { inputTokens: response.usage?.promptTokens || 0, outputTokens: response.usage?.completionTokens || 0 } };
  }
}
```

## Feature Flag Controlled Migration

```typescript
export function createAIAdapter(): AIAdapter {
  const mistralPercentage = parseInt(process.env.MISTRAL_ROLLOUT_PERCENT || '0');
  return Math.random() * 100 < mistralPercentage ? new MistralAdapter() : new OpenAIAdapter();
}
```

## Model Mapping

```typescript
const MODEL_MAPPINGS = [
  { openai: 'gpt-3.5-turbo', mistral: 'mistral-small-latest', notes: 'Fast, cost-effective' },
  { openai: 'gpt-4', mistral: 'mistral-large-latest', notes: 'Complex reasoning' },
  { openai: 'text-embedding-ada-002', mistral: 'mistral-embed', notes: '1024 dimensions' },
];
```

## Gradual Rollout

```bash
Phase 1: MISTRAL_ROLLOUT_PERCENT=0   # Validation
Phase 2: MISTRAL_ROLLOUT_PERCENT=5   # Canary
Phase 3: MISTRAL_ROLLOUT_PERCENT=25  # Monitor 24-48h
Phase 4: MISTRAL_ROLLOUT_PERCENT=50  # Monitor 24-48h
Phase 5: MISTRAL_ROLLOUT_PERCENT=100 # Full migration
```

## Validation & Testing

```typescript
describe('Migration Validation', () => {
  for (const testCase of testCases) {
    it(`should produce similar output: ${testCase.name}`, async () => {
      const [openaiResult, mistralResult] = await Promise.all([
        openai.chat(testCase.messages, { temperature: 0 }),
        mistral.chat(testCase.messages, { temperature: 0 }),
      ]);
      expect(openaiResult.content.length).toBeGreaterThan(0);
      expect(mistralResult.content.length).toBeGreaterThan(0);
    });
  }
});
```

## Rollback

```bash
kubectl set env deployment/ai-service MISTRAL_ROLLOUT_PERCENT=0
kubectl rollout status deployment/ai-service
```

---
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