import { PROVIDERS, type AIProvider } from '../types/providers';
import { OLLAMA_AUTO_DETECT_URLS } from '../types/providers';

export interface ModelInfo {
  id: string;
  name: string;
}

interface TestResult {
  success: boolean;
  models?: ModelInfo[];
  error?: string;
  endpoint?: string;
}

export const testApiKey = async (provider: AIProvider, apiKey: string, endpoint?: string): Promise<TestResult> => {
  try {
    switch (provider) {
      case 'gemini':
        return await testGemini(apiKey);
      case 'openai':
        return await testOpenAI(apiKey);
      case 'anthropic':
        return await testAnthropic(apiKey);
      case 'azure':
        return await testAzure(apiKey, endpoint);
      case 'ollama':
        return await testOllama(endpoint);
      default:
        return { success: false, error: 'Provedor não suportado' };
    }
  } catch (error) {
    return { 
      success: false, 
      error: error instanceof Error ? error.message : 'Erro desconhecido ao testar API' 
    };
  }
};

const findOllamaEndpoint = async (): Promise<string | null> => {
  for (const url of OLLAMA_AUTO_DETECT_URLS) {
    try {
      const response = await fetch(`${url}/api/tags`, { 
        method: 'GET',
        signal: AbortSignal.timeout(3000)
      });
      if (response.ok) {
        return url;
      }
    } catch {
      continue;
    }
  }
  return null;
};

const testOllama = async (endpoint?: string): Promise<TestResult> => {
  let ollamaEndpoint = endpoint;
  
  if (!ollamaEndpoint) {
    const foundEndpoint = await findOllamaEndpoint();
    if (foundEndpoint) {
      ollamaEndpoint = foundEndpoint;
    } else {
      return { success: false, error: 'Ollama não encontrado. Configure o endereço manualmente.' };
    }
  }
  
  // Normalize endpoint - add /api for OpenWebUI
  const useOpenWebUI = ollamaEndpoint.includes('llm.reifonas.cloud');
  const apiEndpoint = useOpenWebUI ? `${ollamaEndpoint}/api` : ollamaEndpoint;
  
  try {
    const response = await fetch(`${apiEndpoint}/tags`);
    
    if (!response.ok) {
      return { success: false, error: 'Não foi possível conectar ao Ollama. Verifique o endereço.' };
    }
    
    const data = await response.json();
    const models = data.models?.map((m: any) => ({ 
      id: m.name, 
      name: m.name 
    })) || [];
    
    const visionModels = models.filter((m: ModelInfo) => 
      m.id.includes('vision') || 
      m.id.includes('llama3') || 
      m.id.includes('qwen2') ||
      m.id.includes('moondream')
    );

    if (visionModels.length > 0) {
      return { success: true, models: visionModels, endpoint: ollamaEndpoint };
    }
    
    return { 
      success: true, 
      models: models.length > 0 ? models : [{ id: 'llama3.2', name: 'Llama 3.2 (Padrão)' }],
      endpoint: ollamaEndpoint
    };
  } catch (error: any) {
    return { success: false, error: 'Não foi possível conectar ao Ollama. Verifique o endereço e certifique-se que o Ollama está rodando.' };
  }
};

const testGemini = async (apiKey: string): Promise<TestResult> => {
  const { GoogleGenAI } = await import('@google/genai');
  
  try {
    const ai = new GoogleGenAI({ apiKey });
    const response = await ai.models.generateContent({
      model: 'gemini-2.5-flash',
      contents: 'Respond with exactly: {"status": "ok"}',
      config: { temperature: 0 }
    });
    
    if (response.text && response.text.includes('ok')) {
      return {
        success: true,
        models: [
          { id: 'gemini-2.0-flash', name: 'Gemini 2.0 Flash (Rápido)' },
          { id: 'gemini-2.5-flash', name: 'Gemini 2.5 Flash (Equilibrado)' },
          { id: 'gemini-2.5-pro', name: 'Gemini 2.5 Pro (Mais potente)' }
        ]
      };
    }
    return { success: false, error: 'Resposta inválida do Gemini' };
  } catch (error: any) {
    if (error.message?.includes('API key')) {
      return { success: false, error: 'Chave de API inválida' };
    }
    throw error;
  }
};

const testOpenAI = async (apiKey: string): Promise<TestResult> => {
  try {
    const response = await fetch('https://api.openai.com/v1/models', {
      headers: { 'Authorization': `Bearer ${apiKey}` }
    });
    
    if (!response.ok) {
      const error = await response.json();
      return { success: false, error: error.error?.message || 'Chave de API inválida' };
    }
    
    const data = await response.json();
    const visionModels = data.data
      .filter((m: any) => m.id.includes('gpt-4o') || m.id.includes('gpt-4') || m.id.includes('gpt-4-turbo'))
      .map((m: any) => ({ id: m.id, name: m.id }));
    
    if (visionModels.length === 0) {
      return { 
        success: true, 
        models: [{ id: 'gpt-4o', name: 'GPT-4o (Padrão)' }]
      };
    }
    
    return { success: true, models: visionModels };
  } catch (error: any) {
    return { success: false, error: error.message || 'Erro ao conectar com OpenAI' };
  }
};

const testAnthropic = async (apiKey: string): Promise<TestResult> => {
  try {
    const response = await fetch('https://api.anthropic.com/v1/messages', {
      method: 'POST',
      headers: {
        'x-api-key': apiKey,
        'anthropic-version': '2023-06-01',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        model: 'claude-3-haiku-20240307',
        max_tokens: 10,
        messages: [{ role: 'user', content: 'Hi' }]
      })
    });
    
    if (!response.ok) {
      const error = await response.json();
      return { success: false, error: error.error?.message || 'Chave de API inválida' };
    }
    
    return {
      success: true,
      models: [
        { id: 'claude-3-opus-20240229', name: 'Claude 3 Opus (Mais potente)' },
        { id: 'claude-3-sonnet-20240229', name: 'Claude 3 Sonnet (Equilibrado)' },
        { id: 'claude-3-haiku-20240307', name: 'Claude 3 Haiku (Rápido)' }
      ]
    };
  } catch (error: any) {
    return { success: false, error: error.message || 'Erro ao conectar com Anthropic' };
  }
};

const testAzure = async (apiKey: string, endpoint: string): Promise<TestResult> => {
  if (!endpoint) {
    return { success: false, error: 'Endpoint do Azure é obrigatório' };
  }
  
  try {
    const url = `${endpoint}/openai/deployments?api-version=2024-02-15-preview`;
    const response = await fetch(url, {
      headers: { 'api-key': apiKey }
    });
    
    if (!response.ok) {
      return { success: false, error: 'Endpoint ou chave inválidos' };
    }
    
    const data = await response.json();
    const deployments = data.data?.map((d: any) => ({ 
      id: d.id, 
      name: d.id 
    })) || [];
    
    if (deployments.length === 0) {
      return { 
        success: true, 
        models: [{ id: 'gpt-4', name: 'GPT-4 (Padrão)' }] 
      };
    }
    
    return { success: true, models: deployments };
  } catch (error: any) {
    return { success: false, error: error.message || 'Erro ao conectar com Azure' };
  }
};