import axios from 'axios'

const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || '/api'

const api = axios.create({
  baseURL: API_BASE_URL,
  timeout: 30000,
})

// Add authentication interceptor
api.interceptors.request.use(
  async (config) => {
    // Try to get token from either auth method
    const authToken = localStorage.getItem('authToken');
    const azureToken = localStorage.getItem('azureAuthToken');
    
    const token = authToken || azureToken;
    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    return config;
  },
  (error) => Promise.reject(error)
)

api.interceptors.response.use(
  (response) => response,
  (error) => {
    if (error.response?.status === 401) {
      // Token expired or invalid, clear all tokens and redirect to login
      localStorage.removeItem('authToken');
      localStorage.removeItem('azureAuthToken');
      localStorage.removeItem('currentUser');
      window.location.href = '/login';
    }
    console.error('API Error:', error.response?.data || error.message)
    return Promise.reject(error)
  }
)

export const agentsAPI = {
  async getAll(admin = false) {
    const params = admin ? { admin: 'true' } : {};
    
    // Add userId for permission filtering (unless admin request)
    if (!admin) {
      const currentUser = localStorage.getItem('currentUser');
      if (currentUser) {
        const user = JSON.parse(currentUser);
        params.userId = user.id;
      }
    }
    
    const response = await api.get('/assistants', { params })
    return response.data
  },
  
  async getByKey(key) {
    const response = await api.get(`/assistants/${key}`)
    return response.data
  },


  async update(key, data) {
    const response = await api.put(`/assistants/${key}`, data)
    return response.data
  },

  async toggleStatus(key) {
    const response = await api.patch(`/assistants/${key}/toggle-status`)
    return response.data
  },

  async create(data) {
    const response = await api.post('/assistants', data)
    return response.data
  },

  async delete(key) {
    const response = await api.delete(`/assistants/${key}`)
    return response.data
  }
}

// Keep old name for backward compatibility during migration
export const assistantsAPI = agentsAPI

export const chatAPI = {
  async sendMessage(data, files = []) {
    if (files && files.length > 0) {
      const formData = new FormData()
      
      // Add text data
      Object.keys(data).forEach(key => {
        if (key !== 'files') {
          formData.append(key, typeof data[key] === 'object' ? JSON.stringify(data[key]) : data[key])
        }
      })
      
      // Add files
      files.forEach(file => {
        formData.append('files', file)
      })
      
      const response = await api.post('/chat/completions', formData, {
        headers: {
          'Content-Type': 'multipart/form-data',
        }
      })
      return response.data
    } else {
      const response = await api.post('/chat/completions', data)
      return response.data
    }
  },
  
  async sendStreamingMessage(data, onChunk, files = []) {
    let requestBody
    let headers = {}
    
    if (files && files.length > 0) {
      const formData = new FormData()
      
      // Add text data
      Object.keys(data).forEach(key => {
        if (key !== 'files') {
          formData.append(key, typeof data[key] === 'object' ? JSON.stringify(data[key]) : data[key])
        }
      })
      formData.append('stream', 'true')
      
      // Add files
      files.forEach(file => {
        formData.append('files', file)
      })
      
      requestBody = formData
    } else {
      headers['Content-Type'] = 'application/json'
      requestBody = JSON.stringify({ ...data, stream: true })
    }

    const response = await fetch(`${API_BASE_URL}/chat/completions`, {
      method: 'POST',
      headers,
      body: requestBody
    })
    
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`)
    }
    
    const reader = response.body.getReader()
    const decoder = new TextDecoder()
    
    try {
      while (true) {
        const { done, value } = await reader.read()
        if (done) break
        
        const chunk = decoder.decode(value)
        const lines = chunk.split('\n')
        
        for (const line of lines) {
          if (line.startsWith('data: ')) {
            try {
              const data = JSON.parse(line.slice(6))
              if (onChunk) onChunk(data)
            } catch (e) {
              console.warn('Failed to parse SSE data:', line)
            }
          }
        }
      }
    } finally {
      reader.releaseLock()
    }
  },
  
  async getConversationMessages(conversationId, limit = 50, offset = 0) {
    const response = await api.get(`/chat/conversations/${conversationId}/messages`, {
      params: { limit, offset }
    })
    return response.data
  },

  async getConversations(userId, limit = 20, offset = 0) {
    const response = await api.get('/chat/conversations', {
      params: { userId, limit, offset }
    })
    return response.data
  }
}

export const analyticsAPI = {
  async getUsageData(filters = {}) {
    const params = {};
    if (filters.startDate) params.startDate = filters.startDate;
    if (filters.endDate) params.endDate = filters.endDate;
    if (filters.userId) params.userId = filters.userId;
    if (filters.agentKey) params.agentKey = filters.agentKey;
    
    const response = await api.get('/analytics/usage', { params });
    return response.data;
  },

  async getUsageStats(filters = {}) {
    const params = {};
    if (filters.startDate) params.startDate = filters.startDate;
    if (filters.endDate) params.endDate = filters.endDate;
    
    const response = await api.get('/analytics/stats', { params });
    return response.data;
  },

  async getTrends(days = 30) {
    const response = await api.get('/analytics/trends', { params: { days } });
    return response.data;
  },

  async getAgentTrends(days = 30) {
    const response = await api.get('/analytics/agent-trends', { params: { days } });
    return response.data;
  }
};

export const usersAPI = {
  async getAll() {
    const response = await api.get('/users');
    return response.data;
  },

  async getById(id) {
    const response = await api.get(`/users/${id}`);
    return response.data;
  },

  async update(id, userData) {
    const response = await api.put(`/users/${id}`, userData);
    return response.data;
  },

  async create(userData) {
    const response = await api.post('/users', userData);
    return response.data;
  },

  async delete(id) {
    const response = await api.delete(`/users/${id}`);
    return response.data;
  },

  async toggleStatus(id) {
    const response = await api.patch(`/users/${id}/toggle-status`);
    return response.data;
  }
};

export default api