import axios, { AxiosResponse } from 'axios';

export async function storeData(
  servers: string[],
  key: string,
  value: Blob,
  ttl: number | null
): Promise<AxiosResponse | null> {
  for (const server of servers) {
    try {
      // Handle relative paths (for development proxy) vs absolute URLs (for production)
      let url: string;
      if (server.startsWith('/')) {
        // Relative path - construct manually for proxy
        url = `${server}/store/${encodeURIComponent(key)}`;
        if (ttl !== null) {
          url += `?ttl=${ttl}`;
        }
      } else {
        // Absolute URL - use URL constructor
        const urlObj = new URL(`${server}/store/${encodeURIComponent(key)}`);
        if (ttl !== null) {
          urlObj.searchParams.append('ttl', ttl.toString());
        }
        url = urlObj.toString();
      }

      // Test first that data is not already stored
      const testResponse = await testData(url, key);
      if (testResponse) {
        console.log('Data already stored:', key);
        continue;
      } else {
        console.log('Data not stored for server:', key, server);
      }

      // Send the encrypted ArrayBuffer as the raw request body.
      const response = await axios.post(url, value, {
        headers: {
          'Content-Type': 'application/octet-stream',
        },
      });
      console.log('Data stored successfully:', key);
      if (response.status !== 200) {
        console.error('Received response status', response.status);
        continue;
      }
      return response;
    } catch (error) {
      if (axios.isAxiosError(error) && error.response?.status === 409) {
        return null;
      }
      console.error('Error storing data:', error);
    }
  }
  return null;
}

export async function retrieveData(servers: string[], key: string): Promise<ArrayBuffer | null> {
  for (const server of servers) {
    try {
      // Handle relative paths (for development proxy) vs absolute URLs (for production)
      const url = server.startsWith('/')
        ? `${server}/retrieve/${key}` // Relative path - use as-is for proxy
        : new URL(`${server}/retrieve/${key}`).toString(); // Absolute URL - construct properly

      console.log('Retrieving data', key, ' from:', url);
      // When fetching the data from the server:
      const response = await axios.get(url, {
        responseType: 'arraybuffer',
      });

      if (response.status === 200) {
        // Validate that we received an ArrayBuffer
        if (response.data instanceof ArrayBuffer) {
          return response.data;
        } else {
          console.error('Server returned non-ArrayBuffer data:', typeof response.data);
          continue;
        }
      } else {
        console.error(`Server ${server} returned status ${response.status}`);
        continue;
      }
    } catch (error) {
      if (axios.isAxiosError(error)) {
        if (error.response?.status === 404) {
          console.log(`Data not found on server ${server} for key ${key}`);
          continue; // Try next server
        } else if (error.response?.status) {
          console.error(
            `Server ${server} error ${error.response.status}:`,
            error.response.statusText
          );
          continue;
        } else {
          console.error(`Network error connecting to ${server}:`, (error as Error).message);
          continue;
        }
      } else {
        console.error(`Unexpected error retrieving data from ${server}:`, error);
        continue;
      }
    }
  }
  return null;
}

export async function testData(url: string, _key: string): Promise<boolean | null> {
  try {
    const response = await axios.get(url);
    if (response.status !== 200) {
      console.error(`Test response status: ${response.status}`);
      return false;
    }

    return true;
  } catch (error) {
    console.error('Error testing data:', error);
    return null;
  }
}