import dotenv from 'dotenv';

dotenv.config();

const SUPABASE_URL = (process.env.SUPABASE_URL || '').replace(/\/$/, '');
const SUPABASE_SERVICE_KEY = process.env.SUPABASE_SERVICE_KEY || '';

interface ParsedImage {
  fileBytes: Buffer;
  mimeType: string;
}

export const parseBase64Image = (base64Str: string): ParsedImage => {
  if (base64Str.includes(',')) {
    const [header, data] = base64Str.split(',', 2);
    let mimeType = 'image/jpeg';
    
    if (header.includes('data:')) {
      const parts = header.split(';');
      if (parts.length > 0) {
        mimeType = parts[0].replace('data:', '');
      }
      
      let fileBytes: Buffer;
      if (header.includes('base64')) {
        fileBytes = Buffer.from(data, 'base64');
      } else {
        const decodedStr = decodeURIComponent(data);
        fileBytes = Buffer.from(decodedStr, 'utf-8');
      }
      return { fileBytes, mimeType };
    }
    const fileBytes = Buffer.from(data, 'base64');
    return { fileBytes, mimeType };
  } else {
    const fileBytes = Buffer.from(base64Str, 'base64');
    return { fileBytes, mimeType: 'image/jpeg' };
  }
};

export const uploadBase64ToSupabase = async (
  bucket: string,
  filePath: string,
  base64Str: string
): Promise<string | null> => {
  try {
    const { fileBytes, mimeType } = parseBase64Image(base64Str);
    const uploadUrl = `${SUPABASE_URL}/storage/v1/object/${bucket}/${filePath}`;
    
    const response = await fetch(uploadUrl, {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${SUPABASE_SERVICE_KEY}`,
        'Content-Type': mimeType,
        'x-upsert': 'true'
      },
      body: fileBytes
    });

    if (response.ok) {
      return `${SUPABASE_URL}/storage/v1/object/public/${bucket}/${filePath}`;
    } else {
      const errorText = await response.text();
      console.error(`Supabase upload failed: ${response.status} - ${errorText}`);
      return null;
    }
  } catch (error) {
    console.error('Error uploading to Supabase:', error);
    return null;
  }
};

export const uploadBufferToSupabase = async (
  bucket: string,
  filePath: string,
  fileBuffer: Buffer,
  mimeType: string
): Promise<string | null> => {
  try {
    const uploadUrl = `${SUPABASE_URL}/storage/v1/object/${bucket}/${filePath}`;
    
    const response = await fetch(uploadUrl, {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${SUPABASE_SERVICE_KEY}`,
        'Content-Type': mimeType,
        'x-upsert': 'true'
      },
      body: fileBuffer
    });

    if (response.ok) {
      return `${SUPABASE_URL}/storage/v1/object/public/${bucket}/${filePath}`;
    } else {
      const errorText = await response.text();
      console.error(`Supabase upload failed: ${response.status} - ${errorText}`);
      return null;
    }
  } catch (error) {
    console.error('Error uploading buffer to Supabase:', error);
    return null;
  }
};

export const deleteFromSupabase = async (
  bucket: string,
  filePath: string
): Promise<boolean> => {
  try {
    const deleteUrl = `${SUPABASE_URL}/storage/v1/object/${bucket}/${filePath}`;
    const response = await fetch(deleteUrl, {
      method: 'DELETE',
      headers: {
        'Authorization': `Bearer ${SUPABASE_SERVICE_KEY}`
      }
    });
    return response.ok;
  } catch (error) {
    console.error('Error deleting from Supabase:', error);
    return false;
  }
};