/**
 * Resume API Service
 * Handles all API calls to the backend for resume processing
 */

const APP_NAME = import.meta.env.VITE_APP_NAME || 'resumeformatter';
const API_BASE_URL = `/${APP_NAME}/api/resumes`;

export interface ConvertedFile {
  id: string;
  name: string;
  url: string;
  size: number;
  lastModified: string;
  timestamp: Date;
}

export interface ConvertResponse {
  success: boolean;
  html_url: string;
  html_content: string;
  message: string;
}

/**
 * Fetch list of available templates from R2
 */
export const fetchTemplates = async (): Promise<string[]> => {
  console.log('Fetching templates from API...');
  try {
    const response = await fetch(`${API_BASE_URL}/templates`);
    if (!response.ok) {
      throw new Error(`API error: ${response.status}`);
    }
    const data = await response.json();
    console.log('Templates loaded:', data);
    return data;
  } catch (error) {
    console.error('Error fetching templates:', error);
    throw error;
  }
};

/**
 * Fetch HTML content of a specific template
 */
export const fetchTemplateContent = async (templateName: string): Promise<string> => {
  console.log(`Fetching template content for: ${templateName}`);
  try {
    const response = await fetch(`${API_BASE_URL}/templates/${encodeURIComponent(templateName)}`);
    if (!response.ok) {
      throw new Error(`API error: ${response.status}`);
    }
    const data = await response.json();
    console.log('Template content loaded');
    return data.content;
  } catch (error) {
    console.error('Error fetching template content:', error);
    throw error;
  }
};

/**
 * Convert a resume file using the specified template
 */
export const convertResume = async (
  file: File,
  templateName: string,
  onProgress?: (message: string) => void
): Promise<ConvertResponse> => {
  console.log(`Converting resume: ${file.name} with template: ${templateName}`);
  
  try {
    // Create form data
    const formData = new FormData();
    formData.append('file', file);
    formData.append('template_name', templateName);
    
    onProgress?.('Uploading file to server...');
    
    // Send request
    const response = await fetch(`${API_BASE_URL}/convert`, {
      method: 'POST',
      body: formData,
    });
    
    if (!response.ok) {
      const errorData = await response.json().catch(() => ({ detail: 'Unknown error' }));
      throw new Error(errorData.detail || `API error: ${response.status}`);
    }
    
    onProgress?.('Processing complete!');
    
    const data = await response.json();
    console.log('Conversion complete:', data);
    return data;
  } catch (error) {
    console.error('Error converting resume:', error);
    throw error;
  }
};

/**
 * Fetch list of converted resumes from R2
 */
export const fetchConversionHistory = async (limit: number = 50): Promise<ConvertedFile[]> => {
  console.log('Fetching conversion history from API...');
  try {
    const response = await fetch(`${API_BASE_URL}/history?limit=${limit}`);
    if (!response.ok) {
      throw new Error(`API error: ${response.status}`);
    }
    const data = await response.json();
    
    // Transform data to match ConvertedFile interface
    const files: ConvertedFile[] = data.map((file: any) => ({
      id: file.id,
      name: file.name,
      url: file.url,
      size: file.size,
      lastModified: file.lastModified,
      timestamp: new Date(file.lastModified),
    }));
    
    console.log('Conversion history loaded:', files.length, 'files');
    return files;
  } catch (error) {
    console.error('Error fetching conversion history:', error);
    throw error;
  }
};

/**
 * Get download URL for a specific file
 */
export const getDownloadUrl = async (fileKey: string): Promise<string> => {
  console.log(`Getting download URL for: ${fileKey}`);
  try {
    const response = await fetch(`${API_BASE_URL}/download/${encodeURIComponent(fileKey)}`);
    if (!response.ok) {
      throw new Error(`API error: ${response.status}`);
    }
    const data = await response.json();
    console.log('Download URL retrieved');
    return data.url;
  } catch (error) {
    console.error('Error getting download URL:', error);
    throw error;
  }
};