import { NextRequest, NextResponse } from 'next/server';

interface BulkImportRequest {
  urls: string[];
}

interface ImportResult {
  url: string;
  status: 'imported' | 'skipped' | 'error';
  reason?: string;
  title?: string;
  author?: string;
  error?: string;
  storyId?: string;
}

interface BulkImportResponse {
  results: ImportResult[];
  summary: {
    total: number;
    imported: number;
    skipped: number;
    errors: number;
  };
}

export async function POST(request: NextRequest) {
  try {
    // Check for authentication
    const authorization = request.headers.get('authorization');
    if (!authorization) {
      return NextResponse.json(
        { error: 'Authentication required for bulk import' },
        { status: 401 }
      );
    }

    const body = await request.json();
    const { urls } = body as BulkImportRequest;

    if (!urls || !Array.isArray(urls) || urls.length === 0) {
      return NextResponse.json(
        { error: 'URLs array is required and must not be empty' },
        { status: 400 }
      );
    }

    if (urls.length > 50) {
      return NextResponse.json(
        { error: 'Maximum 50 URLs allowed per bulk import' },
        { status: 400 }
      );
    }

    // Dynamic imports to prevent client-side bundling
    const { StoryScraper } = await import('@/lib/scraper/scraper');
    
    const scraper = new StoryScraper();
    const results: ImportResult[] = [];
    let importedCount = 0;
    let skippedCount = 0;
    let errorCount = 0;

    console.log(`Starting bulk scraping for ${urls.length} URLs`);
    console.log(`Environment NEXT_PUBLIC_API_URL: ${process.env.NEXT_PUBLIC_API_URL}`);
    
    // For server-side API calls in Docker, use direct backend container URL
    // Client-side calls use NEXT_PUBLIC_API_URL through nginx, but server-side needs direct container access
    const serverSideApiBaseUrl = 'http://backend:8080/api';
    console.log(`DEBUG: serverSideApiBaseUrl variable is: ${serverSideApiBaseUrl}`);
    
    // Quick test to verify backend connectivity
    try {
      console.log(`Testing backend connectivity at: http://backend:8080/api/stories/check-duplicate`);
      const testResponse = await fetch(`http://backend:8080/api/stories/check-duplicate?title=test&authorName=test`, {
        method: 'GET',
        headers: {
          'Authorization': authorization,
          'Content-Type': 'application/json',
        },
      });
      console.log(`Backend test response status: ${testResponse.status}`);
    } catch (error) {
      console.error(`Backend connectivity test failed:`, error);
    }

    for (const url of urls) {
      console.log(`Processing URL: ${url}`);
      
      try {
        // Validate URL format
        if (!url || typeof url !== 'string' || url.trim() === '') {
          results.push({
            url: url || 'Empty URL',
            status: 'error',
            error: 'Invalid URL format'
          });
          errorCount++;
          continue;
        }

        const trimmedUrl = url.trim();

        // Scrape the story
        const scrapedStory = await scraper.scrapeStory(trimmedUrl);

        // Validate required fields
        if (!scrapedStory.title || !scrapedStory.author || !scrapedStory.content) {
          const missingFields = [];
          if (!scrapedStory.title) missingFields.push('title');
          if (!scrapedStory.author) missingFields.push('author');
          if (!scrapedStory.content) missingFields.push('content');
          
          results.push({
            url: trimmedUrl,
            status: 'skipped',
            reason: `Missing required fields: ${missingFields.join(', ')}`,
            title: scrapedStory.title,
            author: scrapedStory.author
          });
          skippedCount++;
          continue;
        }

        // Check for duplicates using query parameters
        try {
          // Use hardcoded backend URL for container-to-container communication
          const duplicateCheckUrl = `http://backend:8080/api/stories/check-duplicate`;
          console.log(`Duplicate check URL: ${duplicateCheckUrl}`);
          const params = new URLSearchParams({
            title: scrapedStory.title,
            authorName: scrapedStory.author
          });
          
          const duplicateCheckResponse = await fetch(`${duplicateCheckUrl}?${params.toString()}`, {
            method: 'GET',
            headers: {
              'Authorization': authorization,
              'Content-Type': 'application/json',
            },
          });

          if (duplicateCheckResponse.ok) {
            const duplicateResult = await duplicateCheckResponse.json();
            if (duplicateResult.hasDuplicates) {
              results.push({
                url: trimmedUrl,
                status: 'skipped',
                reason: `Duplicate story found (${duplicateResult.count} existing)`,
                title: scrapedStory.title,
                author: scrapedStory.author
              });
              skippedCount++;
              continue;
            }
          }
        } catch (error) {
          console.warn('Duplicate check failed:', error);
          // Continue with import if duplicate check fails
        }

        // Create the story
        try {
          const storyData = {
            title: scrapedStory.title,
            summary: scrapedStory.summary || undefined,
            contentHtml: scrapedStory.content,
            sourceUrl: scrapedStory.sourceUrl || trimmedUrl,
            authorName: scrapedStory.author,
            tagNames: scrapedStory.tags && scrapedStory.tags.length > 0 ? scrapedStory.tags : undefined,
          };

          // Use hardcoded backend URL for container-to-container communication
          const createUrl = `http://backend:8080/api/stories`;
          console.log(`Create story URL: ${createUrl}`);
          const createResponse = await fetch(createUrl, {
            method: 'POST',
            headers: {
              'Authorization': authorization,
              'Content-Type': 'application/json',
            },
            body: JSON.stringify(storyData),
          });

          if (!createResponse.ok) {
            const errorData = await createResponse.json();
            throw new Error(errorData.message || 'Failed to create story');
          }

          const createdStory = await createResponse.json();
          
          results.push({
            url: trimmedUrl,
            status: 'imported',
            title: scrapedStory.title,
            author: scrapedStory.author,
            storyId: createdStory.id
          });
          importedCount++;

          console.log(`Successfully imported: ${scrapedStory.title} by ${scrapedStory.author} (ID: ${createdStory.id})`);

        } catch (error) {
          console.error(`Failed to create story for ${trimmedUrl}:`, error);
          
          let errorMessage = 'Failed to create story';
          if (error instanceof Error) {
            errorMessage = error.message;
          }

          results.push({
            url: trimmedUrl,
            status: 'error',
            error: errorMessage,
            title: scrapedStory.title,
            author: scrapedStory.author
          });
          errorCount++;
        }

      } catch (error) {
        console.error(`Error processing URL ${url}:`, error);
        
        let errorMessage = 'Unknown error';
        if (error instanceof Error) {
          errorMessage = error.message;
        }

        results.push({
          url: url,
          status: 'error',
          error: errorMessage
        });
        errorCount++;
      }
    }

    const response: BulkImportResponse = {
      results,
      summary: {
        total: urls.length,
        imported: importedCount,
        skipped: skippedCount,
        errors: errorCount
      }
    };

    console.log(`Bulk import completed:`, response.summary);

    // Trigger Typesense reindex if any stories were imported
    if (importedCount > 0) {
      try {
        console.log('Triggering Typesense reindex after bulk import...');
        const reindexUrl = `http://backend:8080/api/stories/reindex-typesense`;
        const reindexResponse = await fetch(reindexUrl, {
          method: 'POST',
          headers: {
            'Authorization': authorization,
            'Content-Type': 'application/json',
          },
        });
        
        if (reindexResponse.ok) {
          const reindexResult = await reindexResponse.json();
          console.log('Typesense reindex completed:', reindexResult);
        } else {
          console.warn('Typesense reindex failed:', reindexResponse.status);
        }
      } catch (error) {
        console.warn('Failed to trigger Typesense reindex:', error);
        // Don't fail the whole request if reindex fails
      }
    }

    return NextResponse.json(response);

  } catch (error) {
    console.error('Bulk import error:', error);

    if (error instanceof Error) {
      return NextResponse.json(
        { error: `Bulk import failed: ${error.message}` },
        { status: 500 }
      );
    }

    return NextResponse.json(
      { error: 'Bulk import failed due to an unknown error' },
      { status: 500 }
    );
  }
}