/* eslint-disable @typescript-eslint/no-explicit-any */
import { PrismaClient } from '@prisma/client';
import * as path from 'path';
import * as fs from 'fs';
import { ExcelReaderService } from './excel-reader';
import { BulkInserter } from './bulk-inserter';
import { ImportProgressServer } from './websocket-server';
import { ImportProgress, ImportResult } from './types';
import { FileDownloader } from './file-downloader';

interface ProcessedSection {
  sectionData: any;
  insertedRows: number;
}

export class CintasImportProcessor {
  private prisma: PrismaClient;
  private reader: ExcelReaderService;
  private inserter: BulkInserter;
  private progressServer: ImportProgressServer;
  private fileDownloader: FileDownloader;

  constructor() {
    this.prisma = new PrismaClient();
    this.reader = new ExcelReaderService();
    this.inserter = new BulkInserter();
    this.progressServer = ImportProgressServer.getInstance();
    this.fileDownloader = new FileDownloader();
  }

  async processCintasImport(importId: number): Promise<ImportResult> {
    let filePath: string | null = null;

    try {
      console.log(`[${new Date().toISOString()}] [CintasImport] Starting import processing for ID: ${importId}`);

      // Initialize the progress server if not already done
      if (!this.progressServer.isServerInitialized()) {
        this.progressServer.initialize();
      }

      // Get import record with layout configuration
      const importRecord = await this.prisma.import.findUnique({
        where: { id: importId },
        include: {
          layout: {
            include: {
              sections: {
                include: { fields: true }
              }
            }
          }
        }
      });

      // Get the file separately
      const file = importRecord?.fileId ? await this.prisma.file.findUnique({
        where: { id: importRecord.fileId }
      }) : null;

      if (!importRecord || !file) {
        console.error(`[${new Date().toISOString()}] [CintasImport] ERROR: Import not found or no file attached`);
        throw new Error('Import not found or no file attached');
      }

      console.log(`[${new Date().toISOString()}] [CintasImport] Loaded import record: ${importRecord.id}`);

      // Initialize progress tracking
      const progress: ImportProgress = {
        importId,
        status: 'processing',
        currentSection: '',
        currentRow: 0,
        totalRows: 0,
        errors: [],
        processedSections: 0,
        totalSections: importRecord.layout?.sections?.length || 0
      };

      // Save file to temporary location
      const filename = `import_${importId}_${Date.now()}.xlsx`;
      filePath = path.join(this.fileDownloader.getTempDir(), filename);

      let fileBuffer: Buffer;
      if (Buffer.isBuffer(file.data)) {
        fileBuffer = file.data;
      } else if (file.data instanceof Uint8Array) {
        fileBuffer = Buffer.from(file.data);
      } else if (typeof file.data === 'string') {
        fileBuffer = Buffer.from(file.data, 'base64');
      } else {
        fileBuffer = Buffer.from(file.data as Buffer);
      }

      fs.writeFileSync(filePath, fileBuffer);
      console.log(`[${new Date().toISOString()}] [CintasImport] File saved to: ${filePath}`);

      // Read Excel file
      console.log(`[${new Date().toISOString()}] [CintasImport] Starting Excel file reading...`);

      // Read file content as buffer
      const fileContent = fs.readFileSync(filePath);

      const sections = await this.reader.readExcelFile(
        fileContent,
        importRecord.layout,
        (sectionProgress: ImportProgress) => {
          this.progressServer.broadcastProgress(importId, sectionProgress);
        }
      );

      console.log(`[${new Date().toISOString()}] [CintasImport] Excel file read successfully. Found ${sections.length} sections`);

      // Process each section
      const processedSections: ProcessedSection[] = [];
      let totalInserted = 0;

      for (let i = 0; i < sections.length; i++) {
        const section = sections[i];

        console.log(`[${new Date().toISOString()}] [CintasImport] Processing section ${i + 1}/${sections.length}: ${section.name}`);
        progress.currentSection = section.name;
        progress.processedSections = i + 1;
        this.progressServer.broadcastProgress(importId, progress);

        try {
          // Ensure table exists for this section
          console.log(`[${new Date().toISOString()}] [CintasImport] Creating table ${section.tableName} for section ${section.name}`);
          await this.inserter.createImportTable(section.tableName, section.fields);

          const insertedRows = await this.inserter.insertSectionData(
            section,
            importId,
            (rows: number) => {
              progress.currentRow = rows;
              this.progressServer.broadcastProgress(importId, progress);
            }
          );

          processedSections.push({
            sectionData: section,
            insertedRows
          });

          totalInserted += insertedRows;
          console.log(`[${new Date().toISOString()}] [CintasImport] Completed section ${section.name}: ${insertedRows} rows inserted`);

        } catch (error) {
          const errorMessage = `Error processing section ${section.name}: ${error instanceof Error ? error.message : 'Unknown error'}`;
          progress.errors.push(errorMessage);
          console.error(`[${new Date().toISOString()}] [CintasImport] ERROR: ${errorMessage}`);
          this.progressServer.broadcastProgress(importId, progress);
        }
      }

      // Run the stored procedure to calculate summary
      console.log(`[${new Date().toISOString()}] [CintasImport] Running summary calculation procedure...`);
      try {
        await this.prisma.$executeRawUnsafe(
          `CALL cintas_calculate_summary(${importId})`
        );
        console.log(`[${new Date().toISOString()}] [CintasImport] Summary calculation completed successfully`);
      } catch (error) {
        console.error(`[${new Date().toISOString()}] [CintasImport] ERROR: Summary calculation failed: ${error instanceof Error ? error.message : 'Unknown error'}`);
        progress.errors.push(`Stored procedure error: ${error instanceof Error ? error.message : 'Unknown error'}`);
      }

      progress.status = 'completed';
      this.progressServer.broadcastProgress(importId, progress);
      console.log(`[${new Date().toISOString()}] [CintasImport] Import processing completed successfully. Total inserted: ${totalInserted}`);

      return {
        success: true,
        totalInserted,
        sections: processedSections
      };

    } catch (error) {
      const progress: ImportProgress = {
        importId,
        status: 'failed',
        currentSection: '',
        currentRow: 0,
        totalRows: 0,
        errors: [error instanceof Error ? error.message : 'Unknown error'],
        processedSections: 0,
        totalSections: 0
      };

      this.progressServer.broadcastProgress(importId, progress);
      console.error(`[${new Date().toISOString()}] [CintasImport] ERROR: Import processing failed: ${error instanceof Error ? error.message : 'Unknown error'}`);

      // Clean up temporary file if it exists
      if (filePath && fs.existsSync(filePath)) {
        try {
          fs.unlinkSync(filePath);
        } catch (cleanupError) {
          console.warn(`[${new Date().toISOString()}] [CintasImport] WARNING: Failed to clean up temporary file: ${cleanupError instanceof Error ? cleanupError.message : 'Unknown error'}`);
        }
      }

      return {
        success: false,
        totalInserted: 0,
        sections: [],
        errors: [error instanceof Error ? error.message : 'Unknown error']
      };
    }
  }
}