import {
  BadRequestException,
  Body,
  Controller,
  Post,
  UploadedFile,
  UploadedFiles,
  UseInterceptors,
} from '@nestjs/common';
import { FileInterceptor, FilesInterceptor } from '@nestjs/platform-express';
import { UseModule } from '../module-registry/module.guard';
import type { UploadedFileLike } from '../auth/types/auth-user';
import {
  analyzeBundle,
  type BundleExportFormat,
  type BundleItemKind,
  exportBundleItem,
} from './cert-bundle';
import { CertManagerService } from './cert-manager.service';

/**
 * CertManagerController — 4 POST endpoints for certificate operations.
 *
 * All routes are protected by:
 * - Global JwtAuthGuard (authentication)
 * - Global TenantGuard (tenant context)
 * - @UseModule('cert-manager') ModuleGuard (module activation check)
 *
 * File size limit: 5 MB per file (T-09-03 — DoS mitigation).
 * Password parameter is never passed to a logger (T-09-02 — InfoDisc mitigation).
 */
@Controller('modules/cert-manager')
@UseModule('cert-manager')
export class CertManagerController {
  constructor(private readonly certManagerService: CertManagerService) {}

  /**
   * POST /modules/cert-manager/parse
   * Inspect a single certificate: subject, issuer, validity, SANs, fingerprints.
   * Accepts multipart file upload OR JSON body with pemText.
   */
  @Post('parse')
  @UseInterceptors(
    FileInterceptor('file', {
      limits: { fileSize: 5 * 1024 * 1024 },
    }),
  )
  async parseCert(
    @UploadedFile() file: UploadedFileLike | undefined,
    @Body('password') password?: string,
    @Body('pemText') pemText?: string,
  ) {
    if (!file && !pemText) {
      throw new BadRequestException('No file or PEM text provided');
    }
    return this.certManagerService.parseCert({ file, pemText, password });
  }

  /**
   * POST /modules/cert-manager/split
   * Split a fullchain.pem or P7B bundle into individual certificates.
   */
  @Post('split')
  @UseInterceptors(
    FileInterceptor('file', {
      limits: { fileSize: 5 * 1024 * 1024 },
    }),
  )
  async splitCerts(
    @UploadedFile() file: UploadedFileLike | undefined,
    @Body('password') password?: string,
  ) {
    if (!file) {
      throw new BadRequestException('No file provided');
    }
    return this.certManagerService.splitCerts({ file, password });
  }

  /**
   * POST /modules/cert-manager/merge
   * Merge multiple certificates into a PEM chain or PFX bundle.
   * Uses FilesInterceptor (plural) to accept multiple files with field name "files".
   */
  @Post('merge')
  @UseInterceptors(
    FilesInterceptor('files', 20, {
      limits: { fileSize: 5 * 1024 * 1024 },
    }),
  )
  async mergeCerts(
    @UploadedFiles() files: UploadedFileLike[],
    @Body('outputFormat') outputFormat: string,
    @Body('password') password?: string,
  ) {
    if (!files || files.length < 2) {
      throw new BadRequestException('At least 2 files required for merge');
    }
    return this.certManagerService.mergeCerts({ files, outputFormat, password });
  }

  /**
   * POST /modules/cert-manager/convert
   * Convert a certificate between PEM, DER, and P7B formats.
   * Accepts a multipart file upload OR a pemText body field.
   *
   * T-09-03: fileSize limit 5 MB (DoS mitigation)
   * T-09-04: global JwtAuthGuard + @UseModule('cert-manager') ModuleGuard
   * T-09-02: password is never passed to the logger
   */
  @Post('convert')
  @UseInterceptors(
    FileInterceptor('file', {
      limits: { fileSize: 5 * 1024 * 1024 },
    }),
  )
  async convertCert(
    @UploadedFile() file: UploadedFileLike | undefined,
    @Body('targetFormat') targetFormat: string,
    @Body('password') password?: string,
    @Body('pemText') pemText?: string,
  ) {
    if (!file && !pemText) {
      throw new BadRequestException('No file or PEM text provided');
    }
    return this.certManagerService.convertCert({ file, pemText, targetFormat, password });
  }

  /**
   * POST /modules/cert-manager/analyze (quick-261001-l4q)
   * Zertifikatspaket: mehrere Dateien oder ZIP hochladen, jedes Teil erkennen
   * (Server-/Zwischen-/Stammzertifikat, privater Schluessel, CSR), Duplikate
   * zusammenfassen, Schluessel und Kette zuordnen.
   *
   * T-09-03: 20 Dateien, je 5 MB; ZIP-Inhalt zusaetzlich begrenzt (cert-bundle.ts).
   * T-09-02: password is never passed to the logger
   */
  @Post('analyze')
  @UseInterceptors(
    FilesInterceptor('files', 20, {
      limits: { fileSize: 5 * 1024 * 1024 },
    }),
  )
  async analyze(
    @UploadedFiles() files: UploadedFileLike[] | undefined,
    @Body('password') password?: string,
  ) {
    return analyzeBundle(files ?? [], password ?? '');
  }

  /**
   * POST /modules/cert-manager/export (quick-261001-l4q)
   * Ein Teil aus `analyze` (PEM) in das gewuenschte Format bringen.
   * JSON-Body; PFX verlangt ein Passwort fuer die neue Datei.
   */
  @Post('export')
  async export(
    @Body('kind') kind: BundleItemKind,
    @Body('pem') pem: string,
    @Body('format') format: BundleExportFormat,
    @Body('baseName') baseName?: string,
    @Body('chain') chain?: string[],
    @Body('keyPem') keyPem?: string,
    @Body('password') password?: string,
  ) {
    if (
      chain !== undefined &&
      (!Array.isArray(chain) || chain.some((c) => typeof c !== 'string'))
    ) {
      throw new BadRequestException('chain must be a list of PEM strings');
    }
    return exportBundleItem({ kind, pem, format, baseName, chain, keyPem, password });
  }
}