import {
  BadRequestException,
  Body,
  Controller,
  Delete,
  Get,
  HttpCode,
  Param,
  ParseIntPipe,
  Post,
  Put,
  Request,
  Res,
  StreamableFile,
} from '@nestjs/common';
import type { Response } from 'express';
import { createReadStream } from 'fs';
import { InboxService } from './inbox.service';
import { InboxPostprocessorService } from '../inbox-postprocessor/inbox-postprocessor.service';
import { BarcodeScannerService } from '../barcode/barcode-scanner.service';
import { UserSettingsService } from '../user-settings/user-settings.service';
import { RequirePermissions } from '../auth/permissions.decorator';
import { Permission } from '../auth/permissions.enum';

@Controller('api/inbox')
@RequirePermissions(Permission.VIEW_SCANNER)
export class InboxController {
  constructor(
    private readonly inboxService: InboxService,
    private readonly postprocessor: InboxPostprocessorService,
    private readonly barcodeScanner: BarcodeScannerService,
    private readonly userSettingsService: UserSettingsService,
  ) {}

  @Get()
  async list(@Request() req: any) {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    return this.inboxService.listFiles(preferredUsername);
  }

  @Post('rescan')
  async rescan() {
    return this.barcodeScanner.rescanAll();
  }

  @Get(':id/preview')
  async preview(
    @Param('id') id: string,
    @Request() req: any,
    @Res({ passthrough: true }) res: Response,
  ): Promise<StreamableFile> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    const { doc, pdfPath } = await this.inboxService.resolveDocument(
      id,
      preferredUsername,
    );

    res.setHeader('Content-Type', 'application/pdf');
    res.setHeader(
      'Content-Disposition',
      `inline; filename="${doc.OriginalName}"`,
    );
    return new StreamableFile(createReadStream(pdfPath));
  }

  @Get(':id/pages/:page/thumbnail')
  async pageThumbnail(
    @Param('id') id: string,
    @Param('page', ParseIntPipe) page: number,
    @Request() req: any,
    @Res({ passthrough: true }) res: Response,
  ): Promise<StreamableFile> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    const filePath = await this.inboxService.resolvePageImage(
      id,
      page,
      'thumbnail',
      preferredUsername,
    );

    res.setHeader('Content-Type', 'image/png');
    res.setHeader('Cache-Control', 'private, max-age=3600');
    return new StreamableFile(createReadStream(filePath));
  }

  @Delete(':id')
  @HttpCode(204)
  async remove(@Param('id') id: string, @Request() req: any): Promise<void> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    await this.inboxService.deleteDocument(id, preferredUsername);
  }

  @Delete(':id/pages/:page')
  @HttpCode(204)
  async removePage(
    @Param('id') id: string,
    @Param('page', ParseIntPipe) page: number,
    @Request() req: any,
  ): Promise<void> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    await this.inboxService.deletePage(id, page, preferredUsername);
  }

  @Post(':id/pages/:page/split')
  @HttpCode(204)
  async toggleManualSplit(
    @Param('id') id: string,
    @Param('page', ParseIntPipe) page: number,
    @Request() req: any,
  ): Promise<void> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    await this.inboxService.toggleManualSplit(id, page, preferredUsername);
  }

  @Post(':id/reset-edits')
  @HttpCode(204)
  async resetEdits(
    @Param('id') id: string,
    @Request() req: any,
  ): Promise<void> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    await this.inboxService.resetEdits(id, preferredUsername);
  }

  @Post(':id/postprocess')
  async postprocess(
    @Param('id') id: string,
    @Request() req: any,
    @Body()
    body: {
      sectionOffset?: number;
      processOnlyOne?: boolean;
      replaceDuplicate?: boolean;
    },
  ) {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    const { results, totalSections } = await this.postprocessor.runForDocument(
      id,
      preferredUsername,
      body?.sectionOffset ?? 0,
      body?.processOnlyOne ?? false,
      body?.replaceDuplicate ?? false,
    );
    return { results, totalSections };
  }

  @Put(':id/pages/:page/rotation')
  @HttpCode(204)
  async setPageRotation(
    @Param('id') id: string,
    @Param('page', ParseIntPipe) page: number,
    @Body() body: { rotation?: number },
    @Request() req: any,
  ): Promise<void> {
    const rotation = Number(body?.rotation);
    if (!Number.isFinite(rotation)) {
      throw new BadRequestException('rotation muss eine Zahl sein');
    }
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    await this.inboxService.setPageRotation(
      id,
      page,
      rotation,
      preferredUsername,
    );
  }

  @Get(':id/pages/:page/preview')
  async pagePreview(
    @Param('id') id: string,
    @Param('page', ParseIntPipe) page: number,
    @Request() req: any,
    @Res({ passthrough: true }) res: Response,
  ): Promise<StreamableFile> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    const filePath = await this.inboxService.resolvePageImage(
      id,
      page,
      'preview',
      preferredUsername,
    );

    res.setHeader('Content-Type', 'image/png');
    res.setHeader('Cache-Control', 'private, max-age=3600');
    return new StreamableFile(createReadStream(filePath));
  }

  @Post(':id/pages/:page/scan-region')
  async scanRegion(
    @Param('id') id: string,
    @Param('page', ParseIntPipe) page: number,
    @Body() body: { x: number; y: number; w: number; h: number },
    @Request() req: any,
  ): Promise<{ found: string[] }> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    return this.inboxService.scanRegion(
      id,
      page,
      body.x,
      body.y,
      body.w,
      body.h,
      preferredUsername,
    );
  }

  @Post(':id/source')
  @HttpCode(204)
  async updateSource(
    @Param('id') id: string,
    @Body() body: { source: any },
    @Request() req: any,
  ): Promise<void> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    await this.inboxService.updateSource(id, body.source, preferredUsername);
  }

  @Post(':id/download-segment')
  async downloadSegment(
    @Param('id') id: string,
    @Body() body: { pages: number[] },
    @Request() req: any,
    @Res({ passthrough: true }) res: Response,
  ): Promise<StreamableFile> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    const { buffer, filename } = await this.inboxService.getSegmentPdfBuffer(
      id,
      preferredUsername,
      body.pages ?? [],
    );
    const { Readable } = await import('stream');
    res.setHeader('Content-Type', 'application/pdf');
    res.setHeader(
      'Content-Disposition',
      `attachment; filename="${encodeURIComponent(filename)}"`,
    );
    return new StreamableFile(Readable.from(buffer));
  }

  @Post(':id/send-email')
  @HttpCode(204)
  async sendEmail(
    @Param('id') id: string,
    @Body()
    body: {
      to: string;
      subject: string;
      body: string;
      html?: string;
      segments: { pages: number[]; filename: string }[];
      sender?: string;
    },
    @Request() req: any,
  ): Promise<void> {
    const preferredUsername: string | null =
      req.user?.preferredUsername ?? null;
    const smtpOverride =
      body.sender === 'user'
        ? await this.userSettingsService.getSmtpConfig(req.user.userId)
        : null;
    await this.inboxService.sendAsEmail(id, preferredUsername, {
      ...body,
      smtpOverride: smtpOverride ?? undefined,
    });
  }
}