import {
  Controller,
  Get,
  HttpException,
  InternalServerErrorException,
  Param,
  StreamableFile,
  UseGuards,
} from "@nestjs/common";
import {
  ApiBearerAuth,
  ApiOperation,
  ApiParam,
  ApiProduces,
  ApiResponse,
  ApiTags,
} from "@nestjs/swagger";
import { LocalActorAuthGuard } from "src/auth/guards/actor-local.guard";
import { RolesGuard } from "src/auth/guards/role.guard";
import { Roles } from "src/decorators/roles.decorator";
import { CurrentUser } from "src/decorators/user.decorator";
import { RoleEnum } from "src/Types&Enums/role.enum";
import { CaseExpertReportService } from "./case-expert-report.service";

@ApiTags("expert-insurer-panel")
@Controller("expert-insurer")
@ApiBearerAuth()
@UseGuards(LocalActorAuthGuard, RolesGuard)
@Roles(RoleEnum.COMPANY)
export class CaseExpertReportInsurerController {
  constructor(
    private readonly caseExpertReportService: CaseExpertReportService,
  ) {}

  @Get("files/:publicId/report.pdf")
  @ApiOperation({
    summary: "Download insurer file report PDF",
    description:
      "Generates a PDF for the shared publicId (blame + claim combined): damaged owner, driver when different, insurance, vehicle, and accident report sections.",
  })
  @ApiParam({ name: "publicId" })
  @ApiProduces("application/pdf")
  @ApiResponse({ status: 200, description: "PDF file" })
  @ApiResponse({ status: 404, description: "File not found for this publicId" })
  async downloadInsurerReport(
    @CurrentUser() insurer: { clientKey?: string },
    @Param("publicId") publicId: string,
  ): Promise<StreamableFile> {
    try {
      const { buffer, filename } =
        await this.caseExpertReportService.generateForInsurer(
          publicId,
          insurer,
        );
      return new StreamableFile(buffer, {
        type: "application/pdf",
        disposition: `attachment; filename="${filename}"`,
      });
    } catch (error) {
      if (error instanceof HttpException) throw error;
      throw new InternalServerErrorException(
        error instanceof Error
          ? error.message
          : "Failed to generate insurer file report PDF",
      );
    }
  }
}