import { Public } from "@edr/api-common";
import { Controller, Get, Header, Param, ParseUUIDPipe, Query, Res } from "@nestjs/common";
import { Response } from "express";
import { ApiOperation, ApiQuery, ApiTags } from "@nestjs/swagger";

import { PublicationsService } from "./publications.service";

/**
 * The portal's /publications page — a public library of PDFs, Markdown
 * write-ups and PowerPoint decks about the platform. No login required, same
 * as /help, /faq and the legal pages: prospects reach it before any account
 * exists.
 */
@ApiTags("publications")
@Public()
@Controller("publications")
export class PublicPublicationsController {
  constructor(private readonly service: PublicationsService) {}

  @Get()
  // Cheap to serve stale for a few minutes; every anonymous page view hits it.
  @Header("Cache-Control", "public, max-age=300")
  @ApiOperation({ summary: "List published publications for the public library" })
  list() {
    return this.service.listPublic();
  }

  @Get(":id/file")
  @ApiQuery({
    name: "download",
    required: false,
    description: "Set to 1/true to force a download instead of inline preview.",
  })
  @ApiOperation({ summary: "Stream a published publication's file" })
  async getFile(
    @Param("id", ParseUUIDPipe) id: string,
    @Query("download") download: string | undefined,
    @Res() res: Response,
  ) {
    const { stream, record } = await this.service.getPublishedFileStream(id);
    const forceDownload = download === "1" || download === "true";

    res.setHeader("Content-Type", record.fileMimeType);
    res.setHeader(
      "Content-Disposition",
      `${forceDownload ? "attachment" : "inline"}; filename="${record.fileName}"`,
    );
    res.setHeader("Cache-Control", "public, max-age=300");
    stream.pipe(res);
  }
}