import { NextRequest, NextResponse } from "next/server";
import {
  getExportDocuments,
  compileExportMarkdown,
  generateExportDocx,
  type ExportSortOption,
} from "@mcpedia/core";

export const dynamic = "force-dynamic";

export async function GET(req: NextRequest) {
  const { searchParams } = new URL(req.url);
  const path = searchParams.get("path") || undefined;
  const section = searchParams.get("section") || undefined;
  const format = searchParams.get("format") || "json";
  const sortBy = (searchParams.get("sort") as ExportSortOption) || "category_points";
  const slugsParam = searchParams.get("slugs");
  const slugs = slugsParam ? slugsParam.split(",").map((s) => s.trim()) : undefined;
  const pageBreaksParam = searchParams.get("pageBreaks");
  const pageBreaks = pageBreaksParam !== "false" && pageBreaksParam !== "0";

  try {
    const data = await getExportDocuments({
      path,
      section,
      slugs,
      sortBy,
    });

    const safeFilename = data.summary.title
      .toLowerCase()
      .replace(/[^a-z0-9]+/g, "-")
      .replace(/^-|-$/g, "") || "mcpedia-export";

    if (format === "docx" || format === "word") {
      const buffer = await generateExportDocx(data, { pageBreaks });
      const uint8 = new Uint8Array(buffer);
      return new NextResponse(uint8, {
        headers: {
          "Content-Type":
            "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
          "Content-Disposition": `attachment; filename="${safeFilename}.docx"`,
        },
      });
    }

    if (format === "markdown" || format === "md") {
      const md = compileExportMarkdown(data);
      return new NextResponse(md, {
        headers: {
          "Content-Type": "text/markdown; charset=utf-8",
          "Content-Disposition": `attachment; filename="${safeFilename}.md"`,
        },
      });
    }

    return NextResponse.json(data);
  } catch (err) {
    return NextResponse.json(
      { error: err instanceof Error ? err.message : "Export failed" },
      { status: 500 },
    );
  }
}