import { NextRequest, NextResponse } from "next/server";
import React from "react";

export const runtime = "nodejs";

export async function POST(req: NextRequest) {
  try {
    const data = await req.json();

    // Dynamic import to avoid bundling issues
    const { Document, Page, Text, View, StyleSheet, pdf } = await import("@react-pdf/renderer");

    const styles = StyleSheet.create({
      page: { padding: 40, fontFamily: "Helvetica", fontSize: 11, color: "#27272a" },
      title: { fontSize: 22, fontWeight: "bold", marginBottom: 4 },
      subtitle: { fontSize: 11, color: "#71717a" },
      divider: { borderBottomWidth: 1, borderBottomColor: "#e4e4e7", marginVertical: 16 },
      scoreRow: { flexDirection: "row", justifyContent: "space-between", alignItems: "center", marginBottom: 16 },
      scoreLabel: { fontSize: 10, color: "#a1a1aa" },
      scoreValue: { fontSize: 28, fontWeight: "bold" },
      clauseCard: { marginBottom: 12, padding: 12, borderWidth: 1, borderColor: "#e4e4e7", borderRadius: 6 },
      clauseText: { fontSize: 10, color: "#3f3f46", lineHeight: 1.5, marginBottom: 6 },
      tag: { fontSize: 9, fontWeight: "bold", padding: "2 8", borderRadius: 3, marginRight: 4 },
      tagHigh: { backgroundColor: "#fef2f2", color: "#b91c1c" },
      tagMedium: { backgroundColor: "#fffbeb", color: "#a16207" },
      tagLow: { backgroundColor: "#eff6ff", color: "#1d4ed8" },
      footer: { position: "absolute", bottom: 30, left: 40, right: 40, fontSize: 8, color: "#a1a1aa", textAlign: "center" },
    });

    const flagged = (data.results || []).filter((r: any) => r.categories?.length > 0);

    const doc = React.createElement(
      Document,
      null,
      React.createElement(
        Page,
        { size: "A4", style: styles.page },
        // Header
        React.createElement(View, null,
          React.createElement(Text, { style: styles.title }, "ClauseGuard Report"),
          React.createElement(Text, { style: styles.subtitle },
            `${data.source_url || "Manual scan"} — ${new Date().toLocaleDateString()}`
          ),
        ),
        // Score
        React.createElement(View, { style: styles.scoreRow },
          React.createElement(View, null,
            React.createElement(Text, { style: styles.scoreLabel }, "RISK SCORE"),
            React.createElement(Text, { style: styles.scoreValue }, `${data.risk_score}/100`),
          ),
          React.createElement(Text, { style: { fontSize: 16, fontWeight: "bold" } }, `Grade ${data.grade}`),
        ),
        React.createElement(Text, { style: styles.subtitle },
          `${data.total_clauses} clauses scanned — ${data.flagged_count} flagged`
        ),
        React.createElement(View, { style: styles.divider }),
        // Clauses
        ...flagged.map((clause: any, i: number) =>
          React.createElement(View, { key: i, style: styles.clauseCard },
            React.createElement(Text, { style: styles.clauseText },
              clause.text?.substring(0, 300) || ""
            ),
            React.createElement(View, { style: { flexDirection: "row", flexWrap: "wrap" } },
              ...(clause.categories || []).map((cat: any, j: number) => {
                const tagStyle = cat.severity === "HIGH" ? styles.tagHigh : cat.severity === "MEDIUM" ? styles.tagMedium : styles.tagLow;
                return React.createElement(Text, { key: j, style: [styles.tag, tagStyle] }, cat.name);
              })
            ),
          )
        ),
        // Footer
        React.createElement(Text, { style: styles.footer },
          "Generated by ClauseGuard — clauseguard.com — Not legal advice"
        ),
      )
    );

    const instance = pdf(doc);
    const buffer = await instance.toBuffer();

    const chunks: Uint8Array[] = [];
    for await (const chunk of buffer as any) {
      chunks.push(chunk instanceof Uint8Array ? chunk : new Uint8Array(chunk));
    }

    return new Response(Buffer.concat(chunks), {
      headers: {
        "Content-Type": "application/pdf",
        "Content-Disposition": `attachment; filename="clauseguard-report.pdf"`,
      },
    });
  } catch (error) {
    console.error("PDF generation error:", error);
    return NextResponse.json({ error: "PDF generation failed" }, { status: 500 });
  }
}