import { type NextRequest, NextResponse } from "next/server";
import { prisma } from "@/lib/prisma";
import { errorResponse, requireRole, ApiError } from "@/lib/api";
import {
  renderPartTravelers,
  type OperationCardData,
  type PartCoverData,
} from "@/lib/pdf";

/**
 * Admin-only. Return a single PDF containing:
 *   Page 1 - cover sheet (part header, file manifest, operation summary)
 *   Page 2..N - one traveler card per operation, sequence order.
 *
 * Matches the physical print workflow: staple the stack, the cover goes on
 * top for the project binder and the cards go out to the floor.
 */
export async function GET(_req: NextRequest, ctx: { params: Promise<{ id: string }> }) {
  try {
    await requireRole("admin");
    const { id } = await ctx.params;

    const part = await prisma.part.findUnique({
      where: { id },
      include: {
        assembly: {
          include: { project: { select: { code: true, name: true } } },
        },
        stepFile: { select: { originalName: true, sizeBytes: true, sha256: true } },
        drawingFile: { select: { originalName: true, sizeBytes: true, sha256: true } },
        cutFile: { select: { originalName: true, sizeBytes: true, sha256: true } },
        operations: {
          orderBy: { sequence: "asc" },
          include: { machine: { select: { name: true, kind: true } } },
        },
      },
    });
    if (!part) throw new ApiError(404, "not_found", "Part not found");

    if (part.operations.length === 0) {
      throw new ApiError(400, "no_operations", "This part has no operations to print");
    }

    const project = part.assembly.project;
    const assembly = { code: part.assembly.code, name: part.assembly.name };
    const partHeader = {
      code: part.code,
      name: part.name,
      material: part.material,
      qty: part.qty,
    };

    const cover: PartCoverData = {
      project,
      assembly,
      part: { ...partHeader, notes: part.notes },
      files: [
        { label: "STEP / 3D", file: part.stepFile },
        { label: "Drawing PDF", file: part.drawingFile },
        { label: "Cut file", file: part.cutFile },
      ],
      operations: part.operations.map((op) => ({
        sequence: op.sequence,
        name: op.name,
        machineName: op.machine?.name ?? null,
        qcRequired: op.qcRequired,
        qrToken: op.qrToken,
      })),
    };

    const cards: OperationCardData[] = part.operations.map((op) => ({
      project,
      assembly,
      part: partHeader,
      operation: {
        id: op.id,
        sequence: op.sequence,
        name: op.name,
        qrToken: op.qrToken,
        machineName: op.machine?.name ?? null,
        machineKind: op.machine?.kind ?? null,
        settings: op.settings,
        materialNotes: op.materialNotes,
        instructions: op.instructions,
        qcRequired: op.qcRequired,
        plannedMinutes: op.plannedMinutes,
        plannedUnits: op.plannedUnits,
      },
    }));

    const pdf = await renderPartTravelers({ cover, cards });
    const safeName = `${part.code}-travelers.pdf`.replace(/[^A-Za-z0-9._-]/g, "_");

    return new NextResponse(pdf as unknown as BodyInit, {
      status: 200,
      headers: {
        "Content-Type": "application/pdf",
        "Content-Disposition": `inline; filename="${safeName}"`,
        "Cache-Control": "private, no-store",
      },
    });
  } catch (err) {
    return errorResponse(err);
  }
}