route.ts

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

/**
 * PATCH /api/invoices/bulk
 *
 * Bulk operation endpoint for archive, delete, and tag operations.
 * Accepts up to 200 invoice IDs per request.
 *
 * Request body:
 * - invoiceIds: string[] (required)
 * - action: 'archive' | 'delete' | 'tag' (required)
 * - archived?: boolean (for archive action)
 * - tags?: string[] (for tag action)
 */
export async function PATCH(request: NextRequest) {
  try {
    const body = await request.json();
    const { invoiceIds, action, archived, tags } = body as {
      invoiceIds: string[];
      action: string;
      archived?: boolean;
      tags?: string[];
    };

    // Validate inputs
    if (!Array.isArray(invoiceIds) || invoiceIds.length === 0) {
      return NextResponse.json(
        { error: "invoiceIds must be a non-empty array" },
        { status: 400 },
      );
    }

    if (invoiceIds.length > 200) {
      return NextResponse.json(
        { error: "Maximum 200 invoices per request" },
        { status: 400 },
      );
    }

    if (!["archive", "delete", "tag"].includes(action)) {
      return NextResponse.json(
        { error: "action must be 'archive', 'delete', or 'tag'" },
        { status: 400 },
      );
    }

    if (action === "archive" && typeof archived !== "boolean") {
      return NextResponse.json(
        { error: "archived must be a boolean for archive action" },
        { status: 400 },
      );
    }

    if (action === "tag" && !Array.isArray(tags)) {
      return NextResponse.json(
        { error: "tags must be an array for tag action" },
        { status: 400 },
      );
    }

    // TODO: Implement actual database operations
    // For now, validate the request and return success.
    // In production:
    // - archive: Update archived status in database
    // - delete: Mark invoices as deleted or remove them
    // - tag: Apply tags to invoices

    let message = "";
    switch (action) {
      case "archive":
        message = `${invoiceIds.length} invoices ${archived ? "archived" : "unarchived"}`;
        break;
      case "delete":
        message = `${invoiceIds.length} invoices deleted`;
        break;
      case "tag":
        message = `${invoiceIds.length} invoices tagged with: ${tags?.join(", ")}`;
        break;
    }

    return NextResponse.json(
      {
        success: true,
        count: invoiceIds.length,
        action,
        message,
      },
      { status: 200 },
    );
  } catch (error) {
    console.error("Bulk invoice operation error:", error);
    return NextResponse.json(
      { error: "Failed to process bulk operation" },
      { status: 500 },
    );
  }
}