import { NextRequest, NextResponse } from "next/server";
import { getDb } from "@/lib/db";

export async function GET(request: NextRequest) {
  const sql = getDb();
  const { searchParams } = new URL(request.url);
  const search = searchParams.get("search") || "";
  const category = searchParams.get("category") || "";
  const lowStock = searchParams.get("lowStock") === "true";
  const supplierName = searchParams.get("supplier_name") || "";

  let query = `
    SELECT c.*, cat.name as category_name,
      cust.name as customer_name,
      COALESCE((
        SELECT SUM(spi.quantity - spi.received_quantity)
        FROM supplier_po_items spi
        JOIN supplier_pos sp ON sp.id = spi.supplier_po_id
        WHERE spi.component_id = c.id
          AND sp.status IN ('ordered', 'partially_received')
          AND spi.quantity > spi.received_quantity
      ), 0)::int AS on_order
    FROM components c
    LEFT JOIN categories cat ON c.category_id = cat.id
    LEFT JOIN customers cust ON c.customer_id = cust.id
    WHERE 1=1
  `;
  const params: (string | number)[] = [];

  if (search) {
    params.push(`%${search}%`, `%${search}%`, `%${search}%`);
    query += ` AND (c.name ILIKE $${params.length - 2} OR c.part_number ILIKE $${params.length - 1} OR c.manufacturer ILIKE $${params.length})`;
  }

  if (category) {
    params.push(Number(category));
    query += ` AND c.category_id = $${params.length}`;
  }

  if (lowStock) {
    query += ` AND c.stock_quantity <= c.min_stock_level`;
  }

  if (supplierName) {
    params.push(supplierName);
    query += ` AND c.supplier = $${params.length}`;
  }

  query += ` ORDER BY c.updated_at DESC`;

  const rows = await sql(query, params);
  return NextResponse.json(rows);
}

export async function POST(request: NextRequest) {
  const sql = getDb();
  const body = await request.json();
  const {
    part_number,
    name,
    description,
    category_id,
    manufacturer,
    package_type,
    unit_price,
    stock_quantity,
    min_stock_level,
    datasheet_url,
    supplier,
    supplier_part_number,
    shelf_location,
    is_internal,
    customer_supplied,
    customer_id,
    specs,
  } = body;

  const rows = await sql(
    `INSERT INTO components (part_number, name, description, category_id, manufacturer, package_type, unit_price, stock_quantity, min_stock_level, datasheet_url, supplier, supplier_part_number, shelf_location, is_internal, customer_supplied, customer_id, specs)
     VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17)
     RETURNING *`,
    [
      part_number,
      name,
      description || null,
      category_id || null,
      manufacturer || null,
      package_type || null,
      unit_price || 0,
      stock_quantity || 0,
      min_stock_level || 0,
      datasheet_url || null,
      supplier || null,
      supplier_part_number || null,
      shelf_location || null,
      is_internal ?? false,
      customer_supplied ?? false,
      customer_supplied ? (customer_id || null) : null,
      JSON.stringify(specs || {}),
    ]
  );

  return NextResponse.json(rows[0], { status: 201 });
}