import { createPurchaseOrder, receivePurchaseOrder } from "@/lib/actions";
import { formatCurrency, formatDate } from "@/lib/format";
import { getLowStockParts, getPurchaseOrders, getVendors } from "@/lib/repository";

export default function PurchaseOrdersPage() {
  const vendors = getVendors();
  const orders = getPurchaseOrders();
  const lowStockParts = getLowStockParts();

  return (
    <div className="grid">
      <section className="two-up">
        <article className="panel">
          <h2 className="section-title">Create Purchase Order</h2>
          <p className="section-copy">Enter one line per row as `SKU,quantity,unit cost`.</p>
          <form action={createPurchaseOrder} className="form-grid">
            <div className="form-row">
              <label htmlFor="vendorCode">Vendor Code</label>
              <select className="select" id="vendorCode" name="vendorCode">
                {vendors.map((vendor) => <option key={vendor.id} value={vendor.code}>{vendor.code} - {vendor.name}</option>)}
              </select>
            </div>
            <div className="form-row"><label htmlFor="purchase-lines">Line Items</label><textarea className="textarea" id="purchase-lines" name="lines" placeholder={"PART-001,10,31.50\nPART-002,24,6.25"} required /></div>
            <div className="form-row"><label htmlFor="purchase-notes">Notes</label><textarea className="textarea" id="purchase-notes" name="notes" /></div>
            <button className="button" type="submit">Save Purchase Order</button>
          </form>
        </article>
        <article className="panel">
          <h2 className="section-title">Receiving Flow</h2>
          <p className="section-copy">Leave line quantities blank to receive the remaining balance, or enter `SKU,quantity` rows for a partial receipt.</p>
          <div className="table-wrap">
            <table className="table">
              <thead><tr><th>Order</th><th>Vendor</th><th>Status</th><th>Total</th><th>Qty Progress</th><th>Created</th><th>Action</th></tr></thead>
              <tbody>
                {orders.length === 0 ? (
                  <tr><td colSpan={7} className="muted">No purchase orders yet.</td></tr>
                ) : (
                  orders.map((order) => (
                    <tr key={order.id}>
                      <td>{order.orderNumber}</td>
                      <td>{order.vendorName}</td>
                      <td><span className={`pill ${order.status === "received" ? "" : "warning"}`}>{order.status}</span></td>
                      <td>{formatCurrency(order.totalAmount)}</td>
                      <td>{order.fulfilledQuantity} / {order.orderedQuantity}</td>
                      <td>{formatDate(order.createdAt)}</td>
                      <td>
                        {order.status === "received" ? (
                          <span className="muted">Received</span>
                        ) : (
                          <form action={receivePurchaseOrder} className="form-grid">
                            <input type="hidden" name="orderId" value={order.id} />
                            <textarea className="textarea" name="lines" placeholder={"PART-001,4\nPART-002,10"} />
                            <button className="button secondary" type="submit">Receive</button>
                          </form>
                        )}
                      </td>
                    </tr>
                  ))
                )}
              </tbody>
            </table>
          </div>
        </article>
      </section>
      <section className="panel">
        <h2 className="section-title">Restock Recommendations</h2>
        <p className="section-copy">Use this list to plan the next purchase order from items already below target.</p>
        <div className="table-wrap">
          <table className="table">
            <thead><tr><th>SKU</th><th>Name</th><th>On Hand</th><th>Reorder Point</th><th>Suggested Qty</th><th>Last Vendor</th></tr></thead>
            <tbody>
              {lowStockParts.length === 0 ? (
                <tr><td colSpan={6} className="muted">No parts currently need restocking.</td></tr>
              ) : (
                lowStockParts.map((part) => (
                  <tr key={part.id}>
                    <td>{part.sku}</td>
                    <td>{part.name}</td>
                    <td>{part.quantityOnHand} {part.unitOfMeasure}</td>
                    <td>{part.reorderPoint}</td>
                    <td>{part.suggestedReorderQuantity}</td>
                    <td>{part.preferredVendorName || "-"}</td>
                  </tr>
                ))
              )}
            </tbody>
          </table>
        </div>
      </section>
    </div>
  );
}