import React, { useEffect, useMemo, useState } from 'react';
import {
  IonButton,
  IonButtons,
  IonContent,
  IonHeader,
  IonItem,
  IonLabel,
  IonList,
  IonLoading,
  IonPage,
  IonText,
  IonTitle,
  IonToolbar,
  useIonViewWillEnter,
} from '@ionic/react';
import { RouteComponentProps, useHistory } from 'react-router-dom';
import { supabase } from '../supabase';
import type { Tables } from '../database.types';
import {
  setStatusBarBackground,
  setStatusBarStyle,
  Style,
} from '../utils/statusBar';

type Props = RouteComponentProps<{ id: string }>;
type Order = Tables<'orders'>;
type OrderItem = Tables<'order_items'>;

const statusSteps = [
  'pending',
  'confirmed',
  'packed',
  'out_for_delivery',
  'delivered',
] as const;

const statusTitles: Record<(typeof statusSteps)[number], string> = {
  pending: 'Pending',
  confirmed: 'Confirmed',
  packed: 'Packed',
  out_for_delivery: 'Out for delivery',
  delivered: 'Delivered',
};

const OrderDetail: React.FC<Props> = ({ match }) => {
  const history = useHistory();
  const [order, setOrder] = useState<Order | null>(null);
  const [items, setItems] = useState<OrderItem[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [errorMessage, setErrorMessage] = useState('');

  useIonViewWillEnter(() => {
    setStatusBarStyle(Style.Dark);
    setStatusBarBackground('#ffffff');
  });

  useEffect(() => {
    const loadOrder = async () => {
      setIsLoading(true);

      const [
        { data: orderData, error: orderError },
        { data: itemData, error: itemError },
      ] = await Promise.all([
        supabase.from('orders').select('*').eq('id', match.params.id).single(),
        supabase
          .from('order_items')
          .select('*')
          .eq('order_id', match.params.id)
          .order('created_at', { ascending: true }),
      ]);

      if (orderError || itemError || !orderData) {
        setErrorMessage('We could not load this order.');
        window.setTimeout(() => setErrorMessage(''), 4000);
        setOrder(null);
        setItems([]);
        setIsLoading(false);
        return;
      }

      setOrder(orderData);
      setItems(itemData ?? []);
      setIsLoading(false);
    };

    loadOrder();
  }, [match.params.id]);

  const activeStepIndex = useMemo(() => {
    if (!order) return 0;
    const index = statusSteps.indexOf(
      order.status as (typeof statusSteps)[number]
    );
    return index >= 0 ? index : 0;
  }, [order]);

  return (
    <IonPage>
      <IonHeader className="ion-no-border">
        <IonToolbar>
          <IonButtons slot="start">
            <IonButton fill="clear" onClick={() => history.replace('/orders')}>
              Back
            </IonButton>
          </IonButtons>
          <IonTitle>Track Order</IonTitle>
        </IonToolbar>
      </IonHeader>
      <IonContent className="ion-padding">
        <IonLoading isOpen={isLoading} message="Loading order details..." />

        {errorMessage && (
          <IonText color="danger">
            <p>{errorMessage}</p>
          </IonText>
        )}

        {!isLoading && !order ? (
          <div className="empty-state cart-empty">
            <h3>Order not found</h3>
            <p className="muted-text">
              We could not find that order. Try returning to your order list.
            </p>
            <IonButton onClick={() => history.replace('/orders')}>
              Back to orders
            </IonButton>
          </div>
        ) : (
          order && (
            <>
              <div className="tracking-summary-card">
                <span className="order-label">Order number</span>
                <h1>{order.order_number}</h1>
                <p className="muted-text">
                  Placed on {new Date(order.created_at).toLocaleString()}
                </p>
                <div className="order-card-row">
                  <span>Current status</span>
                  <strong>
                    {statusTitles[
                      order.status as (typeof statusSteps)[number]
                    ] ?? order.status}
                  </strong>
                </div>
                <div className="order-card-row">
                  <span>Total</span>
                  <strong>${Number(order.total).toFixed(2)}</strong>
                </div>
              </div>

              <div className="timeline-card">
                <h2>Delivery progress</h2>
                <div className="tracking-timeline">
                  {statusSteps.map((step, index) => {
                    const isActive = index <= activeStepIndex;
                    return (
                      <div
                        key={step}
                        className={`timeline-step ${isActive ? 'active' : ''}`}
                      >
                        <div className="timeline-dot" />
                        <div>
                          <strong>{statusTitles[step]}</strong>
                          <p className="muted-text">
                            {index < activeStepIndex
                              ? 'Completed'
                              : index === activeStepIndex
                                ? 'Current step'
                                : 'Up next'}
                          </p>
                        </div>
                      </div>
                    );
                  })}
                </div>
              </div>

              <div className="timeline-card">
                <h2>Items in this order</h2>
                <IonList lines="none" className="cart-list">
                  {items.map((item) => (
                    <IonItem key={item.id} className="cart-item">
                      <IonLabel>
                        <h2>{item.product_name}</h2>
                        <p>${Number(item.unit_price).toFixed(2)} each</p>
                        <strong>
                          Qty {item.quantity} · $
                          {(Number(item.unit_price) * item.quantity).toFixed(2)}
                        </strong>
                      </IonLabel>
                    </IonItem>
                  ))}
                </IonList>
              </div>
            </>
          )
        )}
      </IonContent>
    </IonPage>
  );
};

export default OrderDetail;