import React from "react";
import { getAvailableTransitionsByRole, getDeliveryAgreementComment, getOrderStatusComment, getStatusTone } from "../../constants/deliveryWorkflow";
import { demoUsers } from "../../data/mockAppData";
import { formatDateTime } from "../../utils/formatters";
import { Badge } from "../UI/Badge";
import { Button } from "../UI/Button";
import { Panel } from "../UI/Panel";

const getUsers = (users) => (Array.isArray(users) && users.length ? users : demoUsers);
const resolveUserName = (users, userId) => getUsers(users).find((user) => user.id === userId)?.name || "Не назначен";

const splitItem = (item) => {
  if (!item) {
    return { name: "Позиция", quantity: "" };
  }

  if (typeof item === "string") {
    const [name, quantity] = item.split("|").map((part) => part.trim());
    return {
      name: name || item,
      quantity: quantity || "",
    };
  }

  if (typeof item === "object") {
    return {
      name: item.name || item.label || "Позиция",
      quantity: typeof item.quantity === "number" ? String(item.quantity) : item.quantity || "",
    };
  }

  return { name: "Позиция", quantity: "" };
};

export const OrderDetailPanel = ({ order, users, currentUser, onStatusChange, onAssignDriver }) => {
  if (!order) {
    return (
      <Panel className="flex min-h-[460px] items-center justify-center">
        <p className="text-sm text-[var(--color-text-muted)]">Выберите заказ для просмотра деталей.</p>
      </Panel>
    );
  }

  const orderItems = Array.isArray(order.items) ? order.items.map(splitItem) : [];
  const orderHistory = Array.isArray(order.history) ? order.history : [];
  const role = currentUser?.role;
  const availableTransitions = role ? getAvailableTransitionsByRole({ status: order.status, role }) : [];
  const drivers = (Array.isArray(users) && users.length ? users : demoUsers).filter((u) => u.role === "driver");
  const canAssignDriver = role === "logistician" || role === "admin";

  return (
    <div className="space-y-5">
      <Panel className="space-y-5 p-6">
        <div className="flex flex-wrap items-start justify-between gap-4">
          <div>
            <p className="text-sm uppercase tracking-[0.2em] text-[var(--color-text-muted)]">Карточка заказа</p>
            <h2 className="mt-2 text-2xl font-semibold">{order.orderNumber}</h2>
            <p className="mt-1 text-sm text-[var(--color-text-muted)]">
              {order.customer.name} · {order.customer.address}
            </p>
          </div>
          <Badge tone={getStatusTone(order.status)}>{order.status}</Badge>
        </div>

        <p className="text-sm leading-6 text-[var(--color-text-muted)]">
          {getOrderStatusComment(order.status)}
        </p>

        <div className="grid gap-4 md:grid-cols-2 xl:grid-cols-4">
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Менеджер</p>
            <p className="mt-1 font-medium">{resolveUserName(users, order.managerId)}</p>
          </div>
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Логист</p>
            <p className="mt-1 font-medium">{resolveUserName(users, order.logisticianIds?.[0])}</p>
          </div>
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Водитель</p>
            <p className="mt-1 font-medium">{resolveUserName(users, order.assignedDriverId)}</p>
          </div>
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Дата создания</p>
            <p className="mt-1 font-medium">{formatDateTime(order.createdAt)}</p>
          </div>
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">План доставки</p>
            <p className="mt-1 font-medium">{formatDateTime(order.scheduledDelivery)}</p>
          </div>
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Канал связи</p>
            <p className="mt-1 font-medium">{order.customer.messenger}</p>
          </div>
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Согласование доставки</p>
            <p className="mt-1 font-medium">{order.deliveryAgreementStatus}</p>
          </div>
        </div>
      </Panel>

      <Panel className="space-y-4 p-5">
        <div className="flex flex-wrap items-center justify-between gap-3">
          <strong>Данные клиента</strong>
          <Badge tone={getStatusTone(order.status)}>{order.status}</Badge>
        </div>
        <p className="text-sm leading-6 text-[var(--color-text-muted)]">
          {getDeliveryAgreementComment(order.deliveryAgreementStatus)}
        </p>
        <div className="grid gap-4 md:grid-cols-2">
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Клиент</p>
            <p className="mt-1 font-medium">{order.customer.name}</p>
          </div>
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Телефон</p>
            <p className="mt-1 font-medium">{order.customer.phone}</p>
          </div>
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Адрес</p>
            <p className="mt-1 font-medium">{order.customer.address}</p>
          </div>
          <div>
            <p className="text-xs text-[var(--color-text-muted)]">Дата доставки</p>
            <p className="mt-1 font-medium">{formatDateTime(order.scheduledDelivery)}</p>
          </div>
        </div>
      </Panel>

      <Panel className="space-y-4 p-5">
        <strong>Состав заказа</strong>
        <div className="space-y-3">
          {orderItems.length ? (
            orderItems.map((item) => (
              <div
                key={`${item.name}-${item.quantity || "item"}`}
                className="flex items-center justify-between gap-3 rounded-[20px] border border-[var(--color-border)] bg-[var(--color-surface)] px-4 py-3 text-sm"
              >
                <span>{item.name}</span>
                {item.quantity ? <Badge tone="neutral">{item.quantity}</Badge> : null}
              </div>
            ))
          ) : (
            <p className="text-sm text-[var(--color-text-muted)]">Состав заказа не указан.</p>
          )}
        </div>
      </Panel>

      {order.orderNotes?.length ? (
        <Panel className="space-y-3 p-5">
          <strong>Комментарии</strong>
          <div className="space-y-2">
            {order.orderNotes.map((note) => (
              <div
                key={note.id}
                className="rounded-[20px] border border-[var(--color-border)] bg-[var(--color-surface)] p-4 text-sm leading-6"
              >
                {note.text}
              </div>
            ))}
          </div>
        </Panel>
      ) : null}

      {order.comments?.length ? (
        <Panel className="space-y-3 p-5">
          <strong>Дополнительные комментарии</strong>
          <div className="space-y-2 text-sm leading-6 text-[var(--color-text-muted)]">
            {order.comments.map((comment, index) => (
              <div key={`${comment}-${index}`} className="rounded-[20px] bg-[var(--color-surface)] p-4">
                {comment}
              </div>
            ))}
          </div>
        </Panel>
      ) : null}

      {availableTransitions.length ? (
        <Panel className="space-y-4 p-5">
          <strong>Действия</strong>
          <div className="flex flex-wrap gap-2">
            {availableTransitions.map((status) => (
              <Button
                key={status}
                variant={status === "Проблема доставки" || status === "Платное хранение" || status === "Отменён" ? "ghost" : "secondary"}
                onClick={() => onStatusChange?.(status)}
              >
                {status}
              </Button>
            ))}
          </div>
        </Panel>
      ) : null}

      {canAssignDriver ? (
        <Panel className="space-y-4 p-5">
          <strong>Назначить водителя</strong>
          <div className="flex flex-wrap gap-2">
            {drivers.map((driver) => (
              <Button
                key={driver.id}
                variant={order.assignedDriverId === driver.id ? "primary" : "secondary"}
                onClick={() => onAssignDriver?.({ orderId: order.id, driverId: driver.id, actorName: currentUser.name })}
              >
                {driver.name}
              </Button>
            ))}
            {order.assignedDriverId ? (
              <Button variant="ghost" onClick={() => onAssignDriver?.({ orderId: order.id, driverId: null, actorName: currentUser.name })}>
                Снять водителя
              </Button>
            ) : null}
          </div>
        </Panel>
      ) : null}

      {orderHistory.length ? (
        <Panel className="space-y-3 p-5">
          <strong>История</strong>
          <div className="space-y-2">
            {orderHistory.map((entry) => (
              <div
                key={entry.id}
                className="rounded-[20px] border border-[var(--color-border)] bg-[var(--color-surface)] p-4 text-sm leading-6"
              >
                <div className="flex flex-wrap items-center justify-between gap-3">
                  <span className="font-medium">{entry.action}</span>
                  <span className="text-[var(--color-text-muted)]">{formatDateTime(entry.at)}</span>
                </div>
                <div className="mt-2 text-[var(--color-text-muted)]">
                  {entry.oldStatus || "Начало"} → {entry.newStatus}
                </div>
              </div>
            ))}
          </div>
        </Panel>
      ) : null}
    </div>
  );
};