import { createElement } from "react";
import type { LucideIcon } from "lucide-react";
import {
  AlertTriangle,
  Bell,
  CircleDollarSign,
  Clock,
  Inbox,
  MessageSquare,
  ShieldAlert,
  UserPlus,
  Wrench,
  X,
} from "lucide-react";
import { Link } from "react-router";
import { Text } from "@/components/ui/text";
import type { NotificationItem } from "@/domain/notifications/types/notification-feed";
import { workOrderViewUrl } from "@/domain/notifications/utils/notification-target-url";
import { isDismissable } from "@/domain/notifications/utils/visible-notification-sections";

const REASON_ICONS: Record<string, LucideIcon> = {
  "severity-critical": AlertTriangle,
  sla: AlertTriangle,
  mentions: MessageSquare,
  unassigned: Inbox,
  "due-soon": Clock,
  "no-vendor": Wrench,
  "aveta-missing": ShieldAlert,
  activity: MessageSquare,
  "vendor-conflict": Wrench,
};

const ICON_PROPS = {
  size: 15,
  "aria-hidden": true,
  className: "shrink-0",
  style: { color: "var(--color-text-muted)", marginTop: 2 },
} as const;

// Recent activity mixes comments, assignments and uplift decisions; where the row leads tells them apart.
function ItemIcon({ item }: { item: NotificationItem }) {
  if (item.reason === "activity" && item.target.tab === "uplifts") {
    return <CircleDollarSign {...ICON_PROPS} />;
  }
  if (item.reason === "activity" && item.target.tab !== "comments") {
    return <UserPlus {...ICON_PROPS} />;
  }
  return createElement(REASON_ICONS[item.reason] ?? Bell, ICON_PROPS);
}

type NotificationRowProps = {
  item: NotificationItem;
  unread: boolean;
  onOpen: (item: NotificationItem, url?: string) => void;
  onDismiss: (item: NotificationItem) => void;
};

/** A vendor conflict spans several work orders, so each one stays reachable from the row. */
function WorkOrderLinks({ item, onOpen }: Pick<NotificationRowProps, "item" | "onOpen">) {
  if (item.reason !== "vendor-conflict" || item.workOrders.length === 0) {
    return null;
  }

  return (
    <span className="flex flex-wrap gap-2" style={{ paddingLeft: 31, marginTop: 2 }}>
      {item.workOrders.map((workOrder) => {
        const url = workOrderViewUrl(workOrder.id);
        return (
          <Link
            key={workOrder.id}
            to={url}
            onClick={(event) => {
              event.preventDefault();
              onOpen(item, url);
            }}
            className="text-xs underline-offset-2 hover:underline"
            style={{ color: "var(--color-primary)" }}
          >
            {workOrder.number != null ? `WO #${workOrder.number}` : `WO ${workOrder.id}`}
          </Link>
        );
      })}
    </span>
  );
}

export function NotificationRow({ item, unread, onOpen, onDismiss }: NotificationRowProps) {
  return (
    <li
      className="group flex items-start gap-2.5 transition-colors hover:bg-[var(--color-bg-muted)]"
      style={{
        padding: "10px 8px",
        marginInline: -8,
        borderRadius: "var(--radius-md)",
        borderBottom: "1px solid var(--color-bg-muted)",
      }}
      data-unread={unread}
    >
      <span className="flex min-w-0 flex-1 flex-col">
        <button
          type="button"
          onClick={() => onOpen(item)}
          className="flex min-w-0 flex-1 cursor-pointer items-start gap-2.5 text-left"
        >
          <span
            aria-hidden
            className="shrink-0 rounded-full"
            style={{
              width: 6,
              height: 6,
              marginTop: 7,
              background: unread ? "var(--color-primary)" : "transparent",
            }}
          />
          <ItemIcon item={item} />
          <Text
            as="span"
            variant="description"
            sx={{ fontSize: 13, lineHeight: 1.45, fontWeight: unread ? 500 : 400, margin: 0 }}
          >
            {unread && <span className="sr-only">Unread: </span>}
            {item.title}
          </Text>
        </button>
        <WorkOrderLinks item={item} onOpen={onOpen} />
      </span>
      {isDismissable(item) && (
        <button
          type="button"
          onClick={() => onDismiss(item)}
          title="Dismiss"
          aria-label="Dismiss notification"
          className="shrink-0 cursor-pointer opacity-0 transition-opacity group-hover:opacity-100 focus-visible:opacity-100"
          style={{ color: "var(--color-text-muted)", marginTop: 2 }}
        >
          <X size={13} aria-hidden />
        </button>
      )}
    </li>
  );
}