"use client";

import { useMemo, useState } from "react";
import Link from "next/link";
import { usePathname } from "next/navigation";
import { ChevronDown, Moon, Sun, Menu, X } from "lucide-react";
import { cn } from "@/lib/utils";
import { useColorMode } from "@/components/providers/ColorModeProvider";
import { Button } from "@/components/ds";
import {
  CRM_PORTALS,
  navForPortal,
  type CrmPortalId,
} from "@/modules/crm/constants/portals";

function isActive(pathname: string, href: string) {
  const base = href.split("?")[0];
  return pathname === base || pathname.startsWith(`${base}/`);
}

export function CrmPortalShell({
  children,
  portalId,
  title,
}: {
  children: React.ReactNode;
  portalId: CrmPortalId;
  title?: string;
}) {
  const pathname = usePathname();
  const { mode, toggle } = useColorMode();
  const [openGroups, setOpenGroups] = useState<Record<string, boolean>>({});
  const [mobileOpen, setMobileOpen] = useState(false);
  const nav = navForPortal(portalId);
  const portalMeta = CRM_PORTALS.find((p) => p.id === portalId);

  const autoOpen = useMemo(() => {
    const map: Record<string, boolean> = {};
    for (const g of nav) {
      if (g.href && isActive(pathname, g.href)) map[g.id] = true;
      if (g.items?.some((i) => isActive(pathname, i.href))) map[g.id] = true;
    }
    return map;
  }, [pathname, nav]);

  const expanded = { ...autoOpen, ...openGroups };

  const sidebar = (
    <>
      <div className="mb-6 px-2">
        <Link href="/crm/hub" className="text-xs text-[var(--muted)] hover:text-[var(--crm-accent)]">
          تربت CRM
        </Link>
        <p className="mt-1 font-semibold text-secondary">{title ?? portalMeta?.label}</p>
      </div>
      <nav className="space-y-0.5 overflow-y-auto pb-8">
        {nav.map((group) => {
          const Icon = group.icon;
          const hasChildren = !!group.items?.length;
          const groupActive = group.href
            ? isActive(pathname, group.href)
            : group.items?.some((i) => isActive(pathname, i.href));
          const isOpen = expanded[group.id] ?? false;

          if (!hasChildren && group.href) {
            return (
              <Link
                key={group.id}
                href={group.href}
                onClick={() => setMobileOpen(false)}
                className={cn(
                  "flex items-center gap-3 rounded-xl px-3 py-2.5 text-sm font-medium transition-all duration-200",
                  groupActive
                    ? "bg-[var(--crm-accent)] text-white shadow-[var(--shadow-sm)]"
                    : "text-[var(--muted)] hover:bg-[var(--surface-muted)] hover:text-secondary"
                )}
              >
                <Icon className="h-4 w-4 shrink-0" />
                {group.label}
              </Link>
            );
          }

          return (
            <div key={group.id}>
              <button
                type="button"
                onClick={() =>
                  setOpenGroups((prev) => ({ ...prev, [group.id]: !(expanded[group.id] ?? false) }))
                }
                className={cn(
                  "flex w-full items-center gap-3 rounded-xl px-3 py-2.5 text-sm font-medium transition-colors",
                  groupActive
                    ? "bg-[var(--surface-muted)] text-secondary"
                    : "text-[var(--muted)] hover:bg-[var(--surface-muted)]"
                )}
              >
                <Icon className="h-4 w-4 shrink-0" />
                <span className="flex-1 text-right">{group.label}</span>
                <ChevronDown className={cn("h-4 w-4 transition-transform", isOpen && "rotate-180")} />
              </button>
              {isOpen && group.items ? (
                <div className="mr-3 mt-0.5 space-y-0.5 border-r border-[var(--border)] pr-2">
                  {group.items.map((item) => (
                    <Link
                      key={item.id}
                      href={item.href}
                      onClick={() => setMobileOpen(false)}
                      className={cn(
                        "block rounded-lg px-3 py-2 text-sm transition-colors",
                        isActive(pathname, item.href)
                          ? "bg-[var(--crm-accent-soft)] font-medium text-[var(--crm-accent)]"
                          : "text-[var(--muted)] hover:bg-[var(--surface-muted)] hover:text-secondary"
                      )}
                    >
                      {item.label}
                    </Link>
                  ))}
                </div>
              ) : null}
            </div>
          );
        })}
      </nav>
    </>
  );

  return (
    <div className="flex min-h-screen bg-[var(--canvas)]">
      <aside className="hidden w-64 shrink-0 flex-col border-l border-[var(--border)] bg-[var(--surface)] p-4 lg:flex">
        {sidebar}
        <div className="mt-auto flex items-center gap-2 border-t border-[var(--border)] pt-4">
          <Button variant="ghost" size="icon" onClick={toggle} aria-label="تغییر حالت تاریک/روشن">
            {mode === "dark" ? <Sun className="h-4 w-4" /> : <Moon className="h-4 w-4" />}
          </Button>
          <Link href="/dashboard" className="text-xs text-[var(--muted)] hover:text-secondary">
            workspace
          </Link>
        </div>
      </aside>

      {mobileOpen ? (
        <div className="fixed inset-0 z-50 lg:hidden">
          <button
            type="button"
            className="absolute inset-0 bg-black/40"
            onClick={() => setMobileOpen(false)}
            aria-label="بستن منو"
          />
          <aside className="absolute right-0 top-0 flex h-full w-72 flex-col bg-[var(--surface)] p-4 shadow-[var(--shadow-lg)]">
            <div className="mb-4 flex justify-end">
              <Button variant="ghost" size="icon" onClick={() => setMobileOpen(false)}>
                <X className="h-5 w-5" />
              </Button>
            </div>
            {sidebar}
          </aside>
        </div>
      ) : null}

      <div className="flex min-w-0 flex-1 flex-col">
        <header className="flex items-center gap-3 border-b border-[var(--border)] bg-[var(--surface)] px-4 py-3 lg:hidden">
          <Button variant="ghost" size="icon" onClick={() => setMobileOpen(true)}>
            <Menu className="h-5 w-5" />
          </Button>
          <span className="font-semibold text-secondary">{portalMeta?.label}</span>
        </header>
        <main className="flex-1 p-4 sm:p-6 lg:p-8">{children}</main>
      </div>
    </div>
  );
}