import { Breadcrumbs } from '@/components/breadcrumbs';
import { Icon } from '@/components/icon';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { Button } from '@/components/ui/button';
import {
    DropdownMenu,
    DropdownMenuContent,
    DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import {
    NavigationMenu,
    NavigationMenuItem,
    NavigationMenuList,
    navigationMenuTriggerStyle,
} from '@/components/ui/navigation-menu';
import {
    Sheet,
    SheetContent,
    SheetHeader,
    SheetTitle,
    SheetTrigger,
} from '@/components/ui/sheet';
import {
    Tooltip,
    TooltipContent,
    TooltipProvider,
    TooltipTrigger,
} from '@/components/ui/tooltip';
import { UserMenuContent } from '@/components/user-menu-content';
import { useInitials } from '@/hooks/use-initials';
import { cn, isSameUrl, resolveUrl } from '@/lib/utils';
import { dashboard } from '@/routes';
import { type BreadcrumbItem, type NavItem, type SharedData } from '@/types';
import { Link, usePage } from '@inertiajs/react';
import { Bell, BookOpen, Folder, LayoutGrid, Menu, Search, UserPlus } from 'lucide-react';
import { useEffect, useMemo, useState } from 'react';
import AppLogo from './app-logo';
import AppLogoIcon from './app-logo-icon';

const mainNavItems: NavItem[] = [
    {
        title: 'Dashboard',
        href: dashboard(),
        icon: LayoutGrid,
    },
];

const rightNavItems: NavItem[] = [
    {
        title: 'Repository',
        href: 'https://github.com/laravel/react-starter-kit',
        icon: Folder,
    },
    {
        title: 'Documentation',
        href: 'https://laravel.com/docs/starter-kits#react',
        icon: BookOpen,
    },
];

const activeItemStyles =
    'text-neutral-900 dark:bg-neutral-800 dark:text-neutral-100';

interface AppHeaderProps {
    breadcrumbs?: BreadcrumbItem[];
}

interface PendingInvoiceNotification {
    id: number;
    client_id: number | null;
    invoice_no: string;
    pending_sql_acc_code?: string | null;
    pending_client_name?: string | null;
    requires_client?: boolean;
    start_date: string | null;
    end_date: string | null;
    management_fee: string | number | null;
    media_fee: string | number | null;
    nett_amount: string | number | null;
    total_spending: string | number | null;
    client?: {
        name: string | null;
        customer_id: string | null;
    } | null;
}

function InvoiceNotifications() {
    const [invoices, setInvoices] = useState<PendingInvoiceNotification[]>([]);
    const [count, setCount] = useState(0);
    const [isLoading, setIsLoading] = useState(true);

    const currencyFormatter = useMemo(
        () =>
            new Intl.NumberFormat('en-US', {
                minimumFractionDigits: 2,
                maximumFractionDigits: 2,
            }),
        [],
    );

    useEffect(() => {
        let isMounted = true;

        const loadPendingInvoices = async () => {
            try {
                const response = await fetch('/api/customer-invoices/pending', {
                    headers: {
                        Accept: 'application/json',
                    },
                    credentials: 'same-origin',
                });

                if (!response.ok) {
                    throw new Error('Unable to load pending invoices.');
                }

                const data = await response.json();

                if (isMounted) {
                    setInvoices(data.invoices ?? []);
                    setCount(data.count ?? 0);
                }
            } catch {
                if (isMounted) {
                    setInvoices([]);
                    setCount(0);
                }
            } finally {
                if (isMounted) {
                    setIsLoading(false);
                }
            }
        };

        loadPendingInvoices();

        return () => {
            isMounted = false;
        };
    }, []);

    const formatAmount = (amount: string | number | null) => {
        const value = Number(amount ?? 0);

        return currencyFormatter.format(Number.isFinite(value) ? value : 0);
    };

    return (
        <DropdownMenu>
            <DropdownMenuTrigger asChild>
                <Button
                    variant="ghost"
                    size="icon"
                    className="group relative h-9 w-9 cursor-pointer"
                >
                    <Bell className="!size-5 opacity-80 group-hover:opacity-100" />
                    {count > 0 && (
                        <span className="absolute -top-1 -right-1 flex min-w-5 items-center justify-center rounded-full bg-red-600 px-1.5 text-[11px] leading-5 font-semibold text-white">
                            {count > 99 ? '99+' : count}
                        </span>
                    )}
                    <span className="sr-only">Pending invoice approvals</span>
                </Button>
            </DropdownMenuTrigger>
            <DropdownMenuContent
                className="w-[min(92vw,720px)] p-0"
                align="end"
            >
                <div className="border-b px-4 py-3">
                    <div className="text-sm font-semibold">
                        Pending invoice approvals
                    </div>
                    <div className="text-xs text-muted-foreground">
                        {count} invoice{count === 1 ? '' : 's'} waiting for
                        approval
                    </div>
                </div>
                <div className="max-h-[420px] overflow-auto">
                    {isLoading ? (
                        <div className="px-4 py-6 text-center text-sm text-muted-foreground">
                            Loading pending invoices...
                        </div>
                    ) : invoices.length === 0 ? (
                        <div className="px-4 py-6 text-center text-sm text-muted-foreground">
                            No invoices are waiting for approval.
                        </div>
                    ) : (
                        <table className="w-full text-sm">
                            <thead className="sticky top-0 bg-popover text-xs text-muted-foreground">
                                <tr className="border-b">
                                    <th className="px-4 py-2 text-left font-medium">
                                        Invoice
                                    </th>
                                    <th className="px-4 py-2 text-left font-medium">
                                        Client
                                    </th>
                                    <th className="px-4 py-2 text-left font-medium">
                                        SQL Acc
                                    </th>
                                    <th className="px-4 py-2 text-right font-medium">
                                        Media
                                    </th>
                                    <th className="px-4 py-2 text-right font-medium">
                                        Nett
                                    </th>
                                    <th className="px-4 py-2 text-left font-medium">
                                        Period
                                    </th>
                                    <th className="px-4 py-2 text-right font-medium">
                                        Action
                                    </th>
                                </tr>
                            </thead>
                            <tbody>
                                {invoices.map((invoice) => (
                                    <tr
                                        key={invoice.id}
                                        className="border-b last:border-b-0 hover:bg-accent/50"
                                    >
                                        <td className="px-4 py-2 font-medium">
                                            <Link
                                                href={
                                                    invoice.requires_client
                                                        ? `/client-invoices/${invoice.id}/client/create`
                                                        : `/client-invoices/${invoice.id}/edit`
                                                }
                                                className="text-primary hover:underline"
                                            >
                                                {invoice.invoice_no}
                                            </Link>
                                        </td>
                                        <td className="px-4 py-2 text-muted-foreground">
                                            {invoice.client?.name ?? invoice.pending_client_name ?? '-'}
                                        </td>
                                        <td className="px-4 py-2 text-muted-foreground">
                                            {invoice.pending_sql_acc_code ?? '-'}
                                        </td>
                                        <td className="px-4 py-2 text-right tabular-nums">
                                            {formatAmount(invoice.media_fee)}
                                        </td>
                                        <td className="px-4 py-2 text-right tabular-nums">
                                            {formatAmount(invoice.nett_amount)}
                                        </td>
                                        <td className="px-4 py-2 text-xs text-muted-foreground">
                                            {invoice.start_date ?? '-'} to{' '}
                                            {invoice.end_date ?? '-'}
                                        </td>
                                        <td className="px-4 py-2 text-right">
                                            {invoice.requires_client ? (
                                                <Link
                                                    href={`/client-invoices/${invoice.id}/client/create`}
                                                    className="inline-flex items-center gap-1 text-xs font-medium text-primary hover:underline"
                                                >
                                                    <UserPlus className="h-3.5 w-3.5" />
                                                    Link client
                                                </Link>
                                            ) : null}
                                        </td>
                                    </tr>
                                ))}
                            </tbody>
                        </table>
                    )}
                </div>
            </DropdownMenuContent>
        </DropdownMenu>
    );
}

export function AppHeader({ breadcrumbs = [] }: AppHeaderProps) {
    const page = usePage<SharedData>();
    const { auth } = page.props;
    const getInitials = useInitials();
    return (
        <>
            <div className="border-b border-sidebar-border/80">
                <div className="mx-auto flex h-16 items-center px-4 md:max-w-7xl">
                    {/* Mobile Menu */}
                    <div className="lg:hidden">
                        <Sheet>
                            <SheetTrigger asChild>
                                <Button
                                    variant="ghost"
                                    size="icon"
                                    className="mr-2 h-[34px] w-[34px]"
                                >
                                    <Menu className="h-5 w-5" />
                                </Button>
                            </SheetTrigger>
                            <SheetContent
                                side="left"
                                className="flex h-full w-64 flex-col items-stretch justify-between bg-sidebar"
                            >
                                <SheetTitle className="sr-only">
                                    Navigation Menu
                                </SheetTitle>
                                <SheetHeader className="flex justify-start text-left">
                                    <AppLogoIcon className="h-6 w-6 fill-current text-black dark:text-white" />
                                </SheetHeader>
                                <div className="flex h-full flex-1 flex-col space-y-4 p-4">
                                    <div className="flex h-full flex-col justify-between text-sm">
                                        <div className="flex flex-col space-y-4">
                                            {mainNavItems.map((item) => (
                                                <Link
                                                    key={item.title}
                                                    href={item.href}
                                                    className="flex items-center space-x-2 font-medium"
                                                >
                                                    {item.icon && (
                                                        <Icon
                                                            iconNode={item.icon}
                                                            className="h-5 w-5"
                                                        />
                                                    )}
                                                    <span>{item.title}</span>
                                                </Link>
                                            ))}
                                        </div>

                                        <div className="flex flex-col space-y-4">
                                            {rightNavItems.map((item) => (
                                                <a
                                                    key={item.title}
                                                    href={resolveUrl(item.href)}
                                                    target="_blank"
                                                    rel="noopener noreferrer"
                                                    className="flex items-center space-x-2 font-medium"
                                                >
                                                    {item.icon && (
                                                        <Icon
                                                            iconNode={item.icon}
                                                            className="h-5 w-5"
                                                        />
                                                    )}
                                                    <span>{item.title}</span>
                                                </a>
                                            ))}
                                        </div>
                                    </div>
                                </div>
                            </SheetContent>
                        </Sheet>
                    </div>

                    <Link
                        href={dashboard()}
                        prefetch
                        className="flex items-center space-x-2"
                    >
                        <AppLogo />
                    </Link>

                    {/* Desktop Navigation */}
                    <div className="ml-6 hidden h-full items-center space-x-6 lg:flex">
                        <NavigationMenu className="flex h-full items-stretch">
                            <NavigationMenuList className="flex h-full items-stretch space-x-2">
                                {mainNavItems.map((item, index) => (
                                    <NavigationMenuItem
                                        key={index}
                                        className="relative flex h-full items-center"
                                    >
                                        <Link
                                            href={item.href}
                                            className={cn(
                                                navigationMenuTriggerStyle(),
                                                isSameUrl(
                                                    page.url,
                                                    item.href,
                                                ) && activeItemStyles,
                                                'h-9 cursor-pointer px-3',
                                            )}
                                        >
                                            {item.icon && (
                                                <Icon
                                                    iconNode={item.icon}
                                                    className="mr-2 h-4 w-4"
                                                />
                                            )}
                                            {item.title}
                                        </Link>
                                        {isSameUrl(page.url, item.href) && (
                                            <div className="absolute bottom-0 left-0 h-0.5 w-full translate-y-px bg-black dark:bg-white"></div>
                                        )}
                                    </NavigationMenuItem>
                                ))}
                            </NavigationMenuList>
                        </NavigationMenu>
                    </div>

                    <div className="ml-auto flex items-center space-x-2">
                        <div className="relative flex items-center space-x-1">
                            <Button
                                variant="ghost"
                                size="icon"
                                className="group h-9 w-9 cursor-pointer"
                            >
                                <Search className="!size-5 opacity-80 group-hover:opacity-100" />
                            </Button>
                            <div className="hidden lg:flex">
                                {rightNavItems.map((item) => (
                                    <TooltipProvider
                                        key={item.title}
                                        delayDuration={0}
                                    >
                                        <Tooltip>
                                            <TooltipTrigger>
                                                <a
                                                    href={resolveUrl(item.href)}
                                                    target="_blank"
                                                    rel="noopener noreferrer"
                                                    className="group ml-1 inline-flex h-9 w-9 items-center justify-center rounded-md bg-transparent p-0 text-sm font-medium text-accent-foreground ring-offset-background transition-colors hover:bg-accent hover:text-accent-foreground focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:outline-none disabled:pointer-events-none disabled:opacity-50"
                                                >
                                                    <span className="sr-only">
                                                        {item.title}
                                                    </span>
                                                    {item.icon && (
                                                        <Icon
                                                            iconNode={item.icon}
                                                            className="size-5 opacity-80 group-hover:opacity-100"
                                                        />
                                                    )}
                                                </a>
                                            </TooltipTrigger>
                                            <TooltipContent>
                                                <p>{item.title}</p>
                                            </TooltipContent>
                                        </Tooltip>
                                    </TooltipProvider>
                                ))}
                            </div>
                        </div>
                        <InvoiceNotifications />
                        <DropdownMenu>
                            <DropdownMenuTrigger asChild>
                                <Button
                                    variant="ghost"
                                    className="size-10 rounded-full p-1"
                                >
                                    <Avatar className="size-8 overflow-hidden rounded-full">
                                        <AvatarImage
                                            src={auth.user.avatar}
                                            alt={auth.user.name}
                                        />
                                        <AvatarFallback className="rounded-lg bg-neutral-200 text-black dark:bg-neutral-700 dark:text-white">
                                            {getInitials(auth.user.name)}
                                        </AvatarFallback>
                                    </Avatar>
                                </Button>
                            </DropdownMenuTrigger>
                            <DropdownMenuContent className="w-56" align="end">
                                <UserMenuContent user={auth.user} />
                            </DropdownMenuContent>
                        </DropdownMenu>
                    </div>
                </div>
            </div>
            {/* {breadcrumbs.length > 1 && ( */}
                <div className="flex w-full border-b border-sidebar-border/70">
                    <div className="mx-auto flex h-12 w-full items-center justify-start px-4 text-neutral-500 md:max-w-7xl">
                        <Breadcrumbs breadcrumbs={breadcrumbs} />
                    </div>
                </div>
            {/* )} */}
        </>
    );
}