import { router } from '@inertiajs/react';
import {
    BrainCircuit,
    Database,
    FileSliders,
    KeyRound,
    LayoutDashboard,
    LogOut,
    MessageSquare,
    Users,
} from 'lucide-react';
import type { CSSProperties, ReactNode } from 'react';
import { useState, useSyncExternalStore } from 'react';

import { Avatar, AvatarFallback } from '@/components/ui/avatar';
import { Button } from '@/components/ui/button';
import AppearanceToggle from '@/components/appearance-toggle';
import {
    Dialog,
    DialogContent,
    DialogDescription,
    DialogFooter,
    DialogHeader,
    DialogTitle,
} from '@/components/ui/dialog';
import {
    Sidebar,
    SidebarContent,
    SidebarFooter,
    SidebarGroup,
    SidebarGroupContent,
    SidebarHeader,
    SidebarInset,
    SidebarMenu,
    SidebarMenuButton,
    SidebarMenuItem,
    SidebarProvider,
    SidebarRail,
    SidebarTrigger,
    useSidebar,
} from '@/components/ui/sidebar';
import { clearAuthSession, getStoredAuthUser } from '@/lib/auth';
import {
    dashboard as adminDashboard,
    llmConfig as adminLlmConfig,
    login as adminLogin,
    retrievalConfig as adminRetrievalConfig,
    vectordbConfig as adminVectorDbConfig,
} from '@/routes/admin';
import { index as adminApiKeys } from '@/routes/admin/api-keys';
import { index as adminUsers } from '@/routes/admin/users';

export type AdminMenu =
    | 'api-keys'
    | 'dashboard'
    | 'llm-config'
    | 'rag-config'
    | 'retrieval-config'
    | 'settings'
    | 'users'
    | 'vector-retrieval-config'
    | 'vectordb-config';

const adminSidebarStyle = {
    '--sidebar-width': '260px',
    '--sidebar-width-icon': '64px',
} as CSSProperties;

function getStoredAdminName(): string {
    return getStoredAuthUser()?.name ?? 'Admin';
}

function subscribeToAuthStorage(onStoreChange: () => void): () => void {
    if (typeof window === 'undefined') {
        return () => {};
    }

    window.addEventListener('storage', onStoreChange);

    return () => window.removeEventListener('storage', onStoreChange);
}

function useStoredAdminName(): string {
    return useSyncExternalStore(
        subscribeToAuthStorage,
        getStoredAdminName,
        () => 'Admin',
    );
}

function getInitials(name: string): string {
    return name
        .split(' ')
        .filter(Boolean)
        .slice(0, 2)
        .map((part) => part[0]?.toUpperCase())
        .join('');
}

function confirmLogout(): void {
    clearAuthSession();
    router.visit(adminLogin.url());
}

function AdminSidebarBrand() {
    const { state, toggleSidebar } = useSidebar();

    const handleBrandClick = (): void => {
        if (state === 'collapsed') {
            toggleSidebar();
        }
    };

    return (
        <button
            aria-label="Buka sidebar"
            className="lecturer-brand"
            onClick={handleBrandClick}
            type="button"
        >
            <span className="lecturer-brand-mark">
                <MessageSquare className="size-4" />
            </span>
            <span className="lecturer-brand-copy">RAG Hub</span>
        </button>
    );
}

function AdminSidebar({ activeMenu }: { activeMenu: AdminMenu }) {
    const adminName = useStoredAdminName();
    const [isLogoutDialogOpen, setIsLogoutDialogOpen] = useState(false);

    return (
        <>
            <Sidebar className="lecturer-sidebar" collapsible="icon">
                <SidebarHeader className="lecturer-sidebar-header">
                    <AdminSidebarBrand />

                    <SidebarTrigger className="lecturer-sidebar-trigger" />
                </SidebarHeader>

                <SidebarContent className="lecturer-sidebar-content">
                    <SidebarGroup className="lecturer-nav-group">
                        <SidebarGroupContent>
                            <SidebarMenu className="lecturer-nav-list">
                                <SidebarMenuItem>
                                    <SidebarMenuButton
                                        className="lecturer-nav-button"
                                        isActive={activeMenu === 'dashboard'}
                                        onClick={() =>
                                            router.visit(adminDashboard())
                                        }
                                        tooltip="Dashboard"
                                    >
                                        <LayoutDashboard className="size-4" />
                                        <span>Dashboard</span>
                                    </SidebarMenuButton>
                                </SidebarMenuItem>

                                <SidebarMenuItem>
                                    <SidebarMenuButton
                                        className="lecturer-nav-button"
                                        isActive={activeMenu === 'llm-config'}
                                        onClick={() =>
                                            router.visit(adminLlmConfig())
                                        }
                                        tooltip="LLM Config"
                                    >
                                        <BrainCircuit className="size-4" />
                                        <span>LLM Config</span>
                                    </SidebarMenuButton>
                                </SidebarMenuItem>

                                <SidebarMenuItem>
                                    <SidebarMenuButton
                                        className="lecturer-nav-button"
                                        isActive={
                                            activeMenu === 'vectordb-config'
                                        }
                                        onClick={() =>
                                            router.visit(adminVectorDbConfig())
                                        }
                                        tooltip="VectorDB Config"
                                    >
                                        <Database className="size-4" />
                                        <span>VectorDB Config</span>
                                    </SidebarMenuButton>
                                </SidebarMenuItem>

                                <SidebarMenuItem>
                                    <SidebarMenuButton
                                        className="lecturer-nav-button"
                                        isActive={
                                            activeMenu === 'retrieval-config'
                                        }
                                        onClick={() =>
                                            router.visit(adminRetrievalConfig())
                                        }
                                        tooltip="Retrieval Config"
                                    >
                                        <FileSliders className="size-4" />
                                        <span>Retrieval Config</span>
                                    </SidebarMenuButton>
                                </SidebarMenuItem>

                                <SidebarMenuItem>
                                    <SidebarMenuButton
                                        className="lecturer-nav-button"
                                        isActive={activeMenu === 'api-keys'}
                                        onClick={() =>
                                            router.visit(adminApiKeys())
                                        }
                                        tooltip="Generate API Key"
                                    >
                                        <KeyRound className="size-4" />
                                        <span>Generate API Key</span>
                                    </SidebarMenuButton>
                                </SidebarMenuItem>

                                <SidebarMenuItem>
                                    <SidebarMenuButton
                                        className="lecturer-nav-button"
                                        isActive={activeMenu === 'users'}
                                        onClick={() =>
                                            router.visit(adminUsers())
                                        }
                                        tooltip="User Management"
                                    >
                                        <Users className="size-4" />
                                        <span>User Management</span>
                                    </SidebarMenuButton>
                                </SidebarMenuItem>
                            </SidebarMenu>
                        </SidebarGroupContent>
                    </SidebarGroup>
                </SidebarContent>

                <SidebarFooter className="lecturer-sidebar-footer">
                    <SidebarMenu>
                        <SidebarMenuItem>
                            <SidebarMenuButton
                                className="lecturer-user-button"
                                tooltip={adminName}
                            >
                                <Avatar className="lecturer-user-avatar">
                                    <AvatarFallback>
                                        {getInitials(adminName) || 'AD'}
                                    </AvatarFallback>
                                </Avatar>
                                <span className="lecturer-user-copy">
                                    <span className="lecturer-user-name">
                                        {adminName}
                                    </span>
                                    <span className="lecturer-user-role">
                                        Admin
                                    </span>
                                </span>
                            </SidebarMenuButton>
                        </SidebarMenuItem>

                        <SidebarMenuItem>
                            <SidebarMenuButton
                                className="lecturer-logout-button"
                                onClick={() => setIsLogoutDialogOpen(true)}
                                tooltip="Logout"
                            >
                                <LogOut className="size-4" />
                                <span>Logout</span>
                            </SidebarMenuButton>
                        </SidebarMenuItem>
                    </SidebarMenu>
                </SidebarFooter>

                <SidebarRail />
            </Sidebar>

            <Dialog
                onOpenChange={setIsLogoutDialogOpen}
                open={isLogoutDialogOpen}
            >
                <DialogContent className="lecturer-confirm-dialog">
                    <DialogHeader>
                        <DialogTitle>Keluar dari akun admin?</DialogTitle>
                        <DialogDescription>
                            Anda perlu login kembali untuk mengakses dashboard
                            admin.
                        </DialogDescription>
                    </DialogHeader>

                    <DialogFooter className="lecturer-confirm-dialog-footer">
                        <Button
                            className="lecturer-cancel-button"
                            onClick={() => setIsLogoutDialogOpen(false)}
                            type="button"
                            variant="outline"
                        >
                            Batal
                        </Button>
                        <Button
                            className="lecturer-danger-button"
                            onClick={confirmLogout}
                            type="button"
                        >
                            Logout
                        </Button>
                    </DialogFooter>
                </DialogContent>
            </Dialog>
        </>
    );
}

export function AdminShell({
    activeMenu = 'dashboard',
    children,
}: {
    activeMenu?: AdminMenu;
    children: ReactNode;
}) {
    return (
        <SidebarProvider
            className="lecturer-dashboard-shell"
            defaultOpen
            style={adminSidebarStyle}
        >
            <AdminSidebar activeMenu={activeMenu} />

            <SidebarInset className="lecturer-workspace">
                <div className="flex items-center justify-between px-3 py-2 md:hidden">
                    <SidebarTrigger />
                    <AppearanceToggle className="lecturer-theme-toggle" />
                </div>
                {children}
            </SidebarInset>
        </SidebarProvider>
    );
}