import React, { useState } from 'react';
import {
    Navbar,
    Stack,
    UnstyledButton,
    Text,
    ThemeIcon,
    createStyles,
    Collapse,
    rem,
    Divider,
    useMantineTheme,
} from '@mantine/core';
import {
    IconHome,
    IconUsers,
    IconChevronDown,
    IconFolder,
    IconSettings,
    IconUserCircle,
} from '@tabler/icons-react';
import { Inertia } from '@inertiajs/inertia';

const useStyles = createStyles((theme) => ({
    link: {
        display: 'flex',
        alignItems: 'center',
        width: '100%',
        padding: `${theme.spacing.sm}px ${theme.spacing.md}px`,
        borderRadius: theme.radius.sm,
        color: theme.colorScheme === 'dark' ? theme.colors.dark[0] : theme.black,
        fontWeight: 500,
        transition: 'all 0.2s ease',

        '&:hover': {
            backgroundColor:
                theme.colorScheme === 'dark'
                    ? theme.colors.dark[6]
                    : theme.colors.gray[0],
            cursor: 'pointer',
        },
    },
    active: {
        backgroundColor:
            theme.colorScheme === 'dark'
                ? theme.colors.dark[5]
                : theme.colors.gray[2],
        fontWeight: 700,
    },
    nested: {
        paddingLeft: rem(32),
    },
    toggleIcon: {
        marginLeft: 'auto',
        transition: 'transform 0.2s ease',
    },
    sectionTitle: {
        color: theme.colorScheme === 'dark' ? theme.colors.dark[2] : theme.colors.gray[7],
        fontSize: theme.fontSizes.xs,
        fontWeight: 700,
        textTransform: 'uppercase',
        padding: `${theme.spacing.xs}px ${theme.spacing.md}px`,
    },
}));

type SidebarItem = {
    label: string;
    href?: string;
    icon?: React.ReactNode;
    children?: SidebarItem[];
    section?: string;
};

const items: SidebarItem[] = [
    { label: 'Dashboard', href: route("dashboard"), icon: <IconHome size={16} />, section: 'Main' },
    {
        label: 'Clients',
        icon: <IconFolder size={16} />,
        section: 'Main',
        href: route("google-ads.accounts.index"),
    },
    {
        label: 'Users',
        icon: <IconUsers size={16} />,
        section: 'Management',
        href: route("management.users.index"),
    },
    {
        label: 'Roles',
        icon: <IconUserCircle size={16} />,
        section: 'Management',
        href: route("management.roles.index"),
    },
    // { label: 'Settings', href: '/settings', icon: <IconSettings size={16} /> , section: 'Management' },
];

export default function Sidebar() {
    const theme = useMantineTheme();
    const { classes, cx } = useStyles();
    const location = window.location.pathname;
    const [opened, setOpened] = useState<Record<string, boolean>>({});

    const toggle = (label: string) => {
        setOpened((prev) => ({ ...prev, [label]: !prev[label] }));
    };

    const renderItem = (item: SidebarItem, depth = 0) => {
        const hasChildren = !!item.children?.length;
        const isActive =
            item.href === location ||
            (hasChildren && item.children?.some((c) => c.href === location));

        return (
            <div key={item.label}>
                <UnstyledButton
                    className={cx(classes.link, { [classes.active]: isActive })}
                    style={{ paddingLeft: rem(16 + depth * 16) }}
                    onClick={(e) => {
                        e.preventDefault();
                        if (hasChildren) toggle(item.label);
                        else if (item.href) Inertia.visit(item.href);
                    }}
                >
                    {item.icon && <ThemeIcon size="sm" variant="light" mr="sm">{item.icon}</ThemeIcon>}
                    <Text>{item.label}</Text>
                    {hasChildren && (
                        <IconChevronDown
                            size={16}
                            className={classes.toggleIcon}
                            style={{
                                transform: opened[item.label] ? 'rotate(180deg)' : 'rotate(0deg)',
                            }}
                        />
                    )}
                </UnstyledButton>

                {hasChildren && (
                    <Collapse in={opened[item.label]}>
                        {item.children!.map((child) => renderItem(child, depth + 1))}
                    </Collapse>
                )}
            </div>
        );
    };

    const sections = Array.from(new Set(items.map((i) => i.section).filter(Boolean)));

    return (
        <Navbar
            width={{ base: 280 }}
            p="xs"
            style={{
                backgroundColor:
                    theme.colorScheme === 'dark'
                        ? theme.colors.dark[8]
                        : theme.colors.gray[0],
                borderRight: `1px solid ${
                    theme.colorScheme === 'dark'
                        ? theme.colors.dark[6]
                        : theme.colors.gray[2]
                }`,
                minHeight: '100%',
            }}
        >
            <Stack spacing="xs">
                {sections.map((section) => (
                    <div key={section}>
                        <Text className={classes.sectionTitle}>{section}</Text>
                        {items
                            .filter((item) => item.section === section)
                            .map((item) => renderItem(item))}
                        <Divider my="xs" />
                    </div>
                ))}
            </Stack>
        </Navbar>
    );
}