import { useState } from "react";
import { NavLink } from "react-router";
import { Box, Drawer } from "@mui/material";

import { BrandLockup, BrandMark } from "@/components/common/brand-lockup";
import { getSidebarWidth, navGroups, type NavItemDef } from "@/config/menu";

function getNavItemAppearance(isActive: boolean, isHover: boolean) {
  if (isActive) {
    return {
      itemColor: "var(--primary)",
      iconColor: "var(--primary)",
      itemBg: "var(--color-sidebar-item-active-bg)",
    };
  }

  if (isHover) {
    return {
      itemColor: "var(--primary-hover)",
      iconColor: "var(--primary-hover)",
      itemBg: "var(--sidebar-accent)",
    };
  }

  return {
    itemColor: "var(--foreground)",
    iconColor: "var(--muted-foreground)",
    itemBg: "transparent",
  };
}

type NavItemProps = NavItemDef & {
  collapsed: boolean;
  end?: boolean;
};

function NavItem({ label, icon: Icon, path, collapsed, end, badge }: NavItemProps) {
  const [hovered, setHovered] = useState(false);

  return (
    <NavLink to={path} end={end} className="no-underline" title={collapsed ? label : undefined}>
      {({ isActive }) => {
        const isHover = hovered && !isActive;
        const { itemColor, iconColor, itemBg } = getNavItemAppearance(isActive, isHover);

        return (
          <Box
            onMouseEnter={() => setHovered(true)}
            onMouseLeave={() => setHovered(false)}
            sx={{
              position: "relative",
              display: "flex",
              alignItems: "center",
              width: "100%",
              height: 40,
              gap: "12px",
              px: collapsed ? 0 : "12px",
              justifyContent: collapsed ? "center" : "flex-start",
              borderRadius: "6px",
              cursor: "pointer",
              fontFamily: "var(--font-sans)",
              fontSize: 14,
              fontWeight: isActive ? 600 : 500,
              color: itemColor,
              backgroundColor: itemBg,
              boxShadow: isActive ? "var(--color-sidebar-item-active-shadow)" : "none",
              transition: "all var(--duration-fast, 150ms) var(--ease-default, ease)",
              mb: "4px",
              textAlign: "left",
            }}
          >
            {isActive && (
              <Box
                component="span"
                sx={{
                  position: "absolute",
                  left: 0,
                  top: 8,
                  bottom: 8,
                  width: 3,
                  borderRadius: "0 3px 3px 0",
                  backgroundColor: "var(--primary)",
                }}
              />
            )}
            <Icon size={19} className="shrink-0" style={{ color: iconColor }} />
            {!collapsed && (
              <>
                <Box className="truncate flex-1">{label}</Box>
                {badge != null && (
                  <Box
                    component="span"
                    className="inline-flex shrink-0 items-center justify-center"
                    sx={{
                      height: 18,
                      minWidth: 18,
                      px: "6px",
                      borderRadius: "9999px",
                      backgroundColor: "var(--accent)",
                      color: "#ffffff",
                      fontFamily: "var(--font-sans)",
                      fontSize: 10,
                      fontWeight: 700,
                      lineHeight: 1,
                    }}
                  >
                    {badge}
                  </Box>
                )}
              </>
            )}
          </Box>
        );
      }}
    </NavLink>
  );
}

type AppSidebarProps = {
  collapsed: boolean;
};

export function AppSidebar({ collapsed }: AppSidebarProps) {
  const width = getSidebarWidth(collapsed);

  return (
    <Drawer
      variant="permanent"
      sx={{
        width,
        flexShrink: 0,
        "& .MuiDrawer-paper": {
          width,
          boxSizing: "border-box",
          backgroundColor: "var(--color-sidebar-bg)",
          borderRight: "1px solid var(--color-sidebar-border)",
          borderRadius: 0,
          transition: "width 200ms var(--ease-default, ease)",
          overflowX: "hidden",
        },
      }}
    >
      <Box className="flex h-full flex-col overflow-hidden">
        <Box
          className="flex shrink-0 items-center"
          sx={{
            height: "var(--spacing-topbar)",
            gap: "10px",
            px: collapsed ? 0 : "16px",
            justifyContent: collapsed ? "center" : "flex-start",
            backgroundColor: "var(--card)",
            borderBottom: "1px solid var(--color-sidebar-border)",
          }}
        >
          {collapsed ? <BrandMark size="compact" /> : <BrandLockup size="compact" />}
        </Box>

        <Box component="nav" className="flex-1 overflow-y-auto overflow-x-hidden" sx={{ py: 1 }}>
          {navGroups.map((group, groupIndex) => (
            <Box key={group.title || `group-${groupIndex}`}>
              {collapsed ? (
                groupIndex > 0 && (
                  <Box
                    sx={{
                      height: 1,
                      backgroundColor: "var(--color-sidebar-border)",
                      mx: "14px",
                      my: "10px",
                    }}
                  />
                )
              ) : group.title ? (
                <Box
                  component="p"
                  className="text-nav-group"
                  sx={{
                    m: 0,
                    px: "10px",
                    pt: "12px",
                    pb: "6px",
                  }}
                >
                  {group.title}
                </Box>
              ) : (
                <Box sx={{ height: 8 }} />
              )}

              <Box component="ul" sx={{ listStyle: "none", m: 0, p: "0 8px" }}>
                {group.items.map(({ label, icon, path, badge }) => (
                  <Box component="li" key={path} sx={{ listStyle: "none" }}>
                    <NavItem
                      label={label}
                      icon={icon}
                      path={path}
                      badge={badge}
                      collapsed={collapsed}
                      end={path === "/"}
                    />
                  </Box>
                ))}
              </Box>
            </Box>
          ))}
        </Box>
      </Box>
    </Drawer>
  );
}