import React, { useMemo } from 'react';
import type { CSSProperties } from 'react';
import { theme } from '../theme/index';
import icLauncher from '../assets/ic_launcher_foreground.png';

export interface SidebarNavItem {
  id: string;
  label: string;
  icon: React.ReactNode;
  badge?: number;
}

interface SidebarNavProps {
  items: SidebarNavItem[];
  footerItems?: SidebarNavItem[];
  activeId: string;
  collapsed?: boolean;
  onSelect: (id: string) => void;
  onToggleCollapse?: (collapsed: boolean) => void;
  variant?: 'desktop' | 'mobile';
}

const SidebarNav: React.FC<SidebarNavProps> = ({
  items,
  footerItems,
  activeId,
  collapsed = false,
  onSelect,
  onToggleCollapse,
  variant = 'desktop',
}) => {
  const containerStyles: CSSProperties = useMemo(
    () => ({
      width: collapsed ? '92px' : '280px',
      transition: 'width 240ms ease',
      background: 'linear-gradient(180deg, rgba(4, 24, 21, 0.98) 0%, rgba(6, 35, 31, 0.95) 100%)',
      borderRight: variant === 'desktop' ? `1px solid rgba(203, 169, 81, 0.15)` : undefined,
      padding: collapsed ? '28px 12px 24px' : '28px 20px 24px',
      display: 'flex',
      flexDirection: 'column',
      gap: theme.spacing.md,
      height: variant === 'desktop' ? '100vh' : '100%',
      position: variant === 'desktop' ? 'sticky' : 'relative',
      top: variant === 'desktop' ? 0 : undefined,
      backdropFilter: 'blur(16px)',
      boxShadow: variant === 'mobile' ? theme.shadows.xl : 'none',
      zIndex: variant === 'mobile' ? theme.zIndex.modal : theme.zIndex.sticky,
    }),
    [collapsed, variant],
  );

  const headerStyles: CSSProperties = useMemo(
    () => ({
      display: 'flex',
      alignItems: 'center',
      gap: theme.spacing.md,
      paddingBottom: theme.spacing.lg,
      borderBottom: `1px solid rgba(203, 169, 81, 0.12)`,
    }),
    [],
  );

  const logoStyles: CSSProperties = {
    width: '48px',
    height: '48px',
    borderRadius: theme.borderRadius.sm,
    backgroundColor: 'rgba(203, 169, 81, 0.12)',
    display: 'flex',
    alignItems: 'center',
    justifyContent: 'center',
    boxShadow: 'inset 0 0 0 1px rgba(203, 169, 81, 0.2)',
  };

  const logoTextStyles: CSSProperties = {
    ...theme.typography.h4,
    color: theme.colors.textPrimary,
  };

  const navListStyles: CSSProperties = useMemo(
    () => ({
      display: 'flex',
      flexDirection: 'column',
      gap: '2px',
      flex: 1,
      overflowY: 'auto',
      paddingRight: collapsed ? 0 : '8px',
      marginTop: theme.spacing.sm,
    }),
    [collapsed],
  );

  const footerStyles: CSSProperties = {
    marginTop: 'auto',
    paddingTop: theme.spacing.lg,
    display: 'flex',
    flexDirection: 'column',
    gap: '2px',
  };

  const dividerStyles: CSSProperties = {
    height: '1px',
    background: 'linear-gradient(90deg, transparent 0%, rgba(203, 169, 81, 0.3) 50%, transparent 100%)',
    marginBottom: theme.spacing.sm,
  };

  return (
    <aside style={containerStyles}>
      <div style={headerStyles}>
        <div style={logoStyles}>
          <img
            src={icLauncher}
            alt="Pennyzo"
            style={{ width: '60%', height: '60%', objectFit: 'contain' }}
          />
        </div>
        {!collapsed && <span style={logoTextStyles}>Pennyzo</span>}
        {variant === 'desktop' && onToggleCollapse && (
          <button
            onClick={() => onToggleCollapse(!collapsed)}
            aria-label={collapsed ? 'Expand navigation' : 'Collapse navigation'}
            style={{
              marginLeft: 'auto',
              width: '36px',
              height: '36px',
              borderRadius: theme.borderRadius.md,
              border: `1px solid rgba(203, 169, 81, 0.25)`,
              backgroundColor: 'rgba(203, 169, 81, 0.08)',
              color: theme.colors.highlight,
              display: 'flex',
              alignItems: 'center',
              justifyContent: 'center',
              cursor: 'pointer',
              transition: 'all 180ms ease',
              fontSize: '18px',
              fontWeight: 'bold',
            }}
          >
            {collapsed ? '»' : '«'}
          </button>
        )}
      </div>

      {/* Decorative divider - works in both collapsed and expanded states */}
      <div style={{ 
        height: '1px',
        background: 'linear-gradient(90deg, transparent 0%, rgba(203, 169, 81, 0.3) 50%, transparent 100%)',
        marginTop: theme.spacing.md,
        marginBottom: theme.spacing.sm,
      }} />

      <nav 
        style={navListStyles}
        className="custom-scrollbar pennyzo-scroll"
      >
        {items.map((item) => {
          const isActive = activeId === item.id;
          return (
            <button
              key={item.id}
              type="button"
              onClick={() => onSelect(item.id)}
              className={`nav-item ${isActive ? 'nav-item-active' : 'nav-item-inactive'} pennyzo-transition`}
              aria-label={item.label}
              title={collapsed ? item.label : undefined}
            >
              {isActive && <div className="nav-item-indicator" />}
              <div className={`nav-icon ${isActive ? 'nav-icon-active' : 'nav-icon-inactive'}`}>
                {item.icon}
              </div>
              {!collapsed && (
                <div style={{ flex: 1, display: 'flex', alignItems: 'center', gap: theme.spacing.sm }}>
                  <span className={`nav-label ${isActive ? 'nav-label-active' : 'nav-label-inactive'}`}>
                    {item.label}
                  </span>
                  {item.badge && item.badge > 0 && (
                    <span className="pennyzo-badge">{item.badge > 99 ? '99+' : item.badge}</span>
                  )}
                </div>
              )}
            </button>
          );
        })}
      </nav>

      {footerItems && footerItems.length > 0 && (
        <div style={footerStyles}>
          {/* Footer divider */}
          <div style={dividerStyles} />
          
          {footerItems.map((item) => {
            const isActive = activeId === item.id;
            return (
              <button
                key={item.id}
                type="button"
                onClick={() => onSelect(item.id)}
                className={`nav-item ${isActive ? 'nav-item-active' : 'nav-item-inactive'} pennyzo-transition`}
                aria-label={item.label}
                title={collapsed ? item.label : undefined}
              >
                {isActive && <div className="nav-item-indicator" />}
                <div className={`nav-icon ${isActive ? 'nav-icon-active' : 'nav-icon-inactive'}`}>
                  {item.icon}
                </div>
                {!collapsed && (
                  <span className={`nav-label ${isActive ? 'nav-label-active' : 'nav-label-inactive'}`}>
                    {item.label}
                  </span>
                )}
              </button>
            );
          })}
        </div>
      )}
    </aside>
  );
};

export default SidebarNav;