import React from 'react';
import { useTranslation } from 'react-i18next';
import { Link, useLocation } from 'react-router-dom';
import {
  LayoutDashboard,
  CalendarDays,
  Settings,
  Users,
  CreditCard,
  MessageSquare,
  LogOut,
  ClipboardList,
  Ticket,
  HelpCircle,
  Plug,
  FileSignature,
  CalendarOff,
  Image,
  BarChart3,
  ShoppingCart,
  Package,
} from 'lucide-react';
import { Business, User } from '../types';
import { useLogout } from '../hooks/useAuth';
import { usePlanFeatures } from '../hooks/usePlanFeatures';
import { useEntitlements, FEATURE_CODES } from '../hooks/useEntitlements';
import SmoothScheduleLogo from './SmoothScheduleLogo';
import UnfinishedBadge from './ui/UnfinishedBadge';
import {
  SidebarSection,
  SidebarItem,
  SidebarDivider,
} from './navigation/SidebarComponents';

interface SidebarProps {
  business: Business;
  user: User;
  isCollapsed: boolean;
  toggleCollapse: () => void;
}

const Sidebar: React.FC<SidebarProps> = ({ business, user, isCollapsed, toggleCollapse }) => {
  const { t } = useTranslation();
  const { role } = user;
  const logoutMutation = useLogout();
  const { canUse } = usePlanFeatures();
  const { hasFeature } = useEntitlements();

  // Helper to check if user has a specific staff permission
  // Owners always have all permissions
  // Staff members check their effective_permissions (role + user overrides)
  const hasPermission = (permissionKey: string): boolean => {
    if (role === 'owner') {
      return true;
    }
    if (role === 'staff') {
      // Check effective_permissions which combines user overrides and staff role
      return user.effective_permissions?.[permissionKey] === true;
    }
    return false;
  };

  // Admin/management access is based on effective permissions for staff
  const canViewAdminPages = role === 'owner' || hasPermission('can_access_staff');
  const canViewManagementPages = role === 'owner' || hasPermission('can_access_scheduler');
  const isStaff = role === 'staff';
  const canViewSettings = role === 'owner' || hasPermission('can_access_settings');
  const canViewTickets = hasPermission('can_access_tickets');
  const canSendMessages = hasPermission('can_access_messages') || user.can_send_messages === true;

  const handleSignOut = () => {
    logoutMutation.mutate();
  };

  return (
    <div
      className={`flex flex-col h-full text-brand-text shrink-0 transition-all duration-300 ${isCollapsed ? 'w-20' : 'w-64'}`}
      style={{
        background: `linear-gradient(to bottom right, var(--color-brand-600, ${business.primaryColor}), var(--color-brand-secondary, ${business.secondaryColor || business.primaryColor}))`
      }}
    >
      {/* Header / Logo */}
      <button
        onClick={toggleCollapse}
        className={`flex items-center gap-3 w-full text-left px-6 py-6 ${isCollapsed ? 'justify-center' : ''} hover:bg-white/5 transition-colors focus:outline-none`}
        aria-label={isCollapsed ? t('nav.expandSidebar') : t('nav.collapseSidebar')}
      >
        {business.logoDisplayMode === 'logo-only' && business.logoUrl ? (
          <div className="flex items-center justify-center w-full">
            <img
              src={business.logoUrl}
              alt={business.name}
              className="max-w-full max-h-12 object-contain"
            />
          </div>
        ) : (
          <>
            {business.logoUrl && business.logoDisplayMode !== 'text-only' ? (
              <div className="flex items-center justify-center w-10 h-10 shrink-0">
                <img
                  src={business.logoUrl}
                  alt={business.name}
                  className="w-full h-full object-contain"
                />
              </div>
            ) : business.logoDisplayMode !== 'logo-only' && (
              <div
                className="flex items-center justify-center w-10 h-10 bg-white rounded-lg font-bold text-xl shrink-0"
                style={{ color: 'var(--color-brand-600)' }}
              >
                {business.name.substring(0, 2).toUpperCase()}
              </div>
            )}
            {!isCollapsed && business.logoDisplayMode !== 'logo-only' && (
              <div className="overflow-hidden">
                <h1 className="font-bold leading-tight truncate">{business.name}</h1>
                <p className="text-xs text-brand-text/60 truncate">{business.subdomain}.smoothschedule.com</p>
              </div>
            )}
          </>
        )}
      </button>

      {/* Navigation */}
      <nav className="flex-1 px-3 space-y-6 overflow-y-auto pb-4">
        {/* Analytics Section - Dashboard and Payments */}
        <SidebarSection title={t('nav.sections.analytics', 'Analytics')} isCollapsed={isCollapsed}>
          <SidebarItem
            to="/dashboard"
            icon={LayoutDashboard}
            label={t('nav.dashboard')}
            isCollapsed={isCollapsed}
            exact
          />
          {hasPermission('can_access_payments') && (
            <SidebarItem
              to="/dashboard/payments"
              icon={CreditCard}
              label={t('nav.payments')}
              isCollapsed={isCollapsed}
              disabled={!business.paymentsEnabled && role !== 'owner'}
            />
          )}
        </SidebarSection>

        {/* Point of Sale Section - Requires tenant feature AND user permission */}
        {hasFeature(FEATURE_CODES.CAN_USE_POS) && hasPermission('can_access_pos') && (
          <SidebarSection title={t('nav.sections.pos', 'Point of Sale')} isCollapsed={isCollapsed}>
            <SidebarItem
              to="/dashboard/pos"
              icon={ShoppingCart}
              label={t('nav.pos', 'Point of Sale')}
              isCollapsed={isCollapsed}
            />
            <SidebarItem
              to="/dashboard/products"
              icon={Package}
              label={t('nav.products', 'Products')}
              isCollapsed={isCollapsed}
            />
          </SidebarSection>
        )}

        {/* Staff-only: My Schedule and My Availability */}
        {((isStaff && hasPermission('can_access_my_schedule')) ||
          ((role === 'staff' || role === 'resource') && hasPermission('can_access_my_availability'))) && (
          <SidebarSection isCollapsed={isCollapsed}>
            {(isStaff && hasPermission('can_access_my_schedule')) && (
              <SidebarItem
                to="/dashboard/my-schedule"
                icon={CalendarDays}
                label={t('nav.mySchedule', 'My Schedule')}
                isCollapsed={isCollapsed}
              />
            )}
            {(role === 'staff' || role === 'resource') && hasPermission('can_access_my_availability') && (
              <SidebarItem
                to="/dashboard/my-availability"
                icon={CalendarOff}
                label={t('nav.myAvailability', 'My Availability')}
                isCollapsed={isCollapsed}
              />
            )}
          </SidebarSection>
        )}

        {/* Manage Section - Scheduler, Resources, Staff, Customers, Contracts, Time Blocks */}
        {(hasPermission('can_access_scheduler') ||
          hasPermission('can_access_resources') ||
          hasPermission('can_access_staff') ||
          hasPermission('can_access_customers') ||
          hasPermission('can_access_contracts') ||
          hasPermission('can_access_time_blocks') ||
          hasPermission('can_access_gallery')
        ) && (
          <SidebarSection title={t('nav.sections.manage', 'Manage')} isCollapsed={isCollapsed}>
            {hasPermission('can_access_scheduler') && (
              <SidebarItem
                to="/dashboard/scheduler"
                icon={CalendarDays}
                label={t('nav.scheduler')}
                isCollapsed={isCollapsed}
              />
            )}
            {hasPermission('can_access_resources') && (
              <SidebarItem
                to="/dashboard/resources"
                icon={ClipboardList}
                label={t('nav.resources')}
                isCollapsed={isCollapsed}
              />
            )}
            {hasPermission('can_access_staff') && (
              <SidebarItem
                to="/dashboard/staff"
                icon={Users}
                label={t('nav.staff')}
                isCollapsed={isCollapsed}
              />
            )}
            {hasPermission('can_access_customers') && (
              <SidebarItem
                to="/dashboard/customers"
                icon={Users}
                label={t('nav.customers')}
                isCollapsed={isCollapsed}
              />
            )}
            {hasPermission('can_access_gallery') && (
              <SidebarItem
                to="/dashboard/gallery"
                icon={Image}
                label={t('nav.gallery', 'Media Gallery')}
                isCollapsed={isCollapsed}
              />
            )}
            {hasPermission('can_access_contracts') && canUse('contracts') && (
              <SidebarItem
                to="/dashboard/contracts"
                icon={FileSignature}
                label={t('nav.contracts', 'Contracts')}
                isCollapsed={isCollapsed}
                badgeElement={<UnfinishedBadge />}
              />
            )}
            {hasPermission('can_access_time_blocks') && (
              <SidebarItem
                to="/dashboard/time-blocks"
                icon={CalendarOff}
                label={t('nav.timeBlocks', 'Time Blocks')}
                isCollapsed={isCollapsed}
              />
            )}
          </SidebarSection>
        )}

        {/* Communicate Section - Messages + Tickets */}
        {(canSendMessages || canViewTickets) && (
          <SidebarSection title={t('nav.sections.communicate', 'Communicate')} isCollapsed={isCollapsed}>
            {canSendMessages && (
              <SidebarItem
                to="/dashboard/messages"
                icon={MessageSquare}
                label={t('nav.messages')}
                isCollapsed={isCollapsed}
              />
            )}
            {canViewTickets && (
              <SidebarItem
                to="/dashboard/tickets"
                icon={Ticket}
                label={t('nav.tickets')}
                isCollapsed={isCollapsed}
              />
            )}
          </SidebarSection>
        )}

        {/* Extend Section - Automations */}
        {hasPermission('can_access_automations') && (
          <SidebarSection title={t('nav.sections.extend', 'Extend')} isCollapsed={isCollapsed}>
            <SidebarItem
              to="/dashboard/automations"
              icon={Plug}
              label={t('nav.automations', 'Automations')}
              isCollapsed={isCollapsed}
              locked={!canUse('automations')}
              badgeElement={<UnfinishedBadge />}
            />
          </SidebarSection>
        )}

        {/* Footer Section - Settings & Help */}
        <SidebarDivider isCollapsed={isCollapsed} />

        <SidebarSection isCollapsed={isCollapsed}>
          {canViewSettings && (
            <SidebarItem
              to="/dashboard/settings"
              icon={Settings}
              label={t('nav.businessSettings')}
              isCollapsed={isCollapsed}
            />
          )}
          <SidebarItem
            to="/dashboard/help"
            icon={HelpCircle}
            label={t('nav.helpDocs', 'Help & Docs')}
            isCollapsed={isCollapsed}
          />
        </SidebarSection>
      </nav>

      {/* User Section */}
      <div className="p-4 border-t border-brand-text/10">
        <a
          href={`${window.location.protocol}//${window.location.host.split('.').slice(-2).join('.')}`}
          target="_blank"
          rel="noopener noreferrer"
          className={`flex items-center gap-2 text-xs text-brand-text/60 mb-3 hover:text-brand-text/80 transition-colors ${isCollapsed ? 'justify-center' : ''}`}
        >
          <SmoothScheduleLogo className="w-5 h-5 text-brand-text" />
          {!isCollapsed && (
            <span className="text-brand-text/60">{t('nav.smoothSchedule')}</span>
          )}
        </a>
        <button
          onClick={handleSignOut}
          disabled={logoutMutation.isPending}
          className={`flex items-center gap-3 px-3 py-2 text-sm font-medium text-brand-text/70 hover:text-brand-text hover:bg-brand-text/5 w-full transition-colors rounded-lg ${isCollapsed ? 'justify-center' : ''} disabled:opacity-50`}
        >
          <LogOut size={18} className="shrink-0" />
          {!isCollapsed && <span>{t('auth.signOut')}</span>}
        </button>
      </div>
    </div>
  );
};

export default Sidebar;