import { Card } from '@/ui/Card';
import StatusBadge from '@/components/ui/StatusBadge';
import { Input } from '@/ui/Input';
import { Select } from '@/ui/Select';
import { Table, TableHead, TableBody, TableRow, TableHeader, TableCell } from '@/ui/Table';
import { Button } from '@/ui/Button';
import { Text } from '@/ui/Text';
import {
  Search,
  Filter,
  RefreshCw,
  Users,
  Shield,
  Trash2,
  AlertTriangle
} from 'lucide-react';
import { AdminUsersViewData } from '@/lib/view-data/AdminUsersViewData';

/**
 * AdminUsersTemplate
 * 
 * Pure template for admin users page.
 * Accepts ViewData only, no business logic.
 */
export function AdminUsersTemplate(props: {
  adminUsersViewData: AdminUsersViewData;
  onRefresh: () => void;
  onSearch: (search: string) => void;
  onFilterRole: (role: string) => void;
  onFilterStatus: (status: string) => void;
  onClearFilters: () => void;
  onUpdateStatus: (userId: string, status: string) => void;
  onDeleteUser: (userId: string) => void;
  search: string;
  roleFilter: string;
  statusFilter: string;
  loading: boolean;
  error: string | null;
  deletingUser: string | null;
}) {
  const {
    adminUsersViewData: viewData,
    onRefresh,
    onSearch,
    onFilterRole,
    onFilterStatus,
    onClearFilters,
    onUpdateStatus,
    onDeleteUser,
    search,
    roleFilter,
    statusFilter,
    loading,
    error,
    deletingUser
  } = props;

  const toStatusBadgeProps = (
    status: string,
  ): { status: 'success' | 'warning' | 'error' | 'neutral'; label: string } => {
    switch (status) {
      case 'active':
        return { status: 'success', label: 'Active' };
      case 'suspended':
        return { status: 'warning', label: 'Suspended' };
      case 'deleted':
        return { status: 'error', label: 'Deleted' };
      default:
        return { status: 'neutral', label: status };
    }
  };

  const getRoleBadgeClass = (role: string) => {
    switch (role) {
      case 'owner':
        return 'bg-purple-500/20 text-purple-300 border border-purple-500/30';
      case 'admin':
        return 'bg-blue-500/20 text-blue-300 border border-blue-500/30';
      default:
        return 'bg-gray-500/20 text-gray-300 border border-gray-500/30';
    }
  };

  const getRoleBadgeLabel = (role: string) => {
    switch (role) {
      case 'owner':
        return 'Owner';
      case 'admin':
        return 'Admin';
      case 'user':
        return 'User';
      default:
        return role;
    }
  };

  return (
    <div className="container mx-auto p-6 space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <Text size="2xl" weight="bold" color="text-white">User Management</Text>
          <Text size="sm" color="text-gray-400" className="mt-1">Manage and monitor all system users</Text>
        </div>
        <Button
          onClick={onRefresh}
          disabled={loading}
          variant="secondary"
          className="flex items-center gap-2"
        >
          <RefreshCw className={`w-4 h-4 ${loading ? 'animate-spin' : ''}`} />
          Refresh
        </Button>
      </div>

      {/* Error Banner */}
      {error && (
        <div className="bg-racing-red/10 border border-racing-red text-racing-red px-4 py-3 rounded-lg flex items-start gap-3">
          <AlertTriangle className="w-5 h-5 mt-0.5 flex-shrink-0" />
          <div className="flex-1">
            <Text weight="medium">Error</Text>
            <Text size="sm" className="opacity-90">{error}</Text>
          </div>
          <Button
            onClick={() => {}}
            variant="secondary"
            className="text-racing-red hover:opacity-70 p-0"
          >
            ×
          </Button>
        </div>
      )}

      {/* Filters Card */}
      <Card>
        <div className="space-y-4">
          <div className="flex items-center justify-between">
            <div className="flex items-center gap-2">
              <Filter className="w-4 h-4 text-gray-400" />
              <Text weight="medium" color="text-white">Filters</Text>
            </div>
            {(search || roleFilter || statusFilter) && (
              <Button
                onClick={onClearFilters}
                variant="secondary"
                className="text-xs p-0"
              >
                Clear all
              </Button>
            )}
          </div>
          
          <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
           <div className="relative">
             <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-gray-400" />
             <Input
               type="text"
               placeholder="Search by email or name..."
               value={search}
               onChange={(e) => onSearch(e.target.value)}
               className="pl-9"
             />
           </div>

           <Select
             value={roleFilter}
             onChange={(e) => onFilterRole(e.target.value)}
             options={[
               { value: '', label: 'All Roles' },
               { value: 'owner', label: 'Owner' },
               { value: 'admin', label: 'Admin' },
               { value: 'user', label: 'User' },
             ]}
           />

           <Select
             value={statusFilter}
             onChange={(e) => onFilterStatus(e.target.value)}
             options={[
               { value: '', label: 'All Status' },
               { value: 'active', label: 'Active' },
               { value: 'suspended', label: 'Suspended' },
               { value: 'deleted', label: 'Deleted' },
             ]}
           />
         </div>
        </div>
      </Card>

      {/* Users Table */}
      <Card>
        {loading ? (
          <div className="flex flex-col items-center justify-center py-12 space-y-3">
            <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary-blue"></div>
            <Text color="text-gray-400">Loading users...</Text>
          </div>
        ) : !viewData.users || viewData.users.length === 0 ? (
          <div className="flex flex-col items-center justify-center py-12 space-y-3">
            <Users className="w-12 h-12 text-gray-600" />
            <Text color="text-gray-400">No users found</Text>
            <Button
              onClick={onClearFilters}
              variant="secondary"
              className="text-sm p-0"
            >
              Clear filters
            </Button>
          </div>
        ) : (
          <Table>
            <TableHead>
              <TableRow>
                <TableHeader>User</TableHeader>
                <TableHeader>Email</TableHeader>
                <TableHeader>Roles</TableHeader>
                <TableHeader>Status</TableHeader>
                <TableHeader>Last Login</TableHeader>
                <TableHeader>Actions</TableHeader>
              </TableRow>
            </TableHead>
            <TableBody>
              {viewData.users.map((user, index: number) => (
                <TableRow
                  key={user.id}
                  className={index % 2 === 0 ? 'bg-transparent' : 'bg-iron-gray/10'}
                >
                  <TableCell>
                    <div className="flex items-center gap-3">
                      <div className="w-8 h-8 rounded-full bg-primary-blue/20 flex items-center justify-center">
                        <Shield className="w-4 h-4 text-primary-blue" />
                      </div>
                      <div>
                        <div className="font-medium text-white">{user.displayName}</div>
                        <div className="text-xs text-gray-500">ID: {user.id}</div>
                        {user.primaryDriverId && (
                          <div className="text-xs text-gray-500">Driver: {user.primaryDriverId}</div>
                        )}
                      </div>
                    </div>
                  </TableCell>
                  <TableCell>
                    <div className="text-sm text-gray-300">{user.email}</div>
                  </TableCell>
                  <TableCell>
                    <div className="flex flex-wrap gap-1">
                      {user.roles.map((role: string, idx: number) => (
                        <span
                          key={idx}
                          className={`px-2 py-1 text-xs rounded-full font-medium ${getRoleBadgeClass(role)}`}
                        >
                          {getRoleBadgeLabel(role)}
                        </span>
                      ))}
                    </div>
                  </TableCell>
                  <TableCell>
                    {(() => {
                      const badge = toStatusBadgeProps(user.status);
                      return <StatusBadge status={badge.status} label={badge.label} />;
                    })()}
                  </TableCell>
                  <TableCell>
                    <div className="text-sm text-gray-400">
                      {user.lastLoginAt ? new Date(user.lastLoginAt).toLocaleDateString() : 'Never'}
                    </div>
                  </TableCell>
                  <TableCell>
                    <div className="flex items-center gap-2">
                      {user.status === 'active' && (
                        <Button
                          onClick={() => onUpdateStatus(user.id, 'suspended')}
                          variant="secondary"
                          className="px-3 py-1 text-xs bg-yellow-500/20 text-yellow-300 hover:bg-yellow-500/30"
                        >
                          Suspend
                        </Button>
                      )}
                      {user.status === 'suspended' && (
                        <Button
                          onClick={() => onUpdateStatus(user.id, 'active')}
                          variant="secondary"
                          className="px-3 py-1 text-xs bg-performance-green/20 text-performance-green hover:bg-performance-green/30"
                        >
                          Activate
                        </Button>
                      )}
                      {user.status !== 'deleted' && (
                        <Button
                          onClick={() => onDeleteUser(user.id)}
                          disabled={deletingUser === user.id}
                          variant="secondary"
                          className="px-3 py-1 text-xs bg-racing-red/20 text-racing-red hover:bg-racing-red/30 flex items-center gap-1"
                        >
                          <Trash2 className="w-3 h-3" />
                          {deletingUser === user.id ? 'Deleting...' : 'Delete'}
                        </Button>
                      )}
                    </div>
                  </TableCell>
                </TableRow>
              ))}
            </TableBody>
          </Table>
        )}
      </Card>

      {/* Stats Summary */}
      {viewData.users.length > 0 && (
        <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
          <Card className="bg-gradient-to-br from-blue-900/20 to-blue-700/10">
            <div className="flex items-center justify-between">
              <div>
                <Text size="sm" color="text-gray-400" className="mb-1">Total Users</Text>
                <Text size="2xl" weight="bold" color="text-white">{viewData.total}</Text>
              </div>
              <Users className="w-6 h-6 text-blue-400" />
            </div>
          </Card>
          <Card className="bg-gradient-to-br from-green-900/20 to-green-700/10">
            <div className="flex items-center justify-between">
              <div>
                <Text size="sm" color="text-gray-400" className="mb-1">Active</Text>
                <Text size="2xl" weight="bold" color="text-white">
                  {viewData.activeUserCount}
                </Text>
              </div>
              <div className="w-6 h-6 text-green-400">✓</div>
            </div>
          </Card>
          <Card className="bg-gradient-to-br from-purple-900/20 to-purple-700/10">
            <div className="flex items-center justify-between">
              <div>
                <Text size="sm" color="text-gray-400" className="mb-1">Admins</Text>
                <Text size="2xl" weight="bold" color="text-white">
                  {viewData.adminCount}
                </Text>
              </div>
              <Shield className="w-6 h-6 text-purple-400" />
            </div>
          </Card>
        </div>
      )}
    </div>
  );
}