import { X, User, ShieldCheck, Loader2 } from 'lucide-react';
import { toast } from 'sonner';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Select } from '@/components/ui/select';
import { Button } from '@/components/ui/button';
import { Skeleton } from '@/components/ui/skeleton';
import { useAdminUserDetail, useUpdateRole, getErrorMessage } from '@/hooks/useAdmin';
import { getRelativeTime } from '@/lib/date-utils';
import { cn } from '@/lib/utils';
import type { UserRole } from '@/types';

interface UserDetailSectionProps {
  userId: number;
  onClose: () => void;
}

function DetailRow({ label, value }: { label: string; value: React.ReactNode }) {
  return (
    <div className="flex items-start justify-between gap-3 py-1.5">
      <span className="text-xs text-muted-foreground shrink-0">{label}</span>
      <span className="text-xs text-foreground text-right">{value || '—'}</span>
    </div>
  );
}

function StatusBadge({ active }: { active: boolean }) {
  return (
    <span
      className={cn(
        'text-[9px] px-1.5 py-0.5 rounded font-medium uppercase tracking-wide',
        active ? 'bg-green-500/15 text-green-400' : 'bg-red-500/15 text-red-400'
      )}
    >
      {active ? 'Active' : 'Disabled'}
    </span>
  );
}

function MfaBadge({ enabled, pending }: { enabled: boolean; pending: boolean }) {
  if (enabled) {
    return (
      <span className="text-[9px] px-1.5 py-0.5 rounded font-medium uppercase tracking-wide bg-green-500/15 text-green-400">
        Enabled
      </span>
    );
  }
  if (pending) {
    return (
      <span className="text-[9px] px-1.5 py-0.5 rounded font-medium uppercase tracking-wide bg-orange-500/15 text-orange-400">
        Pending
      </span>
    );
  }
  return <span className="text-xs text-muted-foreground">Off</span>;
}

export default function UserDetailSection({ userId, onClose }: UserDetailSectionProps) {
  const { data: user, isLoading, error } = useAdminUserDetail(userId);
  const updateRole = useUpdateRole();

  const handleRoleChange = async (newRole: UserRole) => {
    if (!user || newRole === user.role) return;
    try {
      await updateRole.mutateAsync({ userId: user.id, role: newRole });
      toast.success(`Role updated to "${newRole}"`);
    } catch (err) {
      toast.error(getErrorMessage(err, 'Failed to update role'));
    }
  };

  if (isLoading) {
    return (
      <div className="grid grid-cols-4 gap-4">
        <Card className="col-span-1">
          <CardContent className="p-5 space-y-3">
            {Array.from({ length: 5 }).map((_, i) => (
              <Skeleton key={i} className="h-5 w-full" />
            ))}
          </CardContent>
        </Card>
        <Card className="col-span-1">
          <CardContent className="p-5 space-y-3">
            {Array.from({ length: 7 }).map((_, i) => (
              <Skeleton key={i} className="h-5 w-full" />
            ))}
          </CardContent>
        </Card>
      </div>
    );
  }

  if (error) {
    return (
      <Card>
        <CardContent className="p-5">
          <div className="flex items-center justify-between">
            <p className="text-sm text-destructive">Failed to load user details</p>
            <Button variant="ghost" size="sm" className="h-6 w-6 p-0" onClick={onClose}>
              <X className="h-3.5 w-3.5" />
            </Button>
          </div>
          <p className="text-xs text-muted-foreground mt-1">{error.message}</p>
        </CardContent>
      </Card>
    );
  }

  if (!user) return null;

  return (
    <div className="grid grid-cols-4 gap-4">
      {/* User Information (read-only) */}
      <Card className="col-span-1">
        <CardHeader className="flex-row items-center justify-between pb-3">
          <div className="flex items-center gap-2">
            <div className="p-1.5 rounded-md bg-accent/10">
              <User className="h-3.5 w-3.5 text-accent" />
            </div>
            <CardTitle className="text-sm">User Information</CardTitle>
          </div>
          <Button
            variant="ghost"
            size="sm"
            className="h-6 w-6 p-0"
            onClick={onClose}
          >
            <X className="h-3.5 w-3.5" />
          </Button>
        </CardHeader>
        <CardContent className="pt-0 space-y-0.5">
          <DetailRow label="Username" value={user.username} />
          <DetailRow label="First Name" value={user.first_name} />
          <DetailRow label="Last Name" value={user.last_name} />
          <DetailRow label="Email" value={user.email} />
          <DetailRow label="Preferred Name" value={user.preferred_name} />
          <DetailRow
            label="Date of Birth"
            value={user.date_of_birth ? (() => {
              const dob = new Date(user.date_of_birth + 'T00:00:00');
              const now = new Date();
              let age = now.getFullYear() - dob.getFullYear();
              if (now.getMonth() < dob.getMonth() || (now.getMonth() === dob.getMonth() && now.getDate() < dob.getDate())) age--;
              return `${dob.toLocaleDateString()} (${age})`;
            })() : null}
          />
          <DetailRow
            label="Created"
            value={getRelativeTime(user.created_at)}
          />
        </CardContent>
      </Card>

      {/* Security & Permissions */}
      <Card className="col-span-1">
        <CardHeader className="pb-3">
          <div className="flex items-center gap-2">
            <div className="p-1.5 rounded-md bg-accent/10">
              <ShieldCheck className="h-3.5 w-3.5 text-accent" />
            </div>
            <CardTitle className="text-sm">Security & Permissions</CardTitle>
          </div>
        </CardHeader>
        <CardContent className="pt-0 space-y-0.5">
          <div className="flex items-center justify-between gap-3 py-1.5">
            <span className="text-xs text-muted-foreground shrink-0">Role</span>
            <div className="flex items-center gap-1.5">
              <Select
                value={user.role}
                onChange={(e) => handleRoleChange(e.target.value as UserRole)}
                className="h-6 text-xs py-0 px-1.5 w-auto min-w-[120px]"
                disabled={updateRole.isPending}
              >
                <option value="admin">Admin</option>
                <option value="standard">Standard</option>
                <option value="public_event_manager">Pub. Events</option>
              </Select>
              {updateRole.isPending && (
                <Loader2 className="h-3 w-3 animate-spin text-muted-foreground" />
              )}
            </div>
          </div>
          <DetailRow
            label="Account Status"
            value={<StatusBadge active={user.is_active} />}
          />
          <DetailRow
            label="MFA Status"
            value={
              <MfaBadge
                enabled={user.totp_enabled}
                pending={user.mfa_enforce_pending}
              />
            }
          />
          <DetailRow
            label="Must Change Pwd"
            value={user.must_change_password ? 'Yes' : 'No'}
          />
          <DetailRow
            label="Active Sessions"
            value={String(user.active_sessions)}
          />
          <DetailRow
            label="Last Login"
            value={user.last_login_at ? getRelativeTime(user.last_login_at) : null}
          />
          <DetailRow
            label="Last Pwd Change"
            value={
              user.last_password_change_at
                ? getRelativeTime(user.last_password_change_at)
                : null
            }
          />
          <DetailRow
            label="Locked Until"
            value={user.locked_until ?? null}
          />
        </CardContent>
      </Card>
    </div>
  );
}