import React from 'react';
import { Card, CardContent, CardHeader } from '@/components/ui/card';
import { Skeleton } from '@/components/ui/skeleton';

/**
 * Loading skeleton for AssetRequestForm
 */
export const AssetRequestFormSkeleton: React.FC = () => {
  return (
    <Card className="w-full">
      <CardHeader className="pb-4">
        <Skeleton className="h-6 w-48" />
        <Skeleton className="h-4 w-full mt-2" />
      </CardHeader>
      <CardContent className="px-4 sm:px-6 space-y-6">
        {/* Requested Assets Section */}
        <div className="space-y-4">
          <div className="flex items-center justify-between">
            <Skeleton className="h-5 w-40" />
            <Skeleton className="h-9 w-28" />
          </div>
          
          <Card className="border-2">
            <CardContent className="p-4 space-y-4">
              <Skeleton className="h-4 w-16" />
              <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                <div className="space-y-2">
                  <Skeleton className="h-4 w-24" />
                  <Skeleton className="h-10 w-full" />
                </div>
                <div className="space-y-2">
                  <Skeleton className="h-4 w-20" />
                  <Skeleton className="h-10 w-full" />
                </div>
              </div>
              <div className="space-y-2">
                <Skeleton className="h-4 w-32" />
                <Skeleton className="h-20 w-full" />
              </div>
            </CardContent>
          </Card>
        </div>

        {/* Justification */}
        <div className="space-y-2">
          <Skeleton className="h-4 w-28" />
          <Skeleton className="h-32 w-full" />
        </div>

        {/* Form Actions */}
        <div className="flex flex-col-reverse sm:flex-row justify-end gap-3 pt-4">
          <Skeleton className="h-10 w-full sm:w-24" />
          <Skeleton className="h-10 w-full sm:w-36" />
        </div>
      </CardContent>
    </Card>
  );
};

/**
 * Loading skeleton for MyAssetRequests list
 */
export const MyAssetRequestsSkeleton: React.FC = () => {
  return (
    <Card className="w-full">
      <CardHeader>
        <Skeleton className="h-6 w-48" />
        <div className="mt-4">
          <Skeleton className="h-10 w-full" />
        </div>
      </CardHeader>
      <CardContent>
        <div className="space-y-4">
          <Skeleton className="h-10 w-full" />
          
          {[1, 2, 3].map((i) => (
            <Card key={i} className="mb-3">
              <CardHeader className="pb-3">
                <div className="flex items-start justify-between gap-3">
                  <div className="flex-1 space-y-2">
                    <div className="flex items-center gap-2">
                      <Skeleton className="h-5 w-32" />
                      <Skeleton className="h-6 w-20" />
                    </div>
                    <div className="flex gap-3">
                      <Skeleton className="h-4 w-28" />
                      <Skeleton className="h-4 w-24" />
                    </div>
                  </div>
                  <Skeleton className="h-8 w-8" />
                </div>
              </CardHeader>
            </Card>
          ))}
        </div>
      </CardContent>
    </Card>
  );
};

/**
 * Loading skeleton for AssetRequestReview table
 */
export const AssetRequestReviewSkeleton: React.FC = () => {
  return (
    <div className="space-y-4">
      <Card>
        <CardHeader>
          <Skeleton className="h-6 w-56" />
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="flex flex-col sm:flex-row gap-3">
            <Skeleton className="h-10 flex-1" />
            <Skeleton className="h-10 w-full sm:w-48" />
          </div>
        </CardContent>
      </Card>

      <Card>
        <CardContent className="p-0">
          <div className="space-y-3 p-6">
            {[1, 2, 3, 4].map((i) => (
              <div key={i} className="flex items-center gap-4 py-3 border-b last:border-0">
                <div className="flex-1 space-y-2">
                  <Skeleton className="h-5 w-24" />
                  <Skeleton className="h-4 w-32" />
                </div>
                <div className="flex-1 space-y-2">
                  <Skeleton className="h-5 w-40" />
                </div>
                <div className="flex-1 space-y-2">
                  <Skeleton className="h-5 w-32" />
                </div>
                <div className="flex-1 space-y-2">
                  <Skeleton className="h-6 w-28" />
                </div>
                <div className="flex gap-2">
                  <Skeleton className="h-9 w-16" />
                  <Skeleton className="h-9 w-20" />
                  <Skeleton className="h-9 w-20" />
                </div>
              </div>
            ))}
          </div>
        </CardContent>
      </Card>
    </div>
  );
};

/**
 * Loading skeleton for AssetRequestDashboard
 */
export const AssetRequestDashboardSkeleton: React.FC = () => {
  return (
    <div className="space-y-6">
      {/* Summary Statistics */}
      <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
        {[1, 2, 3, 4].map((i) => (
          <Card key={i}>
            <CardContent className="p-6">
              <div className="space-y-2">
                <Skeleton className="h-4 w-24" />
                <Skeleton className="h-8 w-16" />
                <Skeleton className="h-3 w-32" />
              </div>
            </CardContent>
          </Card>
        ))}
      </div>

      {/* Filters */}
      <Card>
        <CardContent className="p-4">
          <div className="flex flex-col sm:flex-row gap-3">
            <Skeleton className="h-10 flex-1" />
            <Skeleton className="h-10 w-full sm:w-40" />
            <Skeleton className="h-10 w-full sm:w-40" />
          </div>
        </CardContent>
      </Card>

      {/* Requests List */}
      <Card>
        <CardContent className="p-6 space-y-3">
          {[1, 2, 3, 4, 5].map((i) => (
            <div key={i} className="flex items-center gap-4 py-3 border-b last:border-0">
              <Skeleton className="h-12 w-12 rounded-full" />
              <div className="flex-1 space-y-2">
                <Skeleton className="h-5 w-48" />
                <Skeleton className="h-4 w-64" />
              </div>
              <Skeleton className="h-6 w-20" />
              <Skeleton className="h-9 w-24" />
            </div>
          ))}
        </CardContent>
      </Card>
    </div>
  );
};

/**
 * Loading skeleton for AssetRequestAssignment
 */
export const AssetRequestAssignmentSkeleton: React.FC = () => {
  return (
    <Card>
      <CardHeader>
        <Skeleton className="h-6 w-56" />
        <Skeleton className="h-4 w-full mt-2" />
      </CardHeader>
      <CardContent className="space-y-6">
        {/* Request Details */}
        <div className="space-y-4">
          <Skeleton className="h-5 w-32" />
          <div className="grid grid-cols-2 gap-4">
            <div className="space-y-2">
              <Skeleton className="h-4 w-20" />
              <Skeleton className="h-5 w-40" />
            </div>
            <div className="space-y-2">
              <Skeleton className="h-4 w-24" />
              <Skeleton className="h-5 w-32" />
            </div>
          </div>
        </div>

        {/* Asset Selection */}
        <div className="space-y-4">
          <Skeleton className="h-5 w-40" />
          {[1, 2].map((i) => (
            <Card key={i} className="border-2">
              <CardContent className="p-4 space-y-3">
                <Skeleton className="h-5 w-32" />
                <Skeleton className="h-10 w-full" />
                <div className="flex gap-2">
                  <Skeleton className="h-9 w-24" />
                  <Skeleton className="h-9 w-24" />
                </div>
              </CardContent>
            </Card>
          ))}
        </div>

        {/* Actions */}
        <div className="flex justify-end gap-3">
          <Skeleton className="h-10 w-24" />
          <Skeleton className="h-10 w-36" />
        </div>
      </CardContent>
    </Card>
  );
};