import { Card, CardContent, CardDescription, CardEyebrow, CardHeader, CardTitle } from "@/components/ui/card";
import { EmptyState } from "@/components/ui/empty-state";
import { StatusBadge } from "@/components/ui/status-badge";
import type { AssetViewModel, OrderDetailVM } from "@/lib/types/view-models";

type ReviewImagePanelProps = {
  error: string | null;
  isLoading: boolean;
  order: OrderDetailVM | null;
  selectedAssetId: number | null;
  onSelectAsset: (assetId: number) => void;
};

function joinClasses(...values: Array<string | false | null | undefined>) {
  return values.filter(Boolean).join(" ");
}

function collectAssets(order: OrderDetailVM): AssetViewModel[] {
  const uniqueAssets = new Map<number, AssetViewModel>();

  if (order.finalAsset) {
    uniqueAssets.set(order.finalAsset.id, order.finalAsset);
  }

  for (const asset of order.assets) {
    uniqueAssets.set(asset.id, asset);
  }

  return Array.from(uniqueAssets.values());
}

export function ReviewImagePanel({
  error,
  isLoading,
  order,
  selectedAssetId,
  onSelectAsset,
}: ReviewImagePanelProps) {
  if (isLoading) {
    return (
      <Card className="h-full">
        <CardContent className="px-6 py-8 text-sm text-[var(--ink-muted)]">
          正在加载订单详情与预览资产…
        </CardContent>
      </Card>
    );
  }

  if (error) {
    return (
      <Card className="h-full">
        <CardContent className="px-6 py-8">
          <div className="rounded-[24px] border border-[#b88472] bg-[#f8ece5] px-5 py-4 text-sm text-[#7f4b3b]">
            {error}
          </div>
        </CardContent>
      </Card>
    );
  }

  if (!order) {
    return (
      <Card className="h-full">
        <CardContent className="px-6 py-8">
          <EmptyState
            eyebrow="No active order"
            title="选择一个待审核订单"
            description="左侧队列选中订单后，这里会展示当前审核所需的结果图和过程资产。"
          />
        </CardContent>
      </Card>
    );
  }

  const assets = collectAssets(order);
  const selectedAsset =
    assets.find((asset) => asset.id === selectedAssetId) ??
    order.finalAsset ??
    assets[0] ??
    null;
  const emptyStateTitle =
    order.finalAssetState.kind === "business-empty"
      ? order.finalAssetState.title
      : "暂无可用预览";
  const emptyStateDescription =
    order.finalAssetState.kind === "business-empty"
      ? order.finalAssetState.description
      : "当前订单还没有能用于审核的结果图或过程资产。";

  return (
    <Card className="h-full">
      <CardHeader className="gap-4">
        <div className="flex flex-wrap items-start justify-between gap-4">
          <div className="space-y-2">
            <CardEyebrow>Review target</CardEyebrow>
            <div className="space-y-1">
              <CardTitle>订单 #{order.orderId}</CardTitle>
              <CardDescription>
                当前服务模式为 {order.serviceMode}，步骤停留在 {order.currentStepLabel}。
              </CardDescription>
            </div>
          </div>
          <div className="flex flex-wrap gap-2">
            <StatusBadge status={order.status} />
            <StatusBadge variant="workflowStep" status={order.currentStep} />
          </div>
        </div>
      </CardHeader>
      <CardContent className="space-y-6">
        {selectedAsset ? (
          <div className="rounded-[28px] border border-[var(--border-soft)] bg-[linear-gradient(180deg,rgba(250,247,242,0.96),rgba(238,231,221,0.92))] p-5">
            <div className="flex min-h-[320px] items-center justify-center rounded-[22px] border border-dashed border-[var(--border-strong)] bg-[rgba(255,255,255,0.55)] p-6 text-center">
              <div className="space-y-3">
                <p className="font-[var(--font-mono)] text-[11px] uppercase tracking-[0.22em] text-[var(--ink-faint)]">
                  {selectedAsset.isMock ? "Mock preview asset" : "Preview asset"}
                </p>
                <h3 className="text-xl font-semibold tracking-[-0.02em] text-[var(--ink-strong)]">
                  {selectedAsset.label}
                </h3>
                <p className="mx-auto max-w-lg text-sm leading-7 text-[var(--ink-muted)]">
                  当前阶段优先保证审核流程可用，因此预览面板直接展示资产信息卡；真实图片 URI 可在后续 Task 7 的详情页复用。
                </p>
                <code className="inline-flex rounded-full bg-[rgba(74,64,53,0.08)] px-4 py-2 text-xs text-[var(--ink-muted)]">
                  {selectedAsset.uri}
                </code>
              </div>
            </div>
          </div>
        ) : (
          <EmptyState
            eyebrow="Asset empty"
            title={emptyStateTitle}
            description={emptyStateDescription}
          />
        )}

        {order.hasMockAssets ? (
          <div className="rounded-[24px] border border-[rgba(145,104,46,0.2)] bg-[rgba(202,164,97,0.12)] px-5 py-4 text-sm text-[#7a5323]">
            当前订单包含 mock 资产，审核结论仅用于前后台联调，不代表真实生产结果。
          </div>
        ) : null}

        {assets.length ? (
          <div className="grid gap-3 md:grid-cols-2 xl:grid-cols-3">
            {assets.map((asset) => {
              const isSelected = asset.id === selectedAsset?.id;

              return (
                <button
                  key={asset.id}
                  type="button"
                  onClick={() => onSelectAsset(asset.id)}
                  className={joinClasses(
                    "rounded-[24px] border px-4 py-4 text-left transition duration-150",
                    isSelected
                      ? "border-[var(--accent-primary)] bg-[rgba(110,127,82,0.09)]"
                      : "border-[var(--border-soft)] bg-[var(--surface-muted)] hover:bg-[var(--surface)]",
                  )}
                >
                  <div className="flex items-start justify-between gap-3">
                    <div className="space-y-1">
                      <p className="text-sm font-semibold text-[var(--ink-strong)]">
                        {asset.label}
                      </p>
                      <p className="text-xs text-[var(--ink-muted)]">{asset.stepLabel}</p>
                    </div>
                    {asset.isMock ? (
                      <span className="rounded-full bg-[rgba(145,104,46,0.12)] px-2.5 py-1 font-[var(--font-mono)] text-[11px] uppercase tracking-[0.18em] text-[#7a5323]">
                        Mock
                      </span>
                    ) : null}
                  </div>
                </button>
              );
            })}
          </div>
        ) : null}
      </CardContent>
    </Card>
  );
}