xiaoxia-saas/apps/web/src/pages/generate/components/Step4GeneratePreview.tsx

/**
 * Step 4 生成预览组件（支持多预览）
 * 调用后端预览生成接口，展示多个真实视频预览（网格布局）
 */
import React from "react"
import {
  CheckCircleFilled,
  LoadingOutlined,
  ReloadOutlined,
  PlayCircleOutlined,
  ExclamationCircleFilled,
  ClockCircleOutlined,
} from "@ant-design/icons"
import { InputNumber } from "antd"
import type { PreviewItem, PreviewStatus } from "../hooks/useStep4Preview"

interface Step4GeneratePreviewProps {
  templateName: string
  materialCount: string
  duration: number
  videoRatio: string
  previewCount: number
  onPreviewCountChange: (count: number) => void
  items: PreviewItem[]
  selectedIndex: number
  onSelectPreview: (index: number) => void
  overallStatus: PreviewStatus
  overallError: string
  overallProgress: number
  anyGenerating: boolean
  onGeneratePreview: () => void
  onRegeneratePreview: () => void
}

/** 预览数量选项 */
const PREVIEW_COUNT_OPTIONS = [
  { value: 1, label: "1个" },
  { value: 2, label: "2个" },
  { value: 3, label: "3个" },
]

const Step4GeneratePreview: React.FC<Step4GeneratePreviewProps> = ({
  templateName: _templateName,
  materialCount: _materialCount,
  videoRatio,
  previewCount,
  onPreviewCountChange,
  items,
  selectedIndex,
  onSelectPreview,
  overallStatus,
  overallError,
  overallProgress,
  anyGenerating,
  onGeneratePreview,
  onRegeneratePreview,
}) => {
  const aspectRatio = (videoRatio || "16:9").replace(":", "/") // "9:16" → "9/16", "16:9" → "16/9"
  const isIdle = overallStatus === "idle"
  const isError = overallStatus === "error" && !items.some((it) => it.status === "ready")

  return (
    <div className="xx-form-section">
      <h3>🎬 生成预览</h3>

      {/* 预览数量选择器（仅在 idle 状态显示） */}
      {isIdle && (
        <div style={{ marginBottom: 16, display: "flex", alignItems: "center", gap: 12 }}>
          <span style={{ fontSize: 14, color: "#666" }}>预览数量：</span>
          <div style={{ display: "flex", gap: 8, alignItems: "center" }}>
            {PREVIEW_COUNT_OPTIONS.map((opt) => (
              <button
                key={opt.value}
                type="button"
                onClick={() => onPreviewCountChange(opt.value)}
                style={{
                  padding: "4px 12px",
                  borderRadius: 6,
                  border: previewCount === opt.value ? "1px solid #1677ff" : "1px solid #d9d9d9",
                  background: previewCount === opt.value ? "#e6f4ff" : "#fff",
                  color: previewCount === opt.value ? "#1677ff" : "#666",
                  cursor: "pointer",
                  fontSize: 13,
                  fontWeight: previewCount === opt.value ? 600 : 400,
                }}
              >
                {opt.label}
              </button>
            ))}
            <InputNumber
              min={1}
              max={10}
              value={previewCount}
              onChange={(val) => val && onPreviewCountChange(val)}
              style={{ width: 70 }}
              placeholder="自定义"
            />
            <span style={{ fontSize: 12, color: "#999", marginLeft: 4 }}>（1~10）</span>
          </div>
          {previewCount > 1 && (
            <span style={{ fontSize: 12, color: "#999" }}>生成多个预览可对比不同剪辑效果</span>
          )}
        </div>
      )}

      {/* 预览生成按钮（idle 状态） */}
      {isIdle && (
        <div className="xx-preview-generate-section">
          <div className="xx-preview-generate-hint">
            <PlayCircleOutlined style={{ fontSize: 32, color: "#3b82f6", marginBottom: 12 }} />
            <p className="xx-preview-generate-title">一键生成剪辑预览</p>
            <p className="xx-preview-generate-desc">
              AI 将根据您选择的模板、素材和配音，智能生成
              {previewCount > 1 ? `${previewCount}个不同版本的` : ""}视频预览（480p 低清版）
            </p>
          </div>
          <button
            className="xx-btn xx-btn-primary xx-preview-generate-btn"
            onClick={onGeneratePreview}
          >
            ✨ 生成预览{previewCount > 1 ? `（${previewCount}个）` : ""}
          </button>
        </div>
      )}

      {/* 整体排队中（所有都在 pending） */}
      {anyGenerating && items.every((it) => it.status === "pending") && (
        <div className="xx-preview-loading">
          <ClockCircleOutlined style={{ fontSize: 32, color: "#faad14" }} spin />
          <p className="xx-preview-loading-text">预览排队中...</p>
          <p className="xx-preview-loading-desc">正在等待渲染资源，请稍候</p>
        </div>
      )}

      {/* 多预览网格（生成中/完成/部分完成） */}
      {(anyGenerating || overallStatus === "ready") && items.length > 0 && (
        <div
          className="xx-preview-grid"
          style={{
            display: "grid",
            gridTemplateColumns: `repeat(${Math.min(items.length, 3)}, 1fr)`,
            gap: 12,
            maxWidth: `${Math.min(items.length, 3) * 280 + (Math.min(items.length, 3) - 1) * 12}px`,
            margin: "0 auto 16px",
          }}
        >
          {items.map((item) => {
            const isSelected = item.index === selectedIndex
            return (
              <div
                key={item.index}
                onClick={() => {
                  if (item.status === "ready") onSelectPreview(item.index)
                }}
                style={{
                  borderRadius: 8,
                  border: isSelected ? "2px solid #1677ff" : "1px solid #e8e8e8",
                  overflow: "hidden",
                  cursor: item.status === "ready" ? "pointer" : "default",
                  opacity: item.status === "error" ? 0.6 : 1,
                  transition: "all 0.2s",
                }}
              >
                {/* 缩略图/状态区域 */}
                <div
                  style={{
                    aspectRatio,
                    background: "#000",
                    display: "flex",
                    alignItems: "center",
                    justifyContent: "center",
                    position: "relative",
                  }}
                >
                  {item.status === "ready" && item.result && (
                    <video
                      src={item.result.videoUrl}
                      controls
                      autoPlay
                      muted
                      loop
                      preload="metadata"
                      style={{
                        width: "100%",
                        height: "100%",
                        objectFit: "cover",
                      }}
                    />
                  )}
                  {(item.status === "pending" || item.status === "generating") && (
                    <div style={{ textAlign: "center" }}>
                      <LoadingOutlined style={{ fontSize: 24, color: "#fff" }} spin />
                      <p style={{ color: "rgba(255,255,255,0.8)", fontSize: 12, marginTop: 8 }}>
                        {item.status === "pending" ? "排队中..." : `生成中 ${item.progress}%`}
                      </p>
                    </div>
                  )}
                  {item.status === "error" && (
                    <div style={{ textAlign: "center", padding: 8 }}>
                      <ExclamationCircleFilled style={{ fontSize: 20, color: "#ef4444" }} />
                      <p
                        style={{
                          color: "rgba(255,255,255,0.7)",
                          fontSize: 11,
                          marginTop: 4,
                        }}
                      >
                        生成失败
                      </p>
                    </div>
                  )}
                  {/* 选中角标 */}
                  {isSelected && item.status === "ready" && (
                    <div
                      style={{
                        position: "absolute",
                        top: 4,
                        right: 4,
                        background: "#1677ff",
                        color: "#fff",
                        fontSize: 10,
                        padding: "2px 6px",
                        borderRadius: 4,
                      }}
                    >
                      预览 #{item.index + 1}
                    </div>
                  )}
                </div>
                {/* 底部信息 */}
                {item.status === "ready" && item.result && (
                  <div
                    style={{
                      padding: "6px 8px",
                      background: "#fafafa",
                      fontSize: 11,
                      color: "#666",
                      display: "flex",
                      justifyContent: "space-between",
                    }}
                  >
                    <span>{item.result.duration.toFixed(1)}秒</span>
                    <span>{item.result.clipCount}段</span>
                  </div>
                )}
              </div>
            )
          })}
        </div>
      )}

      {/* 整体进度条（多预览生成中） */}
      {anyGenerating && (
        <div className="xx-preview-progress-bar" style={{ marginBottom: 12 }}>
          <div className="xx-preview-progress-fill" style={{ width: `${overallProgress}%` }} />
        </div>
      )}

      {/* 全部完成提示 */}
      {overallStatus === "ready" && (
        <div className="xx-preview-tip">
          <CheckCircleFilled style={{ color: "#52c41a", marginRight: 8 }} />
          <span>
            {items.filter((it) => it.status === "ready").length} 个预览生成成功
            {items.length > 1 ? "，点击选择要查看的版本" : "，确认效果后进入下一步"}
          </span>
          <button
            className="xx-preview-regenerate-btn"
            onClick={onRegeneratePreview}
            title="重新生成"
          >
            <ReloadOutlined /> 重新生成
          </button>
        </div>
      )}

      {/* 全部失败 */}
      {isError && (
        <div className="xx-preview-error">
          <ExclamationCircleFilled style={{ fontSize: 28, color: "#ef4444" }} />
          <p className="xx-preview-error-text">预览生成失败</p>
          <p className="xx-preview-error-desc">
            {typeof overallError === "string" && overallError ? overallError : "请稍后重试"}
          </p>
          <button className="xx-btn xx-btn-primary" onClick={onRegeneratePreview}>
            <ReloadOutlined /> 重新生成
          </button>
        </div>
      )}
    </div>
  )
}

export default Step4GeneratePreview