//
//  PhotosImageClassifier+Process.swift
//  Demo
//
//  Created by Groot on 2025/4/27.
//

import Foundation
import Vision
import Photos

// MARK: - 图像处理
extension PhotosImageClassifier {
    /// 处理单个图像，提取分类特征
    /// - Parameter item: 图像项目
    func processImage(with types: [PhotoImageClassifyType], item: inout ImageItem) {
        var imageInfo = ImageItem.ClassifyInfo()

        // 检测屏幕截图
        if types.contains(.screenshot) {
            imageInfo.isScreenshot = item.asset.mediaSubtypes.contains(.photoScreenshot)
        }
        // 检测模糊图像
        if types.contains(.blurry) {
            imageInfo.isBlurry = Self.detectBlurryImages(item: item)
        }

        guard types.contains(.similar) || types.contains(.people), let cgImage = item.thumbnailImage?.cgImage else {
            item.classfiyInfo = imageInfo
            return
        }
        
        // Vision 请求处理
        let requestHandler = VNImageRequestHandler(cgImage: cgImage, options: [:])
        // 特征向量提取请求
        let featureDetectionRequest = VNGenerateImageFeaturePrintRequest()
        // 人脸检测请求
        let faceDetectionRequest = VNDetectFaceRectanglesRequest()
        faceDetectionRequest.revision = VNDetectFaceRectanglesRequestRevision3
        
        let requests = [
            types.contains(.similar) ? featureDetectionRequest : nil,
            types.contains(.people) ? faceDetectionRequest : nil
        ].compactMap { $0 }
        
        guard !requests.isEmpty else {
            item.classfiyInfo = imageInfo
            return
        }

        try? requestHandler.perform(requests)
        // 获取相似特征
        if types.contains(.similar), let featureDetectResult = featureDetectionRequest.results?.first as? VNFeaturePrintObservation {
            imageInfo.similarFeature = featureDetectResult
        }
        // 检测人脸
        if types.contains(.people), let faceDetectResult = faceDetectionRequest.results, !faceDetectResult.isEmpty {
            imageInfo.containsPeople = true
        }

        item.classfiyInfo = imageInfo
    }
}