//
//  SessionConfigurationFactory.swift
//  GasTankAR
//
//  Created by Dennis Nemec on 26.08.26.
//

import ARKit

/// Baut die `ARWorldTrackingConfiguration` für den AR-Modus.
/// Kapselt die LiDAR-/People-Occlusion-/Image-Detection-Logik an einem Ort.
struct SessionConfigurationFactory {
    let useLiDAR: Bool
    let referenceImages: Set<ARReferenceImage>

    func make(withImages: Bool, initialWorldMap: ARWorldMap?) -> ARWorldTrackingConfiguration {
        let config = ARWorldTrackingConfiguration()
        config.planeDetection = [.horizontal]

        if useLiDAR {
            if ARWorldTrackingConfiguration.supportsSceneReconstruction(.mesh) {
                config.sceneReconstruction = .mesh
            }
            if ARWorldTrackingConfiguration.supportsFrameSemantics(.sceneDepth) {
                config.frameSemantics.insert(.sceneDepth)
            }
        } else {
            config.sceneReconstruction = []
            config.frameSemantics = []
        }

        // People Occlusion funktioniert auch ohne LiDAR (A12+): Personen zwischen Kamera
        // und Tank verdecken das Objekt korrekt. (Beliebige Objekte wie Stühle brauchen LiDAR.)
        if ARWorldTrackingConfiguration.supportsFrameSemantics(.personSegmentationWithDepth) {
            config.frameSemantics.insert(.personSegmentationWithDepth)
        }

        if let initialWorldMap {
            config.initialWorldMap = initialWorldMap
        }
        if withImages {
            config.detectionImages = referenceImages
            config.maximumNumberOfTrackedImages = 1
        }
        return config
    }
}