Initial commit for first version of project

GasTankAR/PreviewSupport.swift

@@ -0,0 +1,134 @@
+//
+//  PreviewSupport.swift
+//  GasTankAR
+//
+//  Created by Dennis Nemec on 26.08.26.
+//
+
+#if DEBUG
+import Foundation
+import SwiftData
+import UIKit
+
+/// Beispieldaten und In-Memory-Container ausschließlich für SwiftUI-Previews.
+/// Wird über `#if DEBUG` aus Release-Builds ausgeschlossen.
+@MainActor
+enum PreviewSupport {
+    /// Container mit einer Reihe an Beispielprojekten.
+    static let container: ModelContainer = {
+        let container = makeEmptyContainer()
+        for project in sampleProjects() {
+            container.mainContext.insert(project)
+        }
+        return container
+    }()
+
+    /// Leerer In-Memory-Container (z. B. für den „Leer"-Zustand).
+    static func makeEmptyContainer() -> ModelContainer {
+        let configuration = ModelConfiguration(isStoredInMemoryOnly: true)
+        // swiftlint:disable:next force_try
+        return try! ModelContainer(for: Project.self, configurations: configuration)
+    }
+
+    /// Ein einzelnes Beispielprojekt inklusive Container (für Detail-Previews).
+    static func singleProjectContainer() -> (container: ModelContainer, project: Project) {
+        let container = makeEmptyContainer()
+        let project = Project(
+            leadID: "LEAD-1001",
+            customerName: "Müller Heizungsbau",
+            creationDate: .now,
+            tank: Tank()
+        )
+        container.mainContext.insert(project)
+        return (container, project)
+    }
+
+    /// Projekt inklusive Beispiel-Fotos (mit generierten Test-Bildern) für die Galerie-Preview.
+    /// Deckt mehrere Aufnahmetage sowie Fotos mit und ohne Standort ab.
+    static func galleryProjectContainer() -> (container: ModelContainer, project: Project) {
+        let container = makeEmptyContainer()
+        let project = Project(
+            leadID: "LEAD-1042",
+            customerName: "Müller Heizungsbau",
+            creationDate: .now
+        )
+        container.mainContext.insert(project)
+
+        let day: TimeInterval = 86_400
+        let samples: [(color: UIColor, label: String, offset: TimeInterval, lat: Double?, lon: Double?)] = [
+            (.systemBlue, "1", 0, 52.5200, 13.4050),
+            (.systemGreen, "2", -3_600, 48.1372, 11.5756),
+            (.systemOrange, "3", -day, nil, nil),
+            (.systemPurple, "4", -3 * day, 50.1109, 8.6821),
+        ]
+        for sample in samples {
+            let photo = ProjectPhoto(
+                creationDate: Date.now.addingTimeInterval(sample.offset),
+                imageData: sampleImageData(color: sample.color, label: sample.label),
+                latitude: sample.lat,
+                longitude: sample.lon,
+                project: project
+            )
+            container.mainContext.insert(photo)
+        }
+        return (container, project)
+    }
+
+    /// Einzelnes Beispiel-Foto (mit Standort) für die Detail-Preview.
+    static func samplePhoto() -> ProjectPhoto {
+        ProjectPhoto(
+            creationDate: .now,
+            imageData: sampleImageData(color: .systemTeal, label: "AR"),
+            latitude: 52.5200,
+            longitude: 13.4050
+        )
+    }
+
+    /// Erzeugt ein einfarbiges Test-Bild mit zentrierter Beschriftung als JPEG-Daten.
+    static func sampleImageData(color: UIColor, label: String) -> Data {
+        let size = CGSize(width: 1200, height: 900)
+        let image = UIGraphicsImageRenderer(size: size).image { context in
+            color.setFill()
+            context.fill(CGRect(origin: .zero, size: size))
+
+            let text = label as NSString
+            let attributes: [NSAttributedString.Key: Any] = [
+                .font: UIFont.boldSystemFont(ofSize: 240),
+                .foregroundColor: UIColor.white,
+            ]
+            let textSize = text.size(withAttributes: attributes)
+            let origin = CGPoint(
+                x: (size.width - textSize.width) / 2,
+                y: (size.height - textSize.height) / 2
+            )
+            text.draw(at: origin, withAttributes: attributes)
+        }
+        return image.jpegData(compressionQuality: 0.8) ?? Data()
+    }
+
+    /// Erzeugt eine Reihe von Beispielprojekten.
+    static func sampleProjects(count: Int = 40) -> [Project] {
+        let names: [String] = [
+            "Müller Heizungsbau", "Schmidt GmbH", "Weber & Söhne", "Fischer Sanitär",
+            "Becker Klimatechnik", "Hoffmann Anlagenbau", "Wagner & Partner", "Schulz Energie",
+            "Koch Gasversorgung", "Richter Industrie", "Klein Tankbau", "Wolf Technik",
+            "Neumann GmbH", "Schwarz Heizsysteme", "Zimmermann AG", "Braun Installationen",
+        ]
+
+        var projects: [Project] = []
+        for index in 0..<count {
+            let leadNumber: Int = 1001 + index
+            let leadID: String = "LEAD-" + String(leadNumber)
+            let offset: TimeInterval = TimeInterval(-index) * 86_400
+            let project = Project(
+                leadID: leadID,
+                customerName: names[index % names.count],
+                creationDate: Date.now.addingTimeInterval(offset),
+                tank: Tank()
+            )
+            projects.append(project)
+        }
+        return projects
+    }
+}
+#endif