Add lead workflows, PDF signing, AR projects and photo gallery integration

GasTankAR/Data/Leads/StubLeadDetailRemoteService.swift

@@ -0,0 +1,111 @@
+import Foundation
+import UIKit
+
+@MainActor
+final class StubLeadDetailRemoteService: LeadDetailRemoteService {
+    enum Scenario { case success, offline, timeout, http(Int), invalidFile }
+    var detailScenario: Scenario = .success
+    var fileScenario: Scenario = .success
+    var delay: Duration
+    private(set) var downloadCount = 0
+    private let leads: any LeadRemoteService
+
+    init(leads: (any LeadRemoteService)? = nil,
+         delay: Duration = .milliseconds(400)) {
+        self.leads = leads ?? StubLeadRemoteService(delay: .zero)
+        self.delay = delay
+    }
+
+    func fetchDetail(id: String, salesCode: String) async throws -> LeadDetailDTO {
+        try await simulate(detailScenario)
+        let lead = try await leads.fetchLead(id: id, salesCode: salesCode).toDomain()
+        return LeadDetailDTO(detail: LeadDetailSampleData.make(for: lead))
+    }
+
+    func download(_ reference: LeadFileReference, leadID: String, salesCode: String) async throws -> Data {
+        downloadCount += 1
+        try await simulate(fileScenario)
+        if case .invalidFile = fileScenario { return Data("not a valid file".utf8) }
+        let lead = try await leads.fetchLead(id: leadID, salesCode: salesCode).toDomain()
+        let detail = LeadDetailSampleData.make(for: lead)
+        switch reference.kind {
+        case .pdf:
+            guard let document = detail.offers.flatMap(\.documents).first(where: { $0.file == reference }) else {
+                throw LeadRemoteError.http(statusCode: 404)
+            }
+            return makePDF(document: document, customer: lead.displayName)
+        case .image:
+            guard let photo = detail.photos.first(where: { $0.thumbnail == reference || $0.original == reference }) else {
+                throw LeadRemoteError.http(statusCode: 404)
+            }
+            return makeImage(photo: photo, thumbnail: reference == photo.thumbnail)
+        }
+    }
+
+    private func simulate(_ scenario: Scenario) async throws {
+        try await Task.sleep(for: delay)
+        try Task.checkCancellation()
+        switch scenario {
+        case .success, .invalidFile: break
+        case .offline: throw URLError(.notConnectedToInternet)
+        case .timeout: throw URLError(.timedOut)
+        case .http(let code): throw LeadRemoteError.http(statusCode: code)
+        }
+    }
+
+    private func makePDF(document: LeadDocument, customer: String) -> Data {
+        let renderer = UIGraphicsPDFRenderer(bounds: CGRect(x: 0, y: 0, width: 595, height: 842))
+        return renderer.pdfData { context in
+            for page in 1...document.pageCount {
+                context.beginPage()
+                let title = document.title.replacingOccurrences(of: ".pdf", with: "")
+                (title as NSString).draw(in: CGRect(x: 48, y: 56, width: 499, height: 100),
+                                        withAttributes: [.font: UIFont.boldSystemFont(ofSize: 24)])
+                let body = """
+                DrachenGas – Beispieldokument
+                \(customer)
+
+                Seite \(page) von \(document.pageCount)
+
+                Diese Datei dient ausschließlich zur Vorschau der Download- und PDF-Anzeige.
+                Sie enthält keine verbindlichen Vertragsbedingungen.
+
+                Bitte prüfen Sie alle Seiten vor der Unterschrift.
+                """
+                (body as NSString).draw(in: CGRect(x: 48, y: 180, width: 499, height: 540),
+                                       withAttributes: [.font: UIFont.systemFont(ofSize: 15),
+                                                        .foregroundColor: UIColor.darkGray])
+                if let placement = document.signaturePlacement, placement.pageIndex == page - 1 {
+                    let bounds = placement.bounds
+                    let field = CGRect(x: bounds.minX, y: 842 - bounds.maxY,
+                                       width: bounds.width, height: bounds.height)
+                    UIColor.lightGray.setStroke()
+                    UIBezierPath(rect: field).stroke()
+                    ("Unterschrift Kunde" as NSString).draw(
+                        at: CGPoint(x: field.minX, y: field.maxY + 8),
+                        withAttributes: [.font: UIFont.systemFont(ofSize: 11),
+                                         .foregroundColor: UIColor.darkGray]
+                    )
+                }
+            }
+        }
+    }
+
+    private func makeImage(photo: LeadPhoto, thumbnail: Bool) -> Data {
+        let size = thumbnail ? CGSize(width: 360, height: 220) : CGSize(width: 1200, height: 800)
+        let renderer = UIGraphicsImageRenderer(size: size)
+        return renderer.pngData { context in
+            UIColor.systemTeal.withAlphaComponent(0.14).setFill()
+            context.fill(CGRect(origin: .zero, size: size))
+            let symbol = UIImage(systemName: photo.isAR ? "arkit" : "photo")?
+                .withTintColor(.systemBlue, renderingMode: .alwaysOriginal)
+            symbol?.draw(in: CGRect(x: size.width * 0.4, y: size.height * 0.2,
+                                   width: size.width * 0.2, height: size.height * 0.35))
+            ("Beispiel · \(photo.title)" as NSString).draw(
+                in: CGRect(x: 20, y: size.height * 0.72, width: size.width - 40, height: 60),
+                withAttributes: [.font: UIFont.systemFont(ofSize: thumbnail ? 16 : 32),
+                                 .foregroundColor: UIColor.darkGray]
+            )
+        }
+    }
+}