SophaxChat/Views/Settings/DuressPINSetupView.swift

1// DuressPINSetupView.swift
2// SophaxChat
3//
4// UI for setting the real lock PIN and the duress PIN.
5// Two separate structs presented from SettingsView.
6
7import SwiftUI
8
9// MARK: - Real lock PIN setup
10
11struct LockPINSetupView: View {
12    @EnvironmentObject var appState: AppState
13    @Environment(\.dismiss) private var dismiss
14
15    @State private var pin        = ""
16    @State private var confirm    = ""
17    @State private var errorText: String?
18    @State private var saved      = false
19
20    var body: some View {
21        NavigationStack {
22            Form {
23                Section {
24                    Text("Set a numeric PIN as an alternative unlock method alongside biometrics.")
25                        .font(.subheadline)
26                        .foregroundStyle(.secondary)
27                }
28
29                Section("New PIN") {
30                    SecureField("PIN (4–8 digits)", text: $pin)
31                        .keyboardType(.numberPad)
32                        .textContentType(.newPassword)
33                    SecureField("Confirm PIN", text: $confirm)
34                        .keyboardType(.numberPad)
35                        .textContentType(.newPassword)
36                }
37
38                Section {
39                    Button("Save PIN") {
40                        savePIN()
41                    }
42                    .disabled(!isValid)
43                }
44
45                if let err = errorText {
46                    Section { Text(err).foregroundStyle(.red) }
47                }
48                if saved {
49                    Section { Text("Lock PIN saved.").foregroundStyle(.green) }
50                }
51            }
52            .navigationTitle("Set Lock PIN")
53            .navigationBarTitleDisplayMode(.inline)
54            .toolbar {
55                ToolbarItem(placement: .confirmationAction) {
56                    Button("Done") { dismiss() }
57                }
58            }
59        }
60    }
61
62    private var isValid: Bool {
63        let digits = pin.filter(\.isNumber)
64        return digits.count >= 4 && digits.count <= 8 && pin == confirm
65    }
66
67    private func savePIN() {
68        errorText = nil
69        saved     = false
70        do {
71            try appState.setRealLockPIN(pin)
72            saved   = true
73            pin     = ""
74            confirm = ""
75        } catch {
76            errorText = error.localizedDescription
77        }
78    }
79}
80
81// MARK: - Duress PIN setup
82
83struct DuressPINSetupView: View {
84    @EnvironmentObject var appState: AppState
85    @Environment(\.dismiss) private var dismiss
86
87    @State private var pin        = ""
88    @State private var confirm    = ""
89    @State private var errorText: String?
90    @State private var saved      = false
91
92    var body: some View {
93        NavigationStack {
94            Form {
95                Section {
96                    Text("When you enter this PIN on the lock screen, the app appears empty — no messages, no contacts. The real app remains intact.")
97                        .font(.subheadline)
98                        .foregroundStyle(.secondary)
99                }
100
101                Section("Duress PIN") {
102                    SecureField("PIN (4–8 digits, different from lock PIN)", text: $pin)
103                        .keyboardType(.numberPad)
104                        .textContentType(.newPassword)
105                    SecureField("Confirm PIN", text: $confirm)
106                        .keyboardType(.numberPad)
107                        .textContentType(.newPassword)
108                }
109
110                Section {
111                    Button("Save Duress PIN") {
112                        savePIN()
113                    }
114                    .disabled(!isValid)
115                }
116
117                if let err = errorText {
118                    Section { Text(err).foregroundStyle(.red) }
119                }
120                if saved {
121                    Section { Text("Duress PIN saved.").foregroundStyle(.green) }
122                }
123
124                Section {
125                    VStack(alignment: .leading, spacing: 6) {
126                        Label("Entering this PIN will NOT unlock the real app", systemImage: "eye.slash")
127                        Label("The app shows an empty state with no data", systemImage: "tray")
128                        Label("Messages are silently dropped until real unlock", systemImage: "bell.slash")
129                        Label("Must differ from your real lock PIN", systemImage: "exclamationmark.triangle")
130                    }
131                    .font(.caption)
132                    .foregroundStyle(.secondary)
133                }
134            }
135            .navigationTitle("Set Duress PIN")
136            .navigationBarTitleDisplayMode(.inline)
137            .toolbar {
138                ToolbarItem(placement: .confirmationAction) {
139                    Button("Done") { dismiss() }
140                }
141            }
142        }
143    }
144
145    private var isValid: Bool {
146        let digits = pin.filter(\.isNumber)
147        guard digits.count >= 4 && digits.count <= 8 && pin == confirm else { return false }
148        // Must not match the real lock PIN
149        return !appState.verifyRealLockPIN(pin)
150    }
151
152    private func savePIN() {
153        errorText = nil
154        saved     = false
155        do {
156            try appState.setDuressPIN(pin)
157            saved   = true
158            pin     = ""
159            confirm = ""
160        } catch {
161            errorText = error.localizedDescription
162        }
163    }
164}