Lightning Zaps

Added initial lightning zaps/tipping integration

Changelog-Added: Receive Lightning Zaps

damus/Components/ZapButton.swift

@@ -0,0 +1,130 @@
+//
+//  ZapButton.swift
+//  damus
+//
+//  Created by William Casarin on 2023-01-17.
+//
+
+import SwiftUI
+
+struct ZapButton: View {
+    let damus_state: DamusState
+    let event: NostrEvent
+    let lnurl: String
+    
+    @ObservedObject var bar: ActionBarModel
+    
+    @State var zapping: Bool = false
+    @State var invoice: String = ""
+    @State var slider_value: Double = 0.0
+    @State var slider_visible: Bool = false
+    @State var showing_select_wallet: Bool = false
+    
+    func send_zap() {
+        guard let privkey = damus_state.keypair.privkey else {
+            return
+        }
+        
+        // Only take the first 10 because reasons
+        let relays = Array(damus_state.pool.descriptors.prefix(10))
+        let target = ZapTarget.note(id: event.id, author: event.pubkey)
+        // TODO: gather comment?
+        let content = ""
+        let zapreq = make_zap_request_event(pubkey: damus_state.pubkey, privkey: privkey, content: content, relays: relays, target: target)
+        
+        zapping = true
+        
+        Task {
+            var mpayreq = damus_state.lnurls.lookup(target.pubkey)
+            if mpayreq == nil {
+                mpayreq = await fetch_static_payreq(lnurl)
+            }
+            
+            guard let payreq = mpayreq else {
+                // TODO: show error
+                DispatchQueue.main.async {
+                    zapping = false
+                }
+                return
+            }
+            
+            DispatchQueue.main.async {
+                damus_state.lnurls.endpoints[target.pubkey] = payreq
+            }
+            
+            guard let inv = await fetch_zap_invoice(payreq, zapreq: zapreq, amount: 1000000) else {
+                DispatchQueue.main.async {
+                    zapping = false
+                }
+                return
+            }
+            
+            DispatchQueue.main.async {
+                zapping = false
+                
+                if should_show_wallet_selector(damus_state.pubkey) {
+                    self.invoice = inv
+                    self.showing_select_wallet = true
+                } else {
+                    open_with_wallet(wallet: get_default_wallet(damus_state.pubkey).model, invoice: inv)
+                }
+            }
+        }
+        
+        //damus_state.pool.send(.event(zapreq))
+    }
+    
+    var zap_img: String {
+        if bar.zapped {
+            return "bolt.fill"
+        }
+        
+        if !zapping {
+            return "bolt"
+        }
+        
+        return "bolt.horizontal.fill"
+    }
+    
+    var zap_color: Color? {
+        if bar.zapped {
+            return Color.orange
+        }
+        
+        if !zapping {
+            return nil
+        }
+        
+        return Color.yellow
+    }
+    
+    var body: some View {
+        ZStack {
+            EventActionButton(img: zap_img, col: zap_color) {
+                if bar.zapped {
+                    //notify(.delete, bar.our_tip)
+                } else if !zapping {
+                    send_zap()
+                }
+            }
+            
+            Text("\(bar.zap_total > 0 ? "\(format_msats_abbrev(bar.zap_total))" : "")")
+                .font(.footnote)
+                .foregroundColor(bar.zapped ? Color.orange : Color.gray)
+        }
+        .sheet(isPresented: $showing_select_wallet, onDismiss: {showing_select_wallet = false}) {
+            SelectWalletView(showingSelectWallet: $showing_select_wallet, our_pubkey: damus_state.pubkey, invoice: invoice)
+        }
+    }
+}
+
+
+/*
+struct ZapButton_Previews: PreviewProvider {
+    static var previews: some View {
+        let bar = ActionBarModel.empty()
+        ZapButton(damus_state: test_damus_state(), event: NostrEvent(content: "hi", pubkey: "pk"), bar: bar)
+    }
+}
+
+*/