From 0d764502f7dab65164b529aa0b14030c45ac3042 Mon Sep 17 00:00:00 2001
From: Qijia Liu <liumeo@pku.edu.cn>
Date: Fri, 13 Dec 2024 22:36:52 -0500
Subject: [PATCH] ListView; fallback Key to String (#33)

---
 src/config/BooleanView.swift |  2 +-
 src/config/EnumView.swift    |  2 +-
 src/config/ListView.swift    | 81 ++++++++++++++++++++++++++++++++++++
 src/config/StringView.swift  |  6 ++-
 src/config/option.swift      |  5 ++-
 5 files changed, 91 insertions(+), 5 deletions(-)
 create mode 100644 src/config/ListView.swift

diff --git a/src/config/BooleanView.swift b/src/config/BooleanView.swift
index 89ccc42..ed90b0a 100644
--- a/src/config/BooleanView.swift
+++ b/src/config/BooleanView.swift
@@ -9,7 +9,7 @@ struct BooleanView: OptionViewProtocol {
     Toggle(
       isOn: Binding<Bool>(
         get: { value as! String == "True" },
-        set: { x in value = x ? "True" : "False" }
+        set: { value = $0 ? "True" : "False" }
       )
     ) {
       Text(label)
diff --git a/src/config/EnumView.swift b/src/config/EnumView.swift
index 1d66399..e8eaeaf 100644
--- a/src/config/EnumView.swift
+++ b/src/config/EnumView.swift
@@ -18,7 +18,7 @@ struct EnumView: OptionViewProtocol {
       label,
       selection: Binding<String>(
         get: { value as! String },
-        set: { x in value = x }
+        set: { value = $0 }
       )
     ) {
       ForEach(dataToOptions(data), id: \.0) { pair in
diff --git a/src/config/ListView.swift b/src/config/ListView.swift
new file mode 100644
index 0000000..287946f
--- /dev/null
+++ b/src/config/ListView.swift
@@ -0,0 +1,81 @@
+import SwiftUI
+
+private func deserialize(_ value: Any) -> [Any] {
+  guard let value = value as? [String: Any] else {
+    return []
+  }
+  return (0..<value.count).compactMap { i in value[String(i)] }
+}
+
+private func serialize(_ value: [Any]) -> [String: Any] {
+  return value.enumerated().reduce(into: [String: Any]()) { result, pair in
+    result[String(pair.offset)] = pair.element
+  }
+}
+
+private struct ListSectionHeader: View {
+  @Binding var value: Any
+
+  var body: some View {
+    HStack {
+      Spacer()
+      Button {
+        var list = deserialize(value)
+        list.append("")
+        value = serialize(list)
+      } label: {
+        Image(systemName: "plus")
+      }
+    }
+  }
+}
+
+struct ListSubView: OptionViewProtocol {
+  let label: String
+  let data: [String: Any]
+  @Binding var value: Any
+
+  var body: some View {
+    let type = data["Type"] as! String
+    let optionViewType = toOptionViewType(["Type": String(type.suffix(type.count - "List|".count))])
+    var list = deserialize(value)
+    List {
+      Section(header: ListSectionHeader(value: $value)) {
+        ForEach(list.indices, id: \.self) { i in
+          AnyView(
+            optionViewType.init(
+              label: "", data: [:],
+              value: Binding<Any>(
+                get: { list[i] },
+                set: {
+                  list[i] = $0
+                  value = serialize(list)
+                }
+              )))
+        }
+        .onDelete { offsets in
+          list.remove(atOffsets: offsets)
+          value = serialize(list)
+        }
+        .onMove { indices, newOffset in
+          list.move(fromOffsets: indices, toOffset: newOffset)
+          value = serialize(list)
+        }
+      }
+    }.navigationTitle(label)
+  }
+}
+
+struct ListView: OptionViewProtocol {
+  let label: String
+  let data: [String: Any]
+  @Binding var value: Any
+
+  var body: some View {
+    NavigationLink(
+      destination: ListSubView(label: label, data: data, value: $value)
+    ) {
+      Text(label)
+    }
+  }
+}
diff --git a/src/config/StringView.swift b/src/config/StringView.swift
index ad572e5..2e9aac1 100644
--- a/src/config/StringView.swift
+++ b/src/config/StringView.swift
@@ -14,9 +14,11 @@ struct StringView: View, OptionViewProtocol {
         "",
         text: Binding<String>(
           get: { value as! String },
-          set: { x in value = x }
+          set: { value = $0 }
         )
-      ).multilineTextAlignment(.trailing)
+      )
+      // Leading for List item, trailing for String option.
+      .multilineTextAlignment(label.isEmpty ? .leading : .trailing)
     }
   }
 }
diff --git a/src/config/option.swift b/src/config/option.swift
index 689cad5..4d238e5 100644
--- a/src/config/option.swift
+++ b/src/config/option.swift
@@ -73,7 +73,7 @@ func toOptionViewType(_ data: [String: Any]) -> any OptionViewProtocol.Type {
     return EnumView.self
   case "Integer":
     return IntegerView.self
-  case "String":
+  case "String", "Key":
     if data["IsEnum"] as? String == "True" {
       return EnumView.self
     }
@@ -81,6 +81,9 @@ func toOptionViewType(_ data: [String: Any]) -> any OptionViewProtocol.Type {
   case "External":
     return ExternalView.self
   default:
+    if type.starts(with: "List|") {
+      return ListView.self
+    }
     return UnknownView.self
   }
 }