feat: add SmartPlaylistBuilderSheet with ConditionRowView

Also fixes two pre-existing call sites in PlaylistViewModel that still
used the old observeSmartPlaylistTracks(searchQuery:) label after it
was renamed to observeSmartPlaylistTracks(for:) in a prior task.

Music/ViewModels/PlaylistViewModel.swift

@@ -102,6 +102,10 @@ final class PlaylistViewModel {
         _ = try db.createSmartPlaylist(name: name, searchQuery: searchQuery)
     }
 
+    func createSmartPlaylist(name: String, conditions: [SmartPlaylistCondition]) throws {
+        _ = try db.createSmartPlaylist(name: name, conditions: conditions)
+    }
+
     func renameSmartPlaylist(_ smartPlaylist: SmartPlaylist, to name: String) throws {
         guard let id = smartPlaylist.id else { return }
         try db.renameSmartPlaylist(id: id, name: name)
@@ -111,7 +115,20 @@ final class PlaylistViewModel {
         guard let id = smartPlaylist.id else { return }
         try db.updateSmartPlaylistQuery(id: id, searchQuery: query)
         if selectedSmartPlaylist?.id == id {
-            observeSmartPlaylistTracks(searchQuery: query)
+            var updated = smartPlaylist
+            updated.searchQuery = query
+            updated.conditions = nil
+            observeSmartPlaylistTracks(for: updated)
+        }
+    }
+
+    func updateSmartPlaylistConditions(_ smartPlaylist: SmartPlaylist, to conditions: [SmartPlaylistCondition]) throws {
+        guard let id = smartPlaylist.id else { return }
+        try db.updateSmartPlaylistConditions(id: id, conditions: conditions)
+        if selectedSmartPlaylist?.id == id {
+            var updated = smartPlaylist
+            updated.conditions = conditions
+            observeSmartPlaylistTracks(for: updated)
         }
     }
 
@@ -130,7 +147,7 @@ final class PlaylistViewModel {
         if item is Playlist {
             observePlaylistTracks()
         } else if let smart = item as? SmartPlaylist {
-            observeSmartPlaylistTracks(searchQuery: smart.searchQuery)
+            observeSmartPlaylistTracks(for: smart)
         }
     }
 
@@ -150,7 +167,7 @@ final class PlaylistViewModel {
             sortAscending = true
         }
         if let smart = selectedSmartPlaylist {
-            observeSmartPlaylistTracks(searchQuery: smart.searchQuery)
+            observeSmartPlaylistTracks(for: smart)
         }
     }
 
@@ -215,13 +232,21 @@ final class PlaylistViewModel {
         )
     }
 
-    private func observeSmartPlaylistTracks(searchQuery: String) {
+    private func observeSmartPlaylistTracks(for smartPlaylist: SmartPlaylist) {
         tracksCancellable?.cancel()
         let col = sortColumn
         let asc = sortAscending
 
-        let observation = ValueObservation.tracking { [db] dbAccess in
-            try db.fetchTracks(db: dbAccess, search: searchQuery, sortColumn: col, ascending: asc)
+        let observation: ValueObservation<ValueReducers.Fetch<[Track]>>
+        if let conditions = smartPlaylist.conditions {
+            observation = ValueObservation.tracking { [db] dbAccess in
+                try db.fetchTracks(db: dbAccess, conditions: conditions, sortColumn: col, ascending: asc)
+            }
+        } else {
+            let searchQuery = smartPlaylist.searchQuery
+            observation = ValueObservation.tracking { [db] dbAccess in
+                try db.fetchTracks(db: dbAccess, search: searchQuery, sortColumn: col, ascending: asc)
+            }
         }
         tracksCancellable = observation.start(
             in: db.dbPool,

Music/Views/SmartPlaylistBuilderSheet.swift

@@ -0,0 +1,149 @@
+import SwiftUI
+
+struct SmartPlaylistBuilderSheet: View {
+    var editingPlaylist: SmartPlaylist?
+    var onSave: (String, [SmartPlaylistCondition]) -> Void
+    var onCancel: () -> Void
+
+    @State private var name: String
+    @State private var conditions: [SmartPlaylistCondition]
+
+    init(
+        editingPlaylist: SmartPlaylist? = nil,
+        onSave: @escaping (String, [SmartPlaylistCondition]) -> Void,
+        onCancel: @escaping () -> Void
+    ) {
+        self.editingPlaylist = editingPlaylist
+        self.onSave = onSave
+        self.onCancel = onCancel
+        let defaultCondition = SmartPlaylistCondition(field: .artist, op: .equals, value: .string(""))
+        _name = State(initialValue: editingPlaylist?.name ?? "")
+        _conditions = State(initialValue: editingPlaylist?.conditions ?? [defaultCondition])
+    }
+
+    private var canSave: Bool {
+        !name.trimmingCharacters(in: .whitespaces).isEmpty &&
+        conditions.allSatisfy { !$0.isEmpty }
+    }
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 16) {
+            Text(editingPlaylist == nil ? "New Smart Playlist" : "Edit Smart Playlist")
+                .font(.headline)
+
+            VStack(alignment: .leading, spacing: 4) {
+                Text("Name")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+                TextField("Playlist name", text: $name)
+                    .textFieldStyle(.roundedBorder)
+            }
+
+            VStack(alignment: .leading, spacing: 6) {
+                Text("Conditions (all must match)")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+
+                ForEach(conditions.indices, id: \.self) { index in
+                    ConditionRowView(
+                        condition: $conditions[index],
+                        canRemove: conditions.count > 1,
+                        onRemove: { conditions.remove(at: index) }
+                    )
+                }
+
+                Button("+ Add Condition") {
+                    conditions.append(SmartPlaylistCondition(field: .artist, op: .equals, value: .string("")))
+                }
+                .buttonStyle(.plain)
+                .foregroundStyle(Color.accentColor)
+                .font(.system(size: 12))
+            }
+
+            Divider()
+
+            HStack {
+                Spacer()
+                Button("Cancel", action: onCancel)
+                Button("Save") {
+                    onSave(name.trimmingCharacters(in: .whitespaces), conditions)
+                }
+                .disabled(!canSave)
+                .keyboardShortcut(.defaultAction)
+            }
+        }
+        .padding(20)
+        .frame(width: 540)
+    }
+}
+
+private struct ConditionRowView: View {
+    @Binding var condition: SmartPlaylistCondition
+    var canRemove: Bool
+    var onRemove: () -> Void
+
+    var body: some View {
+        HStack(spacing: 8) {
+            Picker("", selection: $condition.field) {
+                ForEach(TrackField.allCases) { field in
+                    Text(field.displayName).tag(field)
+                }
+            }
+            .labelsHidden()
+            .frame(maxWidth: 130)
+            .onChange(of: condition.field) { _, newField in
+                condition.op = newField.validOperators[0]
+                condition.value = newField.defaultValue
+            }
+
+            Picker("", selection: $condition.op) {
+                ForEach(condition.field.validOperators) { op in
+                    Text(op.displayName).tag(op)
+                }
+            }
+            .labelsHidden()
+            .frame(maxWidth: 130)
+
+            valueField
+
+            Button(action: onRemove) {
+                Image(systemName: "minus.circle.fill")
+                    .foregroundStyle(Color.secondary.opacity(canRemove ? 1.0 : 0.3))
+            }
+            .buttonStyle(.plain)
+            .disabled(!canRemove)
+        }
+    }
+
+    @ViewBuilder
+    private var valueField: some View {
+        switch condition.field.fieldType {
+        case .string:
+            TextField("Value", text: Binding(
+                get: { if case .string(let s) = condition.value { return s } else { return "" } },
+                set: { condition.value = .string($0) }
+            ))
+            .textFieldStyle(.roundedBorder)
+        case .int:
+            TextField("Value", text: Binding(
+                get: { if case .int(let i) = condition.value { return String(i) } else { return "0" } },
+                set: { condition.value = .int(Int($0) ?? 0) }
+            ))
+            .textFieldStyle(.roundedBorder)
+            .frame(maxWidth: 100)
+        case .double:
+            TextField("Value", text: Binding(
+                get: { if case .double(let d) = condition.value { return String(d) } else { return "0" } },
+                set: { condition.value = .double(Double($0) ?? 0) }
+            ))
+            .textFieldStyle(.roundedBorder)
+            .frame(maxWidth: 100)
+        case .date:
+            DatePicker("", selection: Binding(
+                get: { if case .date(let d) = condition.value { return d } else { return Date() } },
+                set: { condition.value = .date($0) }
+            ), displayedComponents: .date)
+            .labelsHidden()
+        }
+    }
+}