Extract main toolbar action planning

src/app_core/main_toolbar.h

@@ -0,0 +1,146 @@
+#pragma once
+
+#include "app_core/document_canvas.h"
+#include "app_core/history_ui.h"
+#include "foundation/result.h"
+
+#include <string>
+
+namespace pp::app {
+
+enum class MainToolbarCommand {
+    open_document,
+    save_document,
+    undo,
+    redo,
+    clear_history,
+    clear_canvas,
+    show_message_box,
+    show_settings,
+};
+
+enum class MainToolbarAction {
+    show_open_dialog,
+    show_save_dialog,
+    invoke_undo,
+    invoke_redo,
+    clear_history,
+    clear_canvas,
+    show_message_box,
+    show_settings_dialog,
+    no_op_unavailable,
+};
+
+struct MainToolbarPlan {
+    MainToolbarCommand command = MainToolbarCommand::open_document;
+    MainToolbarAction action = MainToolbarAction::show_open_dialog;
+    std::string label;
+    bool requires_canvas = false;
+    bool updates_memory_label = false;
+    bool updates_title = false;
+    bool records_undo = false;
+    bool marks_unsaved = false;
+    bool no_op = false;
+};
+
+[[nodiscard]] inline pp::foundation::Result<MainToolbarPlan> plan_main_toolbar_command(
+    MainToolbarCommand command,
+    int undo_count = 0,
+    int redo_count = 0,
+    int memory_bytes = 0,
+    bool has_canvas = true)
+{
+    MainToolbarPlan plan;
+    plan.command = command;
+
+    switch (command) {
+    case MainToolbarCommand::open_document:
+        plan.action = MainToolbarAction::show_open_dialog;
+        plan.label = "Open";
+        return pp::foundation::Result<MainToolbarPlan>::success(plan);
+
+    case MainToolbarCommand::save_document:
+        plan.action = MainToolbarAction::show_save_dialog;
+        plan.label = "Save";
+        return pp::foundation::Result<MainToolbarPlan>::success(plan);
+
+    case MainToolbarCommand::undo:
+    {
+        const auto history = plan_history_undo(undo_count);
+        if (!history) {
+            return pp::foundation::Result<MainToolbarPlan>::failure(history.status());
+        }
+        plan.action = history.value().invokes_undo
+            ? MainToolbarAction::invoke_undo
+            : MainToolbarAction::no_op_unavailable;
+        plan.label = history.value().invokes_undo ? "Undo" : "Undo (No history)";
+        plan.updates_memory_label = history.value().updates_memory_label;
+        plan.updates_title = history.value().updates_title;
+        plan.no_op = history.value().no_op;
+        return pp::foundation::Result<MainToolbarPlan>::success(plan);
+    }
+
+    case MainToolbarCommand::redo:
+    {
+        const auto history = plan_history_redo(redo_count);
+        if (!history) {
+            return pp::foundation::Result<MainToolbarPlan>::failure(history.status());
+        }
+        plan.action = history.value().invokes_redo
+            ? MainToolbarAction::invoke_redo
+            : MainToolbarAction::no_op_unavailable;
+        plan.label = history.value().invokes_redo ? "Redo" : "Redo (No history)";
+        plan.updates_memory_label = history.value().updates_memory_label;
+        plan.updates_title = history.value().updates_title;
+        plan.no_op = history.value().no_op;
+        return pp::foundation::Result<MainToolbarPlan>::success(plan);
+    }
+
+    case MainToolbarCommand::clear_history:
+    {
+        const auto history = plan_history_clear(undo_count, redo_count, memory_bytes);
+        if (!history) {
+            return pp::foundation::Result<MainToolbarPlan>::failure(history.status());
+        }
+        plan.action = history.value().clears_history
+            ? MainToolbarAction::clear_history
+            : MainToolbarAction::no_op_unavailable;
+        plan.label = history.value().clears_history ? "Clear History" : "Clear History (Empty)";
+        plan.updates_memory_label = history.value().updates_memory_label;
+        plan.no_op = history.value().no_op;
+        return pp::foundation::Result<MainToolbarPlan>::success(plan);
+    }
+
+    case MainToolbarCommand::clear_canvas:
+    {
+        const auto clear = plan_document_canvas_clear(has_canvas);
+        if (!clear) {
+            return pp::foundation::Result<MainToolbarPlan>::failure(clear.status());
+        }
+        plan.action = clear.value().clears_canvas
+            ? MainToolbarAction::clear_canvas
+            : MainToolbarAction::no_op_unavailable;
+        plan.label = clear.value().clears_canvas ? "Clear Canvas" : "Clear Canvas (No canvas)";
+        plan.requires_canvas = true;
+        plan.records_undo = clear.value().records_undo;
+        plan.marks_unsaved = clear.value().marks_unsaved;
+        plan.no_op = clear.value().no_op;
+        return pp::foundation::Result<MainToolbarPlan>::success(plan);
+    }
+
+    case MainToolbarCommand::show_message_box:
+        plan.action = MainToolbarAction::show_message_box;
+        plan.label = "Show Message Box";
+        return pp::foundation::Result<MainToolbarPlan>::success(plan);
+
+    case MainToolbarCommand::show_settings:
+        plan.action = MainToolbarAction::show_settings_dialog;
+        plan.label = "Settings";
+        return pp::foundation::Result<MainToolbarPlan>::success(plan);
+    }
+
+    return pp::foundation::Result<MainToolbarPlan>::failure(
+        pp::foundation::Status::invalid_argument("unknown main toolbar command"));
+}
+
+} // namespace pp::app