From f3911ead38805b28f59d79f27a43c8955adebc73 Mon Sep 17 00:00:00 2001
From: Fabien Freling <public@ffreling.com>
Date: Mon, 30 Oct 2023 13:48:02 +0100
Subject: [PATCH] add main state

---
 src/main.zig | 48 ++++++++++++++++++++++++++++++++++--------------
 1 file changed, 34 insertions(+), 14 deletions(-)

diff --git a/src/main.zig b/src/main.zig
index 6963fb9..381f173 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -4,6 +4,16 @@ const c = @cImport({
     @cInclude("sqlite3.h");
 });
 
+const StateTag = enum {
+    unloaded,
+    loaded,
+};
+
+const State = union(StateTag) {
+    unloaded: void,
+    loaded: *c.sqlite3,
+};
+
 pub fn main() !void {
     const alloc = std.heap.page_allocator;
 
@@ -12,12 +22,12 @@ pub fn main() !void {
     raylib.InitWindow(screen_width, screen_height, "FabApp");
     raylib.SetTargetFPS(60);
 
+    var state = State{ .unloaded = {} };
+
     var file_dialog_state = raylib.InitGuiWindowFileDialog(raylib.GetWorkingDirectory());
     // const ext = ".sqlite3";
     // @memcpy(file_dialog_state.filterExt[0..ext.len], ext);
 
-    var db: ?*c.sqlite3 = undefined;
-
     while (!raylib.WindowShouldClose()) {
         //
         // Update
@@ -32,12 +42,16 @@ pub fn main() !void {
                 const db_path = try std.fs.path.joinZ(alloc, &[_][]const u8{ dir, file });
                 defer alloc.free(db_path);
 
-                const result = c.sqlite3_open(db_path.ptr, &db);
-                if (result != c.SQLITE_OK or db == null) {
-                    std.debug.print("[SQLite] err {}: {s}\n", .{ result, c.sqlite3_errmsg(db) });
-                    _ = c.sqlite3_close(db);
-                } else {
+                var db_opt: ?*c.sqlite3 = undefined;
+
+                const result = c.sqlite3_open(db_path.ptr, &db_opt);
+                if (result != c.SQLITE_OK) {
+                    std.debug.print("[SQLite] err {}: {s}\n", .{ result, c.sqlite3_errmsg(db_opt) });
+                    _ = c.sqlite3_close(db_opt);
+                }
+                if (db_opt) |db| {
                     std.debug.print("[SQLite] Success\n", .{});
+                    state = State{ .loaded = db };
                 }
             }
             file_dialog_state.SelectFilePressed = false;
@@ -51,14 +65,20 @@ pub fn main() !void {
             defer raylib.EndDrawing();
             raylib.ClearBackground(raylib.RAYWHITE);
 
-            {
-                if (file_dialog_state.windowActive) raylib.GuiLock();
-                defer raylib.GuiUnlock();
+            switch (state) {
+                .unloaded => {
+                    if (file_dialog_state.windowActive) raylib.GuiLock();
+                    defer raylib.GuiUnlock();
 
-                const button_size = 200;
-                if (raylib.GuiButton(.{ .x = (screen_width - button_size) / 2, .y = (screen_height - button_size) / 2, .width = 200, .height = 200 }, "Load db file") == 1) {
-                    file_dialog_state.windowActive = true;
-                }
+                    const button_size = 200;
+                    if (raylib.GuiButton(.{ .x = (screen_width - button_size) / 2, .y = (screen_height - button_size) / 2, .width = 200, .height = 200 }, "Load db file") == 1) {
+                        file_dialog_state.windowActive = true;
+                    }
+                },
+
+                .loaded => |*db| {
+                    _ = db;
+                },
             }
 
             raylib.GuiWindowFileDialog(&file_dialog_state);