USING_SDL :: OS == .LINUX || OS == .MACOS;
USING_WINDOWS :: OS == .WINDOWS;

#if !USING_SDL && !USING_WINDOWS
  #assert false "Invalid configuration";

// The arena and fixed_arena suites live in modules/Basic/tests and arrive with LOAD_TESTS
// on the Basic import below.
#if COMPILE_TESTS {
  #load "test/testing.jai";
  #load "test/logger_tests.jai";
}

#load "app/main.jai"; // entry point
#load "app/app_ui.jai";
#load "app/viewer.jai";
#load "app/ocr_ui.jai";
#load "app/exit_shutdown.jai";

#load "base/circle_buffer.jai";
#load "base/debug.jai";
#load "base/fonts.jai";
#load "base/log_queue.jai";
#load "base/logger.jai";
#load "base/prune_files.jai";

#load "ui/imgui.jai";
#load "ui/imgui_keyboard.jai";
#load "ui/imgui_theme.jai";
#load "ui/imgui_theme_file.jai";
#load "ui/imgui_theme_registry.jai";
#load "ui/imgui_theme_editor.jai";
#load "ui/imgui_toast.jai";
#load "ui/imgui_exit_overlay.jai";

#import "Atomics";
#import "Basic"()(MEMORY_DEBUGGER=false,ARENA_DEBUG=DEBUG,LOAD_TESTS=COMPILE_TESTS);
#import "Clipboard";
#import "String";
#import "Sort";
#import "Unicode";
#import "File";
#import "File_Utilities";
#import "Math";
#import "System";
#import "Thread";
#import "Hash_Table";
Shared_Channel :: #import "Shared_Memory_Channel";
#import "stb_image";
#import "stb_image_resize";
#import "Capture_File";   // the .mcap format, copied from D:\SnagitIndex\SnagitConverter
#import "OCR";
#import "onnxruntime";

// Basic's arenas import Secure_Memory at its defaults; this import adds its test suite.
using Secure_Memory :: #import "Secure_Memory"()(LOAD_TESTS=COMPILE_TESTS);

Graphics_Backend :: enum s32 {
  Unknown :: 0;
  DX11;
  Vulkan;
  OpenGL;
  Metal;
  DX12;
}

graphics_backend_from_string :: (name: string) -> Graphics_Backend {
  if name == {
    case "vulkan"; return .Vulkan;
    case "opengl"; return .OpenGL;
    case "metal";  return .Metal;
    case "direct3d11"; return .DX11;
    case "direct3d12"; return .DX12;
  }
  assert(false, "Unknown Graphics_Backend!");
  return .Unknown;
}

Memory_Usage :: struct {
  working_set: s64;
  virtual_memory: s64;
  peak_working_set: s64;
  peak_virtual_memory: s64;
}

perf: Perf;
Perf :: struct {
  backend: Graphics_Backend;
  renderer_name: string;
  adapter_name: string;         // e.g. "NVIDIA GeForce RTX 4070"; empty when the adapter could not be queried
  renderer_is_software: bool;
  time_to_first_frame_ms: float64;

  // See #WarpFirstStartup in graphics/DX11.jai. hw_device_ready_ms is measured from app.startup_time.
  started_on_warp: bool;
  startup_device_ms: float64;      // D3D11CreateDevice for the startup device
  startup_swap_chain_ms: float64;  // its swap chain and render target
  hw_device_create_ms: float64;
  hw_device_ready_ms: float64;
  hw_swap_ms: float64;

  memory_usage: Memory_Usage;

  frame_times: Circle_Buffer(Frame_Timing);
}

Frame_Timing :: struct {
  work:  float32; // seconds from the start of app_frame to just before Present (doesn't include vsync or swapchain waits)
  delta: float32; // io.DeltaTime: wall time since the previous frame, vsync wait included
}

PERF_FRAME_TIME_HISTORY :: 1024;

load_hardware_information :: () {
  { // Get CPU information:
    using cpu_info;
    physical_cpu_count     = get_number_of_processors(.ALL_PHYSICAL);
    logical_cpu_count      = get_number_of_processors(.ALL_LOGICAL);
    performance_cpu_count  = get_number_of_processors(.PERFORMANCE_PHYSICAL);
  }
  #if OS == .WINDOWS windows_get_cpu_information();
}

load_platform_information :: () {
  platform_load_platform_information();
}

cpu_info: CPU_Info;
CPU_Info :: struct {
  logical_cpu_count: s32;
  physical_cpu_count: s32;
  performance_cpu_count: s32;
}

CPUID_Type :: enum s32 {
  All         :: 0; // All Logical CPUs
  Performance :: 1;
  Efficiency  :: 2;

  // Top_Performance :: 64; // Typically two CPUs are marked with this value
}

platform: Platform; // Windows, MacOS, Linux

app: App;
App :: struct {
  frame_count: s64;
  startup_time: Apollo_Time;
  frame_time: Apollo_Time;

  win_scale: float32;
  minimized_to_tray: bool;
  was_minimized_to_tray: bool;   // as of the last frame; main.jai drops stale input when it changes
  vsync_on: bool = true;
  sleep_on_fast_frame: bool = false;
  should_exit: bool = false;

  show_debug_panel: bool = DEBUG;
  show_logger_panel: bool = DEBUG;
  show_frame_time_graph: bool = DEBUG;
  show_style_editor: bool;
  minimize_to_tray_this_frame: bool;
  restore_window_this_frame: bool;
  is_master: bool; // Are we the first instance of this app launched?
  allow_multiple_instances: bool; // Skips the single-instance check, so a dev build can run beside an installed one.
  should_exit_early: bool;
  run_tests: bool;
  headless: bool;    // -headless (or a no_crash_dialog build): no message boxes on failures, and run_tests exits when done
  exit_code: s32;    // the process's exit code when the main loop ends
  last_window_restore_time: Apollo_Time;

  imgui_context: *ImGui.ImGuiContext;

  write_channel: Shared_Channel.Write_Channel;
  read_channel: Shared_Channel.Read_Channel;
  read_channel_fatal_errors: s32;   // the first resets the queue, the second stops polling

  large_pages_allowed: bool;
  #if USING_WINDOWS {
    is_admin: bool;            // running with elevated privileges?
    ui_global_clear_color: [4]float : .[0.45, 0.55, 0.60, 1.00];
  } else #if USING_SDL {
    ui_global_clear_color: SDL_FColor = .{ r=0.45, g=0.55, b=0.60, a=1.0 };
  }

  program_data_dir: string;   // "<os program data>/<APP_FOLDER_NAME>"; see app_program_data_dir()
  machine_name: string;
  username: string;
  args: []string;
}

#if USING_SDL {
  // This uses SDL3 and SDL_GPU
  ImGui :: #import "imgui-sdl";

  #import "sdl3";
  #import "freetype";

  // Load the backend(s) you want. This *must* be #load because they might rely on other libraries.
  // In this case, sdl3_gpu3 relies on types from "sdl3", so by importing sdl3 and loading imgui, imgui
  // gets access to the types it needs.
  #load "backends/sdl3_gpu3.jai";
  #load "freetype/freetype.jai";

  #load "base/platform/sdl.jai";

  #load "base/platform/platform_posix.jai";
  #if OS == .LINUX {
    #load "base/platform/platform_linux.jai";
    POSIX :: #import "POSIX";
  }
  else #if OS == .MACOS {
    #load "base/platform/platform_macos.jai";
    #load "base/platform/macos_bindings.jai";
    #load "base/platform/macos_global_hotkeys.jai";
    POSIX :: #import "POSIX";
  }

  APP_TRAY_ICON_PATH :: "images/tray_icon.png";
}

#if USING_WINDOWS {
  // This uses Win32 API directly and DX11 for graphics
  ImGui :: #import "imgui-dx11-win32"()(DEBUG = DEBUG);

  #import "d3d11";
  #import "d3d_compiler";
  #import "dxgi";

  #import "Windows";
  #import "Windows_Utf8";

  #load "base/platform/platform_windows.jai";
  #load "base/platform/win32_bindings.jai";
  #load "graphics/DX11.jai";

  APP_TRAY_ICON_PATH :: "images/tray_icon.ico";
}

// The folder the app's data, logs and images live in: the executable's, or on macOS the one
// holding the .app when run from the bundle, so replacing the bundle leaves the data alone. Ends in
// a separator, as path_strip_filename does. Set by the first call, which the logger makes at startup.
app_install_directory :: () -> string {
  if !app_install_directory_path {
    directory := path_strip_filename(get_path_of_running_executable(,, temp));
    #if OS == .MACOS {
      BUNDLE_EXECUTABLE_FOLDER :: "/Contents/MacOS/";
      if ends_with(directory, tprint(".app%", BUNDLE_EXECUTABLE_FOLDER)) {
        directory = path_strip_filename(slice(directory, 0, directory.count - BUNDLE_EXECUTABLE_FOLDER.count));
        app_from_app_bundle = true;
      }
    }
    app_install_directory_path = copy_string(directory,, context.default_allocator);
  }
  return app_install_directory_path;
}

app_running_from_app_bundle :: () -> bool {
  app_install_directory();
  return app_from_app_bundle;
}

#scope_file
app_install_directory_path: string;
app_from_app_bundle: bool;
#scope_export

get_app_tray_icon_path :: () -> string {
  push_allocator(temp);
  icon_path := tprint("%1%2", app_install_directory(), APP_TRAY_ICON_PATH);
  log("icon_path: %", icon_path);
  return icon_path;
}

APP_LOG_DIRECTORY :: #run -> string {
  return tprint("logs/%", VERSION);
}
APP_USER_SETTINGS_FILE_NAME :: "settings.config";
APP_USER_SETTINGS_VERSION :: 1;
// A file at any version from this one through APP_USER_SETTINGS_VERSION is readable. Raise
// APP_USER_SETTINGS_VERSION when an action is added to [hotkeys] or [global_hotkeys]; see
// hotkeys_missing_lines.
APP_USER_SETTINGS_OLDEST_READABLE_VERSION :: 1;

APP_SHARED_MEMORY_CHANNEL_HEADER_SIZE :: 2;   // 1 byte for message-or-done, 1 byte for the checksum.
App_Shared_Memory_Tag :: enum u8 {
  Done :: 0;
  Bring_To_Front :: 1;
}

APP_SHARED_MEMORY_CHANNEL_BYTES :: 4096; // only one page?

APP_WINDOW_TITLE :: #run -> string {
  append_debug := ifx DEBUG then " (DEBUG)\0" else " (RELEASE)\0";
  git_info := ifx GIT_BRANCH != "master" && GIT_BRANCH != "main" then
    tprint(" %-%", GIT_BRANCH, GIT_HASH) else tprint(" %", GIT_HASH);
  return tprint("%1 %2%3%4", APP_NAME, VERSION,
    git_info, append_debug);
}

APP_TRAY_TOOLTIP_TEXT :: #run -> string {
  return ifx DEBUG
      tprint("% % (DEBUG)\0", APP_NAME, VERSION)
    else
      tprint("% %\0", APP_NAME, VERSION);
}

#if OS == .LINUX {
  clipboard_set_text :: (text: string) {
    ImGui.SetClipboardText(temp_c_string(text));
  }
} else {
  clipboard_set_text :: (text: string) {
    os_clipboard_set_text(text);
  }
}