// dvx_wm.h — Layer 4: Window manager for DV/X GUI
#ifndef DVX_WM_H
#define DVX_WM_H

#include "dvxTypes.h"

// Initialize window stack
void wmInit(WindowStackT *stack);

// Create a new window and add it to the stack (raised to top)
WindowT *wmCreateWindow(WindowStackT *stack, DisplayT *d, const char *title, int32_t x, int32_t y, int32_t w, int32_t h, bool resizable);

// Destroy a window and remove from stack
void wmDestroyWindow(WindowStackT *stack, WindowT *win);

// Raise a window to the top of the stack
void wmRaiseWindow(WindowStackT *stack, DirtyListT *dl, int32_t idx);

// Set focus to a window (by stack index)
void wmSetFocus(WindowStackT *stack, DirtyListT *dl, int32_t idx);

// Recalculate content area geometry from frame dimensions
void wmUpdateContentRect(WindowT *win);

// Reallocate content buffer after resize
int32_t wmReallocContentBuf(WindowT *win, const DisplayT *d);

// Add a menu bar to a window
MenuBarT *wmAddMenuBar(WindowT *win);

// Add a menu to a menu bar
MenuT *wmAddMenu(MenuBarT *bar, const char *label);

// Add an item to a menu
void wmAddMenuItem(MenuT *menu, const char *label, int32_t id);

// Add a separator to a menu
void wmAddMenuSeparator(MenuT *menu);

// Add a vertical scrollbar to a window
ScrollbarT *wmAddVScrollbar(WindowT *win, int32_t min, int32_t max, int32_t pageSize);

// Add a horizontal scrollbar to a window
ScrollbarT *wmAddHScrollbar(WindowT *win, int32_t min, int32_t max, int32_t pageSize);

// Draw window chrome (frame, title bar, menu bar) clipped to a dirty rect
void wmDrawChrome(DisplayT *d, const BlitOpsT *ops, const BitmapFontT *font, const ColorSchemeT *colors, WindowT *win, const RectT *clipTo);

// Draw window content clipped to a dirty rect
void wmDrawContent(DisplayT *d, const BlitOpsT *ops, WindowT *win, const RectT *clipTo);

// Draw scrollbars for a window
void wmDrawScrollbars(DisplayT *d, const BlitOpsT *ops, const ColorSchemeT *colors, WindowT *win, const RectT *clipTo);

// Draw minimized window icons at bottom of screen
void wmDrawMinimizedIcons(DisplayT *d, const BlitOpsT *ops, const ColorSchemeT *colors, const WindowStackT *stack, const RectT *clipTo);

// Hit test: which part of which window is at screen position (mx, my)?
// Returns stack index or -1 if no window hit
// Sets *hitPart: 0=content, 1=title, 2=close button, 3=resize edge,
//                4=menu bar, 5=vscroll, 6=hscroll, 7=minimize, 8=maximize
int32_t wmHitTest(const WindowStackT *stack, int32_t mx, int32_t my, int32_t *hitPart);

// Detect which resize edge(s) are hit (returns RESIZE_xxx flags)
int32_t wmResizeEdgeHit(const WindowT *win, int32_t mx, int32_t my);

// Handle window drag (call each mouse move during drag)
void wmDragMove(WindowStackT *stack, DirtyListT *dl, int32_t mouseX, int32_t mouseY);

// Handle window resize (call each mouse move during resize)
void wmResizeMove(WindowStackT *stack, DirtyListT *dl, const DisplayT *d, int32_t mouseX, int32_t mouseY);

// Begin dragging a window
void wmDragBegin(WindowStackT *stack, int32_t idx, int32_t mouseX, int32_t mouseY);

// End dragging
void wmDragEnd(WindowStackT *stack);

// Begin resizing a window
void wmResizeBegin(WindowStackT *stack, int32_t idx, int32_t edge, int32_t mouseX, int32_t mouseY);

// End resizing
void wmResizeEnd(WindowStackT *stack);

// Set window title
void wmSetTitle(WindowT *win, DirtyListT *dl, const char *title);

// Handle scrollbar click (arrow buttons, trough, or begin thumb drag)
void wmScrollbarClick(WindowStackT *stack, DirtyListT *dl, int32_t idx, int32_t orient, int32_t mx, int32_t my);

// Handle ongoing scrollbar thumb drag
void wmScrollbarDrag(WindowStackT *stack, DirtyListT *dl, int32_t mx, int32_t my);

// End scrollbar thumb drag
void wmScrollbarEnd(WindowStackT *stack);

// Maximize a window (saves current geometry, expands to screen/max bounds)
void wmMaximize(WindowStackT *stack, DirtyListT *dl, const DisplayT *d, WindowT *win);

// Minimize a window (hides window, shows icon at bottom of screen)
void wmMinimize(WindowStackT *stack, DirtyListT *dl, WindowT *win);

// Hit-test minimized icons at bottom of screen
// Returns stack index of the minimized window, or -1
int32_t wmMinimizedIconHit(const WindowStackT *stack, const DisplayT *d, int32_t mx, int32_t my);

// Restore a maximized window to its pre-maximize geometry
void wmRestore(WindowStackT *stack, DirtyListT *dl, const DisplayT *d, WindowT *win);

// Restore a minimized window
void wmRestoreMinimized(WindowStackT *stack, DirtyListT *dl, WindowT *win);

// Load an icon image for a window (converts to display pixel format)
int32_t wmSetIcon(WindowT *win, const char *path, const DisplayT *d);

#endif // DVX_WM_H