// ideDesigner.h -- DVX BASIC form designer
//
// Design-time data model and design surface for visual form editing.
// Controls are stored as pure data (not live widgets) and rendered
// onto a Canvas widget. The designer reads and writes .frm files.

#ifndef IDE_DESIGNER_H
#define IDE_DESIGNER_H

#include "dvxApp.h"
#include "dvxWidget.h"
#include "widgetCanvas.h"

#include "stb_ds_wrap.h"

#include <stdint.h>
#include <stdbool.h>

// ============================================================
// Limits
// ============================================================

#define DSGN_MAX_NAME      32
#define DSGN_MAX_TEXT       256
#define DSGN_MAX_PROPS     32
#define DSGN_GRID_SIZE     8
#define DSGN_HANDLE_SIZE   6

// ============================================================
// Design-time property (stored as key=value strings)
// ============================================================

typedef struct {
    char name[DSGN_MAX_NAME];
    char value[DSGN_MAX_TEXT];
} DsgnPropT;

// ============================================================
// Design-time control
// ============================================================

typedef struct {
    char       name[DSGN_MAX_NAME];
    char       typeName[DSGN_MAX_NAME];
    int32_t    left;
    int32_t    top;
    int32_t    width;
    int32_t    height;
    int32_t    tabIndex;
    DsgnPropT  props[DSGN_MAX_PROPS];
    int32_t    propCount;
} DsgnControlT;

// ============================================================
// Design-time form
// ============================================================

typedef struct {
    char            name[DSGN_MAX_NAME];
    char            caption[DSGN_MAX_TEXT];
    int32_t         width;
    int32_t         height;
    DsgnControlT   *controls;      // stb_ds dynamic array
    bool            dirty;
} DsgnFormT;

// ============================================================
// Toolbox tool IDs
// ============================================================

typedef enum {
    TOOL_POINTER = 0,
    TOOL_BUTTON,
    TOOL_LABEL,
    TOOL_TEXTBOX,
    TOOL_CHECKBOX,
    TOOL_OPTION,
    TOOL_FRAME,
    TOOL_LISTBOX,
    TOOL_COMBOBOX,
    TOOL_HSCROLL,
    TOOL_VSCROLL,
    TOOL_TIMER,
    TOOL_PICTURE,
    TOOL_IMAGE,
    TOOL_COUNT
} DsgnToolE;

// ============================================================
// Grab handle IDs
// ============================================================

typedef enum {
    HANDLE_NONE = -1,
    HANDLE_NW = 0,
    HANDLE_N,
    HANDLE_NE,
    HANDLE_E,
    HANDLE_SE,
    HANDLE_S,
    HANDLE_SW,
    HANDLE_W,
    HANDLE_COUNT = 8
} DsgnHandleE;

// ============================================================
// Interaction mode
// ============================================================

typedef enum {
    DSGN_IDLE,
    DSGN_PLACING,
    DSGN_DRAWING,
    DSGN_MOVING,
    DSGN_RESIZING
} DsgnModeE;

// ============================================================
// Designer state
// ============================================================

typedef struct {
    DsgnFormT     *form;
    int32_t        selectedIdx;     // -1 = form itself selected
    DsgnToolE      activeTool;
    DsgnModeE      mode;
    DsgnHandleE    activeHandle;
    int32_t        dragStartX;
    int32_t        dragStartY;
    int32_t        dragOrigLeft;
    int32_t        dragOrigTop;
    int32_t        dragOrigWidth;
    int32_t        dragOrigHeight;
    int32_t        drawX;           // rubber-band start for new control
    int32_t        drawY;
    bool           showGrid;
    bool           snapToGrid;
    WidgetT       *canvas;
    AppContextT   *ctx;
} DsgnStateT;

// ============================================================
// API
// ============================================================

// Initialize designer state.
void dsgnInit(DsgnStateT *ds, AppContextT *ctx);

// Set the canvas widget for rendering.
void dsgnSetCanvas(DsgnStateT *ds, WidgetT *canvas);

// Load a .frm file into the designer.
bool dsgnLoadFrm(DsgnStateT *ds, const char *source, int32_t sourceLen);

// Save the designer form to .frm text format.
// Returns the number of bytes written (excluding null), or -1 on error.
int32_t dsgnSaveFrm(const DsgnStateT *ds, char *buf, int32_t bufSize);

// Create a new blank form.
void dsgnNewForm(DsgnStateT *ds, const char *name);

// Repaint the design surface.
void dsgnPaint(DsgnStateT *ds);

// Handle mouse click on the design surface.
void dsgnOnMouse(DsgnStateT *ds, int32_t x, int32_t y, bool drag);

// Handle key press in design view.
void dsgnOnKey(DsgnStateT *ds, int32_t key);

// Get the name of the selected control (or form name if nothing selected).
const char *dsgnSelectedName(const DsgnStateT *ds);

// Get the default event name for a control type.
const char *dsgnDefaultEvent(const char *typeName);

// Get the VB type name for a tool ID.
const char *dsgnToolTypeName(DsgnToolE tool);

// Auto-generate a unique control name for the given type.
void dsgnAutoName(const DsgnStateT *ds, const char *typeName, char *buf, int32_t bufSize);

// Free designer resources.
void dsgnFree(DsgnStateT *ds);

#endif // IDE_DESIGNER_H