/* SPDX-License-Identifier: GPL-2.0-or-later */

/** \file
 * \ingroup DNA
 *
 * Use API in BKE_workspace.h to edit these.
 */

#pragma once

#include "DNA_ID.h"
#include "DNA_asset_types.h"
#include "DNA_viewer_path_types.h"

#ifdef __cplusplus
extern "C" {
#endif

/** #bToolRef_Runtime.flag */
enum {
  /**
   * This tool should use the fallback key-map.
   * Typically gizmos handle this but some tools (such as the knife tool) don't use a gizmo.
   */
  TOOLREF_FLAG_FALLBACK_KEYMAP = (1 << 0),
};

#
#
typedef struct bToolRef_Runtime {
  int cursor;

  /** One of these 3 must be defined. */
  char keymap[64];
  char gizmo_group[64];
  char data_block[64];

  /** Keymap for #bToolRef.idname_fallback, if set. */
  char keymap_fallback[64];

  /** Use to infer primary operator to use when setting accelerator keys. */
  char op[64];

  /** Index when a tool is a member of a group. */
  int index;
  /** Options: `TOOLREF_FLAG_*`. */
  int flag;
} bToolRef_Runtime;

/**
 * \note Stored per mode.
 */
typedef struct bToolRef {
  struct bToolRef *next, *prev;
  char idname[64];

  /** Optionally use these when not interacting directly with the primary tools gizmo. */
  char idname_fallback[64];

  /** Use to avoid initializing the same tool multiple times. */
  short tag;

  /** #bToolKey (space-type, mode), used in 'WM_api.h' */
  short space_type;
  /**
   * Value depends on the 'space_type', object mode for 3D view, image editor has own mode too.
   * RNA needs to handle using item function.
   */
  int mode;

  /**
   * Use for tool options, each group's name must match a tool name:
   *
   *    {"Tool Name": {"SOME_OT_operator": {...}, ..}, ..}
   *
   * This is done since different tools may call the same operators with their own options.
   */
  IDProperty *properties;

  /** Variables needed to operate the tool. */
  bToolRef_Runtime *runtime;
} bToolRef;

/**
 * \brief Wrapper for bScreen.
 *
 * #bScreens are IDs and thus stored in a main list-base.
 * We also want to store a list-base of them within the workspace
 * (so each workspace can have its own set of screen-layouts)
 * which would mess with the next/prev pointers.
 * So we use this struct to wrap a bScreen pointer with another pair of next/prev pointers.
 */
typedef struct WorkSpaceLayout {
  struct WorkSpaceLayout *next, *prev;

  struct bScreen *screen;
  /* The name of this layout, we override the RNA name of the screen with this
   * (but not ID name itself) */
  /** MAX_NAME. */
  char name[64];
} WorkSpaceLayout;

/** Optional tags, which features to use, aligned with #bAddon names by convention. */
typedef struct wmOwnerID {
  struct wmOwnerID *next, *prev;
  /** MAX_NAME. */
  char name[64];
} wmOwnerID;

typedef struct WorkSpace {
  ID id;

  /** WorkSpaceLayout. */
  ListBase layouts;
  /* Store for each hook (so for each window) which layout has
   * been activated the last time this workspace was visible. */
  /** WorkSpaceDataRelation. */
  ListBase hook_layout_relations;

  /* Feature tagging (use for addons) */
  /** #wmOwnerID. */
  ListBase owner_ids;

  /** List of #bToolRef */
  ListBase tools;

  /** Optional, scene to switch to when enabling this workspace (NULL to disable). Cleared on
   * link/append. */
  struct Scene *pin_scene;

  char _pad[4];

  int object_mode;

  /** Enum eWorkSpaceFlags. */
  int flags;

  /** Number for workspace tab reordering in the UI. */
  int order;

  /** Info text from modal operators (runtime). */
  char *status_text;

  /** Workspace-wide active asset library, for asset UIs to use (e.g. asset view UI template). The
   * Asset Browser has its own and doesn't use this. */
  AssetLibraryReference asset_library_ref;

  /**
   * Ground truth for the currently active viewer node. When a viewer node is activated its path is
   * set here. Editors can check here for which node is active (currently the node editor,
   * spreadsheet and viewport do this).
   */
  ViewerPath viewer_path;
} WorkSpace;

/**
 * Generic (and simple/primitive) struct for storing a history of assignments/relations
 * of workspace data to non-workspace data in a listbase inside the workspace.
 *
 * Using this we can restore the old state of a workspace if the user switches back to it.
 *
 * Usage
 * =====
 * When activating a workspace, it should activate the screen-layout that was active in that
 * workspace before *in this window*.
 * More concretely:
 * * There are two windows, win1 and win2.
 * * Both show workspace ws1, but both also had workspace ws2 activated at some point before.
 * * Last time ws2 was active in win1, screen-layout sl1 was activated.
 * * Last time ws2 was active in win2, screen-layout sl2 was activated.
 * * When changing from ws1 to ws2 in win1, screen-layout sl1 should be activated again.
 * * When changing from ws1 to ws2 in win2, screen-layout sl2 should be activated again.
 * So that means we have to store the active screen-layout in a per workspace, per window
 * relation. This struct is used to store an active screen-layout for each window within the
 * workspace.
 * To find the screen-layout to activate for this window-workspace combination, simply lookup
 * the WorkSpaceDataRelation with the workspace-hook of the window set as parent.
 */
typedef struct WorkSpaceDataRelation {
  struct WorkSpaceDataRelation *next, *prev;

  /** The data used to identify the relation
   * (e.g. to find screen-layout (= value) from/for a hook).
   * NOTE: Now runtime only. */
  void *parent;
  /** The value for this parent-data/workspace relation. */
  void *value;

  /** Reference to the actual parent window, wmWindow->winid. Used in read/write code. */
  int parentid;
  char _pad_0[4];
} WorkSpaceDataRelation;

/**
 * Little wrapper to store data that is going to be per window, but coming from the workspace.
 * It allows us to keep workspace and window data completely separate.
 */
typedef struct WorkSpaceInstanceHook {
  WorkSpace *active;
  struct WorkSpaceLayout *act_layout;

  /**
   * Needed because we can't change work-spaces/layouts in running handler loop,
   * it would break context.
   */
  WorkSpace *temp_workspace_store;
  struct WorkSpaceLayout *temp_layout_store;
} WorkSpaceInstanceHook;

typedef enum eWorkSpaceFlags {
  WORKSPACE_USE_FILTER_BY_ORIGIN = (1 << 1),
  WORKSPACE_USE_PIN_SCENE = (1 << 2),
} eWorkSpaceFlags;

#ifdef __cplusplus
}
#endif