/* SPDX-FileCopyrightText: 2009 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

/** \file
 * \ingroup editors
 */

#pragma once

struct ARegion;
struct ID;
struct Main;
struct Scene;
struct SpaceNode;
struct Tex;
struct View2D;
struct bContext;
struct bNode;
struct bNodeSocketType;
struct bNodeTree;
struct bNodeTreeType;
struct bNodeType;

enum NodeBorder {
  NODE_TOP = 1,
  NODE_BOTTOM = 2,
  NODE_LEFT = 4,
  NODE_RIGHT = 8,
};
ENUM_OPERATORS(NodeBorder, NODE_RIGHT)

#define NODE_GRID_STEP_SIZE (20.0f * UI_SCALE_FAC) /* Based on the grid nodes snap to. */
#define NODE_EDGE_PAN_INSIDE_PAD 2
#define NODE_EDGE_PAN_OUTSIDE_PAD 0 /* Disable clamping for node panning, use whole screen. */
#define NODE_EDGE_PAN_SPEED_RAMP 1
#define NODE_EDGE_PAN_MAX_SPEED 26 /* In UI units per second, slower than default. */
#define NODE_EDGE_PAN_DELAY 0.5f
#define NODE_EDGE_PAN_ZOOM_INFLUENCE 0.5f

/* `clipboard.cc` */

void ED_node_clipboard_free();

/* `space_node.cc` */

void ED_node_cursor_location_get(const SpaceNode *snode, float value[2]);
void ED_node_cursor_location_set(SpaceNode *snode, const float value[2]);

int ED_node_tree_path_length(SpaceNode *snode);
/**
 * \param value: The path output at least the size of `ED_node_tree_path_length(snode) + 1`.
 */
void ED_node_tree_path_get(SpaceNode *snode, char *value);

void ED_node_tree_start(SpaceNode *snode, bNodeTree *ntree, ID *id, ID *from);
void ED_node_tree_push(SpaceNode *snode, bNodeTree *ntree, bNode *gnode);
void ED_node_tree_pop(SpaceNode *snode);
int ED_node_tree_depth(SpaceNode *snode);
bNodeTree *ED_node_tree_get(SpaceNode *snode, int level);

void ED_node_set_active_viewer_key(SpaceNode *snode);

/* `drawnode.cc` */

void ED_node_init_butfuncs();
void ED_init_custom_node_type(bNodeType *ntype);
void ED_init_custom_node_socket_type(bNodeSocketType *stype);
void ED_init_standard_node_socket_type(bNodeSocketType *stype);
void ED_init_node_socket_type_virtual(bNodeSocketType *stype);
void ED_node_sample_set(const float col[4]);
void ED_node_draw_snap(
    View2D *v2d, const float cent[2], float size, NodeBorder border, unsigned int pos);
void ED_node_type_draw_color(const char *idname, float *r_color);

/* `node_draw.cc` */

void ED_node_tree_update(const bContext *C);
void ED_node_tag_update_id(ID *id);

float ED_node_grid_size();

/* `node_edit.cc` */

void ED_node_set_tree_type(SpaceNode *snode, bNodeTreeType *typeinfo);
bool ED_node_is_compositor(SpaceNode *snode);
bool ED_node_is_shader(SpaceNode *snode);
bool ED_node_is_texture(SpaceNode *snode);
bool ED_node_is_geometry(SpaceNode *snode);
bool ED_node_supports_preview(SpaceNode *snode);

/**
 * Assumes nothing being done in ntree yet, sets the default in/out node.
 * Called from shading buttons or header.
 */
void ED_node_shader_default(const bContext *C, ID *id);
/**
 * Assumes nothing being done in ntree yet, sets the default in/out node.
 * Called from shading buttons or header.
 */
void ED_node_composit_default(const bContext *C, Scene *scene);
/**
 * Assumes nothing being done in ntree yet, sets the default in/out node.
 * Called from shading buttons or header.
 */
void ED_node_texture_default(const bContext *C, Tex *tex);
void ED_node_post_apply_transform(bContext *C, bNodeTree *ntree);
void ED_node_set_active(
    Main *bmain, SpaceNode *snode, bNodeTree *ntree, bNode *node, bool *r_active_texture_changed);

/**
 * Call after one or more node trees have been changed and tagged accordingly.
 *
 * This function will make sure that other parts of Blender update accordingly. For example, if the
 * node group interface changed, parent node groups have to be updated as well.
 *
 * Additionally, this will send notifiers and tag the depsgraph based on the changes. Depsgraph
 * relation updates have to be triggered by the caller.
 *
 * \param C: Context if available. This can be null.
 * \param bmain: Main whose data-blocks should be updated based on the changes.
 * \param ntree: Under some circumstances the caller knows that only one node tree has
 *   changed since the last update. In this case the function may be able to skip scanning #bmain
 *   for other things that have to be changed. It may still scan #bmain if the interface of the
 *   node tree has changed.
 */
void ED_node_tree_propagate_change(const bContext *C, Main *bmain, bNodeTree *ntree);

/**
 * \param scene_owner: is the owner of the job,
 * we don't use it for anything else currently so could also be a void pointer,
 * but for now keep it an 'Scene' for consistency.
 *
 * \note only call from spaces `refresh` callbacks, not direct! - use with care.
 */
void ED_node_composite_job(const bContext *C, bNodeTree *nodetree, Scene *scene_owner);

/* `node_ops.cc` */

void ED_operatormacros_node();

/* `node_view.cc` */

/**
 * Returns mouse position in image space.
 */
bool ED_space_node_get_position(
    Main *bmain, SpaceNode *snode, ARegion *region, const int mval[2], float fpos[2]);
/**
 * Returns color in linear space, matching #ED_space_image_color_sample().
 * And here we've got recursion in the comments tips...
 */
bool ED_space_node_color_sample(
    Main *bmain, SpaceNode *snode, ARegion *region, const int mval[2], float r_col[3]);