#ifndef DRAW_H
#define DRAW_H

#include "gp.h"

struct font;
struct font_startup_receipt;

struct draw_startup_receipt { i32 _; };
struct draw_startup_receipt draw_startup(struct font_startup_receipt *font_sr);

/* ========================== *
 * Material
 * ========================== */

#define DRAW_MATERIAL_PARAMS(...) ((struct draw_material_params) { \
    .tint = COLOR_WHITE, \
    .clip = CLIP_ALL, \
    __VA_ARGS__ \
})

struct draw_material_params {
    struct xform xf;
    struct gp_resource *texture;  /* Overrides sprite if set */
    struct sprite_tag sprite;
    struct clip_rect clip;
    u32 tint;
    b32 is_light;
    struct v3 light_emittance;
};

void draw_material(struct gp_render_sig *sig, struct draw_material_params params);

/* ========================== *
 * Fill shapes
 * ========================== */

void draw_poly_ex(struct gp_render_sig *sig, struct v2_array vertices, struct gp_indices indices, u32 color);

void draw_poly(struct gp_render_sig *sig, struct v2_array points, u32 color);

void draw_circle(struct gp_render_sig *sig, struct v2 pos, f32 radius, u32 color, u32 detail);

void draw_quad(struct gp_render_sig *sig, struct quad quad, u32 color);

/* ========================== *
 * Line shapes
 * ========================== */

void draw_gradient_line(struct gp_render_sig *sig, struct v2 start, struct v2 end, f32 thickness, u32 start_color, u32 end_color);

void draw_line(struct gp_render_sig *sig, struct v2 start, struct v2 end, f32 thickness, u32 color);

void draw_ray(struct gp_render_sig *sig, struct v2 pos, struct v2 rel, f32 thickness, u32 color);

void draw_poly_line(struct gp_render_sig *sig, struct v2_array points, b32 loop, f32 thickness, u32 color);

void draw_circle_line(struct gp_render_sig *sig, struct v2 pos, f32 radius, f32 thickness, u32 color, u32 detail);

void draw_quad_line(struct gp_render_sig *sig, struct quad quad, f32 thickness, u32 color);

void draw_arrow_line(struct gp_render_sig *sig, struct v2 start, struct v2 end, f32 thickness, f32 arrowhead_height, u32 color);

void draw_arrow_ray(struct gp_render_sig *sig, struct v2 pos, struct v2 rel, f32 thickness, f32 arrowhead_height, u32 color);

void draw_collider_line(struct gp_render_sig *sig, struct collider_shape shape, struct xform shape_xf, f32 thickness, u32 color, u32 detail);

/* ========================== *
 * Grid
 * ========================== */

void draw_grid(struct gp_render_sig *sig, struct xform xf, u32 bg0_color, u32 bg1_color, u32 line_color, u32 x_color, u32 y_color, f32 thickness, f32 spacing, struct v2 offset);

/* ========================== *
 * UI
 * ========================== */

#define DRAW_UI_RECT_PARAMS(...) ((struct draw_ui_rect_params) { \
    .tint = COLOR_WHITE, \
    .clip = CLIP_ALL, \
    __VA_ARGS__ \
})

struct draw_ui_rect_params {
    struct xform xf;
    struct gp_resource *texture;  /* Overrides sprite if set */
    struct sprite_tag sprite;
    struct clip_rect clip;
    u32 tint;
};

void draw_ui_rect(struct gp_render_sig *sig, struct draw_ui_rect_params params);

/* ========================== *
 * Text
 * ========================== */

#define DRAW_TEXT_PARAMS(...) ((struct draw_text_params) { \
    .scale = 1.0, \
    .alignment = DRAW_TEXT_ALIGNMENT_LEFT, \
    .offset_x = DRAW_TEXT_OFFSET_X_LEFT, \
    .offset_y = DRAW_TEXT_OFFSET_Y_TOP, \
    .color = COLOR_WHITE, \
    __VA_ARGS__ \
})

/* How is text aligned within its area */
enum draw_text_alignment {
    DRAW_TEXT_ALIGNMENT_LEFT,  /* Default */
    DRAW_TEXT_ALIGNMENT_CENTER,
    DRAW_TEXT_ALIGNMENT_RIGHT
};

/* How does the specified text position relate to the text area.
 * E.g. BOTTOM & RIGHT means the bottom-right of the text area will snap to
 * the specified position. */
enum draw_text_offset_x {
    DRAW_TEXT_OFFSET_X_LEFT,  /* Default */
    DRAW_TEXT_OFFSET_X_CENTER,
    DRAW_TEXT_OFFSET_X_RIGHT
};

enum draw_text_offset_y {
    DRAW_TEXT_OFFSET_Y_TOP,  /* Default */
    DRAW_TEXT_OFFSET_Y_CENTER,
    DRAW_TEXT_OFFSET_Y_BOTTOM
};

struct draw_text_params {
    struct font *font;
    struct v2 pos;
    f32 scale;
    u32 color;
    enum draw_text_alignment alignment;
    enum draw_text_offset_x offset_x;
    enum draw_text_offset_y offset_y;
    struct string str;
};

struct rect draw_text(struct gp_render_sig *sig, struct draw_text_params params);

#endif