/* date = May 7th 2023 10:16 am */

#ifndef VN_FONT_H
#define VN_FONT_H

enum font_id
{
    Font_Regular,
    Font_Bold,
    Font_Monospace,
    Font_MonospaceOblique,
    Font_Fancy,
    Font_Icons,
    
    Font_Count,
};

#define FontIcon_None                 0x0000
#define FontIcon_Pencil               0xe800
#define FontIcon_Forward              0xe801
#define FontIcon_Book                 0xe802
#define FontIcon_FolderOpen           0xe803
#define FontIcon_Wrench               0xe804
#define FontIcon_CW                   0xe805
#define FontIcon_CCW                  0xe806
#define FontIcon_ArrowsCW             0xe807
#define FontIcon_ResizeVertical       0xe808
#define FontIcon_ResizeHorizontal     0xe809
#define FontIcon_Play                 0xe80a
#define FontIcon_Stop                 0xe80b
#define FontIcon_Floppy               0xe80c
#define FontIcon_Pause                0xe80d
#define FontIcon_Folder               0xe80e
#define FontIcon_Cog                  0xe80f
#define FontIcon_Attention            0xe810
#define FontIcon_Cancel               0xe811
#define FontIcon_Filter               0xf0b0
#define FontIcon_Menu                 0xf0c9
#define FontIcon_CircleEmpty          0xf10c
#define FontIcon_Circle               0xf111
#define FontIcon_Reply                0xf112
#define FontIcon_Terminal             0xf120
#define FontIcon_Ellipsis             0xf141
#define FontIcon_Document             0xe819
#define FontIcon_DocumentText         0xf15c
#define FontIcon_Eyedropper           0xf1fb
#define FontIcon_WindowMaximize       0xf2d0
#define FontIcon_WindowMinimize       0xf2d1
#define FontIcon_WindowRestore        0xf2d2
#define FontIcon_WindowClose          0xf2d4
#define FontIcon_DownDir              0xe812
#define FontIcon_UpDir                0xe813
#define FontIcon_LeftDir              0xe814
#define FontIcon_RightDir             0xe815
#define FontIcon_TextAlignLeft        0xe816
#define FontIcon_TextAlignCenter      0xe817
#define FontIcon_TextAlignRight       0xe818
#define FontIcon_DocumentInverted     0xf15b
#define FontIcon_DocumentInvertedText 0xf15c
#define FontIcon_DocumentFileImage    0xf1c5
#define FontIcon_DocumentFileAudio    0xf1c7
#define FontIcon_DocumentFileCode     0xf1c9
#define FontIcon_UserPlus             0xf234
#define FontIcon_UserTimes            0xf235
#define FontIcon_History              0xf235
#define FontIcon_Trash                0xf1f8
#define FontIcon_Debug                0xf188
#define FontIcon_Gamepad              0xf11b
#define FontIcon_Paste                0xf0ea
#define FontIcon_Cut                  0xe825
#define FontIcon_Lock                 0xe821
#define FontIcon_LockOpen             0xe822
#define FontIcon_Pin                  0xe820
#define FontIcon_User                 0xe81e
#define FontIcon_Users                0xe81f

struct glyph
{
    glyph *LRUNext;
    glyph *LRUPrev;
    
    font_id Font;
    u32 Codepoint;
    r32 Size;
    s32 Subpixel;
    
    v2_s32 P0;
    v2_s32 P1;
    v2 Offset;
    r32 Advance;
};

#define DEFAULT_GLYPH_ATLAS_DIM 1024*4
#define MAX_GLYPH_SIZE 128

#define STB_TRUETYPE_IMPLEMENTATION
#include "third_party/stb_truetype.h"

struct loaded_font
{
    stbtt_fontinfo Info;
    string Data;
    
    s32 Ascent;
    s32 Descent;
    s32 LineGap;
};

struct glyph_atlas
{
    arena *Arena;
    
    s32 MaxGlyphCount;
    s32 GlyphsUsed;
    glyph *Glyphs;
    
    glyph *LRUFirst;
    glyph *LRULast;
    
    vn_render_commands *RenderCommands;
    render_handle Texture;
    
    u8 *BitmapBuffer;
    s32 BitmapSize;
    s32 GlyphSize;
    
    loaded_font Fonts[Font_Count];
};

#endif //VN_FONT_H