#pragma once

#include "pxl8_types.h"

static inline u32 pxl8_color_from_rgba(u32 rgba) {
    u8 r = (rgba >> 24) & 0xFF;
    u8 g = (rgba >> 16) & 0xFF;
    u8 b = (rgba >> 8) & 0xFF;
    u8 a = rgba & 0xFF;
    return r | ((u32)g << 8) | ((u32)b << 16) | ((u32)a << 24);
}

static inline u8 pxl8_color_lerp_channel(u8 c1, u8 c2, f32 t) {
    return c1 + (i32)((c2 - c1) * t);
}

static inline f32 pxl8_color_hue(u32 color) {
    u8 r = color & 0xFF;
    u8 g = (color >> 8) & 0xFF;
    u8 b = (color >> 16) & 0xFF;
    u8 max = r > g ? (r > b ? r : b) : (g > b ? g : b);
    u8 min = r < g ? (r < b ? r : b) : (g < b ? g : b);
    if (max == min) return 0.0f;
    f32 d = (f32)(max - min);
    f32 h;
    if (max == r) h = (f32)(g - b) / d + (g < b ? 6.0f : 0.0f);
    else if (max == g) h = (f32)(b - r) / d + 2.0f;
    else h = (f32)(r - g) / d + 4.0f;
    return h / 6.0f;
}

static inline f32 pxl8_color_hue_diff(f32 h1, f32 h2) {
    f32 d = h1 > h2 ? h1 - h2 : h2 - h1;
    return d > 0.5f ? 1.0f - d : d;
}

static inline f32 pxl8_color_luminance(u32 color) {
    u8 r = color & 0xFF;
    u8 g = (color >> 8) & 0xFF;
    u8 b = (color >> 16) & 0xFF;
    return 0.299f * r + 0.587f * g + 0.114f * b;
}

static inline f32 pxl8_color_saturation(u32 color) {
    u8 r = color & 0xFF;
    u8 g = (color >> 8) & 0xFF;
    u8 b = (color >> 16) & 0xFF;
    u8 max = r > g ? (r > b ? r : b) : (g > b ? g : b);
    u8 min = r < g ? (r < b ? r : b) : (g < b ? g : b);
    if (max == 0) return 0.0f;
    return (f32)(max - min) / (f32)max;
}

static inline u32 pxl8_color_to_rgba(u32 abgr) {
    u8 r = abgr & 0xFF;
    u8 g = (abgr >> 8) & 0xFF;
    u8 b = (abgr >> 16) & 0xFF;
    u8 a = (abgr >> 24) & 0xFF;
    return ((u32)r << 24) | ((u32)g << 16) | ((u32)b << 8) | a;
}

static inline u8 pxl8_rgb332_pack(u8 r, u8 g, u8 b) {
    return ((r >> 5) << 5) | ((g >> 5) << 2) | (b >> 6);
}

static inline void pxl8_rgb332_unpack(u8 c, u8* r, u8* g, u8* b) {
    u8 ri = (c >> 5) & 0x07;
    u8 gi = (c >> 2) & 0x07;
    u8 bi = c & 0x03;
    *r = (ri << 5) | (ri << 2) | (ri >> 1);
    *g = (gi << 5) | (gi << 2) | (gi >> 1);
    *b = (bi << 6) | (bi << 4) | (bi << 2) | bi;
}

static inline u32 pxl8_rgba32_pack(u8 r, u8 g, u8 b, u8 a) {
    return r | ((u32)g << 8) | ((u32)b << 16) | ((u32)a << 24);
}

static inline void pxl8_rgba32_unpack(u32 color, u8* r, u8* g, u8* b, u8* a) {
    *r = color & 0xFF;
    *g = (color >> 8) & 0xFF;
    *b = (color >> 16) & 0xFF;
    *a = (color >> 24) & 0xFF;
}