const std = @import("std");

const Color = @This();

r: u8,
g: u8,
b: u8,
a: u8,

pub const black = Color{
    .r = 0,
    .g = 0,
    .b = 0,
    .a = 255,
};

pub fn parse(str: []const u8, hash_required: bool) !Color {
    var color = Color{
        .r = undefined,
        .g = undefined,
        .b = undefined,
        .a = 255,
    };

    if (str.len < 1) {
        return error.InvalidColorFormat;
    }

    const has_hash = str[0] == '#';
    if (hash_required and !has_hash) {
        return error.InvalidColorFormat;
    }

    const hex_str = if (has_hash) str[1..] else str;

    if (hex_str.len == 6) {
        color.r = try std.fmt.parseInt(u8, hex_str[0..2], 16);
        color.g = try std.fmt.parseInt(u8, hex_str[2..4], 16);
        color.b = try std.fmt.parseInt(u8, hex_str[4..6], 16);

    } else if (hex_str.len == 8) {
        color.a = try std.fmt.parseInt(u8, hex_str[0..2], 16);
        color.r = try std.fmt.parseInt(u8, hex_str[2..4], 16);
        color.g = try std.fmt.parseInt(u8, hex_str[4..6], 16);
        color.b = try std.fmt.parseInt(u8, hex_str[6..8], 16);

    } else {
        return error.InvalidColorFormat;
    }

    return color;
}