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#include "arch/video/vga/text.hpp"
#include "arch/boot/pointers.hpp"
#include "arch/video/vga/io.hpp"
#include "memory/asm_pointer.hpp"
#include <algorithm>
#include <string_view>
#include <utility>
namespace teachos::arch::video::vga::text
{
namespace
{
auto constexpr default_text_buffer_address = 0xb8000;
extern "C" std::pair<char, attribute> * vga_buffer_pointer;
auto constinit text_buffer = teachos::memory::asm_pointer{vga_buffer_pointer};
auto write(char code_point, attribute attribute) -> void
{
auto & p = *text_buffer;
(*p++) = std::pair{code_point, attribute};
};
} // namespace
auto clear(attribute attribute) -> void
{
*text_buffer = reinterpret_cast<decltype(text_buffer)::pointer>(default_text_buffer_address);
std::ranges::fill_n(*text_buffer, 2000, std::pair{' ', attribute});
}
auto cursor(bool enabled) -> void
{
auto cursor_disable_byte = std::byte{!enabled} << 5;
crtc::address_port::write(crtc::registers::cursor_start);
crtc::data_port::write(vga::crtc::data_port::read() | cursor_disable_byte);
}
auto write(std::string_view code_points, attribute attribute) -> void
{
std::ranges::for_each(code_points, [&](auto code_point) { write(code_point, attribute); });
}
} // namespace teachos::arch::video::vga::text
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