#include "line/mode.h"

#include <unistd.h>
#include <stdlib.h>
#include <iostream>
#include <print>

#include "line/cursor.h"
#include "line/getter.h"
#include "history.h"

using namespace std;

namespace ov4
{

void disable_raw()
{
    raw_enabled = false;
    tcsetattr(STDIN_FILENO, TCSAFLUSH, &attr);
}

void enable_raw()
{
    if (raw_enabled) return;
     
    raw_enabled = true;
    termios attr_raw;
    tcgetattr(STDIN_FILENO, &attr);
    tcgetattr(STDIN_FILENO, &attr_raw);

    // LOCAL

    // disable
    // echo
    // canonical
    // signal
    // disable post-input processing, aka control-V
    attr_raw.c_lflag &= ~(ECHO | ICANON | ISIG | IEXTEN);

    // INPUT

    // disable 
    // software flow control, aka control-S/Q
    // \n and \r conversion
    attr_raw.c_iflag &= ~(IXON | ICRNL);

    // OUTPUT

    // disable
    // post-output processing
    attr_raw.c_oflag &= ~(OPOST);

    // misc
    attr_raw.c_iflag &= ~(BRKINT | INPCK | ISTRIP);
    attr_raw.c_cflag |= (CS8);

    atexit(disable_raw);

    // TCSAFLUSH
    // the change shall occur after all output written to fildes is transmitted
    // and all input so far received but not read shall be discarded before the change is made
    tcsetattr(STDIN_FILENO, TCSAFLUSH, &attr_raw);
}

void clear_below()
{
    print("\x1b[0J");
}

string readline()
{
    update_window_size();
    history_vec.push_back("");
    history_index = get_last_index();
    reset_editor();

    T_position pos = get_cursor_position();
    prompt_pos = pos.col;
    char c;
    while (read(STDIN_FILENO, &c, 1) == 1)
    {
        if (iscntrl(c))
        {
            //print("control: {}\r\n", static_cast<unsigned char>(c));
            //fflush(stdout);
            if (c == 0x0A || c == 0x0D) // \n OR \r
            {
                //print("line: {}\r\n", line_buffer);
                if (line_buffer.empty())
                {
                    history_index--;
                    history_vec.pop_back();
                }
                else
                {
                    history_vec[get_last_index()] = line_buffer;
                }
                return line_buffer;
            }

            else if (c == 0x03) // control C
            {
                history_index--;
                history_vec.pop_back();
                return "";
            }

            // ESC sequence
            else if (c == '\x1b')
            {
                char seq[10];
                // eat [
                if (read(STDIN_FILENO, seq + 0, 1) != 1)
                    continue;

                if (read(STDIN_FILENO, seq + 1, 1) != 1)
                    continue;

                move_cursor(seq[1]);
            }
        }

        // normal char
        else
        {
            cursor_input_char(c);
            print_override(line_buffer);
        }
    }

    if (line_buffer.empty())
    {
        history_index--;
        history_vec.pop_back();
    }
    else
    {
        history_vec[get_last_index()] = line_buffer;
    }
    return line_buffer;
}

void editor_exit(int code)
{
    disable_raw();
    exit(code);
}


}