// Buffer.cpp

#include "Buffer.h"

using namespace std;

void Buffer::display() const
{
    int ix_stop_line = ix_top_line_ + window_height_;

    for (int i = ix_top_line_; i < ix_stop_line; ++i) {
        if (i <= v_lines_.size()) {
            if (i == ix_current_line_)
                cout << '>';
            else
                cout << ' ';
            cout << std::setw(5) << i+1;
            if (i < v_lines_.size())
                cout << "  " << v_lines_[i];
        }
        cout << '\n';
    }
}

bool Buffer::open(const string & new_file_name)
{
    std::ifstream file(new_file_name);
    if (!file)
        return false;

    v_lines_.clear();

    string line;
    while (getline(file, line))
        v_lines_.push_back(line);

    file_name_ = new_file_name;
    ix_current_line_ = ix_top_line_ = 0;
    return true;
}

bool Buffer::save(const string & new_file_name)
{
    std::ofstream file(new_file_name);
    if (!file)
        return false;

    file_name_ = new_file_name;
    for (const string & line : v_lines_)
        file << line << endl;
    return true;
}