#include <ncurses.h>
#include <curses.h>
#include <string>
#include <vector>
#include <fstream>

using std::string;
using std::vector;

#define adds(s) addstr(s.c_str())

// Global variables
vector<string> file(0);
int row = 0, col = 0;

enum mode_ty {
	insert, normal
};

// Load file to buffer
bool load(string filename) {
	std::ifstream infile(filename);
	if(!infile.good())
		return 1;
	string line;
	while (std::getline(infile, line))
		file.push_back(line);
	return 0;
}

// Save file from buffer
bool save(string filename) {
	std::ofstream outfile(filename);
	if(!outfile.good())
		return 1;
	for(string line : file)
		outfile << line << std::endl;
	return 0;
}

// Print file content
void print_file() {
	for(int i = 0; i < file.size(); i++) {
		move(i, 0);
		adds(file[i]);
	}
	move(row, col);
}

// TODO psaní do souboru
// TODO mazání v souboru
// TODO vkládání a mazání řádků
// TODO skoky a esuny
// TODO korování
// TODO hledání a nahrazování
// TODO undo

// Cursor movement
void move_cursor(char ch) {
	move(row, col);
	addch(file[row][col]);
	move(row, col);

	switch(ch) {
		case 'h':
			if(col > 0)
				move(row, --col);
			break;

		case 'j':
			if(row < file.size()-1) {
				move(++row, col);
				if(file[row].size() <= col) {
					col = file[row].size()-1;
					move(row, col);
				}
			}
			break;

		case 'k':
			if(row > 0) {
				move(--row, col);
				if(file[row].size() <= col) {
					col = file[row].size()-1;
					move(row, col);
				}
			}
			break;

		case 'l':
			if(col < file[row].size()-1)
				move(row, ++col);
			break;
	}
}

int main(int argc, char* argv[]) {
	
	// Init
	initscr();
	refresh();
	if(argc > 1 && load(argv[1]))
		return 1;
	if(argc > 1 && save(argv[1]))
		return 1;

	print_file();

	mode_ty mode = normal;

	// Main loop
	while(true) {
		char ch = getch();
		move_cursor( ch);
		refresh();
	}

	// End
	endwin();
	return 0;
}