#include <ncurses.h>
#include <curses.h>
#include <fstream>
#include <iostream>

#define TAB_SIZE 2

using std::string;
typedef unsigned long long count_type;

// Position
struct position {
	count_type r, c;
	position operator+(count_type offset) { return {r + offset, c}; }
};

//// 	Treap
// Treap node representation of a line
struct line {
	count_type priority, size;
	string text;
	line *left, *right;

	line(count_type _p, string _t) : priority(_p), text(_t), size(1), left(nullptr), right(nullptr) {}
};
typedef std::pair<line*, line*> two_lines;

// Treap data structure
class Treap {
	line* root;

	count_type get_size(line* l);
	two_lines split(line *l, count_type k);

	line* join(line *a, line *b);
	line* join(two_lines two) { return join(two.first, two.second); }
	line* find(line* l, count_type k);

public:
	Treap() { srand(120); root = nullptr; }

	line* find(count_type k);
	string get(count_type k) { return find(k)->text; }
	void clear();
	void insert(count_type k, string s);
	void append(string s) { insert(size(), s); }
	void remove(count_type k);
	void pop() { remove(size()); }
	count_type size() { return get_size(root); }

	// Treap access functions
	string get_line(count_type r, bool substitute_tab = 1);
	count_type get_tab_offset(position p);
	void set(position p, char ch);
	void insert(position p, string t);
	void remove(position p, count_type len = 1);
	void split_line(position p);
};

//// Selection
class Selection {
	Treap *file;
	Treap content; // selection
	template <typename F, typename G>
	void apply_on_selection(position p, F func, G func2);
public:
	Selection() {}
	Selection(Treap *_file) { file = _file; }
	position pos; // selection initial position
	void remove_selection(position p);
	void copy_selection(position p);
	void paste_selection(position p);
};


//// 	Editor
#define ESC 27
#define ENTER 10
#define BS 127
#define adds(s) addstr(s.c_str())
enum mode_type { INSERT, NORMAL, SELECT };

class Editor{
	// Editor state
	mode_type mode;
	position cur;
	count_type file_offset;

	// File
	string filename;
	Treap file;

	// Selection
	string last_find, last_replace;
	Selection selection;

	void save();

	// Printing
	void clear_line(count_type r);
	void print_line(count_type r);

	// User input
	void print_input(string text);
	count_type get_number(string prompt);
	string get_string(string prompt);

	// Movement
	void jump_line_end();
	void move(position p) { ::move(p.r, p.c); }
	void move_cursor(char ch);
	void jump(count_type r);
	void jump(position p) { jump(p.r); cur.c = p.c; }
	
	// Find and replace
	std::pair<bool, position> find(string text);
	void replace(position p, count_type length, string text) { file.remove(p, length); file.insert(p, text); }

public:
	Editor(string _filename, Treap &_file) {
		mode = NORMAL;
		cur = {0, 0};
		file_offset = 0;

		filename = _filename;
		file = _file;

		selection = Selection(&file);
	}
	void print_file(count_type start = 0);

	// The big function
	bool take_action();
};