#include <unistd.h>
#include <ncurses.h>

#include "Editor.h"
#include "Command.h"
#include "TerminalFrontend.h"


bool
TerminalFrontend::Init(Editor &ed)
{
    initscr();
    cbreak();
    noecho();
    keypad(stdscr, TRUE);
    // Enable 8-bit meta key sequences (Alt/ESC-prefix handling in terminals)
    meta(stdscr, TRUE);
    // Make ESC key sequences resolve quickly so ESC+<key> works as meta
#ifdef set_escdelay
    set_escdelay(50);
#endif
    nodelay(stdscr, TRUE);
    curs_set(1);
    // Enable mouse support if available
    mouseinterval(0);
    mousemask(ALL_MOUSE_EVENTS, nullptr);

	int r = 0, c = 0;
	getmaxyx(stdscr, r, c);
	prev_r_ = r;
	prev_c_ = c;
	ed.SetDimensions(static_cast<std::size_t>(r), static_cast<std::size_t>(c));
	return true;
}


void
TerminalFrontend::Step(Editor &ed, bool &running)
{
	// Handle resize and keep editor dimensions synced
	int r, c;
	getmaxyx(stdscr, r, c);
	if (r != prev_r_ || c != prev_c_) {
		resizeterm(r, c);
		clear();
		prev_r_ = r;
		prev_c_ = c;
	}
	ed.SetDimensions(static_cast<std::size_t>(r), static_cast<std::size_t>(c));

	MappedInput mi;
	if (input_.Poll(mi)) {
		if (mi.hasCommand) {
			Execute(ed, mi.id, mi.arg, mi.count);
			if (mi.id == CommandId::Quit || mi.id == CommandId::SaveAndQuit) {
				running = false;
			}
		}
	} else {
		// Avoid busy loop
		usleep(1000);
	}

	renderer_.Draw(ed);
}


void
TerminalFrontend::Shutdown()
{
	endwin();
}