#include "Menu.h"
#include "Toolbox.hpp"
#include <cstring>

Menu::Menu() : menuOptions() {}

unsigned indexOfCommandEnd(char* str) {
	unsigned ind = 0;
	std::cout << str[ind] << std::endl;
	
	return ind;
}

void Menu::addCommand(const Command& command) {
	menuOptions.add(command);
}

/*!
 * Prints the title, then an Error/Warning/Sucess message (if set),
 * prints all command names as an ordered list (starting from 1),
 * waits for user input to select one of those commands (by list number)
 * and finally executes the appropriate command's run() function.
 *
 * After the run() function exists, everything is reprinted.
 * The 0 list index is always "Go Back"/"Exit" and it always stops the reprinting loop.
 *
 * If there are no commands, prints "Menu is empty!".
 * If user input doesn't correspond to any command, registers an error message and reprints.
 */
void Menu::navigate() const {
	if (menuOptions.get_count() == 0) {
		printLine("Menu is empty!");
		return;
	}

	char buffer[MAX_LINE_WIDTH];

	unsigned startIndex, commandEnd, paramsStart, index;
	bool hasThrown = false;
	while (!hasThrown) {
		startIndex = 0;
		inputLineBox(buffer, MAX_LINE_WIDTH, false);

		while (buffer[startIndex] == ' ') startIndex++;

		commandEnd = startIndex;
		while (buffer[commandEnd] != ' ' && buffer[commandEnd] != '\n' && buffer[commandEnd] != '\0')
			commandEnd++;

		index = menuOptions.get_count();
		for (unsigned i = 0; i < menuOptions.get_count() && index == menuOptions.get_count(); i++) {
			if (strncmp(buffer + startIndex, menuOptions[i].get_name(), commandEnd - startIndex) == 0)
				index = i;
		}

		paramsStart = startIndex + commandEnd;
		while (buffer[paramsStart] == ' ') paramsStart++;

		if (index == menuOptions.get_count()) {
			printLine("Invalid menu option!");
			continue;
		}

		try {
			menuOptions[index].run(buffer + paramsStart);
		}
		catch (std::logic_error err) {
			hasThrown = true;
			printLine(err.what());
		}
	}
}