//
//  cli.cxx
//  tax-manager
//
//  Created by Sam Jaffe on 10/8/20.
//  Copyright © 2020 Sam Jaffe. All rights reserved.
//

#include "cli.h"

#include <iostream>

namespace {

cli::args_t tokenize(std::string const & search, std::string const & token,
                     bool ignore_empty = false) {
  cli::args_t rval;
  size_t i = 0;
  for (size_t n = search.find(token); n != std::string::npos;
       i = n + 1, n = search.find(token, i)) {
    if (i == n && ignore_empty) continue;
    rval.emplace_back(&search[i], n - i);
  }
  rval.emplace_back(&search[i], search.size() - i);
  return rval;
}

}

namespace cli {

cli::cli() : callbacks_(), eof_(false) {
  register_callback("quit", [this] { eof_ = true; });
}

void cli::run() const {
  std::string command;
  while (!eof_ && std::getline(std::cin, command).good()) {
    auto views = tokenize(command, " ");
    command = views.front();
    views.erase(views.begin());
    if (!callbacks_.count(command)) continue; // TODO: Error message
    callbacks_.at(command)(views);
  }
}

template <> std::string cli::from_string(std::string const & str) {
  return str;
}

template <> int cli::from_string(std::string const & str) {
  return std::stoi(str);
}

}