// Uppgift: Skapa en html-tabell över alla exempelfiler.
// Nyckelord: ifstream, kommandoradsargument, std::string, std::vector, struct, typedef
#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

typedef struct
{
  string file;
  string task;
  string keywords;
} example;

// " " in the string to avoid matching those lines when the program is run
// Compiler will see it as two strings to concatenate.
const string TASK = "// Up" "pgift: ";
const string KEYW = "// Nyck" "elord: ";

// Convert UTF8 characters to ISO-8859-1
string iso(string const& s);

void add_example(vector<example>& v, string filename)
{
  ifstream in(filename);

  if ( ! in)
    return;

  example ex;
  string line;
  while (getline(in, line))
  {
    size_t task = line.find(TASK);
    size_t keywords = line.find(KEYW);
    
    if ( task != string::npos )
      ex.task = iso(line.substr(task + TASK.length()));
    
    if ( keywords != string::npos )
      ex.keywords = iso(line.substr(keywords + KEYW.length()));
  }
  if (ex.task != "" || ex.keywords != "")
  {
    ex.file = iso(filename);
    v.push_back(ex);
  }
}

int main(int argc, char* argv[])
{
  vector<example> table;
  
  for (int i = 1; i < argc; ++i)
  {
    add_example(table, argv[i]);
  }

  cout << "<table>" << endl;
  cout << "<tr>" << endl
       << "<th class=\"file\">" << "Exempelfil" << "</th>"
       << "<th class=\"task\">" << "Uppgift" << "</th>"
       << "<th class=\"keyw\">" << "Nyckelord" << "</th>" << endl
       << "</tr>" << endl;

  bool odd = true;
  for (auto& i : table)
  {
    cout << "<tr class=\"" << (odd?"odd":"even") << "\">" << endl
         << "<td class=\"file\"><a href=\"" << i.file << "\">" << i.file << "</a></td>"
         << "<td class=\"task\">" << i.task << "</td>"
         << "<td class=\"keyw\">" << i.keywords << "</td>" << endl
         << "</tr>" << endl;
    odd = !odd;
  }
  cout << "</table>" << endl;
  
  return 0;
}


string iso(string const& s)
{
  string iso;
  unsigned i = 0;
  while ( i < s.size() )
  {
    if ( (s.at(i) & 0xE0) == 0xC0 )
    {
      iso += char((s.at(i) << 6) | (s.at(i+1) & 0x3F));
      i += 2;
    }
    else
    {
      iso += s.at(i);
      i += 1;
    }
  }
  return iso;
}