// file      : bbot/machine-manifest.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license   : TBC; see accompanying LICENSE file

#include <bbot/machine-manifest>

#include <butl/manifest-parser>
#include <butl/manifest-serializer>

using namespace butl;

namespace bbot
{
  using parser = manifest_parser;
  using parsing = manifest_parsing;
  using serializer = manifest_serializer;
  using serialization = manifest_serialization;
  using name_value = manifest_name_value;

  // machine_type
  //
  string
  to_string (machine_type t)
  {
    switch (t)
    {
    case machine_type::kvm:    return "kvm";
    case machine_type::nspawn: return "nspawn";
    }

    assert (false);
    return string ();
  }

  machine_type
  to_machine_type (const string& t)
  {
         if (t == "kvm")    return machine_type::kvm;
    else if (t == "nspawn") return machine_type::nspawn;
    else throw invalid_argument ("invalid machine type '" + t + "'");
  }

  // machine_manifest
  //
  machine_manifest::
  machine_manifest (parser& p, bool iu)
      : machine_manifest (p, p.next (), iu)
  {
    // Make sure this is the end.
    //
    name_value nv (p.next ());
    if (!nv.empty ())
      throw parsing (p.name (), nv.name_line, nv.name_column,
                     "single machine manifest expected");
  }

  machine_manifest::
  machine_manifest (parser& p, name_value nv, bool iu)
  {
    auto bad_name = [&p, &nv] (const string& d)
    {
      throw parsing (p.name (), nv.name_line, nv.name_column, d);
    };

    auto bad_value = [&p, &nv] (const string& d)
    {
      throw parsing (p.name (), nv.value_line, nv.value_column, d);
    };

    // Make sure this is the start and we support the version.
    //
    if (!nv.name.empty ())
      bad_name ("start of machine manifest expected");

    if (nv.value != "1")
      bad_value ("unsupported format version");

    optional<machine_type> type;

    for (nv = p.next (); !nv.empty (); nv = p.next ())
    {
      string& n (nv.name);
      string& v (nv.value);

      if (n == "id")
      {
        if (!id.empty ())
          bad_name ("machine id redefinition");

        if (v.empty ())
          bad_value ("empty machine id");

        id = move (v);
      }
      else if (n == "name")
      {
        if (!name.empty ())
          bad_name ("machine name redefinition");

        if (v.empty ())
          bad_value ("empty machine name");

        name = move (v);
      }
      else if (n == "summary")
      {
        if (!summary.empty ())
          bad_name ("machine summary redefinition");

        if (v.empty ())
          bad_value ("empty machine summary");

        summary = move (v);
      }
      else if (n == "type")
      {
        if (type)
          bad_name ("machine type redefinition");

        try
        {
          type = to_machine_type (v);
        }
        catch (const invalid_argument&)
        {
          bad_value ("invalid machine type");
        }
      }
      else if (n == "mac")
      {
        if (mac)
          bad_name ("machine mac redefinition");

        mac = move (v);
      }
      else if (!iu)
        bad_name ("unknown name '" + n + "' in machine manifest");
    }

    // Verify all non-optional values were specified.
    //
    if (id.empty ())
      bad_value ("no machine id specified");

    if (name.empty ())
      bad_value ("no machine name specified");

    if (summary.empty ())
      bad_value ("no machine summary specified");

    if (!type)
      bad_value ("no machine type specified");

    this->type = *type;
  }

  void machine_manifest::
  serialize (serializer& s) const
  {
    // @@ Should we check that all non-optional values are specified and all
    //    values are valid?
    //
    s.next ("", "1"); // Start of manifest.
    s.next ("id", id);
    s.next ("name", name);
    s.next ("summary", summary);
    s.next ("type", to_string (type));

    if (mac)
      s.next ("mac", *mac);

    s.next ("", ""); // End of manifest.
  }

}