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

#ifndef BBOT_MANIFEST
#define BBOT_MANIFEST

#include <string>
#include <vector>
#include <ostream>

#include <butl/optional>
#include <butl/target-triplet>
#include <butl/manifest-forward>

#include <bpkg/manifest> // version, repository_location

#include <bbot/export>

#include <bbot/variable>

namespace bbot
{
  enum class machine_type {kvm, nspawn};

  class LIBBBOT_EXPORT machine_manifest
  {
  public:
    // A "machine header".
    //
    std::string id;
    std::string name;
    std::string summary;

    butl::optional<machine_type> type;

    machine_manifest (std::string i, std::string n, std::string s)
        : id (std::move (i)), name (std::move (n)), summary (std::move (s)) {}

  public:
    machine_manifest () = default; // VC export.
    machine_manifest (butl::manifest_parser&, bool ignore_unknown = false);
    machine_manifest (butl::manifest_parser&,
                      butl::manifest_name_value start,
                      bool header_only = false,
                      bool ignore_unknown = false);

    void
    serialize (butl::manifest_serializer&) const;
  };

  using machine_manifests = std::vector<machine_manifest>;

  class LIBBBOT_EXPORT task_request_manifest
  {
  public:
    std::string agent;

    // Agent's public key SHA256 fingerprint.
    //
    // @@ How the fingerpring for openssl public key will be produced? Seems
    //    there is no "standard" for it. Possibly we will use the following
    //    command result (plain SHA256).
    //
    //    $ cat key.pub | openssl sha256
    //
    std::string fingerprint;

    machine_manifests machines; // Only machine headers.

  public:
    task_request_manifest () = default; // VC export.
    task_request_manifest (butl::manifest_parser&,
                           bool ignore_unknown = false);

    void
    serialize (butl::manifest_serializer&) const;
  };

  class LIBBBOT_EXPORT task_manifest
  {
  public:
    // Package to build.
    //
    std::string name;
    bpkg::version version;
    bpkg::repository_location repository; // Remote or absolute.

    // Build machine to use for building the package.
    //
    std::string machine;

    // Default for the machine if absent.
    //
    butl::optional<butl::target_triplet> target;

    // Build system configuration variables (in addition to build environment
    // configuration variables).
    //
    variables config;

  public:
    task_manifest () = default; // VC export.
    task_manifest (butl::manifest_parser&, bool ignore_unknown = false);
    task_manifest (butl::manifest_parser&,
                   butl::manifest_name_value start,
                   bool ignore_unknown = false);

    void
    serialize (butl::manifest_serializer&) const;
  };

  class LIBBBOT_EXPORT task_response_manifest
  {
  public:
    // If empty then no task available.
    //
    std::string session;

    // Challenge and task are absent if session is empty.
    //
    butl::optional<std::string> challenge;
    butl::optional<task_manifest> task;

  public:
    task_response_manifest () = default; // VC export.
    task_response_manifest (butl::manifest_parser&,
                            bool ignore_unknown = false);

    void
    serialize (butl::manifest_serializer&) const;
  };

  // Build task or operation result status.
  //
  enum class result_status: std::uint8_t
  {
    // The order of the enumerators is arranged so that their integral values
    // indicate whether one "overrides" the other in the "merge" operator|
    // (see below).
    //
    success,
    warning,
    error,
    abort,
    abnormal
  };

  LIBBBOT_EXPORT std::string
  to_string (result_status);

  LIBBBOT_EXPORT result_status
  to_result_status (const std::string&); // May throw invalid_argument.

  inline std::ostream&
  operator<< (std::ostream& os, result_status s) {return os << to_string (s);}

  inline result_status&
  operator |= (result_status& l, result_status r)
  {
    if (static_cast<std::uint8_t> (r) > static_cast<std::uint8_t> (l))
      l = r;
    return l;
  }

  struct operation_result
  {
    std::string operation; // "configure", "update", "test", etc.
    result_status status;
    std::string log;
  };

  using operation_results = std::vector<operation_result>;

  class LIBBBOT_EXPORT result_manifest
  {
  public:
    // Built package.
    //
    std::string name;
    bpkg::version version;

    result_status status;

    // Ordered (ascending) by operation value. May not contain all the
    // operations if the task failed in the middle, but should have no gaps
    // (operation can not start unless all previous ones succeeded).
    //
    operation_results results;

    result_manifest () = default; // VC export.
    result_manifest (butl::manifest_parser&, bool ignore_unknown = false);
    result_manifest (butl::manifest_parser&,
                     butl::manifest_name_value start,
                     bool ignore_unknown = false);

    void
    serialize (butl::manifest_serializer&) const;
  };

  class LIBBBOT_EXPORT result_request_manifest
  {
  public:
    std::string session;   // The task response session.
    std::string challenge; // The answer to challenge in the task response.

    result_manifest result;

  public:
    result_request_manifest () = default; // VC export.
    result_request_manifest (butl::manifest_parser&,
                             bool ignore_unknown = false);

    void
    serialize (butl::manifest_serializer&) const;
  };
}

#endif // BBOT_MANIFEST