// file      : bpkg/package -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#ifndef BPKG_PACKAGE
#define BPKG_PACKAGE

#include <set>
#include <vector>
#include <cstdint> // uint16
#include <ostream>

#include <odb/core.hxx>

#include <bpkg/types>
#include <bpkg/utility>

#pragma db model version(1, 1, open)

namespace bpkg
{
  // Use an image type to map version to the database since there
  // is no way to modify individual components directly.
  //
  #pragma db value
  struct _version
  {
    std::uint16_t epoch;
    string upstream;
    std::uint16_t revision;
    string canonical_upstream;
  };
}

#include <bpkg/manifest>

namespace bpkg
{
  // compare_lazy_ptr
  //
  // Compare two lazy pointers via the pointed-to object ids.
  //
  struct compare_lazy_ptr
  {
    template <typename P>
    bool
    operator() (const P& x, const P& y) const
    {
      return x.object_id () < y.object_id ();
    }
  };

  // path
  //
  using optional_string = optional<string>;
  using optional_path = optional<path>;
  using optional_dir_path = optional<dir_path>;

  #pragma db map type(path) as(string)  \
    to((?).string ()) from(bpkg::path (?))

  #pragma db map type(optional_path) as(bpkg::optional_string) \
    to((?) ? (?)->string () : bpkg::optional_string ())        \
    from((?) ? bpkg::path (*(?)) : bpkg::optional_path ())

  #pragma db map type(dir_path) as(string)  \
    to((?).string ()) from(bpkg::dir_path (?))

  #pragma db map type(optional_dir_path) as(bpkg::optional_string) \
    to((?) ? (?)->string () : bpkg::optional_string ())            \
    from((?) ? bpkg::dir_path (*(?)) : bpkg::optional_dir_path ())

  // version
  //
  #pragma db map type(version) as(_version)                                \
    to(bpkg::_version{(?).epoch (),                                        \
                      (?).upstream (),                                     \
                      (?).revision (),                                     \
                      (?).canonical_upstream ()})                          \
    from(bpkg::version ((?).epoch, std::move ((?).upstream), (?).revision))

  // repository
  //
  #pragma db object pointer(std::shared_ptr) session
  class repository
  {
  public:
    // We use a weak pointer for prerequisite repositories because we
    // might have cycles.
    //
    using complements_type =
      std::set<lazy_shared_ptr<repository>, compare_lazy_ptr>;
    using prerequisites_type =
      std::set<lazy_weak_ptr<repository>, compare_lazy_ptr>;

    repository_location location;
    complements_type complements;
    prerequisites_type prerequisites;

    const string&
    name () const {return location.canonical_name ();}

    // Used to detect recursive fecthing. Will probably be replaced
    // by the 'repositories' file timestamp or hashsum later.
    //
    #pragma db transient
    bool fetched = false;

  public:
    explicit
    repository (repository_location l): location (move (l)) {}

    // Database mapping.
    //
    #pragma db value
    struct _id_type
    {
      string name; // Canonical name.
      string location;
    };

    _id_type
    _id () const;

    void
    _id (_id_type&&);

    #pragma db member(location) transient

    #pragma db member(id) virtual(_id_type) before id(name) \
      get(_id) set(_id (std::move (?))) column("")

    #pragma db member(complements) id_column("repository") \
      value_column("complement") value_not_null

    #pragma db member(prerequisites) id_column("repository") \
      value_column("prerequisite") value_not_null

  private:
    friend class odb::access;
    repository () = default;
  };

  #pragma db view object(repository) query(repository::id.name != "" && (?))
  struct repository_count
  {
    #pragma db column("count(" + repository::id.name + ")")
    size_t result;
  };

  // package_version_id
  //
  #pragma db value
  struct package_version_id
  {
    string        name;
    std::uint16_t epoch;
    string        upstream; // Canonical upstream.
    std::uint16_t revision;

    package_version_id () = default;
    package_version_id (string, const version&);

    #pragma db member(epoch)    column("version_epoch")
    #pragma db member(upstream) column("version_upstream")
    #pragma db member(revision) column("version_revision")
  };

  bool
  operator< (const package_version_id&, const package_version_id&);

  // package_location
  //
  #pragma db value
  struct package_location
  {
    using repository_type = bpkg::repository;

    lazy_shared_ptr<repository_type> repository;
    path location; // Relative to the repository.
  };

  // available_package
  //
  #pragma db object pointer(shared_ptr) session
  class available_package
  {
  public:
    using version_type = bpkg::version;

    string name;
    version_type version;

    // List of repositories to which this package version belongs (yes,
    // in our world, it can be in multiple, unrelated repositories).
    //
    std::vector<package_location> locations;

    // Database mapping.
    //

    // id
    //
    #pragma db value
    struct _id_type
    {
      package_version_id data;
      string version_original_upstream;

      #pragma db member(data) column("")
    };

    _id_type
    _id () const;

    void
    _id (_id_type&&);

    #pragma db member(name) transient
    #pragma db member(version) transient

    #pragma db member(id) virtual(_id_type) before id(data) \
      get(_id) set(_id (std::move (?))) column("")

    // repositories
    //
    #pragma db member(locations) id_column("") value_column("") \
      unordered value_not_null

  private:
    friend class odb::access;
    available_package () = default;
  };

  #pragma db view object(available_package)
  struct available_package_count
  {
    #pragma db column("count(" + available_package::id.data.name + ")")
    size_t result;
  };

  // state
  //
  enum class state
  {
    broken,
    fetched,
    unpacked,
    configured
  };

  string
  to_string (state);

  state
  from_string (const string&); // May throw invalid_argument.

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

  #pragma db map type(state) as(string) \
    to(to_string (?))                   \
    from(bpkg::from_string (?))

  // package
  //
  #pragma db object pointer(shared_ptr) session
  class package
  {
  public:
    using version_type = bpkg::version;
    using state_type = bpkg::state;

    string name;
    version_type version;
    state_type state;

    // Path to the archive of this package, if any. If not absolute,
    // then it is relative to the configuration directory. The purge
    // flag indicates whether the archive should be removed when the
    // packaged is purged. If the archive is not present, it should
    // be false.
    //
    optional<path> archive;
    bool purge_archive;

    // Path to the source directory of this package, if any. If not
    // absolute, then it is relative to the configuration directory.
    // The purge flag indicates whether the directory should be
    // removed when the packaged is purged. If the source directory
    // is not present, it should be false.
    //
    optional<dir_path> src_root;
    bool purge_src;

    // Path to the output directory of this package, if any. It is
    // always relative to the configuration directory and currently
    // is always <name>-<version>. It is only set once the package
    // is configured and its main purse is to keep track of what
    // needs to be cleaned by the user before a broken package can
    // be purged. Note that it could be the same as out_root.
    //
    optional<dir_path> out_root;

    // Database mapping.
    //
    #pragma db member(name) id

  private:
    friend class odb::access;
    package () = default;
  };
}

#include <bpkg/package.ixx>

#endif // BPKG_PACKAGE