implement downloading games and parsing deck

download.h

@@ -0,0 +1,76 @@
+#ifndef DYNAMIC_PROGRAM_DOWNLOAD_H
+#define DYNAMIC_PROGRAM_DOWNLOAD_H
+
+#include <boost/json.hpp>
+#include <boost/json/src.hpp>
+#include <cpr/cpr.h>
+#include <iostream>
+
+#include "game_state.h"
+
+
+// This helper function deduces the type and assigns the value with the matching key
+template<class T>
+void extract( boost::json::object const& obj, T& t, std::string_view key )
+{
+  t = value_to<T>( obj.at( key ) );
+}
+
+namespace Hanabi {
+  Card tag_invoke(boost::json::value_to_tag<Card>,
+                          boost::json::value const &jv) {
+    Hanabi::Card card{};
+    boost::json::object const &obj = jv.as_object();
+    extract(obj, card.rank, "rank");
+    extract(obj, card.suit, "suitIndex");
+    card.rank = 5 - card.rank;
+    return card;
+  }
+
+  void tag_invoke(boost::json::value_from_tag, boost::json::value &jv, Hanabi::Card const &card) {
+    jv = {{"suitIndex", card.suit}, {"rank", card.rank}};
+  }
+}
+
+
+std::vector<Hanabi::Card> parse_deck(const boost::json::value& deck_json) {
+    auto deck = boost::json::value_to<std::vector<Hanabi::Card>>(deck_json);
+    std::array<std::array<Hanabi::rank_t, 5>, 6> next_copy_indices {};
+    for(size_t i = 0; i < deck.size(); i++) {
+      auto &card = deck[i];
+      assert(card.rank < 5);
+      assert(card.rank >= 0);
+      assert(card.suit < 6);
+      assert(card.suit >= 0);
+      card.index = i;
+      card.copy = next_copy_indices[card.suit][card.rank];
+      next_copy_indices[card.suit][card.rank]++;
+    }
+    return deck;
+}
+
+boost::json::object download_game_json(int game_id) {
+  std::string request_str = "https://hanab.live/export/" + std::to_string(game_id);
+  cpr::Response r = cpr::Get(cpr::Url(request_str));
+  if (r.header["content-type"] != "application/json; charset=utf-8") {
+    return {};
+  }
+  return boost::json::parse(r.text).as_object();
+}
+
+void download_game(int game_id) {
+  boost::json::object game = download_game_json(game_id);
+  std::cout << game << std::endl;
+  const auto deck = parse_deck(game.at("deck"));
+  const unsigned num_players = game.at("players").as_array().size();
+
+  for(const auto& card : deck) {
+    std::cout << card << std::endl;
+  }
+  std::cout << num_players;
+}
+
+
+
+
+#endif // DYNAMIC_PROGRAM_DOWNLOAD_H

game_state.h

@@ -17,6 +17,8 @@
 #include <ostream>
 
 
+namespace Hanabi {
+
 using rank_t = std::uint8_t;
 using suit_t = std::uint8_t;
 using clue_t = std::uint8_t;
@@ -24,7 +26,6 @@ using player_t = std::int8_t;
 
 using state_t = std::uint32_t;
 
-
 /**
  * We will generally assume that stacks are played from n to 0
  * Playing a 0 will yield a clue
@@ -46,6 +47,7 @@ struct Card {
   suit_t suit;
   rank_t rank;
   uint8_t copy;
+  uint8_t index; // index of card in the deck
 
   Card &operator++();
   Card successor() const;
@@ -78,8 +80,7 @@ constexpr Card y4 = {1, 4, 0};
  * - Number of clues
  */
 
-template<std::size_t num_suits>
-using Stacks = std::array<rank_t, num_suits>;
+template <std::size_t num_suits> using Stacks = std::array<rank_t, num_suits>;
 
 template <std::size_t num_suits>
 std::ostream &operator<<(std::ostream &os, const Stacks<num_suits> &stacks);
@@ -91,8 +92,7 @@ struct CardMultiplicity {
   auto operator<=>(const CardMultiplicity &) const = default;
 };
 
-template<std::size_t num_suits>
-struct CardPositions {
+template <std::size_t num_suits> struct CardPositions {
 
   const player_t &operator[](const Card &card) const;
 
@@ -101,14 +101,13 @@ struct CardPositions {
   auto operator<=>(const CardPositions &) const = default;
 
 private:
-  std::array<std::array<std::array<player_t, max_card_duplicity>, starting_card_rank>, num_suits> _card_positions;
+  std::array<
+      std::array<std::array<player_t, max_card_duplicity>, starting_card_rank>,
+      num_suits>
+      _card_positions;
 };
 
-enum class ActionType {
-  discard,
-  clue,
-  play
-};
+enum class ActionType { discard, clue, play };
 
 struct Action {
   ActionType type{};
@@ -116,11 +115,10 @@ struct Action {
   std::uint8_t index{};
 };
 
-
-template <std::size_t num_suits, std::size_t num_players, std::size_t hand_size, std::uint8_t max_draw_pile_size>
+template <std::size_t num_suits, std::size_t num_players, std::size_t hand_size,
+          std::uint8_t max_draw_pile_size>
 class HanabiState {
 public:
-
   Action clue();
   /**
    * Plays a card from current hand, drawing top card of draw pile and rotating draw pile
@@ -132,7 +130,6 @@ public:
 
   void revert(const Action &action);
 
-
   void draw(std::uint8_t index);
   void revert_draw(std::uint8_t index, Card card);
   void incr_turn();
@@ -142,7 +139,8 @@ public:
   clue_t _num_clues{};
   std::uint8_t _draw_pile_size{};
   Stacks<num_suits> _stacks{};
-  std::array<boost::container::static_vector<Card, hand_size>, num_players> _hands {};
+  std::array<boost::container::static_vector<Card, hand_size>, num_players>
+      _hands{};
   CardPositions<num_suits> _card_positions{};
   std::list<CardMultiplicity> _draw_pile{};
 
@@ -152,11 +150,17 @@ public:
   auto operator<=>(const HanabiState &) const = default;
 };
 
-template <std::size_t num_suits, std::size_t num_players, std::size_t hand_size, std::uint8_t max_draw_pile_size>
-std::ostream& operator<<(std::ostream& os, HanabiState<num_suits, num_players, hand_size, max_draw_pile_size> hanabi_state);
+template <std::size_t num_suits, std::size_t num_players, std::size_t hand_size,
+          std::uint8_t max_draw_pile_size>
+std::ostream &
+operator<<(std::ostream &os,
+           HanabiState<num_suits, num_players, hand_size, max_draw_pile_size>
+               hanabi_state);
 
 #include "game_state.hpp"
 
 template class HanabiState<5, 3, 4, 20>;
 
+}
+
 #endif // DYNAMIC_PROGRAM_GAME_STATE_H

main.cpp

@@ -9,7 +9,9 @@
 #include <vector>
 
 #include "game_state.h"
+#include "download.h"
 
+namespace Hanabi {
 
 void test_game() {
   HanabiState<2, 2, 5, 10> state;
@@ -36,20 +38,24 @@ void test_game() {
   assert(state == state2);
 }
 
-void print_sizes() {
-  std::cout << "size of card -> hand map: " << sizeof(HanabiState<5,3,4, 5>) << std::endl;
+void download() { download_game(1000000); }
 
-  CardSetSpecification<5> test;
-  std::cout << sizeof(CardSetSpecification<8>::AdditionalCardsFlags) << std::endl;
+void print_sizes() {
+  std::cout << "size of card -> hand map: " << sizeof(HanabiState<5, 3, 4, 5>)
+            << std::endl;
 
   unsigned exp = 32;
-  std::cout << "Pair size: " << sizeof(std::pair<std::uint32_t, float>) << std::endl;
+  std::cout << "Pair size: " << sizeof(std::pair<std::uint32_t, float>)
+            << std::endl;
   std::cout << sizeof(boost::rational<int>) << std::endl;
   std::cout << (1ul << exp) << std::endl;
 }
 
+}
+
 int main() {
-  test_game();
+//  Hanabi::test_game();
+  Hanabi::download();
 
   return 0;
 }