#pragma once

#include <stdint.h>

#include <array>
#include <memory>

#include "../Channel.hh"
#include "../CommandFormats.hh"
#include "../Text.hh"
#include "AssistServer.hh"
#include "CardSpecial.hh"
#include "MapState.hh"
#include "PlayerState.hh"
#include "RulerServer.hh"
#include "Tournament.hh"

struct Lobby;

namespace Episode3 {

/**
 * This implementation of Episode 3 battles is derived from Sega's original
 * server implementation, reverse-engineered from the Episode 3 client
 * executable. The control flow, function breakdown, and structure definitions
 * in these files map very closely to how their server implementation was
 * written; notable differences (due to necessary environment differences or bug
 * fixes) are described in the comments therein.
 *
 * The following files are direct reverse-engineerings of Sega's original code,
 * except where noted in the comments:
 *   AssistServer.hh/cc
 *   Card.hh/cc
 *   CardSpecial.hh/cc
 *   DeckState.hh/cc
 *   MapState.hh/cc
 *   PlayerState.hh/cc
 *   PlayerStateSubordinates.hh/cc
 *   RulerServer.hh/cc
 *   Server.hh/cc
 *
 * There are likely undiscovered bugs in this code, some originally written by
 * Sega, but more written by me as I manually transcribed and updated this code.
 *
 * Class ownership levels (classes may only contain weak_ptrs, not shared_ptrs,
 * to classes at the same or higher level):
 * - Server
 * - - RulerServer
 * - - - AssistServer
 * - - - CardSpecial
 * - - - - StateFlags
 * - - - - DeckEntry
 * - - - - PlayerState
 * - - - - - Card
 * - - - - - - CardShortStatus
 * - - - - - - DeckState
 * - - - - - - HandAndEquipState
 * - - - - - - MapAndRulesState / OverlayState
 * - - - - - - - Everything within DataIndexes
 */

class Server : public std::enable_shared_from_this<Server> {
  // In the original code, there is a TCardServerBase class and a TCardServer
  // class, with the former containing some basic parts of the game state and
  // a pointer to the latter. It seems these two classes exist (instead of one
  // big class) so that the force reset command could be implemented; however,
  // it appears that that command is never sent by the client, so we combine
  // the two classes into one in our implementation.
public:
  struct Options {
    std::shared_ptr<const CardIndex> card_index;
    std::shared_ptr<const MapIndex> map_index;
    uint32_t behavior_flags;
    std::shared_ptr<PSOLFGEncryption> random_crypt;
    std::shared_ptr<const Tournament> tournament;
    std::array<std::vector<uint16_t>, 5> trap_card_ids;

    inline bool is_trial() const {
      return (this->behavior_flags & BehaviorFlag::IS_TRIAL_EDITION);
    }
  };
  Server(std::shared_ptr<Lobby> lobby, Options&& options);
  ~Server() noexcept(false);
  void init();

  class StackLogger : public PrefixedLogger {
  public:
    StackLogger(const Server* s, const std::string& prefix);
    StackLogger(const Server* s, const std::string& prefix, LogLevel min_level);
    StackLogger(const StackLogger&) = delete;
    StackLogger(StackLogger&&);
    StackLogger& operator=(const StackLogger&) = delete;
    StackLogger& operator=(StackLogger&&);
    ~StackLogger() noexcept(false);

  private:
    const Server* server;
  };
  StackLogger log_stack(const std::string& prefix) const;
  const StackLogger& log() const;

  int8_t get_winner_team_id() const;

  template <typename T>
  void send(const T& cmd, uint8_t command = 0xC9, bool enable_masking = true) const {
    if (cmd.header.size != sizeof(cmd) / 4) {
      throw std::logic_error("outbound command size field is incorrect");
    }
    if (!this->options.is_trial() && (cmd.header.subsubcommand == 0x06)) {
      this->num_6xB4x06_commands_sent++;
      this->prev_num_6xB4x06_commands_sent = this->num_6xB4x06_commands_sent;
      if (this->num_6xB4x06_commands_sent > 0x100) {
        return;
      }
    }
    this->send(&cmd, cmd.header.size * 4, command, enable_masking);
  }
  void send(const void* data, size_t size, uint8_t command = 0xC9, bool enable_masking = true) const;
  void send_commands_for_joining_spectator(Channel& ch) const;

  void force_battle_result(uint8_t surrendered_client_id, bool set_winner);
  void force_replace_assist_card(uint8_t client_id, uint16_t card_id);
  void force_destroy_field_character(uint8_t client_id, size_t set_index);

  __attribute__((format(printf, 2, 3))) void send_debug_message_printf(const char* fmt, ...) const;
  __attribute__((format(printf, 2, 3))) void send_info_message_printf(const char* fmt, ...) const;
  void send_debug_command_received_message(
      uint8_t client_id, uint8_t subsubcommand, const char* description) const;
  void send_debug_command_received_message(
      uint8_t subsubcommand, const char* description) const;
  void send_debug_message_if_error_code_nonzero(
      uint8_t client_id, int32_t error_code) const;

  void send_6xB4x46() const;

  void add_team_exp(uint8_t team_id, int32_t exp);
  bool advance_battle_phase();
  void action_phase_after();
  void draw_phase_before();
  std::shared_ptr<const CardIndex::CardEntry> definition_for_card_ref(uint16_t card_ref) const;
  std::shared_ptr<Card> card_for_set_card_ref(uint16_t card_ref);
  std::shared_ptr<const Card> card_for_set_card_ref(uint16_t card_ref) const;
  uint16_t card_id_for_card_ref(uint16_t card_ref) const;
  bool card_ref_is_empty_or_has_valid_card_id(uint16_t card_ref) const;
  bool check_for_battle_end();
  void check_for_destroyed_cards_and_send_6xB4x05_6xB4x02();
  bool check_presence_entry(uint8_t client_id) const;
  void clear_player_flags_after_dice_phase();
  void compute_all_map_occupied_bits();
  void compute_team_dice_bonus(uint8_t team_id);
  void copy_player_states_to_prev_states();
  std::shared_ptr<const CardIndex::CardEntry> definition_for_card_id(uint16_t card_id) const;
  void destroy_cards_with_zero_hp();
  void determine_first_team_turn();
  void dice_phase_after();
  void set_phase_before();
  void draw_phase_after();
  void dice_phase_before();
  void end_attack_list_for_client(uint8_t client_id);
  void end_action_phase();
  bool enqueue_attack_or_defense(uint8_t client_id, ActionState* pa);
  BattlePhase get_battle_phase() const;
  ActionSubphase get_current_action_subphase() const;
  uint8_t get_current_team_turn() const;
  std::shared_ptr<PlayerState> get_player_state(uint8_t client_id);
  std::shared_ptr<const PlayerState> get_player_state(uint8_t client_id) const;
  uint32_t get_random(uint32_t max);
  float get_random_float_0_1();
  uint32_t get_round_num() const;
  SetupPhase get_setup_phase() const;
  uint32_t get_should_copy_prev_states_to_current_states() const;
  bool is_registration_complete() const;
  void move_phase_after();
  void action_phase_before();
  void send_6xB4x1C_names_update();
  int8_t send_6xB4x33_remove_ally_atk_if_needed(const ActionState& pa);
  void send_all_state_updates();
  void send_set_card_updates_and_6xB4x04_if_needed();
  void set_battle_ended();
  void set_battle_started();
  void set_client_id_ready_to_advance_phase(uint8_t client_id);
  void set_phase_after();
  void move_phase_before();
  void set_player_deck_valid(uint8_t client_id);
  void setup_and_start_battle();
  G_SetStateFlags_Ep3_6xB4x03 prepare_6xB4x03() const;
  void update_battle_state_flags_and_send_6xB4x03_if_needed(bool always_send = false);
  bool update_registration_phase();
  void on_server_data_input(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx0B_mulligan_hand(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx0C_end_mulligan_phase(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx0D_end_non_action_phase(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx0E_discard_card_from_hand(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx0F_set_card_from_hand(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx10_move_fc_to_location(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx11_enqueue_attack_or_defense(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx12_end_attack_list(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx13_update_map_during_setup(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx14_update_deck_during_setup(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx15_unused_hard_reset_server_state(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx1B_update_player_name(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx1D_start_battle(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx21_end_battle(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx28_end_defense_list(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx2B_legacy_set_card(std::shared_ptr<Client> sender_c, const std::string&);
  void handle_CAx34_subtract_ally_atk_points(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx37_client_ready_to_advance_from_starter_roll_phase(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx3A_time_limit_expired(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx40_map_list_request(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx41_map_request(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx48_end_turn(std::shared_ptr<Client> sender_c, const std::string& data);
  void handle_CAx49_card_counts(std::shared_ptr<Client> sender_c, const std::string& data);
  void compute_losing_team_id_and_add_winner_flags(uint32_t flags);
  uint32_t get_team_exp(uint8_t team_id) const;
  uint32_t send_6xB4x06_if_card_ref_invalid(uint16_t card_ref, int16_t negative_value);
  void unknown_8023EEF4();
  void execute_bomb_assist_effect();
  void replace_targets_due_to_destruction_or_conditions(ActionState* as);
  bool any_target_exists_for_attack(const ActionState& as);
  uint8_t get_current_team_turn2() const;
  void unknown_8023EE48();
  void unknown_8023EE80();
  void unknown_802402F4();
  void send_6xB4x39() const;
  void send_6xB4x05(); // Recomputes the map occupied bits, so can't be const
  void send_6xB4x02_for_all_players_if_needed(bool always_send = false);
  void send_6xB4x50_trap_tile_locations() const;

  G_UpdateDecks_Ep3_6xB4x07 prepare_6xB4x07_decks_update() const;
  G_SetPlayerNames_Ep3_6xB4x1C prepare_6xB4x1C_names_update() const;
  static std::string prepare_6xB6x41_map_definition(std::shared_ptr<const MapIndex::Map> map, uint8_t language, bool is_trial);
  void send_6xB6x41_to_all_clients() const;
  G_SetTrapTileLocations_Ep3_6xB4x50 prepare_6xB4x50_trap_tile_locations() const;

  std::vector<std::shared_ptr<Card>> const_cast_set_cards_v(
      const std::vector<std::shared_ptr<const Card>>& cards);

private:
  typedef void (Server::*handler_t)(std::shared_ptr<Client>, const std::string&);
  static const std::unordered_map<uint8_t, handler_t> subcommand_handlers;

public:
  // These fields are not part of the original implementation
  std::weak_ptr<Lobby> lobby;
  bool has_lobby;
  Options options;
  std::shared_ptr<const MapIndex::Map> last_chosen_map;
  bool tournament_match_result_sent;
  uint8_t override_environment_number;
  mutable std::deque<StackLogger*> logger_stack;

  // These fields were originally contained in the TCardServerBase object
  struct PresenceEntry {
    uint8_t player_present;
    uint8_t deck_valid;
    uint8_t is_cpu_player;
    PresenceEntry();
    void clear();
  } __attribute__((packed));
  std::shared_ptr<MapAndRulesState> map_and_rules;
  std::shared_ptr<DeckEntry> deck_entries[4];
  parray<PresenceEntry, 4> presence_entries;
  uint8_t num_clients_present;
  parray<NameEntry, 4> name_entries;
  parray<uint8_t, 4> name_entries_valid;
  OverlayState overlay_state;
  parray<parray<uint8_t, 0x2F0>, 4> client_card_counts;

  // These fields were originally contained in the TCardServer object
  uint32_t battle_finished;
  uint32_t battle_in_progress;
  uint32_t round_num;
  BattlePhase battle_phase;
  uint8_t first_team_turn;
  uint8_t current_team_turn1;
  SetupPhase setup_phase;
  RegistrationPhase registration_phase;
  ActionSubphase action_subphase;
  uint8_t current_team_turn2;
  ActionState pending_attacks[0x20];
  uint32_t num_pending_attacks;
  parray<uint8_t, 4> client_done_enqueuing_attacks;
  parray<uint8_t, 4> player_ready_to_end_phase;
  uint32_t unknown_a10;
  uint32_t overall_time_expired;
  // Note: In the original implementation, this is a uint32_t and is measured in
  // seconds. In our environment, the simplest implementation uses now(), which
  // returns microseconds, so we use a uint64_t instead.
  uint64_t battle_start_usecs;
  uint32_t should_copy_prev_states_to_current_states;
  std::shared_ptr<CardSpecial> card_special;
  std::shared_ptr<StateFlags> state_flags;
  std::array<std::shared_ptr<PlayerState>, 4> player_states;
  parray<uint32_t, 4> clients_done_in_mulligan_phase;
  uint32_t num_pending_attacks_with_cards;
  std::shared_ptr<Card> attack_cards[0x20];
  ActionState pending_attacks_with_cards[0x20];
  uint32_t unknown_a14;
  uint32_t unknown_a15;
  parray<uint32_t, 4> defense_list_ended_for_client;
  std::shared_ptr<AssistServer> assist_server;
  uint16_t next_assist_card_set_number;
  std::shared_ptr<RulerServer> ruler_server;
  parray<parray<parray<uint8_t, 2>, 2>, 5> warp_positions; // Array indexes are (type, end, x/y)
  parray<int16_t, 2> team_exp;
  parray<int16_t, 2> team_dice_bonus;
  parray<uint32_t, 2> team_client_count;
  parray<uint32_t, 2> team_num_ally_fcs_destroyed;
  parray<uint32_t, 2> team_num_cards_destroyed;
  parray<uint8_t, 5> num_trap_tiles_of_type;
  parray<uint8_t, 5> chosen_trap_tile_index_of_type;
  parray<parray<parray<uint8_t, 2>, 8>, 5> trap_tile_locs;
  ActionState pb_action_states[4];
  parray<uint8_t, 4> has_done_pb;
  parray<parray<uint8_t, 4>, 4> has_done_pb_with_client;
  mutable uint32_t num_6xB4x06_commands_sent;
  mutable uint32_t prev_num_6xB4x06_commands_sent;
};

} // namespace Episode3