#include "subtitles_ser.h"

#include "common/goos/ParseHelpers.h"
#include "common/goos/Reader.h"
#include "common/util/FileUtil.h"
#include "common/util/json_util.h"

#include "third-party/fmt/core.h"

int64_t get_int(const goos::Object& obj) {
  if (obj.is_int()) {
    return obj.integer_obj.value;
  }
  throw std::runtime_error(obj.print() + " was supposed to be an integer, but isn't");
}

const goos::Object& car(const goos::Object& x) {
  if (!x.is_pair()) {
    throw std::runtime_error("car: invalid pair");
  }

  return x.as_pair()->car;
}

const goos::Object& cdr(const goos::Object& x) {
  if (!x.is_pair()) {
    throw std::runtime_error("cdr: invalid pair");
  }

  return x.as_pair()->cdr;
}

std::string get_string(const goos::Object& x) {
  if (x.is_string()) {
    return x.as_string()->data;
  }
  throw std::runtime_error(x.print() + " was supposed to be a string, but isn't");
}

/*!
 * Parse a game text file.
 * Information is added to the game text database.
 *
 * The file should begin with (language-id x y z...) with the given language IDs.
 * Each entry should be (id "line for 1st language" "line for 2nd language" ...)
 * This adds the text line to each of the specified languages.
 */
void parse_text(const goos::Object& data, GameTextDB& db) {
  const GameTextFontBank* font = nullptr;
  std::vector<std::shared_ptr<GameTextBank>> banks;
  std::string possible_group_name;

  for_each_in_list(data.as_pair()->cdr, [&](const goos::Object& obj) {
    if (obj.is_pair()) {
      auto& head = car(obj);
      if (head.is_symbol("language-id")) {
        if (banks.size() != 0) {
          throw std::runtime_error("Languages have been set multiple times.");
        }

        if (cdr(obj).is_empty_list()) {
          throw std::runtime_error("At least one language must be set.");
        }

        if (possible_group_name.empty()) {
          throw std::runtime_error("Text group must be set before languages.");
        }

        for_each_in_list(cdr(obj), [&](const goos::Object& obj) {
          auto lang = get_int(obj);
          if (!db.bank_exists(possible_group_name, lang)) {
            // database has no lang in this group yet
            banks.push_back(db.add_bank(possible_group_name, std::make_shared<GameTextBank>(lang)));
          } else {
            banks.push_back(db.bank_by_id(possible_group_name, lang));
          }
        });
      } else if (head.is_symbol("group-name")) {
        if (!possible_group_name.empty()) {
          throw std::runtime_error("group-name has been set multiple times.");
        }

        possible_group_name = get_string(car(cdr(obj)));

        if (possible_group_name.empty()) {
          throw std::runtime_error("invalid group-name.");
        }

        if (!cdr(cdr(obj)).is_empty_list()) {
          throw std::runtime_error("group-name has too many arguments");
        }
      } else if (head.is_symbol("credits")) {
        // parse a "credits" object. it's a list of lines where the ID automatically increments, and
        // empty lines are skipped
        if (banks.size() == 0) {
          throw std::runtime_error("At least one language must be set before defining entries.");
        }

        if (cdr(obj).is_empty_list() || cdr(cdr(obj)).is_empty_list() ||
            !car(cdr(obj)).is_symbol(":begin") || !car(cdr(cdr(obj))).is_int()) {
          throw std::runtime_error("Invalid credits begin param");
        }

        const auto& it = cdr(cdr(obj));
        int begin_id = car(it).as_int();
        int id = begin_id - 1;
        for_each_in_list(cdr(it), [&](const goos::Object& entry) {
          ++id;
          if (entry.is_string()) {
            if (entry.as_string()->data.empty()) {
              // empty string! just advance
              return;
            }

            auto line = font->convert_utf8_to_game(entry.as_string()->data);
            // add to all langs
            for (auto& bank : banks) {
              bank->set_line(id, line);
            }
          } else if (entry.is_pair()) {
            int b_i = 0;
            for_each_in_list(entry, [&](const goos::Object& entry) {
              if (entry.is_string()) {
                if (b_i >= int(banks.size())) {
                  throw std::runtime_error(fmt::format("Too many strings in text id #x{:x}", id));
                }

                auto line = font->convert_utf8_to_game(entry.as_string()->data);
                banks[b_i++]->set_line(id, line);
              } else {
                throw std::runtime_error(fmt::format("Non-string value in text id #x{:x}", id));
              }
            });
            if (b_i != int(banks.size())) {
              throw std::runtime_error(
                  fmt::format("Not enough strings specified in text id #x{:x}", id));
            }
          } else {
            throw std::runtime_error(fmt::format("Non-string value in text id #x{:x}", id));
          }
        });
      } else if (head.is_symbol("text-version")) {
        if (font) {
          throw std::runtime_error("text version is already set");
        }

        const auto& ver_name = car(cdr(obj));
        if (!ver_name.is_symbol()) {
          throw std::runtime_error("invalid text version entry");
        }

        font = get_font_bank(ver_name.as_symbol()->name);
      }

      else if (head.is_int()) {
        if (!font) {
          throw std::runtime_error("Text version must be set before defining entries.");
        }
        if (banks.size() == 0) {
          throw std::runtime_error("At least one language must be set before defining entries.");
        }
        int i = 0;
        int id = head.as_int();
        for_each_in_list(cdr(obj), [&](const goos::Object& entry) {
          if (entry.is_string()) {
            if (i >= int(banks.size())) {
              throw std::runtime_error(fmt::format("Too many strings in text id #x{:x}", id));
            }

            auto line = font->convert_utf8_to_game(entry.as_string()->data);
            banks[i++]->set_line(id, line);
          } else {
            throw std::runtime_error(fmt::format("Non-string value in text id #x{:x}", id));
          }
        });
        if (i != int(banks.size())) {
          throw std::runtime_error(
              fmt::format("Not enough strings specified in text id #x{:x}", id));
        }
      } else {
        throw std::runtime_error("Invalid game text file entry: " + head.print());
      }
    } else {
      throw std::runtime_error("Invalid game text file");
    }
  });
  if (banks.size() == 0) {
    throw std::runtime_error("At least one language must be set.");
  }
}

/*!
 * Parse a game subtitle file.
 * Information is added to the game subtitles database.
 *
 * The file should begin with (language-id x y z...) for the given language IDs.
 * Each scene should be (scene-name <entry 1> <entry 2> ... )
 * This adds the subtitle to each of the specified languages.
 */
void parse_subtitle(const goos::Object& data, GameSubtitleDB& db, const std::string& file_path) {
  const GameTextFontBank* font = nullptr;
  std::map<int, std::shared_ptr<GameSubtitleBank>> banks;

  for_each_in_list(data.as_pair()->cdr, [&](const goos::Object& obj) {
    if (obj.is_pair()) {
      auto& head = car(obj);
      if (head.is_symbol() && head.as_symbol()->name == "language-id") {
        if (banks.size() != 0) {
          throw std::runtime_error("Languages have been set multiple times.");
        }

        if (cdr(obj).is_empty_list()) {
          throw std::runtime_error("At least one language must be set.");
        }

        for_each_in_list(cdr(obj), [&](const goos::Object& obj) {
          auto lang = get_int(obj);
          if (!db.bank_exists(lang)) {
            // database has no lang yet
            banks[lang] = db.add_bank(std::make_shared<GameSubtitleBank>(lang));
            banks[lang]->file_path = file_path;
          } else {
            banks[lang] = db.bank_by_id(lang);
            banks[lang]->file_path = file_path;
          }
        });
      } else if (head.is_symbol("text-version")) {
        if (font) {
          throw std::runtime_error("text version is already set");
        }

        const auto& ver_name = car(cdr(obj));
        if (!ver_name.is_symbol()) {
          throw std::runtime_error("invalid text version entry");
        }

        font = get_font_bank(ver_name.as_symbol()->name);
      }

      else if (head.is_string() || head.is_int()) {
        if (!font) {
          throw std::runtime_error("Text version must be set before defining entries.");
        }
        if (banks.size() == 0) {
          throw std::runtime_error("At least one language must be set before defining scenes.");
        }
        auto kind = SubtitleSceneKind::Movie;
        int id = 0;
        auto entries = cdr(obj);
        if (head.is_int()) {
          kind = SubtitleSceneKind::Hint;
        } else if (entries.is_pair() && car(entries).is_symbol()) {
          const auto& parm = car(entries).as_symbol()->name;
          if (parm == ":hint") {
            entries = cdr(entries);
            id = car(entries).as_int();
            kind = SubtitleSceneKind::HintNamed;
          } else {
            throw std::runtime_error("Unknown parameter for subtitle scene");
          }
          entries = cdr(entries);
        }

        GameSubtitleSceneInfo scene(kind);
        if (kind == SubtitleSceneKind::Movie || kind == SubtitleSceneKind::HintNamed) {
          scene.set_name(head.as_string()->data);
        } else if (kind == SubtitleSceneKind::Hint) {
          id = head.as_int();
        }
        scene.set_id(id);
        scene.m_sorting_group = db.m_subtitle_groups->find_group(scene.name());
        scene.m_sorting_group_idx = db.m_subtitle_groups->find_group_index(scene.m_sorting_group);

        for_each_in_list(entries, [&](const goos::Object& entry) {
          if (entry.is_pair()) {
            // expected formats:
            // (time <args>)
            // all arguments have default values. the arguments are:
            // "speaker" "line" - two strings. one for the speaker's name and one for the actual
            //                    line. speaker can be empty. default is just empty string.
            // :offscreen - speaker is offscreen. default is not offscreen.

            if (!car(entry).is_int()) {
              throw std::runtime_error("Each entry must start with a timestamp (number)");
            }

            auto time = car(entry).as_int();
            goos::StringObject *speaker = nullptr, *line = nullptr;
            bool offscreen = false;
            if (scene.kind() == SubtitleSceneKind::Hint ||
                scene.kind() == SubtitleSceneKind::HintNamed) {
              offscreen = true;
            }
            for_each_in_list(cdr(entry), [&](const goos::Object& arg) {
              if (arg.is_string()) {
                if (!speaker) {
                  speaker = arg.as_string();
                } else if (!line) {
                  line = arg.as_string();
                } else {
                  throw std::runtime_error("Invalid string in subtitle entry");
                }
              } else if (speaker && !line) {
                throw std::runtime_error(
                    "Invalid object in subtitle entry, expecting actual line string after speaker");
              } else if (arg.is_symbol()) {
                if (scene.kind() == SubtitleSceneKind::Movie &&
                    arg.as_symbol()->name == ":offscreen") {
                  offscreen = true;
                } else {
                  throw std::runtime_error(
                      fmt::format("Unknown parameter {} in subtitle", arg.as_symbol()->name));
                }
              }
            });
            auto line_str = font->convert_utf8_to_game(line ? line->data : "");
            auto speaker_str = font->convert_utf8_to_game(speaker ? speaker->data : "");
            scene.add_line(time, line_str, speaker_str, offscreen);
          } else {
            throw std::runtime_error(
                fmt::format("{} | Each entry must be a non-empty list", scene.name()));
          }
        });
        for (auto& [lang, bank] : banks) {
          if (!bank->scene_exists(scene.name())) {
            bank->add_scene(scene);
          } else {
            auto& old_scene = bank->scene_by_name(scene.name());
            old_scene.from_other_scene(scene);
          }
        }
      } else {
        throw std::runtime_error("Invalid game subtitles file entry: " + head.print());
      }
    } else {
      throw std::runtime_error("Invalid game subtitles file");
    }
  });
  if (banks.size() == 0) {
    throw std::runtime_error("At least one language must be set.");
  }
}

GameTextVersion parse_text_only_version(const std::string& filename) {
  goos::Reader reader;
  return parse_text_only_version(reader.read_from_file({filename}));
}

GameTextVersion parse_text_only_version(const goos::Object& data) {
  const GameTextFontBank* font = nullptr;

  for_each_in_list(data.as_pair()->cdr, [&](const goos::Object& obj) {
    if (obj.is_pair()) {
      auto& head = car(obj);
      if (head.is_symbol("text-version")) {
        if (font) {
          throw std::runtime_error("text version is already set");
        }

        const auto& ver_name = car(cdr(obj));
        if (!ver_name.is_symbol()) {
          throw std::runtime_error("invalid text version entry");
        }

        font = get_font_bank(ver_name.as_symbol()->name);
      }
    }
  });

  if (!font) {
    throw std::runtime_error("text version not found");
  }

  return font->version();
}

void GameSubtitleGroups::hydrate_from_asset_file() {
  std::string file_path = (file_util::get_jak_project_dir() / "game" / "assets" / "jak1" /
                           "subtitle" / "subtitle-groups.json")
                              .string();
  auto config_str = file_util::read_text_file(file_path);
  auto group_data = parse_commented_json(config_str, file_path);

  for (const auto& [key, val] : group_data.items()) {
    try {
      if (key == group_order_key) {
        m_group_order = val.get<std::vector<std::string>>();
      } else {
        m_groups[key] = val.get<std::vector<std::string>>();
      }
    } catch (std::exception& ex) {
      lg::print("Bad subtitle group entry - {} - {}", key, ex.what());
    }
  }
}

std::string GameSubtitleGroups::find_group(const std::string& scene_name) {
  for (auto const& [group, scenes] : m_groups) {
    for (auto const& name : scenes) {
      if (name == scene_name) {
        return group;
      }
    }
  }
  // Add to the uncategorized group if it wasn't found
  m_groups[uncategorized_group].push_back(scene_name);
  return uncategorized_group;
}

int GameSubtitleGroups::find_group_index(const std::string& group_name) {
  auto it = find(m_group_order.begin(), m_group_order.end(), group_name);
  if (it != m_group_order.end()) {
    return it - m_group_order.begin();
  } else {
    return m_group_order.size() - 1;
  }
}

void GameSubtitleGroups::remove_scene(const std::string& group_name,
                                      const std::string& scene_name) {
  if (m_groups.count(group_name) == 0) {
    lg::error("Subtitle group {} doesn't exist! Abort.", group_name);
    return;
  }
  m_groups[group_name].erase(
      std::remove(m_groups[group_name].begin(), m_groups[group_name].end(), scene_name),
      m_groups[group_name].end());
}

void GameSubtitleGroups::add_scene(const std::string& group_name, const std::string& scene_name) {
  std::string group = group_name;
  if (m_groups.count(group_name) == 0) {
    lg::error("Subtitle group {} doesn't exist! Add to uncategorized.", group_name);
    group = uncategorized_group;
  }
  auto it = std::find(m_groups[group].begin(), m_groups[group].end(), scene_name);
  if (it != m_groups[group].end()) {
    lg::error("Scene {} already exists in group {}", scene_name, group);
  } else {
    m_groups[group].push_back(scene_name);
  }
}

// TODO - why not just return the inputs instead of passing in an empty one?
void open_text_project(const std::string& kind,
                       const std::string& filename,
                       std::vector<std::string>& inputs) {
  goos::Reader reader;
  auto& proj = reader.read_from_file({filename}).as_pair()->cdr.as_pair()->car;
  if (!proj.is_pair() || !proj.as_pair()->car.is_symbol() ||
      proj.as_pair()->car.as_symbol()->name != kind) {
    throw std::runtime_error(fmt::format("invalid {} project", kind));
  }

  goos::for_each_in_list(proj.as_pair()->cdr, [&](const goos::Object& o) {
    if (o.is_pair() && o.as_pair()->cdr.is_pair()) {
      auto& action = o.as_pair()->car.as_symbol()->name;

      if (action == "file") {
        auto& in = o.as_pair()->cdr.as_pair()->car.as_string()->data;
        inputs.push_back(in);
      } else {
        throw std::runtime_error(fmt::format("unknown action {} in {} project", action, kind));
      }
    } else {
      throw std::runtime_error(fmt::format("invalid entry in {} project", kind));
    }
  });
}

GameSubtitleDB load_subtitle_project() {
  // Load the subtitle files
  GameSubtitleDB db;
  db.m_subtitle_groups = std::make_unique<GameSubtitleGroups>();
  db.m_subtitle_groups->hydrate_from_asset_file();
  try {
    goos::Reader reader;
    std::vector<std::string> inputs;
    std::string subtitle_project =
        (file_util::get_jak_project_dir() / "game" / "assets" / "game_subtitle.gp").string();
    open_text_project("subtitle", subtitle_project, inputs);
    for (auto& filename : inputs) {
      auto code = reader.read_from_file({filename});
      parse_subtitle(code, db, filename);
    }
  } catch (std::runtime_error& e) {
    lg::error("error loading subtitle project: {}", e.what());
  }
  return db;
}

// TODO - write a deserializer, the compiler still can do the compiling!