#include "manage_hiscore_table.h"
#include <SDL2/SDL_error.h> // for SDL_GetError
#include <SDL2/SDL_rwops.h> // for SDL_RWread, SDL_RWwrite, SDL_RWFromFile
#include <stdlib.h>         // for free, malloc
#include <algorithm>        // for sort
#include <iostream>         // for basic_ostream, char_traits, operator<<
#include "utils.h"          // for HiScoreEntry

// Constructor
ManageHiScoreTable::ManageHiScoreTable(std::vector<HiScoreEntry> *table)
    : table_(table) {}

// Resetea la tabla a los valores por defecto
void ManageHiScoreTable::clear()
{
    // Limpia la tabla
    table_->clear();

    // Añade 10 entradas predefinidas
    table_->push_back({"Bry", 1000000});
    table_->push_back({"Usufondo", 500000});
    table_->push_back({"G.Lucas", 100000});
    table_->push_back({"P.Delgat", 50000});
    table_->push_back({"P.Arrabalera", 10000});
    table_->push_back({"Pelechano", 5000});
    table_->push_back({"Sahuquillo", 1000});
    table_->push_back({"Bacteriol", 500});
    table_->push_back({"Pepe", 200});
    table_->push_back({"Rosita", 100});
}

// Añade un elemento a la tabla
void ManageHiScoreTable::add(HiScoreEntry entry)
{
    // Añade la entrada a la tabla
    table_->push_back(entry);

    // Ordena la tabla
    sort();

    // Deja solo las 10 primeras entradas
    if (static_cast<int>(table_->size()) > 10)
    {
        table_->resize(10);
    }
}

// Ordena la tabla
void ManageHiScoreTable::sort()
{
    struct
    {
        bool operator()(const HiScoreEntry &a, const HiScoreEntry &b) const { return a.score > b.score; }
    } custom_less;

    std::sort(table_->begin(), table_->end(), custom_less);
}

// Carga la tabla con los datos de un fichero
bool ManageHiScoreTable::loadFromFile(const std::string &file_path)
{
    clear();

    auto success = true;
    auto file = SDL_RWFromFile(file_path.c_str(), "r+b");

    if (file)
    {
#ifdef VERBOSE
        const std::string file_name = file_path.substr(file_path.find_last_of("\\/") + 1);
        std::cout << "Reading file: " << file_name.c_str() << std::endl;
#endif
        for (int i = 0; i < (int)table_->size(); ++i)
        {
            int nameSize = 0;

            if (SDL_RWread(file, &table_->at(i).score, sizeof(int), 1) == 0)
            {
                success = false;
                break;
            }

            if (SDL_RWread(file, &nameSize, sizeof(int), 1) == 0)
            {
                success = false;
                break;
            }

            char *name = static_cast<char *>(malloc(nameSize + 1));
            if (SDL_RWread(file, name, sizeof(char) * nameSize, 1) == 0)
            {
                success = false;
                free(name);
                break;
            }
            else
            {
                name[nameSize] = 0;
                table_->at(i).name = name;
                free(name);
            }
        }

        SDL_RWclose(file);
    }

    if (!success)
    {
        clear();
    }

    return success;
}

// Guarda la tabla en un fichero
bool ManageHiScoreTable::saveToFile(const std::string &file_path)
{
#ifdef VERBOSE
    const std::string file_name = file_path.substr(file_path.find_last_of("\\/") + 1);
#endif
    auto success = true;
    auto file = SDL_RWFromFile(file_path.c_str(), "w+b");

    if (file)
    {
        // Guarda los datos
        for (int i = 0; i < (int)table_->size(); ++i)
        {
            SDL_RWwrite(file, &table_->at(i).score, sizeof(int), 1);
            const int nameSize = (int)table_->at(i).name.size();
            SDL_RWwrite(file, &nameSize, sizeof(int), 1);
            SDL_RWwrite(file, table_->at(i).name.c_str(), nameSize, 1);
        }

#ifdef VERBOSE
        std::cout << "Writing file: " << file_name.c_str() << std::endl;
#endif
        // Cierra el fichero
        SDL_RWclose(file);
    }
    else
    {
#ifdef VERBOSE
        std::cout << "Error: Unable to save " << file_name.c_str() << " file! " << SDL_GetError() << std::endl;
#endif
    }
    return success;
}