#ifndef XIV_DAT_INDEX_H
#define XIV_DAT_INDEX_H

#include "SqPack.h"

#include <unordered_map>

#include <experimental/filesystem>

namespace xiv {
namespace dat {

struct IndexBlockRecord;

class Index : public SqPack
{
public:
   // Full path to the index file
   Index( const std::experimental::filesystem::path& i_path );
   virtual ~Index();

   // An entry in the hash table, representing a file in a given dat
   struct HashTableEntry
   {
      uint32_t datNum;
      uint32_t dirHash;
      uint32_t filenameHash;
      uint32_t datOffset;
   };

   // HashTable has dir hashes -> filename hashes -> HashTableEntry
   using DirHashTable = std::unordered_map< uint32_t, HashTableEntry >;
   using HashTable = std::unordered_map< uint32_t, DirHashTable >;

   // Get the number of dat files the index is linked to
   uint32_t getDatCount() const;

   bool doesFileExist( uint32_t dir_hash, uint32_t filename_hash ) const;
   bool doesDirExist( uint32_t dir_hash ) const;

   // Returns the whole HashTable
   const HashTable& getHashTable() const;
   // Returns the hash table for a specific dir
   const DirHashTable& getDirHashTable( uint32_t dir_hash ) const;
   // Returns the HashTableEntry for a given file given its hashes
   const HashTableEntry& getHashTableEntry( uint32_t dir_hash, uint32_t filename_hash ) const;

protected:
   // Checks that the block is valid with regards to its hash
   void isIndexBlockValid( const IndexBlockRecord& i_index_block_record );

   uint32_t m_datCount;
   HashTable m_hashTable;
};
    
}
}

#endif // XIV_DAT_INDEX_H