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/// \file utils/sqlite/statement.hpp
/// Wrapper classes and utilities for SQLite statement processing.
///
/// This module contains thin RAII wrappers around the SQLite 3 structures
/// representing statements.

#if !defined(UTILS_SQLITE_STATEMENT_HPP)
#define UTILS_SQLITE_STATEMENT_HPP

extern "C" {
#include <stdint.h>
}

#include <string>

#include "utils/shared_ptr.hpp"

namespace utils {
namespace sqlite {


class database;


/// Representation of the SQLite data types.
enum type {
    type_blob,
    type_float,
    type_integer,
    type_null,
    type_text,
};


/// Representation of a BLOB.
class blob {
public:
    /// Memory representing the contents of the blob, or NULL if empty.
    ///
    /// This memory must remain valid throughout the life of this object, as we
    /// do not grab ownership of the memory.
    const void* memory;

    /// Number of bytes in memory.
    int size;

    /// Constructs a new blob.
    ///
    /// \param memory_ Pointer to the contents of the blob.
    /// \param size_ The size of memory_.
    blob(const void* memory_, const int size_) :
        memory(memory_), size(size_)
    {
    }
};


/// Representation of a SQL NULL value.
class null {
};


/// A RAII model for an SQLite 3 statement.
class statement {
    struct impl;

    /// Pointer to the shared internal implementation.
    std::shared_ptr< impl > _pimpl;

    statement(database&, void*);
    friend class database;

public:
    ~statement(void);

    bool step(void);
    void step_without_results(void);

    int column_count(void);
    std::string column_name(const int);
    type column_type(const int);
    int column_id(const char*);

    blob column_blob(const int);
    double column_double(const int);
    int column_int(const int);
    int64_t column_int64(const int);
    std::string column_text(const int);
    int column_bytes(const int);

    blob safe_column_blob(const char*);
    double safe_column_double(const char*);
    int safe_column_int(const char*);
    int64_t safe_column_int64(const char*);
    std::string safe_column_text(const char*);
    int safe_column_bytes(const char*);

    void reset(void);

    void bind(const int, const blob&);
    void bind(const int, const double);
    void bind(const int, const int);
    void bind(const int, const int64_t);
    void bind(const int, const null&);
    void bind(const int, const std::string&);
    template< class T > void bind(const char*, const T&);

    int bind_parameter_count(void);
    int bind_parameter_index(const std::string&);
    std::string bind_parameter_name(const int);

    void clear_bindings(void);
};


}  // namespace sqlite
}  // namespace utils

#endif  // !defined(UTILS_SQLITE_STATEMENT_HPP)