#pragma once

#include "value.h"

#include <vector>
#include <string>
#include <iostream>

namespace Json
{
  class Value;

  /** \brief Abstract class for writers.
   */
  class JSON_API Writer
  {
  public:
    virtual ~Writer ();

    virtual std::string write (const Value &root) = 0;
  };

  /** \brief Outputs a Value in <a href="http://www.json.org">JSON</a> format without formatting (not human friendly).
   *
   * The JSON document is written in a single line. It is not intended for 'human' consumption,
   * but may be usefull to support feature such as RPC where bandwith is limited.
   * \sa Reader, Value
   */
  class JSON_API FastWriter
    : public Writer
  {
  public:
    FastWriter ();
    virtual ~FastWriter () { }

    void enableYAMLCompatibility ();

  public:
    /* overridden from Writer */
    virtual std::string write (const Value &root);

  private:
    void writeValue (const Value &value);

    std::string document_;
    bool yamlCompatiblityEnabled_;
  };

  /** \brief Writes a Value in <a href="http://www.json.org">JSON</a> format in a human friendly way.
   *
   * The rules for line break and indent are as follow:
   * - Object value:
   *     - if empty then print {} without indent and line break
   *     - if not empty the print '{', line break & indent, print one value per line
   *       and then unindent and line break and print '}'.
   * - Array value:
   *     - if empty then print [] without indent and line break
   *     - if the array contains no object value, empty array or some other value types,
   *       and all the values fit on one lines, then print the array on a single line.
   *     - otherwise, it the values do not fit on one line, or the array contains
   *       object or non empty array, then print one value per line.
   *
   * If the Value have comments then they are outputed according to their #CommentPlacement.
   *
   * \sa Reader, Value, Value::setComment()
   */
  class JSON_API StyledWriter
    : public Writer
  {
  public:
    StyledWriter ();
    virtual ~StyledWriter () { }

  public:
    /* overridden from Writer */
    /** \brief Serialize a Value in <a href="http://www.json.org">JSON</a> format.
     * \param root Value to serialize.
     * \return String containing the JSON document that represents the root value.
     */
    virtual std::string write (const Value &root);

  private:
    void writeValue (const Value &value);
    void writeArrayValue (const Value &value);
    bool isMultineArray (const Value &value);
    void pushValue (const std::string &value);
    void writeIndent ();
    void writeWithIndent (const std::string &value);
    void indent ();
    void unindent ();
    void writeCommentBeforeValue (const Value &root);
    void writeCommentAfterValueOnSameLine (const Value &root);
    bool hasCommentForValue (const Value &value);
    static std::string normalizeEOL (const std::string &text);

    typedef std::vector<std::string> ChildValues;

    ChildValues childValues_;
    std::string document_;
    std::string indentString_;
    int rightMargin_;
    int indentSize_;
    bool addChildValues_;
  };

  /** \brief Writes a Value in <a href="http://www.json.org">JSON</a> format in a human friendly way,
   *   to a stream rather than to a string.
   *
   * The rules for line break and indent are as follow:
   * - Object value:
   *     - if empty then print {} without indent and line break
   *     - if not empty the print '{', line break & indent, print one value per line
   *       and then unindent and line break and print '}'.
   * - Array value:
   *     - if empty then print [] without indent and line break
   *     - if the array contains no object value, empty array or some other value types,
   *       and all the values fit on one lines, then print the array on a single line.
   *     - otherwise, it the values do not fit on one line, or the array contains
   *       object or non empty array, then print one value per line.
   *
   * If the Value have comments then they are outputed according to their #CommentPlacement.
   *
   * \param indentation Each level will be indented by this amount extra.
   * \sa Reader, Value, Value::setComment()
   */
  class JSON_API StyledStreamWriter
  {
  public:
    StyledStreamWriter (std::string indentation = "\t");
    ~StyledStreamWriter () { }

  public:
    /** \brief Serialize a Value in <a href="http://www.json.org">JSON</a> format.
     * \param out Stream to write to. (Can be ostringstream, e.g.)
     * \param root Value to serialize.
     * \note There is no point in deriving from Writer, since write() should not return a value.
     */
    void write (std::ostream &out, const Value &root);

  private:
    void writeValue (const Value &value);
    void writeArrayValue (const Value &value);
    bool isMultineArray (const Value &value);
    void pushValue (const std::string &value);
    void writeIndent ();
    void writeWithIndent (const std::string &value);
    void indent ();
    void unindent ();
    void writeCommentBeforeValue (const Value &root);
    void writeCommentAfterValueOnSameLine (const Value &root);
    bool hasCommentForValue (const Value &value);
    static std::string normalizeEOL (const std::string &text);

    typedef std::vector<std::string> ChildValues;

    ChildValues childValues_;
    std::ostream *document_;
    std::string indentString_;
    std::string indentation_;
    long rightMargin_;
    bool addChildValues_;
  };

  std::string JSON_API valueToString (Int value);
  std::string JSON_API valueToString (UInt value);
  std::string JSON_API valueToString (double value);
  std::string JSON_API valueToString (bool value);
  std::string JSON_API valueToQuotedString (const char *value);

  /**
   * \brief Output using the StyledStreamWriter.
   * \see Json::operator>>()
   */
  std::ostream &operator << (std::ostream &os, const Value &root);
} /* namespace Json */