// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/

#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include "Bml_Parser.h"

/* Copyright (C) 2013-2023 Christopher Snowhill. This module is free
software; you can redistribute it and/or modify it under the terms of
the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2.1 of the License, or (at your option) any
later version. This module is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
General Public License for more details. You should have received a copy
of the GNU Lesser General Public License along with this module; if not,
write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
Floor, Boston, MA 02110-1301 USA */

const char * strchr_limited( const char * in, const char * end, char c )
{
	while ( in < end && *in != c ) ++in;
	if ( in < end ) return in;
	else return 0;
}

Bml_Node Bml_Node::emptyNode;

Bml_Node::Bml_Node()
{
	name = 0;
	value = 0;
}

Bml_Node::Bml_Node(char const* name, size_t max_length)
{
	size_t length = 0;
	char const* ptr = name;
	while (*ptr && length < max_length) { ++ptr; ++length; }
	this->name = new char[ length + 1 ];
	memcpy( this->name, name, length );
	this->name[ length ] = '\0';
	value = 0;
}

Bml_Node::Bml_Node(const Bml_Node &in)
{
	size_t length;
	name = 0;
	if (in.name)
	{
		length = strlen(in.name);
		name = new char[length + 1];
		memcpy(name, in.name, length + 1);
	}
	value = 0;
	if (in.value)
	{
		length = strlen(in.value);
		value = new char[length + 1];
		memcpy(value, in.value, length + 1);
	}
	children = in.children;
}

Bml_Node::~Bml_Node()
{
	delete [] name;
	delete [] value;
}

void Bml_Node::clear()
{
	delete [] name;
	delete [] value;
	
	name = 0;
	value = 0;
	children.resize( 0 );
}

void Bml_Node::setLine(const char *line, size_t max_length)
{
	delete [] name;
	delete [] value;
	
	name = 0;
	value = 0;
	
	size_t length = 0;
	const char * end = line;
	while (*end && length < max_length) ++end;
	
	const char * line_end = strchr_limited(line, end, '\n');
	if ( !line_end ) line_end = end;
	
	const char * first_letter = line;
	while ( first_letter < line_end && *first_letter <= 0x20 ) first_letter++;
	
	const char * colon = strchr_limited(first_letter, line_end, ':');
	const char * last_letter = line_end - 1;
	
	if (colon)
	{
		const char * first_value_letter = colon + 1;
		while (first_value_letter < line_end && *first_value_letter <= 0x20) first_value_letter++;
		last_letter = line_end - 1;
		while (last_letter > first_value_letter && *last_letter <= 0x20) last_letter--;
		
		value = new char[last_letter - first_value_letter + 2];
		memcpy(value, first_value_letter, last_letter - first_value_letter + 1);
		value[last_letter - first_value_letter + 1] = '\0';
		
		last_letter = colon - 1;
	}
	
	while (last_letter > first_letter && *last_letter <= 0x20) last_letter--;
	
	name = new char[last_letter - first_letter + 2];
	memcpy(name, first_letter, last_letter - first_letter + 1);
	name[last_letter - first_letter + 1] = '\0';
}

Bml_Node& Bml_Node::addChild(const Bml_Node &child)
{
	children.push_back(child);
	return *(children.end() - 1);
}

const char * Bml_Node::getName() const
{
	return name;
}

const char * Bml_Node::getValue() const
{
	return value;
}

void Bml_Node::setValue(char const* value)
{
	delete [] this->value;
	size_t length = strlen( value ) + 1;
	this->value = new char[ length ];
	memcpy( this->value, value, length );
}

size_t Bml_Node::getChildCount() const
{
	return children.size();
}

Bml_Node const& Bml_Node::getChild(size_t index) const
{
	return children[index];
}

Bml_Node & Bml_Node::walkToNode(const char *path, bool use_indexes)
{
	Bml_Node * next_node;
	Bml_Node * node = this;
	while ( *path )
	{
		bool item_found = false;
		size_t array_index = 0;
		const char * array_index_start = strchr( path, '[' );
		const char * next_separator = strchr( path, ':' );
		if ( !next_separator ) next_separator = path + strlen(path);
		if ( use_indexes && array_index_start && array_index_start < next_separator )
		{
			char * temp;
			array_index = strtoul( array_index_start + 1, &temp, 10 );
		}
		else
		{
			array_index_start = next_separator;
		}
		if ( use_indexes )
		{
			for ( std::vector<Bml_Node>::iterator it = node->children.begin(); it != node->children.end(); ++it )
			{
				if ( size_t (array_index_start - path) == strlen(it->name) &&
				     strncmp( it->name, path, array_index_start - path ) == 0 )
				{
					next_node = &(*it);
					if ( array_index == 0 )
					{
						item_found = true;
						break;
					}
					--array_index;
				}
				if (array_index)
					item_found = false;
			}
		}
		else
		{
			for ( std::vector<Bml_Node>::iterator it = node->children.end(); it != node->children.begin(); )
			{
				--it;
				if ( size_t (next_separator - path) == strlen(it->name) &&
				     strncmp( it->name, path, next_separator - path ) == 0 )
				{
					next_node = &(*it);
					item_found = true;
					break;
				}
			}
		}
		if ( !item_found )
		{
			Bml_Node child( path, next_separator - path );
			node = &(node->addChild( child ));
		}
		else
			node = next_node;
		if ( *next_separator )
		{
			path = next_separator + 1;
		}
		else break;
	}
	return *node;
}

Bml_Node const& Bml_Node::walkToNode(const char *path) const
{
	Bml_Node const* next_node;
	Bml_Node const* node = this;
	while ( *path )
	{
		bool item_found = false;
		size_t array_index = 0;
		const char * array_index_start = strchr( path, '[' );
		const char * next_separator = strchr( path, ':' );
		if ( !next_separator ) next_separator = path + strlen(path);
		if ( array_index_start && array_index_start < next_separator )
		{
			char * temp;
			array_index = strtoul( array_index_start + 1, &temp, 10 );
		}
		else
		{
			array_index_start = next_separator;
		}
		for ( std::vector<Bml_Node>::const_iterator it = node->children.begin(), ite = node->children.end(); it != ite; ++it )
		{
			if ( size_t (array_index_start - path) == strlen(it->name) &&
			     strncmp( it->name, path, array_index_start - path ) == 0 )
			{
				next_node = &(*it);
				if ( array_index == 0 )
				{
					item_found = true;
					break;
				}
				--array_index;
			}
		}
		if ( !item_found ) return emptyNode;
		node = next_node;
		if ( *next_separator )
		{
			path = next_separator + 1;
		}
		else break;
	}
	return *node;
}

void Bml_Parser::parseDocument( const char * source, size_t max_length )
{
	std::vector<size_t> indents;
	std::string last_name;
	std::string current_path;
	
	document.clear();
	
	size_t last_indent = ~0ULL;
	
	Bml_Node node;
	
	size_t length = 0;
	const char * end = source;
	while ( *end && length < max_length ) { ++end; ++length; }
	
	while ( source < end )
	{
		const char * line_end = strchr_limited( source, end, '\n' );
		if ( !line_end ) line_end = end;
		
		if ( node.getName() ) last_name = node.getName();
		
		node.setLine( source, line_end - source );
		
		size_t indent = 0;
		while ( source < line_end && *source <= 0x20 )
		{
			source++;
			indent++;
		}
		
		if ( last_indent == ~0ULL ) last_indent = indent;
		
		if ( indent > last_indent )
		{
			indents.push_back( last_indent );
			last_indent = indent;
			if ( current_path.length() ) current_path += ":";
			current_path += last_name;
		}
		else if ( indent < last_indent )
		{
			while ( last_indent > indent && indents.size() )
			{
				last_indent = *(indents.end() - 1);
				indents.pop_back();
				size_t colon = current_path.find_last_of( ':' );
				if ( colon != std::string::npos ) current_path.resize( colon );
				else current_path.resize( 0 );
			}
			last_indent = indent;
		}

		document.walkToNode( current_path.c_str() ).addChild( node );

		source = line_end;
		while ( *source && *source == '\n' ) source++;
	}
}

const char * Bml_Parser::enumValue(std::string const& path) const
{
	return document.walkToNode(path.c_str()).getValue();
}

void Bml_Parser::setValue(std::string const& path, const char *value)
{
	document.walkToNode(path.c_str(), true).setValue(value);
}

void Bml_Parser::setValue(std::string const& path, long value)
{
	std::ostringstream str;
	str << value;
	setValue( path, str.str().c_str() );
}

void Bml_Parser::serialize(std::string & out) const
{
	std::ostringstream strOut;
	serialize(strOut, &document, 0);
	out = strOut.str();
}

void Bml_Parser::serialize(std::ostringstream & out, Bml_Node const* node, unsigned int indent) const
{
	for (unsigned i = 1; i < indent; ++i) out << "  ";
	
	if ( indent )
	{
		out << node->getName();
		if (node->getValue() && strlen(node->getValue())) out << ":" << node->getValue();
		out << std::endl;
	}
	
	for (size_t i = 0, j = node->getChildCount(); i < j; ++i)
	{
		Bml_Node const& child = node->getChild(i);
		if ( (!child.getValue() || !strlen(child.getValue())) && !child.getChildCount() )
			continue;
		serialize( out, &child, indent + 1 );
		if ( indent == 0 ) out << std::endl;
	}
}