#include "Config.hpp"
#include "format.hpp"
#include "Utils.hpp"
#include "LocalesUtils.hpp"

#include <assert.h>
#include <fstream>
#include <iostream>
#include <iomanip>
#include <boost/algorithm/string.hpp>
#include <boost/algorithm/string/classification.hpp>
#include <boost/algorithm/string/erase.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/config.hpp>
#include <boost/foreach.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/nowide/cenv.hpp>
#include <boost/nowide/iostream.hpp>
#include <boost/nowide/fstream.hpp>
#include <boost/property_tree/ini_parser.hpp>
#include <boost/format.hpp>
#include <string.h>

//FIXME for GCodeFlavor and gcfMarlin (for forward-compatibility conversion)
// This is not nice, likely it would be better to pass the ConfigSubstitutionContext to handle_legacy().
#include "PrintConfig.hpp"

namespace Slic3r {

// Escape \n, \r and backslash
std::string escape_string_cstyle(const std::string &str)
{
    // Allocate a buffer twice the input string length,
    // so the output will fit even if all input characters get escaped.
    std::vector<char> out(str.size() * 2, 0);
    char *outptr = out.data();
    for (size_t i = 0; i < str.size(); ++ i) {
        char c = str[i];
        if (c == '\r') {
            (*outptr ++) = '\\';
            (*outptr ++) = 'r';
        } else if (c == '\n') {
            (*outptr ++) = '\\';
            (*outptr ++) = 'n';
        } else if (c == '\\') {
            (*outptr ++) = '\\';
            (*outptr ++) = '\\';
        } else
            (*outptr ++) = c;
    }
    return std::string(out.data(), outptr - out.data());
}

std::string escape_strings_cstyle(const std::vector<std::string> &strs)
{
    // 1) Estimate the output buffer size to avoid buffer reallocation.
    size_t outbuflen = 0;
    for (size_t i = 0; i < strs.size(); ++ i)
        // Reserve space for every character escaped + quotes + semicolon.
        outbuflen += strs[i].size() * 2 + 3;
    // 2) Fill in the buffer.
    std::vector<char> out(outbuflen, 0);
    char *outptr = out.data();
    for (size_t j = 0; j < strs.size(); ++ j) {
        if (j > 0)
            // Separate the strings.
            (*outptr ++) = ';';
        const std::string &str = strs[j];
        // Is the string simple or complex? Complex string contains spaces, tabs, new lines and other
        // escapable characters. Empty string shall be quoted as well, if it is the only string in strs.
        bool should_quote = strs.size() == 1 && str.empty();
        for (size_t i = 0; i < str.size(); ++ i) {
            char c = str[i];
            if (c == ' ' || c == '\t' || c == '\\' || c == '"' || c == '\r' || c == '\n') {
                should_quote = true;
                break;
            }
        }
        if (should_quote) {
            (*outptr ++) = '"';
            for (size_t i = 0; i < str.size(); ++ i) {
                char c = str[i];
                if (c == '\\' || c == '"') {
                    (*outptr ++) = '\\';
                    (*outptr ++) = c;
                } else if (c == '\r') {
                    (*outptr ++) = '\\';
                    (*outptr ++) = 'r';
                } else if (c == '\n') {
                    (*outptr ++) = '\\';
                    (*outptr ++) = 'n';
                } else
                    (*outptr ++) = c;
            }
            (*outptr ++) = '"';
        } else {
            memcpy(outptr, str.data(), str.size());
            outptr += str.size();
        }
    }
    return std::string(out.data(), outptr - out.data());
}

// Unescape \n, \r and backslash
bool unescape_string_cstyle(const std::string &str, std::string &str_out)
{
    std::vector<char> out(str.size(), 0);
    char *outptr = out.data();
    for (size_t i = 0; i < str.size(); ++ i) {
        char c = str[i];
        if (c == '\\') {
            if (++ i == str.size())
                return false;
            c = str[i];
            if (c == 'r')
                (*outptr ++) = '\r';
            else if (c == 'n')
                (*outptr ++) = '\n';
            else
                (*outptr ++) = c;
        } else
            (*outptr ++) = c;
    }
    str_out.assign(out.data(), outptr - out.data());
    return true;
}

bool unescape_strings_cstyle(const std::string &str, std::vector<std::string> &out)
{
    if (str.empty())
        return true;

    size_t i = 0;
    for (;;) {
        // Skip white spaces.
        char c = str[i];
        while (c == ' ' || c == '\t') {
            if (++ i == str.size())
                return true;
            c = str[i];
        }
        // Start of a word.
        std::vector<char> buf;
        buf.reserve(16);
        // Is it enclosed in quotes?
        c = str[i];
        if (c == '"') {
            // Complex case, string is enclosed in quotes.
            for (++ i; i < str.size(); ++ i) {
                c = str[i];
                if (c == '"') {
                    // End of string.
                    break;
                }
                if (c == '\\') {
                    if (++ i == str.size())
                        return false;
                    c = str[i];
                    if (c == 'r')
                        c = '\r';
                    else if (c == 'n')
                        c = '\n';
                }
                buf.push_back(c);
            }
            if (i == str.size())
                return false;
            ++ i;
        } else {
            for (; i < str.size(); ++ i) {
                c = str[i];
                if (c == ';')
                    break;
                buf.push_back(c);
            }
        }
        // Store the string into the output vector.
        out.push_back(std::string(buf.data(), buf.size()));
        if (i == str.size())
            return true;
        // Skip white spaces.
        c = str[i];
        while (c == ' ' || c == '\t') {
            if (++ i == str.size())
                // End of string. This is correct.
                return true;
            c = str[i];
        }
        if (c != ';')
            return false;
        if (++ i == str.size()) {
            // Emit one additional empty string.
            out.push_back(std::string());
            return true;
        }
    }
}

std::string escape_ampersand(const std::string& str)
{
    // Allocate a buffer 2 times the input string length,
    // so the output will fit even if all input characters get escaped.
    std::vector<char> out(str.size() * 6, 0);
    char* outptr = out.data();
    for (size_t i = 0; i < str.size(); ++i) {
        char c = str[i];
        if (c == '&') {
            (*outptr++) = '&';
            (*outptr++) = '&';
        } else
            (*outptr++) = c;
    }
    return std::string(out.data(), outptr - out.data());
}

void ConfigOptionDeleter::operator()(ConfigOption* p) {
    delete p;
}

std::vector<std::string> ConfigOptionDef::cli_args(const std::string &key) const
{
	std::vector<std::string> args;
	if (this->cli != ConfigOptionDef::nocli) {
        std::string cli = this->cli.substr(0, this->cli.find("="));
        boost::trim_right_if(cli, boost::is_any_of("!"));
		if (cli.empty()) {
            // Add the key
            std::string opt = key;
            boost::replace_all(opt, "_", "-");
            args.emplace_back(std::move(opt));
        } else
			boost::split(args, cli, boost::is_any_of("|"));
    }
    return args;
}

ConfigOption* ConfigOptionDef::create_empty_option() const
{
	if (this->nullable) {
	    switch (this->type) {
	    case coFloats:          return new ConfigOptionFloatsNullable();
	    case coInts:            return new ConfigOptionIntsNullable();
	    case coPercents:        return new ConfigOptionPercentsNullable();
        case coFloatsOrPercents: return new ConfigOptionFloatsOrPercentsNullable();
	    case coBools:           return new ConfigOptionBoolsNullable();
	    default:                throw Slic3r::RuntimeError(std::string("Unknown option type for nullable option ") + this->label);
	    }
	} else {
	    switch (this->type) {
	    case coFloat:           return new ConfigOptionFloat();
	    case coFloats:          return new ConfigOptionFloats();
	    case coInt:             return new ConfigOptionInt();
	    case coInts:            return new ConfigOptionInts();
	    case coString:          return new ConfigOptionString();
	    case coStrings:         return new ConfigOptionStrings();
	    case coPercent:         return new ConfigOptionPercent();
	    case coPercents:        return new ConfigOptionPercents();
	    case coFloatOrPercent:  return new ConfigOptionFloatOrPercent();
        case coFloatsOrPercents: return new ConfigOptionFloatsOrPercents();
	    case coPoint:           return new ConfigOptionPoint();
	    case coPoints:          return new ConfigOptionPoints();
	    case coPoint3:          return new ConfigOptionPoint3();
	//    case coPoint3s:         return new ConfigOptionPoint3s();
	    case coBool:            return new ConfigOptionBool();
	    case coBools:           return new ConfigOptionBools();
	    case coEnum:            return new ConfigOptionEnumGeneric(this->enum_keys_map);
	    default:                throw Slic3r::RuntimeError(std::string("Unknown option type for option ") + this->label);
	    }
	}
}

ConfigOption* ConfigOptionDef::create_default_option() const
{
    if (this->default_value)
        return (this->default_value->type() == coEnum) ?
            // Special case: For a DynamicConfig, convert a templated enum to a generic enum.
            new ConfigOptionEnumGeneric(this->enum_keys_map, this->default_value->getInt()) :
            this->default_value->clone();
    return this->create_empty_option();
}

// Assignment of the serialization IDs is not thread safe. The Defs shall be initialized from the main thread!
ConfigOptionDef* ConfigDef::add(const t_config_option_key &opt_key, ConfigOptionType type)
{
	static size_t serialization_key_ordinal_last = 0;
    ConfigOptionDef *opt = &this->options[opt_key];
    opt->opt_key = opt_key;
    opt->type = type;
    opt->serialization_key_ordinal = ++ serialization_key_ordinal_last;
    this->by_serialization_key_ordinal[opt->serialization_key_ordinal] = opt;
    return opt;
}

ConfigOptionDef* ConfigDef::add_nullable(const t_config_option_key &opt_key, ConfigOptionType type)
{
	ConfigOptionDef *def = this->add(opt_key, type);
	def->nullable = true;
	return def;
}

std::ostream& ConfigDef::print_cli_help(std::ostream& out, bool show_defaults, std::function<bool(const ConfigOptionDef &)> filter) const
{
    // prepare a function for wrapping text
    auto wrap = [](std::string text, size_t line_length) -> std::string {
        std::istringstream words(text);
        std::ostringstream wrapped;
        std::string word;
 
        if (words >> word) {
            wrapped << word;
            size_t space_left = line_length - word.length();
            while (words >> word) {
                if (space_left < word.length() + 1) {
                    wrapped << '\n' << word;
                    space_left = line_length - word.length();
                } else {
                    wrapped << ' ' << word;
                    space_left -= word.length() + 1;
                }
            }
        }
        return wrapped.str();
    };

    // get the unique categories
    std::set<std::string> categories;
    for (const auto& opt : this->options) {
        const ConfigOptionDef& def = opt.second;
        if (filter(def))
            categories.insert(def.category);
    }
    
    for (auto category : categories) {
        if (category != "") {
            out << category << ":" << std::endl;
        } else if (categories.size() > 1) {
            out << "Misc options:" << std::endl;
        }
        
        for (const auto& opt : this->options) {
            const ConfigOptionDef& def = opt.second;
			if (def.category != category || def.cli == ConfigOptionDef::nocli || !filter(def))
                continue;
            
            // get all possible variations: --foo, --foobar, -f...
            std::vector<std::string> cli_args = def.cli_args(opt.first);
			if (cli_args.empty())
				continue;

            for (auto& arg : cli_args) {
                arg.insert(0, (arg.size() == 1) ? "-" : "--");
                if (def.type == coFloat || def.type == coInt || def.type == coFloatOrPercent
                    || def.type == coFloats || def.type == coInts) {
                    arg += " N";
                } else if (def.type == coPoint) {
                    arg += " X,Y";
                } else if (def.type == coPoint3) {
                    arg += " X,Y,Z";
                } else if (def.type == coString || def.type == coStrings) {
                    arg += " ABCD";
                }
            }
            
            // left: command line options
            const std::string cli = boost::algorithm::join(cli_args, ", ");
            out << " " << std::left << std::setw(20) << cli;
            
            // right: option description
            std::string descr = def.tooltip;
            bool show_defaults_this = show_defaults || def.opt_key == "config_compatibility";
            if (show_defaults_this && def.default_value && def.type != coBool
                && (def.type != coString || !def.default_value->serialize().empty())) {
                descr += " (";
                if (!def.sidetext.empty()) {
                    descr += def.sidetext + ", ";
                } else if (!def.enum_values.empty()) {
                    descr += boost::algorithm::join(def.enum_values, ", ") + "; ";
                }
                descr += "default: " + def.default_value->serialize() + ")";
            }
            
            // wrap lines of description
            descr = wrap(descr, 80);
            std::vector<std::string> lines;
            boost::split(lines, descr, boost::is_any_of("\n"));
            
            // if command line options are too long, print description in new line
            for (size_t i = 0; i < lines.size(); ++i) {
                if (i == 0 && cli.size() > 19)
                    out << std::endl;
                if (i > 0 || cli.size() > 19)
                    out << std::string(21, ' ');
                out << lines[i] << std::endl;
            }
        }
    }
    return out;
}

void ConfigBase::apply_only(const ConfigBase &other, const t_config_option_keys &keys, bool ignore_nonexistent)
{
    // loop through options and apply them
    for (const t_config_option_key &opt_key : keys) {
        // Create a new option with default value for the key.
        // If the key is not in the parameter definition, or this ConfigBase is a static type and it does not support the parameter,
        // an exception is thrown if not ignore_nonexistent.
        ConfigOption *my_opt = this->option(opt_key, true);
        if (my_opt == nullptr) {
            // opt_key does not exist in this ConfigBase and it cannot be created, because it is not defined by this->def().
            // This is only possible if other is of DynamicConfig type.
            if (ignore_nonexistent)
                continue;
            throw UnknownOptionException(opt_key);
        }
		const ConfigOption *other_opt = other.option(opt_key);
		if (other_opt == nullptr) {
            // The key was not found in the source config, therefore it will not be initialized!
//			printf("Not found, therefore not initialized: %s\n", opt_key.c_str());
		} else
            my_opt->set(other_opt);
    }
}

// this will *ignore* options not present in both configs
t_config_option_keys ConfigBase::diff(const ConfigBase &other) const
{
    t_config_option_keys diff;
    for (const t_config_option_key &opt_key : this->keys()) {
        const ConfigOption *this_opt  = this->option(opt_key);
        const ConfigOption *other_opt = other.option(opt_key);
        if (this_opt != nullptr && other_opt != nullptr && *this_opt != *other_opt)
            diff.emplace_back(opt_key);
    }
    return diff;
}

t_config_option_keys ConfigBase::equal(const ConfigBase &other) const
{
    t_config_option_keys equal;
    for (const t_config_option_key &opt_key : this->keys()) {
        const ConfigOption *this_opt  = this->option(opt_key);
        const ConfigOption *other_opt = other.option(opt_key);
        if (this_opt != nullptr && other_opt != nullptr && *this_opt == *other_opt)
            equal.emplace_back(opt_key);
    }
    return equal;
}

std::string ConfigBase::opt_serialize(const t_config_option_key &opt_key) const
{
    const ConfigOption* opt = this->option(opt_key);
    assert(opt != nullptr);
    return opt->serialize();
}

void ConfigBase::set(const std::string &opt_key, int value, bool create)
{
    ConfigOption *opt = this->option_throw(opt_key, create);
    switch (opt->type()) {
    	case coInt:    static_cast<ConfigOptionInt*>(opt)->value = value; break;
    	case coFloat:  static_cast<ConfigOptionFloat*>(opt)->value = value; break;
		case coFloatOrPercent:  static_cast<ConfigOptionFloatOrPercent*>(opt)->value = value; static_cast<ConfigOptionFloatOrPercent*>(opt)->percent = false; break;
		case coString: static_cast<ConfigOptionString*>(opt)->value = std::to_string(value); break;
    	default: throw BadOptionTypeException("Configbase::set() - conversion from int not possible");
    }
}

void ConfigBase::set(const std::string &opt_key, double value, bool create)
{
    ConfigOption *opt = this->option_throw(opt_key, create);
    switch (opt->type()) {
    	case coFloat:  			static_cast<ConfigOptionFloat*>(opt)->value = value; break;
    	case coFloatOrPercent:  static_cast<ConfigOptionFloatOrPercent*>(opt)->value = value; static_cast<ConfigOptionFloatOrPercent*>(opt)->percent = false; break;
        case coString: 			static_cast<ConfigOptionString*>(opt)->value = float_to_string_decimal_point(value); break;
    	default: throw BadOptionTypeException("Configbase::set() - conversion from float not possible");
    }
}

bool ConfigBase::set_deserialize_nothrow(const t_config_option_key &opt_key_src, const std::string &value_src, ConfigSubstitutionContext& substitutions_ctxt, bool append)
{
    t_config_option_key opt_key = opt_key_src;
    std::string         value   = value_src;
    // Both opt_key and value may be modified by handle_legacy().
    // If the opt_key is no more valid in this version of Slic3r, opt_key is cleared by handle_legacy().
    this->handle_legacy(opt_key, value);
    if (opt_key.empty())
        // Ignore the option.
        return true;
    return this->set_deserialize_raw(opt_key, value, substitutions_ctxt, append);
}

void ConfigBase::set_deserialize(const t_config_option_key &opt_key_src, const std::string &value_src, ConfigSubstitutionContext& substitutions_ctxt, bool append)
{
	if (! this->set_deserialize_nothrow(opt_key_src, value_src, substitutions_ctxt, append))
		throw BadOptionTypeException(format("ConfigBase::set_deserialize() failed for parameter \"%1%\", value \"%2%\"", opt_key_src,  value_src));
}

void ConfigBase::set_deserialize(std::initializer_list<SetDeserializeItem> items, ConfigSubstitutionContext& substitutions_ctxt)
{
	for (const SetDeserializeItem &item : items)
		this->set_deserialize(item.opt_key, item.opt_value, substitutions_ctxt, item.append);
}

bool ConfigBase::set_deserialize_raw(const t_config_option_key &opt_key_src, const std::string &value, ConfigSubstitutionContext& substitutions_ctxt, bool append)
{
    t_config_option_key    opt_key = opt_key_src;
    // Try to deserialize the option by its name.
    const ConfigDef       *def     = this->def();
    if (def == nullptr)
        throw NoDefinitionException(opt_key);
    const ConfigOptionDef *optdef  = def->get(opt_key);
    if (optdef == nullptr) {
        // If we didn't find an option, look for any other option having this as an alias.
        for (const auto &opt : def->options) {
            for (const t_config_option_key &opt_key2 : opt.second.aliases) {
                if (opt_key2 == opt_key) {
                    opt_key = opt.first;
                    optdef = &opt.second;
                    break;
                }
            }
            if (optdef != nullptr)
                break;
        }
        if (optdef == nullptr)
            throw UnknownOptionException(opt_key);
    }
    
    if (! optdef->shortcut.empty()) {
        // Aliasing for example "solid_layers" to "top_solid_layers" and "bottom_solid_layers".
        for (const t_config_option_key &shortcut : optdef->shortcut)
            // Recursive call.
            if (! this->set_deserialize_raw(shortcut, value, substitutions_ctxt, append))
                return false;
        return true;
    }
    
    ConfigOption *opt = this->option(opt_key, true);
    assert(opt != nullptr);
    bool success = opt->deserialize(value, append);
    if (! success && substitutions_ctxt.rule != ForwardCompatibilitySubstitutionRule::Disable &&
        // Only allow substitutions of an enum value by another enum value or a boolean value with an enum value.
        // That means, we expect enum values being added in the future and possibly booleans being converted to enums.
        (optdef->type == coEnum || optdef->type == coBool)) 
    {
        // Deserialize failed, try to substitute with a default value.
        assert(substitutions_ctxt.rule == ForwardCompatibilitySubstitutionRule::Enable || substitutions_ctxt.rule == ForwardCompatibilitySubstitutionRule::EnableSilent);

        opt->set(optdef->default_value.get());

        if (substitutions_ctxt.rule == ForwardCompatibilitySubstitutionRule::Enable) {
            // Log the substitution.
            ConfigSubstitution config_substitution;
            config_substitution.opt_def = optdef;
            config_substitution.old_value = value;//std::unique_ptr<ConfigOption>(opt);
            config_substitution.new_value = ConfigOptionUniquePtr(this->option(opt_key, true)->clone());
            substitutions_ctxt.substitutions.emplace_back(std::move(config_substitution));
        }
        return true;
    }
    return success;
}

// Return an absolute value of a possibly relative config variable.
// For example, return absolute infill extrusion width, either from an absolute value, or relative to the layer height.
double ConfigBase::get_abs_value(const t_config_option_key &opt_key) const
{
    // Get stored option value.
    const ConfigOption *raw_opt = this->option(opt_key);
    assert(raw_opt != nullptr);
    if (raw_opt->type() == coFloat)
        return static_cast<const ConfigOptionFloat*>(raw_opt)->value;
    if (raw_opt->type() == coFloatOrPercent) {
        // Get option definition.
        const ConfigDef *def = this->def();
        if (def == nullptr)
            throw NoDefinitionException(opt_key);
        const ConfigOptionDef *opt_def = def->get(opt_key);
        assert(opt_def != nullptr);
        // Compute absolute value over the absolute value of the base option.
        //FIXME there are some ratio_over chains, which end with empty ratio_with.
        // For example, XXX_extrusion_width parameters are not handled by get_abs_value correctly.
        return opt_def->ratio_over.empty() ? 0. : 
            static_cast<const ConfigOptionFloatOrPercent*>(raw_opt)->get_abs_value(this->get_abs_value(opt_def->ratio_over));
    }
    throw Slic3r::RuntimeError("ConfigBase::get_abs_value(): Not a valid option type for get_abs_value()");
}

// Return an absolute value of a possibly relative config variable.
// For example, return absolute infill extrusion width, either from an absolute value, or relative to a provided value.
double ConfigBase::get_abs_value(const t_config_option_key &opt_key, double ratio_over) const 
{
    // Get stored option value.
    const ConfigOption *raw_opt = this->option(opt_key);
    assert(raw_opt != nullptr);
    if (raw_opt->type() != coFloatOrPercent)
        throw Slic3r::RuntimeError("ConfigBase::get_abs_value(): opt_key is not of coFloatOrPercent");
    // Compute absolute value.
    return static_cast<const ConfigOptionFloatOrPercent*>(raw_opt)->get_abs_value(ratio_over);
}

void ConfigBase::setenv_() const
{
    t_config_option_keys opt_keys = this->keys();
    for (t_config_option_keys::const_iterator it = opt_keys.begin(); it != opt_keys.end(); ++it) {
        // prepend the SLIC3R_ prefix
        std::ostringstream ss;
        ss << "SLIC3R_";
        ss << *it;
        std::string envname = ss.str();
        
        // capitalize environment variable name
        for (size_t i = 0; i < envname.size(); ++i)
            envname[i] = (envname[i] <= 'z' && envname[i] >= 'a') ? envname[i]-('a'-'A') : envname[i];
        
        boost::nowide::setenv(envname.c_str(), this->opt_serialize(*it).c_str(), 1);
    }
}

ConfigSubstitutions ConfigBase::load(const std::string &file, ForwardCompatibilitySubstitutionRule compatibility_rule)
{
    return is_gcode_file(file) ? 
        this->load_from_gcode_file(file, true /* check header */, compatibility_rule) :
        this->load_from_ini(file, compatibility_rule);
}

ConfigSubstitutions ConfigBase::load_from_ini(const std::string &file, ForwardCompatibilitySubstitutionRule compatibility_rule)
{
    boost::property_tree::ptree tree;
    boost::nowide::ifstream ifs(file);
    boost::property_tree::read_ini(ifs, tree);
    return this->load(tree, compatibility_rule);
}

ConfigSubstitutions ConfigBase::load(const boost::property_tree::ptree &tree, ForwardCompatibilitySubstitutionRule compatibility_rule)
{
    ConfigSubstitutionContext substitutions_ctxt(compatibility_rule);
    for (const boost::property_tree::ptree::value_type &v : tree) {
        try {
            t_config_option_key opt_key = v.first;
            this->set_deserialize(opt_key, v.second.get_value<std::string>(), substitutions_ctxt);
        } catch (UnknownOptionException & /* e */) {
            // ignore
        }
    }
    return std::move(substitutions_ctxt.substitutions);
}

// Load the config keys from the tail of a G-code file.
ConfigSubstitutions ConfigBase::load_from_gcode_file(const std::string &file, bool check_header, ForwardCompatibilitySubstitutionRule compatibility_rule)
{
    // Read a 64k block from the end of the G-code.
	boost::nowide::ifstream ifs(file);
    if (check_header) {
		const char slic3r_gcode_header[] = "; generated by Slic3r ";
        const char prusaslicer_gcode_header[] = "; generated by PrusaSlicer ";
		std::string firstline;
		std::getline(ifs, firstline);
		if (strncmp(slic3r_gcode_header, firstline.c_str(), strlen(slic3r_gcode_header)) != 0 &&
            strncmp(prusaslicer_gcode_header, firstline.c_str(), strlen(prusaslicer_gcode_header)) != 0)
			throw Slic3r::RuntimeError("Not a PrusaSlicer / Slic3r PE generated g-code.");
	}
    ifs.seekg(0, ifs.end);
	auto file_length = ifs.tellg();
	auto data_length = std::min<std::fstream::pos_type>(65535, file_length);
	ifs.seekg(file_length - data_length, ifs.beg);
    std::vector<char> data(size_t(data_length) + 1, 0);
    ifs.read(data.data(), data_length);
    ifs.close();

    ConfigSubstitutionContext substitutions_ctxt(compatibility_rule);
    size_t key_value_pairs = load_from_gcode_string(data.data(), substitutions_ctxt);
    if (key_value_pairs < 80)
        throw Slic3r::RuntimeError(format("Suspiciously low number of configuration values extracted from %1%: %2%", file, key_value_pairs));
    return std::move(substitutions_ctxt.substitutions);
}

// Load the config keys from the given string.
size_t ConfigBase::load_from_gcode_string(const char* str, ConfigSubstitutionContext& substitutions)
{
    if (str == nullptr)
        return 0;

    // Walk line by line in reverse until a non-configuration key appears.
    const char *data_start = str;
    // boost::nowide::ifstream seems to cook the text data somehow, so less then the 64k of characters may be retrieved.
    const char *end = data_start + strlen(str);
    size_t num_key_value_pairs = 0;
    for (;;) {
        // Extract next line.
        for (--end; end > data_start && (*end == '\r' || *end == '\n'); --end);
        if (end == data_start)
            break;
        const char *start = end ++;
        for (; start > data_start && *start != '\r' && *start != '\n'; --start);
        if (start == data_start)
            break;
        // Extracted a line from start to end. Extract the key = value pair.
        if (end - (++ start) < 10 || start[0] != ';' || start[1] != ' ')
            break;
        const char *key = start + 2;
        if (!(*key >= 'a' && *key <= 'z') || (*key >= 'A' && *key <= 'Z'))
            // A key must start with a letter.
            break;
        const char *sep = key;
        for (; sep != end && *sep != '='; ++ sep) ;
        if (sep == end || sep[-1] != ' ' || sep[1] != ' ')
            break;
        const char *value = sep + 2;
        if (value > end)
            break;
        const char *key_end = sep - 1;
        if (key_end - key < 3)
            break;
        // The key may contain letters, digits and underscores.
        for (const char *c = key; c != key_end; ++ c)
            if (!((*c >= 'a' && *c <= 'z') || (*c >= 'A' && *c <= 'Z') || (*c >= '0' && *c <= '9') || *c == '_')) {
                key = nullptr;
                break;
            }
        if (key == nullptr)
            break;
        try {
            this->set_deserialize(std::string(key, key_end), std::string(value, end), substitutions);
            ++num_key_value_pairs;
        }
        catch (UnknownOptionException & /* e */) {
            // ignore
        }
        end = start;
    }

	return num_key_value_pairs;
}

void ConfigBase::save(const std::string &file) const
{
    boost::nowide::ofstream c;
    c.open(file, std::ios::out | std::ios::trunc);
    c << "# " << Slic3r::header_slic3r_generated() << std::endl;
    for (const std::string &opt_key : this->keys())
        c << opt_key << " = " << this->opt_serialize(opt_key) << std::endl;
    c.close();
}

// Set all the nullable values to nils.
void ConfigBase::null_nullables()
{
    for (const std::string &opt_key : this->keys()) {
        ConfigOption *opt = this->optptr(opt_key, false);
        assert(opt != nullptr);
        if (opt->nullable())
        	opt->deserialize("nil", ForwardCompatibilitySubstitutionRule::Disable);
    }
}

DynamicConfig::DynamicConfig(const ConfigBase& rhs, const t_config_option_keys& keys)
{
	for (const t_config_option_key& opt_key : keys)
		this->options[opt_key] = std::unique_ptr<ConfigOption>(rhs.option(opt_key)->clone());
}

bool DynamicConfig::operator==(const DynamicConfig &rhs) const
{
    auto it1     = this->options.begin();
    auto it1_end = this->options.end();
    auto it2     = rhs.options.begin();
    auto it2_end = rhs.options.end();
    for (; it1 != it1_end && it2 != it2_end; ++ it1, ++ it2)
		if (it1->first != it2->first || *it1->second != *it2->second)
			// key or value differ
			return false;
    return it1 == it1_end && it2 == it2_end;
}

// Remove options with all nil values, those are optional and it does not help to hold them.
size_t DynamicConfig::remove_nil_options()
{
	size_t cnt_removed = 0;
	for (auto it = options.begin(); it != options.end();)
		if (it->second->is_nil()) {
			it = options.erase(it);
			++ cnt_removed;
		} else
			++ it;
	return cnt_removed;
}

ConfigOption* DynamicConfig::optptr(const t_config_option_key &opt_key, bool create)
{
    auto it = options.find(opt_key);
    if (it != options.end())
        // Option was found.
        return it->second.get();
    if (! create)
        // Option was not found and a new option shall not be created.
        return nullptr;
    // Try to create a new ConfigOption.
    const ConfigDef       *def    = this->def();
    if (def == nullptr)
        throw NoDefinitionException(opt_key);
    const ConfigOptionDef *optdef = def->get(opt_key);
    if (optdef == nullptr)
//        throw Slic3r::RuntimeError(std::string("Invalid option name: ") + opt_key);
        // Let the parent decide what to do if the opt_key is not defined by this->def().
        return nullptr;
    ConfigOption *opt = optdef->create_default_option();
    this->options.emplace_hint(it, opt_key, std::unique_ptr<ConfigOption>(opt));
    return opt;
}

const ConfigOption* DynamicConfig::optptr(const t_config_option_key &opt_key) const
{
    auto it = options.find(opt_key);
    return (it == options.end()) ? nullptr : it->second.get();
}

void DynamicConfig::read_cli(const std::vector<std::string> &tokens, t_config_option_keys* extra, t_config_option_keys* keys)
{
    std::vector<const char*> args;    
    // push a bogus executable name (argv[0])
    args.emplace_back("");
    for (size_t i = 0; i < tokens.size(); ++ i)
        args.emplace_back(tokens[i].c_str());
    this->read_cli(int(args.size()), args.data(), extra, keys);
}

bool DynamicConfig::read_cli(int argc, const char* const argv[], t_config_option_keys* extra, t_config_option_keys* keys)
{
    // cache the CLI option => opt_key mapping
    std::map<std::string,std::string> opts;
    for (const auto &oit : this->def()->options)
        for (auto t : oit.second.cli_args(oit.first))
            opts[t] = oit.first;
    
    bool parse_options = true;
    for (int i = 1; i < argc; ++ i) {
        std::string token = argv[i];
        // Store non-option arguments in the provided vector.
        if (! parse_options || ! boost::starts_with(token, "-")) {
            extra->push_back(token);
            continue;
        }
#ifdef __APPLE__
        if (boost::starts_with(token, "-psn_"))
            // OSX launcher may add a "process serial number", for example "-psn_0_989382" to the command line.
            // While it is supposed to be dropped since OSX 10.9, we will rather ignore it.
            continue;
#endif /* __APPLE__ */
        // Stop parsing tokens as options when -- is supplied.
        if (token == "--") {
            parse_options = false;
            continue;
        }
        // Remove leading dashes
        boost::trim_left_if(token, boost::is_any_of("-"));
        // Remove the "no-" prefix used to negate boolean options.
        bool no = false;
        if (boost::starts_with(token, "no-")) {
            no = true;
            boost::replace_first(token, "no-", "");
        }
        // Read value when supplied in the --key=value form.
        std::string value;
        {
            size_t equals_pos = token.find("=");
            if (equals_pos != std::string::npos) {
                value = token.substr(equals_pos+1);
                token.erase(equals_pos);
            }
        }
        // Look for the cli -> option mapping.
        const auto it = opts.find(token);
        if (it == opts.end()) {
			boost::nowide::cerr << "Unknown option --" << token.c_str() << std::endl;
			return false;
        }
        const t_config_option_key opt_key = it->second;
        const ConfigOptionDef &optdef = this->def()->options.at(opt_key);
        // If the option type expects a value and it was not already provided,
        // look for it in the next token.
        if (optdef.type != coBool && optdef.type != coBools && value.empty()) {
            if (i == (argc-1)) {
				boost::nowide::cerr << "No value supplied for --" << token.c_str() << std::endl;
                return false;
            }
            value = argv[++ i];
        }
        // Store the option value.
        const bool               existing   = this->has(opt_key);
        if (keys != nullptr && ! existing) {
            // Save the order of detected keys.
            keys->push_back(opt_key);
        }
        ConfigOption            *opt_base   = this->option(opt_key, true);
        ConfigOptionVectorBase  *opt_vector = opt_base->is_vector() ? static_cast<ConfigOptionVectorBase*>(opt_base) : nullptr;
        if (opt_vector) {
			if (! existing)
				// remove the default values
				opt_vector->clear();
            // Vector values will be chained. Repeated use of a parameter will append the parameter or parameters
            // to the end of the value.
            if (opt_base->type() == coBools)
                static_cast<ConfigOptionBools*>(opt_base)->values.push_back(!no);
            else
                // Deserialize any other vector value (ConfigOptionInts, Floats, Percents, Points) the same way
                // they get deserialized from an .ini file. For ConfigOptionStrings, that means that the C-style unescape
                // will be applied for values enclosed in quotes, while values non-enclosed in quotes are left to be
                // unescaped by the calling shell.
				opt_vector->deserialize(value, true);
        } else if (opt_base->type() == coBool) {
            static_cast<ConfigOptionBool*>(opt_base)->value = !no;
        } else if (opt_base->type() == coString) {
            // Do not unescape single string values, the unescaping is left to the calling shell.
            static_cast<ConfigOptionString*>(opt_base)->value = value;
        } else {
            // Just bail out if the configuration value is not understood.
            ConfigSubstitutionContext context(ForwardCompatibilitySubstitutionRule::Disable);
            // Any scalar value of a type different from Bool and String.
            if (! this->set_deserialize_nothrow(opt_key, value, context, false)) {
				boost::nowide::cerr << "Invalid value supplied for --" << token.c_str() << std::endl;
				return false;
			}
        }
    }
    return true;
}

t_config_option_keys DynamicConfig::keys() const
{
    t_config_option_keys keys;
    keys.reserve(this->options.size());
    for (const auto &opt : this->options)
        keys.emplace_back(opt.first);
    return keys;
}

void StaticConfig::set_defaults()
{
    // use defaults from definition
    auto *defs = this->def();
    if (defs != nullptr) {
        for (const std::string &key : this->keys()) {
            const ConfigOptionDef   *def = defs->get(key);
            ConfigOption            *opt = this->option(key);
            if (def != nullptr && opt != nullptr && def->default_value)
                opt->set(def->default_value.get());
        }
    }
}

t_config_option_keys StaticConfig::keys() const 
{
    t_config_option_keys keys;
    assert(this->def() != nullptr);
    for (const auto &opt_def : this->def()->options)
        if (this->option(opt_def.first) != nullptr) 
            keys.push_back(opt_def.first);
    return keys;
}

}

#include <cereal/types/polymorphic.hpp>
CEREAL_REGISTER_TYPE(Slic3r::ConfigOption)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionSingle<double>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionSingle<int>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionSingle<std::string>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionSingle<Slic3r::Vec2d>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionSingle<Slic3r::Vec3d>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionSingle<bool>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionVectorBase)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionVector<double>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionVector<int>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionVector<std::string>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionVector<Slic3r::Vec2d>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionVector<unsigned char>)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionFloat)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionFloats)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionFloatsNullable)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionInt)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionInts)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionIntsNullable)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionString)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionStrings)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionPercent)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionPercents)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionPercentsNullable)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionFloatOrPercent)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionFloatsOrPercents)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionFloatsOrPercentsNullable)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionPoint)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionPoints)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionPoint3)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionBool)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionBools)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionBoolsNullable)
CEREAL_REGISTER_TYPE(Slic3r::ConfigOptionEnumGeneric)
CEREAL_REGISTER_TYPE(Slic3r::ConfigBase)
CEREAL_REGISTER_TYPE(Slic3r::DynamicConfig)

CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOption, Slic3r::ConfigOptionSingle<double>) 
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOption, Slic3r::ConfigOptionSingle<int>) 
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOption, Slic3r::ConfigOptionSingle<std::string>) 
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOption, Slic3r::ConfigOptionSingle<Slic3r::Vec2d>)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOption, Slic3r::ConfigOptionSingle<Slic3r::Vec3d>)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOption, Slic3r::ConfigOptionSingle<bool>) 
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOption, Slic3r::ConfigOptionVectorBase) 
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVectorBase, Slic3r::ConfigOptionVector<double>)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVectorBase, Slic3r::ConfigOptionVector<int>)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVectorBase, Slic3r::ConfigOptionVector<std::string>)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVectorBase, Slic3r::ConfigOptionVector<Slic3r::Vec2d>)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVectorBase, Slic3r::ConfigOptionVector<unsigned char>)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionSingle<double>, Slic3r::ConfigOptionFloat)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<double>, Slic3r::ConfigOptionFloats)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<double>, Slic3r::ConfigOptionFloatsNullable)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionSingle<int>, Slic3r::ConfigOptionInt)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<int>, Slic3r::ConfigOptionInts)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<int>, Slic3r::ConfigOptionIntsNullable)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionSingle<std::string>, Slic3r::ConfigOptionString)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<std::string>, Slic3r::ConfigOptionStrings)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionFloat, Slic3r::ConfigOptionPercent)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionFloats, Slic3r::ConfigOptionPercents)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionFloats, Slic3r::ConfigOptionPercentsNullable)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionPercent, Slic3r::ConfigOptionFloatOrPercent)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<Slic3r::FloatOrPercent>, Slic3r::ConfigOptionFloatsOrPercents)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<Slic3r::FloatOrPercent>, Slic3r::ConfigOptionFloatsOrPercentsNullable)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionSingle<Slic3r::Vec2d>, Slic3r::ConfigOptionPoint)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<Slic3r::Vec2d>, Slic3r::ConfigOptionPoints)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionSingle<Slic3r::Vec3d>, Slic3r::ConfigOptionPoint3)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionSingle<bool>, Slic3r::ConfigOptionBool)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<unsigned char>, Slic3r::ConfigOptionBools)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionVector<unsigned char>, Slic3r::ConfigOptionBoolsNullable)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigOptionInt, Slic3r::ConfigOptionEnumGeneric)
CEREAL_REGISTER_POLYMORPHIC_RELATION(Slic3r::ConfigBase, Slic3r::DynamicConfig)