/*
 * ModSecurity, http://www.modsecurity.org/
 * Copyright (c) 2015 - 2020 Trustwave Holdings, Inc. (http://www.trustwave.com/)
 *
 * You may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * If any of the files related to licensing are missing or if you have any
 * other questions related to licensing please contact Trustwave Holdings, Inc.
 * directly using the email address security@modsecurity.org.
 *
 */

#include "modsecurity/rules_exceptions.h"

#include <string>

#include "src/utils/string.h"
#include "src/variables/variable.h"
#include "src/actions/action_type_rule_metadata.h"
#include "src/actions/transformations/transformation.h"

namespace modsecurity {


RulesExceptions::RulesExceptions() {
}


RulesExceptions::~RulesExceptions() {
}


bool RulesExceptions::loadUpdateActionById(RuleId id,
    std::unique_ptr<std::vector<std::unique_ptr<actions::Action> > > actions,
    std::string *error) {

    for (auto &a : *actions) {
        if (dynamic_cast<actions::ActionTypeRuleMetaData *>(a.get())) {
            std::cout << "General failure, action: " << *a->getName();
            std::cout << " has not expected to be used with UpdateActionByID.";
            std::cout << std::endl;
            continue;
        }

        if (dynamic_cast<actions::transformations::Transformation *>(a.get())) {
            actions::transformations::Transformation *t = dynamic_cast<actions::transformations::Transformation *>(a.release());
            m_action_transformation_update_target_by_id.emplace(
                std::pair<RuleId,
                std::shared_ptr<actions::transformations::Transformation>>(id, std::shared_ptr<actions::transformations::Transformation>(t))
            );
            continue;

        }

        m_action_pos_update_target_by_id.emplace(
            std::pair<RuleId,
            std::unique_ptr<actions::Action>>(id , std::move(a))
        );
    }

    return true;
}


bool RulesExceptions::loadRemoveRuleByMsg(const std::string &msg,
    std::string *error) {
    m_remove_rule_by_msg.push_back(msg);

    return true;
}


bool RulesExceptions::loadRemoveRuleByTag(const std::string &msg,
    std::string *error) {
    m_remove_rule_by_tag.push_back(msg);

    return true;
}


bool RulesExceptions::loadUpdateTargetByMsg(const std::string &msg,
    std::unique_ptr<std::vector<std::unique_ptr<variables::Variable> > > var,
    std::string *error) {
    for (auto &i : *var) {
        m_variable_update_target_by_msg.emplace(
            std::pair<std::shared_ptr<std::string>,
            std::unique_ptr<variables::Variable>>(
                std::make_shared<std::string>(msg),
                std::move(i)));
    }

    return true;
}


bool RulesExceptions::loadUpdateTargetByTag(const std::string &tag,
    std::unique_ptr<std::vector<std::unique_ptr<variables::Variable> > > var,
    std::string *error) {

    for (auto &i : *var) {
        m_variable_update_target_by_tag.emplace(
            std::pair<std::shared_ptr<std::string>,
                std::unique_ptr<variables::Variable>>(
                    std::make_shared<std::string>(tag),
                    std::move(i)));
    }

    return true;
}


bool RulesExceptions::loadUpdateTargetById(RuleId id,
    std::unique_ptr<std::vector<std::unique_ptr<variables::Variable> > > var,
    std::string *error) {

    for (auto &i : *var) {
        m_variable_update_target_by_id.emplace(
            std::pair<RuleId,
                std::unique_ptr<variables::Variable>>(id,
                std::move(i)));
    }

    return true;
}


bool RulesExceptions::load(const std::string &a, std::string *error) {
    bool added = false;
    std::vector<std::string> toRemove = utils::string::ssplit(a, ' ');
    for (std::string &r : toRemove) {
        std::string b = modsecurity::utils::string::parserSanitizer(r);
        if (b.size() == 0) {
            continue;
        }

        size_t dash = b.find('-');
        if (dash != std::string::npos) {
            std::string n1s = std::string(b, 0, dash);
            std::string n2s = std::string(b, dash + 1, b.size() - (dash + 1));
            std::istringstream n1ss(n1s), n2ss(n2s);
            RuleId n1n = 0;
            RuleId n2n = 0;

            n1ss >> n1n;
            if (n1ss.fail()) {
                error->assign("Not a number: " + n1s);
                return false;
            }

            n2ss >> n2n;
            if (n2ss.fail()) {
                error->assign("Not a number: " + n2s);
                return false;
            }

            if (n1s > n2s) {
                error->assign("Invalid range: " + b);
                return false;
            }
            addRange(n1n, n2n);
            added = true;
        } else {
            std::istringstream iss(b);
            RuleId num;
            iss >> num;
            if (iss.fail()) {
                error->assign("Not a number or range: " + b);
                return false;
            }
            addNumber(num);
            added = true;
        }
    }

    if (added) {
        return true;
    }

    error->assign("Not a number or range: " + a);
    return false;
}


bool RulesExceptions::addNumber(RuleId a) {
    m_numbers.push_back(a);
    return true;
}


bool RulesExceptions::addRange(RuleId a, RuleId b) {
    m_ranges.push_back(std::make_pair(a, b));
    return true;
}


bool RulesExceptions::contains(RuleId a) {
    for (RuleId z : m_numbers) {
        if (a == z) {
            return true;
        }
    }

    for (auto z : m_ranges) {
        if (z.first <= a && z.second >= a) {
            return true;
        }
    }

    return false;
}


bool RulesExceptions::merge(RulesExceptions *from) {
    for (RuleId a : from->m_numbers) {
        bool ret = addNumber(a);
        if (ret == false) {
            return ret;
        }
    }
    for (auto b : from->m_ranges) {
        bool ret = addRange(b.first, b.second);
        if (ret == false) {
            return ret;
        }
    }

    for (auto &p : from->m_variable_update_target_by_tag) {
        m_variable_update_target_by_tag.emplace(
            std::pair<std::shared_ptr<std::string>,
            std::shared_ptr<variables::Variable>>(p.first,
                p.second));
    }

    for (auto &p : from->m_variable_update_target_by_msg) {
        m_variable_update_target_by_msg.emplace(
            std::pair<std::shared_ptr<std::string>,
            std::shared_ptr<variables::Variable>>(p.first,
                p.second));
    }

    for (auto &p : from->m_variable_update_target_by_id) {
        m_variable_update_target_by_id.emplace(
            std::pair<RuleId,
                std::shared_ptr<variables::Variable>>(p.first,
                    p.second));
    }

    for (auto &p : from->m_action_pos_update_target_by_id) {
        m_action_pos_update_target_by_id.emplace(
            std::pair<RuleId,
                std::shared_ptr<actions::Action>>(p.first,
                    p.second));
    }

    for (auto &p : from->m_action_transformation_update_target_by_id) {
        m_action_transformation_update_target_by_id.emplace(
            std::pair<RuleId,
                std::shared_ptr<actions::transformations::Transformation>>(p.first,
                    p.second));
    }

    for (auto &p : from->m_remove_rule_by_msg) {
        m_remove_rule_by_msg.push_back(p);
    }

    for (auto &p : from->m_remove_rule_by_tag) {
        m_remove_rule_by_tag.push_back(p);
    }

    return true;
}

}  // namespace modsecurity