/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <config.h>

#include <Poco/JSON/Object.h>

#include "FileServer.hpp"

std::string FileServerRequestHandler::uiDefaultsToJSON(const std::string& uiDefaults, std::string& uiMode)
{
    static std::string previousUIDefaults;
    static std::string previousJSON("{}");
    static std::string previousUIMode;

    // early exit if we are serving the same thing
    if (uiDefaults == previousUIDefaults)
    {
        uiMode = previousUIMode;
        return previousJSON;
    }

    Poco::JSON::Object json;
    Poco::JSON::Object textDefs;
    Poco::JSON::Object spreadsheetDefs;
    Poco::JSON::Object presentationDefs;

    uiMode = "";
    StringVector tokens(Util::tokenize(uiDefaults, ';'));
    for (const auto& token : tokens)
    {
        StringVector keyValue(Util::tokenize(tokens.getParam(token), '='));
        Poco::JSON::Object* currentDef = nullptr;
        std::string key;

        // detect the UIMode or component
        if (keyValue[0] == "UIMode")
        {
            if (keyValue[1] == "classic" || keyValue[1] == "notebookbar")
            {
                json.set("uiMode", keyValue[1]);
                uiMode = keyValue[1];
            }
            else
                LOG_ERR("unknown UIMode value " << keyValue[1]);

            continue;
        }
        else if (Util::startsWith(keyValue[0], "Text"))
        {
            currentDef = &textDefs;
            key = keyValue[0].substr(4);
        }
        else if (Util::startsWith(keyValue[0], "Spreadsheet"))
        {
            currentDef = &spreadsheetDefs;
            key = keyValue[0].substr(11);
        }
        else if (Util::startsWith(keyValue[0], "Presentation"))
        {
            currentDef = &presentationDefs;
            key = keyValue[0].substr(12);
        }
        else
        {
            LOG_ERR("unknown UI default's component " << keyValue[0]);
            continue;
        }

        assert(currentDef);

        // detect the actual UI widget we want to hide or show
        if (key == "Ruler" || key == "Sidebar" || key == "Statusbar")
        {
            bool value(true);
            if (keyValue[1] == "false" || keyValue[1] == "False" || keyValue[1] == "0")
                value = false;

            currentDef->set("Show" + key, value);
        }
        else
        {
            LOG_ERR("unknown UI default " << keyValue[0]);
            continue;
        }
    }

    if (textDefs.size() > 0)
        json.set("text", textDefs);

    if (spreadsheetDefs.size() > 0)
        json.set("spreadsheet", spreadsheetDefs);

    if (presentationDefs.size() > 0)
        json.set("presentation", presentationDefs);

    std::ostringstream oss;
    Poco::JSON::Stringifier::stringify(json, oss);

    previousUIDefaults = uiDefaults;
    previousJSON = oss.str();
    previousUIMode = uiMode;

    return previousJSON;
}

namespace
{
bool isValidCss(const std::string& token)
{
    const std::string forbidden = "<>{}&|\\\"^`'$[]";
    for (auto c: token)
    {
        if (c < 0x20 || c >= 0x7F || forbidden.find(c) != std::string::npos)
            return false;
    }
    return true;
}
}

std::string FileServerRequestHandler::cssVarsToStyle(const std::string& cssVars)
{
    static std::string previousVars;
    static std::string previousStyle;

    // early exit if we are serving the same thing
    if (cssVars == previousVars)
        return previousStyle;

    std::ostringstream styleOSS;
    styleOSS << "<style>:root {";
    StringVector tokens(Util::tokenize(cssVars, ';'));
    for (const auto& token : tokens)
    {
        StringVector keyValue(Util::tokenize(tokens.getParam(token), '='));
        if (keyValue.size() < 2)
        {
            LOG_ERR("Skipping the token [" << tokens.getParam(token) << "] since it does not have '='");
            continue;
        }
        else if (keyValue.size() > 2)
        {
            LOG_ERR("Skipping the token [" << tokens.getParam(token) << "] since it has more than one '=' pair");
            continue;
        }

        if (!isValidCss(tokens.getParam(token)))
        {
            LOG_WRN("Skipping the token [" << tokens.getParam(token) << "] since it contains forbidden characters");
            continue;
        }

        styleOSS << keyValue[0] << ':' << keyValue[1] << ';';
    }
    styleOSS << "}</style>";

    previousVars = cssVars;
    previousStyle = styleOSS.str();

    return previousStyle;
}

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