//
//  ThemeData.cpp
//
//  Finds available themes on the file system and loads these,
//  including the parsing of individual theme components
//  (includes, features, variables, views, elements).
//

#include "ThemeData.h"

#include "components/ImageComponent.h"
#include "components/TextComponent.h"
#include "utils/FileSystemUtil.h"
#include "utils/StringUtil.h"
#include "Log.h"
#include "Platform.h"
#include "Settings.h"
#include <pugixml.hpp>
#include <algorithm>

std::vector<std::string> ThemeData::sSupportedViews {
            { "all" }, { "system" }, { "basic" }, { "detailed" }, { "grid" }, { "video" } };
std::vector<std::string> ThemeData::sSupportedFeatures {
            { "navigationsounds" }, { "video" }, { "carousel" }, { "z-index" }, { "visible" } };

std::map<std::string, std::map<std::string,
        ThemeData::ElementPropertyType>> ThemeData::sElementMap {
    { "image", {
        { "pos", NORMALIZED_PAIR },
        { "size", NORMALIZED_PAIR },
        { "maxSize", NORMALIZED_PAIR },
        { "origin", NORMALIZED_PAIR },
        { "rotation", FLOAT },
        { "rotationOrigin", NORMALIZED_PAIR },
        { "path", PATH },
        { "default", PATH },
        { "tile", BOOLEAN },
        { "color", COLOR },
        { "colorEnd", COLOR },
        { "gradientType", STRING },
        { "visible", BOOLEAN },
        { "zIndex", FLOAT } } },
    { "imagegrid", {
        { "pos", NORMALIZED_PAIR },
        { "size", NORMALIZED_PAIR },
        { "margin", NORMALIZED_PAIR },
        { "padding", NORMALIZED_RECT },
        { "autoLayout", NORMALIZED_PAIR },
        { "autoLayoutSelectedZoom", FLOAT },
        { "gameImage", PATH },
        { "folderImage", PATH },
        { "imageSource", STRING },
        { "scrollDirection", STRING },
        { "centerSelection", BOOLEAN },
        { "scrollLoop", BOOLEAN },
        { "animate", BOOLEAN },
        { "zIndex", FLOAT } } },
    { "gridtile", {
        { "size", NORMALIZED_PAIR },
        { "padding", NORMALIZED_PAIR },
        { "imageColor", COLOR },
        { "backgroundImage", PATH },
        { "backgroundCornerSize", NORMALIZED_PAIR },
        { "backgroundColor", COLOR },
        { "backgroundCenterColor", COLOR },
        { "backgroundEdgeColor", COLOR } } },
    { "text", {
        { "pos", NORMALIZED_PAIR },
        { "size", NORMALIZED_PAIR },
        { "origin", NORMALIZED_PAIR },
        { "rotation", FLOAT },
        { "rotationOrigin", NORMALIZED_PAIR },
        { "text", STRING },
        { "backgroundColor", COLOR },
        { "fontPath", PATH },
        { "fontSize", FLOAT },
        { "color", COLOR },
        { "alignment", STRING },
        { "forceUppercase", BOOLEAN },
        { "lineSpacing", FLOAT },
        { "value", STRING },
        { "visible", BOOLEAN },
        { "zIndex", FLOAT } } },
    { "textlist", {
        { "pos", NORMALIZED_PAIR },
        { "size", NORMALIZED_PAIR },
        { "origin", NORMALIZED_PAIR },
        { "selectorHeight", FLOAT },
        { "selectorOffsetY", FLOAT },
        { "selectorColor", COLOR },
        { "selectorColorEnd", COLOR },
        { "selectorGradientType", STRING },
        { "selectorImagePath", PATH },
        { "selectorImageTile", BOOLEAN },
        { "selectedColor", COLOR },
        { "primaryColor", COLOR },
        { "secondaryColor", COLOR },
        { "fontPath", PATH },
        { "fontSize", FLOAT },
        { "scrollSound", PATH },  // Need to keep this for backward compatibility with old themes.
        { "alignment", STRING },
        { "horizontalMargin", FLOAT },
        { "forceUppercase", BOOLEAN },
        { "lineSpacing", FLOAT },
        { "zIndex", FLOAT } } },
    { "container", {
        { "pos", NORMALIZED_PAIR },
        { "size", NORMALIZED_PAIR },
         { "origin", NORMALIZED_PAIR },
         { "visible", BOOLEAN },
         { "zIndex", FLOAT } } },
    { "ninepatch", {
        { "pos", NORMALIZED_PAIR },
        { "size", NORMALIZED_PAIR },
        { "path", PATH },
         { "visible", BOOLEAN },
        { "zIndex", FLOAT } } },
    { "datetime", {
        { "pos", NORMALIZED_PAIR },
        { "size", NORMALIZED_PAIR },
        { "origin", NORMALIZED_PAIR },
        { "rotation", FLOAT },
        { "rotationOrigin", NORMALIZED_PAIR },
        { "backgroundColor", COLOR },
        { "fontPath", PATH },
        { "fontSize", FLOAT },
        { "color", COLOR },
        { "alignment", STRING },
        { "forceUppercase", BOOLEAN },
        { "lineSpacing", FLOAT },
        { "value", STRING },
        { "format", STRING },
        { "displayRelative", BOOLEAN },
         { "visible", BOOLEAN },
         { "zIndex", FLOAT } } },
    { "rating", {
        { "pos", NORMALIZED_PAIR },
        { "size", NORMALIZED_PAIR },
        { "origin", NORMALIZED_PAIR },
        { "rotation", FLOAT },
        { "rotationOrigin", NORMALIZED_PAIR },
        { "color", COLOR },
        { "filledPath", PATH },
        { "unfilledPath", PATH },
        { "visible", BOOLEAN },
        { "zIndex", FLOAT } } },
    { "sound", {
        { "path", PATH } } },
    { "helpsystem", {
        { "pos", NORMALIZED_PAIR },
        { "origin", NORMALIZED_PAIR },
        { "textColor", COLOR },
        { "iconColor", COLOR },
        { "fontPath", PATH },
        { "fontSize", FLOAT } } },
    { "navigationsounds", {
        { "systembrowseSound", PATH },
        { "quicksysselectSound", PATH },
        { "selectSound", PATH },
        { "backSound", PATH },
        { "scrollSound", PATH },
        { "favoriteSound", PATH },
        { "launchSound", PATH } } },
    { "video", {
        { "pos", NORMALIZED_PAIR },
        { "size", NORMALIZED_PAIR },
        { "maxSize", NORMALIZED_PAIR },
        { "origin", NORMALIZED_PAIR },
        { "rotation", FLOAT },
        { "rotationOrigin", NORMALIZED_PAIR },
        { "default", PATH },
        { "delay", FLOAT },
         { "visible", BOOLEAN },
         { "zIndex", FLOAT },
        { "showSnapshotNoVideo", BOOLEAN },
        { "showSnapshotDelay", BOOLEAN } } },
    { "carousel", {
        { "type", STRING },
        { "size", NORMALIZED_PAIR },
        { "pos", NORMALIZED_PAIR },
        { "origin", NORMALIZED_PAIR },
        { "color", COLOR },
        { "colorEnd", COLOR },
        { "gradientType", STRING },
        { "logoScale", FLOAT },
        { "logoRotation", FLOAT },
        { "logoRotationOrigin", NORMALIZED_PAIR },
        { "logoSize", NORMALIZED_PAIR },
        { "logoAlignment", STRING },
        { "maxLogoCount", FLOAT },
        { "zIndex", FLOAT } } }
};

#define MINIMUM_THEME_FORMAT_VERSION 3
#define CURRENT_THEME_FORMAT_VERSION 6

// Helper.
unsigned int getHexColor(const char* str)
{
    ThemeException error;
    if (!str)
        throw error << "Empty color";

    size_t len = strlen(str);
    if (len != 6 && len != 8)
        throw error << "Invalid color (bad length, \"" << str << "\" - must be 6 or 8)";

    unsigned int val;
    std::stringstream ss;
    ss << str;
    ss >> std::hex >> val;

    if (len == 6)
        val = (val << 8) | 0xFF;

    return val;
}

std::map<std::string, std::string> mVariables;

std::string resolvePlaceholders(const char* in)
{
    std::string inStr(in);

    if (inStr.empty())
        return inStr;

    const size_t variableBegin = inStr.find("${");
    const size_t variableEnd   = inStr.find("}", variableBegin);

    if ((variableBegin == std::string::npos) || (variableEnd == std::string::npos))
        return inStr;

    std::string prefix  = inStr.substr(0, variableBegin);
    std::string replace = inStr.substr(variableBegin + 2, variableEnd - (variableBegin + 2));
    std::string suffix  = resolvePlaceholders(inStr.substr(variableEnd + 1).c_str());

    return prefix + mVariables[replace] + suffix;
}

ThemeData::ThemeData()
{
    mVersion = 0;
}

void ThemeData::loadFile(std::map<std::string, std::string> sysDataMap, const std::string& path)
{
    mPaths.push_back(path);

    ThemeException error;
    error.setFiles(mPaths);

    if (!Utils::FileSystem::exists(path))
        throw error << "File does not exist!";

    mVersion = 0;
    mViews.clear();
    mVariables.clear();

    mVariables.insert(sysDataMap.cbegin(), sysDataMap.cend());

    pugi::xml_document doc;
    pugi::xml_parse_result res = doc.load_file(path.c_str());
    if (!res)
        throw error << "XML parsing error: \n    " << res.description();

    pugi::xml_node root = doc.child("theme");
    if (!root)
        throw error << "Missing <theme> tag!";

    // parse version
    mVersion = root.child("formatVersion").text().as_float(-404);
    if (mVersion == -404)
        throw error << "<formatVersion> tag missing!\n   It's either out of date or you need "
                "to add <formatVersion>" << CURRENT_THEME_FORMAT_VERSION <<
                "</formatVersion> inside your <theme> tag.";

    if (mVersion < MINIMUM_THEME_FORMAT_VERSION)
        throw error << "Theme uses format version " << mVersion <<
                ". Minimum supported version is " << MINIMUM_THEME_FORMAT_VERSION << ".";

    parseVariables(root);
    parseIncludes(root);
    parseViews(root);
    parseFeatures(root);
}

void ThemeData::parseIncludes(const pugi::xml_node& root)
{
    ThemeException error;
    error.setFiles(mPaths);

    for (pugi::xml_node node = root.child("include"); node; node = node.next_sibling("include")) {
        std::string relPath = resolvePlaceholders(node.text().as_string());
        std::string path = Utils::FileSystem::resolveRelativePath(relPath, mPaths.back(), true);
        if (!ResourceManager::getInstance()->fileExists(path))
            throw error << "Included file \"" << relPath <<
                    "\" not found! (resolved to \"" << path << "\")";

        error << "    from included file \"" << relPath << "\":\n    ";

        mPaths.push_back(path);

        pugi::xml_document includeDoc;
        pugi::xml_parse_result result = includeDoc.load_file(path.c_str());
        if (!result)
            throw error << "Error parsing file: \n    " << result.description();

        pugi::xml_node theme = includeDoc.child("theme");
        if (!theme)
            throw error << "Missing <theme> tag!";

        parseVariables(theme);
        parseIncludes(theme);
        parseViews(theme);
        parseFeatures(theme);

        mPaths.pop_back();
    }
}

void ThemeData::parseFeatures(const pugi::xml_node& root)
{
    ThemeException error;
    error.setFiles(mPaths);

    for (pugi::xml_node node = root.child("feature"); node; node = node.next_sibling("feature")) {
        if (!node.attribute("supported"))
            throw error << "Feature missing \"supported\" attribute!";

        const std::string supportedAttr = node.attribute("supported").as_string();

        if (std::find(sSupportedFeatures.cbegin(), sSupportedFeatures.cend(),
                supportedAttr) != sSupportedFeatures.cend())
            parseViews(node);
    }
}

void ThemeData::parseVariables(const pugi::xml_node& root)
{
    ThemeException error;
    error.setFiles(mPaths);

    pugi::xml_node variables = root.child("variables");

    if (!variables)
        return;

    for (pugi::xml_node_iterator it = variables.begin(); it != variables.end(); ++it) {
        std::string key = it->name();
        std::string val = it->text().as_string();

        if (!val.empty())
            mVariables.insert(std::pair<std::string, std::string>(key, val));
    }
}

void ThemeData::parseViews(const pugi::xml_node& root)
{
    ThemeException error;
    error.setFiles(mPaths);

    // Parse views.
    for (pugi::xml_node node = root.child("view"); node; node = node.next_sibling("view")) {
        if (!node.attribute("name"))
            throw error << "View missing \"name\" attribute!";

        const char* delim = " \t\r\n,";
        const std::string nameAttr = node.attribute("name").as_string();
        size_t prevOff = nameAttr.find_first_not_of(delim, 0);
        size_t off = nameAttr.find_first_of(delim, prevOff);
        std::string viewKey;
        while (off != std::string::npos || prevOff != std::string::npos)
        {
            viewKey = nameAttr.substr(prevOff, off - prevOff);
            prevOff = nameAttr.find_first_not_of(delim, off);
            off = nameAttr.find_first_of(delim, prevOff);

            if (std::find(sSupportedViews.cbegin(), sSupportedViews.cend(),
                    viewKey) != sSupportedViews.cend()) {
                ThemeView& view = mViews.insert(std::pair<std::string,
                        ThemeView>(viewKey, ThemeView())).first->second;
                parseView(node, view);
            }
        }
    }
}

void ThemeData::parseView(const pugi::xml_node& root, ThemeView& view)
{
    ThemeException error;
    error.setFiles(mPaths);

    for (pugi::xml_node node = root.first_child(); node; node = node.next_sibling()) {
        if (!node.attribute("name"))
            throw error << "Element of type \"" << node.name() << "\" missing \"name\" attribute!";

        auto elemTypeIt = sElementMap.find(node.name());
        if (elemTypeIt == sElementMap.cend())
            throw error << "Unknown element of type \"" << node.name() << "\"!";

        const char* delim = " \t\r\n,";
        const std::string nameAttr = node.attribute("name").as_string();
        size_t prevOff = nameAttr.find_first_not_of(delim, 0);
        size_t off =  nameAttr.find_first_of(delim, prevOff);
        while (off != std::string::npos || prevOff != std::string::npos) {
            std::string elemKey = nameAttr.substr(prevOff, off - prevOff);
            prevOff = nameAttr.find_first_not_of(delim, off);
            off = nameAttr.find_first_of(delim, prevOff);

            parseElement(node, elemTypeIt->second,
                view.elements.insert(std::pair<std::string,
                        ThemeElement>(elemKey, ThemeElement())).first->second);

            if (std::find(view.orderedKeys.cbegin(), view.orderedKeys.cend(),
                    elemKey) == view.orderedKeys.cend())
                view.orderedKeys.push_back(elemKey);
        }
    }
}

void ThemeData::parseElement(const pugi::xml_node& root,
        const std::map<std::string, ElementPropertyType>& typeMap, ThemeElement& element)
{
    ThemeException error;
    error.setFiles(mPaths);

    element.type = root.name();
    element.extra = root.attribute("extra").as_bool(false);

    for (pugi::xml_node node = root.first_child(); node; node = node.next_sibling()) {
        auto typeIt = typeMap.find(node.name());
        if (typeIt == typeMap.cend())
            throw error << "Unknown property type \"" << node.name() <<
                    "\" (for element of type " << root.name() << ").";

        std::string str = resolvePlaceholders(node.text().as_string());

        switch (typeIt->second) {
        case NORMALIZED_RECT: {
            Vector4f val;

            auto splits = Utils::String::delimitedStringToVector(str, " ");
            if (splits.size() == 2) {
                val = Vector4f((float)atof(splits.at(0).c_str()), (float)atof(splits.at(1).c_str()),
                    (float)atof(splits.at(0).c_str()), (float)atof(splits.at(1).c_str()));
            }
            else if (splits.size() == 4) {
                val = Vector4f((float)atof(splits.at(0).c_str()), (float)atof(splits.at(1).c_str()),
                    (float)atof(splits.at(2).c_str()), (float)atof(splits.at(3).c_str()));
            }

            element.properties[node.name()] = val;
            break;
        }
        case NORMALIZED_PAIR: {
            size_t divider = str.find(' ');
            if (divider == std::string::npos)
                throw error << "invalid normalized pair (property \"" << node.name() <<
                        "\", value \"" << str.c_str() << "\")";

            std::string first = str.substr(0, divider);
            std::string second = str.substr(divider, std::string::npos);

            Vector2f val((float)atof(first.c_str()), (float)atof(second.c_str()));

            element.properties[node.name()] = val;
            break;
        }
        case STRING: {
            element.properties[node.name()] = str;
            break;
        }
        case PATH: {
            std::string path = Utils::FileSystem::resolveRelativePath(str, mPaths.back(), true);
            if (!ResourceManager::getInstance()->fileExists(path)) {
                std::stringstream ss;
                // "From theme yadda yadda, included file yadda yadda.
                ss << "  Warning " << error.msg;
                ss << "could not find file \"" << node.text().get() << "\" ";
                if (node.text().get() != path)
                    ss << "(which resolved to \"" << path << "\") ";
                LOG(LogWarning) << ss.str();
            }
            element.properties[node.name()] = path;
            break;
        }
        case COLOR: {
            element.properties[node.name()] = getHexColor(str.c_str());
            break;
        }
        case FLOAT: {
            float floatVal = static_cast<float>(strtod(str.c_str(), 0));
            element.properties[node.name()] = floatVal;
            break;
        }
        case BOOLEAN: {
            // Only look at first char.
            char first = str[0];
            // 1*, t* (true), T* (True), y* (yes), Y* (YES)
            bool boolVal = (first == '1' || first == 't' || first == 'T' ||
                    first == 'y' || first == 'Y');

            element.properties[node.name()] = boolVal;
            break;
        }
        default:
            throw error << "Unknown ElementPropertyType for \"" <<
                    root.attribute("name").as_string() << "\", property " << node.name();
        }
    }
}

bool ThemeData::hasView(const std::string& view)
{
    auto viewIt = mViews.find(view);
    return (viewIt != mViews.cend());
}

const ThemeData::ThemeElement* ThemeData::getElement(const std::string& view,
        const std::string& element, const std::string& expectedType) const
{
    auto viewIt = mViews.find(view);
    if (viewIt == mViews.cend())
        return nullptr; // Not found.

    auto elemIt = viewIt->second.elements.find(element);
    if (elemIt == viewIt->second.elements.cend()) return nullptr;

    if (elemIt->second.type != expectedType && !expectedType.empty()) {
        LOG(LogWarning) << " requested mismatched theme type for [" <<
                view << "." << element << "] - expected \""
                << expectedType << "\", got \"" << elemIt->second.type << "\"";
        return nullptr;
    }

    return &elemIt->second;
}

const std::shared_ptr<ThemeData>& ThemeData::getDefault()
{
    static std::shared_ptr<ThemeData> theme = nullptr;
    if (theme == nullptr) {
        theme = std::shared_ptr<ThemeData>(new ThemeData());

        const std::string path = Utils::FileSystem::getHomePath() +
                "/.emulationstation/es_theme_default.xml";
        if (Utils::FileSystem::exists(path)) {
            try {
                std::map<std::string, std::string> emptyMap;
                theme->loadFile(emptyMap, path);
            }
            catch(ThemeException& e) {
                LOG(LogError) << e.what();
                theme = std::shared_ptr<ThemeData>(new ThemeData()); // Reset to empty.
            }
        }
    }

    return theme;
}

std::vector<GuiComponent*> ThemeData::makeExtras(const std::shared_ptr<ThemeData>& theme,
        const std::string& view, Window* window)
{
    std::vector<GuiComponent*> comps;

    auto viewIt = theme->mViews.find(view);
    if (viewIt == theme->mViews.cend())
        return comps;

    for (auto it = viewIt->second.orderedKeys.cbegin();
            it != viewIt->second.orderedKeys.cend(); it++) {
        ThemeElement& elem = viewIt->second.elements.at(*it);
        if (elem.extra) {
            GuiComponent* comp = nullptr;
            const std::string& t = elem.type;
            if (t == "image")
                comp = new ImageComponent(window);
            else if (t == "text")
                comp = new TextComponent(window);

            comp->setDefaultZIndex(10);
            comp->applyTheme(theme, view, *it, ThemeFlags::ALL);
            comps.push_back(comp);
        }
    }

    return comps;
}

std::map<std::string, ThemeSet> ThemeData::getThemeSets()
{
    std::map<std::string, ThemeSet> sets;

    // Check for themes under the data installation directory for Unix or under the
    // executable directory for Windows, as well as under the user home directory regardless
    // of operating system.
    static const size_t pathCount = 2;
    std::string paths[pathCount] =
    {
        #ifdef _WIN64
        Utils::FileSystem::getExePath() + "/themes",
        #else
        Utils::FileSystem::getProgramDataPath() + "/themes",
        #endif
        Utils::FileSystem::getHomePath() + "/.emulationstation/themes"
    };

    for (size_t i = 0; i < pathCount; i++) {
        if (!Utils::FileSystem::isDirectory(paths[i]))
            continue;

        Utils::FileSystem::stringList dirContent = Utils::FileSystem::getDirContent(paths[i]);

        for (Utils::FileSystem::stringList::const_iterator it = dirContent.cbegin();
                it != dirContent.cend(); ++it) {
            if (Utils::FileSystem::isDirectory(*it)) {
                ThemeSet set = {*it};
                sets[set.getName()] = set;
            }
        }
    }

    return sets;
}

std::string ThemeData::getThemeFromCurrentSet(const std::string& system)
{
    std::map<std::string, ThemeSet> themeSets = ThemeData::getThemeSets();
    if (themeSets.empty())
        // No theme sets available.
        return "";

    std::map<std::string, ThemeSet>::const_iterator set =
            themeSets.find(Settings::getInstance()->getString("ThemeSet"));
    if (set == themeSets.cend()) {
        // Currently selected theme set is missing, so just pick the first available set.
        set = themeSets.cbegin();
        Settings::getInstance()->setString("ThemeSet", set->first);
    }

    return set->second.getThemePath(system);
}