#include <hex/api/content_registry.hpp>

#include <hex/helpers/fs.hpp>
#include <hex/helpers/logger.hpp>

#include <hex/ui/view.hpp>

#include <filesystem>
#include <fstream>

#include <nlohmann/json.hpp>

namespace hex {

    namespace ContentRegistry::Settings {

        constexpr auto SettingsFile = "settings.json";

        void load() {
            bool loaded = false;
            for (const auto &dir : fs::getDefaultPaths(fs::ImHexPath::Config)) {
                std::ifstream settingsFile(dir / SettingsFile);

                if (settingsFile.good()) {
                    settingsFile >> getSettingsData();
                    loaded = true;
                    break;
                }
            }

            if (!loaded)
                store();
        }

        void store() {
            for (const auto &dir : fs::getDefaultPaths(fs::ImHexPath::Config)) {
                std::ofstream settingsFile(dir / SettingsFile, std::ios::trunc);

                if (settingsFile.good()) {
                    settingsFile << getSettingsData();
                    break;
                }
            }
        }

        void clear() {
            for (const auto &dir : fs::getDefaultPaths(fs::ImHexPath::Config)) {
                hex::fs::remove(dir / SettingsFile);
            }
        }

        static auto getCategoryEntry(const std::string &unlocalizedCategory) {
            auto &entries        = getEntries();
            const size_t curSlot = entries.size();
            auto found           = entries.find(Category { unlocalizedCategory });

            if (found == entries.end()) {
                auto [iter, _] = entries.emplace(Category { unlocalizedCategory, curSlot }, std::vector<Entry> {});
                return iter;
            }

            return found;
        }

        void add(const std::string &unlocalizedCategory, const std::string &unlocalizedName, i64 defaultValue, const Callback &callback, bool requiresRestart) {
            log::info("Registered new integer setting: [{}]: {}", unlocalizedCategory, unlocalizedName);

            getCategoryEntry(unlocalizedCategory)->second.emplace_back(Entry { unlocalizedName, requiresRestart, callback });

            auto &json = getSettingsData();

            if (!json.contains(unlocalizedCategory))
                json[unlocalizedCategory] = nlohmann::json::object();
            if (!json[unlocalizedCategory].contains(unlocalizedName) || !json[unlocalizedCategory][unlocalizedName].is_number())
                json[unlocalizedCategory][unlocalizedName] = int(defaultValue);
        }

        void add(const std::string &unlocalizedCategory, const std::string &unlocalizedName, const std::string &defaultValue, const Callback &callback, bool requiresRestart) {
            log::info("Registered new string setting: [{}]: {}", unlocalizedCategory, unlocalizedName);

            getCategoryEntry(unlocalizedCategory)->second.emplace_back(Entry { unlocalizedName, requiresRestart, callback });

            auto &json = getSettingsData();

            if (!json.contains(unlocalizedCategory))
                json[unlocalizedCategory] = nlohmann::json::object();
            if (!json[unlocalizedCategory].contains(unlocalizedName) || !json[unlocalizedCategory][unlocalizedName].is_string())
                json[unlocalizedCategory][unlocalizedName] = std::string(defaultValue);
        }

        void add(const std::string &unlocalizedCategory, const std::string &unlocalizedName, const std::vector<std::string> &defaultValue, const Callback &callback, bool requiresRestart) {
            log::info("Registered new string array setting: [{}]: {}", unlocalizedCategory, unlocalizedName);

            getCategoryEntry(unlocalizedCategory)->second.emplace_back(Entry { unlocalizedName, requiresRestart, callback });

            auto &json = getSettingsData();

            if (!json.contains(unlocalizedCategory))
                json[unlocalizedCategory] = nlohmann::json::object();
            if (!json[unlocalizedCategory].contains(unlocalizedName) || !json[unlocalizedCategory][unlocalizedName].is_array())
                json[unlocalizedCategory][unlocalizedName] = defaultValue;
        }

        void addCategoryDescription(const std::string &unlocalizedCategory, const std::string &unlocalizedCategoryDescription) {
            getCategoryDescriptions()[unlocalizedCategory] = unlocalizedCategoryDescription;
        }

        void write(const std::string &unlocalizedCategory, const std::string &unlocalizedName, i64 value) {
            auto &json = getSettingsData();

            if (!json.contains(unlocalizedCategory))
                json[unlocalizedCategory] = nlohmann::json::object();

            json[unlocalizedCategory][unlocalizedName] = value;
        }

        void write(const std::string &unlocalizedCategory, const std::string &unlocalizedName, const std::string &value) {
            auto &json = getSettingsData();

            if (!json.contains(unlocalizedCategory))
                json[unlocalizedCategory] = nlohmann::json::object();

            json[unlocalizedCategory][unlocalizedName] = value;
        }

        void write(const std::string &unlocalizedCategory, const std::string &unlocalizedName, const std::vector<std::string> &value) {
            auto &json = getSettingsData();

            if (!json.contains(unlocalizedCategory))
                json[unlocalizedCategory] = nlohmann::json::object();

            json[unlocalizedCategory][unlocalizedName] = value;
        }


        i64 read(const std::string &unlocalizedCategory, const std::string &unlocalizedName, i64 defaultValue) {
            auto &json = getSettingsData();

            if (!json.contains(unlocalizedCategory))
                return defaultValue;
            if (!json[unlocalizedCategory].contains(unlocalizedName))
                return defaultValue;

            if (!json[unlocalizedCategory][unlocalizedName].is_number())
                json[unlocalizedCategory][unlocalizedName] = defaultValue;

            return json[unlocalizedCategory][unlocalizedName].get<i64>();
        }

        std::string read(const std::string &unlocalizedCategory, const std::string &unlocalizedName, const std::string &defaultValue) {
            auto &json = getSettingsData();

            if (!json.contains(unlocalizedCategory))
                return defaultValue;
            if (!json[unlocalizedCategory].contains(unlocalizedName))
                return defaultValue;

            if (!json[unlocalizedCategory][unlocalizedName].is_string())
                json[unlocalizedCategory][unlocalizedName] = defaultValue;

            return json[unlocalizedCategory][unlocalizedName].get<std::string>();
        }

        std::vector<std::string> read(const std::string &unlocalizedCategory, const std::string &unlocalizedName, const std::vector<std::string> &defaultValue) {
            auto &json = getSettingsData();

            if (!json.contains(unlocalizedCategory))
                return defaultValue;
            if (!json[unlocalizedCategory].contains(unlocalizedName))
                return defaultValue;

            if (!json[unlocalizedCategory][unlocalizedName].is_array())
                json[unlocalizedCategory][unlocalizedName] = defaultValue;

            if (!json[unlocalizedCategory][unlocalizedName].array().empty() && !json[unlocalizedCategory][unlocalizedName][0].is_string())
                json[unlocalizedCategory][unlocalizedName] = defaultValue;

            return json[unlocalizedCategory][unlocalizedName].get<std::vector<std::string>>();
        }


        std::map<Category, std::vector<Entry>> &getEntries() {
            static std::map<Category, std::vector<Entry>> entries;

            return entries;
        }

        std::map<std::string, std::string> &getCategoryDescriptions() {
            static std::map<std::string, std::string> descriptions;

            return descriptions;
        }

        nlohmann::json getSetting(const std::string &unlocalizedCategory, const std::string &unlocalizedName) {
            auto &settings = getSettingsData();

            if (!settings.contains(unlocalizedCategory)) return {};
            if (!settings[unlocalizedCategory].contains(unlocalizedName)) return {};

            return settings[unlocalizedCategory][unlocalizedName];
        }

        nlohmann::json &getSettingsData() {
            static nlohmann::json settings;

            return settings;
        }

    }


    namespace ContentRegistry::CommandPaletteCommands {

        void add(Type type, const std::string &command, const std::string &unlocalizedDescription, const DisplayCallback &displayCallback, const ExecuteCallback &executeCallback) {
            log::info("Registered new command palette command: {}", command);

            getEntries().push_back(ContentRegistry::CommandPaletteCommands::Entry { type, command, unlocalizedDescription, displayCallback, executeCallback });
        }

        std::vector<Entry> &getEntries() {
            static std::vector<Entry> commands;

            return commands;
        }

    }


    namespace ContentRegistry::PatternLanguage {

        static std::string getFunctionName(const pl::api::Namespace &ns, const std::string &name) {
            std::string functionName;
            for (auto &scope : ns)
                functionName += scope + "::";

            functionName += name;

            return functionName;
        }

        std::unique_ptr<pl::PatternLanguage> createDefaultRuntime(prv::Provider *provider) {
            auto runtime = std::make_unique<pl::PatternLanguage>();

            runtime->setDataSource([provider](u64 offset, u8 *buffer, size_t size) {
                provider->read(offset, buffer, size);
            }, 0, 0);

            runtime->setIncludePaths(fs::getDefaultPaths(fs::ImHexPath::PatternsInclude));

            for (const auto &func : getFunctions()) {
                if (func.dangerous)
                    runtime->addDangerousFunction(func.ns, func.name, func.parameterCount, func.callback);
                else
                    runtime->addFunction(func.ns, func.name, func.parameterCount, func.callback);
            }

            for (const auto &[name, callback] : getPragmas()) {
                runtime->addPragma(name, callback);
            }

            return runtime;
        }

        void addPragma(const std::string &name, const pl::api::PragmaHandler &handler) {
            log::info("Registered new pattern language pragma: {}", name);

            getPragmas()[name] = handler;
        }

        void addFunction(const pl::api::Namespace &ns, const std::string &name, pl::api::FunctionParameterCount parameterCount, const pl::api::FunctionCallback &func) {
            log::info("Registered new pattern language function: {}", getFunctionName(ns, name));

            getFunctions().push_back({
                ns, name,
                parameterCount, func,
                false
            });
        }

        void addDangerousFunction(const pl::api::Namespace &ns, const std::string &name, pl::api::FunctionParameterCount parameterCount, const pl::api::FunctionCallback &func) {
            log::info("Registered new dangerous pattern language function: {}", getFunctionName(ns, name));

            getFunctions().push_back({
                ns, name,
                parameterCount, func,
                true
            });
        }

        std::map<std::string, pl::api::PragmaHandler> &getPragmas() {
            static std::map<std::string, pl::api::PragmaHandler> pragmas;

            return pragmas;
        }

        std::vector<impl::FunctionDefinition> &getFunctions() {
            static std::vector<impl::FunctionDefinition> functions;

            return functions;
        }

    }


    namespace ContentRegistry::Views {

        void impl::add(View *view) {
            log::info("Registered new view: {}", view->getUnlocalizedName());

            getEntries().insert({ view->getUnlocalizedName(), view });
        }

        std::map<std::string, View *> &getEntries() {
            static std::map<std::string, View *> views;

            return views;
        }

        View *getViewByName(const std::string &unlocalizedName) {
            auto &views = getEntries();

            if (views.contains(unlocalizedName))
                return views[unlocalizedName];
            else
                return nullptr;
        }

    }

    namespace ContentRegistry::Tools {

        void add(const std::string &unlocalizedName, const impl::Callback &function) {
            log::info("Registered new tool: {}", unlocalizedName);

            getEntries().emplace_back(impl::Entry { unlocalizedName, function });
        }

        std::vector<impl::Entry> &getEntries() {
            static std::vector<impl::Entry> entries;

            return entries;
        }

    }

    namespace ContentRegistry::DataInspector {

        void add(const std::string &unlocalizedName, size_t requiredSize, impl::GeneratorFunction displayGeneratorFunction, std::optional<impl::EditingFunction> editingFunction) {
            log::info("Registered new data inspector format: {}", unlocalizedName);

            getEntries().push_back({ unlocalizedName, requiredSize, std::move(displayGeneratorFunction), std::move(editingFunction) });
        }

        std::vector<impl::Entry> &getEntries() {
            static std::vector<impl::Entry> entries;

            return entries;
        }

    }

    namespace ContentRegistry::DataProcessorNode {

        void impl::add(const impl::Entry &entry) {
            log::info("Registered new data processor node type: [{}]: {}", entry.category, entry.name);

            getEntries().push_back(entry);
        }

        void addSeparator() {
            getEntries().push_back({ "", "", [] { return nullptr; } });
        }

        std::vector<impl::Entry> &getEntries() {
            static std::vector<impl::Entry> nodes;

            return nodes;
        }

    }

    namespace ContentRegistry::Language {

        void registerLanguage(const std::string &name, const std::string &languageCode) {
            log::info("Registered new language: {} ({})", name, languageCode);

            getLanguages().insert({ languageCode, name });
        }

        void addLocalizations(const std::string &languageCode, const LanguageDefinition &definition) {
            log::info("Registered new localization for language {} with {} entries", languageCode, definition.getEntries().size());

            getLanguageDefinitions()[languageCode].push_back(definition);
        }

        std::map<std::string, std::string> &getLanguages() {
            static std::map<std::string, std::string> languages;

            return languages;
        }

        std::map<std::string, std::vector<LanguageDefinition>> &getLanguageDefinitions() {
            static std::map<std::string, std::vector<LanguageDefinition>> definitions;

            return definitions;
        }

    }

    namespace ContentRegistry::Interface {

        void registerMainMenuItem(const std::string &unlocalizedName, u32 priority) {
            log::info("Registered new main menu item: {}", unlocalizedName);

            getMainMenuItems().insert({ priority, { unlocalizedName } });
        }

        void addMenuItem(const std::string &unlocalizedMainMenuName, u32 priority, const impl::DrawCallback &function) {
            log::info("Added new menu item to menu {} with priority {}", unlocalizedMainMenuName, priority);

            getMenuItems().insert({
                priority, {unlocalizedMainMenuName, function}
            });
        }

        void addWelcomeScreenEntry(const impl::DrawCallback &function) {
            getWelcomeScreenEntries().push_back(function);
        }

        void addFooterItem(const impl::DrawCallback &function) {
            getFooterItems().push_back(function);
        }

        void addToolbarItem(const impl::DrawCallback &function) {
            getToolbarItems().push_back(function);
        }

        void addSidebarItem(const std::string &icon, const impl::DrawCallback &function) {
            getSidebarItems().push_back({ icon, function });
        }

        void addTitleBarButton(const std::string &icon, const std::string &unlocalizedTooltip, const impl::ClickCallback &function) {
            getTitleBarButtons().push_back({ icon, unlocalizedTooltip, function });
        }

        void addLayout(const std::string &unlocalizedName, const impl::LayoutFunction &function) {
            log::info("Added new layout: {}", unlocalizedName);

            getLayouts().push_back({ unlocalizedName, function });
        }


        std::multimap<u32, impl::MainMenuItem> &getMainMenuItems() {
            static std::multimap<u32, impl::MainMenuItem> items;

            return items;
        }
        std::multimap<u32, impl::MenuItem> &getMenuItems() {
            static std::multimap<u32, impl::MenuItem> items;

            return items;
        }

        std::vector<impl::DrawCallback> &getWelcomeScreenEntries() {
            static std::vector<impl::DrawCallback> entries;

            return entries;
        }
        std::vector<impl::DrawCallback> &getFooterItems() {
            static std::vector<impl::DrawCallback> items;

            return items;
        }
        std::vector<impl::DrawCallback> &getToolbarItems() {
            static std::vector<impl::DrawCallback> items;

            return items;
        }
        std::vector<impl::SidebarItem> &getSidebarItems() {
            static std::vector<impl::SidebarItem> items;

            return items;
        }
        std::vector<impl::TitleBarButton> &getTitleBarButtons() {
            static std::vector<impl::TitleBarButton> buttons;

            return buttons;
        }

        std::vector<impl::Layout> &getLayouts() {
            static std::vector<impl::Layout> layouts;

            return layouts;
        }

    }

    namespace ContentRegistry::Provider {

        void impl::addProviderName(const std::string &unlocalizedName) {
            log::info("Registered new provider: {}", unlocalizedName);

            getEntries().push_back(unlocalizedName);
        }

        std::vector<std::string> &getEntries() {
            static std::vector<std::string> providerNames;

            return providerNames;
        }

    }

    namespace ContentRegistry::DataFormatter {

        void add(const std::string &unlocalizedName, const impl::Callback &callback) {
            log::info("Registered new data formatter: {}", unlocalizedName);

            getEntries().push_back({ unlocalizedName, callback });
        }

        std::vector<impl::Entry> &getEntries() {
            static std::vector<impl::Entry> entries;

            return entries;
        }

    }

    namespace ContentRegistry::FileHandler {

        void add(const std::vector<std::string> &extensions, const impl::Callback &callback) {
            for (const auto &extension : extensions)
                log::info("Registered new data handler for extensions: {}", extension);

            getEntries().push_back({ extensions, callback });
        }

        std::vector<impl::Entry> &getEntries() {
            static std::vector<impl::Entry> entries;

            return entries;
        }

    }

    namespace ContentRegistry::HexEditor {

        const int DataVisualizer::TextInputFlags = ImGuiInputTextFlags_AutoSelectAll | ImGuiInputTextFlags_NoHorizontalScroll;

        bool DataVisualizer::drawDefaultEditingTextBox(u64 address, const char *format, ImGuiDataType dataType, u8 *data, ImGuiInputTextFlags flags) const {
            struct UserData {
                u8 *data;
                i32 maxChars;

                bool editingDone;
            };

            UserData userData = {
                .data = data,
                .maxChars = this->getMaxCharsPerCell(),

                .editingDone = false
            };

            ImGui::PushID(reinterpret_cast<void*>(address));
            ImGui::InputScalarCallback("##editing_input", dataType, data, format, flags | TextInputFlags | ImGuiInputTextFlags_CallbackEdit, [](ImGuiInputTextCallbackData *data) -> int {
                auto &userData = *reinterpret_cast<UserData*>(data->UserData);

                if (data->BufTextLen >= userData.maxChars)
                    userData.editingDone = true;

                return 0;
            }, &userData);
            ImGui::PopID();

            return userData.editingDone || ImGui::IsKeyPressed(ImGuiKey_Enter) || ImGui::IsKeyPressed(ImGuiKey_Enter);
        }

        void impl::addDataVisualizer(const std::string &unlocalizedName, DataVisualizer *visualizer) {
            getVisualizers().insert({ unlocalizedName, visualizer });

        }

        std::map<std::string, DataVisualizer*> &impl::getVisualizers() {
            static std::map<std::string, DataVisualizer*> visualizers;

            return visualizers;
        }

    }

    namespace ContentRegistry::Hashes {

        std::vector<Hash *> &impl::getHashes() {
            static std::vector<Hash *> hashes;

            return hashes;
        }

        void impl::add(Hash *hash) {
            getHashes().push_back(hash);
        }

    }

}