#include "main.h"
#include "assets.h" 

string PadZeros(string input, size_t required_length) {
    return std::string(required_length - std::min(required_length, input.length()), '0') + input;
}
uint8_t TimeToComponentCount(double time_code) {
    int seconds = (int)time_code;
    int minutes = seconds / 60;
    seconds -= minutes * 60;
    int hours = minutes / 60;
    minutes -= hours * 60;
    if (hours > 0) {
        return 3;
    } else if (minutes > 0) {
        return 2;
    } else {
        return 1;
    }
}
string TimeToString(double time_code, uint8_t min_components = 1) {
    uint8_t components = std::max(TimeToComponentCount(time_code), min_components);
    int seconds = (int)time_code;
    int minutes = seconds / 60;
    seconds -= minutes * 60;
    int hours = minutes / 60;
    minutes -= hours * 60;
    string output = PadZeros(std::to_string(seconds), components < 2 ? 1 : 2);
    if (components >= 2) {
        output = PadZeros(std::to_string(minutes), components == 2 ? 1 : 2) + ":" + output;
    }
    if (components >= 3) {
        output = PadZeros(std::to_string(hours), components == 3 ? 1 : 2) + ":" + output;
    }
    return output;
}
void MainLoop::Init() {
    #ifdef PORTALS
    g_set_application_name("Neko Player");
    #endif
    // Our state
    show_demo_window = false;

    FileBrowser fileDialog(false, ImGuiFileBrowserFlags_NoTitleBar|ImGuiFileBrowserFlags_NoMove|ImGuiFileBrowserFlags_NoResize);
    fileDialog.SetPwd(path(userdir) / path("Music"));
    fileDialog.SetWindowSize(window_width, window_height);
    //fileDialog.SetWindowPos(0, 0);
    playback = new Playback();
    position = 0.0;
    prefs_window = false;
    theme_editor = false;
    stopped = true;
    about_window = false;
    string lang;
    {
        Json::Value config;
        std::ifstream stream;
        stream.open(path(prefPath) / "config.json");
        if (stream.is_open()) {
            stream >> config;
            if (config.isMember("theme_name")) {
                path themePath = theme->themeDir / config["theme_name"].asString();
                if (exists(themePath)) {
                    delete theme;
                    theme = new Theme(themePath);
                }
            }
            if (config.isMember("accent_color")) {
                accent_color = config["accent_color"].asFloat();
            }
            if (config.isMember("demo_window")) {
                show_demo_window = config["demo_window"].asBool();
            }
            if (config.isMember("vsync")) {
                vsync = config["vsync"].asBool();
            }
            if (config.isMember("framerate")) {
                framerate = config["framerate"].asUInt();
            }
            if (config.isMember("lang")) {
                Json::Value langValue;
                if (langValue.isNull()) {
                    lang = DEFAULT_LANG;
                } else {
                    lang = config["lang"].asString();
                }
                SET_LANG(lang.c_str());
            }
            stream.close();
        } 
        if (is_empty(Theme::themeDir)) {
            path lightPath = Theme::themeDir / "light.json";
            path darkPath = Theme::themeDir / "dark.json";
            string builtinDescription = _TRS_CTX("Built-in themes | Theme default strings | name", "(built-in)");
            if (!exists(lightPath)) {
                Theme light(false);
                ThemeStrings &strings = light.strings["fallback"];
                strings.name = _TRS_CTX("Built-in light theme | Theme default strings | name", "Default light");
                strings.description = builtinDescription;
                light.strings[CURRENT_LANGUAGE] = strings;
                light.Save(lightPath);
            }
            if (!exists(darkPath)) {
                Theme dark(true);
                ThemeStrings &strings = dark.strings["fallback"];
                strings.name = _TRS_CTX("Built-in dark theme | Theme default strings | name", "Default dark");
                strings.description = builtinDescription;
                dark.strings[CURRENT_LANGUAGE] = strings;
                dark.Save(darkPath);
            }
            delete theme;
            theme = new Theme(darkPath);
        }
    }
}
void MainLoop::GuiFunction() {
    position = playback->GetPosition();
    auto dockid = ImGui::DockSpaceOverViewport(nullptr, ImGuiDockNodeFlags_PassthruCentralNode|ImGuiDockNodeFlags_AutoHideTabBar);
    // 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
    if (show_demo_window)
        ImGui::ShowDemoWindow(&show_demo_window);
    if (ImGui::BeginMainMenuBar()) {
        if (ImGui::BeginMenu(_TRI_CTX(ICON_FK_FILE, "Main menu", "File"))) {
            if (ImGui::MenuItem(_TRI_CTX(ICON_FK_FOLDER_OPEN, "Main menu | File", "Open"))) {
                // Set translatable strings here so that they are in the correct language even when it changes at runtime.
                fileDialog.SetTitle(_TR_CTX("File dialog title", "Open..."));
                fileDialog.SetTypeFilters(_TR_CTX("File dialog filter name", "Audio files"), { ".wav", ".ogg", ".mp3", ".qoa", ".flac", ".xm", ".mod"});
                fileDialog.Open();
            }
            if (ImGui::MenuItem(_TRI_CTX(ICON_FK_WINDOW_CLOSE, "Main menu | File", "Quit"))) {
                done = true;
            }
            ImGui::EndMenu();
        }
        if (ImGui::BeginMenu(_TRI_CTX(ICON_FK_SCISSORS,"Main menu", "Edit"))) {
            if (ImGui::MenuItem(_TRI_CTX(ICON_FK_COG, "Main menu | Edit", "Preferences..."))) {
                prefs_window = true;
            }
            ImGui::EndMenu();
        }
        #ifdef DEBUG
        if (ImGui::BeginMenu(_TRI_CTX(ICON_FK_COG, "Main menu (in debug builds)", "Debug"))) {
            if (ImGui::MenuItem(_TR_CTX("Main menu | Debug", "Show ImGui Demo Window"), nullptr, show_demo_window)) {
                show_demo_window = !show_demo_window;
            }
            ImGui::EndMenu();
        }
        #endif
        if (ImGui::BeginMenu(_TRI_CTX(ICON_FK_INFO_CIRCLE, "Main menu", "Help"))) {
            if (ImGui::MenuItem(_TRI_CTX(ICON_FK_INFO, "Main menu | Help", "About"), nullptr, about_window)) {
                about_window = !about_window;
            }
            ImGui::EndMenu();
        }
        ImGui::EndMainMenuBar();
    }
    ImGui::SetNextWindowDockID(dockid);
    ImGui::Begin(_TRI_CTX(ICON_FK_PLAY, "Main window title", "Player"), nullptr, 0);
    {
        ImGui::SetCursorPosY(ImGui::GetWindowHeight() - ImGui::GetFrameHeightWithSpacing() - ImGui::GetFrameHeight() - ImGui::GetStyle().WindowPadding.y);
        if (ImGui::Button(playback->IsPaused() ? ICON_FK_PLAY "##Pause" : ICON_FK_PAUSE "##Pause")) {
            playback->Pause();
        }
        ImGui::SameLine();
        if (ImGui::Button(ICON_FK_REFRESH "##Restart")) {
            playback->Seek(0.0);
        }
        ImGui::SameLine();
        const int NEXT_SLIDER_COUNT = 1;
        ImGui::SetNextItemWidth(-(ImGui::GetFontSize() * (1 + (8 * NEXT_SLIDER_COUNT))) - ((ImGui::GetStyle().ItemSpacing.x + ImGui::GetStyle().FramePadding.x) * (NEXT_SLIDER_COUNT + 1)));
        uint8_t components = TimeToComponentCount(playback->GetLength());
        string time_str = TimeToString(position, components);
        if (ImGui::SliderFloat("##Seek", &position, 0.0f, playback->GetLength(), time_str.c_str(), ImGuiSliderFlags_NoRoundToFormat))
            playback->Seek(position);
        ImGui::SameLine();
        if (ImGui::Button(ICON_FK_STOP "##Stop")) {
            playback->Stop();
        }
        ImGui::SameLine();
        ImGui::SetNextItemWidth(ImGui::GetFontSize() * 8);
        if (ImGui::SliderFloat("##Volume", &playback->volume, 0.0, 100.0, ICON_FK_VOLUME_UP ": %.0f%%")) {
            playback->Update();
        }
        const float items = 3.0f;
        const float between_items = items - 1.0f;
        ImGui::PushItemWidth((ImGui::GetWindowWidth() / items) - (ImGui::GetStyle().ItemSpacing.x / (items / between_items)) - ((ImGui::GetStyle().WindowPadding.x / items) * 2.0f));
        if (ImGui::SliderFloat("##Speed", &playback->speed, 0.25, 4.0, _TR_CTX("Playback controls | slider", "Speed: %.2fx"), ImGuiSliderFlags_Logarithmic)) {
            playback->Update();
        }
        ImGui::SameLine();
        if (ImGui::SliderFloat("##Tempo", &playback->tempo, 0.25, 4.0, _TR_CTX("Playback controls | slider", "Tempo: %.2fx"), ImGuiSliderFlags_Logarithmic)) {
            playback->Update();
        }
        ImGui::SameLine();
        if (ImGui::SliderFloat("##Pitch", &playback->pitch, 0.25, 4.0, _TR_CTX("Playback controls | slider", "Pitch: %.2fx"), ImGuiSliderFlags_Logarithmic)) {
            playback->Update();
        }
        ImGui::PopItemWidth();
    }
    ImGui::End();
    if (prefs_window) {
        ImGui::SetNextWindowDockID(dockid);
        ImGui::Begin(_TRI_CTX(ICON_FK_COG, "Window title, window opened by menu item", "Preferences..."), &prefs_window);
        {
            if (ImGui::Checkbox(_TR_CTX("Preference | VSync checkbox", "Enable VSync"), &vsync)) {
                SDL_GL_SetSwapInterval(vsync ? 1 : 0);
            }
            ImGui::SameLine();
            ImGui::SetNextItemWidth(ImGui::GetWindowWidth() - ImGui::GetCursorPosX() - ImGui::GetStyle().WindowPadding.x);
            ImGui::SliderInt("##Framerate", &framerate, 10, 480, _TR_CTX("Preferences | Framerate slider", "Max framerate without VSync: %d"));
            if (ImGui::Button(_TRI_CTX(ICON_FK_MAGIC, "Preference | Related non-preference button", "Theme Editor"), ImVec2(ImGui::GetWindowWidth() - (ImGui::GetStyle().WindowPadding.x * 2.0f), 0))) {
                theme_editor = true;
            }
            static bool override_lang = lang != DEFAULT_LANG;
            if (ImGui::Checkbox(_TR_CTX("Preference | override enable checkbox", "Override language"), &override_lang)) {
                if (!override_lang) {
                    lang = DEFAULT_LANG;
                    SET_LANG(lang.c_str());
                }
            }
            if (override_lang) {
                ImGui::SameLine();
                ImGui::SetNextItemWidth(ImGui::GetWindowWidth() - ImGui::GetCursorPosX() - (ImGui::GetFontSize()) - ((ImGui::GetStyle().ItemSpacing.x + (ImGui::GetStyle().FramePadding.x * 2.0f))) - (ImGui::GetStyle().WindowPadding.x));
                ImGui::InputText("##LanguageOverrideTextBox", &lang);
                ImGui::SameLine();
                if (ImGui::Button(ICON_FK_CHECK)) {
                    SET_LANG(lang.c_str());
                }
            }
            static string filter = "";
            ImGui::Text(_TR_CTX("Preference | Theme selector | Filter label", "Filter:")); ImGui::SameLine();
            ImGui::SetNextItemWidth(ImGui::GetWindowWidth() - ImGui::GetCursorPosX() - ImGui::GetStyle().WindowPadding.x);
            ImGui::InputText("##FilterInput", &filter);
            ImGui::Text(_TR_CTX("Preferences | Theme selector | Selector label", "Select a theme..."));
            ImVec2 ChildSize = ImVec2(ImGui::GetWindowWidth() - (ImGui::GetStyle().WindowPadding.x * 2.0f), -ImGui::GetFrameHeightWithSpacing());
            if (ImGui::BeginChildFrame(ImGui::GetID("##ThemesContainer"), ChildSize)) {
                ImVec2 TableSize = ImVec2(0, 0);
                if (ImGui::BeginTable("##Themes", 2, ImGuiTableFlags_SizingFixedFit|ImGuiTableFlags_NoSavedSettings|ImGuiTableFlags_ScrollY, TableSize)) {
                    // Text in TableSetupColumn calls not translated because they're not visible to the user.
                    ImGui::TableSetupColumn("Name", ImGuiTableColumnFlags_WidthStretch);
                    ImGui::TableSetupColumn("Remove", 0);
                    for (auto themePath : Theme::availableThemes) {
                        string themeStem = themePath.stem().string();
                        if (themeStem.starts_with(filter)) {
                            ImGui::TableNextRow();
                            ImGui::TableSetColumnIndex(0);
                            const bool is_selected = themePath == theme->file_path;
                            if (ImGui::Selectable((theme->themeStrings[themePath].name + string(" (") + string(themeStem) + string(")")).c_str(), is_selected, 0)) {
                                delete theme;
                                theme = new Theme(themePath);
                                theme->Apply(accent_color);
                                break;
                            }
                            if (is_selected) {
                                ImGui::SetItemDefaultFocus();
                            } else {
                                ImGui::TableSetColumnIndex(1);
                                if (ImGui::SmallButton((string(ICON_FK_WINDOW_CLOSE "##") + themeStem).c_str())) {
                                    std::filesystem::remove(themePath);
                                    Theme::updateAvailableThemes();
                                    break;
                                }
                            }
                        }
                    }
                    ImGui::EndTable();
                }
            }
            ImGui::EndChildFrame();    
            ImGui::SetNextItemWidth(ImGui::GetWindowWidth() - (ImGui::GetStyle().WindowPadding.x * 2));
            if (ImGui::SliderFloat("##AccentColor", &accent_color, 0.0, 360.0, _TR_CTX("Preference | Accent hue slider, range 0-360 from HSV algorithm hue component", "Accent color hue: %.0f°"), ImGuiSliderFlags_NoRoundToFormat)) {
                theme->Apply(accent_color);
            }
        }
        ImGui::End();
    }
    if (about_window) {
        ImGui::SetNextWindowDockID(dockid);
        if (ImGui::Begin(_TRI_CTX(ICON_FK_INFO, "Window title, window opened by menu item", "About and Licenses"), &about_window)) {
            ImGui::PushFont(title);
            static const string APP_NAME_STR = _TR_CTX("Application name - Japanese word should remain Japanese and stay the same when translating for stylistic purposes.", "ねこ Player");
            ImGui::SetCursorPosX((ImGui::GetWindowWidth() - ImGui::GetFont()->CalcTextSizeA(ImGui::GetFontSize(), FLT_MAX, 0.0f, APP_NAME_STR.c_str()).x) / 2.0f);
            ImGui::Text(APP_NAME_STR.c_str());
            ImGui::PopFont();
            static const string APP_NAME_ROMANIZED = _TR_CTX("Application name - Japanese word should be converted to the translated language's characters. Use a string with only a single underscore to disable for Japanese.", "(Neko Player)");
            if (APP_NAME_ROMANIZED != "_") {
                ImGui::SetCursorPosX((ImGui::GetWindowWidth() - ImGui::GetFont()->CalcTextSizeA(ImGui::GetFontSize(), FLT_MAX, 0.0f, APP_NAME_ROMANIZED.c_str()).x) / 2.0f);
                ImGui::Text(APP_NAME_ROMANIZED.c_str());
            }
            static const string VER_STRING = _TR_CTX("Version string format specifier", "Version ") + string(TAG) + _TRS_CTX("Suffix to the version string in the about window, if needed", " ");
            ImGui::SetCursorPosX((ImGui::GetWindowWidth() - ImGui::GetFont()->CalcTextSizeA(ImGui::GetFontSize(), FLT_MAX, 0.0f, VER_STRING.c_str()).x) / 2.0f);
            ImGui::Text(VER_STRING.c_str());
            ImGui::NewLine();
            static vector<LicenseData> projects = {
                LicenseData(APP_NAME_STR, "MIT"),
                LicenseData(_TR_CTX("Library name", "SDL Mixer X"), "Zlib"),
                LicenseData(_TR_CTX("Library name", "JsonCpp"), "MIT"),
                LicenseData(_TR_CTX("Library name", "SoundTouch"), "LGPL-2.1-only"),
                LicenseData(_TR_CTX("Library name", "libintl"), "LGPL-2.1-only"),
                LicenseData(_TR_CTX("Library name", "Dear ImGui"), "MIT"),
                LicenseData(_TR_CTX("Library name", "imgui-filebrowser"), "MIT"),
                #ifdef PORTALS
                LicenseData(_TR_CTX("Library name", "libportal"), "LGPL-3.0-only"), // Only include the license if it applies.
                #endif
                LicenseData(_TR_CTX("Library name", "Noto Sans"), "OFL-1.1-RFN"),
                LicenseData(_TR_CTX("Library name", "Fork Awesome"), "OFL-1.1-RFN"),
                LicenseData(_TR_CTX("Library name", "IconFontCppHeaders"), "Zlib")
            };
            // Do this in an inner scope so that 'i' isn't accidentally used outside it,
            // and so that 'i' can refer to another variable such as in a for loop.
            {
                int i = 0;
                // Use a variable instead of hardcoding so that a #ifdef can change the indices later on.
                LOAD_LICENSE(projects[i], nekoplayer); i++;
                LOAD_LICENSE(projects[i], sdl_mixer_x); i++;
                LOAD_LICENSE(projects[i], jsoncpp); i++;
                LOAD_LICENSE(projects[i], soundtouch); i++;
                LOAD_LICENSE(projects[i], libintl); i++;
                LOAD_LICENSE(projects[i], imgui); i++;
                LOAD_LICENSE(projects[i], imgui_filebrowser); i++;
                #ifdef PORTALS
                LOAD_LICENSE(projects[i], libportal); i++;
                #endif
                LOAD_LICENSE(projects[i], notosans); i++;
                LOAD_LICENSE(projects[i], forkawesome); i++;
                LOAD_LICENSE(projects[i], icnfntcpphdrs); i++;
            }
            // Left
            static LicenseData selected = projects[0];
            {
                ImGui::BeginGroup();
                ImGui::TextUnformatted(_TR_CTX("Project selector label.", "Project"));
                // Next string is internal.
                ImGui::BeginChild("project selector", ImVec2(150, 0), true);
                for (auto project : projects)
                {
                    if (ImGui::Selectable(project.Project.c_str(), selected.Project == project.Project))
                        selected = project;
                }
                ImGui::EndChild();
                ImGui::EndGroup();
            }
            ImGui::SameLine();
            // Right
            {
                ImGui::BeginGroup();
                ImGui::TextUnformatted(_TR_CTX("License viewer label", "License"));
                // Next string is internal.
                ImGui::BeginChild("license view", ImVec2(0, 0), true); // *don't* leave room for the nonexistant line below us!
                ImGui::Text(_TR_CTX("License viewer | information above license - string 1: selected project, string 2: SPDX license identifier", "%s: %s"), selected.Project.c_str(), selected.Spdx.c_str());
                ImGui::Separator();
                ImGui::TextWrapped("%s", selected.LicenseContents.c_str());
                ImGui::EndChild();
                ImGui::EndGroup();
            }
        }
        ImGui::End();
    }
    // Display the theme editor.
    if (theme_editor) {
        Theme::ShowEditor(&theme_editor, theme, dockid, window_width, window_height);
        // Immediately apply any changes made in the theme editor.
        theme->Apply(accent_color);
    }
    if (fileDialog.IsOpened()) {
        // Make the fallback file dialog fill the window.
        fileDialog.SetWindowSize(window_width, window_height);
        fileDialog.SetWindowPos(0, 0);
    }
    // Display the file dialog
    fileDialog.Display();

    // Load a new file when it has been selected.
    if (fileDialog.HasSelected()) {
        playback->Start(fileDialog.GetSelected().string());
        // Update the window title.
        SetWindowTitle((fileDialog.GetSelected().filename().replace_extension("").string() + std::string(" - ") + std::string(NAME)).c_str());
        // Make sure to not load the file unnecessarily.
        fileDialog.ClearSelected();
    }
    if (playback->IsStopped() && !stopped) {
        // Update the window title to reflect that no file is playing.
        SetWindowTitle(NAME);
    }
}
void MainLoop::Deinit() {
    delete playback;

    {
        Json::Value config;
        std::ofstream stream;
        stream.open(path(prefPath) / "config.json");
        path themePath(theme->file_path);
        themePath = themePath.filename();
        if (!themePath.empty()) {
            config["theme_name"] = themePath.filename().string();
        }
        config["accent_color"] = accent_color;
        config["demo_window"] = show_demo_window;
        config["vsync"] = vsync;
        config["framerate"] = framerate;
        if (lang == DEFAULT_LANG) {
            config["lang"] = Json::Value::nullSingleton();
        } else {
            config["lang"] = lang;
        }
        stream << config;
        stream.close();
    }
}
MainLoop::MainLoop() : RendererBackend() {

}
// Main code
int main(int, char**)
{
    MainLoop loop;
    return loop.Run();
}