#include "content/views/view_theme_manager.hpp"

#include <hex/api/content_registry.hpp>
#include <hex/api/theme_manager.hpp>

#include <wolv/io/file.hpp>

namespace hex::plugin::builtin {

    ViewThemeManager::ViewThemeManager() : View("hex.builtin.view.theme_manager.name") {
        ContentRegistry::Interface::addMenuItem({ "hex.builtin.menu.extras", "hex.builtin.view.theme_manager.name" }, 2000, Shortcut::None, [&, this] {
            this->m_viewOpen = true;
            this->getWindowOpenState() = true;
        });
    }

    void ViewThemeManager::drawContent() {
        if (ImGui::Begin(View::toWindowName("hex.builtin.view.theme_manager.name").c_str(), &this->m_viewOpen, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoDocking)) {
            ImGui::Header("hex.builtin.view.theme_manager.colors"_lang, true);

            // Draw theme handlers
            ImGui::PushID(1);


            // Loop over each theme handler
            bool anyColorHovered = false;
            for (auto &[name, handler] : ThemeManager::getThemeHandlers()) {
                // Create a new collapsable header for each category
                if (ImGui::CollapsingHeader(name.c_str())) {

                    // Loop over all the individual theme settings
                    for (auto &[colorName, colorId] : handler.colorMap) {
                        // Get the current color value
                        auto color = handler.getFunction(colorId);

                        // Draw a color picker for the color
                        if (ImGui::ColorEdit4(colorName.c_str(), reinterpret_cast<float*>(&color.Value), ImGuiColorEditFlags_NoInputs | ImGuiColorEditFlags_AlphaBar | ImGuiColorEditFlags_AlphaPreviewHalf)) {
                            // Update the color value
                            handler.setFunction(colorId, color);
                            EventManager::post<EventThemeChanged>();
                        }

                        if (ImGui::IsItemHovered()) {
                            anyColorHovered = true;

                            if (!this->m_hoveredColorId.has_value()) {
                                this->m_hoveredColorId      = colorId;
                                this->m_startingColor       = color;
                                this->m_hoveredHandlerName  = name;
                            }
                        }
                    }
                }

                if (this->m_hoveredHandlerName == name && this->m_startingColor.has_value() && this->m_hoveredColorId.has_value()) {
                    auto flashingColor = this->m_startingColor.value();

                    const float flashProgress = std::min(1.0F, (1.0F + sinf(ImGui::GetTime() * 6)) / 2.0F);
                    flashingColor.Value.x = std::lerp(flashingColor.Value.x, 1.0F, flashProgress);
                    flashingColor.Value.y = std::lerp(flashingColor.Value.y, 1.0F, flashProgress);;

                    handler.setFunction(*this->m_hoveredColorId, flashingColor);

                    if (!anyColorHovered) {
                        handler.setFunction(this->m_hoveredColorId.value(), this->m_startingColor.value());
                        this->m_startingColor.reset();
                        this->m_hoveredColorId.reset();
                    }
                }
            }
            ImGui::PopID();


            ImGui::Header("hex.builtin.view.theme_manager.styles"_lang);

            // Draw style handlers
            ImGui::PushID(2);

            // Loop over each style handler
            for (auto &[name, handler] : ThemeManager::getStyleHandlers()) {
                // Create a new collapsable header for each category
                if (ImGui::CollapsingHeader(name.c_str())) {

                    // Loop over all the individual style settings
                    for (auto &[styleName, style] : handler.styleMap) {
                        // Get the current style value
                        auto &[value, min, max, needsScaling] = style;

                        // Styles can either be floats or ImVec2s
                        // Determine which one it is and draw the appropriate slider
                        if (auto floatValue = std::get_if<float*>(&value); floatValue != nullptr) {
                            if (ImGui::SliderFloat(styleName.c_str(), *floatValue, min, max, "%.1f")) {
                                EventManager::post<EventThemeChanged>();
                            }
                        } else if (auto vecValue = std::get_if<ImVec2*>(&value); vecValue != nullptr) {
                            if (ImGui::SliderFloat2(styleName.c_str(), &(*vecValue)->x, min, max, "%.1f")) {
                                EventManager::post<EventThemeChanged>();
                            }
                        }
                    }
                }
            }
            ImGui::PopID();

            // Draw export settings
            ImGui::Header("hex.builtin.view.theme_manager.export"_lang);
            ImGui::InputTextIcon("hex.builtin.view.theme_manager.export.name"_lang, ICON_VS_SYMBOL_KEY, this->m_themeName);

            // Draw the export buttons
            if (ImGui::Button("hex.builtin.view.theme_manager.save_theme"_lang, ImVec2(ImGui::GetContentRegionAvail().x, 0))) {
                fs::openFileBrowser(fs::DialogMode::Save, { { "ImHex Theme", "json" } }, [this](const std::fs::path &path){
                    // Export the current theme as json
                    auto json = ThemeManager::exportCurrentTheme(this->m_themeName);

                    // Write the json to the file
                    wolv::io::File outputFile(path, wolv::io::File::Mode::Create);
                    outputFile.writeString(json.dump(4));
                });
            }

        }
        ImGui::End();

        this->getWindowOpenState() = this->m_viewOpen;
    }

}