#include <hex/helpers/http_requests.hpp>
#include <hex/helpers/fmt.hpp>
#include <hex/helpers/literals.hpp>
#include <hex/helpers/fs.hpp>
#include <hex/api/localization_manager.hpp>

#include <algorithm>

#include <imgui.h>

#include <hex/ui/imgui_imhex_extensions.h>
#include <content/popups/popup_notification.hpp>

#include <wolv/io/file.hpp>
#include <wolv/utils/guards.hpp>

namespace hex::plugin::builtin {
    namespace impl {
        using namespace hex::literals;

        void drawFileToolSplitter() {
            std::array sizeText = {
                static_cast<const char*>("hex.builtin.tools.file_tools.splitter.sizes.5_75_floppy"_lang),
                static_cast<const char*>("hex.builtin.tools.file_tools.splitter.sizes.3_5_floppy"_lang),
                static_cast<const char*>("hex.builtin.tools.file_tools.splitter.sizes.zip100"_lang),
                static_cast<const char*>("hex.builtin.tools.file_tools.splitter.sizes.zip200"_lang),
                static_cast<const char*>("hex.builtin.tools.file_tools.splitter.sizes.cdrom650"_lang),
                static_cast<const char*>("hex.builtin.tools.file_tools.splitter.sizes.cdrom700"_lang),
                static_cast<const char*>("hex.builtin.tools.file_tools.splitter.sizes.fat32"_lang),
                static_cast<const char*>("hex.builtin.tools.file_tools.splitter.sizes.custom"_lang)
            };
            std::array<u64, sizeText.size()> sizes = {
                1200_KiB,
                1400_KiB,
                100_MiB,
                200_MiB,
                650_MiB,
                700_MiB,
                4_GiB,
                1
            };

            static std::u8string selectedFile;
            static std::u8string baseOutputPath;
            static u64 splitSize = sizes[0];
            static int selectedItem = 0;
            static TaskHolder splitterTask;

            if (ImGui::BeginChild("split_settings", { 0, ImGui::GetTextLineHeightWithSpacing() * 7 }, true, ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse)) {
                ImGui::BeginDisabled(splitterTask.isRunning());
                {
                    ImGui::InputText("##path", selectedFile);
                    ImGui::SameLine();
                    if (ImGui::Button("...##input")) {
                        fs::openFileBrowser(fs::DialogMode::Open, {}, [](const auto &path) {
                            selectedFile = path.u8string();
                        });
                    }
                    ImGui::SameLine();
                    ImGui::TextUnformatted("hex.builtin.tools.file_tools.splitter.input"_lang);

                    ImGui::InputText("##base_path", baseOutputPath);
                    ImGui::SameLine();
                    if (ImGui::Button("...##output")) {
                        fs::openFileBrowser(fs::DialogMode::Save, {}, [](const auto &path) {
                            baseOutputPath = path.u8string();
                        });
                    }
                    ImGui::SameLine();
                    ImGui::TextUnformatted("hex.builtin.tools.file_tools.splitter.output"_lang);

                    ImGui::Separator();

                    if (ImGui::Combo("###part_size", &selectedItem, sizeText.data(), sizeText.size())) {
                        splitSize = sizes[selectedItem];
                    }
                }
                ImGui::EndDisabled();
                ImGui::BeginDisabled(splitterTask.isRunning() || selectedItem != sizes.size() - 1);
                {
                    ImGui::InputScalar("###custom_size", ImGuiDataType_U64, &splitSize);
                    ImGui::SameLine();
                    ImGui::TextUnformatted("Bytes");
                }
                ImGui::EndDisabled();
            }
            ImGui::EndChild();

            ImGui::BeginDisabled(selectedFile.empty() || baseOutputPath.empty() || splitSize == 0);
            {
                if (splitterTask.isRunning())
                    ImGuiExt::TextSpinner("hex.builtin.tools.file_tools.splitter.picker.splitting"_lang);
                else {
                    if (ImGui::Button("hex.builtin.tools.file_tools.splitter.picker.split"_lang)) {
                        splitterTask = TaskManager::createTask("hex.builtin.tools.file_tools.splitter.picker.splitting", 0, [](auto &task) {
                            ON_SCOPE_EXIT {
                                selectedFile.clear();
                                baseOutputPath.clear();
                            };

                            wolv::io::File file(selectedFile, wolv::io::File::Mode::Read);

                            if (!file.isValid()) {
                                PopupError::open("hex.builtin.tools.file_tools.splitter.picker.error.open"_lang);
                                return;
                            }

                            if (file.getSize() < splitSize) {
                                PopupError::open("hex.builtin.tools.file_tools.splitter.picker.error.size"_lang);
                                return;
                            }

                            task.setMaxValue(file.getSize());

                            u32 index = 1;
                            for (u64 offset = 0; offset < file.getSize(); offset += splitSize) {
                                task.update(offset);

                                std::fs::path path = baseOutputPath;
                                path += hex::format(".{:05}", index);

                                wolv::io::File partFile(path, wolv::io::File::Mode::Create);

                                if (!partFile.isValid()) {
                                    PopupError::open(hex::format("hex.builtin.tools.file_tools.splitter.picker.error.create"_lang, index));
                                    return;
                                }

                                constexpr static auto BufferSize = 0xFF'FFFF;
                                for (u64 partOffset = 0; partOffset < splitSize; partOffset += BufferSize) {
                                    partFile.writeVector(file.readVector(std::min<u64>(BufferSize, splitSize - partOffset)));
                                    partFile.flush();
                                }

                                index++;
                            }

                            PopupInfo::open("hex.builtin.tools.file_tools.splitter.picker.success"_lang);
                        });
                    }
                }
            }
            ImGui::EndDisabled();
        }
    }
}