9 files changed, 504 insertions, 49 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dfb9afb..bbcbf38 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,15 +12,16 @@ set(CXX_CPPCHECK "project=build/compile_commands.json;enable=information;force")
 set(CMAKE_EXPORT_COMPILE_COMMANDS true)
 
 qt_add_executable(getsuyomi
-    # main_window.ui
     src/main_window.cpp
     src/main.cpp
+    src/archive.cpp
+    src/getsuyomi.cpp
 )
 
 # find_dependency(minizip-ng REQUIRED)
 
-target_include_directories(getsuyomi PRIVATE minizip-ng)
-target_link_libraries(getsuyomi PRIVATE Qt6::Widgets minizip-ng)
+target_include_directories(getsuyomi PRIVATE libzip)
+target_link_libraries(getsuyomi PRIVATE Qt6::Widgets zip)
 
 # set_target_properties(getsuyomi PROPERTIES
 #     WIN32_EXECUTABLE ON
diff --git a/src/archive.cpp b/src/archive.cpp
new file mode 100644
index 0000000..0339d85
--- /dev/null
+++ b/src/archive.cpp
@@ -0,0 +1,136 @@
+#include "archive.hpp"
+
+#include "main_window.hpp"
+
+#include <algorithm>
+
+namespace getsuyomi {
+
+ZipArchive::ZipArchive(const QString& filename)
+{
+    auto filenameUtf8 = filename.toUtf8();
+    qDebug("Open file %s", filenameUtf8.data());
+    int err;
+    m_archive = zip_open(filenameUtf8.data(), 0, &err);
+    if (m_archive == nullptr) {
+        zip_error_t error;
+        zip_error_init_with_code(&error, err);
+        qCritical("%s: cannot open zip archive '%s': %s", AppName, filenameUtf8.data(), zip_error_strerror(&error));
+        zip_error_fini(&error);
+        throw std::runtime_error("Bad zip file");
+    }
+
+    populate();
+}
+
+void ZipArchive::populate()
+{
+    auto numEntries = zip_get_num_entries(m_archive, ZIP_FL_UNCHANGED);
+    qDebug("%zu pages", numEntries);
+
+    struct NameIndex {
+        std::string name;
+        size_t index;
+        size_t filesize;
+    };
+
+    std::vector<NameIndex> nameIndices{};
+    nameIndices.reserve(numEntries);
+    m_pages.reserve(numEntries);
+
+    for (size_t idx = 0; idx < numEntries; ++idx) {
+        struct zip_stat stats;
+
+        auto status = zip_stat_index(m_archive, idx, 0, &stats);
+        static_assert(ZIP_STAT_NAME != 0);
+        static_assert(ZIP_STAT_SIZE != 0);
+        static_assert(ZIP_STAT_INDEX != 0);
+        // auto* nameCString = zip_get_name(m_archive, idx, ZIP_FL_ENC_RAW);
+        auto* nameCString = stats.name;
+        if (nameCString == nullptr) {
+            zip_error_t* error = zip_get_error(m_archive);
+            qWarning("cannot get name %s", zip_error_strerror(error));
+            continue;
+        }
+        std::string name{nameCString};
+        if (name.empty() || name.back() == '/') {
+            qDebug("Directory %s", name.empty() ? "N/A" : nameCString);
+            continue;
+        }
+
+        nameIndices.emplace_back(NameIndex{name, idx, stats.size});
+        m_pages.emplace_back(std::nullopt);
+    }
+
+    std::sort(nameIndices.begin(), nameIndices.end(), [](const auto& lhs, const auto& rhs) {
+        return std::lexicographical_compare(lhs.name.begin(), lhs.name.end(), rhs.name.begin(), rhs.name.end());
+    });
+
+    m_sortedIndices.reserve(nameIndices.size());
+    m_filenames.reserve(nameIndices.size());
+    m_fileSizes.reserve(nameIndices.size());
+
+    for (const auto& nameIndex : nameIndices) {
+        m_sortedIndices.push_back(nameIndex.index);
+        m_filenames.push_back(nameIndex.name);
+        m_fileSizes.push_back(nameIndex.filesize);
+    }
+}
+
+ZipArchive::~ZipArchive()
+{
+    if (m_archive != nullptr) {
+        zip_discard(m_archive);
+        m_archive = nullptr;
+    }
+}
+
+ArchiveResult ZipArchive::getPage(size_t page)
+{
+    qDebug("Getting page %zu", page);
+    if (page > m_sortedIndices.size()) {
+        return ArchiveResult::error(ArchiveError::BadIndex);
+    }
+
+    if (m_pages[page] != std::nullopt) {
+        qDebug("Page found %zu", page);
+        return ArchiveResult::okay(std::cref(*m_pages[page]));
+    }
+
+    auto* file = zip_fopen_index(m_archive, m_sortedIndices[page], 0);
+    if (file == nullptr) {
+        zip_error_t* error = zip_get_error(m_archive);
+        qWarning("cannot get file name %s: %s", m_filenames[page].data(), zip_error_strerror(error));
+        return ArchiveResult::error(ArchiveError::ZipError);
+    }
+
+    QByteArray data;
+    data.resize(m_fileSizes[page]);
+    auto index = m_sortedIndices[page];
+
+    qDebug("Reading in page data");
+    auto bytesRead = zip_fread(file, data.data(), data.size());
+    zip_fclose(file);
+    file = nullptr;
+
+    if (bytesRead != data.size()) {
+        return ArchiveResult::error(ArchiveError::ZipError);
+    }
+
+    m_pages[page] = QImage();
+    qDebug("Loading QImage from page data");
+    auto loaded = m_pages[page]->loadFromData(data);
+    if (!loaded) {
+        qWarning("Failed to load QImage");
+        m_pages[page] = std::nullopt;
+        return ArchiveResult::error(ArchiveError::BadData);
+    }
+
+    return ArchiveResult::okay(std::cref(*m_pages[page]));
+}
+
+size_t ZipArchive::numPages() const {
+    return m_pages.size();
+}
+
+} // namespace getsuyomi
diff --git a/src/archive.hpp b/src/archive.hpp
new file mode 100644
index 0000000..d8464e5
--- /dev/null
+++ b/src/archive.hpp
@@ -0,0 +1,52 @@
+#ifndef ARCHIVE_HPP
+#define ARCHIVE_HPP
+
+#include "result.hpp"
+
+#include <QtWidgets>
+#include <cstdlib>
+#include <string>
+#include <vector>
+#include <zip.h>
+
+namespace getsuyomi {
+
+enum class ArchiveError
+{
+    BadIndex,
+    ZipError,
+    BadData,
+    Unimplemented
+};
+
+using ArchiveResult = Result<std::reference_wrapper<const QImage>, ArchiveError>;
+
+class Archive {
+  public:
+    virtual ~Archive() = default;
+    virtual ArchiveResult getPage(size_t page) = 0;
+    virtual size_t numPages() const = 0;
+};
+
+class ZipArchive : public Archive {
+  public:
+    explicit ZipArchive(const QString& filename);
+    virtual ~ZipArchive() override;
+    virtual ArchiveResult getPage(size_t page) override;
+    virtual size_t numPages() const override;
+
+  private:
+    void populate();
+
+    zip_t* m_archive{nullptr};
+
+    std::vector<size_t> m_sortedIndices{};
+    std::vector<std::string> m_filenames{};
+    std::vector<size_t> m_fileSizes{};
+
+    std::vector<std::optional<QImage>> m_pages{};
+};
+
+} // namespace getsuyomi
+
+#endif
diff --git a/src/getsuyomi.cpp b/src/getsuyomi.cpp
new file mode 100644
index 0000000..11f273b
--- /dev/null
+++ b/src/getsuyomi.cpp
@@ -0,0 +1,106 @@
+#include "getsuyomi.hpp"
+#include "main_window.hpp"
+
+namespace getsuyomi {
+
+Getsuyomi::Getsuyomi()
+{
+    m_layout = new QVBoxLayout();
+
+    m_layout->addWidget(&m_pageLeft);
+    m_layout->addWidget(&m_pageRight);
+
+    setLayout(m_layout);
+}
+
+void Getsuyomi::setArchive(Archive* archive) {
+    if (archive == m_archive) {
+        return;
+    }
+    delete(m_archive);
+    m_archive = archive;
+    m_pageNumber = 0;
+    setPages();
+}
+
+void Getsuyomi::next() {
+    auto numPages = m_archive->numPages();
+    size_t increment = 1;
+    if (m_pageLayout != PageLayout::Single) {
+        increment = 2;
+    }
+    if ((m_pageNumber + increment) >= numPages)
+    {
+        return;
+    }
+    m_pageNumber += increment;
+    setPages();
+}
+
+void Getsuyomi::back() {
+    auto numPages = m_archive->numPages();
+    size_t decrement = 1;
+    if (m_pageLayout != PageLayout::Single) {
+        decrement = 2;
+    }
+    if (m_pageNumber < decrement)
+    {
+        m_pageNumber = 0;
+        decrement = 0;
+    }
+    m_pageNumber -= decrement;
+    setPages();
+}
+
+void Getsuyomi::setPages() {
+    m_pageLeft.setPixmap(QPixmap());
+    m_pageRight.setPixmap(QPixmap());
+
+    switch (m_pageLayout)
+    {
+    case PageLayout::Dual:
+        return setPagesDual();
+    case PageLayout::Manga:
+        return setPagesManga();
+    case PageLayout::Single:
+    default:
+        return setPagesNormal();
+    }
+}
+
+void Getsuyomi::setPagesNormal() {
+    auto page1 = m_archive->getPage(m_pageNumber);
+    auto& label1 = m_pageLeft;
+
+    if (page1.isOkay()) {
+        label1.setPixmap(QPixmap::fromImage(page1.getOkay()));
+    }
+}
+
+void Getsuyomi::setPagesDual() {
+    auto& label1 = m_pageLeft;
+    auto& label2 = m_pageRight;
+    setPages(label1, label2);
+}
+
+void Getsuyomi::setPagesManga() {
+    auto& label1 = m_pageRight;
+    auto& label2 = m_pageLeft;
+    setPages(label1, label2);
+}
+
+void Getsuyomi::setPages(QLabel& label1, QLabel& label2) {
+    auto page1 = m_archive->getPage(m_pageNumber);
+    auto page2 = m_archive->getPage(m_pageNumber + 1);
+
+    if (page1.isOkay()) {
+        label1.setPixmap(QPixmap::fromImage(page1.getOkay()));
+    }
+
+
+    if (page2.isOkay()) {
+        label2.setPixmap(QPixmap::fromImage(page1.getOkay()));
+    }
+}
+
+} // namespace getsuyomi
diff --git a/src/getsuyomi.hpp b/src/getsuyomi.hpp
new file mode 100644
index 0000000..3d3c092
--- /dev/null
+++ b/src/getsuyomi.hpp
@@ -0,0 +1,51 @@
+#ifndef GETSUYOMI_HPP
+#define GETSUYOMI_HPP
+
+#include "archive.hpp"
+
+#include <QtWidgets>
+#include <cstdint>
+#include <vector>
+
+namespace getsuyomi {
+
+enum class PageLayout : uint8_t {
+    Single,
+    Dual,
+    Manga
+};
+
+class Getsuyomi : public QWidget {
+    Q_OBJECT
+
+  public:
+    friend class GetsuyomiApp;
+    Getsuyomi();
+
+  public slots:
+    void setArchive(Archive* archive);
+    void next();
+    void back();
+
+  private:
+    void setPages();
+    void setPagesNormal();
+    void setPagesDual();
+    void setPagesManga();
+    void setPages(QLabel& label1, QLabel& label2);
+
+    QLayout* m_layout{nullptr};
+
+    Archive* m_archive{nullptr};
+
+    PageLayout m_pageLayout{PageLayout::Single};
+
+    QLabel m_pageLeft{};
+    QLabel m_pageRight{};
+
+    size_t m_pageNumber{0};
+};
+
+} // namespace getsuyomi
+
+#endif
diff --git a/src/main.cpp b/src/main.cpp
index 9a57bfc..bac3ff2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3,7 +3,7 @@
 int main(int argc, char* argv[])
 {
     QApplication app{argc, argv};
-    getsuyomi::GetsuyomiApp getsuyobi{};
+    getsuyomi::GetsuyomiApp getsuyomi{};
 
     QCommandLineParser parser;
     parser.setApplicationDescription(QApplication::translate("main", "A comic book and manga reader"));
diff --git a/src/main_window.cpp b/src/main_window.cpp
index 61b3b65..b05507c 100644
--- a/src/main_window.cpp
+++ b/src/main_window.cpp
@@ -1,9 +1,7 @@
 #include "main_window.hpp"
 
 #include <QString>
-#include <minizip-ng/mz.h>
-#include <minizip-ng/mz_strm_buf.h>
-#include <minizip-ng/mz_strm_os.h>
+#include <zip.h>
 
 namespace getsuyomi {
 
@@ -15,13 +13,18 @@ GetsuyomiApp::GetsuyomiApp() : m_getsuyomi{new Getsuyomi()}
 
 void GetsuyomiApp::setup()
 {
-    createActions();
-    createMenus();
-
     QCoreApplication::setApplicationName(AppName);
     QCoreApplication::setApplicationVersion(AppVersionString);
     setWindowTitle(AppName);
 
+    createActions();
+    createMenus();
+    createToolBar();
+
+    constexpr int minimumWidth = 640;
+    constexpr int minimumHeight = 480;
+    setMinimumSize(minimumWidth, minimumHeight);
+
     show();
 }
 
@@ -41,14 +44,39 @@ void GetsuyomiApp::createActions()
     m_quitAction->setShortcuts(QKeySequence::Quit);
     m_quitAction->setStatusTip(tr("Quit"));
     connect(m_quitAction, &QAction::triggered, this, &GetsuyomiApp::quit);
+
+    auto nextShortcuts = QList<QKeySequence>{};
+    nextShortcuts.append(QKeySequence{Qt::Key_L});
+    nextShortcuts.append(QKeySequence{Qt::Key_Right});
+    nextShortcuts.append(QKeySequence{Qt::Key_Down});
+    m_nextAction = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::GoNext), tr("Next"), this);
+    m_nextAction->setShortcuts(nextShortcuts);
+    m_nextAction->setStatusTip(tr("Next"));
+    connect(m_nextAction, &QAction::triggered, this, &GetsuyomiApp::next);
+
+    auto backShortcuts = QList<QKeySequence>{};
+    backShortcuts.append(QKeySequence{Qt::Key_H});
+    backShortcuts.append(QKeySequence{Qt::Key_Left});
+    backShortcuts.append(QKeySequence{Qt::Key_Up});
+    m_backAction = new QAction(QIcon::fromTheme(QIcon::ThemeIcon::GoPrevious), tr("Back"), this);
+    m_backAction->setShortcuts(backShortcuts);
+    m_backAction->setStatusTip(tr("Back"));
+    connect(m_backAction, &QAction::triggered, this, &GetsuyomiApp::back);
 }
 
 void GetsuyomiApp::createMenus()
 {
-    m_fileMenu = menuBar()->addMenu(tr("&File"));
-    m_fileMenu->addAction(m_openFile);
-    m_fileMenu->addAction(m_openDirectory);
-    m_fileMenu->addAction(m_quitAction);
+    m_menuBar = menuBar()->addMenu(tr("&File"));
+    m_menuBar->addAction(m_openFile);
+    m_menuBar->addAction(m_openDirectory);
+    m_menuBar->addAction(m_quitAction);
+}
+
+void GetsuyomiApp::createToolBar()
+{
+    m_toolBar = addToolBar(tr("&Navigation"));
+    m_toolBar->addAction(m_backAction);
+    m_toolBar->addAction(m_nextAction);
 }
 
 void GetsuyomiApp::openFile()
@@ -58,7 +86,17 @@ void GetsuyomiApp::openFile()
         tr("Open Archive"),
         QDir::homePath(),
         tr("Archive types (*.zip *.cbz *.cbr *.gz)"));
-    qDebug("Open file %s\n", qPrintable(filename));
+
+    if (filename.endsWith(".zip")) {
+        try {
+            auto* archive = new ZipArchive(filename);
+            m_getsuyomi->setArchive(archive);
+        } catch (std::runtime_error& exc) {
+            qCritical("Failed to change archive");
+        }
+    } else {
+        qCritical("Unsupported file extension");
+    }
 }
 
 void GetsuyomiApp::openDirectory()
@@ -69,38 +107,23 @@ void GetsuyomiApp::openDirectory()
         QDir::homePath(),
         QFileDialog::ShowDirsOnly | QFileDialog::DontResolveSymlinks);
     qDebug("Open directory %s", qPrintable(directory));
-
-    auto* stream = mz_stream_os_create();
-    if (stream == nullptr) {
-        qCritical("Nullpointer - stream");
-        return;
-    }
-
-    auto* bufStream = mz_stream_buffered_create();
-    if (stream == nullptr) {
-        qCritical("Nullpointer - bufStream");
-        return;
-    }
-
-    mz_stream_buffered_open(bufStream, nullptr, MZ_OPEN_MODE_READ);
-    mz_stream_buffered_set_base(bufStream, stream);
-
 }
 
 void GetsuyomiApp::quit()
 {
-    printf("Quit!\n");
     QCoreApplication::quit();
 }
 
-Getsuyomi::Getsuyomi()
+void GetsuyomiApp::next()
 {
-    m_layout = new QVBoxLayout();
-
-    auto* label = new QLabel(AppName);
-    m_layout->addWidget(label);
+    qDebug("Next");
+    m_getsuyomi->next();
+}
 
-    setLayout(m_layout);
+void GetsuyomiApp::back()
+{
+    qDebug("Back");
+    m_getsuyomi->back();
 }
 
 } // namespace getsuyomi
diff --git a/src/main_window.hpp b/src/main_window.hpp
index 886ba42..bc23b01 100644
--- a/src/main_window.hpp
+++ b/src/main_window.hpp
@@ -1,3 +1,9 @@
+#ifndef MAIN_WINDOW_HPP
+#define MAIN_WINDOW_HPP
+
+#include "archive.hpp"
+#include "getsuyomi.hpp"
+
 #include <QtWidgets>
 
 namespace getsuyomi {
@@ -5,8 +11,6 @@ namespace getsuyomi {
 constexpr const char* AppName = "GetsuYomi";
 constexpr const char* AppVersionString = "1.0.0";
 
-class Getsuyomi;
-
 class GetsuyomiApp : public QMainWindow {
     Q_OBJECT
 
@@ -17,28 +21,28 @@ class GetsuyomiApp : public QMainWindow {
     void setup();
     void createActions();
     void createMenus();
+    void createToolBar();
 
     Getsuyomi* m_getsuyomi;
 
     QAction* m_openFile;
     QAction* m_openDirectory;
     QAction* m_quitAction;
+    QAction* m_nextAction;
+    QAction* m_backAction;
 
-    QMenu* m_fileMenu;
+    QMenu* m_menuBar;
+    QToolBar* m_toolBar;
 
   private slots:
     void openFile();
     void openDirectory();
     void quit();
-};
 
-class Getsuyomi : public QWidget {
-    Q_OBJECT
-  public:
-    Getsuyomi();
-
-  private:
-    QLayout* m_layout{nullptr};
+    void next();
+    void back();
 };
 
 } // namespace getsuyomi
+
+#endif
diff --git a/src/result.hpp b/src/result.hpp
new file mode 100644
index 0000000..6bb8971
--- /dev/null
+++ b/src/result.hpp
@@ -0,0 +1,82 @@
+/*
+ * ExtLib
+ * Copyright 2024 Dominick Allen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef GETSUYOMI_RESULT_HPP
+#define GETSUYOMI_RESULT_HPP
+
+#include <variant>
+
+namespace getsuyomi {
+
+template<typename T, typename E>
+class Result {
+public:
+    using ResultType = Result<T, E>;
+    static ResultType okay(const T& okay)
+    {
+        return ResultType{okay};
+    }
+
+    static ResultType okay(T&& okay)
+    {
+        return ResultType{std::move(okay)};
+    }
+
+    static ResultType error(const E& error)
+    {
+        return ResultType{error};
+    }
+
+    static ResultType error(E&& error)
+    {
+        return ResultType{std::move(error)};
+    }
+
+    [[nodiscard]] constexpr bool isOkay() const
+    {
+        return(m_value.index() == 0);
+    }
+
+    [[nodiscard]] constexpr bool isError() const
+    {
+        return(m_value.index() == 1);
+    }
+
+    T getOkay()
+    {
+        return std::get<T>(m_value);
+    }
+
+    E getError()
+    {
+        return std::get<E>(m_value);
+    }
+
+private:
+    explicit Result() : m_value() {}
+    explicit Result(const T& value) : m_value(value) {}
+    explicit Result(const E& value) : m_value(value) {}
+
+    explicit Result(T&& value) : m_value(std::move(value)) {}
+    explicit Result(E&& value) : m_value(std::move(value)) {}
+
+    std::variant<T, E> m_value;
+};
+
+} // namespace getsuyomi
+
+#endif