/*
 * SPDX-License-Identifier: LGPL-2.0-or-later
 *
 * The Ollie command-palette plugin for Kate / KTextEditor.
 *
 * OlliePlugin is the KTextEditor::Plugin entry point. For every MainWindow the
 * host creates an OllieView, which registers the "Command Palette (M-x)" action
 * (Alt+X) and, when triggered, gathers every QAction currently exposed by the
 * window's GUI clients into a PaletteWidget for orderless fuzzy selection.
 */
#ifndef KATECUSTOM_OLLIEPLUGIN_H
#define KATECUSTOM_OLLIEPLUGIN_H

#include <KTextEditor/Plugin>

#include "frecencystore.h"
#include "kateprojectbridge.h"
#include "projectindexer.h"
#include "palettemodel.h" // PaletteItem
#include "plumber.h"
#include "sampanel.h"
#include "waylandcursorwarp.h"

#include <QObject>
#include <QPointer>
#include <QHash>
#include <QList>

class QAction;
class QKeyEvent;

namespace KTextEditor
{
class MainWindow;
class View;
class Document;
}

namespace katecustom
{

class PaletteWidget;
class RadialMenu;
class OllieCommands;
struct RadialDef;

class OlliePlugin : public KTextEditor::Plugin
{
    Q_OBJECT

public:
    explicit OlliePlugin(QObject *parent, const QVariantList &args = {});
    ~OlliePlugin() override;

    QObject *createView(KTextEditor::MainWindow *mainWindow) override;

private:
    OllieCommands *m_commands = nullptr; // ":"-verb pack, registered once globally
};

class OllieView : public QObject
{
    Q_OBJECT

public:
    OllieView(OlliePlugin *plugin, KTextEditor::MainWindow *mainWindow);
    ~OllieView() override;

private Q_SLOTS:
    void showCommandPalette();
    void runAction(const QString &actionId);
    void showFileSwitcher();
    void openProjectFile(const QString &relativePath);
    void showSymbolSwitcher();
    void goToSymbol(const QString &locationId);

    // Plumb the text under the caret (or the current selection) through the
    // plan9 plumber. Bound to F2 for testing.
    void plumbAtCursor();
    // A plumb message arrived on the edit port: open \a file and jump to \a
    // addr (a plan9 edit-port address). Routed from the Plumber reader thread.
    void onPlumbEdit(const QString &file, const QString &addr, const QString &wdir);

    // Run a sam program from the panel. Dispatches to the multi-file X/Y driver
    // when the program begins with X or Y, else runs against the active doc.
    void runSamProgram(const QString &program);

private:
    // Record one activation of \a id and persist. Feeds the frecency bonus so
    // habitual choices float up in every palette.
    void recordUsage(const QString &id);

    // The effective project root: Kate's loaded project (via the bridge) when
    // available, otherwise derived from the active document's directory.
    QString currentProjectRoot() const;
    // Directory of the active document, or empty when none/untitled.
    QString activeDocumentDir() const;

    // Build palette items from raw index results (shared by the cache-hit and
    // async-arrival paths). Root is used to project-qualify the frecency key.
    QList<PaletteItem> buildFileItems(const QString &root, const QStringList &files) const;
    QList<PaletteItem> buildSymbolItems(const QString &root, const QList<Symbol> &symbols) const;

    // Size and place a palette: it spans the active window's width (minus a
    // small margin), anchored near the top.
    void positionPalette(PaletteWidget *palette);

    // Move the OS pointer onto the center of the active view — used after a
    // radial pane-focus action so the mouse follows the keyboard focus.
    void warpCursorToActiveView();
    // One harvested, runnable action with the provenance needed to build a
    // unique id and to disambiguate labels shared by several commands.
    struct ActionEntry {
        QPointer<QAction> action;
        QString label;      // visible text, ampersands stripped
        QString component;  // owning collection's display name (provenance)
        QString shortcut;   // current shortcut, native text
        QString id;         // unique, stable key used on activation
    };

    // Collect every unique, enabled, visible QAction reachable from the
    // window's GUI factory clients, deduplicated by pointer identity.
    QList<ActionEntry> collectActions() const;

    // Find a Kate action by its raw objectName across all GUI clients. Used to
    // resolve radial-menu slice ids (which reference Kate action names).
    QAction *findActionByName(const QString &objectName) const;

    // Build the configured radials and bind each to its trigger key.
    void setupRadials();
    void showRadial(int defIndex);              // centre on the caret
    void showRadialAt(int defIndex, const QPoint &globalPos); // centre on a point
    void onRadialActivated(const QString &actionId);

    // Acme-style line-editing keys, handled in the event filter (no QActions,
    // so there is nothing for Qt to report as an ambiguous shortcut).
    void acmeBeginningOfLine(); // C-a
    void acmeEndOfLine();       // C-e
    void acmeEraseChar();       // C-h
    void acmeEraseLine();       // C-u
    void acmeEraseWord();       // C-w
    // Dispatch an Acme key combo. Returns true if it was one of ours.
    bool dispatchAcmeKey(QKeyEvent *ke);

    // Catches configured mouse-button gestures inside the active view.
    bool eventFilter(QObject *obj, QEvent *event) override;

    // On double-click adjacent to a bracket, select the text between the
    // matching pair (multi-line aware). Returns true if a pair was selected.
    bool selectBracketPairAt(KTextEditor::View *view, const QPoint &globalPos);

    // Apply a sam program to a single document, returning the engine result.
    // Edits are applied inside one EditingTransaction (a single undo step).
    // \a doc must be non-null. Does not touch the panel.
    bool applySamToDocument(KTextEditor::Document *doc, const QString &program,
                            int dotStart, int dotEnd, QString *output, QString *error);

    // Drive a multi-file X/Y sweep over the project's files, opening each match
    // and applying \a inner. Reports progress/errors to the panel.
    void runSamFileLoop(bool negate, const QString &fileRegex, const QString &inner);

    KTextEditor::MainWindow *m_mainWindow;
    PaletteWidget *m_palette = nullptr;
    PaletteWidget *m_filePalette = nullptr; // project "Go to File" switcher
    QString m_fileSwitcherRoot;             // project root for the open switcher
    PaletteWidget *m_symbolPalette = nullptr; // project "Go to Symbol" switcher
    QString m_symbolSwitcherRoot;             // project root for the symbol switcher
    RadialMenu *m_radial = nullptr;
    QList<RadialDef> m_radialDefs;
    QHash<int, int> m_buttonToRadial; // Qt::MouseButton (int) -> def index
    bool m_gestureActive = false;     // an RMB drag gesture is in progress
    bool m_leftDownInView = false;    // LMB held inside the view (Acme chord anchor)
    bool m_swallowMiddleRelease = false; // swallow the release paired with a consumed middle press
    bool m_swallowRightRelease = false;  // swallow the release paired with a left+right paste chord
    QHash<QString, QPointer<QAction>> m_actionsById;
    FrecencyStore m_frecency; // persisted usage feeding the palette ranking
    KateProjectBridge m_projectBridge; // read-only view of Kate's project plugin
    ProjectIndexer m_indexer; // async, cached file/symbol indexing
    WaylandCursorWarp m_cursorWarp; // pointer warp on Wayland (no-op on X11)
    Plumber m_plumber; // plan9 plumbing client (send + edit-port reader)
    SamPanel *m_samPanel = nullptr; // sam command tool view (owned by the host)
    QWidget *m_samToolView = nullptr; // the dockable container from createToolView
};

} // namespace katecustom

#endif