/*
 * Copyright (c) 2020, the SerenityOS developers.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "Spreadsheet.h"
#include <LibGUI/AbstractTableView.h>
#include <LibGUI/ModelEditingDelegate.h>
#include <LibGUI/Widget.h>
#include <string.h>

namespace Spreadsheet {

class CellEditor final : public GUI::TextEditor {
    C_OBJECT(CellEditor);

public:
    virtual ~CellEditor() { }

    Function<void(GUI::KeyEvent&)> on_cursor_key_pressed;

private:
    CellEditor()
        : TextEditor(TextEditor::Type::SingleLine)
    {
    }

    static bool is_navigation(const GUI::KeyEvent& event)
    {
        if (event.modifiers() == KeyModifier::Mod_Shift && event.key() == KeyCode::Key_Tab)
            return true;

        if (event.modifiers())
            return false;

        switch (event.key()) {
        case KeyCode::Key_Tab:
        case KeyCode::Key_Left:
        case KeyCode::Key_Right:
        case KeyCode::Key_Up:
        case KeyCode::Key_Down:
        case KeyCode::Key_Return:
            return true;
        default:
            return false;
        }
    }

    virtual void keydown_event(GUI::KeyEvent& event) override
    {
        if (is_navigation(event))
            on_cursor_key_pressed(event);
        else
            TextEditor::keydown_event(event);
    }
};

class SpreadsheetView final : public GUI::Widget {
    C_OBJECT(SpreadsheetView);

public:
    ~SpreadsheetView();

    const Sheet& sheet() const { return *m_sheet; }
    Sheet& sheet() { return *m_sheet; }

    Function<void(Vector<Position>&&)> on_selection_changed;
    Function<void()> on_selection_dropped;

private:
    virtual void hide_event(GUI::HideEvent&) override;
    virtual void show_event(GUI::ShowEvent&) override;

    SpreadsheetView(Sheet&);

    class EditingDelegate final : public GUI::StringModelEditingDelegate {
    public:
        EditingDelegate(const Sheet& sheet)
            : m_sheet(sheet)
        {
        }
        virtual void set_value(const GUI::Variant& value) override;

        virtual RefPtr<Widget> create_widget() override
        {
            auto textbox = CellEditor::construct();
            textbox->on_escape_pressed = [this] {
                rollback();
            };
            textbox->on_cursor_key_pressed = [this](auto& event) {
                commit();
                on_cursor_key_pressed(event);
            };
            return textbox;
        }

        Function<void(GUI::KeyEvent&)> on_cursor_key_pressed;

    private:
        bool m_has_set_initial_value { false };
        const Sheet& m_sheet;
    };

    class TableCellPainter final : public GUI::TableCellPaintingDelegate {
    public:
        TableCellPainter(const GUI::TableView& view)
            : m_table_view(view)
        {
        }
        void paint(GUI::Painter&, const Gfx::IntRect&, const Gfx::Palette&, const GUI::ModelIndex&) override;

    private:
        const GUI::TableView& m_table_view;
    };

    NonnullRefPtr<Sheet> m_sheet;
    RefPtr<GUI::TableView> m_table_view;
    RefPtr<GUI::Menu> m_cell_range_context_menu;
};

}

AK_BEGIN_TYPE_TRAITS(Spreadsheet::SpreadsheetView)
static bool is_type(const Core::Object& object) { return !strcmp(object.class_name(), "SpreadsheetView"); }
AK_END_TYPE_TRAITS()