#ifndef CODEEDITOR_H
#define CODEEDITOR_H

#include "executor.h"
#include "Utils/systemapi.h"
#include <QLabel>
#include <QLineEdit>
#include <QWidget>
#include "cmdlistwidget.h"
#include "Utils/cacheiconprovider.h"
#include <QCompleter>
#include "Utils/request.h"
struct PastCodeList {
    PastCodeList()
        : lineLimit(10), index(0) {}
    explicit PastCodeList(int LineLimit)
        : lineLimit(LineLimit), index(0) {}
    void setLineLimit(int LineLimit) { lineLimit = LineLimit; }
    PastCodeList& operator<<(const QString& str)
    {
        if (list.empty() || list.back() != str) { //短路求值保证list有效访问
            if (list.size() >= lineLimit) list.removeFirst();
            list << str;
        }
        index = list.size();
        return *this;
    }
    QString past(void)
    {
        index--;
        fixIndex();
        if (!isValid(index)) return "";
        return list.at(index);
    }
    QString next(void)
    {
        index++;
        fixIndex();
        if (!isValid(index)) return "";
        return list.at(index);
    }
    bool isValid(int Index)
    {
        if (Index < 0 || list.empty()) return false;
        return Index < list.size();
    }
    void fixIndex(void)
    {
        if (index < 0) index = 0;
        if (index >= list.size()) index = list.size() > 0 ? list.size() - 1 : 0;
    }

private:
    QStringList list;
    int lineLimit;
    int index;
};

class Widget;
class CodeEditor : public QLineEdit
{
    Q_OBJECT

    using IconStrList = CMDListWidget::IconStrList;

public:
    explicit CodeEditor(int width, int height, QWidget* parent = nullptr);
    friend class Widget;
signals:
    //只报告自身内部Size，不理睬主窗体Margin(所谓，两耳不闻窗外事)
    void reportResize(int width, int height); //-1 means Automatic
    void returnWithoutEcho(bool noHide = false); //按下回车，且无回显的Text

private:
    Executor executor;
    QLabel* label = nullptr;
    CMDListWidget* lw = nullptr;
    //QFileIconProvider iconPro;
    CacheIconProvider& iconPro = CacheIconProvider::instance();
    QCompleter* comp = nullptr;
    Request request;
    //QClipboard* clipboard;

    const int normalWidth; //LineEditor宽度
    const int normalHeight;
    const int Margin = DPI(5); //内部Margin，与主窗体无关
    const int TextLimit = 128;
    const QString Holder_note = "#note?";

    PastCodeList pastCodeList { 10 }; //code历史记录//不能用()存在歧义(函数声明or变量声明)

    QAction* act_admin = nullptr;
    const QString BasicQss{ "QLineEdit{background-color:rgb(15,15,15);color:rgb(225,225,225);font-family:Consolas;font-size:14pt}" };

    // QWidget interface
protected:
    void hideEvent(QHideEvent* event) override;
    void showEvent(QShowEvent* event) override;
    void focusInEvent(QFocusEvent* event) override;
    void resizeEvent(QResizeEvent* event) override;
    void keyPressEvent(QKeyEvent* event) override;
    void keyReleaseEvent(QKeyEvent* event) override;
    void wheelEvent(QWheelEvent* event) override;

private:
    void showLabel(const QString& text);
    void hideLabel(bool isAdjustSize = true);
    void showList(const IconStrList& list);
    void hideList(bool isAdjustSize = true);
    void hideDisplay(void); //list && label
    void textEdit(const QString& text);
    void adjustWholeSize(const QString& str = QString());
    void returnPress(void);

public:
    void silent(void);
    void wake(const QString& placeHolder = "");
};

#endif // CODEEDITOR_H