/* Роли модели сообщений и отрисовка text/voice/file/image/video, статусов и progress.
 * Рассчитывает геометрию для ChatView и обрабатывает действия по media-элементам строки. */
#pragma once
#include <cstdint>

#include <QStyledItemDelegate>
#include <QPersistentModelIndex>
#include <QVector>
#include <functional>

enum MessageDataRole {
    MsgAuthorRole       = Qt::UserRole + 1,
    MsgTextRole         = Qt::UserRole + 2,
    MsgTimeRole         = Qt::UserRole + 3,
    MsgEditedRole       = Qt::UserRole + 4,
    MsgAvatarRole       = Qt::UserRole + 5,
    MsgHasQuoteRole     = Qt::UserRole + 6,
    MsgQuoteAuthorRole  = Qt::UserRole + 7,
    MsgQuoteTextRole    = Qt::UserRole + 8,
    MsgReactionsRole    = Qt::UserRole + 9,
    MsgIdRole           = Qt::UserRole + 10,
    MsgIsOutgoingRole   = Qt::UserRole + 11,
    MsgContentTypeRole  = Qt::UserRole + 12,
    MsgVoiceDurationRole = Qt::UserRole + 13,
    MsgVoiceFileRole    = Qt::UserRole + 14,
    MsgVoicePlayStateRole = Qt::UserRole + 15,
    MsgVoicePlayPosRole   = Qt::UserRole + 16,
    MsgVoiceWaveformRole  = Qt::UserRole + 17,
    MsgVoiceFileSizeRole  = Qt::UserRole + 18,
    MsgVoiceBlockSizeRole = Qt::UserRole + 19,
    MsgAuthorNodeIdRole   = Qt::UserRole + 20,
    MsgVoiceNumBlocksRole = Qt::UserRole + 21,
    MsgVoiceSigsRole      = Qt::UserRole + 22,
    MsgFileDisplayNameRole = Qt::UserRole + 23,
    MsgFileSizeRole       = Qt::UserRole + 24,
    MsgFileDownloadStateRole = Qt::UserRole + 25,
    MsgChannelIdRole      = Qt::UserRole + 26,
    MsgFileDownloadProgressRole = Qt::UserRole + 27,
    MsgMediaBlocksDoneRole  = Qt::UserRole + 28,
    MsgMediaNumBlocksRole   = Qt::UserRole + 29,
    MsgVoiceDownloadPendingRole = Qt::UserRole + 30,
    MsgImageWidthRole       = Qt::UserRole + 31,
    MsgImageHeightRole      = Qt::UserRole + 32,
    MsgVideoWidthRole       = Qt::UserRole + 33,
    MsgVideoHeightRole      = Qt::UserRole + 34,
    MsgVideoDurationMsRole  = Qt::UserRole + 35,
    MsgDeliveryStateRole   = Qt::UserRole + 36,
    MsgInviteLinkRole      = Qt::UserRole + 37, /* полная ссылка; MsgTextRole содержит локализованный заголовок и ссылку */
    MsgMessageKeyRole      = Qt::UserRole + 38,
    MsgRawTimestampRole    = Qt::UserRole + 39,
    MsgReplyToRole         = Qt::UserRole + 40,
    MsgHighlightRole       = Qt::UserRole + 41,
};

class MessageDelegate : public QStyledItemDelegate {
    Q_OBJECT
public:
    static constexpr int kAvatar = 54;

    explicit MessageDelegate(QObject *parent = nullptr);

    void paint(QPainter *painter, const QStyleOptionViewItem &option,
               const QModelIndex &index) const override;
    QSize sizeHint(const QStyleOptionViewItem &option,
                   const QModelIndex &index) const override;
    bool editorEvent(QEvent *event, QAbstractItemModel *model,
                     const QStyleOptionViewItem &option,
                     const QModelIndex &index) override;
    QString linkAt(const QStyleOptionViewItem& option, const QModelIndex& index, const QPoint& point) const;

    static void startAutoPlay(const QString& filePath, float actualDurationSec, uint64_t playbackId);
    static void stopAllAutoPlay();

    void setVideoOpenCallback(std::function<void(const QString&)> cb) { m_videoOpenCb = std::move(cb); }
    void setImageOpenCallback(std::function<void(const QString&)> cb) { m_imageOpenCb = std::move(cb); }
    void setDownloadCallback(std::function<bool(const QModelIndex&)> cb) { m_downloadCb = std::move(cb); }
signals:
    void avatarRequested(const QString& channel, quint64 owner);
    void reactionRequested(const QModelIndex& index, int emoji); /* -1 открывает выбор реакции */
    void pollRequested(const QString& messageId);
    void replyRequested(const QString& messageId);

private:
    struct ReactionChip { QRect rect; int id; QString emoji; int count; bool mine; };
    struct Layout {
        int viewWidth;
        int bubbleWidth;
        QRect authorRect;
        QRect avatarRect;
        QRect bubbleRect;
        QRect quoteRect;
        QRect quoteBarRect;
        QRect quoteAuthorRect;
        QRect quoteTextRect;
        QRect textRect;
        QRect statusRect;
        QRect deliveryRect;
        int totalHeight;
        bool narrow = false;
        bool emojiOnly = false;
        int emojiCount = 0;
        QRect emojiArea;
        bool isOutgoing = false;
        bool isVoice = false;
        bool isFile = false;
        bool isVideo = false;
        bool isImage = false;
        QRect voicePlayBtnRect;
        QRect voiceWaveformRect;
        QRect voiceDurationRect;
        QRect voiceTimeRect;
        QString voiceDuration;
        int mediaBarColor = 0; /* 0=gray, 1=yellow, 2=green */
        QRect mediaBarRect;
        QRect progressBarRect;
        float progressFrac = 0.0f;
        QRect videoThumbRect;
        QRect videoPlayBtnRect;
        QRect videoDurBadgeRect;
        QRect imageThumbRect;
        QRect imageBadgeRect;
        QRect reactionHeart;
        QRect reactionTime;
        QString reactionTimeText;
        QVector<ReactionChip> reactionChips;
    };

    std::function<void(const QString&)> m_videoOpenCb;
    std::function<void(const QString&)> m_imageOpenCb;
    QPersistentModelIndex m_avatarPress;
    QPoint m_avatarPressPosition;
    QPersistentModelIndex m_reactionPress;
    QPoint m_reactionPressPosition;
    int m_pressedReaction = -2;
    QPersistentModelIndex m_pollPress;
    QPoint m_pollPressPosition;
    QPersistentModelIndex m_quotePress;
    QPoint m_quotePressPosition;
    std::function<bool(const QModelIndex&)> m_downloadCb;

    Layout calcLayout(const QStyleOptionViewItem &option,
                      const QModelIndex &index) const;
    Layout calcBodyLayout(const QStyleOptionViewItem& option, const QModelIndex& index) const;
    void paintBody(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index, const Layout& layout) const;
    void drawReactions(QPainter* painter, const Layout& layout, const QStyleOptionViewItem& option) const;
    void drawQuote(QPainter *p, const Layout &L,
                   const QModelIndex &index, const QStyleOptionViewItem &opt) const;
    void drawBubble(QPainter *p, const Layout &L, const QStyleOptionViewItem &opt) const;
    void drawStatusBar(QPainter *p, const Layout &L,
                       const QModelIndex &index, const QStyleOptionViewItem &opt) const;
    void drawAvatar(QPainter *p, const Layout &L,
                    const QModelIndex &index) const;

    static constexpr int kGap      = 8;
    static constexpr int kRadius   = 10;
    static constexpr int kPadH     = 12;
    static constexpr int kPadTop   = 8;
    static constexpr int kPadBot   = 6;
    static constexpr int kTail     = 6;
    static constexpr int kMarginH  = 8;
    static constexpr int kItemGap  = 3;
    static constexpr int kQuoteGap = 4;
    static constexpr int kQuotePadH = 6;
    static constexpr int kQuotePadV = 6;
    static constexpr int kQuoteBarW = 2;
    static constexpr int kQuoteAv  = 16;
    static constexpr int kStatusH  = 18;
};