/*
 *   mooterm/mooterm-private.h
 *
 *   Copyright (C) 2004-2005 by Yevgen Muntyan <muntyan@math.tamu.edu>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   See COPYING file that comes with this distribution.
 */

#ifndef MOOTERM_MOOTERM_PRIVATE_H
#define MOOTERM_MOOTERM_PRIVATE_H

#include "mooterm/mooterm.h"
#include "mooterm/mooterm-vt.h"

G_BEGIN_DECLS


#define ADJUSTMENT_PRIORITY         G_PRIORITY_HIGH_IDLE
#define ADJUSTMENT_DELTA            30.0
#define EXPOSE_PRIORITY             G_PRIORITY_DEFAULT
#define EXPOSE_TIMEOUT              2

#define PT_WRITER_PRIORITY          G_PRIORITY_DEFAULT
#define PT_READER_PRIORITY          G_PRIORITY_DEFAULT

#define MIN_TERMINAL_WIDTH          10
#define MIN_TERMINAL_HEIGHT         10
#define MAX_TERMINAL_WIDTH          4096

#define DEFAULT_MONOSPACE_FONT      "Courier New 9"
#define DEFAULT_MONOSPACE_FONT2     "Monospace"


typedef enum {
    CURSOR_NONE     = 0,
    CURSOR_TEXT     = 1,
    CURSOR_POINTER  = 2,
    CURSORS_NUM     = 3
} TermCursorType;

enum {
    NORMAL      = 0,
    SELECTED    = 1,
    CURSOR      = 2
};

typedef enum {
    CARET_BLOCK,
    CARET_UNDERLINE
} TermCaretShape;


typedef struct _TermFontInfo    TermFontInfo;
typedef struct _TermSelection   TermSelection;


struct _MooTermPrivate {
    struct _MooTermPt       *pt;
    struct _MooTermParser   *parser;

    struct _MooTermBuffer   *buffer;
    struct _MooTermBuffer   *primary_buffer;
    struct _MooTermBuffer   *alternate_buffer;

    guint8          modes[MODE_MAX];
    guint8          saved_modes[MODE_MAX];

    gboolean        _scrolled;
    guint           _top_line;
    guint           width;
    guint           height;

    guint           cursor_row;
    guint           cursor_col;

    TermSelection  *selection;

    TermFontInfo   *font_info;

    GdkPixmap      *back_pixmap;
    GdkRegion      *changed_content; /* buffer coordinates, relative to top_line */
    GdkGC          *clip;
    gboolean        font_changed;
    PangoLayout    *layout;
    gboolean        cursor_visible;
    guint           pending_expose;

    GdkGC          *fg[MOO_TERM_COLOR_MAX + 1][3];
    GdkGC          *bg[MOO_TERM_COLOR_MAX + 1][3];

    TermCaretShape  caret_shape;
    guint           caret_height;

    GdkCursor      *cursor[CURSORS_NUM];
    GtkIMContext   *im;

    gboolean        scroll_on_keystroke;

    GtkAdjustment  *adjustment;
    guint           pending_adjustment_changed;
    guint           pending_adjustment_value_changed;
};

void        moo_term_set_window_title       (MooTerm        *term,
                                             const char     *title);
void        moo_term_set_icon_name          (MooTerm        *term,
                                             const char     *title);

void        moo_term_set_alternate_buffer   (MooTerm        *term,
                                             gboolean        alternate);

void        moo_term_buf_content_changed    (MooTerm        *term,
                                             MooTermBuffer  *buf);
void        moo_term_cursor_moved           (MooTerm        *term,
                                             MooTermBuffer  *buf);

void        moo_term_size_changed           (MooTerm        *term);
void        moo_term_buf_size_changed       (MooTerm        *term);

void        moo_term_init_font_stuff        (MooTerm        *term);
void        moo_term_setup_palette          (MooTerm        *term);
void        moo_term_im_commit              (GtkIMContext   *imcontext,
                                             gchar          *arg,
                                             MooTerm        *term);

gboolean    moo_term_button_press           (GtkWidget      *widget,
                                             GdkEventButton *event);
gboolean    moo_term_button_release         (GtkWidget      *widget,
                                             GdkEventButton *event);
gboolean    moo_term_key_press              (GtkWidget      *widget,
                                             GdkEventKey    *event);
gboolean    moo_term_key_release            (GtkWidget      *widget,
                                             GdkEventKey    *event);

void        moo_term_init_back_pixmap       (MooTerm        *term);
void        moo_term_resize_back_pixmap     (MooTerm        *term);
void        moo_term_update_back_pixmap     (MooTerm        *term);
void        moo_term_invalidate_content_all (MooTerm        *term);
void        moo_term_invalidate_content_rect(MooTerm        *term,
                                             GdkRectangle   *rect);

gboolean    moo_term_expose_event           (GtkWidget      *widget,
                                             GdkEventExpose *event);
void        moo_term_invalidate_rect        (MooTerm        *term,
                                             GdkRectangle   *rect);
void        moo_term_force_update           (MooTerm        *term);

inline static void moo_term_invalidate_all  (MooTerm        *term)
{
    GdkRectangle rec = {0, 0, term->priv->width, term->priv->height};
    moo_term_invalidate_rect (term, &rec);
}


/*************************************************************************/
/* vt commands
 */

void        moo_term_bell                   (MooTerm    *term);
void        moo_term_decid                  (MooTerm    *term);


/*************************************************************************/
/* font info
 */

struct _TermFontInfo {
    PangoContext   *ctx;
    guint           width;
    guint           height;
    guint           ascent;
};

void             term_font_info_calculate   (TermFontInfo           *info);
void             term_font_info_set_font    (TermFontInfo           *info,
                                             PangoFontDescription   *font_desc);
TermFontInfo    *term_font_info_new         (PangoContext           *ctx);
void             term_font_info_free        (TermFontInfo           *info);


#define term_top_line(term)                     \
    ((term)->priv->_scrolled ?                  \
        (term)->priv->_top_line :               \
        buf_scrollback ((term)->priv->buffer))


/*************************************************************************/
/* TermSelection
 */

enum {
    NOT_SELECTED    = 0,
    FULL_SELECTED   = 1,
    PART_SELECTED   = 2
};

#define SELECT_SCROLL_NONE  (0)
#define SELECT_SCROLL_UP    (-1)
#define SELECT_SCROLL_DOWN  (1)

struct _TermSelection {
    guint       screen_width;

    // absolute coordinates in the buffer
    // selected range is [(l_row, l_col), (r_row, r_col))
    // l_row, l_col and r_row are valid
    // r_col may be equal to _width
    guint       l_row;
    guint       l_col;
    guint       r_row;
    guint       r_col;
    gboolean    empty;

    gboolean    button_pressed;
    int         click;
    gboolean    drag;
    // buffer coordinates
    guint       drag_begin_row;
    guint       drag_begin_col;
    guint       drag_end_row;
    guint       drag_end_col;

    int scroll;
    guint st_id;
};


TermSelection   *term_selection_new         (void);
inline static void term_selection_free      (TermSelection *sel)
{
    g_free (sel);
}

void             term_set_selection         (MooTerm       *term,
                                             guint          row1,
                                             guint          col1,
                                             guint          row2,
                                             guint          col2);
void             term_selection_clear       (MooTerm       *term);

inline static void term_selection_set_width (MooTerm       *term,
                                             guint          width)
{
    term->priv->selection->screen_width = width;
    term_selection_clear (term);
}

inline static int term_selection_row_selected (TermSelection *sel,
                                               guint          row)
{
    if (sel->empty || sel->r_row < row || row < sel->l_row)
        return NOT_SELECTED;
    else if (sel->l_row < row && row < sel->r_row)
        return FULL_SELECTED;
    else
        return PART_SELECTED;
}

inline static gboolean term_selected           (TermSelection   *sel,
                                                guint            row,
                                                guint            col)
{
    if (sel->empty || sel->r_row < row || row < sel->l_row)
        return FALSE;
    else if (sel->l_row < row && row < sel->r_row)
        return TRUE;
    else if (sel->l_row == sel->r_row)
        return sel->l_col <= col && col < sel->r_col;
    else if (sel->l_row == row)
        return sel->l_col <= col;
    else
        return col < sel->r_row;
}


G_END_DECLS

#endif /* MOOTERM_MOOTERM_PRIVATE_H */