with agar.core.event;
with agar.core.slist;
with agar.core.timeout;
with agar.gui.surface;
with agar.gui.widget.menu;
with agar.gui.widget.scrollbar;
with agar.gui.window;

package agar.gui.widget.table is

  use type c.unsigned;

  type popup_t is limited private;
  type popup_access_t is access all popup_t;
  pragma convention (c, popup_access_t);

  txt_max      : constant := 128;
  fmt_max      : constant := 16;
  col_name_max : constant := 48; 

  type select_mode_t is (SEL_ROWS, SEL_CELLS, SEL_COLS);
   for select_mode_t use (SEL_ROWS => 0, SEL_CELLS => 1, SEL_COLS => 2);
   for select_mode_t'size use c.unsigned'size;
  pragma convention (c, select_mode_t);

  package popup_slist is new agar.core.slist
    (entry_type => popup_access_t);

  type cell_type_t is (
    CELL_NULL,
    CELL_STRING,
    CELL_INT,
    CELL_UINT,
    CELL_LONG,
    CELL_ULONG,
    CELL_FLOAT,
    CELL_DOUBLE,
    CELL_PSTRING,
    CELL_PINT,
    CELL_PUINT,
    CELL_PLONG,
    CELL_PULONG,
    CELL_PUINT8,
    CELL_PSINT8,
    CELL_PUINT16,
    CELL_PSINT16,
    CELL_PUINT32,
    CELL_PSINT32,
    CELL_PFLOAT,
    CELL_PDOUBLE,
    CELL_INT64,
    CELL_UINT64,
    CELL_PINT64,
    CELL_PUINT64,
    CELL_POINTER,
    CELL_FN_SU,
    CELL_FN_TXT,
    CELL_WIDGET
  );
  for cell_type_t use (
    CELL_NULL    => 0,
    CELL_STRING  => 1,
    CELL_INT     => 2,
    CELL_UINT    => 3,
    CELL_LONG    => 4,
    CELL_ULONG   => 5,
    CELL_FLOAT   => 6,
    CELL_DOUBLE  => 7,
    CELL_PSTRING => 8,
    CELL_PINT    => 9,
    CELL_PUINT   => 10,
    CELL_PLONG   => 11,
    CELL_PULONG  => 12,
    CELL_PUINT8  => 13,
    CELL_PSINT8  => 14,
    CELL_PUINT16 => 15,
    CELL_PSINT16 => 16,
    CELL_PUINT32 => 17,
    CELL_PSINT32 => 18,
    CELL_PFLOAT  => 19,
    CELL_PDOUBLE => 20,
    CELL_INT64   => 21,
    CELL_UINT64  => 22,
    CELL_PINT64  => 23,
    CELL_PUINT64 => 24,
    CELL_POINTER => 25,
    CELL_FN_SU   => 26,
    CELL_FN_TXT  => 27,
    CELL_WIDGET  => 28
  );
  for cell_type_t'size use c.unsigned'size;
  pragma convention (c, cell_type_t);

  type cell_data_text_t is array (1 .. txt_max) of aliased c.char;
  pragma convention (c, cell_data_text_t);

  type cell_data_selector_t is (sel_s, sel_i, sel_f, sel_p, sel_l, sel_u64);
  type cell_data_t (member : cell_data_selector_t := sel_s) is record
    case member is
      when sel_s   => s   : cell_data_text_t;
      when sel_i   => i   : c.int;
      when sel_f   => f   : c.double;
      when sel_p   => p   : agar.core.types.void_ptr_t;
      when sel_l   => l   : c.long;
      when sel_u64 => u64 : agar.core.types.uint64_t;
    end case;
  end record;
  pragma convention (c, cell_data_t);
  pragma unchecked_union (cell_data_t);

  type cell_format_t is array (1 .. fmt_max) of aliased c.char;
  pragma convention (c, cell_format_t);

  type cell_t is limited private;
  type cell_access_t is access all cell_t;
  pragma convention (c, cell_access_t);

  type column_name_t is array (1 .. col_name_max) of aliased c.char;
  pragma convention (c, column_name_t);

  type column_flags_t is new c.unsigned;
  TABLE_COL_FILL        : constant column_flags_t := 16#01#;
  TABLE_SORT_ASCENDING  : constant column_flags_t := 16#02#;
  TABLE_SORT_DESCENDING : constant column_flags_t := 16#04#;
  TABLE_HFILL           : constant column_flags_t := 16#08#;
  TABLE_VFILL           : constant column_flags_t := 16#10#;
  TABLE_EXPAND          : constant column_flags_t := TABLE_HFILL or TABLE_VFILL;

  type column_t is limited private;
  type column_access_t is access all column_t;
  pragma convention (c, column_access_t);

  type table_flags_t is new c.unsigned;
  TABLE_MULTI          : constant table_flags_t := 16#01#;
  TABLE_MULTITOGGLE    : constant table_flags_t := 16#02#;
  TABLE_REDRAW_CELLS   : constant table_flags_t := 16#04#;
  TABLE_POLL           : constant table_flags_t := 16#08#;
  TABLE_HIGHLIGHT_COLS : constant table_flags_t := 16#40#;
  TABLE_MULTIMODE      : constant table_flags_t := TABLE_MULTI or TABLE_MULTITOGGLE;

  type table_t is limited private;
  type table_access_t is access all table_t;
  pragma convention (c, table_access_t);

  type sort_callback_t is access function
    (elem1 : agar.core.types.void_ptr_t;
     elem2 : agar.core.types.void_ptr_t) return c.int;
  pragma convention (c, sort_callback_t);

  -- API

  function allocate
    (parent : widget_access_t;
     flags  : table_flags_t) return table_access_t;
  pragma import (c, allocate, "AG_TableNew");

  function allocate_polled
    (parent   : widget_access_t;
     flags    : table_flags_t;
     callback : agar.core.event.callback_t) return table_access_t;
  pragma inline (allocate_polled);

  procedure size_hint
    (table    : table_access_t;
     width    : positive;
     num_rows : positive);
  pragma inline (size_hint);

  procedure set_separator
    (table     : table_access_t;
     separator : string);
  pragma inline (set_separator);

  function set_popup
    (table  : table_access_t;
     row    : integer;
     column : integer) return agar.gui.widget.menu.item_access_t;
  pragma inline (set_popup);

  procedure set_row_double_click_func
    (table    : table_access_t;
     callback : agar.core.event.callback_t);
  pragma inline (set_row_double_click_func);

  procedure set_column_double_click_func
    (table    : table_access_t;
     callback : agar.core.event.callback_t);
  pragma inline (set_column_double_click_func);

  -- table functions

  procedure table_begin (table : table_access_t);
  pragma import (c, table_begin, "AG_TableBegin");

  procedure table_end (table : table_access_t);
  pragma import (c, table_end, "AG_TableEnd");

  -- column functions

  function add_column
    (table         : table_access_t;
     name          : string;
     size_spec     : string;
     sort_callback : sort_callback_t) return boolean;
  pragma inline (add_column);

  procedure select_column
    (table  : table_access_t;
     column : integer);
  pragma inline (select_column);

  procedure deselect_column
    (table  : table_access_t;
     column : integer);
  pragma inline (deselect_column);

  procedure select_all_columns (table : table_access_t);
  pragma import (c, select_all_columns, "AG_TableSelectAllCols");

  procedure deselect_all_columns (table : table_access_t);
  pragma import (c, deselect_all_columns, "AG_TableDeselectAllCols");

  function column_selected
    (table  : table_access_t;
     column : integer) return boolean;
  pragma inline (column_selected);

  -- row functions

-- TODO: how to get arguments to this function (format string)?
--  function add_row
--    (table         : table_access_t
--     ...
--  pragma inline (add_row);

  procedure select_row
    (table : table_access_t;
     row   : natural);
  pragma inline (select_row);

  procedure deselect_row
    (table : table_access_t;
     row   : natural);
  pragma inline (deselect_row);

  procedure select_all_rows (table : table_access_t);
  pragma import (c, select_all_rows, "AG_TableSelectAllCols");

  procedure deselect_all_rows (table : table_access_t);
  pragma import (c, deselect_all_rows, "AG_TableDeselectAllCols");

  function row_selected
    (table : table_access_t;
     row   : natural) return boolean;
  pragma inline (row_selected);

  -- cell functions

  procedure select_cell
    (table  : table_access_t;
     row    : natural;
     column : natural);
  pragma inline (select_cell);

  procedure deselect_cell
    (table  : table_access_t;
     row    : natural;
     column : natural);
  pragma inline (deselect_cell);

  function cell_selected
    (table  : table_access_t;
     row    : natural;
     column : natural) return boolean;
  pragma inline (cell_selected);

  function compare_cells
    (cell1 : cell_access_t;
     cell2 : cell_access_t) return integer;
  pragma inline (compare_cells);

  --

  function rows (table : table_access_t) return natural;
  pragma inline (rows);

  function columns (table : table_access_t) return natural;
  pragma inline (columns);

  --

  function widget (table : table_access_t) return widget_access_t;
  pragma inline (widget);

private

  type table_t is record
    widget            : aliased widget_t;
    flags             : table_flags_t;
    selmode           : select_mode_t;
    w_hint            : c.int;
    h_hint            : c.int;

    sep               : cs.chars_ptr;
    h_row             : c.int;
    h_col             : c.int;
    w_col_min         : c.int;
    w_col_default     : c.int;

    x_offset          : c.int;
    m_offset          : c.int;

    cols              : column_access_t;
    cells             : access cell_access_t;

    n                 : c.unsigned;
    m                 : c.unsigned;
    m_vis             : c.unsigned;
    n_resizing        : c.int;
    v_bar             : agar.gui.widget.scrollbar.scrollbar_access_t;
    h_bar             : agar.gui.widget.scrollbar.scrollbar_access_t;
    poll_ev           : agar.core.event.event_access_t;
    dbl_click_row_ev  : agar.core.event.event_access_t;
    dbl_click_col_ev  : agar.core.event.event_access_t;
    dbl_click_cell_ev : agar.core.event.event_access_t;
    dbl_clicked_row   : c.int;
    dbl_clicked_col   : c.int;
    dbl_clicked_cell  : c.int;
    wheel_ticks       : agar.core.types.uint32_t;
    inc_to            : agar.core.timeout.timeout_t;
    dec_to            : agar.core.timeout.timeout_t;
    r                 : agar.gui.rect.rect_t;
    w_total           : c.int;

    popups            : popup_slist.head_t;
  end record;
  pragma convention (c, table_t);

  type column_t is record
    name     : column_name_t;
    sort_fn  : access function (a, b : agar.core.types.void_ptr_t) return c.int;
    flags    : column_flags_t;
    selected : c.int;
    w        : c.int;
    w_pct    : c.int;
    x        : c.int;
    surface  : c.int;
    pool     : cell_access_t;
    mpool    : c.unsigned;
  end record;
  pragma convention (c, column_t);

  type cell_t is record
    cell_type : cell_type_t;
    data      : cell_data_t;
    fmt       : cell_format_t;
    fn_su     : access function
      (v : agar.core.types.void_ptr_t;
       n : c.int;
       m : c.int) return agar.gui.surface.surface_access_t;
    fn_txt    : access procedure
      (v : agar.core.types.void_ptr_t;
       s : cs.chars_ptr;
       n : c.size_t);
    widget    : widget_access_t;
    selected  : c.int;
    surface   : c.int;
  end record;
  pragma convention (c, cell_t);

  type popup_t is record
    m      : c.int;
    n      : c.int;
    menu   : agar.gui.widget.menu.menu_access_t;
    item   : agar.gui.widget.menu.item_access_t;
    panel  : agar.gui.window.window_access_t;
    popups : popup_slist.entry_t;
  end record;
  pragma convention (c, popup_t);

end agar.gui.widget.table;