/*
4coder_scope_commands.cpp - A set of commands and helpers relevant for scope level navigation and editing.
*/

// TOP

CUSTOM_COMMAND_SIG(select_surrounding_scope)
CUSTOM_DOC("Finds the scope enclosed by '{' '}' surrounding the cursor and puts the cursor and mark on the '{' and '}'.")
{
    View_ID view = get_active_view(app, AccessProtected);
    Buffer_ID buffer = view_get_buffer(app, view, AccessProtected);
    i64 pos = view_get_cursor_pos(app, view);
    Range_i64 range = {};
    if (find_surrounding_nest(app, buffer, pos, FindNest_Scope, &range)){
        select_scope(app, view, range);
    }
}

function void
select_next_scope_after_pos(Application_Links *app, View_ID view, Buffer_ID buffer, i64 pos){
    Find_Nest_Flag flags = FindNest_Scope;
    Range_i64 range = {};
    if (find_nest_side(app, buffer, pos + 1,
                       flags, Scan_Forward, NestDelim_Open, &range) &&
        find_nest_side(app, buffer, range.end,
                       flags|FindNest_Balanced|FindNest_EndOfToken, Scan_Forward,
                       NestDelim_Close, &range.end)){
        select_scope(app, view, range);
    }
}

CUSTOM_COMMAND_SIG(select_next_scope_absolute)
CUSTOM_DOC("Finds the first scope started by '{' after the cursor and puts the cursor and mark on the '{' and '}'.")
{
    View_ID view = get_active_view(app, AccessProtected);
    Buffer_ID buffer = view_get_buffer(app, view, AccessProtected);
    i64 pos = view_get_cursor_pos(app, view);
    select_next_scope_after_pos(app, view, buffer, pos);
}

CUSTOM_COMMAND_SIG(select_next_scope_after_current)
CUSTOM_DOC("Finds the first scope started by '{' after the mark and puts the cursor and mark on the '{' and '}'.  This command is meant to be used after a scope is already selected so that it will have the effect of selecting the next scope after the current scope.")
{
    View_ID view = get_active_view(app, AccessProtected);
    Buffer_ID buffer = view_get_buffer(app, view, AccessProtected);
    i64 pos = view_get_mark_pos(app, view);
    select_next_scope_after_pos(app, view, buffer, pos);
}

CUSTOM_COMMAND_SIG(select_prev_scope_absolute)
CUSTOM_DOC("Finds the first scope started by '{' before the cursor and puts the cursor and mark on the '{' and '}'.")
{
    View_ID view = get_active_view(app, AccessProtected);
    Buffer_ID buffer = view_get_buffer(app, view, AccessProtected);
    i64 pos = view_get_cursor_pos(app, view);
    Find_Nest_Flag flags = FindNest_Scope;
    Range_i64 range = {};
    if (find_nest_side(app, buffer, pos - 1,
                       flags, Scan_Backward, NestDelim_Open, &range) &&
        find_nest_side(app, buffer, range.end,
                       flags|FindNest_Balanced|FindNest_EndOfToken, Scan_Forward,
                       NestDelim_Close, &range.end)){
        select_scope(app, view, range);
    }
}

CUSTOM_COMMAND_SIG(place_in_scope)
CUSTOM_DOC("Wraps the code contained in the range between cursor and mark with a new curly brace scope.")
{
    place_begin_and_end_on_own_lines(app, "{", "}");
}

CUSTOM_COMMAND_SIG(delete_current_scope)
CUSTOM_DOC("Deletes the braces surrounding the currently selected scope.  Leaves the contents within the scope.")
{
    View_ID view = get_active_view(app, AccessOpen);
    Buffer_ID buffer = view_get_buffer(app, view, AccessOpen);
    
    Range_i64 range = get_view_range(app, view);
    if (buffer_get_char(app, buffer, range.min) == '{' &&
        buffer_get_char(app, buffer, range.max - 1) == '}'){
        i32 top_len = 1;
        i32 bot_len = 1;
        if (buffer_get_char(app, buffer, range.min - 1) == '\n'){
            top_len = 2;
        }
        if (buffer_get_char(app, buffer, range.max + 1) == '\n'){
            bot_len = 2;
        }
        
        Batch_Edit batch_first = {};
        Batch_Edit batch_last = {};
        
        batch_first.edit.text = SCu8();
        batch_first.edit.range = Ii64(range.min + 1 - top_len, range.min + 1);
        batch_first.next = &batch_last;
        batch_last.edit.text = SCu8();
        batch_last.edit.range = Ii64((i32)(range.max - 1), (i32)(range.max - 1 + bot_len));
        
        buffer_batch_edit(app, buffer, &batch_first);
    }
}

// BOTTOM