//
// aegis - project change supervisor
// Copyright (C) 2002-2008, 2011, 2012, 2014 Peter Miller
//
// 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 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//

#include <common/ac/stddef.h>
#include <common/ac/sys/types.h>
#include <common/ac/sys/stat.h>

#include <libaegis/change.h>
#include <libaegis/change/file.h>
#include <aecomplete/complete/change/file_union.h>
#include <aecomplete/complete/private.h>
#include <libaegis/dir_stack.h>
#include <libaegis/os.h>
#include <libaegis/project/file.h>
#include <aecomplete/shell.h>
#include <common/str_list.h>


struct complete_change_file_union_ty
{
    complete_ty     inherited;
    change::pointer cp;
    int             baserel;
    int             regular_ok;
    int             special_ok;
    int             source_ok;
};


static void
destructor(complete_ty *cp)
{
    complete_change_file_union_ty *this_thing;

    this_thing = (complete_change_file_union_ty *)cp;
    this_thing->cp.reset();
}


static void
perform(complete_ty *cp, shell_ty *sh)
{
    complete_change_file_union_ty *this_thing;
    string_ty       *prefix;
    string_ty       *prefix_dir;
    string_ty       *prefix_ent;
    size_t          j;
    string_list_ty  search_path;
    string_list_ty  names;
    string_ty       *base = 0;

    //
    // Get the change search path.
    //
    this_thing = (complete_change_file_union_ty *)cp;
    this_thing->cp->search_path_get(&search_path, true);

    if (this_thing->baserel)
        base = str_from_c("");
    else
    {
        string_ty       *cwd;
        string_ty       *tmp;

        os_become_orig();
        cwd = os_curdir();
        os_become_undo();

        for (j = 0; j < search_path.size(); ++j)
        {
            tmp = os_below_dir(search_path[j], cwd);
            if (tmp)
            {
                if (tmp->str_length)
                {
                    base = str_format("%s/", tmp->str_text);
                    str_free(tmp);
                }
                else
                    base = tmp;
                break;
            }
        }
        if (j >= search_path.size())
        {
            //
            // They are in a weird place, assume base relative.
            //
            base = str_from_c("");
        }
        str_free(cwd);
    }

    //
    // Break the prefix into directory part and filename part.
    //
    prefix = str_catenate(base, shell_prefix_get(sh));
    prefix_dir = os_dirname_relative(prefix);
    prefix_ent = os_entryname_relative(prefix);

    //
    // Read the directory (the stack union) for the file names.
    //
    os_become_orig();
    dir_stack_readdir(&search_path, prefix_dir, &names);
    os_become_undo();

    //
    // Troll the names.
    //
    for (j = 0; j < names.size(); ++j)
    {
        string_ty       *name;
        struct stat     st;
        string_ty       *path;
        string_ty       *relfn;
        string_ty       *s;

        //
        // Make sure we like the name.
        //
        name = names[j];
        if (!str_leading_prefix(name, prefix_ent))
            continue;

        //
        // Ignore project source files
        // and change source files.
        //
        path = os_path_cat(prefix_dir, name);
        if (!this_thing->source_ok)
        {
            fstate_src_ty *src =
                this_thing->cp->project_get()->file_find(path,
                    view_path_extreme);
            if (src)
            {
                str_free(path);
                continue;
            }
            src = this_thing->cp->file_find(nstring(path), view_path_first);
            if (src)
            {
                str_free(path);
                continue;
            }
        }

        //
        // Find out what it is.
        // (Ignore if can't stat.)
        //
        s = dir_stack_find(&search_path, 0, path, &st, 0, 1);
        if (!s)
            continue;
        str_free(s);

        //
        // Remove the base portion before emitting.
        //
        relfn =
            str_n_from_c
            (
                path->str_text + base->str_length,
                path->str_length - base->str_length
            );

        //
        // Be selective about what we print.
        //
        if (S_ISDIR(st.st_mode))
        {
            //
            // We emit directories with and without a slash, so that Bash
            // doesn't think we are finished, and put a space after the
            // argument if there is only one directory in the answer.
            //
            shell_emit(sh, relfn);
            s = str_format("%s/", relfn->str_text);
            shell_emit(sh, s);
            str_free(s);
        }
        else if (S_ISREG(st.st_mode))
        {
            if (this_thing->regular_ok)
                shell_emit(sh, relfn);
        }
        else
        {
            if (this_thing->special_ok)
                shell_emit(sh, relfn);
        }
        str_free(relfn);
        str_free(path);
    }
    str_free(prefix_ent);
    str_free(prefix_dir);
}


static complete_vtbl_ty vtbl =
{
    destructor,
    perform,
    sizeof(complete_change_file_union_ty),
    "change file union",
};


complete_ty *
complete_change_file_union(change::pointer cp, int baserel, int dir_only)
{
    complete_ty     *result;
    complete_change_file_union_ty *this_thing;

    result = complete_new(&vtbl);
    this_thing = (complete_change_file_union_ty *)result;
    this_thing->cp = cp;
    this_thing->baserel = !!baserel;
    this_thing->regular_ok = !dir_only;
    this_thing->special_ok = 0;
    this_thing->source_ok = 0;
    return result;
}


// vim: set ts=8 sw=4 et :