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/* vim: set sw=4 sts=4 et foldmethod=syntax : */

/*
 * Copyright (c) 2005, 2006 Ciaran McCreesh <ciaranm@ciaranm.org>
 *
 * This file is part of the Paludis package manager. Paludis is free software;
 * you can redistribute it and/or modify it under the terms of the GNU General
 * Public License version 2, as published by the Free Software Foundation.
 *
 * Paludis 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, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "colour.hh"
#include "uninstall.hh"

#include <paludis/environment/default/default_environment.hh>
#include <paludis/tasks/uninstall_task.hh>

#include <iostream>

/** \file
 * Handle the --uninstall action for the main paludis program.
 */

using namespace paludis;

using std::cerr;
using std::cout;
using std::endl;

namespace
{
    class OurUninstallTask :
        public UninstallTask
    {
        private:
            int _count, _current_count;

        public:
            OurUninstallTask() :
                UninstallTask(DefaultEnvironment::get_instance()),
                _count(0),
                _current_count(0)
            {
            };

            virtual void on_build_unmergelist_pre()
            {
                cout << "Building unmerge list... " << std::flush;
            }

            virtual void on_build_unmergelist_post()
            {
                cout << "done" << endl;
            }

            virtual void on_display_unmerge_list_pre()
            {
                cout << endl << colour(cl_heading, "These packages will be uninstalled:")
                    << endl << endl;
            }

            virtual void on_display_unmerge_list_post()
            {
                cout << endl << endl <<
                    "Total: " << _count << (_count == 1 ? " package" : " packages") << endl;
            }

            virtual void on_display_unmerge_list_entry(const PackageDatabaseEntry & d)
            {
                cout << "* " << colour(cl_package_name, stringify(d)) << endl;
                ++_count;
            }

            virtual void on_uninstall_all_pre()
            {
            }

            virtual void on_uninstall_pre(const PackageDatabaseEntry & d)
            {
                cout << endl << colour(cl_heading, "Uninstalling " +
                        stringify(d.name) + "-" + stringify(d.version) +
                        "::" + stringify(d.repository)) << endl << endl;

                cerr << xterm_title("(" + stringify(++_current_count) + " of " +
                        stringify(_count) + ") Uninstalling " +
                        stringify(d.name) + "-" + stringify(d.version) +
                        "::" + stringify(d.repository));
            }

            virtual void on_uninstall_post(const PackageDatabaseEntry &)
            {
            }

            virtual void on_uninstall_all_post()
            {
            }

            virtual void on_update_world_pre()
            {
                cout << endl << colour(cl_heading, "Updating world file") << endl << endl;
            }

            virtual void on_update_world(const PackageDepAtom & a)
            {
                cout << "* removing " << colour(cl_package_name, a.package()) << endl;
            }

            virtual void on_update_world_post()
            {
                cout << endl;
            }

            virtual void on_preserve_world()
            {
                cout << endl << colour(cl_heading, "Updating world file") << endl << endl;
                cout << "* --preserve-world was specified, skipping world changes" << endl;
                cout << endl;
            }
    };
}

int
do_uninstall()
{
    int return_code(0);

    Context context("When performing uninstall action from command line:");

    OurUninstallTask task;

    task.set_pretend(CommandLine::get_instance()->a_pretend.specified());
    task.set_no_config_protect(CommandLine::get_instance()->a_no_config_protection.specified());
    task.set_preserve_world(CommandLine::get_instance()->a_preserve_world.specified());

    try
    {
        for (CommandLine::ParametersIterator q(CommandLine::get_instance()->begin_parameters()),
                q_end(CommandLine::get_instance()->end_parameters()) ; q != q_end ; ++q)
            task.add_target(*q);

        task.execute();

        cout << endl;
    }
    catch (const AmbiguousUnmergeTargetError & e)
    {
        cout << endl;
        cerr << "Query error:" << endl;
        cerr << "  * " << e.backtrace("\n  * ");
        cerr << "Ambiguous unmerge target '" << e.target() << "'. Did you mean:" << endl;
        for (AmbiguousUnmergeTargetError::Iterator o(e.begin()),
                o_end(e.end()) ; o != o_end ; ++o)
            cerr << "    * =" << colour(cl_package_name, *o) << endl;
        cerr << endl;
        return 1;
    }
    catch (const PackageUninstallActionError & e)
    {
        cout << endl;
        cerr << "Uninstall error:" << endl;
        cerr << "  * " << e.backtrace("\n  * ");
        cerr << e.message() << endl;

        return_code |= 1;
    }
    catch (const NoSuchPackageError & e)
    {
        cout << endl;
        cerr << "Query error:" << endl;
        cerr << "  * " << e.backtrace("\n  * ");
        cerr << "No such package '" << e.name() << "'" << endl;
        return 1;
    }

    return return_code;
}