/*
 *	aegis - project change supervisor
 *	Copyright (C) 2001-2003 Peter Miller;
 *	All rights reserved.
 *
 *	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.
 *
 *	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, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate aemvus
 */

#include <ac/stdio.h>

#include <aemvu.h>
#include <ael/change/files.h>
#include <arglex2.h>
#include <arglex/change.h>
#include <arglex/project.h>
#include <change.h>
#include <change/file.h>
#include <change/branch.h>
#include <commit.h>
#include <error.h>
#include <help.h>
#include <lock.h>
#include <log.h>
#include <os.h>
#include <pconf.h>
#include <progname.h>
#include <project.h>
#include <project/file.h>
#include <str_list.h>
#include <sub.h>
#include <trace.h>
#include <user.h>
#include <zero.h>


static void
move_file_undo_usage(void)
{
    const char      *progname;

    progname = progname_get();
    fprintf
    (
	stderr,
	"usage: %s -MoVe_file_Undo [ <option>... ] <filename>...\n",
	progname
    );
    fprintf
    (
	stderr,
	"       %s -MoVe_file_Undo -List [ <option>... ]\n",
	progname
    );
    fprintf(stderr, "       %s -MoVe_file_Undo -Help\n", progname);
    quit(1);
}


static void
move_file_undo_help(void)
{
    help("aemvu", move_file_undo_usage);
}


static void
move_file_undo_list(void)
{
    string_ty	    *project_name;
    long	    change_number;

    trace(("move_file_undo_list()\n{\n"));
    arglex();
    project_name = 0;
    change_number = 0;
    while (arglex_token != arglex_token_eoln)
    {
	switch (arglex_token)
	{
	default:
	    generic_argument(move_file_undo_usage);
	    continue;

	case arglex_token_change:
	    arglex();
	    /* fall through... */

	case arglex_token_number:
	    arglex_parse_change
	    (
		&project_name,
		&change_number,
		move_file_undo_usage
	    );
	    continue;

	case arglex_token_project:
	    arglex();
	    /* fall through... */

	case arglex_token_string:
	    arglex_parse_project(&project_name, move_file_undo_usage);
	    continue;
	}
	arglex();
    }
    list_change_files(project_name, change_number, 0);
    if (project_name)
	str_free(project_name);
    trace(("}\n"));
}


static void
move_file_undo_main(void)
{
    sub_context_ty  *scp;
    string_list_ty  wl;
    string_list_ty  wl2;
    cstate_ty	    *cstate_data;
    size_t	    j;
    size_t	    k;
    string_ty	    *s1;
    string_ty	    *s2;
    string_ty	    *project_name;
    project_ty	    *pp;
    long	    change_number;
    change_ty	    *cp;
    log_style_ty    log_style;
    user_ty	    *up;
    int		    config_seen;
    int		    number_of_errors;
    string_list_ty  search_path;
    int		    mend_symlinks;
    pconf_ty        *pconf_data;
    int		    based;
    string_ty	    *base;
    string_list_ty  wl_nfu;
    string_list_ty  wl_ntu;
    string_list_ty  wl_rmu;

    trace(("move_file_undo_main()\n{\n"));
    string_list_constructor(&wl);
    project_name = 0;
    change_number = 0;
    log_style = log_style_append_default;
    while (arglex_token != arglex_token_eoln)
    {
	switch (arglex_token)
	{
	default:
	    generic_argument(move_file_undo_usage);
	    continue;

	case arglex_token_directory:
	    if (arglex() != arglex_token_string)
		option_needs_dir(arglex_token_directory, move_file_undo_usage);
	    goto get_file_names;

	case arglex_token_file:
	    if (arglex() != arglex_token_string)
		option_needs_files(arglex_token_file, move_file_undo_usage);
	    /* fall through... */

	case arglex_token_string:
	    get_file_names:
	    s2 = str_from_c(arglex_value.alv_string);
	    string_list_append(&wl, s2);
	    str_free(s2);
	    break;

	case arglex_token_keep:
	case arglex_token_interactive:
	case arglex_token_keep_not:
	    user_delete_file_argument(move_file_undo_usage);
	    break;

	case arglex_token_change:
	    arglex();
	    /* fall through... */

	case arglex_token_number:
	    arglex_parse_change
	    (
		&project_name,
		&change_number,
		move_file_undo_usage
	    );
	    continue;

	case arglex_token_project:
	    arglex();
	    arglex_parse_project(&project_name, move_file_undo_usage);
	    continue;

	case arglex_token_nolog:
	    if (log_style == log_style_none)
		duplicate_option(move_file_undo_usage);
	    log_style = log_style_none;
	    break;

	case arglex_token_wait:
	case arglex_token_wait_not:
	    user_lock_wait_argument(move_file_undo_usage);
	    break;

	case arglex_token_base_relative:
	case arglex_token_current_relative:
	    user_relative_filename_preference_argument(move_file_undo_usage);
	    break;
	}
	arglex();
    }
    if (!wl.nstrings)
	fatal_intl(0, i18n("no file names"));

    /*
     * locate project data
     */
    if (!project_name)
	project_name = user_default_project();
    pp = project_alloc(project_name);
    str_free(project_name);
    project_bind_existing(pp);

    /*
     * locate user data
     */
    up = user_executing(pp);

    /*
     * locate change data
     */
    if (!change_number)
	change_number = user_default_change(up);
    cp = change_alloc(pp, change_number);
    change_bind_existing(cp);

    /*
     * lock the change file
     */
    change_cstate_lock_prepare(cp);
    lock_take();
    cstate_data = change_cstate_get(cp);

    log_open(change_logfile_get(cp), up, log_style);

    /*
     * It is an error if the change is not in the in_development state.
     * It is an error if the change is not assigned to the current user.
     */
    if (cstate_data->state != cstate_state_being_developed)
	change_fatal(cp, 0, i18n("bad cp undo state"));
    if (change_is_a_branch(cp))
	change_fatal(cp, 0, i18n("bad cp undo branch"));
    if (!str_equal(change_developer_name(cp), user_name(up)))
	change_fatal(cp, 0, i18n("not developer"));

    /*
     * resolve the path of each file
     * 1.   the absolute path of the file name is obtained
     * 2.   if the file is inside the development directory, ok
     * 3.   if the file is inside the baseline, ok
     * 4.   if neither, error
     */
    config_seen = 0;
    change_search_path_get(cp, &search_path, 1);

    /*
     * Find the base for relative filenames.
     */
    based =
	(
	    search_path.nstrings >= 1
	&&
	    (
		user_relative_filename_preference
		(
		    up,
		    uconf_relative_filename_preference_current
		)
	    ==
		uconf_relative_filename_preference_base
	    )
	);
    if (based)
	base = search_path.string[0];
    else
    {
	os_become_orig();
	base = os_curdir();
	os_become_undo();
    }

    string_list_constructor(&wl2);
    number_of_errors = 0;
    for (j = 0; j < wl.nstrings; ++j)
    {
	string_list_ty	wl_in;

	s1 = wl.string[j];
	if (s1->str_text[0] == '/')
	    s2 = str_copy(s1);
	else
	    s2 = str_format("%S/%S", base, s1);
	user_become(up);
	s1 = os_pathname(s2, 1);
	user_become_undo();
	str_free(s2);
	s2 = 0;
	for (k = 0; k < search_path.nstrings; ++k)
	{
	    s2 = os_below_dir(search_path.string[k], s1);
	    if (s2)
		break;
	}
	str_free(s1);
	if (!s2)
	{
	    scp = sub_context_new();
	    sub_var_set_string(scp, "File_Name", wl.string[j]);
	    change_error(cp, scp, i18n("$filename unrelated"));
	    sub_context_delete(scp);
	    ++number_of_errors;
	    continue;
	}
	change_file_directory_query(cp, s2, &wl_in, 0);
	if (wl_in.nstrings)
	{
	    int		    used;

	    /*
	     * If the user named a directory, add all of the
	     * source files in this change in that
	     * directory, provided they were added using
	     * the aemv command.
	     */
	    used = 0;
	    for (k = 0; k < wl_in.nstrings; ++k)
	    {
		string_ty	*s3;
		fstate_src_ty   *src_data;

		s3 = wl_in.string[k];
		src_data = change_file_find(cp, s3);
		assert(src_data);
		if (src_data && src_data->move)
		{
		    if (string_list_member(&wl2, s3))
		    {
			scp = sub_context_new();
			sub_var_set_string(scp, "File_Name", s3);
			change_error(cp, scp, i18n("too many $filename"));
			sub_context_delete(scp);
			++number_of_errors;
		    }
		    else
			string_list_append(&wl2, s3);
		    if (change_file_is_config(cp, s3))
			++config_seen;
		    ++used;
		}
	    }
	    if (!used)
	    {
		scp = sub_context_new();
		if (s2->str_length)
		    sub_var_set_string(scp, "File_Name", s2);
		else
		    sub_var_set_charstar(scp, "File_Name", ".");
		sub_var_set_long(scp, "Number", (long)wl_in.nstrings);
		sub_var_optional(scp, "Number");
		change_error
		(
		    cp,
		    scp,
		    i18n("directory $filename contains no relevant files")
		);
		sub_context_delete(scp);
		++number_of_errors;
	    }
	}
	else
	{
	    if (string_list_member(&wl2, s2))
	    {
		scp = sub_context_new();
		sub_var_set_string(scp, "File_Name", s2);
		change_error(cp, scp, i18n("too many $filename"));
		sub_context_delete(scp);
		++number_of_errors;
	    }
	    else
		string_list_append(&wl2, s2);
	    if (change_file_is_config(cp, s2))
		++config_seen;
	}
	string_list_destructor(&wl_in);
	str_free(s2);
    }
    string_list_destructor(&wl);
    wl = wl2;
    string_list_destructor(&search_path);

    /*
     * ensure that each file
     * 1. is already part of the change
     * 2. is being moved by this change
     */
    for (j = 0; j < wl.nstrings; ++j)
    {
	fstate_src_ty   *src_data;

	s1 = wl.string[j];
	src_data = change_file_find(cp, s1);
	if (!src_data)
	{
	    scp = sub_context_new();
	    src_data = change_file_find_fuzzy(cp, s1);
	    sub_var_set_string(scp, "File_Name", s1);
	    if (src_data)
	    {
		sub_var_set_string(scp, "Guess", src_data->file_name);
		change_error(cp, scp, i18n("no $filename, closest is $guess"));
	    }
	    else
		change_error(cp, scp, i18n("no $filename"));
	    sub_context_delete(scp);
	    ++number_of_errors;
	    continue;
	}
	if (src_data->move)
	{
	    /*
	     * Add the other half of the move,
	     * if it isn't there already.
	     */
	    string_list_append_unique(&wl, src_data->move);
	}
	else
	{
	    /*
	     * If there is no "other half", then it
	     * wasn't added to the change as a file move,
	     * so complain.
	     */
	    scp = sub_context_new();
	    sub_var_set_string(scp, "File_Name", s1);
	    change_error(cp, scp, i18n("bad mv undo $filename"));
	    sub_context_delete(scp);
	    ++number_of_errors;
	    continue;
	}
	if (config_seen && src_data->file_fp)
	{
	    fingerprint_type.free(src_data->file_fp);
	    src_data->file_fp = 0;
	}
    }
    if (number_of_errors)
    {
	scp = sub_context_new();
	sub_var_set_long(scp, "Number", number_of_errors);
	sub_var_optional(scp, "Number");
	change_fatal(cp, scp, i18n("no files uncopied"));
	sub_context_delete(scp);
    }

    /*
     * Figure out if we need to mend symlinks as we go.
     */
    pconf_data = change_pconf_get(cp, 0);
    mend_symlinks =
	(
	    pconf_data->create_symlinks_before_build
	&&
	    !pconf_data->remove_symlinks_after_build
	);

    /*
     * Remove each file from the development directory,
     * if it still exists.
     * Remove the difference file, too.
     */
    for (j = 0; j < wl.nstrings; ++j)
    {
	int		exists;

	s1 = wl.string[j];
	s2 = change_file_path(cp, s1);
	assert(s2);
	user_become(up);
	exists = os_exists(s2);
	user_become_undo();

	/*
	 * delete the file if it exists
	 * and the user wants us to
	 */
	if (exists && user_delete_file_query(up, s1, 0))
	{
	    fstate_src_ty   *psrc_data;

	    if (mend_symlinks)
		psrc_data = project_file_find(pp, s1, view_path_extreme);
	    else
		psrc_data = 0;

	    if (psrc_data)
	    {
		string_ty	*blf;

		/*
		 * This is not as robust in the face of
		 * errors as using commit.  Its merit
		 * is its simplicity.
		 *
		 * Also, the rename-and-delete shenanigans
		 * take a long time over NFS, and users
		 * expect this to be fast.
		 */
		blf = project_file_path(pp, s1);
		assert(blf);
		user_become(up);
		os_unlink(s2);
		os_symlink(blf, s2);
		user_become_undo();
		str_free(blf);
	    }
	    else
	    {
		user_become(up);
		commit_unlink_errok(s2);
		user_become_undo();
	    }
	}

	/*
	 * always delete the difference file
	 * and the merge backup file
	 */
	user_become(up);
	s1 = str_format("%S,D", s2);
	if (os_exists(s1))
	    commit_unlink_errok(s1);
	str_free(s1);

	/*
	 * always delete the backup merge file
	 */
	s1 = str_format("%S,B", s2);
	if (os_exists(s1))
	    commit_unlink_errok(s1);
	str_free(s1);
	user_become_undo();
	str_free(s2);
    }

    /*
     * Remove each file from the change file,
     * and write it back out.
     */
    string_list_constructor(&wl_nfu);
    string_list_constructor(&wl_ntu);
    string_list_constructor(&wl_rmu);
    for (j = 0; j < wl.nstrings; ++j)
    {
	string_ty	*s;
	fstate_src_ty   *c_src;

	s = wl.string[j];
	c_src = change_file_find(cp, s);
	assert(c_src);
	if (!c_src)
	    continue;
	switch (c_src->action)
	{
	case file_action_create:
	    switch (c_src->usage)
	    {
	    case file_usage_test:
	    case file_usage_manual_test:
		string_list_append(&wl_ntu, s);
		break;

	    case file_usage_source:
	    case file_usage_config:
	    case file_usage_build:
		string_list_append(&wl_nfu, s);
		break;
	    }
	    break;

	case file_action_modify:
	case file_action_remove:
	case file_action_insulate:
	case file_action_transparent:
#ifndef DEBUG
	default:
#endif
	    string_list_append(&wl_rmu, s);
	    break;
	}
	change_file_remove(cp, s);
    }

    /*
     * the number of files changed,
     * so stomp on the validation fields.
     */
    change_build_times_clear(cp);

    /*
     * run the change file command
     * and the project file command if necessary
     */
    if (wl_nfu.nstrings)
	change_run_new_file_undo_command(cp, &wl_nfu, up);
    if (wl_ntu.nstrings)
	change_run_new_file_undo_command(cp, &wl_ntu, up);
    if (wl_rmu.nstrings)
	change_run_remove_file_undo_command(cp, &wl_rmu, up);
    change_run_project_file_command(cp, up);
    string_list_destructor(&wl_nfu);
    string_list_destructor(&wl_ntu);
    string_list_destructor(&wl_rmu);

    /*
     * release the locks
     */
    change_cstate_write(cp);
    commit();
    lock_release();

    /*
     * verbose success message
     */
    for (j = 0; j < wl.nstrings; ++j)
    {
	scp = sub_context_new();
	sub_var_set_string(scp, "File_Name", wl.string[j]);
	change_verbose(cp, scp, i18n("move file undo $filename complete"));
	sub_context_delete(scp);
    }

    string_list_destructor(&wl);
    project_free(pp);
    change_free(cp);
    user_free(up);
    trace(("}\n"));
}


void
move_file_undo(void)
{
    trace(("move_file_undo()\n{\n"));
    switch (arglex())
    {
    default:
	move_file_undo_main();
	break;

    case arglex_token_help:
	move_file_undo_help();
	break;

    case arglex_token_list:
	move_file_undo_list();
	break;
    }
    trace(("}\n"));
}
