//
//	aegis - project change supervisor
//	Copyright (C) 2002-2008 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/stdio.h>

#include <common/error.h>
#include <common/progname.h>
#include <common/quit.h>
#include <common/str_list.h>
#include <common/trace.h>
#include <libaegis/ael/project/files.h>
#include <libaegis/arglex/change.h>
#include <libaegis/arglex/project.h>
#include <libaegis/arglex2.h>
#include <libaegis/change.h>
#include <libaegis/change/branch.h>
#include <libaegis/change/file.h>
#include <libaegis/change/identifier.h>
#include <libaegis/commit.h>
#include <libaegis/file.h>
#include <libaegis/help.h>
#include <libaegis/lock.h>
#include <libaegis/log.h>
#include <libaegis/os.h>
#include <libaegis/project.h>
#include <libaegis/project/file.h>
#include <libaegis/sub.h>
#include <libaegis/user.h>

#include <aegis/aemt.h>


//
// NAME
//	make_transparent_usage
//
// SYNOPSIS
//	void make_transparent_usage(void);
//
// DESCRIPTION
//	The make_transparent_usage function is used to
//	tell the user how to use the 'aegis -Make_Transparent' command.
//

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

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


//
// NAME
//	make_transparent_help
//
// SYNOPSIS
//	void make_transparent_help(void);
//
// DESCRIPTION
//	The make_transparent_help function is used to
//	describe the 'aegis -Make_Transparent' command to the user.
//

static void
make_transparent_help(void)
{
    help("aemt", make_transparent_usage);
}


//
// NAME
//	make_transparent_list
//
// SYNOPSIS
//	void make_transparent_list(void);
//
// DESCRIPTION
//	The make_transparent_list function is used to
//	list the file the user may wish to add to the change
//	as a transparency.  All project files are listed.
//

static void
make_transparent_list(void)
{
    trace(("make_transparent_list()\n{\n"));
    arglex();
    change_identifier cid;
    cid.command_line_parse_rest(make_transparent_usage);
    list_project_files(cid, 0);
    trace(("}\n"));
}


//
// NAME
//	make_transparent_main
//
// SYNOPSIS
//	void make_transparent_main(void);
//
// DESCRIPTION
//	The make_transparent_main function is used to add a file to a
//	change as a transparency (like aecpu for a branch).  The file
//	will be elided from the branch on successful integration of
//	the change.
//
//	The names of the relevant files are gleaned from the command line.
//

static void
make_transparent_main(void)
{
    string_ty	    *s1;
    string_ty	    *s2;
    fstate_src_ty   *c_src_data;
    fstate_src_ty   *b_src_data;
    size_t	    j;
    size_t	    k;
    string_ty	    *project_name;
    project_ty	    *pp;
    long	    change_number;
    change::pointer cp;
    change::pointer bcp;
    log_style_ty    log_style;
    user_ty::pointer up;
    string_ty	    *dd;
    int		    number_of_errors;
    string_list_ty  search_path;
    int		    based;
    string_ty	    *base;
    sub_context_ty  *scp;
    int             unchanged;

    trace(("make_transparent_main()\n{\n"));
    arglex();
    project_name = 0;
    change_number = 0;
    string_list_ty wl;
    log_style = log_style_append_default;
    unchanged = 0;
    while (arglex_token != arglex_token_eoln)
    {
	switch (arglex_token)
	{
	default:
	    generic_argument(make_transparent_usage);
	    continue;

	case arglex_token_file:
	case arglex_token_directory:
	    if (arglex() != arglex_token_string)
		make_transparent_usage();
	    // fall through...

	case arglex_token_string:
	    s2 = str_from_c(arglex_value.alv_string);
	    wl.push_back(s2);
	    str_free(s2);
	    break;

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

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

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

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

	case arglex_token_unchanged:
	    if (unchanged)
		duplicate_option(make_transparent_usage);
	    unchanged = 1;
	    break;

	case arglex_token_wait:
	case arglex_token_wait_not:
	    user_ty::lock_wait_argument(make_transparent_usage);
	    break;

	case arglex_token_whiteout:
	case arglex_token_whiteout_not:
	    user_ty::whiteout_argument(make_transparent_usage);
	    break;

	case arglex_token_base_relative:
	case arglex_token_current_relative:
	    user_ty::relative_filename_preference_argument
            (
                make_transparent_usage
            );
	    break;
	}
	arglex();
    }
    if (!unchanged && !wl.nstrings)
    {
	error_intl(0, i18n("no file names"));
	make_transparent_usage();
    }

    //
    // locate project data
    //
    if (!project_name)
    {
        nstring n = user_ty::create()->default_project();
	project_name = str_copy(n.get_ref());
    }
    pp = project_alloc(project_name);
    str_free(project_name);
    pp->bind_existing();

    //
    // locate user data
    //
    up = user_ty::create();

    //
    // locate change data
    //
    if (!change_number)
	change_number = up->default_change(pp);
    cp = change_alloc(pp, change_number);
    change_bind_existing(cp);

    //
    // take the locks and read the change state
    //
    change_cstate_lock_prepare(cp);
    lock_take();

    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 (!cp->is_being_developed())
	change_fatal(cp, 0, i18n("make transparent bad state"));
    if (change_is_a_branch(cp))
	change_fatal(cp, 0, i18n("bad nf branch"));
    if (nstring(change_developer_name(cp)) != up->name())
	change_fatal(cp, 0, i18n("not developer"));

    //
    // If no files were named and the -unchanged option was used,
    // add all of the project's unchanged files in the change.
    // It is an error if there are none.
    //
    if (!wl.nstrings)
	wl.push_back(change_development_directory_get(cp, 1));

    //
    // Where to search to resolve file names.
    //
    change_search_path_get(cp, &search_path, 1);

    //
    // Find the base for relative filenames.
    //
    based =
	(
	    search_path.nstrings >= 1
	&&
	    (
		up->relative_filename_preference
		(
		    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();
    }

    //
    // 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
    //
    bcp = pp->change_get();
    number_of_errors = 0;
    string_list_ty wl2;
    for (j = 0; j < wl.nstrings; ++j)
    {
	s1 = wl.string[j];
	if (s1->str_text[0] == '/')
	    s2 = str_copy(s1);
	else
	    s2 = os_path_join(base, s1);
	up->become_begin();
	s1 = os_pathname(s2, 1);
	up->become_end();
	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;
	}
	string_list_ty wl_in;
	change_file_directory_query(bcp, s2, &wl_in, 0);
	if (wl_in.nstrings)
	{
	    int		    used;

	    //
	    // If the user named a directory, add all of the
	    // source files in that directory, provided they
	    // are not already in the change.
	    //
	    used = 0;
	    for (k = 0; k < wl_in.nstrings; ++k)
	    {
		string_ty	*s3;

		s3 = wl_in.string[k];
		if (!change_file_find(cp, s3, view_path_first))
		{
		    if (wl2.member(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
			wl2.push_back(s3);
		    ++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 (wl2.member(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
		wl2.push_back(s2);
	}
	str_free(s2);
    }
    wl = wl2;

    //
    // ensure that each file
    // 1. is not already part of the change
    // 2. is being modified or removed by the branch
    // add it to the change
    //
    for (j = 0; j < wl.nstrings; ++j)
    {
	fstate_src_ty   *pp_src_data;

	s1 = wl.string[j];
	trace(("s1 = \"%s\"\n", s1->str_text));
	if (change_file_find(cp, s1, view_path_first))
	{
	    scp = sub_context_new();
	    sub_var_set_string(scp, "File_Name", s1);
	    change_error(cp, scp, i18n("file $filename dup"));
	    sub_context_delete(scp);
	    ++number_of_errors;
	    continue;
	}
	b_src_data = change_file_find(bcp, s1, view_path_first);
	if (!b_src_data)
	{
	    b_src_data = change_file_find_fuzzy(bcp, s1);
	    if (b_src_data)
	    {
		scp = sub_context_new();
		sub_var_set_string(scp, "File_Name", s1);
		sub_var_set_string(scp, "Guess", b_src_data->file_name);
		change_error(bcp, scp, i18n("no $filename, closest is $guess"));
		sub_context_delete(scp);
		++number_of_errors;
	    }
	    else
	    {
		scp = sub_context_new();
		sub_var_set_string(scp, "File_Name", s1);
		if
		(
		    !pp->is_a_trunk()
		&&
		    project_file_find(pp->parent_get(), s1, view_path_simple)
		)
		{
		    project_error
		    (
			pp->parent_get(),
			scp,
			i18n("make $filename transparent, fail, too deep")
		    );
		}
		else
		{
		    change_error(bcp, scp, i18n("no $filename"));
		}
		sub_context_delete(scp);
		++number_of_errors;
		continue;
	    }
	}
	assert(b_src_data);

	pp_src_data = 0;
	switch (b_src_data->action)
	{
	case file_action_create:
	case file_action_modify:
	case file_action_remove:
	    if (pp->is_a_trunk())
	    {
		if (unchanged)
		{
		    trace(("not this one\n"));
		    continue;
		}

		//
		// You may not make a trunk file transparent.
		// What would you see through it?
		//
		scp = sub_context_new();
		sub_var_set_string(scp, "File_Name", s1);
		change_error
		(
		    cp,
		    scp,
		    i18n("make $filename transparent, fail, trunk")
		);
		sub_context_delete(scp);
		++number_of_errors;
		continue;
	    }

	    pp_src_data =
		project_file_find(pp->parent_get(), s1, view_path_simple);
	    if (!pp_src_data)
	    {
		if (unchanged)
		{
		    trace(("not this one\n"));
		    continue;
		}
		scp = sub_context_new();
		sub_var_set_string(scp, "File_Name", s1);
		project_error
		(
		    pp->parent_get(),
		    scp,
		    i18n("make $filename transparent, fail, too shallow")
		);
		sub_context_delete(scp);
		++number_of_errors;
		continue;
	    }
	    break;

	case file_action_transparent:
	case file_action_insulate:
	    // not possible
	    trace(("not possible\n"));
	    assert(0);
	    continue;
	}
	assert(pp_src_data);

        if (unchanged)
        {
	    //
	    // It isn't sufficient to compare versions strings, because
	    // not everyone configures their history commands to avoid
	    // unnecessary checkins.  We have to actually compare the
	    // two files.
	    //
	    string_ty       *f1_path;
	    int             f1_unlink;
	    string_ty       *f2_path;
	    int             f2_unlink;
	    int             different;

	    trace(("mark\n"));
	    f1_path = project_file_version_path(pp, b_src_data, &f1_unlink);
	    f2_path =
		project_file_version_path
		(
		    pp->parent_get(),
		    pp_src_data,
		    &f2_unlink
		);
	    up->become_begin();
	    different = files_are_different(f1_path, f2_path);
	    if (f1_unlink)
		os_unlink(f1_path);
	    if (f2_unlink)
		os_unlink(f2_path);
	    up->become_end();

	    str_free(f1_path);
	    str_free(f2_path);
	    if (different)
	    {
		trace(("not this one, it's different\n"));
		continue;
	    }
	}

	c_src_data = cp->file_new(pp_src_data);
	c_src_data->action = file_action_transparent;

	//
	// b_src_data->edit_number
	//	The head revision of the branch.
	// b_src_data->edit_number_origin
	//	The version originally copied.
	//
	// c_src_data->edit_number
	//	Not meaningful until after integrate pass.
	// c_src_data->edit_number_origin
	//	The version originally copied.
	// c_src_data->edit_number_origin_new
	//	Updates branch edit_number_origin on
	//	integrate pass.
	//
	assert(b_src_data->edit);
	assert(b_src_data->edit->revision);
	c_src_data->edit_origin = history_version_copy(b_src_data->edit);
    }
    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("remove file fail"));
	// NOTREACHED
	sub_context_delete(scp);
    }

    //
    // Create each file in the development directory.  If the file exists
    // in the grandparent project, copy it from there, otherwise put
    // a whiteout file there.  Create any necessary directories along
    // the way.
    //
    dd = change_development_directory_get(cp, 0);
    for (j = 0; ; ++j)
    {
	fstate_src_ty   *pp_src_data;

	c_src_data = change_file_nth(cp, j, view_path_first);
	if (!c_src_data)
	    break;
	assert(pp->parent_get());
	pp_src_data =
	    project_file_find
	    (
		pp->parent_get(),
		c_src_data->file_name,
		view_path_extreme
	    );
	if (pp_src_data)
	{
	    string_ty       *from;
	    string_ty       *to;
	    int             mode;

	    from = project_file_path(pp->parent_get(), c_src_data->file_name);
	    assert(from);
	    to = os_path_join(dd, c_src_data->file_name);

	    //
	    // copy the file
	    //
            user_ty::become scoped(up);
	    os_mkdir_between(dd, c_src_data->file_name, 02755);
	    if (os_exists(to))
		os_unlink(to);
	    copy_whole_file(from, to, 0);

	    //
	    // set the file mode
	    //
	    mode = 0444;
	    if (pp_src_data->executable)
		mode |= 0111;
	    mode &= ~change_umask(cp);
	    os_chmod(to, mode);

	    //
	    // clean up afterwards
	    //
	    str_free(from);
	    str_free(to);
	}
	else
	{
	    //
	    // Remove any existing file (this cleans up junk, and
	    // breaks the link if we are using symlink trees).
	    //
	    change_file_whiteout_write(cp, c_src_data->file_name, up);
	}
    }

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

    //
    // If the file manifest of the change is altered (e.g. by aenf, aenfu,
    // aecp, aecpu, etc), or the contents of any file is changed, the
    // UUID is cleared.  This is because it is no longer the same change
    // as was received by aedist or aepatch, and the UUID is invalidated.
    //
    change_uuid_clear(cp);

    // remember that we are about to
    bool recent_integration = cp->run_project_file_command_needed();
    if (recent_integration)
        cp->run_project_file_command_done();

    //
    // write the data and release the lock
    //
    change_cstate_write(cp);
    commit();
    lock_release();

    //
    // run the change file command
    // and the project file command if necessary
    //
    cp->run_make_transparent_command(&wl, up);
    if (recent_integration)
        cp->run_project_file_command(up);

    //
    // verbose success message
    //
    scp = sub_context_new();
    sub_var_set_long(scp, "Number", (long)wl.nstrings);
    sub_var_optional(scp, "Number");
    change_verbose(cp, scp, i18n("make transparent complete"));
    sub_context_delete(scp);

    change_free(cp);
    project_free(pp);
    trace(("}\n"));
}


//
// NAME
//	make_transparent
//
// SYNOPSIS
//	void make_transparent(void);
//
// DESCRIPTION
//	The make_transparent function is used to
//	dispatch the 'aegis -Make_Transparent' command to the relevant
//	function to do it's work.
//

void
make_transparent(void)
{
    static arglex_dispatch_ty dispatch[] =
    {
	{ arglex_token_help, make_transparent_help, 0 },
	{ arglex_token_list, make_transparent_list, 0 },
    };

    trace(("make_transparent()\n{\n"));
    arglex_dispatch(dispatch, SIZEOF(dispatch), make_transparent_main);
    trace(("}\n"));
}