#!/usr/bin/perl
#
# This file is part of GNU Stow.
#
# GNU Stow 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.
#
# GNU Stow 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 https://www.gnu.org/licenses/.

#
# Test stowing packages.
#

use strict;
use warnings;

use Test::More tests => 118;
use Test::Output;
use English qw(-no_match_vars);

use Stow::Util qw(canon_path set_debug_level);
use testutil;

init_test_dirs();
cd("$TEST_DIR/target");

my $stow;
my %conflicts;

# Note that each of the following tests use a distinct set of files

#
# stow a simple tree minimally
#
$stow = new_Stow(dir => '../stow');

make_path('../stow/pkg1/bin1');
make_file('../stow/pkg1/bin1/file1');

$stow->plan_stow('pkg1');
$stow->process_tasks();
is_deeply([ $stow->get_conflicts ], [], 'no conflicts with minimal stow');
is(
    readlink('bin1'),
    '../stow/pkg1/bin1',
    => 'minimal stow of a simple tree'
);

#
# stow a simple tree into an existing directory
#
$stow = new_Stow();

make_path('../stow/pkg2/lib2');
make_file('../stow/pkg2/lib2/file2');
make_path('lib2');

$stow->plan_stow('pkg2');
$stow->process_tasks();
is(
    readlink('lib2/file2'),
    '../../stow/pkg2/lib2/file2',
    => 'stow simple tree to existing directory'
);

#
# unfold existing tree
#
$stow = new_Stow();

make_path('../stow/pkg3a/bin3');
make_file('../stow/pkg3a/bin3/file3a');
make_link('bin3' => '../stow/pkg3a/bin3'); # emulate stow

make_path('../stow/pkg3b/bin3');
make_file('../stow/pkg3b/bin3/file3b');

$stow->plan_stow('pkg3b');
$stow->process_tasks();
ok(
    -d 'bin3' &&
    readlink('bin3/file3a') eq '../../stow/pkg3a/bin3/file3a'  &&
    readlink('bin3/file3b') eq '../../stow/pkg3b/bin3/file3b'
    => 'target already has 1 stowed package'
);

#
# Link to a new dir 'bin4' conflicts with existing non-dir so can't
# unfold
#
$stow = new_Stow();

make_file('bin4'); # this is a file but named like a directory
make_path('../stow/pkg4/bin4');
make_file('../stow/pkg4/bin4/file4');

$stow->plan_stow('pkg4');
%conflicts = $stow->get_conflicts();
ok(
    $stow->get_conflict_count == 1 &&
    $conflicts{stow}{pkg4}[0] =~
    qr/existing target is neither a link nor a directory/
    => 'link to new dir bin4 conflicts with existing non-directory'
);

#
# Link to a new dir 'bin4a' conflicts with existing non-dir so can't
# unfold even with --adopt
#
#$stow = new_Stow(adopt => 1);
$stow = new_Stow();

make_file('bin4a'); # this is a file but named like a directory
make_path('../stow/pkg4a/bin4a');
make_file('../stow/pkg4a/bin4a/file4a');

$stow->plan_stow('pkg4a');
%conflicts = $stow->get_conflicts();
ok(
    $stow->get_conflict_count == 1 &&
    $conflicts{stow}{pkg4a}[0] =~
    qr/existing target is neither a link nor a directory/
    => 'link to new dir bin4a conflicts with existing non-directory'
);

#
# Link to files 'file4b' and 'bin4b' conflict with existing files
# without --adopt
#
$stow = new_Stow();

# Populate target
make_file('file4b',       'file4b - version originally in target');
make_path ('bin4b');
make_file('bin4b/file4b', 'bin4b/file4b - version originally in target');

# Populate
make_path ('../stow/pkg4b/bin4b');
make_file('../stow/pkg4b/file4b',       'file4b - version originally in stow package');
make_file('../stow/pkg4b/bin4b/file4b', 'bin4b/file4b - version originally in stow package');

$stow->plan_stow('pkg4b');
%conflicts = $stow->get_conflicts();
is($stow->get_conflict_count, 2 => 'conflict per file');
for my $i (0, 1) {
    like(
        $conflicts{stow}{pkg4b}[$i],
        qr/existing target is neither a link nor a directory/
        => 'link to file4b conflicts with existing non-directory'
    );
}

#
# Link to files 'file4b' and 'bin4b' do not conflict with existing
# files when --adopt is given
#
$stow = new_Stow(adopt => 1);

# Populate target
make_file('file4c',       "file4c - version originally in target\n");
make_path ('bin4c');
make_file('bin4c/file4c', "bin4c/file4c - version originally in target\n");

# Populate
make_path ('../stow/pkg4c/bin4c');
make_file('../stow/pkg4c/file4c',       "file4c - version originally in stow package\n");
make_file('../stow/pkg4c/bin4c/file4c', "bin4c/file4c - version originally in stow package\n");

$stow->plan_stow('pkg4c');
is($stow->get_conflict_count, 0 => 'no conflicts with --adopt');
is($stow->get_tasks, 4 => 'two tasks per file');
$stow->process_tasks();
for my $file ('file4c', 'bin4c/file4c') {
    ok(-l $file, "$file turned into a symlink");
    is(
        readlink $file,
        (index($file, '/') == -1 ? '' : '../' )
        . "../stow/pkg4c/$file" => "$file points to right place"
    );
    is(cat_file($file), "$file - version originally in target\n" => "$file has right contents");
}


#
# Target already exists but is not owned by stow
#
$stow = new_Stow();

make_path('bin5');
make_invalid_link('bin5/file5','../../empty');
make_path('../stow/pkg5/bin5/file5');

$stow->plan_stow('pkg5');
%conflicts = $stow->get_conflicts();
like(
    $conflicts{stow}{pkg5}[-1],
    qr/not owned by stow/
    => 'target already exists but is not owned by stow'
);

#
# Replace existing but invalid target
#
$stow = new_Stow();

make_invalid_link('file6','../stow/path-does-not-exist');
make_path('../stow/pkg6');
make_file('../stow/pkg6/file6');

$stow->plan_stow('pkg6');
$stow->process_tasks();
is(
    readlink('file6'),
    '../stow/pkg6/file6'
    => 'replace existing but invalid target'
);

#
# Target already exists, is owned by stow, but points to a non-directory
# (can't unfold)
#
$stow = new_Stow();
#set_debug_level(4);

make_path('bin7');
make_path('../stow/pkg7a/bin7');
make_file('../stow/pkg7a/bin7/node7');
make_link('bin7/node7','../../stow/pkg7a/bin7/node7');
make_path('../stow/pkg7b/bin7/node7');
make_file('../stow/pkg7b/bin7/node7/file7');

$stow->plan_stow('pkg7b');
%conflicts = $stow->get_conflicts();
like(
    $conflicts{stow}{pkg7b}[-1],
    qr/existing target is stowed to a different package/
    => 'link to new dir conflicts with existing stowed non-directory'
);

#
# stowing directories named 0
#
$stow = new_Stow();

make_path('../stow/pkg8a/0');
make_file('../stow/pkg8a/0/file8a');
make_link('0' => '../stow/pkg8a/0'); # emulate stow

make_path('../stow/pkg8b/0');
make_file('../stow/pkg8b/0/file8b');

$stow->plan_stow('pkg8b');
$stow->process_tasks();
ok(
    $stow->get_conflict_count == 0 &&
    -d '0' &&
    readlink('0/file8a') eq '../../stow/pkg8a/0/file8a'  &&
    readlink('0/file8b') eq '../../stow/pkg8b/0/file8b'
    => 'stowing directories named 0'
);

#
# overriding already stowed documentation
#
$stow = new_Stow(override => ['man9', 'info9']);

make_path('../stow/pkg9a/man9/man1');
make_file('../stow/pkg9a/man9/man1/file9.1');
make_path('man9/man1');
make_link('man9/man1/file9.1' => '../../../stow/pkg9a/man9/man1/file9.1'); # emulate stow

make_path('../stow/pkg9b/man9/man1');
make_file('../stow/pkg9b/man9/man1/file9.1');

$stow->plan_stow('pkg9b');
$stow->process_tasks();
ok(
    $stow->get_conflict_count == 0 &&
    readlink('man9/man1/file9.1') eq '../../../stow/pkg9b/man9/man1/file9.1'
    => 'overriding existing documentation files'
);

#
# deferring to already stowed documentation
#
$stow = new_Stow(defer => ['man10', 'info10']);

make_path('../stow/pkg10a/man10/man1');
make_file('../stow/pkg10a/man10/man1/file10.1');
make_path('man10/man1');
make_link('man10/man1/file10.1' => '../../../stow/pkg10a/man10/man1/file10.1'); # emulate stow

make_path('../stow/pkg10b/man10/man1');
make_file('../stow/pkg10b/man10/man1/file10.1');

$stow->plan_stow('pkg10b');
is($stow->get_tasks, 0, 'no tasks to process');
ok(
    $stow->get_conflict_count == 0 &&
    readlink('man10/man1/file10.1') eq '../../../stow/pkg10a/man10/man1/file10.1'
    => 'defer to existing documentation files'
);

#
# Ignore temp files
#
$stow = new_Stow(ignore => ['~', '\.#.*']);

make_path('../stow/pkg11/man11/man1');
make_file('../stow/pkg11/man11/man1/file11.1');
make_file('../stow/pkg11/man11/man1/file11.1~');
make_file('../stow/pkg11/man11/man1/.#file11.1');
make_path('man11/man1');

$stow->plan_stow('pkg11');
$stow->process_tasks();
ok(
    $stow->get_conflict_count == 0 &&
    readlink('man11/man1/file11.1') eq '../../../stow/pkg11/man11/man1/file11.1' &&
    !-e 'man11/man1/file11.1~' &&
    !-e 'man11/man1/.#file11.1'
    => 'ignore temp files'
);

#
# stowing links library files
#
$stow = new_Stow();

make_path('../stow/pkg12/lib12/');
make_file('../stow/pkg12/lib12/lib.so.1');
make_link('../stow/pkg12/lib12/lib.so', 'lib.so.1');

make_path('lib12/');

$stow->plan_stow('pkg12');
$stow->process_tasks();
ok(
    $stow->get_conflict_count == 0 &&
    readlink('lib12/lib.so.1') eq '../../stow/pkg12/lib12/lib.so.1' &&
    readlink('lib12/lib.so'  ) eq '../../stow/pkg12/lib12/lib.so'
    => 'stow links to libraries'
);

#
# unfolding to stow links to library files
#
$stow = new_Stow();

make_path('../stow/pkg13a/lib13/');
make_file('../stow/pkg13a/lib13/liba.so.1');
make_link('../stow/pkg13a/lib13/liba.so', 'liba.so.1');
make_link('lib13','../stow/pkg13a/lib13');

make_path('../stow/pkg13b/lib13/');
make_file('../stow/pkg13b/lib13/libb.so.1');
make_link('../stow/pkg13b/lib13/libb.so', 'libb.so.1');

$stow->plan_stow('pkg13b');
$stow->process_tasks();
ok(
    $stow->get_conflict_count == 0 &&
    readlink('lib13/liba.so.1') eq '../../stow/pkg13a/lib13/liba.so.1'  &&
    readlink('lib13/liba.so'  ) eq '../../stow/pkg13a/lib13/liba.so'    &&
    readlink('lib13/libb.so.1') eq '../../stow/pkg13b/lib13/libb.so.1'  &&
    readlink('lib13/libb.so'  ) eq '../../stow/pkg13b/lib13/libb.so'
    => 'unfolding to stow links to libraries'
);

#
# stowing to stow dir should fail
#
make_path('stow');
$stow = new_Stow(dir => 'stow');

make_path('stow/pkg14/stow/pkg15');
make_file('stow/pkg14/stow/pkg15/node15');

capture_stderr();
$stow->plan_stow('pkg14');
is($stow->get_tasks, 0, 'no tasks to process');
ok(
    $stow->get_conflict_count == 0 &&
    ! -l 'stow/pkg15'
    => "stowing to stow dir should fail"
);
like($stderr,
     qr/WARNING: skipping target which was current stow directory stow/
     => "stowing to stow dir should give warning");
uncapture_stderr();

#
# stow a simple tree minimally when cwd isn't target
#
cd('../..');
$stow = new_Stow(dir => "$TEST_DIR/stow", target => "$TEST_DIR/target");

make_path("$TEST_DIR/stow/pkg16/bin16");
make_file("$TEST_DIR/stow/pkg16/bin16/file16");

$stow->plan_stow('pkg16');
$stow->process_tasks();
is_deeply([ $stow->get_conflicts ], [], 'no conflicts with minimal stow');
is(
    readlink("$TEST_DIR/target/bin16"),
    '../stow/pkg16/bin16',
    => "minimal stow of a simple tree when cwd isn't target"
);

#
# stow a simple tree minimally to absolute stow dir when cwd isn't
# target
#
$stow = new_Stow(dir    => canon_path("$TEST_DIR/stow"),
                 target => "$TEST_DIR/target");

make_path("$TEST_DIR/stow/pkg17/bin17");
make_file("$TEST_DIR/stow/pkg17/bin17/file17");

$stow->plan_stow('pkg17');
$stow->process_tasks();
is_deeply([ $stow->get_conflicts ], [], 'no conflicts with minimal stow');
is(
    readlink("$TEST_DIR/target/bin17"),
    '../stow/pkg17/bin17',
    => "minimal stow of a simple tree with absolute stow dir"
);

#
# stow a simple tree minimally with absolute stow AND target dirs when
# cwd isn't target
#
$stow = new_Stow(dir    => canon_path("$TEST_DIR/stow"),
                 target => canon_path("$TEST_DIR/target"));

make_path("$TEST_DIR/stow/pkg18/bin18");
make_file("$TEST_DIR/stow/pkg18/bin18/file18");

$stow->plan_stow('pkg18');
$stow->process_tasks();
is_deeply([ $stow->get_conflicts ], [], 'no conflicts with minimal stow');
is(
    readlink("$TEST_DIR/target/bin18"),
    '../stow/pkg18/bin18',
    => "minimal stow of a simple tree with absolute stow and target dirs"
);

#
# stow a tree with no-folding enabled -
# no new folded directories should be created, and existing
# folded directories should be split open (unfolded) where
# (and only where) necessary
#
cd("$TEST_DIR/target");

sub create_pkg {
    my ($id, $pkg) = @_;

    my $stow_pkg = "../stow/$id-$pkg";
    make_path ($stow_pkg);
    make_file("$stow_pkg/$id-file-$pkg");

    # create a shallow hierarchy specific to this package which isn't
    # yet stowed
    make_path ("$stow_pkg/$id-$pkg-only-new");
    make_file("$stow_pkg/$id-$pkg-only-new/$id-file-$pkg");

    # create a deeper hierarchy specific to this package which isn't
    # yet stowed
    make_path ("$stow_pkg/$id-$pkg-only-new2/subdir");
    make_file("$stow_pkg/$id-$pkg-only-new2/subdir/$id-file-$pkg");
    make_link("$stow_pkg/$id-$pkg-only-new2/current", "subdir");

    # create a hierarchy specific to this package which is already
    # stowed via a folded tree
    make_path ("$stow_pkg/$id-$pkg-only-old");
    make_link("$id-$pkg-only-old", "$stow_pkg/$id-$pkg-only-old");
    make_file("$stow_pkg/$id-$pkg-only-old/$id-file-$pkg");

    # create a shared hierarchy which this package uses
    make_path ("$stow_pkg/$id-shared");
    make_file("$stow_pkg/$id-shared/$id-file-$pkg");

    # create a partially shared hierarchy which this package uses
    make_path ("$stow_pkg/$id-shared2/subdir-$pkg");
    make_file("$stow_pkg/$id-shared2/$id-file-$pkg");
    make_file("$stow_pkg/$id-shared2/subdir-$pkg/$id-file-$pkg");
}

foreach my $pkg (qw{a b}) {
    create_pkg('no-folding', $pkg);
}

$stow = new_Stow('no-folding' => 1);
$stow->plan_stow('no-folding-a');
is_deeply([ $stow->get_conflicts ], [] => 'no conflicts with --no-folding');
my @tasks = $stow->get_tasks;
use Data::Dumper;
is(scalar(@tasks), 13 => "6 dirs, 7 links") || warn Dumper(\@tasks);
$stow->process_tasks();

sub check_no_folding {
    my ($pkg) = @_;
    my $stow_pkg = "../stow/no-folding-$pkg";
    is_link("no-folding-file-$pkg", "$stow_pkg/no-folding-file-$pkg");

    # check existing folded tree is untouched
    is_link("no-folding-$pkg-only-old", "$stow_pkg/no-folding-$pkg-only-old");

    # check newly stowed shallow tree is not folded
    is_dir_not_symlink("no-folding-$pkg-only-new");
    is_link("no-folding-$pkg-only-new/no-folding-file-$pkg",
            "../$stow_pkg/no-folding-$pkg-only-new/no-folding-file-$pkg");

    # check newly stowed deeper tree is not folded
    is_dir_not_symlink("no-folding-$pkg-only-new2");
    is_dir_not_symlink("no-folding-$pkg-only-new2/subdir");
    is_link("no-folding-$pkg-only-new2/subdir/no-folding-file-$pkg",
            "../../$stow_pkg/no-folding-$pkg-only-new2/subdir/no-folding-file-$pkg");
    is_link("no-folding-$pkg-only-new2/current",
            "../$stow_pkg/no-folding-$pkg-only-new2/current");

    # check shared tree is not folded. first time round this will be
    # newly stowed.
    is_dir_not_symlink('no-folding-shared');
    is_link("no-folding-shared/no-folding-file-$pkg",
            "../$stow_pkg/no-folding-shared/no-folding-file-$pkg");

    # check partially shared tree is not folded. first time round this
    # will be newly stowed.
    is_dir_not_symlink('no-folding-shared2');
    is_link("no-folding-shared2/no-folding-file-$pkg",
            "../$stow_pkg/no-folding-shared2/no-folding-file-$pkg");
    is_link("no-folding-shared2/no-folding-file-$pkg",
            "../$stow_pkg/no-folding-shared2/no-folding-file-$pkg");
}

check_no_folding('a');

$stow = new_Stow('no-folding' => 1);
$stow->plan_stow('no-folding-b');
is_deeply([ $stow->get_conflicts ], [] => 'no conflicts with --no-folding');
@tasks = $stow->get_tasks;
is(scalar(@tasks), 11 => '4 dirs, 7 links') || warn Dumper(\@tasks);
$stow->process_tasks();

check_no_folding('a');
check_no_folding('b');