package App::Sqitch::Role::TargetConfigCommand;

use 5.010;
use strict;
use warnings;
use utf8;
use Moo::Role;
use App::Sqitch::Types qw(HashRef);
use App::Sqitch::X qw(hurl);
use Path::Class;
use Try::Tiny;
use URI::db;
use Locale::TextDomain qw(App-Sqitch);
use List::Util qw(first);
use File::Path qw(make_path);
use namespace::autoclean;
use constant extra_target_keys => ();

our $VERSION = 'v1.3.0'; # VERSION

requires 'command';
requires 'options';
requires 'configure';
requires 'sqitch';
requires 'extra_target_keys';
requires 'default_target';

has properties => (
    is  => 'ro',
    isa => HashRef,
    default => sub { {} },
);

around options => sub {
    my ($orig, $class) = @_;
    return ($class->$orig), (map { "$_=s" } $class->extra_target_keys), qw(
        plan-file|f=s
        registry=s
        client=s
        extension=s
        top-dir=s
        dir|d=s%
        set|s=s%
    );
};

around configure => sub {
    my ( $orig, $class, $config, $opt ) = @_;

    # Grab the options we're responsible for.
    my $props = {};
    for my $key (
        $class->extra_target_keys,
        qw(plan_file registry client extension top_dir dir)
    ) {
        $props->{$key} = delete $opt->{$key} if exists $opt->{$key};
    }

    # Let the command take care of its options.
    my $params = $class->$orig($config, $opt);

    # Convert file option to Class::Path::File object.
    if ( my $file = $props->{plan_file} ) {
        $props->{plan_file} = file($file)->cleanup;
    }

    # Convert directory option to Class::Path::Dir object.
    if ( my $file = $props->{top_dir} ) {
        $props->{top_dir} = dir($file)->cleanup;
    }

    # Convert URI.
    if ( my $uri = $props->{uri} ) {
        require URI;
        $props->{uri} = URI->new($uri);
    }

    # Convert directory properties to Class::Path::Dir objects.
    if (my $dirs = delete $props->{dir}) {
        my %ok_keys = map {; $_ => undef } (
            qw(reworked),
            map { ($_, "reworked_$_") } qw(deploy revert verify)
        );

        my @unknown;
        for my $key (keys %{ $dirs }) {
            unless (exists $ok_keys{$key}) {
                push @unknown => $key;
                next;
            }
            $props->{"$key\_dir"} = dir(delete $dirs->{$key})->cleanup
        }

        if (@unknown) {
            hurl $class->command => __nx(
                'Unknown directory name: {dirs}',
                'Unknown directory names: {dirs}',
                @unknown,
                dirs => join(__ ', ', sort @unknown),
            );
        }
    }

    # Copy variables.
    if ( my $vars = $opt->{set} ) {
        $props->{variables} = $vars;
    }

    # All done.
    $params->{properties} = $props;
    return $params;
};

sub BUILD {
    my $self = shift;
    my $props = $self->properties;

    if (my $engine = $props->{engine}) {
        # Validate engine.
        hurl $self->command => __x(
            'Unknown engine "{engine}"', engine => $engine
        ) unless first { $engine eq $_ } App::Sqitch::Command::ENGINES;
    }

    if (my $uri = $props->{uri}) {
        # Validate URI.
        hurl $self->command => __x(
            'URI "{uri}" is not a database URI',
            uri => $uri,
        ) unless eval { $uri->isa('URI::db') };

        my $engine = $uri->canonical_engine or hurl $self->command => __x(
            'No database engine in URI "{uri}"',
            uri => $uri,
        );
        hurl $self->command => __x(
            'Unknown engine "{engine}" in URI "{uri}"',
            engine => $engine,
            uri    => $uri,
        ) unless first { $engine eq $_ } App::Sqitch::Command::ENGINES;

    }
}

sub config_target {
    my ($self, %p) = @_;
    my $sqitch = $self->sqitch;
    my $props  = $self->properties;
    my @params = (sqitch => $sqitch);

    if (my $name = $p{name} || $props->{target}) {
        push @params => (name => $name);
        if (my $uri = $p{uri}) {
            push @params => (uri => $uri);
        } else {
            my $config = $sqitch->config;
            if ($name !~ /:/ && !$config->get(key => "target.$name.uri")) {
                # No URI. Give it one.
                my $engine = $p{engine} || $props->{engine}
                    || $config->get(key => 'core.engine')
                    || hurl $self->command => __(
                        'No engine specified; specify via target or core.engine'
                    );
                push @params => (uri => URI::db->new("db:$engine:"));
            }
        }
    } elsif (my $engine = $p{engine} || $props->{engine}) {
        my $config = $sqitch->config;
        push @params => (
            name => $config->get(key => "engine.$engine.target")
                 || $config->get(key => 'core.target')
                 || "db:$engine:"
        );
    } else {
        # Get the name and URI from the default target.
        my $default = $self->default_target;
        push @params => (
            name => $default->name,
            uri  => $default->uri,
        );
    }

    # Return the target with all relevant attributes overridden.
    require App::Sqitch::Target;
    return App::Sqitch::Target->new(
        @params,
        map { $_ => $props->{$_} } grep { $props->{$_} } qw(
            top_dir
            plan_file
            registry
            client
            deploy_dir
            revert_dir
            verify_dir
            reworked_dir
            reworked_deploy_dir
            reworked_revert_dir
            reworked_verify_dir
            extension
        )
    );
}

sub directories_for {
    my $self = shift;
    my $props = $self->properties;
    my (@dirs, %seen);

    for my $target (@_) {
        # Script directories.
        if (my $top_dir = $props->{top_dir}) {
            push @dirs => grep { !$seen{$_}++ } map {
                $props->{"$_\_$_"} || $top_dir->subdir($_);
            } qw(deploy revert verify);
        } else {
            push @dirs => grep { !$seen{$_}++ } map {
                my $name = "$_\_dir";
                $props->{$name} || $target->$name;
            } qw(deploy revert verify);
        }

        # Reworked script directories.
        if (my $reworked_dir = $props->{reworked_dir} || $props->{top_dir}) {
            push @dirs => grep { !$seen{$_}++ } map {
                $props->{"reworked_$_\_dir"} || $reworked_dir->subdir($_);
            } qw(deploy revert verify);
        } else {
            push @dirs => grep { !$seen{$_}++ } map {
                my $name = "reworked_$_\_dir";
                $props->{$name} || $target->$name;
            } qw(deploy revert verify);
        }
    }

    return @dirs;
}

sub make_directories_for {
    my $self  = shift;
    $self->mkdirs( $self->directories_for(@_) );
}

sub mkdirs {
    my $self = shift;

    for my $dir (@_) {
        next if -d $dir;
        my $sep = dir('')->stringify; # OS-specific directory separator.
        $self->info(__x(
            'Created {file}',
            file => "$dir$sep"
        )) if make_path $dir, { error => \my $err };
        if ( my $diag = shift @{ $err } ) {
            my ( $path, $msg ) = %{ $diag };
            hurl $self->command => __x(
                'Error creating {path}: {error}',
                path  => $path,
                error => $msg,
            ) if $path;
            hurl $self->command => $msg;
        }
    }

    return $self;
}

sub write_plan {
    my ( $self, %p ) = @_;
    my $project = $p{project};
    my $uri     = $p{uri};
    my $target  = $p{target} || $self->config_target;
    my $file    = $target->plan_file;

    unless ($project && $uri) {
        # Find a plan to copy the project name and URI from.
        my $conf_plan = $target->plan;
        my $def_plan  = $self->default_target->plan;
        if (try { $def_plan->project }) {
            $project ||= $def_plan->project;
            $uri     ||= $def_plan->uri;
        } elsif (try { $conf_plan->project }) {
            $project ||= $conf_plan->project;
            $uri     ||= $conf_plan->uri;
        } else {
            hurl $self->command => __x(
                'Missing %project pragma in {file}',
                file => $file,
            ) unless $project;
        }
    }

    if (-e $file) {
        hurl init => __x(
            'Cannot initialize because {file} already exists and is not a file',
            file => $file,
        ) unless -f $file;

        # Try to load the plan file.
        my $plan = App::Sqitch::Plan->new(
            sqitch => $self->sqitch,
            file   => $file,
            target => $target,
        );
        my $file_proj = try { $plan->project } or hurl init => __x(
            'Cannot initialize because {file} already exists and is not a valid plan file',
            file => $file,
        );

        # Bail if this plan file looks like it's for a different project.
        hurl init => __x(
            'Cannot initialize because project "{project}" already initialized in {file}',
            project => $plan->project,
            file    => $file,
        ) if $plan->project ne $project;
        return $self;
    }

    $self->mkdirs( $file->dir ) unless -d $file->dir;

    my $fh = $file->open('>:utf8_strict') or hurl init => __x(
        'Cannot open {file}: {error}',
        file => $file,
        error => $!,
    );
    require App::Sqitch::Plan;
    $fh->print(
        '%syntax-version=', App::Sqitch::Plan::SYNTAX_VERSION(), "\n",
        '%project=', "$project\n",
        ( $uri ? ('%uri=', $uri->canonical, "\n") : () ), "\n",
    );
    $fh->close or hurl add => __x(
        'Error closing {file}: {error}',
        file  => $file,
        error => $!
    );

    $self->sqitch->info( __x 'Created {file}', file => $file );
    return $self;
}

sub config_params {
    my ($self, $key) = @_;
    my @vars;
    while (my ($prop, $val) = each %{ $self->properties } ) {
        if (ref $val eq 'HASH') {
            push @vars => map {{
                key   => "$key.$prop.$_",
                value => $val->{$_},
            }} keys %{ $val };
        } else {
            push @vars => {
                key   => "$key.$prop",
                value => $val,
            };
        }
    }
    return \@vars;
}

1;

__END__

=head1 Name

App::Sqitch::Role::TargetConfigCommand - A command that handles target-related configuration

=head1 Synopsis

  package App::Sqitch::Command::init;
  extends 'App::Sqitch::Command';
  with 'App::Sqitch::Role::TargetConfigCommand';

=head1 Description

This role encapsulates the common attributes and methods required by commands
that deal with change script configuration, including script directories and
extensions.

=head1 Interface

=head2 Class Methods

=head3 C<options>

  my @opts = App::Sqitch::Command::checkout->options;

Adds options common to the commands that manage script configuration.

=head3 C<configure>

Configures the options common to commands manage script configuration.

=head2 Attributes

=head3 C<properties>

A hash reference of target configurations. The keys may be as follows:

=over

=item C<deploy>

=item C<revert>

=item C<verify>

=item C<reworked>

=item C<reworked_deploy>

=item C<reworked_revert>

=item C<reworked_verify>

=item C<extension>

=back

=head2 Instance Methods

=head3 C<config_target>

  my $target = $cmd->config_target;
  my $target = $cmd->config_target(%params);

Constructs a target based on the contents of C<properties>. The supported
parameters are:

=over

=item C<name>

A target name.

=item C<uri>

A target URI.

=item C<engine>

An engine name.

=back

The passed target and engine names take highest precedence, falling back on
the properties and the C<default_target>. All other properties are applied to
the target before returning it.

=head3 C<write_plan>

  $cmd->write_plan(%params);

Writes out the plan file. Supported parameters are:

=over

=item C<target>

The target for which the plan will be written. Defaults to the target returned
by C<config_target()>.

=item C<project>

The project name. If not passed, the project name will be read from the
default target's plan, if it exists. Otherwise an error will be thrown.

=item C<uri>

The project URI. Optional. If not passed, the URI will be read from the
default target's plan, if it exists. Optional.

=back

=head3 C<directories_for>

  my @dirs = $cmd->directories_for(@targets);

Returns a set of script directories for a list of targets. Options passed to
the command are preferred. Paths are pulled from the command only when they
have not been passed as options.

=head3 C<make_directories_for>

  $cmd->directories_for(@targets);

Creates script directories for one or more targets. Options passed to the
command are preferred. Paths are pulled from the command only when they have
not been passed as options.

=head3 C<mkdirs>

   $cmd->directories_for(@dirs);

Creates the list of directories on the file system. Directories that already
exist are skipped. Messages are sent to C<info()> for each directory, and an
error is thrown on the first to fail.

=head3 C<config_params>

  my @params = $cmd->config_params($key);

Returns a list of parameters to pass to the L<App::Sqitch::Config> C<set>
method, built up from the C<properties>.

=head1 See Also

=over

=item L<App::Sqitch::Command::init>

The C<init> command initializes a Sqitch project, setting up the change script
configuration and directories.

=item L<App::Sqitch::Command::engine>

The C<engine> command manages engine configuration, including engine-specific
change script configuration.

=item L<App::Sqitch::Command::target>

The C<engine> command manages target configuration, including target-specific
change script configuration.

=back

=head1 Author

David E. Wheeler <david@justatheory.com>

=head1 License

Copyright (c) 2012-2022 iovation Inc., David E. Wheeler

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

=cut