package Pear::LocalLoop::Controller::Admin::Import;
use Mojo::Base 'Mojolicious::Controller';

use Text::CSV;
use Try::Tiny;

has result_set => sub {
    my $c = shift;
    return $c->schema->resultset('ImportSet');
};

sub idx {
    my $c = shift;

    my $import_rs = $c->result_set->search(
        undef,
        {
            page     => $c->param('page') || 1,
            rows     => 10,
            order_by => { -desc => 'date' },
        },
    );
    $c->stash( import_rs => $import_rs );
    
    return 1;
}

sub list {
    my $c      = shift;
    my $set_id = $c->param('set_id');

    my $include_ignored  = $c->param('ignored');
    my $include_imported = $c->param('imported');

    my $import_set      = $c->result_set->find($set_id);
    my $import_value_rs = $c->result_set->get_values( $set_id, $include_ignored,
        $include_imported );
    my $import_users_rs =
      $c->result_set->get_users( $set_id, $include_ignored, $include_imported );
    my $import_org_rs =
      $c->result_set->get_orgs( $set_id, $include_ignored, $include_imported );
    my $import_lookup_rs = $c->result_set->get_lookups($set_id);

    $c->stash(
        import_set       => $import_set,
        import_value_rs  => $import_value_rs,
        import_users_rs  => $import_users_rs,
        import_org_rs    => $import_org_rs,
        import_lookup_rs => $import_lookup_rs,
    );
    
    return 1;
}

sub get_add {
    my $c = shift;
    
    return 1;
}

sub post_add {
    my $c = shift;

    my $csv_data    = $c->param('csv');
    my $date_format = $c->param('date_format');

    my $csv = Text::CSV->new(
        {
            binary           => 1,
            allow_whitespace => 1,
        }
    );

    open my $fh, '<', \$csv_data;

    # List context returns the actual headers
    my @csv_headers;
    my $error;
    try {
        @csv_headers = $csv->header($fh);
    }
    catch {
        $error = $_;
    };

    if ( defined $error ) {
        $c->_csv_flash_error($error);
        $c->redirect_to('/admin/import/add');
        return;
    }

    # Text::CSV Already errors on duplicate columns, so this is fine
    my @required = grep { /^user$|^value$|^date$|^organisation$/ } @csv_headers;

    unless ( scalar(@required) == 4 ) {
        $c->_csv_flash_error('Required columns not available');
        $c->redirect_to('/admin/import/add');
        return;
    }

    my $csv_output = $csv->getline_hr_all($fh);

    unless ( scalar(@$csv_output) ) {
        $c->_csv_flash_error("No data found");
        $c->redirect_to('/admin/import/add');
        return;
    }

    for my $data (@$csv_output) {
        for my $key (qw/ user value organisation /) {
            unless ( defined $data->{$key} ) {
                $c->_csv_flash_error("Undefined [$key] data found");
                $c->redirect_to('/admin/import/add');
                return;
            }
        }
        if ( defined $data->{date} ) {
            my $dtp =
              DateTime::Format::Strptime->new( pattern => $date_format );
            my $dt_obj = $dtp->parse_datetime( $data->{date} );
            unless ( defined $dt_obj ) {
                $c->_csv_flash_error(
                    "Undefined or incorrect format for [date] data found");
                $c->redirect_to('/admin/import/add');
                return;
            }
            $data->{date} = $dt_obj;
        }
    }

    my $value_set;
    $c->schema->txn_do(
        sub {
            $value_set = $c->result_set->create( {} );

            $value_set->values->populate(
                [
                    [qw/ user_name purchase_value purchase_date org_name /],
                    (
                        map { [ @{$_}{qw/ user value date organisation /} ] }
                          @$csv_output
                    ),
                ]
            );
        }
    );

    unless ( defined $value_set ) {
        $c->_csv_flash_error('Error creating new Value Set');
        $c->redirect_to('/admin/import/add');
        return;
    }

    $c->flash( success => 'Created Value Set' );
    $c->redirect_to( '/admin/import/' . $value_set->id );
    
    return 1;
}

sub _csv_flash_error {
    my ( $c, $error ) = @_;
    $error //= "An error occurred";

    $c->flash(
        error => $error,

        # If csv info is huge, this fails epically
        #csv_data => $c->param('csv'),
        date_format => $c->param('date_format'),
    );
    
    return 1;
}

sub get_user {
    my $c         = shift;
    my $set_id    = $c->param('set_id');
    my $user_name = $c->param('user');

    my $values_rs = $c->result_set->find($set_id)->values->search(
        {
            user_name    => $user_name,
            ignore_value => 0,
        }
    );

    unless ( $values_rs->count > 0 ) {
        $c->flash( error => 'User not found or all values are ignored' );
        return $c->redirect_to( '/admin/import/' . $set_id );
    }

    my $lookup_result =
      $c->result_set->find($set_id)->lookups->find( { name => $user_name }, );

    my $entity_id = $c->param('entity');

    my $users_rs = $c->schema->resultset('User');

    if ( defined $entity_id && $users_rs->find( { entity_id => $entity_id } ) )
    {
        if ( defined $lookup_result ) {
            $lookup_result->update( { entity_id => $entity_id } );
        }
        else {
            $lookup_result = $c->result_set->find($set_id)->lookups->create(
                {
                    name      => $user_name,
                    entity_id => $entity_id,
                },
            );
        }
    }
    elsif ( defined $entity_id ) {
        $c->stash( error => "User does not exist" );
    }

    $c->stash(
        users_rs  => $users_rs,
        lookup    => $lookup_result,
        user_name => $user_name,
    );
    
    return 1;
}

sub get_org {
    my $c        = shift;
    my $set_id   = $c->param('set_id');
    my $org_name = $c->param('org');

    my $values_rs = $c->result_set->find($set_id)->values->search(
        {
            org_name     => $org_name,
            ignore_value => 0,
        }
    );

    unless ( $values_rs->count > 0 ) {
        $c->flash(
            error => 'Organisation not found or all values are ignored' );
        return $c->redirect_to( '/admin/import/' . $set_id );
    }

    my $lookup_result =
      $c->result_set->find($set_id)->lookups->find( { name => $org_name }, );

    my $entity_id = $c->param('entity');

    my $orgs_rs = $c->schema->resultset('Organisation');

    if ( defined $entity_id && $orgs_rs->find( { entity_id => $entity_id } ) ) {
        if ( defined $lookup_result ) {
            $lookup_result->update( { entity_id => $entity_id } );
        }
        else {
            $lookup_result = $c->result_set->find($set_id)->lookups->create(
                {
                    name      => $org_name,
                    entity_id => $entity_id,
                },
            );
        }
    }
    elsif ( defined $entity_id ) {
        $c->stash( error => "Organisation does not exist" );
    }

    $c->stash(
        orgs_rs  => $orgs_rs,
        lookup   => $lookup_result,
        org_name => $org_name,
    );
    
    return 1;
}

sub ignore_value {
    my $c        = shift;
    my $set_id   = $c->param('set_id');
    my $value_id = $c->param('value_id');

    my $set_result = $c->result_set->find($set_id);
    unless ( defined $set_result ) {
        $c->flash( error => "Set does not exist" );
        return $c->redirect_to('/admin/import');
    }

    my $value_result = $set_result->values->find($value_id);
    unless ( defined $value_result ) {
        $c->flash( error => "Value does not exist" );
        return $c->redirect_to( '/admin/import/' . $set_id );
    }

    $value_result->update(
        { ignore_value => $value_result->ignore_value ? 0 : 1 } );

    $c->flash( success => "Updated value" );
    my $referer = $c->req->headers->header('Referer');
    return $c->redirect_to(
        defined $referer
        ? $c->url_for($referer)->path_query
        : '/admin/import/' . $set_id
    );
}

sub run_import {
    my $c      = shift;
    my $set_id = $c->param('set_id');

    my $set_result = $c->result_set->find($set_id);
    unless ( defined $set_result ) {
        $c->flash( error => "Set does not exist" );
        return $c->redirect_to('/admin/import');
    }

    my $import_value_rs = $c->result_set->get_values( $set_id, undef, undef );
    my $import_lookup   = $c->result_set->get_lookups($set_id);
    my $entity_rs       = $c->schema->resultset('Entity');

    $c->schema->txn_do(
        sub {
            for my $value_result ( $import_value_rs->all ) {
                my $user_lookup = $import_lookup->{ $value_result->user_name };
                my $org_lookup  = $import_lookup->{ $value_result->org_name };
                my $value_lookup =
                  $c->parse_currency( $value_result->purchase_value );

                if (   defined $user_lookup
                    && defined $org_lookup
                    && $value_lookup )
                {
                    my $user_entity =
                      $entity_rs->find( $user_lookup->{entity_id} );
                    my $org_entity =
                      $entity_rs->find( $org_lookup->{entity_id} );
                    my $distance =
                      $c->get_distance_from_coords( $user_entity->type_object,
                        $org_entity->type_object );
                    my $transaction =
                      $c->schema->resultset('Transaction')->create(
                        {
                            buyer         => $user_entity,
                            seller        => $org_entity,
                            value         => $value_lookup * 100000,
                            purchase_time => $value_result->purchase_date,
                            distance      => $distance,
                        }
                      );
                    $value_result->update(
                        { transaction_id => $transaction->id } );
                }
                else {
                    $c->app->log->warn( "Failed value import for value id ["
                          . $value_result->id
                          . "], ignoring" );
                }
            }
        }
    );

    $c->flash( success => "Import completed for ready values" );
    my $referer = $c->req->headers->header('Referer');
    return $c->redirect_to(
        defined $referer
        ? $c->url_for($referer)->path_query
        : '/admin/import/' . $set_id
    );
}

1;