package Pear::LocalLoop::Schema::Result::Leaderboard;

use strict;
use warnings;

use base 'DBIx::Class::Core';

use DateTime;

__PACKAGE__->table("leaderboards");

__PACKAGE__->add_columns(
    "id" => {
        data_type         => "integer",
        is_auto_increment => 1,
        is_nullable       => 0,
    },
    "name" => {
        data_type   => "varchar",
        size        => 255,
        is_nullable => 0,
    },
    "type" => {
        data_type   => "varchar",
        size        => 255,
        is_nullable => 0,
    },
);

__PACKAGE__->set_primary_key("id");

__PACKAGE__->add_unique_constraint( ["type"] );

__PACKAGE__->has_many(
    "sets",
    "Pear::LocalLoop::Schema::Result::LeaderboardSet",
    { "foreign.leaderboard_id" => "self.id" },
    { cascade_copy             => 0, cascade_delete => 0 },
);

sub create_new {
    my $self  = shift;
    my $start = shift;

    my $type = $self->type;

    if ( $type eq 'daily_total' ) {
        return $self->_create_total_set( $start,
            $start->clone->add( days => 1 ) );
    }
    elsif ( $type eq 'weekly_total' ) {
        return $self->_create_total_set( $start,
            $start->clone->add( days => 7 ) );
    }
    elsif ( $type eq 'monthly_total' ) {
        return $self->_create_total_set( $start,
            $start->clone->add( months => 1 ) );
    }
    elsif ( $type eq 'all_time_total' ) {
        return $self->_create_total_all_time($start);
    }
    elsif ( $type eq 'daily_count' ) {
        return $self->_create_count_set( $start,
            $start->clone->add( days => 1 ) );
    }
    elsif ( $type eq 'weekly_count' ) {
        return $self->_create_count_set( $start,
            $start->clone->add( days => 7 ) );
    }
    elsif ( $type eq 'monthly_count' ) {
        return $self->_create_count_set( $start,
            $start->clone->add( months => 1 ) );
    }
    elsif ( $type eq 'all_time_count' ) {
        return $self->_create_count_all_time($start);
    }
    warn "Unrecognised type";
    return $self;
}

sub _get_customer_rs {
    my $self = shift;
    return $self->result_source->schema->resultset('Entity')->search(
        {
            type => 'customer',
        }
    );
}

sub _set_position_and_trend {
    my ( $self, @leaderboard ) = @_;

    # Sort numerically descending
    @leaderboard = sort { $b->{value} <=> $a->{value} } @leaderboard;

    my $position = 0;

    my $previous_board = $self->get_latest;

    if ( defined $previous_board ) {
        $previous_board = $previous_board->values;
    }

    for my $lb_val (@leaderboard) {
        $position++;
        $lb_val->{position} = $position;

        my $previous_value;

        if ( defined $previous_board ) {
            $previous_value =
              $previous_board->find( { entity_id => $lb_val->{entity_id} } );
        }

        my $trend;

        if ( !defined $previous_value ) {
            $trend = 0;
        }
        elsif ( $previous_value->position > $position ) {
            $trend = -1;
        }
        elsif ( $previous_value->position < $position ) {
            $trend = 1;
        }
        else {
            $trend = 0;
        }

        $lb_val->{trend} = $trend;
    }

    return @leaderboard;
}

sub _create_total_set {
    my ( $self, $start, $end ) = @_;

    my $user_rs = $self->_get_customer_rs;

    my @leaderboard;

    while ( my $user_result = $user_rs->next ) {
        my $transaction_rs =
          $user_result->purchases->search_between( $start, $end );

        my $transaction_sum = $transaction_rs->get_column('value')->sum;

        push @leaderboard,
          {
            entity_id => $user_result->id,
            value     => $transaction_sum || 0,
          };
    }

    @leaderboard = $self->_set_position_and_trend(@leaderboard);

    $self->create_related(
        'sets',
        {
            date   => $start,
            values => \@leaderboard,
        },
    );

    return $self;
}

sub _create_count_set {
    my ( $self, $start, $end ) = @_;

    my $user_rs = $self->_get_customer_rs;

    my @leaderboard;

    while ( my $user_result = $user_rs->next ) {
        my $transaction_rs =
          $user_result->purchases->search_between( $start, $end );

        my $transaction_count = $transaction_rs->count;

        push @leaderboard,
          {
            entity_id => $user_result->id,
            value     => $transaction_count || 0,
          };
    }

    @leaderboard = $self->_set_position_and_trend(@leaderboard);

    $self->create_related(
        'sets',
        {
            date   => $start,
            values => \@leaderboard,
        },
    );

    return $self;
}

sub _create_total_all_time {
    my ( $self, $end ) = @_;

    my $user_rs = $self->_get_customer_rs;

    my @leaderboard;

    while ( my $user_result = $user_rs->next ) {
        my $transaction_rs = $user_result->purchases->search_before($end);

        my $transaction_sum = $transaction_rs->get_column('value')->sum;

        push @leaderboard,
          {
            entity_id => $user_result->id,
            value     => $transaction_sum || 0,
          };
    }

    @leaderboard = $self->_set_position_and_trend(@leaderboard);

    $self->create_related(
        'sets',
        {
            date   => $end,
            values => \@leaderboard,
        },
    );

    return $self;
}

sub _create_count_all_time {
    my ( $self, $end ) = @_;

    my $user_rs = $self->_get_customer_rs;

    my @leaderboard;

    while ( my $user_result = $user_rs->next ) {
        my $transaction_rs = $user_result->purchases->search_before($end);

        my $transaction_count = $transaction_rs->count;

        push @leaderboard,
          {
            entity_id => $user_result->id,
            value     => $transaction_count || 0,
          };
    }

    @leaderboard = $self->_set_position_and_trend(@leaderboard);

    $self->create_related(
        'sets',
        {
            date   => $end,
            values => \@leaderboard,
        },
    );

    return $self;
}

sub get_latest {
    my $self = shift;

    my $latest = $self->search_related(
        'sets',
        {},
        {
            order_by => { -desc => 'date' },
        }
    )->first;

    return $latest;
}

1;