package Pear::LocalLoop::Controller::Api::External;
use Mojo::Base 'Mojolicious::Controller';
use Mojo::JSON;

sub post_lcc_transactions {
    my $c = shift;

    my $user = $c->stash->{api_user};

    # TODO Check the user is lancaster city council

    my $validation = $c->validation;
    $validation->input( $c->stash->{api_json} );
    $validation->optional('page')->number;
    $validation->optional('per_page')->number;
    $validation->optional('search');

    return $c->api_validation_error if $validation->has_error;

    my $search_ref = { 'me.buyer_id' => $user->entity->id };
    if ( $validation->param('search') ) {
        $search_ref->{"organisation.name"} =
          { '-like' => join( '', '%', $validation->param('search'), '%' ) };
    }

    my $lcc_transactions = $c->schema->resultset('Transaction')->search(
        $search_ref,
        {
            page     => $validation->param('page')     || 1,
            rows     => $validation->param('per_page') || 10,
            join     => [ 'transaction', 'organisation' ],
            order_by => { -desc => 'transaction.purchase_time' },
        }
    );

    # purchase_time needs timezone attached to it
    my @transaction_list = (
        map {
            {
                transaction_external_id => $_->external_id,
                seller                  => $_->transaction->seller->name,
                net_value               => $_->transaction->meta->net_value,
                gross_value             => $_->transaction->meta->gross_value,
                sales_tax_value => $_->transaction->meta->sales_tax_value,
                purchase_time   =>
                  $c->format_iso_datetime( $_->transaction->purchase_time ),
            }
        } $lcc_transactions->all
    );

    return $c->render(
        json => {
            success      => Mojo::JSON->true,
            transactions => \@transaction_list,
            page_no      => $lcc_transactions->pager->total_entries,
        }
    );
}

sub post_lcc_suppliers {
    my $c = shift;

    my $user = $c->stash->{api_user};

    # TODO give an error if user is not of Lancashire County Council

# my $is_lcc = $user->entity->organisation->count({ name => "Lancashire County Council" });

    my $v = $c->validation;
    $v->input( $c->stash->{api_json} );
    $v->optional('page')->number;
    $v->optional('sort_by');
    $v->optional('sort_dir');
    $v->optional('search');

    my $order_by = [ { -asc => 'organisation.name' }, ];
    if ( $v->param('sort_by') ) {
        my %dirs  = ( 'asc' => '-asc', 'desc' => '-desc' );
        my $dir   = $dirs{ $v->param('sort_dir') } // '-asc';
        my %sorts = (
            'name'     => 'organisation.name',
            'postcode' => 'organisation.postcode',
            'spend'    => 'total_spend',
        );
        my $sort = $sorts{ $v->param('sort_by') } || 'organisation.name';
        $order_by->[0] = { $dir => $sort };
    }

    return $c->api_validation_error if $v->has_error;

    my $lcc_suppliers = $c->schema->resultset('Entity')->search(
        {
            'sales.buyer_id' => $user->entity->id,
            (
                $v->param('search')
                ? (
                    '-or' => [
                        {
                            'organisation.name' =>
                              { 'like' => $v->param('search') . '%' }
                        },
                        {
                            'organisation.postcode' =>
                              { 'like' => $v->param('search') . '%' }
                        },
                    ]
                  )
                : ()
            ),
        },
        {
            join      => [ 'sales', 'organisation' ],
            group_by  => [ 'me.id', 'organisation.id' ],
            '+select' => [
                {
                    'sum' => 'sales.value',
                    '-as' => 'total_spend',
                }
            ],
            '+as'    => ['total_spend'],
            page     => $v->param('page') || 1,
            rows     => 10,
            order_by => $order_by,
        }
    );

    my @supplier_list = (
        map {
            {
                entity_id => $_->id,
                name      => $_->name,
                street    => $_->organisation->street_name,
                town      => $_->organisation->town,
                postcode  => $_->organisation->postcode,
                country   => $_->organisation->country,
                spend     => ( $_->get_column('total_spend') / 100000 ) // 0,
            }
        } $lcc_suppliers->all
    );

    return $c->render(
        json => {
            success   => Mojo::JSON->true,
            suppliers => \@supplier_list,
            page_no   => $lcc_suppliers->pager->total_entries,
        }
    );
}

sub post_year_spend {
    my $c = shift;

    my $user = $c->stash->{api_user};

    my $v = $c->validation;
    $v->input( $c->stash->{api_json} );
    $v->required('from');
    $v->required('to');

    return $c->api_validation_error if $v->has_error;

    my $last  = $c->parse_iso_date( $v->param('to') );
    my $first = $c->parse_iso_date( $v->param('from') );

    my $dtf    = $c->schema->storage->datetime_parser;
    my $driver = $c->schema->storage->dbh->{Driver}->{Name};
    my $spend_rs =
      $c->schema->resultset( 'ViewQuantisedTransaction' . $driver )->search(
        {
            purchase_time => {
                -between => [
                    $dtf->format_datetime($first),
                    $dtf->format_datetime($last),
                ],
            },
            buyer_id => $user->entity->id,
        },
        {
            columns => [
                {
                    quantised   => 'quantised_days',
                    count       => \"COUNT(*)",
                    total_spend => { sum => 'value' },
                }
            ],
            group_by => 'quantised_days',
            order_by => { '-asc' => 'quantised_days' },
        }
      );

    my @graph_data = (
        map {
            {
                count => $_->get_column('count'),
                value => ( $_->get_column('total_spend') / 100000 ) // 0,
                date  => $_->get_column('quantised'),
            }
        } $spend_rs->all,
    );

    return $c->render(
        json => {
            success => Mojo::JSON->true,
            data    => \@graph_data,
        }
    );
}

sub post_supplier_count {
    my $c = shift;

    my $user = $c->stash->{api_user};

    my $v = $c->validation;
    $v->input( $c->stash->{api_json} );
    $v->required('from');
    $v->required('to');

    return $c->api_validation_error if $v->has_error;

    my $last  = $c->parse_iso_date( $v->param('to') );
    my $first = $c->parse_iso_date( $v->param('from') );

    my $dtf    = $c->schema->storage->datetime_parser;
    my $driver = $c->schema->storage->dbh->{Driver}->{Name};
    my $spend_rs =
      $c->schema->resultset( 'ViewQuantisedTransaction' . $driver )->search(
        {
            purchase_time => {
                -between => [
                    $dtf->format_datetime($first),
                    $dtf->format_datetime($last),
                ],
            },
            buyer_id => $user->entity->id,
        },
        {
            join   => { 'seller' => 'organisation' },
            select => [
                { count => 'me.value', '-as' => 'count' },
                { sum   => 'me.value', '-as' => 'total_spend' },
                'organisation.name',
                'me.quantised_days',
            ],
            as       => [qw/count total_spend name quantised_days/],
            group_by => [qw/me.quantised_days seller.id organisation.id/],
            order_by => { '-asc' => 'me.quantised_days' },
        }
      );

    my @graph_data = (
        map {
            {
                count  => $_->get_column('count'),
                value  => ( $_->get_column('total_spend') / 100000 ) // 0,
                date   => $_->get_column('quantised_days'),
                seller => $_->get_column('name'),
            }
        } $spend_rs->all,
    );

    return $c->render(
        json => {
            success => Mojo::JSON->true,
            data    => \@graph_data,
        }
    );
}

sub post_supplier_history {
    my $c = shift;

    my $user = $c->stash->{api_user};

    # Temporary date lock for dev data
    my $last = DateTime->new(
        year  => 2019,
        month => 4,
        day   => 1
    );
    my $first  = $last->clone->subtract( years  => 1 );
    my $second = $last->clone->subtract( months => 6 );
    my $third  = $last->clone->subtract( months => 3 );

    my $dtf     = $c->schema->storage->datetime_parser;
    my $year_rs = $c->schema->resultset('Entity')->search(
        {
            'sales.purchase_time' => {
                -between => [
                    $dtf->format_datetime($first),
                    $dtf->format_datetime($last),
                ],
            },
            'sales.buyer_id' => $user->entity->id,
        },
        {
            join    => [ 'sales', 'organisation' ],
            columns => [
                {
                    id          => 'me.id',
                    name        => 'organisation.name',
                    count       => \"COUNT(*)",
                    total_spend => { sum => 'sales.value' },
                }
            ],
            group_by => [ 'me.id', 'organisation.id' ],
            order_by => { '-asc' => 'organisation.name' },
        }
    );
    my $half_year_rs = $c->schema->resultset('Entity')->search(
        {
            'sales.purchase_time' => {
                -between => [
                    $dtf->format_datetime($second),
                    $dtf->format_datetime($last),
                ],
            },
            'sales.buyer_id' => $user->entity->id,
        },
        {
            join    => [ 'sales', 'organisation' ],
            columns => [
                {
                    id          => 'me.id',
                    name        => 'organisation.name',
                    count       => \"COUNT(*)",
                    total_spend => { sum => 'sales.value' },
                }
            ],
            group_by => [ 'me.id', 'organisation.id' ],
            order_by => { '-asc' => 'organisation.name' },
        }
    );
    my $quarter_year_rs = $c->schema->resultset('Entity')->search(
        {
            'sales.purchase_time' => {
                -between => [
                    $dtf->format_datetime($third),
                    $dtf->format_datetime($last),
                ],
            },
            'sales.buyer_id' => $user->entity->id,
        },
        {
            join    => [ 'sales', 'organisation' ],
            columns => [
                {
                    id          => 'me.id',
                    name        => 'organisation.name',
                    count       => \"COUNT(*)",
                    total_spend => { sum => 'sales.value' },
                }
            ],
            group_by => [ 'me.id', 'organisation.id' ],
            order_by => { '-asc' => 'organisation.name' },
        }
    );

    my %data;
    for my $row ( $year_rs->all ) {
        $data{ $row->get_column('id') } = {
            id            => $row->get_column('id'),
            name          => $row->get_column('name'),
            quarter_count => 0,
            quarter_total => 0,
            half_count    => 0,
            half_total    => 0,
            year_count    => $row->get_column('count'),
            year_total    => $row->get_column('total_spend') / 100000,
        };
    }

    for my $row ( $half_year_rs->all ) {
        $data{ $row->get_column('id') } = {
            id            => $row->get_column('id'),
            name          => $row->get_column('name'),
            quarter_count => 0,
            quarter_total => 0,
            half_count    => $row->get_column('count'),
            half_total    => $row->get_column('total_spend') / 100000,
            year_count    => 0,
            year_total    => 0,
            %{ $data{ $row->get_column('id') } },
        };
    }

    for my $row ( $quarter_year_rs->all ) {
        $data{ $row->get_column('id') } = {
            id            => $row->get_column('id'),
            name          => $row->get_column('name'),
            quarter_count => $row->get_column('count'),
            quarter_total => $row->get_column('total_spend') / 100000,
            half_count    => 0,
            half_total    => 0,
            year_count    => 0,
            year_total    => 0,
            %{ $data{ $row->get_column('id') } },
        };
    }

    return $c->render(
        json => {
            success => Mojo::JSON->true,
            data    => [ values %data ],
        }
    );
}

sub post_lcc_table_summary {
    my $c = shift;

    my $user = $c->stash->{api_user};

    my $v = $c->validation;
    $v->input( $c->stash->{api_json} );
    $v->required('from');
    $v->required('to');

    return $c->api_validation_error if $v->has_error;

    my $last  = $c->parse_iso_date( $v->param('to') );
    my $first = $c->parse_iso_date( $v->param('from') );

    my $transaction_rs = $c->schema->resultset('Transaction');

    my $dtf                  = $c->schema->storage->datetime_parser;
    my $ward_transactions_rs = $transaction_rs->search(
        {
            purchase_time => {
                -between => [
                    $dtf->format_datetime($first),
                    $dtf->format_datetime($last),
                ],
            },
            buyer_id => $user->entity->id,
        },
        {
            join     => { seller => { postcode => { gb_postcode => 'ward' } } },
            group_by => 'ward.id',
            select   => [
                { count => 'me.id',    '-as' => 'count' },
                { sum   => 'me.value', '-as' => 'sum' },
                'ward.ward'
            ],
            as => [qw/count sum ward_name/],
        }
    );

    my $transaction_type_data = {};

    my %meta_names = (
        local_service            => "Local Services",
        regional_service         => "Regional Services",
        national_service         => "National Services",
        private_household_rebate => "Private Household Rebates etc",
        business_tax_and_rebate  => "Business Tax & Service Rebates",
        stat_loc_gov             => "Statutory Loc Gov",
        central_loc_gov          => "Central Gov HMRC",
    );

    for my $meta (
        qw/
        local_service
        regional_service
        national_service
        private_household_rebate
        business_tax_and_rebate
        stat_loc_gov
        central_loc_gov
        /
      )
    {
        my $transaction_type_rs = $transaction_rs->search(
            {
                'me.purchase_time' => {
                    -between => [
                        $dtf->format_datetime($first),
                        $dtf->format_datetime($last),
                    ],
                },
                'me.buyer_id'   => $user->entity->id,
                'meta.' . $meta => 1,
            },
            {
                join     => 'meta',
                group_by => 'meta.' . $meta,
                select   => [
                    { count => 'me.id',    '-as' => 'count' },
                    { sum   => 'me.value', '-as' => 'sum' },
                ],
                as => [qw/count sum/],
            }
        )->first;

        $transaction_type_data->{$meta} = {
            (
                $transaction_type_rs
                ? (
                    count => $transaction_type_rs->get_column('count'),
                    sum   => $transaction_type_rs->get_column('sum'),
                    type  => $meta_names{$meta},
                  )
                : (
                    count => 0,
                    sum   => 0,
                    type  => $meta_names{$meta},
                )
            ),
        };
    }

    my @ward_transaction_list = (
        map {
            {
                ward  => $_->get_column('ward_name') || "N/A",
                sum   => $_->get_column('sum') / 100000,
                count => $_->get_column('count'),
            }
        } $ward_transactions_rs->all
    );

    return $c->render(
        json => {
            success => Mojo::JSON->true,
            wards   => \@ward_transaction_list,
            types   => $transaction_type_data,
        }
    );
}

1;