<?php

namespace Give\API\REST\V3\Routes\Donors;

use Exception;
use Give\API\REST\V3\Routes\Donors\ValueObjects\DonorRoute;
use Give\API\REST\V3\Support\CURIE;
use Give\Campaigns\Models\Campaign;
use Give\Donors\DonorStatisticsQuery;
use Give\Donors\Models\Donor;
use Give\Framework\Permissions\Facades\UserPermissions;
use WP_Error;
use WP_REST_Controller;
use WP_REST_Request;
use WP_REST_Response;
use WP_REST_Server;

/**
 * @since 4.4.0
 */
class DonorStatisticsController extends WP_REST_Controller
{
    /**
     * @since 4.4.0
     */
    public function __construct()
    {
        $this->namespace = DonorRoute::NAMESPACE;
        $this->rest_base = DonorRoute::BASE;
    }

    /**
     * @since 4.13.0 add schema
     * @since 4.4.0
     */
    public function register_routes()
    {
        register_rest_route($this->namespace, '/' . $this->rest_base . '/(?P<donorId>[\d]+)/statistics', [
            [
                'methods' => WP_REST_Server::READABLE,
                'callback' => [$this, 'get_item'],
                'permission_callback' => [$this, 'get_item_permissions_check'],
                'args' => [
                    'donorId' => [
                        'description' => __('The donor ID.', 'give'),
                        'type' => 'integer',
                        'required' => true,
                    ],
                    'mode' => [
                        'description' => __('The mode of donations to filter by "live" or "test".', 'give'),
                        'type' => 'string',
                        'default' => 'live',
                        'enum' => ['live', 'test'],
                    ],
                    'campaignId' => [
                        'description' => __('The ID of the campaign to filter donors by - zero or empty mean "all campaigns".', 'give'),
                        'type' => 'integer',
                        'default' => 0,
                    ],
                ],
            ],
            'schema' => [$this, 'get_item_schema'],
        ]);
    }

    /**
     * Get a single donor statistics.
     *
     * @since 4.4.0
     *
     * @param WP_REST_Request $request Full data about the request.
     *
     * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
     *
     * @throws Exception
     */
    public function get_item($request)
    {
        $donor = Donor::find($request->get_param('donorId'));
        if (!$donor) {
            return new WP_Error('donor_not_found', __('Donor not found', 'give'), ['status' => 404]);
        }

        $query = new DonorStatisticsQuery($donor, $request->get_param('mode'));

        if ($campaign = Campaign::find($request->get_param('campaignId'))) {
            $query = $query->filterByCampaign($campaign);
        }

        $item = [
            'donations' => [
                'lifetimeAmount' => $query->getLifetimeDonationsAmount(),
                'highestAmount' => $query->getHighestDonationAmount(),
                'averageAmount' => $query->getAverageDonationAmount(),
                'count' => $query->getDonationsCount(),
                'first' => $query->getFirstDonation(),
                'last' => $query->getLastDonation()
            ],
            'donorType' => $query->getDonorType(),
            'preferredPaymentMethod' => $query->preferredPaymentMethod(),
        ];

        $response = $this->prepare_item_for_response($item, $request);

        return rest_ensure_response($response);
    }

    /**
     * @since 4.14.0 replace logic with UserPermissions facade
     * @since 4.4.0
     *
     * @param WP_REST_Request $request
     *
     * @return bool
     */
    public function get_item_permissions_check($request): bool
    {
        return UserPermissions::donors()->canView();
    }

    /**
     * @since 4.14.0 Add donor link to the response
     * @since 4.4.0
     */
    public function prepare_item_for_response($item, $request): WP_REST_Response
    {
        $self_url = rest_url(sprintf(
            '%s/%s/%d/%s',
            $this->namespace,
            $this->rest_base,
            $request->get_param('donorId'),
            'statistics'
        ));

        $self_url = add_query_arg([
            'mode' => $request->get_param('mode'),
            'campaignId' => $request->get_param('campaignId'),
        ], $self_url);

        $donor_url = rest_url(sprintf(
            '%s/%s/%d',
            $this->namespace,
            $this->rest_base,
            $request->get_param('donorId')
        ));

        $donor_url = add_query_arg([
            'mode' => $request->get_param('mode'),
            'campaignId' => $request->get_param('campaignId'),
        ], $donor_url);

        $links = [
            'self' => ['href' => $self_url],
            CURIE::relationUrl('donor') => [
                'href' => $donor_url,
                'embeddable' => true,
            ],
        ];

        $response = new WP_REST_Response($item);
        $response->add_links($links);

        return $response;
    }

    /**
     * @since 4.14.0 Moved from getSchema to get_item_schema and added response schema
     * @since 4.13.0
     */
    public function get_item_schema(): array
    {
        return [
            '$schema' => 'http://json-schema.org/draft-04/schema#',
            'title' => 'givewp/donor-statistics',
            'description' => esc_html__('Provides statistics for a specific donor.', 'give'),
            'type' => 'object',
            'properties' => [
                'donations' => [
                    'type' => 'object',
                    'description' => esc_html__('Donation statistics', 'give'),
                    'properties' => [
                        'lifetimeAmount' => [
                            'type' => ['integer', 'number'],
                            'description' => esc_html__('Total lifetime donation amount', 'give'),
                        ],
                        'highestAmount' => [
                            'type' => ['integer', 'number'],
                            'description' => esc_html__('Highest single donation amount', 'give'),
                        ],
                        'averageAmount' => [
                            'type' => ['integer', 'number'],
                            'description' => esc_html__('Average donation amount', 'give'),
                        ],
                        'count' => [
                            'type' => 'integer',
                            'description' => esc_html__('Total number of donations', 'give'),
                        ],
                        'first' => [
                            'type' => ['object', 'null'],
                            'description' => esc_html__('First donation details', 'give'),
                        ],
                        'last' => [
                            'type' => ['object', 'null'],
                            'description' => esc_html__('Last donation details', 'give'),
                        ],
                    ],
                ],
                'donorType' => [
                    'type' => 'string',
                    'description' => esc_html__('Type of donor', 'give'),
                ],
                'preferredPaymentMethod' => [
                    'type' => ['string', 'null'],
                    'description' => esc_html__('Preferred payment method', 'give'),
                ],
            ],
        ];
    }
}