<?php defined('BASEPATH') or exit('No direct script access allowed');

/* ----------------------------------------------------------------------------
 * Easy!Appointments - Online Appointment Scheduler
 *
 * @package     EasyAppointments
 * @author      A.Tselegidis <alextselegidis@gmail.com>
 * @copyright   Copyright (c) Alex Tselegidis
 * @license     https://opensource.org/licenses/GPL-3.0 - GPLv3
 * @link        http://easyunavailabilities.org
 * @since       v1.0.0
 * ---------------------------------------------------------------------------- */

/**
 * Unavailabilities model.
 *
 * @package Models
 */
class Unavailabilities_model extends EA_Model
{
    /**
     * @var array
     */
    protected array $casts = [
        'id' => 'integer',
        'is_unavailability' => 'boolean',
        'id_users_provider' => 'integer',
        'id_users_customer' => 'integer',
        'id_services' => 'integer',
    ];

    /**
     * @var array
     */
    protected array $api_resource = [
        'id' => 'id',
        'book' => 'book_datetime',
        'start' => 'start_datetime',
        'end' => 'end_datetime',
        'location' => 'location',
        'color' => 'color',
        'status' => 'status',
        'notes' => 'notes',
        'hash' => 'hash',
        'providerId' => 'id_users_provider',
        'googleCalendarId' => 'id_google_calendar',
    ];

    /**
     * Save (insert or update) an unavailability.
     *
     * @param array $unavailability Associative array with the unavailability data.
     *
     * @return int Returns the unavailability ID.
     *
     * @throws InvalidArgumentException
     */
    public function save(array $unavailability): int
    {
        $this->validate($unavailability);

        if (empty($unavailability['id'])) {
            return $this->insert($unavailability);
        } else {
            return $this->update($unavailability);
        }
    }

    /**
     * Validate the unavailability data.
     *
     * @param array $unavailability Associative array with the unavailability data.
     *
     * @throws InvalidArgumentException
     */
    public function validate(array $unavailability): void
    {
        // If an unavailability ID is provided then check whether the record really exists in the database.
        if (!empty($unavailability['id'])) {
            $count = $this->db->get_where('appointments', ['id' => $unavailability['id']])->num_rows();

            if (!$count) {
                throw new InvalidArgumentException(
                    'The provided unavailability ID does not exist in the database: ' . $unavailability['id'],
                );
            }
        }

        // Make sure all required fields are provided.
        if (
            empty($unavailability['start_datetime']) ||
            empty($unavailability['end_datetime']) ||
            empty($unavailability['id_users_provider'])
        ) {
            throw new InvalidArgumentException(
                'Not all required fields are provided: ' . print_r($unavailability, true),
            );
        }

        // Make sure that the provided unavailability date time values are valid.
        if (!validate_datetime($unavailability['start_datetime'])) {
            throw new InvalidArgumentException('The unavailability start date time is invalid.');
        }

        if (!validate_datetime($unavailability['end_datetime'])) {
            throw new InvalidArgumentException('The unavailability end date time is invalid.');
        }

        // Make the unavailability lasts longer than the minimum duration (in minutes).
        $diff = (strtotime($unavailability['end_datetime']) - strtotime($unavailability['start_datetime'])) / 60;

        if ($diff < EVENT_MINIMUM_DURATION) {
            throw new InvalidArgumentException(
                'The unavailability duration cannot be less than ' . EVENT_MINIMUM_DURATION . ' minutes.',
            );
        }

        // Make sure the provider ID really exists in the database.
        $count = $this->db
            ->select()
            ->from('users')
            ->join('roles', 'roles.id = users.id_roles', 'inner')
            ->where('users.id', $unavailability['id_users_provider'])
            ->where('roles.slug', DB_SLUG_PROVIDER)
            ->get()
            ->num_rows();

        if (!$count) {
            throw new InvalidArgumentException(
                'The unavailability provider ID was not found in the database: ' . $unavailability['id_users_provider'],
            );
        }
    }

    /**
     * Get all unavailabilities that match the provided criteria.
     *
     * @param array|string|null $where Where conditions.
     * @param int|null $limit Record limit.
     * @param int|null $offset Record offset.
     * @param string|null $order_by Order by.
     *
     * @return array Returns an array of unavailabilities.
     */
    public function get(
        array|string|null $where = null,
        ?int $limit = null,
        ?int $offset = null,
        ?string $order_by = null,
    ): array {
        if ($where !== null) {
            $this->db->where($where);
        }

        if ($order_by) {
            $this->db->order_by($this->quote_order_by($order_by));
        }

        $unavailabilities = $this->db
            ->get_where('appointments', ['is_unavailability' => true], $limit, $offset)
            ->result_array();

        foreach ($unavailabilities as &$unavailability) {
            $this->cast($unavailability);
        }

        return $unavailabilities;
    }

    /**
     * Insert a new unavailability into the database.
     *
     * @param array $unavailability Associative array with the unavailability data.
     *
     * @return int Returns the unavailability ID.
     *
     * @throws RuntimeException
     */
    protected function insert(array $unavailability): int
    {
        $unavailability['book_datetime'] = date('Y-m-d H:i:s');
        $unavailability['create_datetime'] = date('Y-m-d H:i:s');
        $unavailability['update_datetime'] = date('Y-m-d H:i:s');
        $unavailability['hash'] = random_string('alnum', 12);
        $unavailability['is_unavailability'] = true;

        if (!$this->db->insert('appointments', $unavailability)) {
            throw new RuntimeException('Could not insert unavailability.');
        }

        return $this->db->insert_id();
    }

    /**
     * Update an existing unavailability.
     *
     * @param array $unavailability Associative array with the unavailability data.
     *
     * @return int Returns the unavailability ID.
     *
     * @throws RuntimeException
     */
    protected function update(array $unavailability): int
    {
        $unavailability['update_datetime'] = date('Y-m-d H:i:s');

        if (!$this->db->update('appointments', $unavailability, ['id' => $unavailability['id']])) {
            throw new RuntimeException('Could not update unavailability record.');
        }

        return $unavailability['id'];
    }

    /**
     * Remove an existing unavailability from the database.
     *
     * @param int $unavailability_id Unavailability ID.
     *
     * @throws RuntimeException
     */
    public function delete(int $unavailability_id): void
    {
        $this->db->delete('appointments', ['id' => $unavailability_id]);
    }

    /**
     * Get a specific unavailability from the database.
     *
     * @param int $unavailability_id The ID of the record to be returned.
     *
     * @return array Returns an array with the unavailability data.
     *
     * @throws InvalidArgumentException
     */
    public function find(int $unavailability_id): array
    {
        $unavailability = $this->db->get_where('appointments', ['id' => $unavailability_id])->row_array();

        if (!$unavailability) {
            throw new InvalidArgumentException(
                'The provided unavailability ID was not found in the database: ' . $unavailability_id,
            );
        }

        $this->cast($unavailability);

        return $unavailability;
    }

    /**
     * Get a specific field value from the database.
     *
     * @param int $unavailability_id Unavailability ID.
     * @param string $field Name of the value to be returned.
     *
     * @return mixed Returns the selected unavailability value from the database.
     *
     * @throws InvalidArgumentException
     */
    public function value(int $unavailability_id, string $field): mixed
    {
        if (empty($field)) {
            throw new InvalidArgumentException('The field argument is cannot be empty.');
        }

        if (empty($unavailability_id)) {
            throw new InvalidArgumentException('The unavailability ID argument cannot be empty.');
        }

        // Check whether the unavailability exists.
        $query = $this->db->get_where('appointments', ['id' => $unavailability_id]);

        if (!$query->num_rows()) {
            throw new InvalidArgumentException(
                'The provided unavailability ID was not found in the database: ' . $unavailability_id,
            );
        }

        // Check if the required field is part of the unavailability data.
        $unavailability = $query->row_array();

        $this->cast($unavailability);

        if (!array_key_exists($field, $unavailability)) {
            throw new InvalidArgumentException(
                'The requested field was not found in the unavailability data: ' . $field,
            );
        }

        return $unavailability[$field];
    }

    /**
     * Get the query builder interface, configured for use with the unavailabilities table.
     *
     * @return CI_DB_query_builder
     */
    public function query(): CI_DB_query_builder
    {
        return $this->db->from('appointments');
    }

    /**
     * Search unavailabilities by the provided keyword.
     *
     * @param string $keyword Search keyword.
     * @param int|null $limit Record limit.
     * @param int|null $offset Record offset.
     * @param string|null $order_by Order by.
     *
     * @return array Returns an array of unavailabilities.
     */
    public function search(string $keyword, ?int $limit = null, ?int $offset = null, ?string $order_by = null): array
    {
        $unavailabilities = $this->db
            ->select()
            ->from('appointments')
            ->join('users AS providers', 'providers.id = appointments.id_users_provider', 'inner')
            ->where('is_unavailability', true)
            ->group_start()
            ->like('appointments.start_datetime', $keyword)
            ->or_like('appointments.end_datetime', $keyword)
            ->or_like('appointments.location', $keyword)
            ->or_like('appointments.hash', $keyword)
            ->or_like('appointments.notes', $keyword)
            ->or_like('providers.first_name', $keyword)
            ->or_like('providers.last_name', $keyword)
            ->or_like('providers.email', $keyword)
            ->or_like('providers.phone_number', $keyword)
            ->group_end()
            ->limit($limit)
            ->offset($offset)
            ->order_by($this->quote_order_by($order_by))
            ->get()
            ->result_array();

        foreach ($unavailabilities as &$unavailability) {
            $this->cast($unavailability);
        }

        return $unavailabilities;
    }

    /**
     * Get unavailabilities as options for dropdowns.
     *
     * @param array|string|null $where Where conditions.
     *
     * @return array Returns an array of options with 'value' and 'label' keys.
     */
    public function to_options(array|string|null $where = null): array
    {
        if ($where !== null) {
            $this->db->where($where);
        }

        $unavailabilities = $this->db
            ->select('appointments.id, appointments.start_datetime, appointments.notes')
            ->from('appointments')
            ->where('is_unavailability', true)
            ->order_by('start_datetime', 'DESC')
            ->get()
            ->result_array();

        $options = [];

        foreach ($unavailabilities as $unavailability) {
            $label = $unavailability['start_datetime'];
            if (!empty($unavailability['notes'])) {
                $label .= ' - ' . substr($unavailability['notes'], 0, 30);
            }
            $options[] = [
                'value' => (int) $unavailability['id'],
                'label' => $label,
            ];
        }

        return $options;
    }

    /**
     * Load related resources to an unavailability.
     *
     * @param array $unavailability Associative array with the unavailability data.
     * @param array $resources Resource names to be attached ("service", "provider", "customer" supported).
     *
     * @throws InvalidArgumentException
     */
    public function load(array &$unavailability, array $resources): void
    {
        if (empty($unavailability) || empty($resources)) {
            return;
        }

        foreach ($resources as $resource) {
            $unavailability['provider'] = match ($resource) {
                'provider' => $this->db
                    ->get_where('users', [
                        'id' => $unavailability['id_users_provider'] ?? ($unavailability['providerId'] ?? null),
                    ])
                    ->row_array(),
                default => throw new InvalidArgumentException(
                    'The requested unavailability relation is not supported: ' . $resource,
                ),
            };
        }
    }

    /**
     * Convert the database unavailability record to the equivalent API resource.
     *
     * @param array $unavailability Unavailability data.
     */
    public function api_encode(array &$unavailability): void
    {
        $encoded_resource = [
            'id' => array_key_exists('id', $unavailability) ? (int) $unavailability['id'] : null,
            'book' => $unavailability['book_datetime'],
            'start' => $unavailability['start_datetime'],
            'end' => $unavailability['end_datetime'],
            'hash' => $unavailability['hash'],
            'location' => $unavailability['location'],
            'notes' => $unavailability['notes'],
            'providerId' =>
                $unavailability['id_users_provider'] !== null ? (int) $unavailability['id_users_provider'] : null,
            'googleCalendarId' =>
                $unavailability['id_google_calendar'] !== null ? (int) $unavailability['id_google_calendar'] : null,
            'caldavCalendarId' =>
                $unavailability['id_caldav_calendar'] !== null ? $unavailability['id_caldav_calendar'] : null,
        ];

        $unavailability = $encoded_resource;
    }

    /**
     * Convert the API resource to the equivalent database unavailability record.
     *
     * @param array $unavailability API resource.
     * @param array|null $base Base unavailability data to be overwritten with the provided values (useful for updates).
     */
    public function api_decode(array &$unavailability, ?array $base = null): void
    {
        $decoded_resource = $base ?: [];

        if (array_key_exists('id', $unavailability)) {
            $decoded_resource['id'] = $unavailability['id'];
        }

        if (array_key_exists('book', $unavailability)) {
            $decoded_resource['book_datetime'] = $unavailability['book'];
        }

        if (array_key_exists('start', $unavailability)) {
            $decoded_resource['start_datetime'] = $unavailability['start'];
        }

        if (array_key_exists('end', $unavailability)) {
            $decoded_resource['end_datetime'] = $unavailability['end'];
        }

        if (array_key_exists('hash', $unavailability)) {
            $decoded_resource['hash'] = $unavailability['hash'];
        }

        if (array_key_exists('location', $unavailability)) {
            $decoded_resource['location'] = $unavailability['location'];
        }

        if (array_key_exists('notes', $unavailability)) {
            $decoded_resource['notes'] = $unavailability['notes'];
        }

        if (array_key_exists('providerId', $unavailability)) {
            $decoded_resource['id_users_provider'] = $unavailability['providerId'];
        }

        if (array_key_exists('googleCalendarId', $unavailability)) {
            $decoded_resource['id_google_calendar'] = $unavailability['googleCalendarId'];
        }

        if (array_key_exists('caldavCalendarId', $unavailability)) {
            $decoded_resource['id_caldav_calendar'] = $unavailability['caldavCalendarId'];
        }

        $decoded_resource['is_unavailability'] = true;

        $unavailability = $decoded_resource;
    }
}
