<?php

namespace App\Models;

use CodeIgniter\Database\ResultInterface;
use CodeIgniter\Model;
use stdClass;

/**
 * Giftcard class
 */
class Giftcard extends Model
{
    protected $table = 'giftcards';
    protected $primaryKey = 'giftcard_id';
    protected $useAutoIncrement = true;
    protected $useSoftDeletes = false;
    protected $allowedFields = [
        'giftcard_number',
        'value',
        'deleted',
        'person_id',
        'record_time'
    ];

    /**
     * Determines if a given giftcard_id is a giftcard
     */
    public function exists(int $giftcard_id): bool
    {
        $builder = $this->db->table('giftcards');
        $builder->where('giftcard_id', $giftcard_id);
        $builder->where('deleted', 0);

        return ($builder->get()->getNumRows() == 1);    // TODO: ===
    }

    /**
     * Gets max gift card number    // TODO: This isn't entirely accurate.  It returns the object and the results then pulls the giftcard_number
     */
    public function get_max_number(): ?object
    {
        $builder = $this->db->table('giftcards');
        $builder->select('CAST(giftcard_number AS UNSIGNED) AS giftcard_number');
        $builder->where('giftcard_number REGEXP \'^[0-9]+$\'');
        $builder->orderBy("giftcard_number", "desc");
        $builder->limit(1);

        return $builder->get()->getRow();
    }

    /**
     * Gets total of rows
     */
    public function get_total_rows(): int
    {
        $builder = $this->db->table('giftcards');
        $builder->where('deleted', 0);

        return $builder->countAllResults();
    }

    /**
     * Gets information about a particular giftcard
     */
    public function get_info(int $giftcard_id): object
    {
        $builder = $this->db->table('giftcards');
        $builder->join('people', 'people.person_id = giftcards.person_id', 'left');
        $builder->where('giftcard_id', $giftcard_id);
        $builder->where('deleted', 0);

        $query = $builder->get();

        if ($query->getNumRows() == 1) {    // TODO: ===
            return $query->getRow();
        } else {    // TODO: No need for this else statement.  Just put it's contents outside of the else since the if has a return in it.
            return $this->getEmptyObject('giftcards');
        }
    }

    /**
     * Initializes an empty object based on database definitions
     * @param string $table_name
     * @return object
     */
    private function getEmptyObject(string $table_name): object
    {
        // Return an empty base parent object, as $item_id is NOT an item
        $empty_obj = new stdClass();

        // Iterate through field definitions to determine how the fields should be initialized
        foreach ($this->db->getFieldData($table_name) as $field) {
            $field_name = $field->name;

            if (in_array($field->type, ['int', 'tinyint', 'decimal'])) {
                $empty_obj->$field_name = ($field->primary_key == 1) ? NEW_ENTRY : 0;
            } else {
                $empty_obj->$field_name = null;
            }
        }

        return $empty_obj;
    }

    /**
     * Gets a giftcard id given a giftcard number
     */
    public function get_giftcard_id(string $giftcard_number): bool
    {
        $builder = $this->db->table('giftcards');
        $builder->where('giftcard_number', $giftcard_number);
        $builder->where('deleted', 0);

        $query = $builder->get();

        if ($query->getNumRows() == 1) {    // TODO: ===
            return $query->getRow()->giftcard_id;
        }

        return false;
    }

    /**
     * Gets information about multiple giftcards
     */
    public function get_multiple_info(array $giftcard_ids): ResultInterface
    {
        $builder = $this->db->table('giftcards');
        $builder->whereIn('giftcard_id', $giftcard_ids);
        $builder->where('deleted', 0);
        $builder->orderBy('giftcard_number', 'asc');

        return $builder->get();
    }

    /**
     * Inserts or updates a giftcard
     */
    public function save_value(array &$giftcard_data, int $giftcard_id = NEW_ENTRY): bool
    {
        $builder = $this->db->table('giftcards');

        if ($giftcard_id == NEW_ENTRY || !$this->exists($giftcard_id)) {
            if ($builder->insert($giftcard_data)) {
                $giftcard_data['giftcard_number'] = $this->db->insertID();
                $giftcard_data['giftcard_id'] = $this->db->insertID();

                return true;
            }

            return false;
        }

        $builder->where('giftcard_id', $giftcard_id);

        return $builder->update($giftcard_data);
    }

    /**
     * Updates multiple giftcards at once
     */
    public function update_multiple(array $giftcard_data, array $giftcard_ids): bool    // TODO: This function appears to never be used in the code.
    {
        $builder = $this->db->table('giftcards');
        $builder->whereIn('giftcard_id', $giftcard_ids);

        return $builder->update($giftcard_data);
    }

    /**
     * Deletes one giftcard
     */
    public function delete($giftcard_id = null, bool $purge = false): bool
    {
        $builder = $this->db->table('giftcards');
        $builder->where('giftcard_id', $giftcard_id);

        return $builder->update(['deleted' => 1]);
    }

    /**
     * Deletes a list of giftcards
     */
    public function delete_list(array $giftcard_ids): bool
    {
        $builder = $this->db->table('giftcards');
        $builder->whereIn('giftcard_id', $giftcard_ids);

        return $builder->update(['deleted' => 1]);
    }

    /**
     * Get search suggestions to find giftcards
     */
    public function get_search_suggestions(string $search, int $limit = 25): array
    {
        $suggestions = [];

        $builder = $this->db->table('giftcards');
        $builder->like('giftcard_number', $search);
        $builder->where('deleted', 0);
        $builder->orderBy('giftcard_number', 'asc');

        foreach ($builder->get()->getResult() as $row) {
            $suggestions[] = ['label' => $row->giftcard_number];
        }

        $builder = $this->db->table('customers');
        $builder->join('people', 'customers.person_id = people.person_id', 'left');
        $builder->groupStart();
        $builder->like('first_name', $search);
        $builder->orLike('last_name', $search);
        $builder->orLike('CONCAT(first_name, " ", last_name)', $search);
        $builder->groupEnd();
        $builder->where('deleted', 0);
        $builder->orderBy('last_name', 'asc');

        foreach ($builder->get()->getResult() as $row) {
            $suggestions[] = ['label' => $row->first_name . ' ' . $row->last_name];
        }

        // Only return $limit suggestions
        if (count($suggestions) > $limit) {
            $suggestions = array_slice($suggestions, 0, $limit);
        }

        return $suggestions;
    }

    /**
     * Gets gift cards
     */
    public function get_found_rows(string $search): int
    {
        return $this->search($search, 0, 0, 'giftcard_number', 'asc', true);
    }

    /**
     * Performs a search on giftcards
     */
    public function search(string $search, ?int $rows = 0, ?int $limit_from = 0, ?string $sort = 'giftcard_number', ?string $order = 'asc', ?bool $count_only = false)
    {
        // Set default values
        if ($rows == null) $rows = 0;
        if ($limit_from == null) $limit_from = 0;
        if ($sort == null) $sort = 'giftcard_number';
        if ($order == null) $order = 'asc';
        if ($count_only == null) $count_only = false;

        // Set default values
        if ($rows == null) $rows = 0;
        if ($limit_from == null) $limit_from = 0;
        if ($sort == null) $sort = 'giftcard_number';
        if ($order == null) $order = 'asc';
        if ($count_only == null) $count_only = false;

        $builder = $this->db->table('giftcards');

        // get_found_rows case
        if ($count_only) {    // TODO: replace this with `if ($count_only)`
            $builder->select('COUNT(giftcard_id) as count');
        }

        $builder->join('people AS person', 'giftcards.person_id = person.person_id', 'left');
        $builder->groupStart();
        $builder->like('person.first_name', $search);
        $builder->orLike('person.last_name', $search);
        $builder->orLike('CONCAT(person.first_name, " ", person.last_name)', $search);
        $builder->orLike('giftcards.giftcard_number', $search);
        $builder->orLike('giftcards.person_id', $search);
        $builder->groupEnd();
        $builder->where('giftcards.deleted', 0);

        // get_found_rows case
        if ($count_only) {
            return $builder->get()->getRow()->count;
        }

        $builder->orderBy($sort, $order);

        if ($rows > 0) {
            $builder->limit($rows, $limit_from);
        }

        return $builder->get();
    }

    /**
     * Gets gift card value
     */
    public function get_giftcard_value(string $giftcard_number): float    // TODO: we may need to do a search for all float values and for currencies cast them to strings at the point where we get them from the database.
    {
        if (!$this->exists($this->get_giftcard_id($giftcard_number))) {
            return 0;
        }

        $builder = $this->db->table('giftcards');
        $builder->where('giftcard_number', $giftcard_number);

        return $builder->get()->getRow()->value;
    }

    /**
     * Updates gift card value
     */
    public function update_giftcard_value(string $giftcard_number, float $value): void    // TODO: Should we return the value of update like other similar functions do?
    {
        $builder = $this->db->table('giftcards');
        $builder->where('giftcard_number', $giftcard_number);
        $builder->update(['value' => $value]);
    }

    /**
     * Determines if a given giftcard_name exists
     */
    public function exists_giftcard_name($giftcard_name): bool
    {
        $giftcard_name = strtoupper($giftcard_name);

        $builder = $this->db->table('giftcards');
        $builder->where('giftcard_number', $giftcard_name);
        $builder->where('deleted', 0);

        return ($builder->get()->getNumRows() == 1);    // TODO: ===
    }

    /**
     * Generate unique gift card name/number
     */
    public function generate_unique_giftcard_name(string $value): string
    {
        $value = str_replace('.', 'DE', $value);
        $random = bin2hex(openssl_random_pseudo_bytes(3));
        $giftcard_name = "$random-$value";

        if ($this->exists_giftcard_name($giftcard_name)) {
            $this->generate_unique_giftcard_name($value);
        }

        return strtoupper($giftcard_name);
    }

    /**
     * Gets gift card customer_id by gift card number
     *
     * @param string $giftcard_number Gift card number
     * @return int The customer_id of the gift card if it exists, 0 otherwise.
     */
    public function get_giftcard_customer(string $giftcard_number): int
    {
        if (!$this->exists($this->get_giftcard_id($giftcard_number))) {
            return 0;
        }

        $builder = $this->db->table('giftcards');
        $builder->where('giftcard_number', $giftcard_number);

        return $builder->get()->getRow()->person_id;
    }
}