<?php

class TTCrudBaseModel {
    public function __construct($data = []) {
        foreach ($data as $field => $value) {
            if (property_exists(get_called_class(), $field)) {
                $this->$field = $value;
            }
        }
    }

    public static function create($data) {
        $FronkDB = FronkDB::singleton();
        $db = $FronkDB->link;
        $table = self::getTable();
        self::checkAllFields($data, ['id']);

        $sqlColumns = [];
        $sqlValues = [];
        foreach ($data as $field => $value) {
            if (!property_exists(get_called_class(), $field)) {
                throw new Exception("Field $field does not exist in " . get_called_class());
            }

            $sqlValues[] = $value === null ? 'NULL' : "'" . $db->real_escape_string($value) . "'";
            $sqlColumns[] = "`$field`";
        }

        $sql = "INSERT INTO `$table` (" . implode(", ", $sqlColumns) . ") VALUES (" . implode(", ", $sqlValues) . ")";
        $db->query($sql) or die($db->error);

        return $db->insert_id;
    }

    public static function getTable(): string {
        return str_replace('Model', '', get_called_class());
    }

    /**
     * Checks if all required fields of the current class are present in a given data array.
     *
     * This method uses reflection to determine which fields are required based on their type declarations.
     * It then iterates over these required fields and throws an exception if any of them are missing
     * from the provided data array.
     *
     * @param array $data The data array to check.
     * @param array $skip An optional array of field names to skip during the check.
     *
     * @return void
     * @throws Exception If any required field is missing in the `$data` array.
     *
     */
    public static function checkAllFields(array $data, array $skip = []) {
        $requiredVars = array_filter(get_class_vars(get_called_class()), function ($value, $key) {
            $reflectionProperty = new ReflectionProperty(get_called_class(), $key);
            return !$reflectionProperty->hasType() || !$reflectionProperty->getType()->allowsNull();
        }, ARRAY_FILTER_USE_BOTH);

        foreach ($requiredVars as $field => $value) {
            if (in_array($field, $skip)) {
                continue;
            }

            if (!isset($data[$field])) {
                throw new Exception("Required field $field is missing in data array");
            }
        }
    }


    public static function get($id, $die= false): TTCrudBaseModel {
        $FronkDB = FronkDB::singleton();
        $db = $FronkDB->link;
        $id = $db->real_escape_string($id);
        $table = self::getTable();
        $sql = "SELECT * FROM `$table` WHERE `id` = $id";

        if($die) {
            die($sql);
        }

        $result = $db->query($sql);
        // as TTCRudBaseModel is abstract, we need to get the class name of the child class
        $class = get_called_class();
        return new $class($result->fetch_assoc());
    }

    public static function count($filter = []): int {
        $FronkDB = FronkDB::singleton();
        $db = $FronkDB->link;
        $table = self::getTable();
        $filter = self::getSQLFilter($filter);
        $sql = "SELECT COUNT(*) as count FROM `$table` $filter";
        $result = $db->query($sql);

        return $result->fetch_assoc()['count'];
    }

    public static function getSQLFilter($filter): string {
        if (empty($filter)) {
            return "";
        }

        $sql = "WHERE 1=1";
        foreach ($filter as $key => $value) {
            if (!property_exists(get_called_class(), $key)) {
                throw new Exception("Field $key does not exist in " . get_called_class());
            }
            $sql .= Helper::generateFilterCondition($value, $key, gettype($value) === "integer");
        }

        return $sql;
    }

    public static function getAll($filter = [], $limit = null, $offset = 0, $order = ["key" => null]): array {
        $FronkDB = FronkDB::singleton();
        $db = $FronkDB->link;
        $table = self::getTable();
        $filter = self::getSQLFilter($filter);
        $sql = "SELECT * FROM `$table` $filter";

        $sql .= $order['key'] === null ? " ORDER BY `id` ASC" : " ORDER BY `" . $order['key'] . "` " . $order['order'];
        $sql .= $limit === null ? "" : " LIMIT " . $limit . " OFFSET " . $offset;
        try {
            $result = $db->query($sql);
        } catch (Exception $e) {
            echo $sql;
            die($e->getMessage());
        }

        $rows = [];
        $class = get_called_class();
        while ($row = $result->fetch_assoc()) {
            $rows[] = new $class($row);
        }

        return $rows;
    }

    public static function update($data) {
        $FronkDB = FronkDB::singleton();
        $db = $FronkDB->link;
        $table = self::getTable();

        // Check if all fields are set
        self::checkAllFields($data);

        $values = [];
        foreach ($data as $field => $value) {
            if (!property_exists(get_called_class(), $field)) {
                throw new Exception("Field $field does not exist in " . get_called_class());
            }
            if ($field === "id") {
                continue;
            }
            // TODO: make this cleaner
            if ($value === "" && (new ReflectionProperty(get_called_class(), $field))->getType()->getName() === "float") {
                $value = null;
            }
            if ($value === "" && (new ReflectionProperty(get_called_class(), $field))->getType()->getName() === "int") {
                $value = null;
            }

            $values[] = $value === null ? "`$field` = NULL" : "`$field` = '" . $db->real_escape_string($value) . "'";
        }

        $sql = "UPDATE `$table` SET " . implode(", ", $values) . " WHERE `id` = " . $db->real_escape_string($data['id']);
        $db->query($sql);
        return $db->affected_rows;
    }

    public static function delete($id) {
        $FronkDB = FronkDB::singleton();
        $db = $FronkDB->link;
        $table = self::getTable();
        $id = $db->real_escape_string($id);
        $sql = "DELETE FROM `$table` WHERE `id` = $id";
        $db->query($sql);
        return $db->affected_rows;
    }

}