<?php

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

    protected static function getFullyQualifiedTable(): string {
        $table = str_replace('Model', '', get_called_class());
        $tableIncludesADBSuffix = strpos($table, 'ADB') !== false;
        $table = str_replace('ADB', '', $table);
        return "`" . ($tableIncludesADBSuffix ? ADDRESSDB_DBNAME : FRONKDB_DBNAME) . "`.`" . $table . "`";
    }

    protected static function getDB() {
        if (strpos(self::getFullyQualifiedTable(), ADDRESSDB_DBNAME) !== false)
            $FronkDB = FronkDB::singleton(ADDRESSDB_DBHOST, ADDRESSDB_DBUSER, ADDRESSDB_DBPASS, ADDRESSDB_DBNAME);
        else $FronkDB = FronkDB::singleton();

        return $FronkDB->link;
    }

    public static function create($data) {
        $db = self::getDB();
        $table = self::getFullyQualifiedTable();
        self::checkAllFields($data, ['id']);

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

            if (is_array($value)) {
                $value = json_encode($value);
            } else if ($value === "" && (new ReflectionProperty(get_called_class(), $field))->getType()->getName() === "float") {
                $value = null;
            } else if ($value === "" && (new ReflectionProperty(get_called_class(), $field))->getType()->getName() === "int") {
                $value = null;
            }

            $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;
    }

    /**
     * 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])) {
                http_response_code(500);
                die(json_encode([
                    "status" => "error",
                    "error" => "Required field $field is missing in data array",
                    "data" => $data
                ]));
            }
        }
    }


    public static function get($id): TTCrudBaseModel {
        $db = self::getDB();
        $id = $db->real_escape_string($id);
        $table = self::getFullyQualifiedTable();
        $sql = "SELECT * FROM $table WHERE `id` = $id";

        $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 {
        $db = self::getDB();
        $table = self::getFullyQualifiedTable();
        $filter = self::getSQLFilter($filter);
        $sql = "SELECT COUNT(*) as count FROM $table $filter";
        $result = $db->query($sql);

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

    public static function getSQLFilter(array $filter): string {
        if (empty($filter)) return '';
        $sql = 'WHERE 1=1';
        $calledClass = get_called_class();

        foreach ($filter as $key => $value) {
            foreach (explode('|', $key) as $column) {
                if (!property_exists($calledClass, $column)) {
                    throw new InvalidArgumentException("Field $column does not exist in $calledClass");
                }
            }
            $sql .= Helper::generateFilterCondition($value, $key, gettype($value) === "integer");
        }

        return $sql;
    }

    public static function getAll($filter = [], $limit = null, $offset = 0, $order = ["key" => null]): array {
        $db = self::getDB();
        $table = self::getFullyQualifiedTable();
        $filter = self::getSQLFilter($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) {
        $db = self::getDB();
        $table = self::getFullyQualifiedTable();

        // 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;
            }

            if (is_array($value)) {
                $value = json_encode($value);
            }

            $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) {
        $db = self::getDB();
        $table = self::getFullyQualifiedTable();
        $id = $db->real_escape_string($id);
        $sql = "DELETE FROM $table WHERE `id` = $id";
        $db->query($sql);
        return $db->affected_rows;
    }

    public static function getFirst($filter = [], $order = ["key" => null]): ?TTCrudBaseModel {
        $db = self::getDB();
        $table = self::getFullyQualifiedTable();
        $filter = self::getSQLFilter($filter);
        $sql = "SELECT * FROM $table $filter";

        if ($order['key'] !== null) {
            $sql .= " ORDER BY `" . $order['key'] . "` " . $order['order'];
        } else {
            $sql .= " ORDER BY `id` ASC";
        }

        $sql .= " LIMIT 1";
        $result = $db->query($sql);

        if ($result->num_rows === 0) {
            return null;
        }

        return new static($result->fetch_assoc());
    }

}