initial

1 files changed, 240 insertions, 0 deletions

diff --git a/engine/Model.php b/engine/Model.php
new file mode 100644
index 0000000..e80b09d
--- /dev/null
+++ b/engine/Model.php
@@ -0,0 +1,240 @@
+<?php
+
+enum Type {
+    case STRING;
+    case INTEGER;
+    case FLOAT;
+    case ARRAY;
+    case BOOLEAN;
+    case JSON;
+    case SERIALIZED;
+}
+
+abstract class Model {
+
+    const DB_TABLE = null;
+    const DB_KEY = 'id';
+
+    protected static array $SpecCache = [];
+
+    public static function create_instance(...$args) {
+        $cl = get_called_class();
+        return new $cl(...$args);
+    }
+
+    public function __construct(array $raw) {
+        if (!isset(self::$SpecCache[static::class])) {
+            list($fields, $model_name_map, $db_name_map) = static::get_spec();
+            self::$SpecCache[static::class] = [
+                'fields' => $fields,
+                'model_name_map' => $model_name_map,
+                'db_name_map' => $db_name_map
+            ];
+        }
+
+        foreach (self::$SpecCache[static::class]['fields'] as $field)
+            $this->{$field['model_name']} = self::cast_to_type($field['type'], $raw[$field['db_name']]);
+
+        if (is_null(static::DB_TABLE))
+            trigger_error('class '.get_class($this).' doesn\'t have DB_TABLE defined');
+    }
+
+    public function edit(array $fields) {
+        $db = getDb();
+
+        $model_upd = [];
+        $db_upd = [];
+
+        foreach ($fields as $name => $value) {
+            $index = self::$SpecCache[static::class]['db_name_map'][$name] ?? null;
+            if (is_null($index)) {
+                logError(__METHOD__.': field `'.$name.'` not found in '.static::class);
+                continue;
+            }
+
+            $field = self::$SpecCache[static::class]['fields'][$index];
+            switch ($field['type']) {
+                case Type::ARRAY:
+                    if (is_array($value)) {
+                        $db_upd[$name] = implode(',', $value);
+                        $model_upd[$field['model_name']] = $value;
+                    } else {
+                        logError(__METHOD__.': field `'.$name.'` is expected to be array. skipping.');
+                    }
+                    break;
+
+                case Type::INTEGER:
+                    $value = (int)$value;
+                    $db_upd[$name] = $value;
+                    $model_upd[$field['model_name']] = $value;
+                    break;
+
+                case Type::FLOAT:
+                    $value = (float)$value;
+                    $db_upd[$name] = $value;
+                    $model_upd[$field['model_name']] = $value;
+                    break;
+
+                case Type::BOOLEAN:
+                    $db_upd[$name] = $value ? 1 : 0;
+                    $model_upd[$field['model_name']] = $value;
+                    break;
+
+                case Type::JSON:
+                    $db_upd[$name] = json_encode($value, JSON_UNESCAPED_UNICODE);
+                    $model_upd[$field['model_name']] = $value;
+                    break;
+
+                case Type::SERIALIZED:
+                    $db_upd[$name] = serialize($value);
+                    $model_upd[$field['model_name']] = $value;
+                    break;
+
+                default:
+                    $value = (string)$value;
+                    $db_upd[$name] = $value;
+                    $model_upd[$field['model_name']] = $value;
+                    break;
+            }
+        }
+
+        if (!empty($db_upd) && !$db->update(static::DB_TABLE, $db_upd, static::DB_KEY."=?", $this->get_id())) {
+            logError(__METHOD__.': failed to update database');
+            return;
+        }
+
+        if (!empty($model_upd)) {
+            foreach ($model_upd as $name => $value)
+                $this->{$name} = $value;
+        }
+    }
+
+    public function get_id() {
+        return $this->{to_camel_case(static::DB_KEY)};
+    }
+
+    public function as_array(array $fields = [], array $custom_getters = []): array {
+        if (empty($fields))
+            $fields = array_keys(static::$SpecCache[static::class]['db_name_map']);
+
+        $array = [];
+        foreach ($fields as $field) {
+            if (isset($custom_getters[$field]) && is_callable($custom_getters[$field])) {
+                $array[$field] = $custom_getters[$field]();
+            } else {
+                $array[$field] = $this->{to_camel_case($field)};
+            }
+        }
+
+        return $array;
+    }
+
+    protected static function cast_to_type(Type $type, $value) {
+        switch ($type) {
+            case Type::BOOLEAN:
+                return (bool)$value;
+
+            case Type::INTEGER:
+                return (int)$value;
+
+            case Type::FLOAT:
+                return (float)$value;
+
+            case Type::ARRAY:
+                return array_filter(explode(',', $value));
+
+            case Type::JSON:
+                $val = json_decode($value, true);
+                if (!$val)
+                    $val = null;
+                return $val;
+
+            case Type::SERIALIZED:
+                $val = unserialize($value);
+                if ($val === false)
+                    $val = null;
+                return $val;
+
+            default:
+                return (string)$value;
+        }
+    }
+
+    protected static function get_spec(): array {
+        $rc = new ReflectionClass(static::class);
+        $props = $rc->getProperties(ReflectionProperty::IS_PUBLIC);
+
+        $list = [];
+        $index = 0;
+
+        $model_name_map = [];
+        $db_name_map = [];
+
+        foreach ($props as $prop) {
+            if ($prop->isStatic())
+                continue;
+
+            $name = $prop->getName();
+            if (str_starts_with($name, '_'))
+                continue;
+
+            $type = $prop->getType();
+            $phpdoc = $prop->getDocComment();
+
+            $mytype = null;
+            if (!$prop->hasType() && !$phpdoc)
+                $mytype = Type::STRING;
+            else {
+                $typename = $type->getName();
+                switch ($typename) {
+                    case 'string':
+                        $mytype = Type::STRING;
+                        break;
+                    case 'int':
+                        $mytype = Type::INTEGER;
+                        break;
+                    case 'float':
+                        $mytype = Type::FLOAT;
+                        break;
+                    case 'array':
+                        $mytype = Type::ARRAY;
+                        break;
+                    case 'bool':
+                        $mytype = Type::BOOLEAN;
+                        break;
+                }
+
+                if ($phpdoc != '') {
+                    $pos = strpos($phpdoc, '@');
+                    if ($pos === false)
+                        continue;
+
+                    if (substr($phpdoc, $pos+1, 4) == 'json')
+                        $mytype = Type::JSON;
+                    else if (substr($phpdoc, $pos+1, 5) == 'array')
+                        $mytype = Type::ARRAY;
+                    else if (substr($phpdoc, $pos+1, 10) == 'serialized')
+                        $mytype = Type::SERIALIZED;
+                }
+            }
+
+            if (is_null($mytype))
+                logError(__METHOD__.": ".$name." is still null in ".static::class);
+
+            $dbname = from_camel_case($name);
+            $list[] = [
+                'type' => $mytype,
+                'model_name' => $name,
+                'db_name' => $dbname
+            ];
+
+            $model_name_map[$name] = $index;
+            $db_name_map[$dbname] = $index;
+
+            $index++;
+        }
+
+        return [$list, $model_name_map, $db_name_map];
+    }
+
+}