<?php

namespace ActivityPhp\Type;

use ActivityPhp\Type;
use ActivityPhp\Type\TypeConfiguration as Config;
use Exception;

/**
 * \ActivityPhp\Type\ObjectAbstract is an abstract class for all
 * Activity Streams Core Types.
 *
 * @see https://www.w3.org/TR/activitystreams-core/#model
 */
abstract class AbstractObject
{
	/**
	 * Keep all properties values that have been set
	 *
	 * @var array
	 */
	private $_props = [];


	/**
	 * Standard setter method
	 * - Perform content validation if a validator exists
	 *
	 * @param  string $name
	 * @param  mixed  $value
	 * @return $this
	 */
	public function set($name, $value)
	{
		if ($name !== '@context'
		    && Config::get('undefined_properties') === 'strict'
		) {
		    $this->has($name, true);
		}

		// Validate given value
		if (! Validator::validate($name, $value, $this)) {
		    $message = "Rejected value. Type='%s', Property='%s', value='%s'";
		    throw new Exception(
		        sprintf(
		            $message,
		            static::class,
		            $name,
		            print_r($value, true)
		        )
		        . PHP_EOL
		    );
		}

		// @context has a special role
		if ($name === '@context') {
		    $this->_props[$name] = $value;

		// All modes and property defined
		} elseif ($this->has($name)) {
		    $this->_props[$name] = $this->transform($value);

		// Undefined property but we are in 'include' mode
		} elseif (Config::get('undefined_properties') === 'include') {
		    $this->_props[$name] = $this->transform($value);
		}

		return $this;
	}


	/**
	 * Affect a value to a property or an extended property
	 *
	 * @param  mixed $value
	 * @return mixed
	 */
	private function transform($value)
	{
		if (is_array($value)) {
		    if (isset($value['type'])) {
		        return Type::create($value);
		    } elseif (is_int(key($value))) {
		        return array_map(
		            static function ($value) {
		                return is_array($value) && isset($value['type'])
		                    ? Type::create($value)
		                    : $value;
		            },
		            $value
		        );
		    // Empty array, array that should not be casted as ActivityStreams types
		    } else {
		        return $value;
		    }
		} else {
		    // Scalars
		    return $value;
		}
	}


	/**
	 * Standard getter method
	 *
	 * @return mixed
	 */
	public function get(string $name)
	{
		if (Config::get('undefined_properties') === 'strict') {
		    $this->has($name, true);

		// Non strict mode returns null when property is not defined
		} elseif (! $this->has($name)) {
		    return null;
		}

		return $this->_props[$name];
	}


	/**
	 * Checks that property exists
	 */
	public function has(string $name, bool $strict = false): bool
	{
		if (property_exists($this, $name)) {
		    if (! array_key_exists($name, $this->_props)) {
		        $this->_props[$name] = $this->$name;
		    }

		    return true;
		}

		if (\array_key_exists($name, $this->_props)) {
		    return true;
		}

		if ($strict) {
		    // Defined properties
		    $allowed = Type::create($this->type)->getProperties();
		    sort($allowed);

		    throw new Exception(
		        sprintf(
		            'Property "%s" is not defined. Type="%s", ' .
		            'Class="%s"' . PHP_EOL . 'Allowed properties: %s',
		            $name,
		            $this->get('type'),
		            static::class,
		            implode(', ', $allowed)
		        )
		    );
		}

		return false;
	}


	/**
	 * Get a list of all properties names
	 *
	 * @return array
	 */
	public function getProperties()
	{
		return array_values(
		    array_unique(
		        array_merge(
		            array_keys($this->_props),
		            array_keys(
		                array_diff_key(
		                    get_object_vars($this),
		                    ['_props' => '1']
		                )
		            )
		        )
		    )
		);
	}


	/**
	 * Get a list of all properties and their values
	 * as an associative array.
	 * Null values are not returned.
	 */
	public function toArray(): array
	{
		$keys = array_keys(
		    array_filter(
		        get_object_vars($this),
		        static function ($value, $key): bool {
		            return ! is_null($value) && $key !== '_props';
		        },
		        ARRAY_FILTER_USE_BOTH
		    )
		);

		$stack = [];

		// native properties
		foreach ($keys as $key) {
		    if ($this->$key instanceof self) {
		        $stack[$key] = $this->$key->toArray();
		    } elseif (! is_array($this->$key)) {
		        $stack[$key] = $this->$key;
		    } elseif (is_array($this->$key)) {
		        if (is_int(key($this->$key))) {
		            $stack[$key] = array_map(
		                static function ($value) {
		                    return $value instanceof self
		                        ? $value->toArray()
		                        : $value;
		                },
		                $this->$key
		            );
		        } else {
		            $stack[$key] = $this->$key;
		        }
		    }
		}

		// _props
		foreach ($this->_props as $key => $value) {
		    if (is_null($value)) {
		        continue;
		    }

		    if ($value instanceof self) {
		        $stack[$key] = $value->toArray();
		    } elseif (! is_array($value)) {
		        $stack[$key] = $value;
		    } elseif (is_array($value)) {
		        if (is_int(key($value))) {
		            $stack[$key] = array_map(
		                static function ($value) {
		                    return $value instanceof self
		                        ? $value->toArray()
		                        : $value;
		                },
		                $value
		            );
		        } else {
		            $stack[$key] = $value;
		        }
		    }
		}

		return $stack;
	}


	/**
	 * Get a JSON
	 *
	 * @param int $options PHP JSON options
	 */
	public function toJson(?int $options = null): string
	{
		return json_encode(
		    $this->toArray(),
		    intval($options)
		);
	}


	/**
	 * Get a copy of current object and return a new instance
	 *
	 * @return self A new instance of this object
	 */
	public function copy(): self
	{
		return Type::create(
		    $this->type,
		    $this->toArray()
		);
	}


	/**
	 * Extend current type properties
	 *
	 * @param mixed  $default
	 */
	public function extend(string $property, mixed $default = null): void
	{
		if ($this->has($property)) {
		    return;
		}

		if (! \array_key_exists($property, $this->_props)) {
		    $this->_props[$property] = $default;
		}
	}


	/**
	 * Magical isset method
	 */
	public function __isset(string $name): bool
	{
		return property_exists($this, $name)
		    || \array_key_exists($name, $this->_props);
	}


	/**
	 * Magical setter method
	 *
	 * @param mixed  $value
	 */
	public function __set(string $name, $value): void
	{
		$this->set($name, $value);
	}


	/**
	 * Magical getter method
	 *
	 * @return mixed
	 */
	public function __get(string $name)
	{
		return $this->get($name);
	}


	/**
	 * Overloading methods
	 *
	 * @return mixed
	 */
	public function __call(string $name, ?array $arguments = [])
	{
		if (strpos($name, 'get') === 0) {
		    $attr = lcfirst(substr($name, 3));
		    return $this->get($attr);
		}

		// Setters
		if (strpos($name, 'set') === 0) {
		    if (count($arguments) === 1) {
		        $attr = lcfirst(substr($name, 3));
		        return $this->set($attr, $arguments[0]);
		    } else {
		        throw new Exception(
		            sprintf(
		                'Expected exactly one argument for method "%s()"',
		                $name
		            )
		        );
		    }
		}

		throw new Exception(
		    sprintf(
		        'Method "%s" is not defined',
		        $name
		    )
		);
	}
}
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