<?php
/**
 * @brief		Coupon Node
 * @author		<a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
 * @copyright	(c) Invision Power Services, Inc.
 * @license		https://www.invisioncommunity.com/legal/standards/
 * @package		Invision Community
 * @subpackage	Nexus
 * @since		11 Mar 2014
 */

namespace IPS\nexus;

/* To prevent PHP errors (extending class does not exist) revealing path */
if ( !defined( '\IPS\SUITE_UNIQUE_KEY' ) )
{
	header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
	exit;
}

/**
 * Coupon Node
 */
class _Coupon extends \IPS\Node\Model
{
	/**
	 * @brief	[ActiveRecord] Multiton Store
	 */
	protected static $multitons;
	
	/**
	 * @brief	[ActiveRecord] Database Table
	 */
	public static $databaseTable = 'nexus_coupons';
	
	/**
	 * @brief	[ActiveRecord] Database Prefix
	 */
	public static $databasePrefix = 'c_';
			
	/**
	 * @brief	[Node] Node Title
	 */
	public static $nodeTitle = 'menu__nexus_store_coupons';
	
	/**
	 * @brief	[ActiveRecord] Database ID Fields
	 */
	protected static $databaseIdFields = array( 'c_code' );
	
	/**
	 * @brief	[ActiveRecord] Multiton Map
	 */
	protected static $multitonMap	= array();
	
	/**
	 * @brief	[Node] ACP Restrictions
	 * @code
	 	array(
	 		'app'		=> 'core',				// The application key which holds the restrictrions
	 		'module'	=> 'foo',				// The module key which holds the restrictions
	 		'map'		=> array(				// [Optional] The key for each restriction - can alternatively use "prefix"
	 			'add'			=> 'foo_add',
	 			'edit'			=> 'foo_edit',
	 			'permissions'	=> 'foo_perms',
	 			'delete'		=> 'foo_delete'
	 		),
	 		'all'		=> 'foo_manage',		// [Optional] The key to use for any restriction not provided in the map (only needed if not providing all 4)
	 		'prefix'	=> 'foo_',				// [Optional] Rather than specifying each  key in the map, you can specify a prefix, and it will automatically look for restrictions with the key "[prefix]_add/edit/permissions/delete"
	 * @endcode
	 */
	protected static $restrictions = array(
		'app'		=> 'nexus',
		'module'	=> 'store',
		'prefix'	=> 'coupons_',
	);
	
	/**
	 * [Node] Get title
	 *
	 * @return	string
	 */
	protected function get__title()
	{
		return $this->code;
	}
	
	/**
	 * [Node] Add/Edit Form
	 *
	 * @param	\IPS\Helpers\Form	$form	The form
	 * @return	void
	 */
	public function form( &$form )
	{
		$groups = array();
		foreach ( \IPS\Member\Group::groups() as $group )
		{
			$groups[ $group->g_id ] = $group->name;
		}
		
		if ( $this->id and $this->products !== '*' )
		{
			$products = array();
			foreach ( explode( ',', $this->products ) as $packageId )
			{
				try
				{
					$products[] = \IPS\nexus\Package::load( $packageId );
				}
				catch ( \OutOfRangeException $e ) { }
			}
		}
		else
		{
			$products = 0;
		}
		
		
		$form->addHeader( 'coupon_basic_settings' );
		$id = $this->id ?: NULL;
		$form->add( new \IPS\Helpers\Form\Text( 'c_code', $this->id ? $this->code : mb_strtoupper( mb_substr( md5( uniqid() ), 0, 5 ) ), TRUE, array( 'maxLength' => 25 ), function( $val ) use ( $id )
		{
			try
			{
				$coupon = \IPS\nexus\Coupon::load( $val, 'c_code' );
				if ( $coupon->id AND $coupon->id != $id )
				{
					throw new \DomainException('c_code_err');
				}
			}
			catch ( \OutOfRangeException $e ) {}
		} ) );
		$form->add( new \IPS\Helpers\Form\Radio( 'c_unit', $this->id ? $this->unit : 'v', TRUE, array( 'options' => array( 'v' => 'c_unit_v', 'p' => 'c_unit_p' ), 'toggles' => array( 'v' => array( 'c_discount_v' ), 'p' => array( 'c_discount_p', 'c_limit_discount' ) ) ) ) );
		$form->add( new \IPS\nexus\Form\Money( 'c_discount_v', $this->unit === 'v' ? $this->discount : NULL, NULL, array(), function( $val )
		{
			if ( !$val and \IPS\Request::i()->c_unit === 'v' )
			{
				throw new \DomainException('form_required');
			}
		}, NULL, NULL, 'c_discount_v' ) );
		$form->add( new \IPS\Helpers\Form\Number( 'c_discount_p', $this->unit === 'p' ? $this->discount : NULL, NULL, array( 'max' => 100 ), function( $val )
		{
			if ( !$val and \IPS\Request::i()->c_unit === 'p' )
			{
				throw new \DomainException('form_required');
			}
		}, NULL, '%', 'c_discount_p' ) );
		
		$form->addHeader( 'coupon_products' );
		$form->add( new \IPS\Helpers\Form\Node( 'c_products', $products, FALSE, array( 'class' => 'IPS\nexus\Package\Group', 'multiple' => TRUE, 'zeroVal' => 'no_restriction', 'zeroValTogglesOff' => array( 'c_renewals' ), 'permissionCheck' => function( $node )
		{
			return !( $node instanceof \IPS\nexus\Package\Group );
		} ) ) );
		$form->add( new \IPS\Helpers\Form\YesNo( 'c_renewals', $this->renewals ?: FALSE, FALSE, array(), NULL, NULL, NULL, 'c_renewals' ) );
		$form->add( new \IPS\Helpers\Form\Radio( 'c_limit_discount', $this->limit_discount, FALSE, array( 'options' => array( 0 => 'c_limit_discount_no', 1 => 'c_limit_discount_yes' ) ), NULL, NULL, NULL, 'c_limit_discount' ) );
		
		$form->addHeader( 'coupon_dates' );	
		$form->add( new \IPS\Helpers\Form\Date( 'c_start', $this->id ? $this->start : \IPS\DateTime::ts( time() ), TRUE, array( 'time' => TRUE ) ) );
		$form->add( new \IPS\Helpers\Form\Date( 'c_end', $this->id ? $this->end : 0, FALSE, array( 'time' => TRUE, 'unlimited' => 0, 'unlimitedLang' => 'no_end_date' ) ) );
		
		$form->addHeader( 'coupon_restrictions' );
		$form->add( new \IPS\Helpers\Form\YesNo( 'c_combine', $this->combine ) );
		$form->add( new \IPS\Helpers\Form\Number( 'c_uses', $this->id ? $this->uses : -1, FALSE, array( 'unlimited' => -1 ) ) );
		$form->add( new \IPS\Helpers\Form\Number( 'c_member_uses', $this->id ? $this->member_uses : 1, FALSE, array( 'unlimited' => -1 ) ) );
		$form->add( new \IPS\Helpers\Form\Select( 'c_groups', ( $this->id and $this->groups !== '*' ) ? explode( ',', $this->groups ) : '*', FALSE, array( 'options' => $groups, 'multiple' => TRUE, 'unlimited' => '*' ) ) );
		
	}
		
	/**
	 * [Node] Format form values from add/edit form for save
	 *
	 * @param	array	$values	Values from the form
	 * @return	array
	 */
	public function formatFormValues( $values )
	{
		if( isset( $values['c_unit'] ) )
		{
			$values['c_discount'] = $values['c_unit'] === 'v' ? json_encode( $values['c_discount_v'] ) : $values['c_discount_p'];

			unset( $values['c_discount_v'] );
			unset( $values['c_discount_p'] );
		}
		
		if( isset( $values['c_products'] ) )
		{
			if ( $values['c_products'] )
			{
				$products = array();
				foreach ( $values['c_products'] as $package )
				{
					$products[ $package->id ] = $package->id;
				}
				$values['c_products'] = implode( ',', $products );
			}
			else
			{
				$values['c_products'] = '*';
			}
		}
		
		if( isset( $values['c_start'] ) )
		{
			$values['c_start'] = $values['c_start']->getTimestamp();
		}

		if( isset( $values['c_end'] ) )
		{
			$values['c_end'] = $values['c_end'] ? $values['c_end']->getTimestamp() : 0;
		}
		
		if( isset( $values['c_groups'] ) )
		{
			$values['c_groups'] = is_array( $values['c_groups'] ) ? implode( ',', $values['c_groups'] ) : '*';
		}
		
		return $values;
	}
	
	/**
	 * [Node] Get buttons to display in tree
	 * Example code explains return value
	 *
	 * @code
	 	array(
	 		array(
	 			'icon'	=>	'plus-circle', // Name of FontAwesome icon to use
	 			'title'	=> 'foo',		// Language key to use for button's title parameter
	 			'link'	=> \IPS\Http\Url::internal( 'app=foo...' )	// URI to link to
	 			'class'	=> 'modalLink'	// CSS Class to use on link (Optional)
	 		),
	 		...							// Additional buttons
	 	);
	 * @endcode
	 * @param	string	$url		Base URL
	 * @param	bool	$subnode	Is this a subnode?
	 * @return	array
	 */
	public function getButtons( $url, $subnode=FALSE )
	{
		return array_merge( array(
			'view'	=> array(
				'icon'	=> 'search',
				'title'	=> 'view_coupon_uses',
				'link'	=> $url->setQueryString( array( 'do' => 'viewUses', 'id' => $this->id ) )
			),
		), parent::getButtons( $url, $subnode ) );
	}
	
	/**
	 * Use coupon
	 *
	 * @param	\IPS\nexus\Invoice	$invoice	Invoice to use against
	 * @param	\IPS\nexus\Customer	$customer	The customer using		
	 * @return	\IPS\nexus\extensions\nexus\Item\CouponDiscount
	 * @throws	\DomainException
	 */
	public function useCoupon( \IPS\nexus\Invoice $invoice, \IPS\nexus\Customer $customer )
	{
		/* Restricted to groups? */
		if ( $this->groups !== '*' )
		{
			$inGroup = FALSE;
			foreach ( explode( ',', $this->groups ) as $groupId )
			{
				if ( $customer->inGroup( $groupId ) )
				{
					$inGroup = TRUE;
					break;
				}
			}
			if ( !$inGroup )
			{
				throw new \DomainException( 'coupon_not_in_group' );
			}
		}
		
		/* Valid dates */
		if ( $this->start and $this->start > time() )
		{
			throw new \DomainException( 'coupon_not_started' );
		}
		if ( $this->end and $this->end < time() )
		{
			throw new \DomainException( 'coupon_expired' );
		}
		
		/* Maximum uses? */
		if ( $this->uses == 0 )
		{
			throw new \DomainException( 'coupon_expired' );
		}
		
		/* Maximum uses per member? */
		$uses = $this->used_by ? json_decode( $this->used_by, TRUE ) : array();
		$customerIdentifier = $customer->member_id ?: $invoice->guest_data['member']['email'];
		if ( $this->member_uses != -1 )
		{
			if ( isset( $uses[ $customerIdentifier ] ) and $uses[ $customerIdentifier ] >= $this->member_uses )
			{
				throw new \DomainException( 'coupon_exceeded_member_uses' );
			}
		}
		
		/* Use in conjunction with other coupons? */
		foreach ( $invoice->items as $item )
		{
			if ( $item instanceof \IPS\nexus\extensions\nexus\Item\CouponDiscount )
			{
				if ( $item->id === $this->id )
				{
					throw new \DomainException( 'coupon_already_used' );
				}
				else
				{
					if ( !$this->combine )
					{
						throw new \DomainException( $customer->language()->addToStack( 'coupon_not_in_conjunction', FALSE, array( 'sprintf' => array( $this->code ) ) ) );
					}
					else
					{
						try
						{
							$otherCoupon = static::load( $item->id );
							if ( !$otherCoupon->combine )
							{
								throw new \DomainException( $customer->language()->addToStack( 'coupon_not_in_conjunction', FALSE, array( 'sprintf' => array( $otherCoupon->code ) ) ) );
							}
						}
						catch ( \OutOfRangeException $e ) { }
					}
				}
			}
		}
		
		/* Restricted to products? */
		$items = NULL;
		if ( $this->products !== '*' )
		{
			$allowedProductIds = explode( ',', $this->products );
			$hasAllowedProduct = FALSE;
			$productTotal = new \IPS\Math\Number('0');
			
			$items = array();
			
			foreach ( $invoice->items as $k => $item )
			{
				if ( $item instanceof \IPS\nexus\extensions\nexus\Item\Package and in_array( $item->id, $allowedProductIds ) )
				{
					$hasAllowedProduct = TRUE;
					$productTotal = $productTotal->add( $item->price->amount->multiply( new \IPS\Math\Number("{$item->quantity}") ) );
					
					$items[] = $k;
				}
				elseif ( $this->renewals and $item instanceof \IPS\nexus\Invoice\Item\Renewal )
				{
					try
					{
						$purchase = \IPS\nexus\Purchase::load( $item->id );
						if ( $purchase->app == 'nexus' and $purchase->type == 'package' and in_array( $purchase->item_id, $allowedProductIds ) )
						{
							$hasAllowedProduct = TRUE;
							$productTotal = $productTotal->add( $item->price->amount );
							
							$items[] = $k;
						}
					}
					catch ( \OutOfRangeException $e ) { }
				}
			}
			
			if ( !$hasAllowedProduct )
			{
				throw new \DomainException( 'coupon_invalid_products' );
			}
		}
						
		/* How much are we taking off? */
		$discount = new \IPS\nexus\Money( 0, $invoice->currency );
		if ( $this->unit === 'v' )
		{
			$prices = json_decode( $this->discount, TRUE );
			if ( isset( $prices[ $invoice->currency ] ) )
			{
				$discount = new \IPS\nexus\Money( -$prices[ $invoice->currency ]['amount'], $invoice->currency );
			}
		}
		else
		{
			if ( $this->limit_discount and isset( $productTotal ) )
			{
				$base = $productTotal;
			}
			else
			{
				$summary = $invoice->summary();
				$base = $summary['subtotal']->amount;
			}
						
			$discount = new \IPS\nexus\Money( $base->percentage( new \IPS\Math\Number( $this->discount ) )->multiply( new \IPS\Math\Number( '-1' ) ), $invoice->currency );
		}
		
		/* Never allow a discount greater than the invoice total */
		if ( $discount->amount->multiply( new \IPS\Math\Number( '-1' ) )->compare( $invoice->total->amount ) === 1 )
		{
			$discount = new \IPS\nexus\Money( $invoice->total->amount->multiply( new \IPS\Math\Number( '-1' ) ), $invoice->currency );
		}
				
		/* Save that we've used it */
		if ( isset( $uses[ $customerIdentifier ] ) )
		{
			$uses[ $customerIdentifier ]++;
		}
		else
		{
			$uses[ $customerIdentifier ] = 1;
		}
		$this->used_by = json_encode( $uses );
		$this->save();
				
		/* Generate item */
		$item = new \IPS\nexus\extensions\nexus\Item\CouponDiscount( $this->code, $discount );
		$item->id = $this->id;
		$item->extra['usedBy'] = $customer->member_id;
		$item->extra['type'] = $this->unit;
		$item->extra['value'] = $this->unit === 'v' ? $discount->amount : $this->discount;
		$item->extra['items'] = $items;
		return $item;
	}
}