<?php

class Account {
	
	
	// inserts the account in the DB and updates the public key if empty
	public function add($public_key, $block){
		global $db;
		$id=$this->get_address($public_key);
		$bind=array(":id"=>$id, ":public_key"=>$public_key, ":block"=>$block,":public_key2"=>$public_key );
		
		$db->run("INSERT INTO accounts SET id=:id, public_key=:public_key, block=:block, balance=0 ON DUPLICATE KEY UPDATE public_key=if(public_key='',:public_key2,public_key)",$bind);
	}
	// inserts just the account without public key
	public function add_id($id, $block){
		global $db;
		$bind=array(":id"=>$id, ":block"=>$block);
		$db->run("INSERT ignore INTO accounts SET id=:id, public_key='', block=:block, balance=0",$bind);
	}
	// generates Account's address from the public key
	public function get_address($hash){

                //broken base58 addresses, which are block winners, missing the first 0 bytes from the address.
                if($hash=='PZ8Tyr4Nx8MHsRAGMpZmZ6TWY63dXWSCwCpspGFGQSaF9yVGLamBgymdf8M7FafghmP3oPzQb3W4PZsZApVa41uQrrHRVBH5p9bdoz7c6XeRQHK2TkzWR45e') return '22SoB29oyq2JhMxtBbesL7JioEYytyC6VeFmzvBH6fRQrueSvyZfEXR5oR7ajSQ9mLERn6JKU85EAbVDNChke32';
                elseif($hash=='PZ8Tyr4Nx8MHsRAGMpZmZ6TWY63dXWSCzbRyyz5oDNDKhk5jyjg4caRjkbqegMZMrUkuBjVMuYcVfPyc3aKuLmPHS4QEDjCrNGks7Z5oPxwv4yXSv7WJnkbL') return 'AoFnv3SLujrJSa2J7FDTADGD7Eb9kv3KtNAp7YVYQEUPcLE6cC6nLvvhVqcVnRLYF5BFF38C1DyunUtmfJBhyU';
                elseif($hash=='PZ8Tyr4Nx8MHsRAGMpZmZ6TWY63dXWSCyradtFFJoaYB4QdcXyBGSXjiASMMnofsT4f5ZNaxTnNDJt91ubemn3LzgKrfQh8CBpqaphkVNoRLub2ctdMnrzG1') return 'RncXQuc7S7aWkvTUJSHEFvYoV3ntAf7bfxEHjSiZNBvQV37MzZtg44L7GAV7szZ3uV8qWqikBewa3piZMqzBqm';
                elseif($hash=='PZ8Tyr4Nx8MHsRAGMpZmZ6TWY63dXWSCyjKMBY4ihhJ2G25EVezg7KnoCBVbhdvWfqzNA4LC5R7wgu3VNfJgvqkCq9sKKZcCoCpX6Qr9cN882MoXsfGTvZoj') return 'Rq53oLzpCrb4BdJZ1jqQ2zsixV2ukxVdM4H9uvUhCGJCz1q2wagvuXV4hC6UVwK7HqAt1FenukzhVXgzyG1y32';

		
		// hashes 9 times in sha512 (binary) and encodes in base58
	        for($i=0;$i<9;$i++) $hash=hash('sha512',$hash, true);					
		return base58_encode($hash);
        	

	}
	// checks the ecdsa secp256k1 signature for a specific public key
	public function check_signature($data, $signature, $public_key){
	
		return ec_verify($data ,$signature, $public_key);
	}

	// generates a new account and a public/private key pair
	public function generate_account(){
		// using secp256k1 curve for ECDSA
		$args = array(
			"curve_name" => "secp256k1",
			"private_key_type" => OPENSSL_KEYTYPE_EC,
		);
		
		// generates a new key pair
		$key1 = openssl_pkey_new($args);

		// exports the private key encoded as PEM
		openssl_pkey_export($key1, $pvkey);

		// converts the PEM to a base58 format
		$private_key= pem2coin($pvkey);

		// exports the private key encoded as PEM
		$pub = openssl_pkey_get_details($key1);
		
		// converts the PEM to a base58 format
		$public_key= pem2coin($pub['key']);
		
		// generates the account's address based on the public key
		$address=$this->get_address($public_key);
		return array("address"=>$address, "public_key"=>$public_key,"private_key"=>$private_key);


	}
	// check the validity of a base58 encoded key. At the moment, it checks only the characters to be base58.
	public function valid_key($id){
		$chars = str_split("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz");
		for($i=0;$i<strlen($id);$i++) if(!in_array($id[$i],$chars)) return false;

		return true;

	}
	// check the validity of an address. At the moment, it checks only the characters to be base58 and the length to be >=70 and <=128.
	public function valid($id){
		if(strlen($id)<70||strlen($id)>128) return false;
		$chars = str_split("123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz");
		for($i=0;$i<strlen($id);$i++) if(!in_array($id[$i],$chars)) return false;

		return true;

	}
	// returns the current account balance
	public function balance($id){
		global $db;
		$res=$db->single("SELECT balance FROM accounts WHERE id=:id",array(":id"=>$id));
		if($res===false) $res="0.00000000";
		return number_format($res,8,".","");
	}
	// returns the account balance - any pending debits from the mempool
	public function pending_balance($id){
		global $db;
		$res=$db->single("SELECT balance FROM accounts WHERE id=:id",array(":id"=>$id));
		if($res===false) $res="0.00000000";

		// if the original balance is 0, no mempool transactions are possible
		if($res=="0.00000000") return $res;
		$mem=$db->single("SELECT SUM(val+fee) FROM mempool WHERE src=:id",array(":id"=>$id));
		$rez=$res-$mem;
		return number_format($rez,8,".","");
		
	}
	// returns all the transactions of a specific address
	public function get_transactions($id,$limit=100){
		global $db;
		$block=new Block;
        	$current=$block->current();
		$public_key=$this->public_key($id);
		$limit=intval($limit);
		if($limit>100||$limit<1) $limit=100;
		$res=$db->run("SELECT * FROM transactions WHERE dst=:dst or public_key=:src ORDER by height DESC LIMIT :limit",array(":src"=>$public_key, ":dst"=>$id, ":limit"=>$limit));
		
		$transactions=array();
		foreach($res as $x){
			$trans=array("block"=>$x['block'],"height"=>$x['height'], "id"=>$x['id'],"dst"=>$x['dst'],"val"=>$x['val'],"fee"=>$x['fee'],"signature"=>$x['signature'], "message"=>$x['message'],"version"=>$x['version'],"date"=>$x['date'], "public_key"=>$x['public_key']);
			$trans['src']=$this->get_address($x['public_key']);
			$trans['confirmations']=$current['height']-$x['height'];
			
			// version 0 -> reward transaction, version 1 -> normal transaction
			if($x['version']==0) $trans['type']="mining";
			elseif($x['version']==1){
				if($x['dst']==$id) $trans['type']="credit";
				else $trans['type']="debit";
			} else {
				$trans['type']="other";
			}
			ksort($trans);
			$transactions[]=$trans;
		}
		return $transactions;
	}
	// returns the transactions from the mempool
	public function get_mempool_transactions($id){
		global $db;
		$transactions=array();
		$res=$db->run("SELECT * FROM mempool WHERE src=:src ORDER by height DESC LIMIT 100",array(":src"=>$id, ":dst"=>$id));
		foreach($res as $x){
			$trans=array("block"=>$x['block'],"height"=>$x['height'], "id"=>$x['id'],"src"=>$x['src'],"dst"=>$x['dst'],"val"=>$x['val'],"fee"=>$x['fee'],"signature"=>$x['signature'], "message"=>$x['message'],"version"=>$x['version'],"date"=>$x['date'], "public_key"=>$x['public_key']);
			$trans['type']="mempool";
			// they are unconfirmed, so they will have -1 confirmations.
			$trans['confirmations']=-1;
			ksort($trans);
			$transactions[]=$trans;
		}
		return $transactions;
	}
	// returns the public key for a specific account
	public function public_key($id){
		global $db;
		$res=$db->single("SELECT public_key FROM accounts WHERE id=:id",array(":id"=>$id));
		return $res;
	}
}


?>