<?php
/* 
The MIT License (MIT)
Copyright (c) 2018 AroDev 

www.arionum.com

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
OR OTHER DEALINGS IN THE SOFTWARE.
*/
require_once("include/init.inc.php");
$trx = new Transaction;
$block=new Block;
$q=$_GET['q'];
if(!empty($_POST['data'])){
    $data=json_decode(trim($_POST['data']),true);
    
 
}

if($_POST['coin']!=$_config['coin']) api_err("Invalid coin");
$ip=$_SERVER['REMOTE_ADDR'];
if($q=="peer"){
    
    $hostname = filter_var($data['hostname'], FILTER_SANITIZE_URL);
    
    if (!filter_var($hostname, FILTER_VALIDATE_URL)) api_err("invalid-hostname");

    $res=$db->single("SELECT COUNT(1) FROM peers WHERE hostname=:hostname AND ip=:ip",array(":hostname"=>$hostname,":ip"=>$ip));
    
    if($res==1){
         if($data['repeer']==1){
            $res=peer_post($hostname."/peer.php?q=peer",array("hostname"=>$_config['hostname']));
            if($res!==false) api_echo("re-peer-ok");
            else api_err("re-peer failed - $result");
         }
         api_echo("peer-ok-already");
    }
    $res=$db->single("SELECT COUNT(1) FROM peers WHERE blacklisted<UNIX_TIMESTAMP() AND ping >UNIX_TIMESTAMP()-86400 AND reserve=0");
    $reserve=1;
    if($res<$_config['max_peers']) $reserve=0;
    $db->run("INSERT ignore INTO peers SET hostname=:hostname, reserve=:reserve, ping=UNIX_TIMESTAMP(), ip=:ip ON DUPLICATE KEY UPDATE hostname=:hostname2",array(":ip"=>$ip, ":hostname2"=>$hostname,":hostname"=>$hostname, ":reserve"=>$reserve));
    
    $res=peer_post($hostname."/peer.php?q=peer",array("hostname"=>$_config['hostname']));
    if($res!==false) api_echo("re-peer-ok");
    else{ 
        $db->run("DELETE FROM peers WHERE ip=:ip",array(":ip"=>$ip));
        api_err("re-peer failed - $result");
    }
}
elseif($q=="ping"){
    api_echo("pong");
}


elseif($q=="submitTransaction"){
    if($_config['sanity_sync']==1) api_err("sanity-sync");
    
    $data['id']=san($data['id']);
   
    if(!$trx->check($data)) api_err("Invalid transaction");
    $hash=$data['id'];
    $res=$db->single("SELECT COUNT(1) FROM mempool WHERE id=:id",array(":id"=>$hash));
    if($res!=0) api_err("The transaction is already in mempool");
    
    $res=$db->single("SELECT COUNT(1) FROM mempool WHERE src=:src",array(":src"=>$data['src']));
    if($res>25) api_err("Too many transactions from this address in mempool. Please rebroadcast later.");
    $res=$db->single("SELECT COUNT(1) FROM mempool WHERE peer=:peer",array(":peer"=>$_SERVER['REMOTE_ADDR']));
    if($res>$_config['peer_max_mempool']) api_error("Too many transactions broadcasted from this peer");
    
    

    $res=$db->single("SELECT COUNT(1) FROM transactions WHERE id=:id",array(":id"=>$hash));
    if($res!=0) api_err("The transaction is already in a block");
    $acc=new Account;
    $src=$acc->get_address($data['public_key']);
    
    $balance=$db->single("SELECT balance FROM accounts WHERE id=:id",array(":id"=>$src));
    if($balance<$val+$fee) api_err("Not enough funds");
    
    
    $memspent=$db->single("SELECT SUM(val+fee) FROM mempool WHERE src=:src",array(":src"=>$src));
    if($balance-$memspent<$val+$fee) api_err("Not enough funds (mempool)");
    $trx->add_mempool($data, $_SERVER['REMOTE_ADDR']);
   
    $res=$db->row("SELECT COUNT(1) as c, sum(val) as v FROM  mempool ",array(":src"=>$data['src']));
    if($res['c']<$_config['max_mempool_rebroadcast']&&$res['v']/$res['c']<$data['val']) system("php propagate.php transaction '$data[id]' &>/dev/null &");
    api_echo("transaction-ok");
}
elseif($q=="submitBlock"){
    if($_config['sanity_sync']==1) api_err("sanity-sync");
    $data['id']=san($data['id']);
    $current=$block->current();
    if($current['id']==$data['id']) api_echo("block-ok");
    if($current['height']==$data['height']&&$current['id']!=$data['id']){
        $accept_new=false;
        if($current['transactions']<$data['transactions']){
            $accept_new=true;
        } elseif($current['transactions']==$data['transactions']) {
            $no1=hexdec(substr(coin2hex($current['id']),0,12));
            $no2=hexdec(substr(coin2hex($data['id']),0,12));
            if(gmp_cmp($no1,$no2)==1){
                $accept_new=true;
            }
        }
        if($accept_new){
            system("php sanity.php microsanity '$ip' &>/dev/null &");
            api_echo("microsanity");
        } else api_echo("reverse-microsanity");
    }

    if($current['height']!=$data['height']-1) {
        if($data['height']<$current['height']){ 
		$pr=$db->row("SELECT * FROM peers WHERE ip=:ip",array(":ip"=>$ip));
		if(!$pr) api_err("block-too-old");
		$peer_host=base58_encode($pr['hostname']);
		system("php propagate.php block current '$peer_host' '$pr[ip]'  &>/dev/null &");	
		api_err("block-too-old");
	}
        if($data['height']-$current['height']>150) api_err("block-out-of-sync");
        api_echo(array("request"=>"microsync","height"=>$current['height'], "block"=>$current['id']));
        
    }
    if(!$block->check($data)) api_err("invalid-block");
    $b=$data;
    $res=$block->add($b['height'], $b['public_key'], $b['nonce'], $b['data'], $b['date'], $b['signature'], $b['difficulty'], $b['reward_signature'], $b['argon']);	
   
    if(!$res) api_err("invalid-block-data");
    api_echo("block-ok");

    system("php propagate.php block '$data[id]' &>/dev/null &");

}

elseif($q=="currentBlock"){
   $current=$block->current();
    api_echo($current);
}
elseif($q=="getBlock"){
    $height=intval($data['height']);
    
    $export=$block->export("",$height);
    if(!$export) api_err("invalid-block");
     api_echo($export);
 }
 elseif($q=="getBlocks"){
    $height=intval($data['height']);
    
    $r=$db->run("SELECT id,height FROM blocks WHERE height>=:height ORDER by height ASC LIMIT 100",array(":height"=>$height));
    foreach($r as $x){
        $blocks[$x['height']]=$block->export($x['id']);
    }
    api_echo($blocks);

 }
 
 elseif($q=="getPeers"){
    $peers=$db->run("SELECT ip,hostname FROM peers WHERE blacklisted<UNIX_TIMESTAMP() ORDER by RAND()");
    api_echo($peers);
 } else {
     api_err("Invalid request");
 }
 
?>