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package eth

import (
    "bytes"
    "container/list"
    "math"
    "math/big"
    "sync"
    "time"

    "github.com/ethereum/eth-go/ethchain"
    "github.com/ethereum/eth-go/ethlog"
    "github.com/ethereum/eth-go/ethutil"
    "github.com/ethereum/eth-go/ethwire"
)

var poollogger = ethlog.NewLogger("[BPOOL]")

type block struct {
    from      *Peer
    peer      *Peer
    block     *ethchain.Block
    reqAt     time.Time
    requested int
}

type BlockPool struct {
    mut sync.Mutex

    eth *Ethereum

    hashPool [][]byte
    pool     map[string]*block

    td   *big.Int
    quit chan bool

    ChainLength, BlocksProcessed int
}

func NewBlockPool(eth *Ethereum) *BlockPool {
    return &BlockPool{
        eth:  eth,
        pool: make(map[string]*block),
        td:   ethutil.Big0,
        quit: make(chan bool),
    }
}

func (self *BlockPool) Len() int {
    return len(self.hashPool)
}

func (self *BlockPool) HasLatestHash() bool {
    return self.pool[string(self.eth.BlockChain().CurrentBlock.Hash())] != nil
}

func (self *BlockPool) HasCommonHash(hash []byte) bool {
    return self.eth.BlockChain().GetBlock(hash) != nil
}

func (self *BlockPool) AddHash(hash []byte, peer *Peer) {
    if self.pool[string(hash)] == nil {
        self.pool[string(hash)] = &block{peer, nil, nil, time.Now(), 0}

        self.hashPool = append([][]byte{hash}, self.hashPool...)
    }
}

func (self *BlockPool) SetBlock(b *ethchain.Block, peer *Peer) {
    hash := string(b.Hash())

    if self.pool[hash] == nil && !self.eth.BlockChain().HasBlock(b.Hash()) {
        self.hashPool = append(self.hashPool, b.Hash())
        self.pool[hash] = &block{peer, peer, b, time.Now(), 0}
    } else if self.pool[hash] != nil {
        self.pool[hash].block = b
    }

    self.BlocksProcessed++
}

func (self *BlockPool) getParent(block *ethchain.Block) *ethchain.Block {
    for _, item := range self.pool {
        if item.block != nil {
            if bytes.Compare(item.block.Hash(), block.PrevHash) == 0 {
                return item.block
            }
        }
    }

    return nil
}

func (self *BlockPool) GetChainFromBlock(block *ethchain.Block) ethchain.Blocks {
    var blocks ethchain.Blocks

    for b := block; b != nil; b = self.getParent(b) {
        blocks = append(ethchain.Blocks{b}, blocks...)
    }

    return blocks
}

func (self *BlockPool) Blocks() (blocks ethchain.Blocks) {
    for _, item := range self.pool {
        if item.block != nil {
            blocks = append(blocks, item.block)
        }
    }

    return
}

func (self *BlockPool) ProcessCanonical(f func(block *ethchain.Block)) (procAmount int) {
    blocks := self.Blocks()

    ethchain.BlockBy(ethchain.Number).Sort(blocks)
    for _, block := range blocks {
        if self.eth.BlockChain().HasBlock(block.PrevHash) {
            procAmount++

            f(block)

            hash := block.Hash()
            self.hashPool = ethutil.DeleteFromByteSlice(self.hashPool, hash)
            delete(self.pool, string(hash))
        }

    }

    return
}

func (self *BlockPool) DistributeHashes() {
    var (
        peerLen = self.eth.peers.Len()
        amount  = 200 * peerLen
        dist    = make(map[*Peer][][]byte)
    )

    num := int(math.Min(float64(amount), float64(len(self.pool))))
    for i, j := 0, 0; i < len(self.hashPool) && j < num; i++ {
        hash := self.hashPool[i]
        item := self.pool[string(hash)]

        if item != nil && item.block == nil {
            var peer *Peer
            lastFetchFailed := time.Since(item.reqAt) > 5*time.Second

            // Handle failed requests
            if lastFetchFailed && item.requested > 0 && item.peer != nil {
                if item.requested < 100 {
                    // Select peer the hash was retrieved off
                    peer = item.from
                } else {
                    // Remove it
                    self.hashPool = ethutil.DeleteFromByteSlice(self.hashPool, hash)
                    delete(self.pool, string(hash))
                }
            } else if lastFetchFailed || item.peer == nil {
                // Find a suitable, available peer
                eachPeer(self.eth.peers, func(p *Peer, v *list.Element) {
                    if peer == nil && len(dist[p]) < amount/peerLen {
                        peer = p
                    }
                })
            }

            if peer != nil {
                item.reqAt = time.Now()
                item.peer = peer
                item.requested++

                dist[peer] = append(dist[peer], hash)
            }
        }
    }

    for peer, hashes := range dist {
        peer.FetchBlocks(hashes)
    }
}

func (self *BlockPool) Start() {
    go self.update()
}

func (self *BlockPool) Stop() {
    close(self.quit)
}

func (self *BlockPool) update() {
    serviceTimer := time.NewTicker(100 * time.Millisecond)
    procTimer := time.NewTicker(500 * time.Millisecond)
out:
    for {
        select {
        case <-self.quit:
            break out
        case <-serviceTimer.C:
            // Check if we're catching up. If not distribute the hashes to
            // the peers and download the blockchain
            done := true
            eachPeer(self.eth.peers, func(p *Peer, v *list.Element) {
                if p.statusKnown && p.FetchingHashes() {
                    done = false
                }
            })

            if done && len(self.hashPool) > 0 {
                self.DistributeHashes()
            }

            if self.ChainLength < len(self.hashPool) {
                self.ChainLength = len(self.hashPool)
            }
        case <-procTimer.C:
            // XXX We can optimize this lifting this on to a new goroutine.
            // We'd need to make sure that the pools are properly protected by a mutex
            amount := self.ProcessCanonical(func(block *ethchain.Block) {
                err := self.eth.StateManager().Process(block, false)
                if err != nil {
                    poollogger.Infoln(err)
                }
            })

            // Do not propagate to the network on catchups
            if amount == 1 {
                block := self.eth.BlockChain().CurrentBlock
                self.eth.Broadcast(ethwire.MsgBlockTy, []interface{}{block.Value().Val})
            }
        }
    }
}