package historydb

import (
	"errors"
	"fmt"

	ethCommon "github.com/ethereum/go-ethereum/common"
	"github.com/hermeznetwork/hermez-node/common"
	"github.com/hermeznetwork/hermez-node/db"
	"github.com/hermeznetwork/tracerr"
	"github.com/iden3/go-iden3-crypto/babyjub"
	"github.com/jmoiron/sqlx"
	"github.com/russross/meddler"
)

// GetLastBlockAPI retrieve the block with the highest block number from the DB
func (hdb *HistoryDB) GetLastBlockAPI() (*common.Block, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	return hdb.GetLastBlock()
}

// GetBatchAPI return the batch with the given batchNum
func (hdb *HistoryDB) GetBatchAPI(batchNum common.BatchNum) (*BatchAPI, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	batch := &BatchAPI{}
	return batch, tracerr.Wrap(meddler.QueryRow(
		hdb.dbRead, batch,
		`SELECT batch.item_id, batch.batch_num, batch.eth_block_num,
		batch.forger_addr, batch.fees_collected, batch.total_fees_usd, batch.state_root,
		batch.num_accounts, batch.exit_root, batch.forge_l1_txs_num, batch.slot_num,
		block.timestamp, block.hash,
	    COALESCE ((SELECT COUNT(*) FROM tx WHERE batch_num = batch.batch_num), 0) AS forged_txs
	    FROM batch INNER JOIN block ON batch.eth_block_num = block.eth_block_num
	 	WHERE batch_num = $1;`, batchNum,
	))
}

// GetBatchesAPI return the batches applying the given filters
func (hdb *HistoryDB) GetBatchesAPI(
	minBatchNum, maxBatchNum, slotNum *uint,
	forgerAddr *ethCommon.Address,
	fromItem, limit *uint, order string,
) ([]BatchAPI, uint64, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	var query string
	var args []interface{}
	queryStr := `SELECT batch.item_id, batch.batch_num, batch.eth_block_num,
	batch.forger_addr, batch.fees_collected, batch.total_fees_usd, batch.state_root,
	batch.num_accounts, batch.exit_root, batch.forge_l1_txs_num, batch.slot_num,
	block.timestamp, block.hash,
	COALESCE ((SELECT COUNT(*) FROM tx WHERE batch_num = batch.batch_num), 0) AS forged_txs,
	count(*) OVER() AS total_items
	FROM batch INNER JOIN block ON batch.eth_block_num = block.eth_block_num `
	// Apply filters
	nextIsAnd := false
	// minBatchNum filter
	if minBatchNum != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "batch.batch_num > ? "
		args = append(args, minBatchNum)
		nextIsAnd = true
	}
	// maxBatchNum filter
	if maxBatchNum != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "batch.batch_num < ? "
		args = append(args, maxBatchNum)
		nextIsAnd = true
	}
	// slotNum filter
	if slotNum != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "batch.slot_num = ? "
		args = append(args, slotNum)
		nextIsAnd = true
	}
	// forgerAddr filter
	if forgerAddr != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "batch.forger_addr = ? "
		args = append(args, forgerAddr)
		nextIsAnd = true
	}
	// pagination
	if fromItem != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		if order == OrderAsc {
			queryStr += "batch.item_id >= ? "
		} else {
			queryStr += "batch.item_id <= ? "
		}
		args = append(args, fromItem)
	}
	queryStr += "ORDER BY batch.item_id "
	if order == OrderAsc {
		queryStr += " ASC "
	} else {
		queryStr += " DESC "
	}
	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
	query = hdb.dbRead.Rebind(queryStr)
	// log.Debug(query)
	batchPtrs := []*BatchAPI{}
	if err := meddler.QueryAll(hdb.dbRead, &batchPtrs, query, args...); err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	batches := db.SlicePtrsToSlice(batchPtrs).([]BatchAPI)
	if len(batches) == 0 {
		return batches, 0, nil
	}
	return batches, batches[0].TotalItems - uint64(len(batches)), nil
}

// GetBestBidAPI returns the best bid in specific slot by slotNum
func (hdb *HistoryDB) GetBestBidAPI(slotNum *int64) (BidAPI, error) {
	bid := &BidAPI{}
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return *bid, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	err = meddler.QueryRow(
		hdb.dbRead, bid, `SELECT bid.*, block.timestamp, coordinator.forger_addr, coordinator.url 
		FROM bid INNER JOIN block ON bid.eth_block_num = block.eth_block_num
		INNER JOIN (
			SELECT bidder_addr, MAX(item_id) AS item_id FROM coordinator
			GROUP BY bidder_addr
		) c ON bid.bidder_addr = c.bidder_addr 
		INNER JOIN coordinator ON c.item_id = coordinator.item_id 
		WHERE slot_num = $1 ORDER BY item_id DESC LIMIT 1;`, slotNum,
	)
	return *bid, tracerr.Wrap(err)
}

// GetBestBidsAPI returns the best bid in specific slot by slotNum
func (hdb *HistoryDB) GetBestBidsAPI(
	minSlotNum, maxSlotNum *int64,
	bidderAddr *ethCommon.Address,
	limit *uint, order string,
) ([]BidAPI, uint64, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	var query string
	var args []interface{}
	// JOIN the best bid of each slot with the latest update of each coordinator
	queryStr := `SELECT b.*, block.timestamp, coordinator.forger_addr, coordinator.url, 
	COUNT(*) OVER() AS total_items FROM (
	   SELECT slot_num, MAX(item_id) as maxitem 
	   FROM bid GROUP BY slot_num
	)
	AS x INNER JOIN bid AS b ON b.item_id = x.maxitem
	INNER JOIN block ON b.eth_block_num = block.eth_block_num
	INNER JOIN (
		SELECT bidder_addr, MAX(item_id) AS item_id FROM coordinator
		GROUP BY bidder_addr
	) c ON b.bidder_addr = c.bidder_addr 
	INNER JOIN coordinator ON c.item_id = coordinator.item_id 
	WHERE (b.slot_num >= ? AND b.slot_num <= ?)`
	args = append(args, minSlotNum)
	args = append(args, maxSlotNum)
	// Apply filters
	if bidderAddr != nil {
		queryStr += " AND b.bidder_addr = ? "
		args = append(args, bidderAddr)
	}
	queryStr += " ORDER BY b.slot_num "
	if order == OrderAsc {
		queryStr += "ASC "
	} else {
		queryStr += "DESC "
	}
	if limit != nil {
		queryStr += fmt.Sprintf("LIMIT %d;", *limit)
	}
	query = hdb.dbRead.Rebind(queryStr)
	bidPtrs := []*BidAPI{}
	if err := meddler.QueryAll(hdb.dbRead, &bidPtrs, query, args...); err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	// log.Debug(query)
	bids := db.SlicePtrsToSlice(bidPtrs).([]BidAPI)
	if len(bids) == 0 {
		return bids, 0, nil
	}
	return bids, bids[0].TotalItems - uint64(len(bids)), nil
}

// GetBidsAPI return the bids applying the given filters
func (hdb *HistoryDB) GetBidsAPI(
	slotNum *int64, bidderAddr *ethCommon.Address,
	fromItem, limit *uint, order string,
) ([]BidAPI, uint64, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	var query string
	var args []interface{}
	// JOIN each bid with the latest update of each coordinator
	queryStr := `SELECT bid.*, block.timestamp, coord.forger_addr, coord.url, 
	COUNT(*) OVER() AS total_items
	FROM bid INNER JOIN block ON bid.eth_block_num = block.eth_block_num 
	INNER JOIN (
		SELECT bidder_addr, MAX(item_id) AS item_id FROM coordinator
		GROUP BY bidder_addr
	) c ON bid.bidder_addr = c.bidder_addr 
	INNER JOIN coordinator coord ON c.item_id = coord.item_id `
	// Apply filters
	nextIsAnd := false
	// slotNum filter
	if slotNum != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "bid.slot_num = ? "
		args = append(args, slotNum)
		nextIsAnd = true
	}
	// bidder filter
	if bidderAddr != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "bid.bidder_addr = ? "
		args = append(args, bidderAddr)
		nextIsAnd = true
	}
	if fromItem != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		if order == OrderAsc {
			queryStr += "bid.item_id >= ? "
		} else {
			queryStr += "bid.item_id <= ? "
		}
		args = append(args, fromItem)
	}
	// pagination
	queryStr += "ORDER BY bid.item_id "
	if order == OrderAsc {
		queryStr += "ASC "
	} else {
		queryStr += "DESC "
	}
	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
	query, argsQ, err := sqlx.In(queryStr, args...)
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	query = hdb.dbRead.Rebind(query)
	bids := []*BidAPI{}
	if err := meddler.QueryAll(hdb.dbRead, &bids, query, argsQ...); err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	if len(bids) == 0 {
		return []BidAPI{}, 0, nil
	}
	return db.SlicePtrsToSlice(bids).([]BidAPI), bids[0].TotalItems - uint64(len(bids)), nil
}

// GetTokenAPI returns a token from the DB given a TokenID
func (hdb *HistoryDB) GetTokenAPI(tokenID common.TokenID) (*TokenWithUSD, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	return hdb.GetToken(tokenID)
}

// GetTokensAPI returns a list of tokens from the DB
func (hdb *HistoryDB) GetTokensAPI(
	ids []common.TokenID, symbols []string, name string, fromItem,
	limit *uint, order string,
) ([]TokenWithUSD, uint64, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	var query string
	var args []interface{}
	queryStr := `SELECT * , COUNT(*) OVER() AS total_items FROM token `
	// Apply filters
	nextIsAnd := false
	if len(ids) > 0 {
		queryStr += "WHERE token_id IN (?) "
		nextIsAnd = true
		args = append(args, ids)
	}
	if len(symbols) > 0 {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "symbol IN (?) "
		args = append(args, symbols)
		nextIsAnd = true
	}
	if name != "" {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "name ~ ? "
		args = append(args, name)
		nextIsAnd = true
	}
	if fromItem != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		if order == OrderAsc {
			queryStr += "item_id >= ? "
		} else {
			queryStr += "item_id <= ? "
		}
		args = append(args, fromItem)
	}
	// pagination
	queryStr += "ORDER BY item_id "
	if order == OrderAsc {
		queryStr += "ASC "
	} else {
		queryStr += "DESC "
	}
	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
	query, argsQ, err := sqlx.In(queryStr, args...)
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	query = hdb.dbRead.Rebind(query)
	tokens := []*TokenWithUSD{}
	if err := meddler.QueryAll(hdb.dbRead, &tokens, query, argsQ...); err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	if len(tokens) == 0 {
		return []TokenWithUSD{}, 0, nil
	}
	return db.SlicePtrsToSlice(tokens).([]TokenWithUSD), uint64(len(tokens)) - tokens[0].TotalItems, nil
}

// GetTxAPI returns a tx from the DB given a TxID
func (hdb *HistoryDB) GetTxAPI(txID common.TxID) (*TxAPI, error) {
	// Warning: amount_success and deposit_amount_success have true as default for
	// performance reasons. The expected default value is false (when txs are unforged)
	// this case is handled at the function func (tx TxAPI) MarshalJSON() ([]byte, error)
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	tx := &TxAPI{}
	err = meddler.QueryRow(
		hdb.dbRead, tx, `SELECT tx.item_id, tx.is_l1, tx.id, tx.type, tx.position, 
		hez_idx(tx.effective_from_idx, token.symbol) AS from_idx, tx.from_eth_addr, tx.from_bjj,
		hez_idx(tx.to_idx, token.symbol) AS to_idx, tx.to_eth_addr, tx.to_bjj,
		tx.amount, tx.amount_success, tx.token_id, tx.amount_usd, 
		tx.batch_num, tx.eth_block_num, tx.to_forge_l1_txs_num, tx.user_origin, 
		tx.deposit_amount, tx.deposit_amount_usd, tx.deposit_amount_success, tx.fee, tx.fee_usd, tx.nonce,
		token.token_id, token.item_id AS token_item_id, token.eth_block_num AS token_block,
		token.eth_addr, token.name, token.symbol, token.decimals, token.usd,
		token.usd_update, block.timestamp
		FROM tx INNER JOIN token ON tx.token_id = token.token_id 
		INNER JOIN block ON tx.eth_block_num = block.eth_block_num 
		WHERE tx.id = $1;`, txID,
	)
	return tx, tracerr.Wrap(err)
}

// GetTxsAPI returns a list of txs from the DB using the HistoryTx struct
// and pagination info
func (hdb *HistoryDB) GetTxsAPI(
	ethAddr *ethCommon.Address, bjj *babyjub.PublicKeyComp,
	tokenID *common.TokenID, idx *common.Idx, batchNum *uint, txType *common.TxType,
	fromItem, limit *uint, order string,
) ([]TxAPI, uint64, error) {
	// Warning: amount_success and deposit_amount_success have true as default for
	// performance reasons. The expected default value is false (when txs are unforged)
	// this case is handled at the function func (tx TxAPI) MarshalJSON() ([]byte, error)
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	if ethAddr != nil && bjj != nil {
		return nil, 0, tracerr.Wrap(errors.New("ethAddr and bjj are incompatible"))
	}
	var query string
	var args []interface{}
	queryStr := `SELECT tx.item_id, tx.is_l1, tx.id, tx.type, tx.position, 
	hez_idx(tx.effective_from_idx, token.symbol) AS from_idx, tx.from_eth_addr, tx.from_bjj,
	hez_idx(tx.to_idx, token.symbol) AS to_idx, tx.to_eth_addr, tx.to_bjj,
	tx.amount, tx.amount_success, tx.token_id, tx.amount_usd, 
	tx.batch_num, tx.eth_block_num, tx.to_forge_l1_txs_num, tx.user_origin, 
	tx.deposit_amount, tx.deposit_amount_usd, tx.deposit_amount_success, tx.fee, tx.fee_usd, tx.nonce,
	token.token_id, token.item_id AS token_item_id, token.eth_block_num AS token_block,
	token.eth_addr, token.name, token.symbol, token.decimals, token.usd,
	token.usd_update, block.timestamp, count(*) OVER() AS total_items 
	FROM tx INNER JOIN token ON tx.token_id = token.token_id 
	INNER JOIN block ON tx.eth_block_num = block.eth_block_num `
	// Apply filters
	nextIsAnd := false
	// ethAddr filter
	if ethAddr != nil {
		queryStr += "WHERE (tx.from_eth_addr = ? OR tx.to_eth_addr = ?) "
		nextIsAnd = true
		args = append(args, ethAddr, ethAddr)
	} else if bjj != nil { // bjj filter
		queryStr += "WHERE (tx.from_bjj = ? OR tx.to_bjj = ?) "
		nextIsAnd = true
		args = append(args, bjj, bjj)
	}
	// tokenID filter
	if tokenID != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "tx.token_id = ? "
		args = append(args, tokenID)
		nextIsAnd = true
	}
	// idx filter
	if idx != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "(tx.effective_from_idx = ? OR tx.to_idx = ?) "
		args = append(args, idx, idx)
		nextIsAnd = true
	}
	// batchNum filter
	if batchNum != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "tx.batch_num = ? "
		args = append(args, batchNum)
		nextIsAnd = true
	}
	// txType filter
	if txType != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "tx.type = ? "
		args = append(args, txType)
		nextIsAnd = true
	}
	if fromItem != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		if order == OrderAsc {
			queryStr += "tx.item_id >= ? "
		} else {
			queryStr += "tx.item_id <= ? "
		}
		args = append(args, fromItem)
		nextIsAnd = true
	}
	if nextIsAnd {
		queryStr += "AND "
	} else {
		queryStr += "WHERE "
	}
	queryStr += "tx.batch_num IS NOT NULL "

	// pagination
	queryStr += "ORDER BY tx.item_id "
	if order == OrderAsc {
		queryStr += " ASC "
	} else {
		queryStr += " DESC "
	}
	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
	query = hdb.dbRead.Rebind(queryStr)
	// log.Debug(query)
	txsPtrs := []*TxAPI{}
	if err := meddler.QueryAll(hdb.dbRead, &txsPtrs, query, args...); err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	txs := db.SlicePtrsToSlice(txsPtrs).([]TxAPI)
	if len(txs) == 0 {
		return txs, 0, nil
	}
	return txs, txs[0].TotalItems - uint64(len(txs)), nil
}

// GetExitAPI returns a exit from the DB
func (hdb *HistoryDB) GetExitAPI(batchNum *uint, idx *common.Idx) (*ExitAPI, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	exit := &ExitAPI{}
	err = meddler.QueryRow(
		hdb.dbRead, exit, `SELECT exit_tree.item_id, exit_tree.batch_num,
		hez_idx(exit_tree.account_idx, token.symbol) AS account_idx,
		account.bjj, account.eth_addr,
		exit_tree.merkle_proof, exit_tree.balance, exit_tree.instant_withdrawn,
		exit_tree.delayed_withdraw_request, exit_tree.delayed_withdrawn,
		token.token_id, token.item_id AS token_item_id, 
		token.eth_block_num AS token_block, token.eth_addr AS token_eth_addr, token.name, token.symbol, 
		token.decimals, token.usd, token.usd_update
		FROM exit_tree INNER JOIN account ON exit_tree.account_idx = account.idx 
		INNER JOIN token ON account.token_id = token.token_id 
		WHERE exit_tree.batch_num = $1 AND exit_tree.account_idx = $2;`, batchNum, idx,
	)
	return exit, tracerr.Wrap(err)
}

// GetExitsAPI returns a list of exits from the DB and pagination info
func (hdb *HistoryDB) GetExitsAPI(
	ethAddr *ethCommon.Address, bjj *babyjub.PublicKeyComp, tokenID *common.TokenID,
	idx *common.Idx, batchNum *uint, onlyPendingWithdraws *bool,
	fromItem, limit *uint, order string,
) ([]ExitAPI, uint64, error) {
	if ethAddr != nil && bjj != nil {
		return nil, 0, tracerr.Wrap(errors.New("ethAddr and bjj are incompatible"))
	}
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	var query string
	var args []interface{}
	queryStr := `SELECT exit_tree.item_id, exit_tree.batch_num,
	hez_idx(exit_tree.account_idx, token.symbol) AS account_idx,
	account.bjj, account.eth_addr,
	exit_tree.merkle_proof, exit_tree.balance, exit_tree.instant_withdrawn,
	exit_tree.delayed_withdraw_request, exit_tree.delayed_withdrawn,
	token.token_id, token.item_id AS token_item_id,
	token.eth_block_num AS token_block, token.eth_addr AS token_eth_addr, token.name, token.symbol,
	token.decimals, token.usd, token.usd_update, COUNT(*) OVER() AS total_items
	FROM exit_tree INNER JOIN account ON exit_tree.account_idx = account.idx 
	INNER JOIN token ON account.token_id = token.token_id `
	// Apply filters
	nextIsAnd := false
	// ethAddr filter
	if ethAddr != nil {
		queryStr += "WHERE account.eth_addr = ? "
		nextIsAnd = true
		args = append(args, ethAddr)
	} else if bjj != nil { // bjj filter
		queryStr += "WHERE account.bjj = ? "
		nextIsAnd = true
		args = append(args, bjj)
	}
	// tokenID filter
	if tokenID != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "account.token_id = ? "
		args = append(args, tokenID)
		nextIsAnd = true
	}
	// idx filter
	if idx != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "exit_tree.account_idx = ? "
		args = append(args, idx)
		nextIsAnd = true
	}
	// batchNum filter
	if batchNum != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "exit_tree.batch_num = ? "
		args = append(args, batchNum)
		nextIsAnd = true
	}
	// onlyPendingWithdraws
	if onlyPendingWithdraws != nil {
		if *onlyPendingWithdraws {
			if nextIsAnd {
				queryStr += "AND "
			} else {
				queryStr += "WHERE "
			}
			queryStr += "(exit_tree.instant_withdrawn IS NULL AND exit_tree.delayed_withdrawn IS NULL) "
			nextIsAnd = true
		}
	}
	if fromItem != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		if order == OrderAsc {
			queryStr += "exit_tree.item_id >= ? "
		} else {
			queryStr += "exit_tree.item_id <= ? "
		}
		args = append(args, fromItem)
		// nextIsAnd = true
	}
	// pagination
	queryStr += "ORDER BY exit_tree.item_id "
	if order == OrderAsc {
		queryStr += " ASC "
	} else {
		queryStr += " DESC "
	}
	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
	query = hdb.dbRead.Rebind(queryStr)
	// log.Debug(query)
	exits := []*ExitAPI{}
	if err := meddler.QueryAll(hdb.dbRead, &exits, query, args...); err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	if len(exits) == 0 {
		return []ExitAPI{}, 0, nil
	}
	return db.SlicePtrsToSlice(exits).([]ExitAPI), exits[0].TotalItems - uint64(len(exits)), nil
}

// GetBucketUpdatesAPI retrieves latest values for each bucket
func (hdb *HistoryDB) GetBucketUpdatesAPI() ([]BucketUpdateAPI, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	var bucketUpdates []*BucketUpdateAPI
	err = meddler.QueryAll(
		hdb.dbRead, &bucketUpdates,
		`SELECT num_bucket, withdrawals FROM bucket_update 
		WHERE item_id in(SELECT max(item_id) FROM bucket_update 
		group by num_bucket) 
		ORDER BY num_bucket ASC;`,
	)
	return db.SlicePtrsToSlice(bucketUpdates).([]BucketUpdateAPI), tracerr.Wrap(err)
}

// GetCoordinatorsAPI returns a list of coordinators from the DB and pagination info
func (hdb *HistoryDB) GetCoordinatorsAPI(
	bidderAddr, forgerAddr *ethCommon.Address,
	fromItem, limit *uint, order string,
) ([]CoordinatorAPI, uint64, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	var query string
	var args []interface{}
	queryStr := `SELECT coordinator.*, COUNT(*) OVER() AS total_items
	FROM coordinator INNER JOIN (
		SELECT MAX(item_id) AS item_id FROM coordinator
		GROUP BY bidder_addr
	) c ON coordinator.item_id = c.item_id `
	// Apply filters
	nextIsAnd := false
	if bidderAddr != nil {
		queryStr += "WHERE bidder_addr = ? "
		nextIsAnd = true
		args = append(args, bidderAddr)
	}
	if forgerAddr != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "forger_addr = ? "
		nextIsAnd = true
		args = append(args, forgerAddr)
	}
	if fromItem != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		if order == OrderAsc {
			queryStr += "coordinator.item_id >= ? "
		} else {
			queryStr += "coordinator.item_id <= ? "
		}
		args = append(args, fromItem)
	}
	// pagination
	queryStr += "ORDER BY coordinator.item_id "
	if order == OrderAsc {
		queryStr += " ASC "
	} else {
		queryStr += " DESC "
	}
	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
	query = hdb.dbRead.Rebind(queryStr)

	coordinators := []*CoordinatorAPI{}
	if err := meddler.QueryAll(hdb.dbRead, &coordinators, query, args...); err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	if len(coordinators) == 0 {
		return []CoordinatorAPI{}, 0, nil
	}
	return db.SlicePtrsToSlice(coordinators).([]CoordinatorAPI),
		coordinators[0].TotalItems - uint64(len(coordinators)), nil
}

// GetAuctionVarsAPI returns auction variables
func (hdb *HistoryDB) GetAuctionVarsAPI() (*common.AuctionVariables, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	auctionVars := &common.AuctionVariables{}
	err = meddler.QueryRow(
		hdb.dbRead, auctionVars, `SELECT * FROM auction_vars;`,
	)
	return auctionVars, tracerr.Wrap(err)
}

// GetAuctionVarsUntilSetSlotNumAPI returns all the updates of the auction vars
// from the last entry in which DefaultSlotSetBidSlotNum <= slotNum
func (hdb *HistoryDB) GetAuctionVarsUntilSetSlotNumAPI(slotNum int64, maxItems int) ([]MinBidInfo, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	auctionVars := []*MinBidInfo{}
	query := `
		SELECT DISTINCT default_slot_set_bid, default_slot_set_bid_slot_num FROM auction_vars
		WHERE default_slot_set_bid_slot_num < $1
		ORDER BY default_slot_set_bid_slot_num DESC
		LIMIT $2;
	`
	err = meddler.QueryAll(hdb.dbRead, &auctionVars, query, slotNum, maxItems)
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	return db.SlicePtrsToSlice(auctionVars).([]MinBidInfo), nil
}

// GetAccountAPI returns an account by its index
func (hdb *HistoryDB) GetAccountAPI(idx common.Idx) (*AccountAPI, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	account := &AccountAPI{}
	err = meddler.QueryRow(hdb.dbRead, account, `SELECT account.item_id, hez_idx(account.idx, 
		token.symbol) as idx, account.batch_num, account.bjj, account.eth_addr,
		token.token_id, token.item_id AS token_item_id, token.eth_block_num AS token_block,
		token.eth_addr as token_eth_addr, token.name, token.symbol, token.decimals, token.usd,
		token.usd_update, account_update.nonce, account_update.balance 
		FROM account inner JOIN (
			SELECT idx, nonce, balance 
			FROM account_update
			WHERE idx = $1
			ORDER BY item_id DESC LIMIT 1
		) AS account_update ON account_update.idx = account.idx 
		INNER JOIN token ON account.token_id = token.token_id
		WHERE account.idx = $1;`, idx)

	if err != nil {
		return nil, tracerr.Wrap(err)
	}

	return account, nil
}

// GetAccountsAPI returns a list of accounts from the DB and pagination info
func (hdb *HistoryDB) GetAccountsAPI(
	tokenIDs []common.TokenID, ethAddr *ethCommon.Address,
	bjj *babyjub.PublicKeyComp, fromItem, limit *uint, order string,
) ([]AccountAPI, uint64, error) {
	if ethAddr != nil && bjj != nil {
		return nil, 0, tracerr.Wrap(errors.New("ethAddr and bjj are incompatible"))
	}
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	var query string
	var args []interface{}
	queryStr := `SELECT account.item_id, hez_idx(account.idx, token.symbol) as idx, account.batch_num, 
	account.bjj, account.eth_addr, token.token_id, token.item_id AS token_item_id, token.eth_block_num AS token_block,
	token.eth_addr as token_eth_addr, token.name, token.symbol, token.decimals, token.usd, token.usd_update, 
	account_update.nonce, account_update.balance, COUNT(*) OVER() AS total_items
	FROM account inner JOIN (
		SELECT DISTINCT idx,
		first_value(nonce) over(partition by idx ORDER BY item_id DESC) as nonce,
		first_value(balance) over(partition by idx ORDER BY item_id DESC) as balance
		FROM account_update
	) AS account_update ON account_update.idx = account.idx INNER JOIN token ON account.token_id = token.token_id `
	// Apply filters
	nextIsAnd := false
	// ethAddr filter
	if ethAddr != nil {
		queryStr += "WHERE account.eth_addr = ? "
		nextIsAnd = true
		args = append(args, ethAddr)
	} else if bjj != nil { // bjj filter
		queryStr += "WHERE account.bjj = ? "
		nextIsAnd = true
		args = append(args, bjj)
	}
	// tokenID filter
	if len(tokenIDs) > 0 {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		queryStr += "account.token_id IN (?) "
		args = append(args, tokenIDs)
		nextIsAnd = true
	}
	if fromItem != nil {
		if nextIsAnd {
			queryStr += "AND "
		} else {
			queryStr += "WHERE "
		}
		if order == OrderAsc {
			queryStr += "account.item_id >= ? "
		} else {
			queryStr += "account.item_id <= ? "
		}
		args = append(args, fromItem)
	}
	// pagination
	queryStr += "ORDER BY account.item_id "
	if order == OrderAsc {
		queryStr += " ASC "
	} else {
		queryStr += " DESC "
	}
	queryStr += fmt.Sprintf("LIMIT %d;", *limit)
	query, argsQ, err := sqlx.In(queryStr, args...)
	if err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	query = hdb.dbRead.Rebind(query)

	accounts := []*AccountAPI{}
	if err := meddler.QueryAll(hdb.dbRead, &accounts, query, argsQ...); err != nil {
		return nil, 0, tracerr.Wrap(err)
	}
	if len(accounts) == 0 {
		return []AccountAPI{}, 0, nil
	}

	return db.SlicePtrsToSlice(accounts).([]AccountAPI),
		accounts[0].TotalItems - uint64(len(accounts)), nil
}

// GetMetricsAPI returns metrics
func (hdb *HistoryDB) GetMetricsAPI(lastBatchNum common.BatchNum) (*Metrics, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	metricsTotals := &MetricsTotals{}
	metrics := &Metrics{}
	err = meddler.QueryRow(
		hdb.dbRead, metricsTotals, `SELECT COUNT(tx.*) as total_txs,
		COALESCE (MIN(tx.batch_num), 0) as batch_num, COALESCE (MIN(block.timestamp), 
		NOW()) AS min_timestamp, COALESCE (MAX(block.timestamp), NOW()) AS max_timestamp
		FROM tx INNER JOIN block ON tx.eth_block_num = block.eth_block_num
		WHERE block.timestamp >= NOW() - INTERVAL '24 HOURS';`)
	if err != nil {
		return nil, tracerr.Wrap(err)
	}

	seconds := metricsTotals.MaxTimestamp.Sub(metricsTotals.MinTimestamp).Seconds()
	// Avoid dividing by 0
	if seconds == 0 {
		seconds++
	}

	metrics.TransactionsPerSecond = float64(metricsTotals.TotalTransactions) / seconds

	if (lastBatchNum - metricsTotals.FirstBatchNum) > 0 {
		metrics.TransactionsPerBatch = float64(metricsTotals.TotalTransactions) /
			float64(lastBatchNum-metricsTotals.FirstBatchNum+1)
	} else {
		metrics.TransactionsPerBatch = float64(0)
	}

	err = meddler.QueryRow(
		hdb.dbRead, metricsTotals, `SELECT COUNT(*) AS total_batches, 
		COALESCE (SUM(total_fees_usd), 0) AS total_fees FROM batch 
		WHERE batch_num > $1;`, metricsTotals.FirstBatchNum)
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	if metricsTotals.TotalBatches > 0 {
		metrics.BatchFrequency = seconds / float64(metricsTotals.TotalBatches)
	} else {
		metrics.BatchFrequency = 0
	}
	if metricsTotals.TotalTransactions > 0 {
		metrics.AvgTransactionFee = metricsTotals.TotalFeesUSD / float64(metricsTotals.TotalTransactions)
	} else {
		metrics.AvgTransactionFee = 0
	}
	err = meddler.QueryRow(
		hdb.dbRead, metrics,
		`SELECT COUNT(*) AS total_bjjs, COUNT(DISTINCT(bjj)) AS total_accounts FROM account;`)
	if err != nil {
		return nil, tracerr.Wrap(err)
	}

	return metrics, nil
}

// GetAvgTxFeeAPI returns average transaction fee of the last 1h
func (hdb *HistoryDB) GetAvgTxFeeAPI() (float64, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return 0, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	metricsTotals := &MetricsTotals{}
	err = meddler.QueryRow(
		hdb.dbRead, metricsTotals, `SELECT COUNT(tx.*) as total_txs, 
		COALESCE (MIN(tx.batch_num), 0) as batch_num 
		FROM tx INNER JOIN block ON tx.eth_block_num = block.eth_block_num
		WHERE block.timestamp >= NOW() - INTERVAL '1 HOURS';`)
	if err != nil {
		return 0, tracerr.Wrap(err)
	}
	err = meddler.QueryRow(
		hdb.dbRead, metricsTotals, `SELECT COUNT(*) AS total_batches, 
		COALESCE (SUM(total_fees_usd), 0) AS total_fees FROM batch 
		WHERE batch_num > $1;`, metricsTotals.FirstBatchNum)
	if err != nil {
		return 0, tracerr.Wrap(err)
	}

	var avgTransactionFee float64
	if metricsTotals.TotalTransactions > 0 {
		avgTransactionFee = metricsTotals.TotalFeesUSD / float64(metricsTotals.TotalTransactions)
	} else {
		avgTransactionFee = 0
	}

	return avgTransactionFee, nil
}

// GetCommonAccountAPI returns the account associated to an account idx
func (hdb *HistoryDB) GetCommonAccountAPI(idx common.Idx) (*common.Account, error) {
	cancel, err := hdb.apiConnCon.Acquire()
	defer cancel()
	if err != nil {
		return nil, tracerr.Wrap(err)
	}
	defer hdb.apiConnCon.Release()
	account := &common.Account{}
	err = meddler.QueryRow(
		hdb.dbRead, account, `SELECT * FROM account WHERE idx = $1;`, idx,
	)
	return account, tracerr.Wrap(err)
}