"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
import { ForkEvent, Provider } from "@ethersproject/abstract-provider";
import { BigNumber } from "@ethersproject/bignumber";
import { arrayify, hexDataLength, hexlify, hexValue, isHexString } from "@ethersproject/bytes";
import { namehash } from "@ethersproject/hash";
import { getNetwork } from "@ethersproject/networks";
import { defineReadOnly, getStatic, resolveProperties } from "@ethersproject/properties";
import { toUtf8String } from "@ethersproject/strings";
import { poll } from "@ethersproject/web";
import { Logger } from "@ethersproject/logger";
import { version } from "./_version";
const logger = new Logger(version);
import { Formatter } from "./formatter";
//////////////////////////////
// Event Serializeing
function checkTopic(topic) {
    if (topic == null) {
        return "null";
    }
    if (hexDataLength(topic) !== 32) {
        logger.throwArgumentError("invalid topic", "topic", topic);
    }
    return topic.toLowerCase();
}
function serializeTopics(topics) {
    // Remove trailing null AND-topics; they are redundant
    topics = topics.slice();
    while (topics[topics.length - 1] == null) {
        topics.pop();
    }
    return topics.map((topic) => {
        if (Array.isArray(topic)) {
            // Only track unique OR-topics
            const unique = {};
            topic.forEach((topic) => {
                unique[checkTopic(topic)] = true;
            });
            // The order of OR-topics does not matter
            const sorted = Object.keys(unique);
            sorted.sort();
            return sorted.join("|");
        }
        else {
            return checkTopic(topic);
        }
    }).join("&");
}
function deserializeTopics(data) {
    return data.split(/&/g).map((topic) => {
        return topic.split("|").map((topic) => {
            return ((topic === "null") ? null : topic);
        });
    });
}
function getEventTag(eventName) {
    if (typeof (eventName) === "string") {
        eventName = eventName.toLowerCase();
        if (hexDataLength(eventName) === 32) {
            return "tx:" + eventName;
        }
        if (eventName.indexOf(":") === -1) {
            return eventName;
        }
    }
    else if (Array.isArray(eventName)) {
        return "filter:*:" + serializeTopics(eventName);
    }
    else if (ForkEvent.isForkEvent(eventName)) {
        logger.warn("not implemented");
        throw new Error("not implemented");
    }
    else if (eventName && typeof (eventName) === "object") {
        return "filter:" + (eventName.address || "*") + ":" + serializeTopics(eventName.topics || []);
    }
    throw new Error("invalid event - " + eventName);
}
//////////////////////////////
// Helper Object
function getTime() {
    return (new Date()).getTime();
}
//////////////////////////////
// Provider Object
/**
 *  EventType
 *   - "block"
 *   - "pending"
 *   - "error"
 *   - filter
 *   - topics array
 *   - transaction hash
 */
class Event {
    constructor(tag, listener, once) {
        defineReadOnly(this, "tag", tag);
        defineReadOnly(this, "listener", listener);
        defineReadOnly(this, "once", once);
    }
    pollable() {
        return (this.tag.indexOf(":") >= 0 || this.tag === "block" || this.tag === "pending");
    }
}
let defaultFormatter = null;
let nextPollId = 1;
export class BaseProvider extends Provider {
    constructor(network) {
        logger.checkNew(new.target, Provider);
        super();
        this.formatter = new.target.getFormatter();
        if (network instanceof Promise) {
            defineReadOnly(this, "ready", network.then((network) => {
                defineReadOnly(this, "_network", network);
                return network;
            }));
            // Squash any "unhandled promise" errors; that do not need to be handled
            this.ready.catch((error) => { });
        }
        else {
            const knownNetwork = getStatic((new.target), "getNetwork")(network);
            if (knownNetwork) {
                defineReadOnly(this, "_network", knownNetwork);
                defineReadOnly(this, "ready", Promise.resolve(this._network));
            }
            else {
                logger.throwArgumentError("invalid network", "network", network);
            }
        }
        this._maxInternalBlockNumber = -1024;
        this._lastBlockNumber = -2;
        // Events being listened to
        this._events = [];
        this._pollingInterval = 4000;
        this._emitted = { block: -2 };
        this._fastQueryDate = 0;
    }
    static getFormatter() {
        if (defaultFormatter == null) {
            defaultFormatter = new Formatter();
        }
        return defaultFormatter;
    }
    static getNetwork(network) {
        return getNetwork((network == null) ? "homestead" : network);
    }
    _getInternalBlockNumber(maxAge) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            const internalBlockNumber = this._internalBlockNumber;
            if (maxAge > 0 && this._internalBlockNumber) {
                const result = yield internalBlockNumber;
                if ((getTime() - result.respTime) <= maxAge) {
                    return result.blockNumber;
                }
            }
            const reqTime = getTime();
            this._internalBlockNumber = this.perform("getBlockNumber", {}).then((blockNumber) => {
                const respTime = getTime();
                blockNumber = BigNumber.from(blockNumber).toNumber();
                if (blockNumber < this._maxInternalBlockNumber) {
                    blockNumber = this._maxInternalBlockNumber;
                }
                this._maxInternalBlockNumber = blockNumber;
                this._setFastBlockNumber(blockNumber); // @TODO: Still need this?
                return { blockNumber, reqTime, respTime };
            });
            return (yield this._internalBlockNumber).blockNumber;
        });
    }
    poll() {
        return __awaiter(this, void 0, void 0, function* () {
            const pollId = nextPollId++;
            this.emit("willPoll", pollId);
            // Track all running promises, so we can trigger a post-poll once they are complete
            const runners = [];
            const blockNumber = yield this._getInternalBlockNumber(100 + this.pollingInterval / 2);
            this._setFastBlockNumber(blockNumber);
            // If the block has not changed, meh.
            if (blockNumber === this._lastBlockNumber) {
                return;
            }
            // First polling cycle, trigger a "block" events
            if (this._emitted.block === -2) {
                this._emitted.block = blockNumber - 1;
            }
            // Notify all listener for each block that has passed
            for (let i = this._emitted.block + 1; i <= blockNumber; i++) {
                this.emit("block", i);
            }
            // The emitted block was updated, check for obsolete events
            if (this._emitted.block !== blockNumber) {
                this._emitted.block = blockNumber;
                Object.keys(this._emitted).forEach((key) => {
                    // The block event does not expire
                    if (key === "block") {
                        return;
                    }
                    // The block we were at when we emitted this event
                    const eventBlockNumber = this._emitted[key];
                    // We cannot garbage collect pending transactions or blocks here
                    // They should be garbage collected by the Provider when setting
                    // "pending" events
                    if (eventBlockNumber === "pending") {
                        return;
                    }
                    // Evict any transaction hashes or block hashes over 12 blocks
                    // old, since they should not return null anyways
                    if (blockNumber - eventBlockNumber > 12) {
                        delete this._emitted[key];
                    }
                });
            }
            // First polling cycle
            if (this._lastBlockNumber === -2) {
                this._lastBlockNumber = blockNumber - 1;
            }
            // Find all transaction hashes we are waiting on
            this._events.forEach((event) => {
                const comps = event.tag.split(":");
                switch (comps[0]) {
                    case "tx": {
                        const hash = comps[1];
                        let runner = this.getTransactionReceipt(hash).then((receipt) => {
                            if (!receipt || receipt.blockNumber == null) {
                                return null;
                            }
                            this._emitted["t:" + hash] = receipt.blockNumber;
                            this.emit(hash, receipt);
                            return null;
                        }).catch((error) => { this.emit("error", error); });
                        runners.push(runner);
                        break;
                    }
                    case "filter": {
                        const topics = deserializeTopics(comps[2]);
                        const filter = {
                            address: comps[1],
                            fromBlock: this._lastBlockNumber + 1,
                            toBlock: blockNumber,
                            topics: topics
                        };
                        if (!filter.address) {
                            delete filter.address;
                        }
                        const runner = this.getLogs(filter).then((logs) => {
                            if (logs.length === 0) {
                                return;
                            }
                            logs.forEach((log) => {
                                this._emitted["b:" + log.blockHash] = log.blockNumber;
                                this._emitted["t:" + log.transactionHash] = log.blockNumber;
                                this.emit(filter, log);
                            });
                            return null;
                        }).catch((error) => { this.emit("error", error); });
                        runners.push(runner);
                        break;
                    }
                }
            });
            this._lastBlockNumber = blockNumber;
            Promise.all(runners).then(() => {
                this.emit("didPoll", pollId);
            });
            return null;
        });
    }
    resetEventsBlock(blockNumber) {
        this._lastBlockNumber = blockNumber - 1;
        if (this.polling) {
            this.poll();
        }
    }
    get network() {
        return this._network;
    }
    getNetwork() {
        return this.ready;
    }
    get blockNumber() {
        return this._fastBlockNumber;
    }
    get polling() {
        return (this._poller != null);
    }
    set polling(value) {
        setTimeout(() => {
            if (value && !this._poller) {
                this._poller = setInterval(this.poll.bind(this), this.pollingInterval);
                this.poll();
            }
            else if (!value && this._poller) {
                clearInterval(this._poller);
                this._poller = null;
            }
        }, 0);
    }
    get pollingInterval() {
        return this._pollingInterval;
    }
    set pollingInterval(value) {
        if (typeof (value) !== "number" || value <= 0 || parseInt(String(value)) != value) {
            throw new Error("invalid polling interval");
        }
        this._pollingInterval = value;
        if (this._poller) {
            clearInterval(this._poller);
            this._poller = setInterval(() => { this.poll(); }, this._pollingInterval);
        }
    }
    _getFastBlockNumber() {
        const now = getTime();
        // Stale block number, request a newer value
        if ((now - this._fastQueryDate) > 2 * this._pollingInterval) {
            this._fastQueryDate = now;
            this._fastBlockNumberPromise = this.getBlockNumber().then((blockNumber) => {
                if (this._fastBlockNumber == null || blockNumber > this._fastBlockNumber) {
                    this._fastBlockNumber = blockNumber;
                }
                return this._fastBlockNumber;
            });
        }
        return this._fastBlockNumberPromise;
    }
    _setFastBlockNumber(blockNumber) {
        // Older block, maybe a stale request
        if (this._fastBlockNumber != null && blockNumber < this._fastBlockNumber) {
            return;
        }
        // Update the time we updated the blocknumber
        this._fastQueryDate = getTime();
        // Newer block number, use  it
        if (this._fastBlockNumber == null || blockNumber > this._fastBlockNumber) {
            this._fastBlockNumber = blockNumber;
            this._fastBlockNumberPromise = Promise.resolve(blockNumber);
        }
    }
    // @TODO: Add .poller which must be an event emitter with a 'start', 'stop' and 'block' event;
    //        this will be used once we move to the WebSocket or other alternatives to polling
    waitForTransaction(transactionHash, confirmations, timeout) {
        return __awaiter(this, void 0, void 0, function* () {
            if (confirmations == null) {
                confirmations = 1;
            }
            const receipt = yield this.getTransactionReceipt(transactionHash);
            // Receipt is already good
            if ((receipt ? receipt.confirmations : 0) >= confirmations) {
                return receipt;
            }
            // Poll until the receipt is good...
            return new Promise((resolve, reject) => {
                let timer = null;
                let done = false;
                const handler = (receipt) => {
                    if (receipt.confirmations < confirmations) {
                        return;
                    }
                    if (timer) {
                        clearTimeout(timer);
                    }
                    if (done) {
                        return;
                    }
                    done = true;
                    this.removeListener(transactionHash, handler);
                    resolve(receipt);
                };
                this.on(transactionHash, handler);
                if (typeof (timeout) === "number" && timeout > 0) {
                    timer = setTimeout(() => {
                        if (done) {
                            return;
                        }
                        timer = null;
                        done = true;
                        this.removeListener(transactionHash, handler);
                        reject(logger.makeError("timeout exceeded", Logger.errors.TIMEOUT, { timeout: timeout }));
                    }, timeout);
                    if (timer.unref) {
                        timer.unref();
                    }
                }
            });
        });
    }
    getBlockNumber() {
        return this._getInternalBlockNumber(0);
    }
    getGasPrice() {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            return BigNumber.from(yield this.perform("getGasPrice", {}));
        });
    }
    getBalance(addressOrName, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            const params = yield resolveProperties({
                address: this._getAddress(addressOrName),
                blockTag: this._getBlockTag(blockTag)
            });
            return BigNumber.from(yield this.perform("getBalance", params));
        });
    }
    getTransactionCount(addressOrName, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            const params = yield resolveProperties({
                address: this._getAddress(addressOrName),
                blockTag: this._getBlockTag(blockTag)
            });
            return BigNumber.from(yield this.perform("getTransactionCount", params)).toNumber();
        });
    }
    getCode(addressOrName, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            const params = yield resolveProperties({
                address: this._getAddress(addressOrName),
                blockTag: this._getBlockTag(blockTag)
            });
            return hexlify(yield this.perform("getCode", params));
        });
    }
    getStorageAt(addressOrName, position, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            const params = yield resolveProperties({
                address: this._getAddress(addressOrName),
                blockTag: this._getBlockTag(blockTag),
                position: Promise.resolve(position).then((p) => hexValue(p))
            });
            return hexlify(yield this.perform("getStorageAt", params));
        });
    }
    // This should be called by any subclass wrapping a TransactionResponse
    _wrapTransaction(tx, hash) {
        if (hash != null && hexDataLength(hash) !== 32) {
            throw new Error("invalid response - sendTransaction");
        }
        const result = tx;
        // Check the hash we expect is the same as the hash the server reported
        if (hash != null && tx.hash !== hash) {
            logger.throwError("Transaction hash mismatch from Provider.sendTransaction.", Logger.errors.UNKNOWN_ERROR, { expectedHash: tx.hash, returnedHash: hash });
        }
        // @TODO: (confirmations? number, timeout? number)
        result.wait = (confirmations) => __awaiter(this, void 0, void 0, function* () {
            // We know this transaction *must* exist (whether it gets mined is
            // another story), so setting an emitted value forces us to
            // wait even if the node returns null for the receipt
            if (confirmations !== 0) {
                this._emitted["t:" + tx.hash] = "pending";
            }
            const receipt = yield this.waitForTransaction(tx.hash, confirmations);
            if (receipt == null && confirmations === 0) {
                return null;
            }
            // No longer pending, allow the polling loop to garbage collect this
            this._emitted["t:" + tx.hash] = receipt.blockNumber;
            if (receipt.status === 0) {
                logger.throwError("transaction failed", Logger.errors.CALL_EXCEPTION, {
                    transactionHash: tx.hash,
                    transaction: tx,
                    receipt: receipt
                });
            }
            return receipt;
        });
        return result;
    }
    sendTransaction(signedTransaction) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            const hexTx = yield Promise.resolve(signedTransaction).then(t => hexlify(t));
            const tx = this.formatter.transaction(signedTransaction);
            try {
                const hash = yield this.perform("sendTransaction", { signedTransaction: hexTx });
                return this._wrapTransaction(tx, hash);
            }
            catch (error) {
                error.transaction = tx;
                error.transactionHash = tx.hash;
                throw error;
            }
        });
    }
    _getTransactionRequest(transaction) {
        return __awaiter(this, void 0, void 0, function* () {
            const values = yield transaction;
            const tx = {};
            ["from", "to"].forEach((key) => {
                if (values[key] == null) {
                    return;
                }
                tx[key] = Promise.resolve(values[key]).then((v) => (v ? this._getAddress(v) : null));
            });
            ["gasLimit", "gasPrice", "value"].forEach((key) => {
                if (values[key] == null) {
                    return;
                }
                tx[key] = Promise.resolve(values[key]).then((v) => (v ? BigNumber.from(v) : null));
            });
            ["data"].forEach((key) => {
                if (values[key] == null) {
                    return;
                }
                tx[key] = Promise.resolve(values[key]).then((v) => (v ? hexlify(v) : null));
            });
            return this.formatter.transactionRequest(yield resolveProperties(tx));
        });
    }
    _getFilter(filter) {
        return __awaiter(this, void 0, void 0, function* () {
            if (filter instanceof Promise) {
                filter = yield filter;
            }
            const result = {};
            if (filter.address != null) {
                result.address = this._getAddress(filter.address);
            }
            ["blockHash", "topics"].forEach((key) => {
                if (filter[key] == null) {
                    return;
                }
                result[key] = filter[key];
            });
            ["fromBlock", "toBlock"].forEach((key) => {
                if (filter[key] == null) {
                    return;
                }
                result[key] = this._getBlockTag(filter[key]);
            });
            return this.formatter.filter(yield resolveProperties(filter));
        });
    }
    call(transaction, blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            const params = yield resolveProperties({
                transaction: this._getTransactionRequest(transaction),
                blockTag: this._getBlockTag(blockTag)
            });
            return hexlify(yield this.perform("call", params));
        });
    }
    estimateGas(transaction) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            const params = yield resolveProperties({
                transaction: this._getTransactionRequest(transaction)
            });
            return BigNumber.from(yield this.perform("estimateGas", params));
        });
    }
    _getAddress(addressOrName) {
        return __awaiter(this, void 0, void 0, function* () {
            const address = yield this.resolveName(addressOrName);
            if (address == null) {
                logger.throwError("ENS name not configured", Logger.errors.UNSUPPORTED_OPERATION, {
                    operation: `resolveName(${JSON.stringify(addressOrName)})`
                });
            }
            return address;
        });
    }
    _getBlock(blockHashOrBlockTag, includeTransactions) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            if (blockHashOrBlockTag instanceof Promise) {
                blockHashOrBlockTag = yield blockHashOrBlockTag;
            }
            // If blockTag is a number (not "latest", etc), this is the block number
            let blockNumber = -128;
            const params = {
                includeTransactions: !!includeTransactions
            };
            if (isHexString(blockHashOrBlockTag, 32)) {
                params.blockHash = blockHashOrBlockTag;
            }
            else {
                try {
                    params.blockTag = this.formatter.blockTag(yield this._getBlockTag(blockHashOrBlockTag));
                    if (isHexString(params.blockTag)) {
                        blockNumber = parseInt(params.blockTag.substring(2), 16);
                    }
                }
                catch (error) {
                    logger.throwArgumentError("invalid block hash or block tag", "blockHashOrBlockTag", blockHashOrBlockTag);
                }
            }
            return poll(() => __awaiter(this, void 0, void 0, function* () {
                const block = yield this.perform("getBlock", params);
                // Block was not found
                if (block == null) {
                    // For blockhashes, if we didn't say it existed, that blockhash may
                    // not exist. If we did see it though, perhaps from a log, we know
                    // it exists, and this node is just not caught up yet.
                    if (params.blockHash != null) {
                        if (this._emitted["b:" + params.blockHash] == null) {
                            return null;
                        }
                    }
                    // For block tags, if we are asking for a future block, we return null
                    if (params.blockTag != null) {
                        if (blockNumber > this._emitted.block) {
                            return null;
                        }
                    }
                    // Retry on the next block
                    return undefined;
                }
                // Add transactions
                if (includeTransactions) {
                    let blockNumber = null;
                    for (let i = 0; i < block.transactions.length; i++) {
                        const tx = block.transactions[i];
                        if (tx.blockNumber == null) {
                            tx.confirmations = 0;
                        }
                        else if (tx.confirmations == null) {
                            if (blockNumber == null) {
                                blockNumber = yield this._getInternalBlockNumber(100 + 2 * this.pollingInterval);
                            }
                            // Add the confirmations using the fast block number (pessimistic)
                            let confirmations = (blockNumber - tx.blockNumber) + 1;
                            if (confirmations <= 0) {
                                confirmations = 1;
                            }
                            tx.confirmations = confirmations;
                        }
                    }
                    return this.formatter.blockWithTransactions(block);
                }
                return this.formatter.block(block);
            }), { onceBlock: this });
        });
    }
    getBlock(blockHashOrBlockTag) {
        return (this._getBlock(blockHashOrBlockTag, false));
    }
    getBlockWithTransactions(blockHashOrBlockTag) {
        return (this._getBlock(blockHashOrBlockTag, true));
    }
    getTransaction(transactionHash) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            if (transactionHash instanceof Promise) {
                transactionHash = yield transactionHash;
            }
            const params = { transactionHash: this.formatter.hash(transactionHash, true) };
            return poll(() => __awaiter(this, void 0, void 0, function* () {
                const result = yield this.perform("getTransaction", params);
                if (result == null) {
                    if (this._emitted["t:" + transactionHash] == null) {
                        return null;
                    }
                    return undefined;
                }
                const tx = this.formatter.transactionResponse(result);
                if (tx.blockNumber == null) {
                    tx.confirmations = 0;
                }
                else if (tx.confirmations == null) {
                    const blockNumber = yield this._getInternalBlockNumber(100 + 2 * this.pollingInterval);
                    // Add the confirmations using the fast block number (pessimistic)
                    let confirmations = (blockNumber - tx.blockNumber) + 1;
                    if (confirmations <= 0) {
                        confirmations = 1;
                    }
                    tx.confirmations = confirmations;
                }
                return this._wrapTransaction(tx);
            }), { onceBlock: this });
        });
    }
    getTransactionReceipt(transactionHash) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            if (transactionHash instanceof Promise) {
                transactionHash = yield transactionHash;
            }
            const params = { transactionHash: this.formatter.hash(transactionHash, true) };
            return poll(() => __awaiter(this, void 0, void 0, function* () {
                const result = yield this.perform("getTransactionReceipt", params);
                if (result == null) {
                    if (this._emitted["t:" + transactionHash] == null) {
                        return null;
                    }
                    return undefined;
                }
                // "geth-etc" returns receipts before they are ready
                if (result.blockHash == null) {
                    return undefined;
                }
                const receipt = this.formatter.receipt(result);
                if (receipt.blockNumber == null) {
                    receipt.confirmations = 0;
                }
                else if (receipt.confirmations == null) {
                    const blockNumber = yield this._getInternalBlockNumber(100 + 2 * this.pollingInterval);
                    // Add the confirmations using the fast block number (pessimistic)
                    let confirmations = (blockNumber - receipt.blockNumber) + 1;
                    if (confirmations <= 0) {
                        confirmations = 1;
                    }
                    receipt.confirmations = confirmations;
                }
                return receipt;
            }), { onceBlock: this });
        });
    }
    getLogs(filter) {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            const params = yield resolveProperties({ filter: this._getFilter(filter) });
            const logs = yield this.perform("getLogs", params);
            logs.forEach((log) => {
                if (log.removed == null) {
                    log.removed = false;
                }
            });
            return Formatter.arrayOf(this.formatter.filterLog.bind(this.formatter))(logs);
        });
    }
    getEtherPrice() {
        return __awaiter(this, void 0, void 0, function* () {
            yield this.ready;
            return this.perform("getEtherPrice", {});
        });
    }
    _getBlockTag(blockTag) {
        return __awaiter(this, void 0, void 0, function* () {
            if (blockTag instanceof Promise) {
                blockTag = yield blockTag;
            }
            if (typeof (blockTag) === "number" && blockTag < 0) {
                if (blockTag % 1) {
                    logger.throwArgumentError("invalid BlockTag", "blockTag", blockTag);
                }
                let blockNumber = yield this._getInternalBlockNumber(100 + 2 * this.pollingInterval);
                blockNumber += blockTag;
                if (blockNumber < 0) {
                    blockNumber = 0;
                }
                return this.formatter.blockTag(blockNumber);
            }
            return this.formatter.blockTag(blockTag);
        });
    }
    _getResolver(name) {
        return __awaiter(this, void 0, void 0, function* () {
            // Get the resolver from the blockchain
            const network = yield this.getNetwork();
            // No ENS...
            if (!network.ensAddress) {
                logger.throwError("network does not support ENS", Logger.errors.UNSUPPORTED_OPERATION, { operation: "ENS", network: network.name });
            }
            // keccak256("resolver(bytes32)")
            const transaction = {
                to: network.ensAddress,
                data: ("0x0178b8bf" + namehash(name).substring(2))
            };
            return this.formatter.callAddress(yield this.call(transaction));
        });
    }
    resolveName(name) {
        return __awaiter(this, void 0, void 0, function* () {
            if (name instanceof Promise) {
                name = yield name;
            }
            // If it is already an address, nothing to resolve
            try {
                return Promise.resolve(this.formatter.address(name));
            }
            catch (error) {
                // If is is a hexstring, the address is bad (See #694)
                if (isHexString(name)) {
                    throw error;
                }
            }
            // Get the addr from the resovler
            const resolverAddress = yield this._getResolver(name);
            if (!resolverAddress) {
                return null;
            }
            // keccak256("addr(bytes32)")
            const transaction = {
                to: resolverAddress,
                data: ("0x3b3b57de" + namehash(name).substring(2))
            };
            return this.formatter.callAddress(yield this.call(transaction));
        });
    }
    lookupAddress(address) {
        return __awaiter(this, void 0, void 0, function* () {
            if (address instanceof Promise) {
                address = yield address;
            }
            address = this.formatter.address(address);
            const reverseName = address.substring(2).toLowerCase() + ".addr.reverse";
            const resolverAddress = yield this._getResolver(reverseName);
            if (!resolverAddress) {
                return null;
            }
            // keccak("name(bytes32)")
            let bytes = arrayify(yield this.call({
                to: resolverAddress,
                data: ("0x691f3431" + namehash(reverseName).substring(2))
            }));
            // Strip off the dynamic string pointer (0x20)
            if (bytes.length < 32 || !BigNumber.from(bytes.slice(0, 32)).eq(32)) {
                return null;
            }
            bytes = bytes.slice(32);
            // Not a length-prefixed string
            if (bytes.length < 32) {
                return null;
            }
            // Get the length of the string (from the length-prefix)
            const length = BigNumber.from(bytes.slice(0, 32)).toNumber();
            bytes = bytes.slice(32);
            // Length longer than available data
            if (length > bytes.length) {
                return null;
            }
            const name = toUtf8String(bytes.slice(0, length));
            // Make sure the reverse record matches the foward record
            const addr = yield this.resolveName(name);
            if (addr != address) {
                return null;
            }
            return name;
        });
    }
    perform(method, params) {
        return logger.throwError(method + " not implemented", Logger.errors.NOT_IMPLEMENTED, { operation: method });
    }
    _startPending() {
        console.log("WARNING: this provider does not support pending events");
    }
    _stopPending() {
    }
    // Returns true if there are events that still require polling
    _checkPolling() {
        this.polling = (this._events.filter((e) => e.pollable()).length > 0);
    }
    _addEventListener(eventName, listener, once) {
        this._events.push(new Event(getEventTag(eventName), listener, once));
        if (eventName === "pending") {
            this._startPending();
        }
        // Do we still now have any events that require polling?
        this._checkPolling();
        return this;
    }
    on(eventName, listener) {
        return this._addEventListener(eventName, listener, false);
    }
    once(eventName, listener) {
        return this._addEventListener(eventName, listener, true);
    }
    emit(eventName, ...args) {
        let result = false;
        let eventTag = getEventTag(eventName);
        this._events = this._events.filter((event) => {
            if (event.tag !== eventTag) {
                return true;
            }
            setTimeout(() => {
                event.listener.apply(this, args);
            }, 0);
            result = true;
            return !(event.once);
        });
        // Do we still have any events that require polling? ("once" events remove themselves)
        this._checkPolling();
        return result;
    }
    listenerCount(eventName) {
        if (!eventName) {
            return this._events.length;
        }
        let eventTag = getEventTag(eventName);
        return this._events.filter((event) => {
            return (event.tag === eventTag);
        }).length;
    }
    listeners(eventName) {
        if (eventName == null) {
            return this._events.map((event) => event.listener);
        }
        let eventTag = getEventTag(eventName);
        return this._events
            .filter((event) => (event.tag === eventTag))
            .map((event) => event.listener);
    }
    off(eventName, listener) {
        if (listener == null) {
            return this.removeAllListeners(eventName);
        }
        let found = false;
        let eventTag = getEventTag(eventName);
        this._events = this._events.filter((event) => {
            if (event.tag !== eventTag || event.listener != listener) {
                return true;
            }
            if (found) {
                return true;
            }
            found = true;
            return false;
        });
        if (eventName === "pending" && this.listenerCount("pending") === 0) {
            this._stopPending();
        }
        // Do we still have any events that require polling?
        this._checkPolling();
        return this;
    }
    removeAllListeners(eventName) {
        if (eventName == null) {
            this._events = [];
            this._stopPending();
        }
        else {
            let eventTag = getEventTag(eventName);
            this._events = this._events.filter((event) => {
                return (event.tag !== eventTag);
            });
            if (eventName === "pending") {
                this._stopPending();
            }
        }
        // Do we still have any events that require polling?
        this._checkPolling();
        return this;
    }
}