var debug = require("debug");

var debugLog = debug("btcexp:core");

var LRU = require("lru-cache");
var fs = require('fs');

var utils = require("../utils.js");
var config = require("../config.js");
var coins = require("../coins.js");
var redisCache = require("../redisCache.js");
var Decimal = require("decimal.js");
var md5 = require("md5");

// choose one of the below: RPC to a node, or mock data while testing
var rpcApi = require("./rpcApi.js");
//var rpcApi = require("./mockApi.js");


// this value should be incremented whenever data format changes, to avoid
// pulling old-format data from a persistent cache
var cacheKeyVersion = "v1";


const ONE_SEC = 1000;
const ONE_MIN = 60 * ONE_SEC;
const ONE_HR = 60 * ONE_MIN;
const ONE_DAY = 24 * ONE_HR;
const ONE_YR = 265 * ONE_DAY;



function createMemoryLruCache(cacheObj, onCacheEvent) {
	return {
		get:function(key) {
			return new Promise(function(resolve, reject) {
				onCacheEvent("memory", "try", key);

				var val = cacheObj.get(key);

				if (val != null) {
					onCacheEvent("memory", "hit", key);

				} else {
					onCacheEvent("memory", "miss", key);
				}

				resolve(cacheObj.get(key));
			});
		},
		set:function(key, obj, maxAge) { cacheObj.set(key, obj, maxAge); }
	}
}

function tryCache(cacheKey, cacheObjs, index, resolve, reject) {
	if (index == cacheObjs.length) {
		resolve(null);

		return;
	}

	cacheObjs[index].get(cacheKey).then(function(result) {
		if (result != null) {
			resolve(result);

		} else {
			tryCache(cacheKey, cacheObjs, index + 1, resolve, reject);
		}
	});
}

function createTieredCache(cacheObjs) {
	return {
		get:function(key) {
			return new Promise(function(resolve, reject) {
				tryCache(key, cacheObjs, 0, resolve, reject);
			});
		},
		set:function(key, obj, maxAge) {
			for (var i = 0; i < cacheObjs.length; i++) {
				cacheObjs[i].set(key, obj, maxAge);
			}
		}
	}
}




var miscCaches = [];
var blockCaches = [];
var txCaches = [];

if (!config.noInmemoryRpcCache) {
	global.cacheStats.memory = {
		try: 0,
		hit: 0,
		miss: 0
	};

	var onMemoryCacheEvent = function(cacheType, eventType, cacheKey) {
		global.cacheStats.memory[eventType]++;
		//debugLog(`cache.${cacheType}.${eventType}: ${cacheKey}`);
	}

	miscCaches.push(createMemoryLruCache(new LRU(2000), onMemoryCacheEvent));
	blockCaches.push(createMemoryLruCache(new LRU(2000), onMemoryCacheEvent));
	txCaches.push(createMemoryLruCache(new LRU(10000), onMemoryCacheEvent));
}

if (redisCache.active) {
	global.cacheStats.redis = {
		try: 0,
		hit: 0,
		miss: 0,
		error: 0
	};

	var onRedisCacheEvent = function(cacheType, eventType, cacheKey) {
		global.cacheStats.redis[eventType]++;
		//debugLog(`cache.${cacheType}.${eventType}: ${cacheKey}`);
	}

	// md5 of the active RPC credentials serves as part of the key; this enables
	// multiple instances of btc-rpc-explorer (eg mainnet + testnet) to share
	// a single redis instance peacefully
	var rpcHostPort = `${config.credentials.rpc.host}:${config.credentials.rpc.port}`;
	var rpcCredKeyComponent = md5(JSON.stringify(config.credentials.rpc)).substring(0, 8);
	
	var redisCacheObj = redisCache.createCache(`${cacheKeyVersion}-${rpcCredKeyComponent}`, onRedisCacheEvent);

	miscCaches.push(redisCacheObj);
	blockCaches.push(redisCacheObj);
	txCaches.push(redisCacheObj);
}

var miscCache = createTieredCache(miscCaches);
var blockCache = createTieredCache(blockCaches);
var txCache = createTieredCache(txCaches);




function getGenesisBlockHash() {
	return coins[config.coin].genesisBlockHashesByNetwork[global.activeBlockchain];
}

function getGenesisCoinbaseTransactionId() {
	return coins[config.coin].genesisCoinbaseTransactionIdsByNetwork[global.activeBlockchain];
}



function tryCacheThenRpcApi(cache, cacheKey, cacheMaxAge, rpcApiFunction, cacheConditionFunction) {
	//debugLog("tryCache: " + versionedCacheKey + ", " + cacheMaxAge);
	
	if (cacheConditionFunction == null) {
		cacheConditionFunction = function(obj) {
			return true;
		};
	}

	return new Promise(function(resolve, reject) {
		var cacheResult = null;

		var finallyFunc = function() {
			if (cacheResult != null) {
				resolve(cacheResult);

			} else {
				rpcApiFunction().then(function(rpcResult) {
					if (rpcResult != null && cacheConditionFunction(rpcResult)) {
						cache.set(cacheKey, rpcResult, cacheMaxAge);
					}

					resolve(rpcResult);

				}).catch(function(err) {
					reject(err);
				});
			}
		};

		cache.get(cacheKey).then(function(result) {
			cacheResult = result;

			finallyFunc();
			
		}).catch(function(err) {
			utils.logError("nds9fc2eg621tf3", err, {cacheKey:cacheKey});

			finallyFunc();
		});
	});
}

function shouldCacheTransaction(tx) {
	if (!tx.confirmations) {
		return false;
	}
	
	if (tx.confirmations < 1) {
		return false;
	}

	if (tx.vin != null && tx.vin.length > 9) {
		return false;
	}

	return true;
}



function getBlockchainInfo() {
	return tryCacheThenRpcApi(miscCache, "getBlockchainInfo", 10 * ONE_SEC, rpcApi.getBlockchainInfo);
}

function getNetworkInfo() {
	return tryCacheThenRpcApi(miscCache, "getNetworkInfo", 10 * ONE_SEC, rpcApi.getNetworkInfo);
}

function getNetTotals() {
	return tryCacheThenRpcApi(miscCache, "getNetTotals", 10 * ONE_SEC, rpcApi.getNetTotals);
}

function getMempoolInfo() {
	return tryCacheThenRpcApi(miscCache, "getMempoolInfo", ONE_SEC, rpcApi.getMempoolInfo);
}

function getMempoolTxids() {
	// no caching, that would be dumb
	return rpcApi.getMempoolTxids();
}

function getMiningInfo() {
	return tryCacheThenRpcApi(miscCache, "getMiningInfo", 30 * ONE_SEC, rpcApi.getMiningInfo);
}

function getUptimeSeconds() {
	return tryCacheThenRpcApi(miscCache, "getUptimeSeconds", ONE_SEC, rpcApi.getUptimeSeconds);
}

function getChainTxStats(blockCount) {
	return tryCacheThenRpcApi(miscCache, "getChainTxStats-" + blockCount, 20 * ONE_MIN, function() {
		return rpcApi.getChainTxStats(blockCount);
	});
}

function getNetworkHashrate(blockCount) {
	return tryCacheThenRpcApi(miscCache, "getNetworkHashrate-" + blockCount, 20 * ONE_MIN, function() {
		return rpcApi.getNetworkHashrate(blockCount);
	});
}

function getBlockStats(hash) {
	return tryCacheThenRpcApi(miscCache, "getBlockStats-" + hash, ONE_YR, function() {
		return rpcApi.getBlockStats(hash);
	});
}

function getBlockStatsByHeight(height) {
	return tryCacheThenRpcApi(miscCache, "getBlockStatsByHeight-" + height, ONE_YR, function() {
		return rpcApi.getBlockStatsByHeight(height);
	});
}

function getUtxoSetSummary() {
	return tryCacheThenRpcApi(miscCache, "getUtxoSetSummary", 15 * ONE_MIN, rpcApi.getUtxoSetSummary);
}

function getTxCountStats(dataPtCount, blockStart, blockEnd) {
	return new Promise(function(resolve, reject) {
		var dataPoints = dataPtCount;

		getBlockchainInfo().then(function(getblockchaininfo) {
			if (typeof blockStart === "string") {
				if (["genesis", "first", "zero"].includes(blockStart)) {
					blockStart = 0;
				}
			}

			if (typeof blockEnd === "string") {
				if (["latest", "tip", "newest"].includes(blockEnd)) {
					blockEnd = getblockchaininfo.blocks;
				}
			}

			if (blockStart > blockEnd) {
				reject(`Error 37rhw0e7ufdsgf: blockStart (${blockStart}) > blockEnd (${blockEnd})`);

				return;
			}

			if (blockStart < 0) {
				blockStart += getblockchaininfo.blocks;
			}

			if (blockEnd < 0) {
				blockEnd += getblockchaininfo.blocks;
			}

			var chainTxStatsIntervals = [];
			for (var i = 0; i < dataPoints; i++) {
				chainTxStatsIntervals.push(parseInt(Math.max(10, getblockchaininfo.blocks - blockStart - i * (blockEnd - blockStart) / (dataPoints - 1) - 1)));
			}

			var promises = [];
			for (var i = 0; i < chainTxStatsIntervals.length; i++) {
				promises.push(getChainTxStats(chainTxStatsIntervals[i]));
			}

			Promise.all(promises).then(function(results) {
				if (results[0].name == "RpcError" && results[0].code == -8) {
					// recently started node - no meaningful data to return
					resolve(null);

					return;
				}

				var txStats = {
					txCounts: [],
					txLabels: [],
					txRates: []
				};

				for (var i = results.length - 1; i >= 0; i--) {
					if (results[i].window_tx_count) {
						txStats.txCounts.push( {x:(getblockchaininfo.blocks - results[i].window_block_count), y: (results[i].txcount - results[i].window_tx_count)} );
						txStats.txRates.push( {x:(getblockchaininfo.blocks - results[i].window_block_count), y: (results[i].txrate)} );
						txStats.txLabels.push(i);
					}
				}
				
				resolve({txCountStats:txStats, getblockchaininfo:getblockchaininfo, totalTxCount:results[0].txcount});

			}).catch(function(err) {
				reject(err);
			});

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getSmartFeeEstimates(mode, confTargetBlockCounts) {
	return new Promise(function(resolve, reject) {
		var promises = [];
		for (var i = 0; i < confTargetBlockCounts.length; i++) {
			promises.push(getSmartFeeEstimate(mode, confTargetBlockCounts[i]));
		}

		Promise.all(promises).then(function(results) {
			resolve(results);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getSmartFeeEstimate(mode, confTargetBlockCount) {
	return tryCacheThenRpcApi(miscCache, "getSmartFeeEstimate-" + mode + "-" + confTargetBlockCount, 5 * ONE_MIN, function() {
		return rpcApi.getSmartFeeEstimate(mode, confTargetBlockCount);
	});
}

function getPeerSummary() {
	return new Promise(function(resolve, reject) {
		tryCacheThenRpcApi(miscCache, "getpeerinfo", ONE_SEC, rpcApi.getPeerInfo).then(function(getpeerinfo) {
			var result = {};
			result.getpeerinfo = getpeerinfo;

			var versionSummaryMap = {};
			for (var i = 0; i < getpeerinfo.length; i++) {
				var x = getpeerinfo[i];

				if (versionSummaryMap[x.subver] == null) {
					versionSummaryMap[x.subver] = 0;
				}

				versionSummaryMap[x.subver]++;
			}

			var versionSummary = [];
			for (var prop in versionSummaryMap) {
				if (versionSummaryMap.hasOwnProperty(prop)) {
					versionSummary.push([prop, versionSummaryMap[prop]]);
				}
			}

			versionSummary.sort(function(a, b) {
				if (b[1] > a[1]) {
					return 1;

				} else if (b[1] < a[1]) {
					return -1;

				} else {
					return a[0].localeCompare(b[0]);
				}
			});



			var servicesSummaryMap = {};
			for (var i = 0; i < getpeerinfo.length; i++) {
				var x = getpeerinfo[i];

				if (servicesSummaryMap[x.services] == null) {
					servicesSummaryMap[x.services] = 0;
				}

				servicesSummaryMap[x.services]++;
			}

			var servicesSummary = [];
			for (var prop in servicesSummaryMap) {
				if (servicesSummaryMap.hasOwnProperty(prop)) {
					servicesSummary.push([prop, servicesSummaryMap[prop]]);
				}
			}

			servicesSummary.sort(function(a, b) {
				if (b[1] > a[1]) {
					return 1;

				} else if (b[1] < a[1]) {
					return -1;

				} else {
					return a[0].localeCompare(b[0]);
				}
			});



			result.versionSummary = versionSummary;
			result.servicesSummary = servicesSummary;

			resolve(result);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getMempoolDetails(start, count) {
	return new Promise(function(resolve, reject) {
		tryCacheThenRpcApi(miscCache, "getMempoolTxids", ONE_SEC, rpcApi.getMempoolTxids).then(function(resultTxids) {
			var txids = [];

			for (var i = start; (i < resultTxids.length && i < (start + count)); i++) {
				txids.push(resultTxids[i]);
			}

			getRawTransactionsWithInputs(txids, config.site.txMaxInput).then(function(result) {
				resolve({ txCount:resultTxids.length, transactions:result.transactions, txInputsByTransaction:result.txInputsByTransaction });
			});

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getBlockByHeight(blockHeight) {
	return tryCacheThenRpcApi(blockCache, "getBlockByHeight-" + blockHeight, ONE_HR, function() {
		return rpcApi.getBlockByHeight(blockHeight);
	});
}

function getBlocksByHeight(blockHeights) {
	return new Promise(function(resolve, reject) {
		var promises = [];
		for (var i = 0; i < blockHeights.length; i++) {
			promises.push(getBlockByHeight(blockHeights[i]));
		}

		Promise.all(promises).then(function(results) {
			resolve(results);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getBlockHeaderByHeight(blockHeight) {
	return tryCacheThenRpcApi(blockCache, "getBlockHeaderByHeight-" + blockHeight, ONE_HR, function() {
		return rpcApi.getBlockHeaderByHeight(blockHeight);
	});
}

function getBlockHeadersByHeight(blockHeights) {
	return new Promise(function(resolve, reject) {
		var promises = [];
		for (var i = 0; i < blockHeights.length; i++) {
			promises.push(getBlockHeaderByHeight(blockHeights[i]));
		}

		Promise.all(promises).then(function(results) {
			resolve(results);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getBlocksStatsByHeight(blockHeights) {
	return new Promise(function(resolve, reject) {
		var promises = [];
		for (var i = 0; i < blockHeights.length; i++) {
			promises.push(getBlockStatsByHeight(blockHeights[i]));
		}

		Promise.all(promises).then(function(results) {
			resolve(results);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getBlockByHash(blockHash) {
	return tryCacheThenRpcApi(blockCache, "getBlockByHash-" + blockHash, ONE_HR, function() {
		return rpcApi.getBlockByHash(blockHash);
	});
}

function getBlocksByHash(blockHashes) {
	return new Promise(function(resolve, reject) {
		var promises = [];
		for (var i = 0; i < blockHashes.length; i++) {
			promises.push(getBlockByHash(blockHashes[i]));
		}

		Promise.all(promises).then(function(results) {
			var result = {};

			results.forEach(function(item) {
				result[item.hash] = item;
			});

			resolve(result);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getRawTransaction(txid) {
	var rpcApiFunction = function() {
		return rpcApi.getRawTransaction(txid);
	};

	return tryCacheThenRpcApi(txCache, "getRawTransaction-" + txid, ONE_HR, rpcApiFunction, shouldCacheTransaction);
}

/*
	This function pulls raw tx data and then summarizes the outputs. It's used in memory-constrained situations.
*/
function getSummarizedTransactionOutput(txid, voutIndex) {
	var rpcApiFunction = function() {
		return new Promise(function(resolve, reject) {
			rpcApi.getRawTransaction(txid).then(function(rawTx) {
				var vout = rawTx.vout[voutIndex];
				if (vout.scriptPubKey) {
					if (vout.scriptPubKey.asm) {
						delete vout.scriptPubKey.asm;
					}

					if (vout.scriptPubKey.hex) {
						delete vout.scriptPubKey.hex;
					}
				}

				vout.txid = txid;
				vout.utxoTime = rawTx.time;

				if (rawTx.vin.length == 1 && rawTx.vin[0].coinbase) {
					vout.coinbaseSpend = true;
				}

				resolve(vout);

			}).catch(function(err) {
				reject(err);
			});
		});
	};

	return tryCacheThenRpcApi(txCache, `txoSummary-${txid}-${voutIndex}`, ONE_HR, rpcApiFunction, function() { return true; });
}

function getTxUtxos(tx) {
	return new Promise(function(resolve, reject) {
		var promises = [];

		for (var i = 0; i < tx.vout.length; i++) {
			promises.push(getUtxo(tx.txid, i));
		}

		Promise.all(promises).then(function(results) {
			resolve(results);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getUtxo(txid, outputIndex) {
	return new Promise(function(resolve, reject) {
		tryCacheThenRpcApi(miscCache, "utxo-" + txid + "-" + outputIndex, ONE_HR, function() {
			return rpcApi.getUtxo(txid, outputIndex);

		}).then(function(result) {
			// to avoid cache misses, rpcApi.getUtxo returns "0" instead of null
			if (result == "0") {
				resolve(null);

				return;
			}

			resolve(result);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getMempoolTxDetails(txid, includeAncDec) {
	return tryCacheThenRpcApi(miscCache, "mempoolTxDetails-" + txid + "-" + includeAncDec, ONE_HR, function() {
		return rpcApi.getMempoolTxDetails(txid, includeAncDec);
	});
}

function getAddress(address) {
	return tryCacheThenRpcApi(miscCache, "getAddress-" + address, ONE_HR, function() {
		return rpcApi.getAddress(address);
	});
}

function getRawTransactions(txids) {
	return new Promise(function(resolve, reject) {
		var promises = [];
		for (var i = 0; i < txids.length; i++) {
			promises.push(getRawTransaction(txids[i]));
		}

		Promise.all(promises).then(function(results) {
			resolve(results);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function buildBlockAnalysisData(blockHeight, txids, txIndex, results, callback) {
	if (txIndex >= txids.length) {
		callback();

		return;
	}

	var txid = txids[txIndex];

	getRawTransactionsWithInputs([txid]).then(function(txData) {
		results.push(summarizeBlockAnalysisData(blockHeight, txData.transactions[0], txData.txInputsByTransaction[txid]));
		
		buildBlockAnalysisData(blockHeight, txids, txIndex + 1, results, callback);
	});
}

function summarizeBlockAnalysisData(blockHeight, tx, inputs) {
	var txSummary = {};

	txSummary.txid = tx.txid;
	txSummary.version = tx.version;
	txSummary.size = tx.size;

	if (tx.vsize) {
		txSummary.vsize = tx.vsize;
	}

	if (tx.weight) {
		txSummary.weight = tx.weight;
	}

	if (tx.vin[0].coinbase) {
		txSummary.coinbase = true;
	}

	txSummary.vin = [];
	txSummary.totalInput = new Decimal(0);

	if (txSummary.coinbase) {
		var subsidy = global.coinConfig.blockRewardFunction(blockHeight, global.activeBlockchain);

		txSummary.totalInput = txSummary.totalInput.plus(new Decimal(subsidy));

		txSummary.vin.push({
			coinbase: true,
			value: subsidy
		});

	} else {
		for (var i = 0; i < tx.vin.length; i++) {
			var vin = tx.vin[i];
			var inputVout = inputs[i];

			txSummary.totalInput = txSummary.totalInput.plus(new Decimal(inputVout.value));

			txSummary.vin.push({
				txid: tx.vin[i].txid,
				vout: tx.vin[i].vout,
				sequence: tx.vin[i].sequence,
				value: inputVout.value,
				type: inputVout.scriptPubKey.type,
				reqSigs: inputVout.scriptPubKey.reqSigs,
				addressCount: (inputVout.scriptPubKey.addresses ? inputVout.scriptPubKey.addresses.length : 0)
			});
		}
	}


	txSummary.vout = [];
	txSummary.totalOutput = new Decimal(0);

	for (var i = 0; i < tx.vout.length; i++) {
		txSummary.totalOutput = txSummary.totalOutput.plus(new Decimal(tx.vout[i].value));

		txSummary.vout.push({
			value: tx.vout[i].value,
			type: tx.vout[i].scriptPubKey.type,
			reqSigs: tx.vout[i].scriptPubKey.reqSigs,
			addressCount: tx.vout[i].scriptPubKey.addresses ? tx.vout[i].scriptPubKey.addresses.length : 0
		});
	}

	if (txSummary.coinbase) {
		txSummary.totalFee = new Decimal(0);
		
	} else {
		txSummary.totalFee = txSummary.totalInput.minus(txSummary.totalOutput);
	}

	return txSummary;
}

function getRawTransactionsWithInputs(txids, maxInputs=-1) {
	return new Promise(function(resolve, reject) {
		getRawTransactions(txids).then(function(transactions) {
			var maxInputsTracked = config.site.txMaxInput;
			
			if (maxInputs <= 0) {
				maxInputsTracked = 1000000;

			} else if (maxInputs > 0) {
				maxInputsTracked = maxInputs;
			}

			var vinIds = [];
			for (var i = 0; i < transactions.length; i++) {
				var transaction = transactions[i];

				if (transaction && transaction.vin) {
					for (var j = 0; j < Math.min(maxInputsTracked, transaction.vin.length); j++) {
						if (transaction.vin[j].txid) {
							vinIds.push({txid:transaction.vin[j].txid, voutIndex:transaction.vin[j].vout});
						}
					}
				}
			}

			var promises = [];

			for (var i = 0; i < vinIds.length; i++) {
				var vinId = vinIds[i];

				promises.push(getSummarizedTransactionOutput(vinId.txid, vinId.voutIndex));
			}

			Promise.all(promises).then(function(promiseResults) {
				var summarizedTxOutputs = {};
				for (var i = 0; i < promiseResults.length; i++) {
					var summarizedTxOutput = promiseResults[i];

					summarizedTxOutputs[`${summarizedTxOutput.txid}:${summarizedTxOutput.n}`] = summarizedTxOutput;
				}

				var txInputsByTransaction = {};

				transactions.forEach(function(tx) {
					txInputsByTransaction[tx.txid] = {};

					if (tx && tx.vin) {
						for (var i = 0; i < Math.min(maxInputsTracked, tx.vin.length); i++) {
							var summarizedTxOutput = summarizedTxOutputs[`${tx.vin[i].txid}:${tx.vin[i].vout}`];
							if (summarizedTxOutput) {
								txInputsByTransaction[tx.txid][i] = summarizedTxOutput;
							}
						}
					}
				});

				resolve({ transactions:transactions, txInputsByTransaction:txInputsByTransaction });
			});
		}).catch(function(err) {
			reject(err);
		});
	});
}

function getBlockByHashWithTransactions(blockHash, txLimit, txOffset) {
	return new Promise(function(resolve, reject) {
		getBlockByHash(blockHash).then(function(block) {
			var txids = [];
			
			if (txOffset > 0) {
				txids.push(block.tx[0]);
			}

			for (var i = txOffset; i < Math.min(txOffset + txLimit, block.tx.length); i++) {
				txids.push(block.tx[i]);
			}

			getRawTransactionsWithInputs(txids, config.site.txMaxInput).then(function(txsResult) {
				if (txsResult.transactions && txsResult.transactions.length > 0) {
					block.coinbaseTx = txsResult.transactions[0];
					block.totalFees = utils.getBlockTotalFeesFromCoinbaseTxAndBlockHeight(block.coinbaseTx, block.height);
					block.miner = utils.getMinerFromCoinbaseTx(block.coinbaseTx);
				}

				// if we're on page 2, we don't really want the coinbase tx in the tx list anymore
				if (txOffset > 0) {
					txsResult.transactions.shift();
				}

				resolve({ getblock:block, transactions:txsResult.transactions, txInputsByTransaction:txsResult.txInputsByTransaction });
			});
		}).catch(function(err) {
			reject(err);
		});
	});
}

function getHelp() {
	return new Promise(function(resolve, reject) {
		tryCacheThenRpcApi(miscCache, "getHelp", ONE_DAY, rpcApi.getHelp).then(function(helpContent) {
			var lines = helpContent.split("\n");
			var sections = [];

			lines.forEach(function(line) {
				if (line.startsWith("==")) {
					var sectionName = line.substring(2);
					sectionName = sectionName.substring(0, sectionName.length - 2).trim();

					sections.push({name:sectionName, methods:[]});

				} else if (line.trim().length > 0) {
					var methodName = line.trim();

					if (methodName.includes(" ")) {
						methodName = methodName.substring(0, methodName.indexOf(" "));
					}

					sections[sections.length - 1].methods.push({name:methodName, content:line.trim()});
				}
			});

			resolve(sections);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function getRpcMethodHelp(methodName) {
	var rpcApiFunction = function() {
		return rpcApi.getRpcMethodHelp(methodName);
	};

	return new Promise(function(resolve, reject) {
		tryCacheThenRpcApi(miscCache, "getHelp-" + methodName, ONE_DAY, rpcApiFunction).then(function(helpContent) {
			var output = {};
			output.string = helpContent;

			var str = helpContent;

			var lines = str.split("\n");
			var argumentLines = [];
			var catchArgs = false;
			lines.forEach(function(line) {
				if (line.trim().length == 0) {
					catchArgs = false;
				}

				if (catchArgs) {
					argumentLines.push(line);
				}

				if (line.trim() == "Arguments:" || line.trim() == "Arguments") {
					catchArgs = true;
				}
			});

			var args = [];
			var argX = null;
			// looking for line starting with "N. " where N is an integer (1-2 digits)
			argumentLines.forEach(function(line) {
				var regex = /^([0-9]+)\.\s*"?(\w+)"?\s*\(([^,)]*),?\s*([^,)]*),?\s*([^,)]*),?\s*([^,)]*)?\s*\)\s*(.+)?$/;

				var match = regex.exec(line);

				if (match) {
					argX = {};
					argX.name = match[2];
					argX.detailsLines = [];

					argX.properties = [];

					if (match[3]) {
						argX.properties.push(match[3]);
					}

					if (match[4]) {
						argX.properties.push(match[4]);
					}

					if (match[5]) {
						argX.properties.push(match[5]);
					}

					if (match[6]) {
						argX.properties.push(match[6]);
					}

					if (match[7]) {
						argX.description = match[7];
					}

					args.push(argX);
				}

				if (!match && argX) {
					argX.detailsLines.push(line);
				}
			});

			output.args = args;

			resolve(output);

		}).catch(function(err) {
			reject(err);
		});
	});
}

function logCacheSizes() {
	var itemCounts = [ miscCache.itemCount, blockCache.itemCount, txCache.itemCount ];
	
	var stream = fs.createWriteStream("memoryUsage.csv", {flags:'a'});
	stream.write("itemCounts: " + JSON.stringify(itemCounts) + "\n");
	stream.end();
}

module.exports = {
	getGenesisBlockHash: getGenesisBlockHash,
	getGenesisCoinbaseTransactionId: getGenesisCoinbaseTransactionId,
	getBlockchainInfo: getBlockchainInfo,
	getNetworkInfo: getNetworkInfo,
	getNetTotals: getNetTotals,
	getMempoolInfo: getMempoolInfo,
	getMempoolTxids: getMempoolTxids,
	getMiningInfo: getMiningInfo,
	getBlockByHeight: getBlockByHeight,
	getBlocksByHeight: getBlocksByHeight,
	getBlockByHash: getBlockByHash,
	getBlocksByHash: getBlocksByHash,
	getBlockByHashWithTransactions: getBlockByHashWithTransactions,
	getRawTransaction: getRawTransaction,
	getRawTransactions: getRawTransactions,
	getRawTransactionsWithInputs: getRawTransactionsWithInputs,
	getTxUtxos: getTxUtxos,
	getMempoolTxDetails: getMempoolTxDetails,
	getUptimeSeconds: getUptimeSeconds,
	getHelp: getHelp,
	getRpcMethodHelp: getRpcMethodHelp,
	getAddress: getAddress,
	logCacheSizes: logCacheSizes,
	getPeerSummary: getPeerSummary,
	getChainTxStats: getChainTxStats,
	getMempoolDetails: getMempoolDetails,
	getTxCountStats: getTxCountStats,
	getSmartFeeEstimates: getSmartFeeEstimates,
	getSmartFeeEstimate: getSmartFeeEstimate,
	getUtxoSetSummary: getUtxoSetSummary,
	getNetworkHashrate: getNetworkHashrate,
	getBlockStats: getBlockStats,
	getBlockStatsByHeight: getBlockStatsByHeight,
	getBlocksStatsByHeight: getBlocksStatsByHeight,
	buildBlockAnalysisData: buildBlockAnalysisData,
	getBlockHeaderByHeight: getBlockHeaderByHeight,
	getBlockHeadersByHeight: getBlockHeadersByHeight
};