var Redis = require('redis-fast-driver');

var r = new Redis({
	//host: '/tmp/redis.sock', //unix domain
	host: '127.0.0.1', //can be IP or hostname
	port: 6379,
	maxRetries: 10, //reconnect retries, default -1 (infinity)
	auth: '123', //optional password, if needed
	db: 5, //optional db selection
	autoConnect: true, //will connect after creation
	doNotSetClientName: false, //will set connection name (you can see current connections by running CLIENT LIST on the redis server)
	doNotRunQuitOnEnd: false, //when you call `end()`, driver attempts to send `QUIT` command to redis before actual end
	// If a connection failure occurs, this is the time to wait before initiating a reconnect
	reconnectTimeout: 1000,
	// Amount of time to wait for an initial connection to be successful before trying again
	connectTimeout: 5000,
});

//happens only once
r.on('ready', function(){
	console.log('redis ready');
});

//happens every time it connects
r.on('connect', function(){
	console.log('redis connected');
});

r.on('disconnect', function(){
	console.log('redis disconnected');
});

r.on('reconnecting', function(num){
	console.log('redis reconnecting with attempt #' + num);
});

r.on('error', function(e){
	console.log('redis error', e);
});

// called on an explicit end, or exhausted reconnections
r.on('end', function() {
	console.log('redis closed');
});

//rawCall function has 2 arguments,
//1 - an array which contain a redis command
//2 - an optional callback
//Redis command is case insesitive, e.g. you can specify HMGET as HMGET, hmget or HmGeT
//but keys and value are case sensitive, foo, Foo, FoO are not the same...
r.rawCall(['set', 'foo', 'bar'], function(err, resp){
	console.log('SET via rawCall command returns err: %s, resp: %s', err, resp);
});

r.rawCall(['ping'], function(e, resp){
	console.log('ping', e, resp);
});

// Also has built-in ES6 Promise support (at the cost of a performance hit)
r.rawCallAsync(['ping'])
.then((resp) => {
	console.log('ping', resp);
})
.catch((e) => {
	console.error(e);
});

//types are decoded exactly as redis returns them
//e.g. GET will return string
r.rawCall(['set', 'number', 123]);
r.rawCall(['get', 'number'], function(err, resp){
	//type of "resp" will be "string"
	//this is not related to driver this is normal redis behaviour...
	console.log('The value: "%s", number key becomes typeof %s', resp, typeof resp);
});

//but the INCR command on the same key will return a number
r.rawCall(['incr', 'number'], function(err, resp){
	//type of "resp" will be a "number"
	console.log('The value after INCR: "%s", number key becomes typeof %s', resp, typeof resp);
});
//"number" type will also be returned on INCRBY ZSCORE HLEN and on each other redis command which returns a number.

//ZRANGE will return an Array, same as redis.
r.rawCall(['zadd', 'sortedset', 1, 'a', 2, 'b', 3, 'c']);
r.rawCall(['zrange', 'sortedset', 0, -1], function(err, resp){
	//type of will be "number"
	console.log('JSON encoded value of zrange: %s', JSON.stringify(resp));
});

//SCAN, HSCAN, SSCAN and other *SCAN* commands will return an Array within Array, like this:
// [ 245, ['key1', 'key2', 'key3'] ]
// first entry (245) - cursor, second entry - Array of keys.
r.rawCall(['hscan', 'hset:1', 0], function(e, resp){
	console.log('hscan 0', e, resp);
});

r.rawCall(['hmset', 'hset:1', 'a', 1, 'b', 2, 'c', 3], function(e, resp){
	console.log('hmset', e, resp);
});

r.rawCall(['zadd', 'zset:1', 1, 'a', 2, 'b', 3, 'c', 4, 'd'], function(e, resp){
	console.log('zset', e, resp);
});

//HMGET and HGETALL also return an Array
r.rawCall(['hgetall', 'hset:1'], function(e, resp){
	console.log('HGETALL', e, resp);
});

r.rawCall(['zrange', 'zset:1', 0, -1], function(e, resp){
	console.log('ZRANGE', e, resp);
	//disconnect
	r.end();
});

// init pipeline mode
r.rawCall(['multi']);
	r.rawCall(['echo', 'hello world']);
	r.rawCall(['ping']);
	r.rawCall(['incr', 'qqq']);
	r.rawCall(['set', 'foo', 'bar']);
	r.rawCall(['get', 'foo']);
// execute all commands above once
r.rawCall(['exec'], function(e, resp){
	console.log('exec resp', resp);
	// exec resp [ 'hello world', 'PONG', 1, 'OK', 'bar' ]
});