package promtail

import (
	
	
	
	
	
)

const (
	defaultSendBatchSize    = 5
	defaultSendBatchTimeout = 5 * time.Second
	exchangeQueueSize       = 1024
)

//
// Creates a Promtail client with a custom Streams exchanger
//	NOTE: options are applied before client start
//
func ( StreamsExchanger,  map[string]string,  ...clientOption) (Client, error) {
	if  == nil {
		return nil, errors.New("exchanger is nil, no operations could be performed")
	}

	 := &promtailClient{
		exchanger: ,
		queue:     make(chan packedLogEntry, exchangeQueueSize),

		errorHandler: func( error) {
			if  != nil {
				log.Printf("failed to perform logs exchange with Loki: %s", )
			}
		},

		sendBatchTimeout: defaultSendBatchTimeout,
		sendBatchSize:    defaultSendBatchSize,

		stopSignal:  make(chan struct{}),
		stopAwaiter: make(chan struct{}),
	}

	for  := range  {
		[]()
	}

	go .exchange(copyLabels())

	return , nil
}

func ( string,  map[string]string,  ...clientOption) (Client, error) {
	if !(strings.HasPrefix(, "http://") ||
		strings.HasPrefix(, "https://")) {
		 = "http://" + 
	}

	return NewClient(NewJSONv1Exchanger(), , ...)
}

func ( uint) clientOption {
	return func( *promtailClient) {
		.sendBatchSize = 
	}
}

func ( time.Duration) clientOption {
	return func( *promtailClient) {
		if  <= 0 {
			return
		}

		.sendBatchTimeout = 
	}
}

func ( func( error)) clientOption {
	return func( *promtailClient) {
		.errorHandler = 
	}
}

func (,  string) clientOption {
	return func( *promtailClient) {
		if ,  := .exchanger.(BasicAuthExchanger);  {
			.SetBasicAuth(, )
		}
	}
}

type clientOption func(c *promtailClient)

type packedLogEntry struct {
	level    Level
	labels   map[string]string
	logEntry *LogEntry
}

type promtailClient struct {
	errorHandler func(error)

	sendBatchSize    uint
	sendBatchTimeout time.Duration

	queue     chan packedLogEntry
	exchanger StreamsExchanger

	isStopped   bool
	stopSignal  chan struct{}
	stopAwaiter chan struct{}
	stopOnce    sync.Once
}

func ( *promtailClient) () (*PongResponse, error) {
	return .exchanger.Ping()
}

func ( *promtailClient) ( Level,  string,  ...interface{}) {
	.LogfWithLabels(, nil, , ...)
}

func ( *promtailClient) ( Level,  map[string]string,  string,  ...interface{}) {
	if .isStopped { // Escape from endless lock
		log.Println("promtail client is stopped, no log entries will be sent!")
		return
	}

	.queue <- packedLogEntry{
		labels: copyLabels(),
		level:  ,
		logEntry: &LogEntry{
			Timestamp: time.Now(),
			Format:    ,
			Args:      ,
		},
	}
}

func ( *promtailClient) ( string,  ...interface{}) {
	.Logf(Debug, , ...)
}

func ( *promtailClient) ( string,  ...interface{}) {
	.Logf(Info, , ...)
}

func ( *promtailClient) ( string,  ...interface{}) {
	.Logf(Warn, , ...)
}

func ( *promtailClient) ( string,  ...interface{}) {
	.Logf(Error, , ...)
}

func ( *promtailClient) ( string,  ...interface{}) {
	.Logf(Fatal, , ...)
}

func ( *promtailClient) ( string,  ...interface{}) {
	.Logf(Panic, , ...)
}

func ( *promtailClient) () {
	.stopOnce.Do(func() {
		.isStopped = true  // Deny new incoming logs
		close(.stopSignal) // Send stop signal
		<-.stopAwaiter     // Await for stop signal response
	})
}

func ( *promtailClient) ( map[string]string) {
	var (
		 error

		 packedLogEntry
		          = newBatch()
		     = time.NewTimer(.sendBatchTimeout)
	)

:
	for {

		select {

		// On new log message
		case  = <-.queue:
			{
				.add()

				if .countEntries() >= .sendBatchSize {
					 = .exchanger.Push(.getStreams())
					if  != nil {
						.errorHandler()
					}

					.reset()
					.Reset(.sendBatchTimeout)
				}
			}

		// On send timeout
		case <-.C:
			{
				if .countEntries() > 0 {
					 = .exchanger.Push(.getStreams())
					if  != nil {
						.errorHandler()
					}

					.reset()
				}

				.Reset(.sendBatchTimeout)
			}

		// On client stop
		case <-.stopSignal:
			{
				.Stop()
				if .countEntries() > 0 {
					 = .exchanger.Push(.getStreams())
					if  != nil {
						.errorHandler()
					}
				}

				.stopAwaiter <- struct{}{}
				break 
			}

		}
	}
}

type logStreamBatch struct {
	size             uint
	predefinedLabels map[string]string
	streams          []*LogStream
}

func newBatch( map[string]string) *logStreamBatch {
	 := &logStreamBatch{predefinedLabels: copyLabels()}
	.reset()
	return 
}

func ( *logStreamBatch) ( packedLogEntry) {
	.size += 1

	 := ._getLevelIndex(.level)

	// For both use cases (custom labels and unknown log level we would add entry in a separate stream)
	if len(.labels) > 0 ||  < 0 {
		 := newLeveledStream(.level, .predefinedLabels, .labels)
		.Entries = []*LogEntry{.logEntry}
		.streams = append(.streams, )
	} else {
		// Or add to a cached stream :)
		.streams[].Entries = append(.streams[].Entries,
			.logEntry)
	}
}

func ( *logStreamBatch) () {
	.size = 0
	.streams = make([]*LogStream, len(._getCachedLevels()))
	.streams[._getLevelIndex(Debug)] = newLeveledStream(Debug, .predefinedLabels)
	.streams[._getLevelIndex(Info)] = newLeveledStream(Info, .predefinedLabels)
	.streams[._getLevelIndex(Warn)] = newLeveledStream(Warn, .predefinedLabels)
	.streams[._getLevelIndex(Error)] = newLeveledStream(Error, .predefinedLabels)
	.streams[._getLevelIndex(Panic)] = newLeveledStream(Panic, .predefinedLabels)
	.streams[._getLevelIndex(Fatal)] = newLeveledStream(Fatal, .predefinedLabels)
}

func ( *logStreamBatch) () []*LogStream {
	return .streams
}

func ( *logStreamBatch) () uint {
	return .size
}

func ( *logStreamBatch) ( Level) int {
	switch  {
	case Debug:
		return 0
	case Info:
		return 1
	case Warn:
		return 2
	case Error:
		return 3
	case Panic:
		return 4
	case Fatal:
		return 5
	default:
		return -1
	}
}

func ( *logStreamBatch) () []Level {
	return []Level{Debug, Info, Warn, Error, Panic, Fatal}
}

func newLeveledStream( Level,  ...map[string]string) *LogStream {
	return &LogStream{
		Level: ,
		Labels: copyAndMergeLabels(append(
			,
			map[string]string{logLevelForcedLabel: .String()},
		)...),
	}
}