package starlog

import "b612.me/starlog/internal/multisinkx"

type SinkState string

const (
	SinkStateHealthy   SinkState = SinkState(multisinkx.StateHealthy)
	SinkStateDegraded  SinkState = SinkState(multisinkx.StateDegraded)
	SinkStateRecovered SinkState = SinkState(multisinkx.StateRecovered)
)

type SinkStats struct {
	Index                  int
	Writes                 uint64
	WriteErrors            uint64
	Closes                 uint64
	CloseErrors            uint64
	ConsecutiveWriteErrors uint64
	ConsecutiveCloseErrors uint64
	LastWriteError         string
	LastCloseError         string
	State                  SinkState
}

type MultiSinkStats struct {
	ContinueOnError bool
	Sinks           []SinkStats
}

type MultiSink struct {
	core *multisinkx.MultiSink
}

func wrapSinks(sinks []Sink) []multisinkx.Sink {
	if len(sinks) == 0 {
		return nil
	}
	result := make([]multisinkx.Sink, 0, len(sinks))
	for _, sink := range sinks {
		if sink == nil {
			continue
		}
		result = append(result, sink)
	}
	return result
}

func toSinkStats(stats multisinkx.Stats) SinkStats {
	return SinkStats{
		Index:                  stats.Index,
		Writes:                 stats.Writes,
		WriteErrors:            stats.WriteErrors,
		Closes:                 stats.Closes,
		CloseErrors:            stats.CloseErrors,
		ConsecutiveWriteErrors: stats.ConsecutiveWriteErrors,
		ConsecutiveCloseErrors: stats.ConsecutiveCloseErrors,
		LastWriteError:         stats.LastWriteError,
		LastCloseError:         stats.LastCloseError,
		State:                  SinkState(stats.State),
	}
}

func toMultiSinkStats(snapshot multisinkx.Snapshot) MultiSinkStats {
	result := MultiSinkStats{
		ContinueOnError: snapshot.ContinueOnError,
		Sinks:           make([]SinkStats, 0, len(snapshot.Sinks)),
	}
	for _, item := range snapshot.Sinks {
		result.Sinks = append(result.Sinks, toSinkStats(item))
	}
	return result
}

func NewMultiSink(sinks ...Sink) *MultiSink {
	return &MultiSink{
		core: multisinkx.New(wrapSinks(sinks)...),
	}
}

func (sink *MultiSink) SetSinks(sinks ...Sink) {
	if sink == nil || sink.core == nil {
		return
	}
	sink.core.SetSinks(wrapSinks(sinks)...)
}

func (sink *MultiSink) AddSink(item Sink) {
	if sink == nil || sink.core == nil || item == nil {
		return
	}
	sink.core.AddSink(item)
}

func (sink *MultiSink) SetContinueOnError(continueOnError bool) {
	if sink == nil || sink.core == nil {
		return
	}
	sink.core.SetContinueOnError(continueOnError)
}

func (sink *MultiSink) ContinueOnError() bool {
	if sink == nil || sink.core == nil {
		return true
	}
	return sink.core.ContinueOnError()
}

func (sink *MultiSink) SinkCount() int {
	if sink == nil || sink.core == nil {
		return 0
	}
	return sink.core.SinkCount()
}

func (sink *MultiSink) GetStats() MultiSinkStats {
	if sink == nil || sink.core == nil {
		return MultiSinkStats{
			ContinueOnError: true,
			Sinks:           nil,
		}
	}
	return toMultiSinkStats(sink.core.GetStats())
}

func (sink *MultiSink) ResetStats() {
	if sink == nil || sink.core == nil {
		return
	}
	sink.core.ResetStats()
}

func (sink *MultiSink) Write(data []byte) error {
	if sink == nil || sink.core == nil {
		return nil
	}
	return sink.core.Write(data)
}

func (sink *MultiSink) Close() error {
	if sink == nil || sink.core == nil {
		return nil
	}
	return sink.core.Close()
}