package okit

import (
	"bufio"
	"strconv"
	"strings"
	"time"

	"github.com/golang/protobuf/jsonpb"
	"go.pitz.tech/okit/pb"
)

// Format defines an abstraction for writing entries to stdout/stderr. This is predominantly used in report log, trace,
// and event information from the process.
type Format interface {
	Marshal(writer *bufio.Writer, entry *pb.Entry) error
}

// JSONFormat writes entries using JSON encoded protocol buffers.
type JSONFormat struct {
	Marshaler jsonpb.Marshaler
}

func (f JSONFormat) Marshal(writer *bufio.Writer, entry *pb.Entry) error {
	f.Marshaler.Marshal(writer, entry)
	return writer.WriteByte('\n')
}

// TextFormat writes entries using a custom text format.
type TextFormat struct{}

func (f TextFormat) Marshal(writer *bufio.Writer, entry *pb.Entry) error {
	sink.WriteString(entry.Timestamp.AsTime().Format(time.RFC3339))
	sink.WriteByte('\t')
	sink.WriteString(strings.ToUpper(entry.Kind.String()))
	sink.WriteByte('\t')

	switch v := entry.GetValue().(type) {
	case *pb.Entry_String_:
		sink.WriteString(v.String_)
	case *pb.Entry_Double:
		sink.WriteString(strconv.FormatFloat(v.Double, 'f', 5, 64))
	case *pb.Entry_Duration:
		sink.WriteString(v.Duration.AsDuration().String())
	}
	sink.WriteByte('\t')
	sink.WriteString(entry.Scope)
	sink.WriteByte('\t')

	for _, tag := range entry.Tags {
		qs := tag.AsQueryString()
		if qs == "" {
			continue
		}

		sink.WriteString(qs)
		sink.WriteByte('&')
	}

	return sink.WriteByte('\n')
}