package pfile

import (
	"bytes"

	"git.crumpington.com/public/jldb/lib/wal"
	"git.crumpington.com/public/jldb/mdb/change"
)

// ----------------------------------------------------------------------------

type pFileState struct {
	Data map[[2]uint64][]byte
}

// ----------------------------------------------------------------------------

type recBuilder struct {
	changes []change.Change
	rec     wal.Record
}

func NewRecBuilder(seqNum, timestamp int64) *recBuilder {
	return &recBuilder{
		rec: wal.Record{
			SeqNum:      seqNum,
			TimestampMS: timestamp,
		},
		changes: []change.Change{},
	}
}

func (b *recBuilder) Store(cID, iID uint64, data string) *recBuilder {
	b.changes = append(b.changes, change.Change{
		CollectionID: cID,
		ItemID:       iID,
		Store:        true,
		Data:         []byte(data),
	})
	return b
}

func (b *recBuilder) Delete(cID, iID uint64) *recBuilder {
	b.changes = append(b.changes, change.Change{
		CollectionID: cID,
		ItemID:       iID,
		Store:        false,
	})
	return b
}

func (b *recBuilder) Record() wal.Record {
	buf := &bytes.Buffer{}
	change.Write(b.changes, buf)
	b.rec.DataSize = int64(buf.Len())
	b.rec.Reader = buf
	return b.rec
}