package main

import (
	"context"
	"database/sql"
	"fmt"
	"math/rand"
	"time"

	_ "github.com/mattn/go-sqlite3" // Blank import to register the sqlite3 driver

	"github.com/status-im/go-waku/waku/persistence"
	"github.com/status-im/go-waku/waku/v2/protocol"
	"github.com/status-im/go-waku/waku/v2/protocol/pb"
)

const secondsMonth = int64(30 * time.Hour * 24)

func genRandomBytes(size int) (blk []byte, err error) {
	blk = make([]byte, size)
	_, err = rand.Read(blk)
	return
}

func genRandomTimestamp(t30daysAgo int64) int64 {
	return rand.Int63n(secondsMonth) + t30daysAgo
}

func genRandomContentTopic(n int) string {
	topics := []string{"topic1", "topic2", "topic3", "topic4", "topic5"}
	i := n % 5
	return protocol.NewContentTopic("test", 1, topics[i], "plaintext").String()
}

func newdb(path string) (*sql.DB, error) {
	db, err := sql.Open("sqlite3", path)
	if err != nil {
		return nil, err
	}
	return db, nil
}

func createTable(db *sql.DB) error {
	sqlStmt := `
	PRAGMA journal_mode=WAL;
	
	CREATE TABLE IF NOT EXISTS message (
		id BLOB,
		receiverTimestamp INTEGER NOT NULL,
		senderTimestamp INTEGER NOT NULL,
		contentTopic BLOB NOT NULL,
		pubsubTopic BLOB NOT NULL,
		payload BLOB,
		version INTEGER NOT NULL DEFAULT 0,
		CONSTRAINT messageIndex PRIMARY KEY (id, pubsubTopic)
	) WITHOUT ROWID;
	
	CREATE INDEX IF NOT EXISTS message_senderTimestamp ON message(senderTimestamp);
	CREATE INDEX IF NOT EXISTS message_receiverTimestamp ON message(receiverTimestamp);
	`
	_, err := db.Exec(sqlStmt)
	if err != nil {
		return err
	}
	return nil
}

func main() {

	Ns := []int{10_000, 100_000, 1_000_000}

	for _, N := range Ns {
		dbName := fmt.Sprintf("store%d.db", N)
		fmt.Println("Inserting ", N, " records in ", dbName)

		db, err := newdb(dbName)
		if err != nil {
			panic(err)
		}
		defer db.Close()

		query := "INSERT INTO message (id, receiverTimestamp, senderTimestamp, contentTopic, pubsubTopic, payload, version) VALUES (?, ?, ?, ?, ?, ?, ?)"

		err = createTable(db)
		if err != nil {
			panic(err)
		}

		trx, err := db.BeginTx(context.Background(), nil)
		if err != nil {
			panic(err)
		}

		stmt, err := trx.Prepare(query)
		if err != nil {
			panic(err)
		}

		t30daysAgo := time.Now().UnixNano() - secondsMonth
		pubsubTopic := protocol.DefaultPubsubTopic().String()
		for i := 1; i <= N; i++ {

			if i%1000 == 0 && i > 1 && i < N {
				err := trx.Commit()
				if err != nil {
					panic(err)
				}

				trx, err = db.BeginTx(context.Background(), nil)
				if err != nil {
					panic(err)
				}

				stmt, err = trx.Prepare(query)
				if err != nil {
					panic(err)
				}
			}

			if i%(N/10) == 0 && i > 1 {
				fmt.Println(i, "...")
			}

			randPayload, err := genRandomBytes(100)
			if err != nil {
				panic(err)
			}

			msg := pb.WakuMessage{
				Version:      0,
				ContentTopic: genRandomContentTopic(i),
				Timestamp:    genRandomTimestamp(t30daysAgo),
				Payload:      randPayload,
			}

			envelope := protocol.NewEnvelope(&msg, msg.Timestamp, pubsubTopic)
			dbKey := persistence.NewDBKey(uint64(msg.Timestamp), pubsubTopic, envelope.Index().Digest)

			_, err = stmt.Exec(dbKey.Bytes(), msg.Timestamp, msg.Timestamp, msg.ContentTopic, pubsubTopic, msg.Payload, msg.Version)
			if err != nil {
				panic(err)
			}
		}

		err = trx.Commit()
		if err != nil {
			panic(err)
		}
	}
}