package main

import (
	"database/sql"
	_ "github.com/go-sql-driver/mysql"
	"time"
)

const (
	DATABASE_USER       = "root"
	DATABASE_PASS       = "pass"
	DATABASE_CONNECTION = "" //e.g. "tcp(localhost:55555)
	DATABASE_NAME       = "netflow"
	PROCESS_BATCH       = 3
)

type RawData struct {
	ipSrc      string
	ipDst      string
	time       time.Time
	port       int
	packetSize int
}

func derp() (err error) {
	db, err := sql.Open("mysql", DATABASE_USER+":"+DATABASE_PASS+"@/"+DATABASE_NAME)
	if err != nil {
		return
	}
	defer db.Close()

	rDat, err := fetchRawData(db)
	if err != nil {
		return
	}

	//Begin transaction
	tx, err := db.Begin()
	if err != nil {
		return
	}

	//TODO insertCleanedData

	//remove old data
	err = purgeRawData(tx, rDat)
	if err != nil {
		tx.Rollback()
		return
	}

	tx.Commit()
	return
}

func fetchRawData(db *sql.DB) (rDat []RawData, err error) {
	prepStmt, err := db.Prepare("SELECT * FROM raw_data LIMIT ? ")
	if err != nil {
		return
	}

	rows, err := prepStmt.Query(PROCESS_BATCH)
	if err != nil {
		return
	}

	for rows.Next() {
		var r RawData
		err = rows.Scan(&r.ipSrc, &r.ipDst, &r.time, &r.port, &r.packetSize)
		if err != nil {
			return
		}
		rDat = append(rDat, r)
	}
	return
}

func insertCleanedData(tx *sql.Tx, rDat []RawData) (err error) {

}

func purgeRawData(tx *sql.Tx, rDat []RawData) (err error) {
	for _, r := range rDat {
		prepStmt, err := tx.Prepare("DELETE FROM raw_data WHERE ip_src = ? AND ip_dst = ? AND time = ? AND port = ? AND packet_size = ?")
		if err != nil {
			return
		}
		_, err = prepStmt.Exec(r.ipSrc, r.ipDst, r.time, r.port, r.packetSize)
		if err != nil {
			return
		}
	}
	return
}

func insertCleanData(db *sql.DB, ipbSrc, ipbDst, volume string, time time.Time, port, occurences int) error {
	prepStmt, err := db.Prepare("INSERT INTO clean_data (ipb_src, ipb_dst, time, port, volume, occurenaces) VALUES ( ? , ? , ? , ? , ? , ? , ?) ON DUPLICATE KEY UPDATE occurences = occurences + ?")
	if err != nil {
		return err
	}

	_, err = prepStmt.Exec(ipbSrc, ipbDst, time, port, volume, occurences, occurences)
	if err != nil {
		return err
	}

	return nil
}

func insertASNIP(db *sql.DB, asn int, ipBlock string) error {
	prepCheck, err := db.Prepare("SELECT asn FROM asnip WHERE ip_block = ?")
	if err != nil {
		return err
	}
	defer prepCheck.Close()

	rows, err := prepCheck.Exec(ipBlock)
	if err != nil {
		return err
	}
	if rows != nil {
		return nil
	}

	prepIns, err := db.Prepare("INSERT INTO asnip VALUES ( ? , ? )")
	if err != nil {
		return err
	}
	defer prepIns.Close()

	_, err = prepIns.Exec(asn, ipBlock)
	if err != nil {
		return err
	}

	return nil
}

func removeASNIP(db *sql.DB, asn int, ipBlock string) error {
	prepStmt, err := db.Prepare("DELETE FROM anip WHERE asn = ? AND ip_block = ?")
	if err != nil {
		return err
	}
	defer prepStmt.Close()

	_, err = prepStmt.Exec(asn, ipBlock)
	if err != nil {
		return err
	}

	return nil
}