package main

import (
	"flag"
	"log"
	"time"

	"gitea.hashru.nl/dsprenkels/rushlink/internal/boltdb"
	"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
	bolt "go.etcd.io/bbolt"
	"gorm.io/gorm"
)

var (
	boltDBPath    = flag.String("boltdb", "", "location of the bolt database file")
	fileStorePath = flag.String("file-store", "", "path to the directory where uploaded files will be stored")
)

func main() {
	flag.Parse()

	boltFileStore, err := boltdb.OpenFileStore(*fileStorePath)
	if err != nil {
		log.Fatalln(err)
	}
	boltDB, err := boltdb.OpenDB(*boltDBPath, boltFileStore)
	if err != nil {
		log.Fatalln(err)
	}
	defer boltDB.Close()
	sqlDB, err := db.OpenDBFromEnvironment()
	if err != nil {
		log.Fatalln(err)
	}

	// Migrate database schema
	m := db.Gormigrate(sqlDB)
	if err := m.MigrateTo("202010251337"); err != nil {
		log.Fatalln(err)
	}

	// Migrate all files in filestorage
	if err := sqlDB.Transaction(func(sqlTx *gorm.DB) error {
		return boltDB.Bolt.View(func(boltTx *bolt.Tx) error {
			// Migrate all the file uploads
			allFUs, err := boltdb.AllFileUploads(boltTx)
			if err != nil {
				return err
			}
			var fusDeleted uint
			var sqlFUs []db.FileUpload
			for _, fu := range allFUs {
				isDeleted := fu.State == boltdb.FileUploadStateDeleted
				sqlFU := db.FileUpload{
					State:       db.FileUploadState(int(fu.State)),
					PubID:       fu.ID,
					FileName:    fu.FileName,
					ContentType: fu.ContentType,
					Checksum:    fu.Checksum,
					DeletedAt:   deletedAt(isDeleted),
				}
				sqlFUs = append(sqlFUs, sqlFU)
				if isDeleted {
					fusDeleted++
				}
			}
			log.Printf("migrating %v file uploads (of which %v deleted)", len(sqlFUs), fusDeleted)
			sqlTx.Create(sqlFUs)

			// Migrate all the pastes.
			allPastes, err := boltdb.AllPastes(boltTx)
			if err != nil {
				return err
			}
			var pastesDeleted uint
			var sqlPastes []db.Paste
			for _, paste := range allPastes {
				isDeleted := paste.State == boltdb.PasteStateDeleted
				sqlPaste := db.Paste{
					Type:        db.PasteType(int(paste.Type)),
					State:       db.PasteState(int(paste.State)),
					Content:     paste.Content,
					Key:         paste.Key,
					DeleteToken: paste.DeleteToken,
					CreatedAt:   paste.TimeCreated,
					DeletedAt:   deletedAt(isDeleted),
				}
				sqlPastes = append(sqlPastes, sqlPaste)
				if isDeleted {
					pastesDeleted++
				}
			}
			log.Printf("migrating %v pastes (of which %v deleted)", len(sqlPastes), pastesDeleted)
			sqlTx.Create(sqlPastes)

			return nil
		})
	}); err != nil {
		log.Fatalln(err)
	}

	log.Println("migration successful! :D")
}

func deletedAt(isDeleted bool) gorm.DeletedAt {
	if isDeleted {
		return gorm.DeletedAt{Time: time.Now(), Valid: true}
	}
	return gorm.DeletedAt{}
}