package cmd

import (
	"fmt"
	"path"

	log "github.com/go-pkgz/lgr"
	bolt "go.etcd.io/bbolt"

	"github.com/go-pkgz/auth/v2/avatar"
)

// AvatarCommand set of flags and command for avatar migration
// it converts all avatars from src.type to dst.type.
// Note: it is possible to run migration for the same types (src = dst) in order to resize all avatars.
type AvatarCommand struct {
	AvatarSrc AvatarGroup `group:"src" namespace:"src"`
	AvatarDst AvatarGroup `group:"dst" namespace:"dst"`

	migrator AvatarMigrator
	CommonOpts
}

// AvatarMigrator defines interface for migration
type AvatarMigrator interface {
	Migrate(avatar.Store, avatar.Store) (int, error)
}

type avatarMigrator struct{}

// Migrate from one avatar store to another. Can be used to convert between stores
func (a avatarMigrator) Migrate(dst, src avatar.Store) (int, error) {
	return avatar.Migrate(dst, src)
}

// Execute runs  with AvatarCommand parameters, entry point for "avatar" command
func (ac *AvatarCommand) Execute(_ []string) error {
	log.Printf("[INFO] migrate avatars from %s to %s", ac.AvatarSrc.Type, ac.AvatarDst.Type)

	src, err := ac.makeAvatarStore(ac.AvatarSrc)
	if err != nil {
		return fmt.Errorf("can't make avatart store for %s: %w", ac.AvatarSrc.Type, err)
	}

	dst, err := ac.makeAvatarStore(ac.AvatarDst)
	if err != nil {
		return fmt.Errorf("can't make avatart store for %s: %w", ac.AvatarDst.Type, err)
	}

	if ac.migrator == nil {
		ac.migrator = avatarMigrator{}
	}

	count, err := ac.migrator.Migrate(dst, src)
	if err != nil {
		return err
	}

	if err = dst.Close(); err != nil {
		log.Printf("[WARN] failed to close dst store %s", ac.AvatarDst.Type)
	}
	if err = src.Close(); err != nil {
		log.Printf("[WARN] failed to close src store %s", ac.AvatarSrc.Type)
	}

	log.Printf("[INFO] completed, migrated avatars = %d", count)
	return nil
}

func (ac *AvatarCommand) makeAvatarStore(gr AvatarGroup) (avatar.Store, error) {
	log.Printf("[DEBUG] make avatar store, type=%s", gr.Type)
	switch gr.Type {
	case "fs":
		if err := makeDirs(gr.FS.Path); err != nil {
			return nil, fmt.Errorf("failed to create avatar store: %w", err)
		}
		return avatar.NewLocalFS(gr.FS.Path), nil
	case "bolt":
		if err := makeDirs(path.Dir(gr.Bolt.File)); err != nil {
			return nil, fmt.Errorf("failed to create avatar store: %w", err)
		}
		return avatar.NewBoltDB(gr.Bolt.File, bolt.Options{})
	}
	return nil, fmt.Errorf("unsupported avatar store type %s", gr.Type)
}