/*
   GoToSocial
   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Affero General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Affero General Public License for more details.

   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package account

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"mime/multipart"

	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
	"github.com/superseriousbusiness/gotosocial/internal/media"
	"github.com/superseriousbusiness/gotosocial/internal/text"
	"github.com/superseriousbusiness/gotosocial/internal/util"
)

func (p *processor) Update(ctx context.Context, account *gtsmodel.Account, form *apimodel.UpdateCredentialsRequest) (*apimodel.Account, error) {
	l := p.log.WithField("func", "AccountUpdate")

	if form.Discoverable != nil {
		if err := p.db.UpdateOneByID(ctx, account.ID, "discoverable", *form.Discoverable, &gtsmodel.Account{}); err != nil {
			return nil, fmt.Errorf("error updating discoverable: %s", err)
		}
	}

	if form.Bot != nil {
		if err := p.db.UpdateOneByID(ctx, account.ID, "bot", *form.Bot, &gtsmodel.Account{}); err != nil {
			return nil, fmt.Errorf("error updating bot: %s", err)
		}
	}

	if form.DisplayName != nil {
		if err := util.ValidateDisplayName(*form.DisplayName); err != nil {
			return nil, err
		}
		displayName := text.RemoveHTML(*form.DisplayName) // no html allowed in display name
		if err := p.db.UpdateOneByID(ctx, account.ID, "display_name", displayName, &gtsmodel.Account{}); err != nil {
			return nil, err
		}
	}

	if form.Note != nil {
		if err := util.ValidateNote(*form.Note); err != nil {
			return nil, err
		}
		note := text.SanitizeHTML(*form.Note) // html OK in note but sanitize it
		if err := p.db.UpdateOneByID(ctx, account.ID, "note", note, &gtsmodel.Account{}); err != nil {
			return nil, err
		}
	}

	if form.Avatar != nil && form.Avatar.Size != 0 {
		avatarInfo, err := p.UpdateAvatar(ctx, form.Avatar, account.ID)
		if err != nil {
			return nil, err
		}
		l.Tracef("new avatar info for account %s is %+v", account.ID, avatarInfo)
	}

	if form.Header != nil && form.Header.Size != 0 {
		headerInfo, err := p.UpdateHeader(ctx, form.Header, account.ID)
		if err != nil {
			return nil, err
		}
		l.Tracef("new header info for account %s is %+v", account.ID, headerInfo)
	}

	if form.Locked != nil {
		if err := p.db.UpdateOneByID(ctx, account.ID, "locked", *form.Locked, &gtsmodel.Account{}); err != nil {
			return nil, err
		}
	}

	if form.Source != nil {
		if form.Source.Language != nil {
			if err := util.ValidateLanguage(*form.Source.Language); err != nil {
				return nil, err
			}
			if err := p.db.UpdateOneByID(ctx, account.ID, "language", *form.Source.Language, &gtsmodel.Account{}); err != nil {
				return nil, err
			}
		}

		if form.Source.Sensitive != nil {
			if err := p.db.UpdateOneByID(ctx, account.ID, "locked", *form.Locked, &gtsmodel.Account{}); err != nil {
				return nil, err
			}
		}

		if form.Source.Privacy != nil {
			if err := util.ValidatePrivacy(*form.Source.Privacy); err != nil {
				return nil, err
			}
			if err := p.db.UpdateOneByID(ctx, account.ID, "privacy", *form.Source.Privacy, &gtsmodel.Account{}); err != nil {
				return nil, err
			}
		}
	}

	// fetch the account with all updated values set
	updatedAccount, err := p.db.GetAccountByID(ctx, account.ID)
	if err != nil {
		return nil, fmt.Errorf("could not fetch updated account %s: %s", account.ID, err)
	}

	p.fromClientAPI <- gtsmodel.FromClientAPI{
		APObjectType:   gtsmodel.ActivityStreamsProfile,
		APActivityType: gtsmodel.ActivityStreamsUpdate,
		GTSModel:       updatedAccount,
		OriginAccount:  updatedAccount,
	}

	acctSensitive, err := p.tc.AccountToMastoSensitive(ctx, updatedAccount)
	if err != nil {
		return nil, fmt.Errorf("could not convert account into mastosensitive account: %s", err)
	}
	return acctSensitive, nil
}

// UpdateAvatar does the dirty work of checking the avatar part of an account update form,
// parsing and checking the image, and doing the necessary updates in the database for this to become
// the account's new avatar image.
func (p *processor) UpdateAvatar(ctx context.Context, avatar *multipart.FileHeader, accountID string) (*gtsmodel.MediaAttachment, error) {
	var err error
	if int(avatar.Size) > p.config.MediaConfig.MaxImageSize {
		err = fmt.Errorf("avatar with size %d exceeded max image size of %d bytes", avatar.Size, p.config.MediaConfig.MaxImageSize)
		return nil, err
	}
	f, err := avatar.Open()
	if err != nil {
		return nil, fmt.Errorf("could not read provided avatar: %s", err)
	}

	// extract the bytes
	buf := new(bytes.Buffer)
	size, err := io.Copy(buf, f)
	if err != nil {
		return nil, fmt.Errorf("could not read provided avatar: %s", err)
	}
	if size == 0 {
		return nil, errors.New("could not read provided avatar: size 0 bytes")
	}

	// do the setting
	avatarInfo, err := p.mediaHandler.ProcessHeaderOrAvatar(ctx, buf.Bytes(), accountID, media.Avatar, "")
	if err != nil {
		return nil, fmt.Errorf("error processing avatar: %s", err)
	}

	return avatarInfo, f.Close()
}

// UpdateHeader does the dirty work of checking the header part of an account update form,
// parsing and checking the image, and doing the necessary updates in the database for this to become
// the account's new header image.
func (p *processor) UpdateHeader(ctx context.Context, header *multipart.FileHeader, accountID string) (*gtsmodel.MediaAttachment, error) {
	var err error
	if int(header.Size) > p.config.MediaConfig.MaxImageSize {
		err = fmt.Errorf("header with size %d exceeded max image size of %d bytes", header.Size, p.config.MediaConfig.MaxImageSize)
		return nil, err
	}
	f, err := header.Open()
	if err != nil {
		return nil, fmt.Errorf("could not read provided header: %s", err)
	}

	// extract the bytes
	buf := new(bytes.Buffer)
	size, err := io.Copy(buf, f)
	if err != nil {
		return nil, fmt.Errorf("could not read provided header: %s", err)
	}
	if size == 0 {
		return nil, errors.New("could not read provided header: size 0 bytes")
	}

	// do the setting
	headerInfo, err := p.mediaHandler.ProcessHeaderOrAvatar(ctx, buf.Bytes(), accountID, media.Header, "")
	if err != nil {
		return nil, fmt.Errorf("error processing header: %s", err)
	}

	return headerInfo, f.Close()
}