// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// 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 ap

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/superseriousbusiness/activity/streams"
	"github.com/superseriousbusiness/activity/streams/vocab"
)

// ResolveStatusable tries to resolve the given bytes into an ActivityPub Statusable representation.
// It will then perform normalization on the Statusable by calling NormalizeStatusable, so that
// callers don't need to bother doing extra steps.
//
// Works for: Article, Document, Image, Video, Note, Page, Event, Place, Profile
func ResolveStatusable(ctx context.Context, b []byte) (Statusable, error) {
	rawStatusable := make(map[string]interface{})
	if err := json.Unmarshal(b, &rawStatusable); err != nil {
		return nil, fmt.Errorf("ResolveStatusable: error unmarshalling bytes into json: %w", err)
	}

	t, err := streams.ToType(ctx, rawStatusable)
	if err != nil {
		return nil, fmt.Errorf("ResolveStatusable: error resolving json into ap vocab type: %w", err)
	}

	var (
		statusable Statusable
		ok         bool
	)

	switch t.GetTypeName() {
	case ObjectArticle:
		statusable, ok = t.(vocab.ActivityStreamsArticle)
	case ObjectDocument:
		statusable, ok = t.(vocab.ActivityStreamsDocument)
	case ObjectImage:
		statusable, ok = t.(vocab.ActivityStreamsImage)
	case ObjectVideo:
		statusable, ok = t.(vocab.ActivityStreamsVideo)
	case ObjectNote:
		statusable, ok = t.(vocab.ActivityStreamsNote)
	case ObjectPage:
		statusable, ok = t.(vocab.ActivityStreamsPage)
	case ObjectEvent:
		statusable, ok = t.(vocab.ActivityStreamsEvent)
	case ObjectPlace:
		statusable, ok = t.(vocab.ActivityStreamsPlace)
	case ObjectProfile:
		statusable, ok = t.(vocab.ActivityStreamsProfile)
	}

	if !ok {
		err = fmt.Errorf("ResolveStatusable: could not resolve %T to Statusable", t)
		return nil, newErrWrongType(err)
	}

	NormalizeStatusableContent(statusable, rawStatusable)
	return statusable, nil
}

// ResolveStatusable tries to resolve the given bytes into an ActivityPub Accountable representation.
//
// Works for: Application, Group, Organization, Person, Service
func ResolveAccountable(ctx context.Context, b []byte) (Accountable, error) {
	rawAccountable := make(map[string]interface{})
	if err := json.Unmarshal(b, &rawAccountable); err != nil {
		return nil, fmt.Errorf("ResolveAccountable: error unmarshalling bytes into json: %w", err)
	}

	t, err := streams.ToType(ctx, rawAccountable)
	if err != nil {
		return nil, fmt.Errorf("ResolveAccountable: error resolving json into ap vocab type: %w", err)
	}

	var (
		accountable Accountable
		ok          bool
	)

	switch t.GetTypeName() {
	case ActorApplication:
		accountable, ok = t.(vocab.ActivityStreamsApplication)
	case ActorGroup:
		accountable, ok = t.(vocab.ActivityStreamsGroup)
	case ActorOrganization:
		accountable, ok = t.(vocab.ActivityStreamsOrganization)
	case ActorPerson:
		accountable, ok = t.(vocab.ActivityStreamsPerson)
	case ActorService:
		accountable, ok = t.(vocab.ActivityStreamsService)
	}

	if !ok {
		err = fmt.Errorf("ResolveAccountable: could not resolve %T to Accountable", t)
		return nil, newErrWrongType(err)
	}

	return accountable, nil
}