package eventsourcing

import (
	"context"
	"encoding/json"
	"strings"

	"github.com/caos/logging"
	"github.com/golang/protobuf/ptypes"

	"github.com/caos/zitadel/internal/cache/config"
	sd "github.com/caos/zitadel/internal/config/systemdefaults"
	"github.com/caos/zitadel/internal/crypto"
	"github.com/caos/zitadel/internal/errors"
	caos_errs "github.com/caos/zitadel/internal/errors"
	es_int "github.com/caos/zitadel/internal/eventstore"
	es_models "github.com/caos/zitadel/internal/eventstore/models"
	es_sdk "github.com/caos/zitadel/internal/eventstore/sdk"
	"github.com/caos/zitadel/internal/id"
	proj_model "github.com/caos/zitadel/internal/project/model"
	"github.com/caos/zitadel/internal/project/repository/eventsourcing/model"
)

const (
	projectOwnerRole       = "PROJECT_OWNER"
	projectOwnerGlobalRole = "PROJECT_OWNER_GLOBAL"
)

type ProjectEventstore struct {
	es_int.Eventstore
	projectCache  *ProjectCache
	passwordAlg   crypto.HashAlgorithm
	pwGenerator   crypto.Generator
	idGenerator   id.Generator
	ClientKeySize int
}

type ProjectConfig struct {
	es_int.Eventstore
	Cache *config.CacheConfig
}

func StartProject(conf ProjectConfig, systemDefaults sd.SystemDefaults) (*ProjectEventstore, error) {
	projectCache, err := StartCache(conf.Cache)
	if err != nil {
		return nil, err
	}
	passwordAlg := crypto.NewBCrypt(systemDefaults.SecretGenerators.PasswordSaltCost)
	pwGenerator := crypto.NewHashGenerator(systemDefaults.SecretGenerators.ClientSecretGenerator, passwordAlg)
	return &ProjectEventstore{
		Eventstore:    conf.Eventstore,
		projectCache:  projectCache,
		passwordAlg:   passwordAlg,
		pwGenerator:   pwGenerator,
		idGenerator:   id.SonyFlakeGenerator,
		ClientKeySize: int(systemDefaults.SecretGenerators.ApplicationKeySize),
	}, nil
}

func (es *ProjectEventstore) ProjectByID(ctx context.Context, id string) (*proj_model.Project, error) {
	project := es.projectCache.getProject(id)

	query, err := ProjectByIDQuery(project.AggregateID, project.Sequence)
	if err != nil {
		return nil, err
	}
	err = es_sdk.Filter(ctx, es.FilterEvents, project.AppendEvents, query)
	if err != nil && !(caos_errs.IsNotFound(err) && project.Sequence != 0) {
		return nil, err
	}
	if project.State == int32(proj_model.ProjectStateRemoved) {
		return nil, caos_errs.ThrowNotFound(nil, "EVENT-dG8ie", "Errors.Project.NotFound")
	}
	es.projectCache.cacheProject(project)
	return model.ProjectToModel(project), nil
}

func (es *ProjectEventstore) ProjectEventsByID(ctx context.Context, id string, sequence uint64) ([]*es_models.Event, error) {
	query, err := ProjectByIDQuery(id, sequence)
	if err != nil {
		return nil, err
	}
	return es.FilterEvents(ctx, query)
}

func (es *ProjectEventstore) ProjectChanges(ctx context.Context, id string, lastSequence uint64, limit uint64, sortAscending bool) (*proj_model.ProjectChanges, error) {
	query := ChangesQuery(id, lastSequence, limit, sortAscending)

	events, err := es.Eventstore.FilterEvents(context.Background(), query)
	if err != nil {
		logging.Log("EVENT-ZRffs").WithError(err).Warn("eventstore unavailable")
		return nil, errors.ThrowInternal(err, "EVENT-328b1", "Errors.Internal")
	}
	if len(events) == 0 {
		return nil, caos_errs.ThrowNotFound(nil, "EVENT-FpQqK", "Errors.Changes.NotFound")
	}

	changes := make([]*proj_model.ProjectChange, len(events))

	for i, event := range events {
		creationDate, err := ptypes.TimestampProto(event.CreationDate)
		logging.Log("EVENT-qxIR7").OnError(err).Debug("unable to parse timestamp")
		change := &proj_model.ProjectChange{
			ChangeDate: creationDate,
			EventType:  event.Type.String(),
			ModifierId: event.EditorUser,
			Sequence:   event.Sequence,
		}

		if event.Data != nil {
			var data interface{}
			if strings.Contains(change.EventType, "application") {
				data = new(model.Application)
			} else {
				data = new(model.Project)
			}
			err = json.Unmarshal(event.Data, data)
			logging.Log("EVENT-NCkpN").OnError(err).Debug("unable to unmarshal data")
			change.Data = data
		}

		changes[i] = change
		if lastSequence < event.Sequence {
			lastSequence = event.Sequence
		}
	}

	return &proj_model.ProjectChanges{
		Changes:      changes,
		LastSequence: lastSequence,
	}, nil
}

func ChangesQuery(projectID string, latestSequence, limit uint64, sortAscending bool) *es_models.SearchQuery {
	query := es_models.NewSearchQuery().
		AggregateTypeFilter(model.ProjectAggregate)
	if !sortAscending {
		query.OrderDesc()
	}

	query.LatestSequenceFilter(latestSequence).
		AggregateIDFilter(projectID).
		SetLimit(limit)
	return query
}

func (es *ProjectEventstore) ApplicationByIDs(ctx context.Context, projectID, appID string) (*proj_model.Application, error) {
	if projectID == "" || appID == "" {
		return nil, caos_errs.ThrowPreconditionFailed(nil, "EVENT-ld93d", "Errors.Project.IDMissing")
	}
	project, err := es.ProjectByID(ctx, projectID)
	if err != nil {
		return nil, err
	}

	if _, a := project.GetApp(appID); a != nil {
		return a, nil
	}
	return nil, caos_errs.ThrowNotFound(nil, "EVENT-8ei2s", "Errors.Project.App.NotFound")
}

func (es *ProjectEventstore) ApplicationChanges(ctx context.Context, projectID string, appID string, lastSequence uint64, limit uint64, sortAscending bool) (*proj_model.ApplicationChanges, error) {
	query := ChangesQuery(projectID, lastSequence, limit, sortAscending)

	events, err := es.Eventstore.FilterEvents(ctx, query)
	if err != nil {
		logging.Log("EVENT-ZRffs").WithError(err).Warn("eventstore unavailable")
		return nil, errors.ThrowInternal(err, "EVENT-sw6Ku", "Errors.Internal")
	}
	if len(events) == 0 {
		return nil, caos_errs.ThrowNotFound(nil, "EVENT-9IHLP", "Errors.Changes.NotFound")
	}

	result := make([]*proj_model.ApplicationChange, 0)
	for _, event := range events {
		if !strings.Contains(event.Type.String(), "application") || event.Data == nil {
			continue
		}

		app := new(model.Application)
		err := json.Unmarshal(event.Data, app)
		logging.Log("EVENT-GIiKD").OnError(err).Debug("unable to unmarshal data")
		if app.AppID != appID {
			continue
		}

		creationDate, err := ptypes.TimestampProto(event.CreationDate)
		logging.Log("EVENT-MJzeN").OnError(err).Debug("unable to parse timestamp")

		result = append(result, &proj_model.ApplicationChange{
			ChangeDate: creationDate,
			EventType:  event.Type.String(),
			ModifierId: event.EditorUser,
			Sequence:   event.Sequence,
			Data:       app,
		})
		if lastSequence < event.Sequence {
			lastSequence = event.Sequence
		}
	}

	return &proj_model.ApplicationChanges{
		Changes:      result,
		LastSequence: lastSequence,
	}, nil
}