package command

import (
	"context"

	"github.com/zitadel/zitadel/internal/domain"
	caos_errs "github.com/zitadel/zitadel/internal/errors"
	"github.com/zitadel/zitadel/internal/eventstore"
	"github.com/zitadel/zitadel/internal/repository/user"
)

func (c *Commands) SetUserMetadata(ctx context.Context, metadata *domain.Metadata, userID, resourceOwner string) (_ *domain.Metadata, err error) {
	err = c.checkUserExists(ctx, userID, resourceOwner)
	if err != nil {
		return nil, err
	}
	setMetadata := NewUserMetadataWriteModel(userID, resourceOwner, metadata.Key)
	userAgg := UserAggregateFromWriteModel(&setMetadata.WriteModel)
	event, err := c.setUserMetadata(ctx, userAgg, metadata)
	if err != nil {
		return nil, err
	}
	pushedEvents, err := c.eventstore.Push(ctx, event)
	if err != nil {
		return nil, err
	}

	err = AppendAndReduce(setMetadata, pushedEvents...)
	if err != nil {
		return nil, err
	}
	return writeModelToUserMetadata(setMetadata), nil
}

func (c *Commands) BulkSetUserMetadata(ctx context.Context, userID, resourceOwner string, metadatas ...*domain.Metadata) (_ *domain.ObjectDetails, err error) {
	if len(metadatas) == 0 {
		return nil, caos_errs.ThrowPreconditionFailed(nil, "META-9mm2d", "Errors.Metadata.NoData")
	}
	err = c.checkUserExists(ctx, userID, resourceOwner)
	if err != nil {
		return nil, err
	}

	events := make([]eventstore.Command, len(metadatas))
	setMetadata := NewUserMetadataListWriteModel(userID, resourceOwner)
	userAgg := UserAggregateFromWriteModel(&setMetadata.WriteModel)
	for i, data := range metadatas {
		event, err := c.setUserMetadata(ctx, userAgg, data)
		if err != nil {
			return nil, err
		}
		events[i] = event
	}

	pushedEvents, err := c.eventstore.Push(ctx, events...)
	if err != nil {
		return nil, err
	}

	err = AppendAndReduce(setMetadata, pushedEvents...)
	if err != nil {
		return nil, err
	}
	return writeModelToObjectDetails(&setMetadata.WriteModel), nil
}

func (c *Commands) setUserMetadata(ctx context.Context, userAgg *eventstore.Aggregate, metadata *domain.Metadata) (command eventstore.Command, err error) {
	if !metadata.IsValid() {
		return nil, caos_errs.ThrowInvalidArgument(nil, "META-2m00f", "Errors.Metadata.Invalid")
	}
	return user.NewMetadataSetEvent(
		ctx,
		userAgg,
		metadata.Key,
		metadata.Value,
	), nil
}

func (c *Commands) RemoveUserMetadata(ctx context.Context, metadataKey, userID, resourceOwner string) (_ *domain.ObjectDetails, err error) {
	if metadataKey == "" {
		return nil, caos_errs.ThrowInvalidArgument(nil, "META-2n0fs", "Errors.Metadata.Invalid")
	}
	err = c.checkUserExists(ctx, userID, resourceOwner)
	if err != nil {
		return nil, err
	}
	removeMetadata, err := c.getUserMetadataModelByID(ctx, userID, resourceOwner, metadataKey)
	if err != nil {
		return nil, err
	}
	if !removeMetadata.State.Exists() {
		return nil, caos_errs.ThrowNotFound(nil, "META-ncnw3", "Errors.Metadata.NotFound")
	}
	userAgg := UserAggregateFromWriteModel(&removeMetadata.WriteModel)
	event, err := c.removeUserMetadata(ctx, userAgg, metadataKey)
	if err != nil {
		return nil, err
	}
	pushedEvents, err := c.eventstore.Push(ctx, event)
	if err != nil {
		return nil, err
	}

	err = AppendAndReduce(removeMetadata, pushedEvents...)
	if err != nil {
		return nil, err
	}
	return writeModelToObjectDetails(&removeMetadata.WriteModel), nil
}

func (c *Commands) BulkRemoveUserMetadata(ctx context.Context, userID, resourceOwner string, metadataKeys ...string) (_ *domain.ObjectDetails, err error) {
	if len(metadataKeys) == 0 {
		return nil, caos_errs.ThrowPreconditionFailed(nil, "META-9mm2d", "Errors.Metadata.NoData")
	}
	err = c.checkUserExists(ctx, userID, resourceOwner)
	if err != nil {
		return nil, err
	}

	events := make([]eventstore.Command, len(metadataKeys))
	removeMetadata, err := c.getUserMetadataListModelByID(ctx, userID, resourceOwner)
	if err != nil {
		return nil, err
	}
	userAgg := UserAggregateFromWriteModel(&removeMetadata.WriteModel)
	for i, key := range metadataKeys {
		if key == "" {
			return nil, caos_errs.ThrowInvalidArgument(nil, "COMMAND-m29ds", "Errors.Metadata.Invalid")
		}
		if _, found := removeMetadata.metadataList[key]; !found {
			return nil, caos_errs.ThrowNotFound(nil, "META-2nnds", "Errors.Metadata.KeyNotExisting")
		}
		event, err := c.removeUserMetadata(ctx, userAgg, key)
		if err != nil {
			return nil, err
		}
		events[i] = event
	}

	pushedEvents, err := c.eventstore.Push(ctx, events...)
	if err != nil {
		return nil, err
	}

	err = AppendAndReduce(removeMetadata, pushedEvents...)
	if err != nil {
		return nil, err
	}
	return writeModelToObjectDetails(&removeMetadata.WriteModel), nil
}

func (c *Commands) removeUserMetadataFromOrg(ctx context.Context, resourceOwner string) ([]eventstore.Command, error) {
	existingUserMetadata, err := c.getUserMetadataByOrgListModelByID(ctx, resourceOwner)
	if err != nil {
		return nil, err
	}
	if len(existingUserMetadata.UserMetadata) == 0 {
		return nil, nil
	}
	events := make([]eventstore.Command, 0)
	for key, value := range existingUserMetadata.UserMetadata {
		if len(value) == 0 {
			continue
		}
		events = append(events, user.NewMetadataRemovedAllEvent(ctx, &user.NewAggregate(key, resourceOwner).Aggregate))
	}
	return events, nil
}

func (c *Commands) removeUserMetadata(ctx context.Context, userAgg *eventstore.Aggregate, metadataKey string) (command eventstore.Command, err error) {
	command = user.NewMetadataRemovedEvent(
		ctx,
		userAgg,
		metadataKey,
	)
	return command, nil
}

func (c *Commands) getUserMetadataModelByID(ctx context.Context, userID, resourceOwner, key string) (*UserMetadataWriteModel, error) {
	userMetadataWriteModel := NewUserMetadataWriteModel(userID, resourceOwner, key)
	err := c.eventstore.FilterToQueryReducer(ctx, userMetadataWriteModel)
	if err != nil {
		return nil, err
	}
	return userMetadataWriteModel, nil
}

func (c *Commands) getUserMetadataListModelByID(ctx context.Context, userID, resourceOwner string) (*UserMetadataListWriteModel, error) {
	userMetadataWriteModel := NewUserMetadataListWriteModel(userID, resourceOwner)
	err := c.eventstore.FilterToQueryReducer(ctx, userMetadataWriteModel)
	if err != nil {
		return nil, err
	}
	return userMetadataWriteModel, nil
}

func (c *Commands) getUserMetadataByOrgListModelByID(ctx context.Context, resourceOwner string) (*UserMetadataByOrgListWriteModel, error) {
	userMetadataWriteModel := NewUserMetadataByOrgListWriteModel(resourceOwner)
	err := c.eventstore.FilterToQueryReducer(ctx, userMetadataWriteModel)
	if err != nil {
		return nil, err
	}
	return userMetadataWriteModel, nil
}