package projection

import (
	"context"

	"github.com/zitadel/zitadel/internal/eventstore"
	old_handler "github.com/zitadel/zitadel/internal/eventstore/handler"
	"github.com/zitadel/zitadel/internal/eventstore/handler/v2"
	"github.com/zitadel/zitadel/internal/repository/instance"
	"github.com/zitadel/zitadel/internal/repository/org"
	"github.com/zitadel/zitadel/internal/zerrors"
)

const (
	OrgMetadataProjectionTable = "projections.org_metadata2"

	OrgMetadataColumnOrgID         = "org_id"
	OrgMetadataColumnCreationDate  = "creation_date"
	OrgMetadataColumnChangeDate    = "change_date"
	OrgMetadataColumnSequence      = "sequence"
	OrgMetadataColumnResourceOwner = "resource_owner"
	OrgMetadataColumnInstanceID    = "instance_id"
	OrgMetadataColumnKey           = "key"
	OrgMetadataColumnValue         = "value"
	OrgMetadataColumnOwnerRemoved  = "owner_removed"
)

type orgMetadataProjection struct{}

func (*orgMetadataProjection) Name() string {
	return OrgMetadataProjectionTable
}

func (*orgMetadataProjection) Init() *old_handler.Check {
	return handler.NewTableCheck(
		handler.NewTable([]*handler.InitColumn{
			handler.NewColumn(OrgMetadataColumnOrgID, handler.ColumnTypeText),
			handler.NewColumn(OrgMetadataColumnCreationDate, handler.ColumnTypeTimestamp),
			handler.NewColumn(OrgMetadataColumnChangeDate, handler.ColumnTypeTimestamp),
			handler.NewColumn(OrgMetadataColumnSequence, handler.ColumnTypeInt64),
			handler.NewColumn(OrgMetadataColumnResourceOwner, handler.ColumnTypeText),
			handler.NewColumn(OrgMetadataColumnInstanceID, handler.ColumnTypeText),
			handler.NewColumn(OrgMetadataColumnKey, handler.ColumnTypeText),
			handler.NewColumn(OrgMetadataColumnValue, handler.ColumnTypeBytes, handler.Nullable()),
			handler.NewColumn(OrgMetadataColumnOwnerRemoved, handler.ColumnTypeBool, handler.Default(false)),
		},
			handler.NewPrimaryKey(OrgMetadataColumnInstanceID, OrgMetadataColumnOrgID, OrgMetadataColumnKey),
			handler.WithIndex(handler.NewIndex("owner_removed", []string{OrgMetadataColumnOwnerRemoved})),
		),
	)
}

func newOrgMetadataProjection(ctx context.Context, config handler.Config) *handler.Handler {
	return handler.NewHandler(ctx, &config, new(orgMetadataProjection))
}

func (p *orgMetadataProjection) Reducers() []handler.AggregateReducer {
	return []handler.AggregateReducer{
		{
			Aggregate: org.AggregateType,
			EventReducers: []handler.EventReducer{
				{
					Event:  org.MetadataSetType,
					Reduce: p.reduceMetadataSet,
				},
				{
					Event:  org.MetadataRemovedType,
					Reduce: p.reduceMetadataRemoved,
				},
				{
					Event:  org.MetadataRemovedAllType,
					Reduce: p.reduceMetadataRemovedAll,
				},
				{
					Event:  org.OrgRemovedEventType,
					Reduce: p.reduceOwnerRemoved,
				},
			},
		},
		{
			Aggregate: instance.AggregateType,
			EventReducers: []handler.EventReducer{
				{
					Event:  instance.InstanceRemovedEventType,
					Reduce: reduceInstanceRemovedHelper(OrgMetadataColumnInstanceID),
				},
			},
		},
	}
}

func (p *orgMetadataProjection) reduceMetadataSet(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*org.MetadataSetEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-Ghn53", "reduce.wrong.event.type %s", org.MetadataSetType)
	}
	return handler.NewUpsertStatement(
		e,
		[]handler.Column{
			handler.NewCol(OrgMetadataColumnInstanceID, nil),
			handler.NewCol(OrgMetadataColumnOrgID, nil),
			handler.NewCol(OrgMetadataColumnKey, e.Key),
		},
		[]handler.Column{
			handler.NewCol(OrgMetadataColumnInstanceID, e.Aggregate().InstanceID),
			handler.NewCol(OrgMetadataColumnOrgID, e.Aggregate().ID),
			handler.NewCol(OrgMetadataColumnKey, e.Key),
			handler.NewCol(OrgMetadataColumnResourceOwner, e.Aggregate().ResourceOwner),
			handler.NewCol(OrgMetadataColumnCreationDate, e.CreationDate()),
			handler.NewCol(OrgMetadataColumnChangeDate, e.CreationDate()),
			handler.NewCol(OrgMetadataColumnSequence, e.Sequence()),
			handler.NewCol(OrgMetadataColumnValue, e.Value),
		},
	), nil
}

func (p *orgMetadataProjection) reduceMetadataRemoved(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*org.MetadataRemovedEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-Bm542", "reduce.wrong.event.type %s", org.MetadataRemovedType)
	}
	return handler.NewDeleteStatement(
		e,
		[]handler.Condition{
			handler.NewCond(OrgMetadataColumnOrgID, e.Aggregate().ID),
			handler.NewCond(OrgMetadataColumnKey, e.Key),
			handler.NewCond(OrgMetadataColumnInstanceID, e.Aggregate().InstanceID),
		},
	), nil
}

func (p *orgMetadataProjection) reduceMetadataRemovedAll(event eventstore.Event) (*handler.Statement, error) {
	switch event.(type) {
	case *org.MetadataRemovedAllEvent,
		*org.OrgRemovedEvent:
		//ok
	default:
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-Bmnf3", "reduce.wrong.event.type %v", []eventstore.EventType{org.MetadataRemovedAllType, org.OrgRemovedEventType})
	}
	return handler.NewDeleteStatement(
		event,
		[]handler.Condition{
			handler.NewCond(OrgMetadataColumnOrgID, event.Aggregate().ID),
			handler.NewCond(OrgMetadataColumnInstanceID, event.Aggregate().InstanceID),
		},
	), nil
}

func (p *orgMetadataProjection) reduceOwnerRemoved(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*org.OrgRemovedEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "PROJE-Hkd1f", "reduce.wrong.event.type %s", org.OrgRemovedEventType)
	}

	return handler.NewUpdateStatement(
		e,
		[]handler.Column{
			handler.NewCol(OrgMetadataColumnChangeDate, e.CreationDate()),
			handler.NewCol(OrgMetadataColumnSequence, e.Sequence()),
			handler.NewCol(OrgMetadataColumnOwnerRemoved, true),
		},
		[]handler.Condition{
			handler.NewCond(OrgMetadataColumnInstanceID, e.Aggregate().InstanceID),
			handler.NewCond(OrgMetadataColumnResourceOwner, e.Aggregate().ID),
		},
	), nil
}