package projection

import (
	"context"

	"github.com/zitadel/zitadel/internal/errors"
	"github.com/zitadel/zitadel/internal/eventstore"
	"github.com/zitadel/zitadel/internal/eventstore/handler"
	"github.com/zitadel/zitadel/internal/eventstore/handler/crdb"
	"github.com/zitadel/zitadel/internal/repository/instance"
)

const (
	SMTPConfigProjectionTable = "projections.smtp_configs"

	SMTPConfigColumnAggregateID   = "aggregate_id"
	SMTPConfigColumnCreationDate  = "creation_date"
	SMTPConfigColumnChangeDate    = "change_date"
	SMTPConfigColumnSequence      = "sequence"
	SMTPConfigColumnResourceOwner = "resource_owner"
	SMTPConfigColumnInstanceID    = "instance_id"
	SMTPConfigColumnTLS           = "tls"
	SMTPConfigColumnSenderAddress = "sender_address"
	SMTPConfigColumnSenderName    = "sender_name"
	SMTPConfigColumnSMTPHost      = "host"
	SMTPConfigColumnSMTPUser      = "username"
	SMTPConfigColumnSMTPPassword  = "password"
)

type smtpConfigProjection struct {
	crdb.StatementHandler
}

func newSMTPConfigProjection(ctx context.Context, config crdb.StatementHandlerConfig) *smtpConfigProjection {
	p := new(smtpConfigProjection)
	config.ProjectionName = SMTPConfigProjectionTable
	config.Reducers = p.reducers()
	config.InitCheck = crdb.NewTableCheck(
		crdb.NewTable([]*crdb.Column{
			crdb.NewColumn(SMTPConfigColumnAggregateID, crdb.ColumnTypeText),
			crdb.NewColumn(SMTPConfigColumnCreationDate, crdb.ColumnTypeTimestamp),
			crdb.NewColumn(SMTPConfigColumnChangeDate, crdb.ColumnTypeTimestamp),
			crdb.NewColumn(SMTPConfigColumnSequence, crdb.ColumnTypeInt64),
			crdb.NewColumn(SMTPConfigColumnResourceOwner, crdb.ColumnTypeText),
			crdb.NewColumn(SMTPConfigColumnInstanceID, crdb.ColumnTypeText),
			crdb.NewColumn(SMTPConfigColumnTLS, crdb.ColumnTypeBool),
			crdb.NewColumn(SMTPConfigColumnSenderAddress, crdb.ColumnTypeText),
			crdb.NewColumn(SMTPConfigColumnSenderName, crdb.ColumnTypeText),
			crdb.NewColumn(SMTPConfigColumnSMTPHost, crdb.ColumnTypeText),
			crdb.NewColumn(SMTPConfigColumnSMTPUser, crdb.ColumnTypeText),
			crdb.NewColumn(SMTPConfigColumnSMTPPassword, crdb.ColumnTypeJSONB, crdb.Nullable()),
		},
			crdb.NewPrimaryKey(SMTPConfigColumnInstanceID, SMTPConfigColumnAggregateID),
		),
	)
	p.StatementHandler = crdb.NewStatementHandler(ctx, config)
	return p
}

func (p *smtpConfigProjection) reducers() []handler.AggregateReducer {
	return []handler.AggregateReducer{
		{
			Aggregate: instance.AggregateType,
			EventRedusers: []handler.EventReducer{
				{
					Event:  instance.SMTPConfigAddedEventType,
					Reduce: p.reduceSMTPConfigAdded,
				},
				{
					Event:  instance.SMTPConfigChangedEventType,
					Reduce: p.reduceSMTPConfigChanged,
				},
				{
					Event:  instance.SMTPConfigPasswordChangedEventType,
					Reduce: p.reduceSMTPConfigPasswordChanged,
				},
				{
					Event:  instance.SMTPConfigRemovedEventType,
					Reduce: p.reduceSMTPConfigRemoved,
				},
				{
					Event:  instance.InstanceRemovedEventType,
					Reduce: reduceInstanceRemovedHelper(SMTPConfigColumnInstanceID),
				},
			},
		},
	}
}

func (p *smtpConfigProjection) reduceSMTPConfigAdded(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.SMTPConfigAddedEvent)
	if !ok {
		return nil, errors.ThrowInvalidArgumentf(nil, "HANDL-sk99F", "reduce.wrong.event.type %s", instance.SMTPConfigAddedEventType)
	}
	return crdb.NewCreateStatement(
		e,
		[]handler.Column{
			handler.NewCol(SMTPConfigColumnAggregateID, e.Aggregate().ID),
			handler.NewCol(SMTPConfigColumnCreationDate, e.CreationDate()),
			handler.NewCol(SMTPConfigColumnChangeDate, e.CreationDate()),
			handler.NewCol(SMTPConfigColumnResourceOwner, e.Aggregate().ResourceOwner),
			handler.NewCol(SMTPConfigColumnInstanceID, e.Aggregate().InstanceID),
			handler.NewCol(SMTPConfigColumnSequence, e.Sequence()),
			handler.NewCol(SMTPConfigColumnTLS, e.TLS),
			handler.NewCol(SMTPConfigColumnSenderAddress, e.SenderAddress),
			handler.NewCol(SMTPConfigColumnSenderName, e.SenderName),
			handler.NewCol(SMTPConfigColumnSMTPHost, e.Host),
			handler.NewCol(SMTPConfigColumnSMTPUser, e.User),
			handler.NewCol(SMTPConfigColumnSMTPPassword, e.Password),
		},
	), nil
}

func (p *smtpConfigProjection) reduceSMTPConfigChanged(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.SMTPConfigChangedEvent)
	if !ok {
		return nil, errors.ThrowInvalidArgumentf(nil, "HANDL-wl0wd", "reduce.wrong.event.type %s", instance.SMTPConfigChangedEventType)
	}

	columns := make([]handler.Column, 0, 7)
	columns = append(columns, handler.NewCol(SMTPConfigColumnChangeDate, e.CreationDate()),
		handler.NewCol(SMTPConfigColumnSequence, e.Sequence()))
	if e.TLS != nil {
		columns = append(columns, handler.NewCol(SMTPConfigColumnTLS, *e.TLS))
	}
	if e.FromAddress != nil {
		columns = append(columns, handler.NewCol(SMTPConfigColumnSenderAddress, *e.FromAddress))
	}
	if e.FromName != nil {
		columns = append(columns, handler.NewCol(SMTPConfigColumnSenderName, *e.FromName))
	}
	if e.Host != nil {
		columns = append(columns, handler.NewCol(SMTPConfigColumnSMTPHost, *e.Host))
	}
	if e.User != nil {
		columns = append(columns, handler.NewCol(SMTPConfigColumnSMTPUser, *e.User))
	}
	return crdb.NewUpdateStatement(
		e,
		columns,
		[]handler.Condition{
			handler.NewCond(SMTPConfigColumnAggregateID, e.Aggregate().ID),
			handler.NewCond(SMTPConfigColumnInstanceID, e.Aggregate().InstanceID),
		},
	), nil
}

func (p *smtpConfigProjection) reduceSMTPConfigPasswordChanged(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.SMTPConfigPasswordChangedEvent)
	if !ok {
		return nil, errors.ThrowInvalidArgumentf(nil, "HANDL-fk02f", "reduce.wrong.event.type %s", instance.SMTPConfigChangedEventType)
	}

	return crdb.NewUpdateStatement(
		e,
		[]handler.Column{
			handler.NewCol(SMTPConfigColumnChangeDate, e.CreationDate()),
			handler.NewCol(SMTPConfigColumnSequence, e.Sequence()),
			handler.NewCol(SMTPConfigColumnSMTPPassword, e.Password),
		},
		[]handler.Condition{
			handler.NewCond(SMTPConfigColumnAggregateID, e.Aggregate().ID),
			handler.NewCond(SMTPConfigColumnInstanceID, e.Aggregate().InstanceID),
		},
	), nil
}

func (p *smtpConfigProjection) reduceSMTPConfigRemoved(event eventstore.Event) (*handler.Statement, error) {
	e, err := assertEvent[*instance.SMTPConfigRemovedEvent](event)
	if err != nil {
		return nil, err
	}
	return crdb.NewDeleteStatement(
		e,
		[]handler.Condition{
			handler.NewCond(SMTPConfigColumnAggregateID, e.Aggregate().ID),
			handler.NewCond(SMTPConfigColumnInstanceID, e.Aggregate().InstanceID),
		},
	), nil
}