package projection

import (
	"context"

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

const InstanceRelationalProjectionTable = "zitadel.instances"

type instanceRelationalProjection struct{}

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

func (*instanceRelationalProjection) Name() string {
	return InstanceRelationalProjectionTable
}

func (p *instanceRelationalProjection) Reducers() []handler.AggregateReducer {
	return []handler.AggregateReducer{
		{
			Aggregate: instance.AggregateType,
			EventReducers: []handler.EventReducer{
				{
					Event:  instance.InstanceAddedEventType,
					Reduce: p.reduceInstanceAdded,
				},
				{
					Event:  instance.InstanceChangedEventType,
					Reduce: p.reduceInstanceChanged,
				},
				{
					Event:  instance.InstanceRemovedEventType,
					Reduce: p.reduceInstanceDelete,
				},
				{
					Event:  instance.DefaultOrgSetEventType,
					Reduce: p.reduceDefaultOrgSet,
				},
				{
					Event:  instance.ProjectSetEventType,
					Reduce: p.reduceIAMProjectSet,
				},
				{
					Event:  instance.ConsoleSetEventType,
					Reduce: p.reduceConsoleSet,
				},
				{
					Event:  instance.DefaultLanguageSetEventType,
					Reduce: p.reduceDefaultLanguageSet,
				},
			},
		},
	}
}

func (p *instanceRelationalProjection) reduceInstanceAdded(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.InstanceAddedEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-29nRr", "reduce.wrong.event.type %s", instance.InstanceAddedEventType)
	}
	return handler.NewCreateStatement(
		e,
		[]handler.Column{
			handler.NewCol(InstanceColumnID, e.Aggregate().InstanceID),
			handler.NewCol(InstanceColumnName, e.Name),
			handler.NewCol(CreatedAt, e.CreationDate()),
			handler.NewCol(UpdatedAt, e.CreationDate()),
		},
	), nil
}

func (p *instanceRelationalProjection) reduceInstanceChanged(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.InstanceChangedEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-so2am1", "reduce.wrong.event.type %s", instance.InstanceChangedEventType)
	}
	return handler.NewUpdateStatement(
		e,
		[]handler.Column{
			handler.NewCol(InstanceColumnName, e.Name),
			handler.NewCol(UpdatedAt, e.CreationDate()),
		},
		[]handler.Condition{
			handler.NewCond(InstanceColumnID, e.Aggregate().InstanceID),
		},
	), nil
}

func (p *instanceRelationalProjection) reduceInstanceDelete(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.InstanceRemovedEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-so2am1", "reduce.wrong.event.type %s", instance.InstanceChangedEventType)
	}
	return handler.NewDeleteStatement(
		e,
		[]handler.Condition{
			handler.NewCond(InstanceColumnID, e.Aggregate().InstanceID),
		},
	), nil
}

func (p *instanceRelationalProjection) reduceDefaultOrgSet(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.DefaultOrgSetEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-2n9f2", "reduce.wrong.event.type %s", instance.DefaultOrgSetEventType)
	}
	return handler.NewUpdateStatement(
		e,
		[]handler.Column{
			handler.NewCol(UpdatedAt, e.CreationDate()),
			handler.NewCol(InstanceColumnDefaultOrgID, e.OrgID),
		},
		[]handler.Condition{
			handler.NewCond(InstanceColumnID, e.Aggregate().InstanceID),
		},
	), nil
}

func (p *instanceRelationalProjection) reduceIAMProjectSet(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.ProjectSetEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-30o0e", "reduce.wrong.event.type %s", instance.ProjectSetEventType)
	}
	return handler.NewUpdateStatement(
		e,
		[]handler.Column{
			handler.NewCol(UpdatedAt, e.CreationDate()),
			handler.NewCol(InstanceColumnProjectID, e.ProjectID),
		},
		[]handler.Condition{
			handler.NewCond(InstanceColumnID, e.Aggregate().InstanceID),
		},
	), nil
}

func (p *instanceRelationalProjection) reduceConsoleSet(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.ConsoleSetEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-Dgf11", "reduce.wrong.event.type %s", instance.ConsoleSetEventType)
	}
	return handler.NewUpdateStatement(
		e,
		[]handler.Column{
			handler.NewCol(UpdatedAt, e.CreationDate()),
			handler.NewCol(InstanceColumnConsoleID, e.ClientID),
			handler.NewCol(InstanceColumnConsoleAppID, e.AppID),
		},
		[]handler.Condition{
			handler.NewCond(InstanceColumnID, e.Aggregate().InstanceID),
		},
	), nil
}

func (p *instanceRelationalProjection) reduceDefaultLanguageSet(event eventstore.Event) (*handler.Statement, error) {
	e, ok := event.(*instance.DefaultLanguageSetEvent)
	if !ok {
		return nil, zerrors.ThrowInvalidArgumentf(nil, "HANDL-30o0e", "reduce.wrong.event.type %s", instance.DefaultLanguageSetEventType)
	}
	return handler.NewUpdateStatement(
		e,
		[]handler.Column{
			handler.NewCol(UpdatedAt, e.CreationDate()),
			handler.NewCol(InstanceColumnDefaultLanguage, e.Language.String()),
		},
		[]handler.Condition{
			handler.NewCond(InstanceColumnID, e.Aggregate().InstanceID),
		},
	), nil
}