package command

import (
	"context"

	"github.com/zitadel/zitadel/internal/api/authz"
	"github.com/zitadel/zitadel/internal/command/preparation"
	"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/instance"
	"github.com/zitadel/zitadel/internal/telemetry/tracing"
)

func (c *Commands) AddDefaultDomainPolicy(ctx context.Context, userLoginMustBeDomain, validateOrgDomains, smtpSenderAddressMatchesInstanceDomain bool) (*domain.ObjectDetails, error) {
	instanceAgg := instance.NewAggregate(authz.GetInstance(ctx).InstanceID())
	cmds, err := preparation.PrepareCommands(ctx, c.eventstore.Filter, prepareAddDefaultDomainPolicy(instanceAgg, userLoginMustBeDomain, validateOrgDomains, smtpSenderAddressMatchesInstanceDomain))
	if err != nil {
		return nil, err
	}
	pushedEvents, err := c.eventstore.Push(ctx, cmds...)
	if err != nil {
		return nil, err
	}
	return pushedEventsToObjectDetails(pushedEvents), nil
}

func (c *Commands) ChangeDefaultDomainPolicy(ctx context.Context, policy *domain.DomainPolicy) (*domain.DomainPolicy, error) {
	existingPolicy, err := c.defaultDomainPolicyWriteModelByID(ctx)
	if err != nil {
		return nil, err
	}
	if !existingPolicy.State.Exists() {
		return nil, caos_errs.ThrowNotFound(nil, "INSTANCE-0Pl0d", "Errors.IAM.DomainPolicy.NotFound")
	}

	instanceAgg := InstanceAggregateFromWriteModel(&existingPolicy.PolicyDomainWriteModel.WriteModel)
	changedEvent, hasChanged := existingPolicy.NewChangedEvent(ctx, instanceAgg, policy.UserLoginMustBeDomain, policy.ValidateOrgDomains, policy.SMTPSenderAddressMatchesInstanceDomain)
	if !hasChanged {
		return nil, caos_errs.ThrowPreconditionFailed(nil, "INSTANCE-pl9fN", "Errors.IAM.DomainPolicy.NotChanged")
	}

	pushedEvents, err := c.eventstore.Push(ctx, changedEvent)
	if err != nil {
		return nil, err
	}
	err = AppendAndReduce(existingPolicy, pushedEvents...)
	if err != nil {
		return nil, err
	}
	return writeModelToDomainPolicy(existingPolicy), nil
}

func (c *Commands) getDefaultDomainPolicy(ctx context.Context) (*domain.DomainPolicy, error) {
	policyWriteModel, err := c.defaultDomainPolicyWriteModelByID(ctx)
	if err != nil {
		return nil, err
	}
	if !policyWriteModel.State.Exists() {
		return nil, caos_errs.ThrowInvalidArgument(nil, "INSTANCE-3n8fs", "Errors.IAM.PasswordComplexityPolicy.NotFound")
	}
	policy := writeModelToDomainPolicy(policyWriteModel)
	policy.Default = true
	return policy, nil
}

func (c *Commands) defaultDomainPolicyWriteModelByID(ctx context.Context) (policy *InstanceDomainPolicyWriteModel, err error) {
	ctx, span := tracing.NewSpan(ctx)
	defer func() { span.EndWithError(err) }()

	writeModel := NewInstanceDomainPolicyWriteModel(ctx)
	err = c.eventstore.FilterToQueryReducer(ctx, writeModel)
	if err != nil {
		return nil, err
	}
	return writeModel, nil
}

func prepareAddDefaultDomainPolicy(
	a *instance.Aggregate,
	userLoginMustBeDomain,
	validateOrgDomains,
	smtpSenderAddressMatchesInstanceDomain bool,
) preparation.Validation {
	return func() (preparation.CreateCommands, error) {
		return func(ctx context.Context, filter preparation.FilterToQueryReducer) ([]eventstore.Command, error) {
			writeModel := NewInstanceDomainPolicyWriteModel(ctx)
			events, err := filter(ctx, writeModel.Query())
			if err != nil {
				return nil, err
			}
			writeModel.AppendEvents(events...)
			if err = writeModel.Reduce(); err != nil {
				return nil, err
			}
			if writeModel.State == domain.PolicyStateActive {
				return nil, caos_errs.ThrowAlreadyExists(nil, "INSTANCE-Lk0dS", "Errors.Instance.DomainPolicy.AlreadyExists")
			}
			return []eventstore.Command{
				instance.NewDomainPolicyAddedEvent(ctx, &a.Aggregate,
					userLoginMustBeDomain,
					validateOrgDomains,
					smtpSenderAddressMatchesInstanceDomain,
				),
			}, nil
		}, nil
	}
}