package host

import (
	"context"
	"errors"
	"github.com/carlosframework/platform/internal/activator"
	"github.com/carlosframework/platform/internal/hostbox"
	"github.com/carlosframework/platform/internal/hostclaim"
	"github.com/carlosframework/platform/internal/hostfiles"
	"github.com/carlosframework/platform/internal/registry"
)

func settleFilesSeedRerun(ctx context.Context, rt registry.Route, files *movesFiles, retries activator.ServingRetries, expected hostclaim.Observed, exclusion *activator.SeedExclusion) (hostclaim.Observed, error) {
	if err := exclusion.Check(rt.Host); err != nil {
		return hostclaim.Observed{}, err
	}
	if expected.Host != rt.Host || expected.Claim == nil || expected.Claim.Holder == nil {
		return hostclaim.Observed{}, hostbox.ErrChanged
	}
	if _, err := checkFilesSeedLayout(files, rt, claimEmptyBootstrap(expected.Claim.Holder)); err != nil {
		return hostclaim.Observed{}, err
	}
	fresh, err := retries.SettleAbandoned(ctx, expected)
	if err != nil {
		return hostclaim.Observed{}, err
	}
	if err := exclusion.Check(rt.Host); err != nil {
		return hostclaim.Observed{}, err
	}
	return fresh, nil
}

func (s *filesSeedOperation) prerequisites(exclusion *activator.SeedExclusion) func(context.Context, registry.Route, hostclaim.Observed) error {
	return func(ctx context.Context, rt registry.Route, o hostclaim.Observed) error {
		if err := exclusion.Check(rt.Host); err != nil {
			return err
		}
		if s == nil || s.ctx == nil || s.ctx.Err() != nil || s.selected.State != "eligible" || o.Host != s.selected.Observation.Host || o.ETag != s.selected.Observation.ETag || s.bound != (servingArtifactIdentity{}) {
			return hostbox.ErrChanged
		}
		if err := s.files.checkServingFilesEvidence(ctx, o, rt); !errors.Is(err, hostfiles.ErrNoEvidence) {
			if err == nil {
				return hostfiles.ErrManifestExists
			}
			return err
		}
		selected, err := inspectFilesSeed(ctx, s.claims, s.files, o, s.actor, &rt)
		if err != nil {
			return err
		}
		if selected.State != "eligible" {
			return hostbox.ErrChanged
		}
		return nil
	}
}