package runner

import (
	"context"
	"reflect"
	"testing"

	"gitea.maximumdirect.net/eric/notarius/internal/core/artifacts"
	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/extractorregistry"
	validationhelpers "gitea.maximumdirect.net/eric/notarius/internal/framework/validators"
)

func TestRunnerUsesExtractorRegistry(t *testing.T) {
	var builtKeys []string
	var executedKeys []string
	registry := extractorregistry.New()

	registerIntegrationExtractor(t, registry, "second", &builtKeys, &executedKeys, []contracts.Validator{
		integrationValidator{name: "reject-second", approve: false},
	})
	registerIntegrationExtractor(t, registry, "first", &builtKeys, &executedKeys, []contracts.Validator{
		integrationValidator{name: "approve-first", approve: true},
	})

	output, err := New(registry).Run(context.Background(), RunInput{
		Source:        integrationSourceDocument(),
		ExtractorKeys: []string{"second", "first"},
	})
	if err != nil {
		t.Fatalf("Run() error = %v, want nil", err)
	}

	if !reflect.DeepEqual(builtKeys, []string{"second", "first"}) {
		t.Fatalf("built keys = %#v, want configured order", builtKeys)
	}
	if !reflect.DeepEqual(executedKeys, []string{"second", "first"}) {
		t.Fatalf("executed keys = %#v, want configured order", executedKeys)
	}
	if got := artifactKeys(output.Approved); !reflect.DeepEqual(got, []string{"first"}) {
		t.Fatalf("approved keys = %#v, want [first]", got)
	}
	if got := rejectedKeys(output.Rejected); !reflect.DeepEqual(got, []string{"second"}) {
		t.Fatalf("rejected keys = %#v, want [second]", got)
	}
}

func registerIntegrationExtractor(t *testing.T, registry *extractorregistry.Registry, key string, builtKeys *[]string, executedKeys *[]string, validators []contracts.Validator) {
	t.Helper()

	if err := registry.Register(key, func() (contracts.Extractor, error) {
		*builtKeys = append(*builtKeys, key)
		return integrationExtractor{key: key, executedKeys: executedKeys, validators: validators}, nil
	}); err != nil {
		t.Fatalf("Register(%q) error = %v, want nil", key, err)
	}
}

type integrationExtractor struct {
	key          string
	executedKeys *[]string
	validators   []contracts.Validator
}

func (extractor integrationExtractor) Key() string {
	return extractor.key
}

func (extractor integrationExtractor) ArtifactType() string {
	return "generic-artifact"
}

func (extractor integrationExtractor) SchemaVersion() string {
	return "v1"
}

func (extractor integrationExtractor) Validators() []contracts.Validator {
	return extractor.validators
}

func (extractor integrationExtractor) Extract(ctx context.Context, req contracts.ExtractionRequest) (contracts.ExtractionResult, error) {
	*extractor.executedKeys = append(*extractor.executedKeys, extractor.key)
	return contracts.ExtractionResult{
		Candidates: []artifacts.Candidate{
			{Payload: []byte(`{"value":true}`)},
		},
	}, nil
}

type integrationValidator struct {
	name    string
	approve bool
}

func (validator integrationValidator) Name() string {
	return validator.name
}

func (validator integrationValidator) Validate(ctx context.Context, req contracts.ValidationRequest) (contracts.ValidationResult, error) {
	decisions := make([]contracts.ValidationDecision, 0, len(req.Candidates))
	for _, candidate := range req.Candidates {
		if validator.approve {
			decisions = append(decisions, validationhelpers.Approved(candidate.Index))
		} else {
			decisions = append(decisions, validationhelpers.Rejected(candidate.Index, "invalid", "not accepted"))
		}
	}
	return contracts.ValidationResult{
		ValidatorName: validator.name,
		Decisions:     decisions,
	}, nil
}

func integrationSourceDocument() *source.SourceDocument {
	return &source.SourceDocument{
		ID:     "source-1",
		Kind:   "document",
		Format: "text/plain",
		Digest: "sha256:abc123",
		Units: []source.SourceUnit{
			{ID: "u1", Kind: "unit", Text: "Source unit."},
		},
	}
}

func artifactKeys(approved []artifacts.Artifact) []string {
	keys := make([]string, 0, len(approved))
	for _, artifact := range approved {
		keys = append(keys, artifact.ExtractorKey)
	}
	return keys
}

func rejectedKeys(rejected []artifacts.RejectedArtifact) []string {
	keys := make([]string, 0, len(rejected))
	for _, artifact := range rejected {
		keys = append(keys, artifact.Candidate.ExtractorKey)
	}
	return keys
}