package artifacts

import (
	"errors"
	"os"
	"path/filepath"
	"testing"
	"time"

	"gitea.maximumdirect.net/eric/narratio/internal/artifactmodel"
	"gitea.maximumdirect.net/eric/narratio/internal/manifest"
)

func TestArtifactCatalogRegistersExtractionArtifactsDeterministically(t *testing.T) {
	catalog := NewArtifactCatalog()
	if err := catalog.RegisterConfiguredArtifacts(map[string]ConfiguredArtifactDefinition{
		"summary": {Enabled: true},
	}, nil); err != nil {
		t.Fatal(err)
	}
	if err := catalog.RegisterExtractionArtifacts(map[string]ExtractionArtifactDefinition{
		"zeta":    {LaneID: "zeta"},
		"summary": {LaneID: "summary"},
		"alpha":   {LaneID: "alpha"},
	}); err != nil {
		t.Fatalf("RegisterExtractionArtifacts() error = %v", err)
	}

	entries := catalog.ListExtraction()
	if len(entries) != 3 || entries[0].ExtractionKey != "alpha" || entries[1].ExtractionKey != "summary" || entries[2].ExtractionKey != "zeta" {
		t.Fatalf("ListExtraction() = %#v, want alpha, summary, zeta", entries)
	}
	extractionID, ok := catalog.SourceIDForExtractionKey("summary")
	if !ok || extractionID != "narratio.extraction.summary" {
		t.Fatalf("SourceIDForExtractionKey(summary) = %q, %v", extractionID, ok)
	}
	configuredID, _ := catalog.SourceIDForConfiguredKey("summary")
	if configuredID == extractionID {
		t.Fatalf("configured and extraction source families collided at %q", extractionID)
	}
	entry, ok := catalog.Lookup(extractionID)
	if !ok || entry.ProducerStage != "extract" || entry.OutputKind != "notarius_lane" || !entry.Planned {
		t.Fatalf("Lookup(%q) = %#v, %v", extractionID, entry, ok)
	}
}

func TestArtifactCatalogRejectsDuplicateExtractionRegistration(t *testing.T) {
	catalog := NewArtifactCatalog()
	definitions := map[string]ExtractionArtifactDefinition{"summary": {LaneID: "summary"}}
	if err := catalog.RegisterExtractionArtifacts(definitions); err != nil {
		t.Fatal(err)
	}
	if err := catalog.RegisterExtractionArtifacts(definitions); err == nil {
		t.Fatal("second RegisterExtractionArtifacts() error = nil, want collision error")
	}
}

func TestHydrateExtractionArtifactsAcceptsOnlyCompleteCurrentBundle(t *testing.T) {
	paths, currentManifest, definitions := validExtractionCatalogFixture(t)
	catalog := registeredExtractionCatalog(t, definitions)
	catalog.HydrateExtractionArtifacts(paths, currentManifest, definitions)

	entry, ok := catalog.Lookup(ExtractionArtifactSourceID("encounters"))
	if !ok || !entry.Available {
		t.Fatalf("hydrated entry = %#v, %v; want available", entry, ok)
	}
	if entry.Provenance != ArtifactProvenanceCurrentExtractManifest || entry.ProducerRunID != "extract-run-1" {
		t.Fatalf("hydrated provenance = %#v", entry)
	}
	resolved, err := ResolveSessionArtifactWithCatalog(paths, currentManifest, entry.SourceID, catalog)
	if err != nil {
		t.Fatalf("ResolveSessionArtifactWithCatalog() error = %v", err)
	}
	if resolved.Path != entry.Path || resolved.ProducerRunID != "extract-run-1" {
		t.Fatalf("resolved = %#v", resolved)
	}
}

func TestHydrateExtractionArtifactsRejectsUntrustedManifestState(t *testing.T) {
	tests := []struct {
		name   string
		mutate func(t *testing.T, paths SessionPaths, m *manifest.Manifest)
	}{
		{name: "missing stage", mutate: func(_ *testing.T, _ SessionPaths, m *manifest.Manifest) { delete(m.Stages, "extract") }},
		{name: "skipped", mutate: setExtractionStatus(manifest.StatusSkipped)},
		{name: "failed", mutate: setExtractionStatus(manifest.StatusFailed)},
		{name: "stale", mutate: setExtractionStatus(manifest.StatusStale)},
		{name: "interrupted", mutate: setExtractionStatus(manifest.StatusInterrupted)},
		{name: "missing source", mutate: func(_ *testing.T, _ SessionPaths, m *manifest.Manifest) {
			m.Stages["extract"].Outputs = m.Stages["extract"].Outputs[1:]
		}},
		{name: "inconsistent producer identity", mutate: func(_ *testing.T, _ SessionPaths, m *manifest.Manifest) {
			m.Stages["extract"].Outputs[0].ProducerRunID = "another-run"
		}},
		{name: "incompatible contract", mutate: func(_ *testing.T, _ SessionPaths, m *manifest.Manifest) {
			m.Stages["extract"].Outputs[0].Contract.SchemaVersion = "99"
		}},
		{name: "incompatible provenance", mutate: func(_ *testing.T, _ SessionPaths, m *manifest.Manifest) {
			m.Stages["extract"].Outputs[0].ExternalProvenance.RunID = "another-notarius-run"
		}},
		{name: "missing file", mutate: func(t *testing.T, _ SessionPaths, m *manifest.Manifest) {
			if err := os.Remove(m.Stages["extract"].Outputs[0].LocalPath); err != nil {
				t.Fatal(err)
			}
		}},
		{name: "tampered checksum", mutate: func(t *testing.T, _ SessionPaths, m *manifest.Manifest) {
			if err := os.WriteFile(m.Stages["extract"].Outputs[0].LocalPath, []byte(`{"tampered":true}`), 0o644); err != nil {
				t.Fatal(err)
			}
		}},
		{name: "unsafe path", mutate: func(t *testing.T, paths SessionPaths, m *manifest.Manifest) {
			outside := filepath.Join(paths.Root, "incidental.json")
			writeExtractionFixtureFile(t, outside, `{"incidental":true}`)
			m.Stages["extract"].Outputs[0].LocalPath = outside
			m.Stages["extract"].Outputs[0].Checksum = extractionFixtureChecksum(t, outside)
		}},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			paths, currentManifest, definitions := validExtractionCatalogFixture(t)
			test.mutate(t, paths, currentManifest)
			catalog := registeredExtractionCatalog(t, definitions)
			catalog.HydrateExtractionArtifacts(paths, currentManifest, definitions)
			entry, _ := catalog.Lookup(ExtractionArtifactSourceID("encounters"))
			if entry.Available {
				t.Fatalf("entry became available from %s manifest", test.name)
			}
		})
	}
}

func TestResolveExtractionArtifactNeverDiscoversIncidentalBundleFile(t *testing.T) {
	root := t.TempDir()
	paths := SessionPaths{Root: root, ArtifactsDir: filepath.Join(root, "artifacts")}
	incidental := filepath.Join(paths.ArtifactsDir, "notarius", "incidental", "lanes", "encounters.json")
	writeExtractionFixtureFile(t, incidental, `{"encounters":[]}`)
	definitions := extractionFixtureDefinitions()
	catalog := registeredExtractionCatalog(t, definitions)

	_, err := ResolveSessionArtifactWithCatalog(paths, manifest.New("session", fixtureTime), ExtractionArtifactSourceID("encounters"), catalog)
	if err == nil || !errors.Is(err, ErrSessionArtifactNotFound) {
		t.Fatalf("ResolveSessionArtifactWithCatalog() error = %v, want not found", err)
	}
}

var fixtureTime = mustFixtureTime()

func mustFixtureTime() (value time.Time) {
	return time.Date(2026, 8, 10, 0, 0, 0, 0, time.UTC)
}

func setExtractionStatus(status manifest.StageStatus) func(*testing.T, SessionPaths, *manifest.Manifest) {
	return func(_ *testing.T, _ SessionPaths, m *manifest.Manifest) { m.Stages["extract"].Status = status }
}

func extractionFixtureDefinitions() map[string]ExtractionArtifactDefinition {
	return map[string]ExtractionArtifactDefinition{
		"encounters": {
			LaneID: "encounters", PipelineID: "campaign.extract", MediaType: "application/json",
			SchemaID: "encounters", SchemaVersion: "1", ModuleKey: "encounters",
		},
	}
}

func registeredExtractionCatalog(t *testing.T, definitions map[string]ExtractionArtifactDefinition) *ArtifactCatalog {
	t.Helper()
	catalog := NewArtifactCatalog()
	if err := catalog.RegisterExtractionArtifacts(definitions); err != nil {
		t.Fatal(err)
	}
	return catalog
}

func validExtractionCatalogFixture(t *testing.T) (SessionPaths, *manifest.Manifest, map[string]ExtractionArtifactDefinition) {
	t.Helper()
	root := t.TempDir()
	paths := SessionPaths{Root: root, ArtifactsDir: filepath.Join(root, "artifacts")}
	bundleRoot := filepath.Join(paths.ArtifactsDir, "notarius", "extract-run-1")
	lanePath := filepath.Join(bundleRoot, "lanes", "encounters.json")
	indexPath := filepath.Join(bundleRoot, "index.json")
	writeExtractionFixtureFile(t, lanePath, `{"encounters":[]}`)
	writeExtractionFixtureFile(t, indexPath, `{"lanes":[]}`)
	definitions := extractionFixtureDefinitions()
	m := manifest.New("session", fixtureTime)
	m.Stages["extract"] = &manifest.StageRecord{
		Name: "extract", Status: manifest.StatusSucceeded,
		Metadata: map[string]any{
			"narratio_run_id": "extract-run-1", "bundle_root": bundleRoot,
			"receipt": map[string]any{"run_id": "notarius-run-1", "pipeline_id": "campaign.extract"},
		},
		Outputs: []manifest.ArtifactRecord{
			{
				Kind: "notarius_lane", SourceID: ExtractionArtifactSourceID("encounters"), LocalPath: lanePath,
				ProducerRunID: "extract-run-1", Checksum: extractionFixtureChecksum(t, lanePath),
				Contract:           &artifactmodel.ContractMetadata{MediaType: "application/json", SchemaID: "encounters", SchemaVersion: "1", ModuleKey: "encounters"},
				ExternalProvenance: &artifactmodel.ExternalProvenance{System: "notarius", RunID: "notarius-run-1", PipelineID: "campaign.extract", ArtifactID: "encounters"},
			},
			{Kind: "notarius_index", LocalPath: indexPath, ProducerRunID: "extract-run-1", Checksum: extractionFixtureChecksum(t, indexPath)},
		},
	}
	return paths, m, definitions
}

func writeExtractionFixtureFile(t *testing.T, path, body string) {
	t.Helper()
	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(path, []byte(body), 0o644); err != nil {
		t.Fatal(err)
	}
}

func extractionFixtureChecksum(t *testing.T, path string) string {
	t.Helper()
	checksum, err := SHA256File(path)
	if err != nil {
		t.Fatal(err)
	}
	return checksum
}