package pipeline

import (
	"encoding/json"
	"path/filepath"
	"testing"

	"git.westgate.pw/ShadowsOverWestgate/sow-tools/internal/buildinfo"
	"git.westgate.pw/ShadowsOverWestgate/sow-tools/internal/erf"
)

const validAsset = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"

// directManifestFixture returns a minimal valid direct source manifest using the
// running builder identity, so validation does not reject it on builder mismatch.
func directManifestFixture() *SourceBuildManifest {
	return &SourceBuildManifest{
		Schema:     1,
		BuilderID:  buildinfo.String(),
		ModuleHAKs: []string{"core_01"},
		HAKs: []SourceManifestHAK{
			{
				Name:     "core_01",
				Group:    "core",
				Priority: 1,
				MaxBytes: 1024,
				Assets:   []string{"core/a.tga"},
			},
		},
		AssetSources: map[string]SourceAsset{
			"core/a.tga": {SHA256: validAsset, SizeBytes: 4},
		},
	}
}

func writeManifestFixture(t *testing.T, manifest *SourceBuildManifest) string {
	t.Helper()
	raw, err := json.Marshal(manifest)
	if err != nil {
		t.Fatalf("marshal fixture: %v", err)
	}
	path := filepath.Join(t.TempDir(), "build-source-manifest.json")
	mustWriteFile(t, path, string(raw))
	return path
}

func TestLoadSourceBuildManifestDirect(t *testing.T) {
	path := writeManifestFixture(t, directManifestFixture())

	manifest, err := loadSourceBuildManifest(path)
	if err != nil {
		t.Fatalf("load: %v", err)
	}
	if manifest.Schema != 1 {
		t.Fatalf("schema = %d, want 1", manifest.Schema)
	}
	if manifest.BuilderID != buildinfo.String() {
		t.Fatalf("builder_id = %q, want %q", manifest.BuilderID, buildinfo.String())
	}
	if len(manifest.HAKs) != 1 || manifest.HAKs[0].Name != "core_01" {
		t.Fatalf("unexpected haks: %#v", manifest.HAKs)
	}
	source, ok := manifest.AssetSources["core/a.tga"]
	if !ok || source.SHA256 != validAsset || source.SizeBytes != 4 {
		t.Fatalf("unexpected asset source: %#v", manifest.AssetSources)
	}
	if err := validateDirectSourceManifest(manifest); err != nil {
		t.Fatalf("validate valid manifest: %v", err)
	}
}

func TestValidateDirectSourceManifestRejectsUnsupportedSchema(t *testing.T) {
	manifest := directManifestFixture()
	manifest.Schema = 2
	if err := validateDirectSourceManifest(manifest); err == nil {
		t.Fatal("expected schema rejection")
	}
}

func TestValidateDirectSourceManifestRejectsBadSHA(t *testing.T) {
	manifest := directManifestFixture()
	manifest.AssetSources["core/a.tga"] = SourceAsset{SHA256: "NOTHEX", SizeBytes: 4}
	if err := validateDirectSourceManifest(manifest); err == nil {
		t.Fatal("expected bad sha rejection")
	}
}

func TestValidateDirectSourceManifestRejectsNegativeSize(t *testing.T) {
	manifest := directManifestFixture()
	manifest.AssetSources["core/a.tga"] = SourceAsset{SHA256: validAsset, SizeBytes: -1}
	if err := validateDirectSourceManifest(manifest); err == nil {
		t.Fatal("expected negative size rejection")
	}
}

func TestValidateDirectSourceManifestRejectsMissingSource(t *testing.T) {
	manifest := directManifestFixture()
	delete(manifest.AssetSources, "core/a.tga")
	if err := validateDirectSourceManifest(manifest); err == nil {
		t.Fatal("expected missing source rejection")
	}
}

func TestValidateDirectSourceManifestRejectsUnusedSource(t *testing.T) {
	manifest := directManifestFixture()
	manifest.AssetSources["core/orphan.tga"] = SourceAsset{SHA256: validAsset, SizeBytes: 4}
	if err := validateDirectSourceManifest(manifest); err == nil {
		t.Fatal("expected unused source rejection")
	}
}

func TestValidateDirectSourceManifestRejectsDuplicateAssetAcrossHAKs(t *testing.T) {
	manifest := directManifestFixture()
	manifest.HAKs = append(manifest.HAKs, SourceManifestHAK{
		Name:     "core_02",
		Group:    "core",
		Priority: 1,
		MaxBytes: 1024,
		Assets:   []string{"core/a.tga"},
	})
	if err := validateDirectSourceManifest(manifest); err == nil {
		t.Fatal("expected duplicate-asset rejection")
	}
}

func TestValidateDirectSourceManifestRejectsTraversalPath(t *testing.T) {
	manifest := directManifestFixture()
	manifest.HAKs[0].Assets = []string{"../escape.tga"}
	manifest.AssetSources = map[string]SourceAsset{
		"../escape.tga": {SHA256: validAsset, SizeBytes: 4},
	}
	if err := validateDirectSourceManifest(manifest); err == nil {
		t.Fatal("expected traversal rejection")
	}
}

func TestValidateDirectSourceManifestRejectsBuilderMismatch(t *testing.T) {
	manifest := directManifestFixture()
	manifest.BuilderID = "crucible deadbeef"
	if err := validateDirectSourceManifest(manifest); err == nil {
		t.Fatal("expected builder mismatch rejection")
	}
}

// Two distinct source paths can collapse to the same resref+type; the chunker
// must reject that rather than let one silently shadow the other in the ERF.
func TestChunksFromManifestRejectsResrefCollision(t *testing.T) {
	tga, ok := erf.HAKResourceTypeForExtension("tga")
	if !ok {
		t.Fatal("tga is not a hak resource type")
	}
	mk := func(rel, resref string) assetResource {
		r := erf.Resource{Name: resref, Type: tga}
		return assetResource{Rel: rel, Resource: r, Size: erf.ArchiveSize([]erf.Resource{r})}
	}
	entry := BuildManifestHAK{Name: "core_01", Group: "core"}

	collide := []assetResource{mk("creature/foo.tga", "foo"), mk("placeable/foo.tga", "foo")}
	entry.Assets = []string{"creature/foo.tga", "placeable/foo.tga"}
	if _, err := chunksFromManifest(collide, []BuildManifestHAK{entry}); err == nil {
		t.Fatal("expected resref+type collision rejection")
	}

	distinct := []assetResource{mk("creature/foo.tga", "foo"), mk("placeable/bar.tga", "bar")}
	entry.Assets = []string{"creature/foo.tga", "placeable/bar.tga"}
	if _, err := chunksFromManifest(distinct, []BuildManifestHAK{entry}); err != nil {
		t.Fatalf("distinct resrefs should pack cleanly: %v", err)
	}
}

func TestContentAddressedBlobPath(t *testing.T) {
	root := "/var/cache/blobs"
	got, err := contentAddressedBlobPath(root, validAsset)
	if err != nil {
		t.Fatalf("blob path: %v", err)
	}
	want := filepath.Join(root, "sha256", "aa", "aa", validAsset)
	if got != want {
		t.Fatalf("blob path = %q, want %q", got, want)
	}
	if _, err := contentAddressedBlobPath(root, "NOTHEX"); err == nil {
		t.Fatal("expected invalid sha rejection")
	}
	if _, err := contentAddressedBlobPath("", validAsset); err == nil {
		t.Fatal("expected empty root rejection")
	}
}