package pds

import (
	"testing"

	"atcr.io/pkg/atproto"
)

func TestCreateLayerRecord(t *testing.T) {
	// Setup test PDS
	pds, ctx := setupTestPDS(t)

	tests := []struct {
		name      string
		record    *atproto.LayerRecord
		wantErr   bool
		errSubstr string
	}{
		{
			name: "valid layer record",
			record: atproto.NewLayerRecord(
				"sha256:abc123def456",
				1048576, // 1 MB
				"application/vnd.oci.image.layer.v1.tar+gzip",
				"myapp",
				"did:plc:alice123",
				"alice.bsky.social",
			),
			wantErr: false,
		},
		{
			name: "valid layer record with large size",
			record: atproto.NewLayerRecord(
				"sha256:fedcba987654",
				1073741824, // 1 GB
				"application/vnd.docker.image.rootfs.diff.tar.gzip",
				"debian",
				"did:plc:bob456",
				"bob.example.com",
			),
			wantErr: false,
		},
		{
			name: "invalid record type",
			record: &atproto.LayerRecord{
				Type:       "wrong.type",
				Digest:     "sha256:abc123",
				Size:       1024,
				MediaType:  "application/vnd.oci.image.layer.v1.tar",
				Repository: "test",
				UserDID:    "did:plc:test",
				UserHandle: "test.example.com",
			},
			wantErr:   true,
			errSubstr: "invalid record type",
		},
		{
			name: "missing digest",
			record: &atproto.LayerRecord{
				Type:       atproto.LayerCollection,
				Digest:     "",
				Size:       1024,
				MediaType:  "application/vnd.oci.image.layer.v1.tar",
				Repository: "test",
				UserDID:    "did:plc:test",
				UserHandle: "test.example.com",
			},
			wantErr:   true,
			errSubstr: "digest is required",
		},
		{
			name: "zero size",
			record: &atproto.LayerRecord{
				Type:       atproto.LayerCollection,
				Digest:     "sha256:abc123",
				Size:       0,
				MediaType:  "application/vnd.oci.image.layer.v1.tar",
				Repository: "test",
				UserDID:    "did:plc:test",
				UserHandle: "test.example.com",
			},
			wantErr:   true,
			errSubstr: "size must be positive",
		},
		{
			name: "negative size",
			record: &atproto.LayerRecord{
				Type:       atproto.LayerCollection,
				Digest:     "sha256:abc123",
				Size:       -1,
				MediaType:  "application/vnd.oci.image.layer.v1.tar",
				Repository: "test",
				UserDID:    "did:plc:test",
				UserHandle: "test.example.com",
			},
			wantErr:   true,
			errSubstr: "size must be positive",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			rkey, cid, err := pds.CreateLayerRecord(ctx, tt.record)

			if tt.wantErr {
				if err == nil {
					t.Errorf("CreateLayerRecord() expected error containing %q, got nil", tt.errSubstr)
					return
				}
				if tt.errSubstr != "" && !contains(err.Error(), tt.errSubstr) {
					t.Errorf("CreateLayerRecord() error = %v, want error containing %q", err, tt.errSubstr)
				}
				return
			}

			if err != nil {
				t.Errorf("CreateLayerRecord() unexpected error: %v", err)
				return
			}

			if rkey == "" {
				t.Error("CreateLayerRecord() returned empty rkey")
			}

			if cid == "" {
				t.Error("CreateLayerRecord() returned empty CID")
			}

			t.Logf("Created layer record: rkey=%s, cid=%s", rkey, cid)
		})
	}
}

func TestCreateLayerRecord_MultipleRecords(t *testing.T) {
	// Test creating multiple layer records for the same manifest
	pds, ctx := setupTestPDS(t)

	layers := []struct {
		digest string
		size   int64
	}{
		{"sha256:layer1abc123", 1024},
		{"sha256:layer2def456", 2048},
		{"sha256:layer3ghi789", 4096},
	}

	createdRKeys := make(map[string]bool)

	for i, layer := range layers {
		record := atproto.NewLayerRecord(
			layer.digest,
			layer.size,
			"application/vnd.oci.image.layer.v1.tar+gzip",
			"multi-layer-app",
			"did:plc:test123",
			"test.example.com",
		)

		rkey, cid, err := pds.CreateLayerRecord(ctx, record)
		if err != nil {
			t.Fatalf("CreateLayerRecord() for layer %d failed: %v", i, err)
		}

		// Ensure unique rkeys
		if createdRKeys[rkey] {
			t.Errorf("CreateLayerRecord() returned duplicate rkey: %s", rkey)
		}
		createdRKeys[rkey] = true

		t.Logf("Layer %d: rkey=%s, cid=%s", i, rkey, cid)
	}

	if len(createdRKeys) != len(layers) {
		t.Errorf("Created %d unique rkeys, want %d", len(createdRKeys), len(layers))
	}
}

func TestNewLayerRecord(t *testing.T) {
	// Test the layer record constructor
	digest := "sha256:abc123def456"
	size := int64(1048576)
	mediaType := "application/vnd.oci.image.layer.v1.tar+gzip"
	repository := "myapp"
	userDID := "did:plc:alice123"
	userHandle := "alice.bsky.social"

	record := atproto.NewLayerRecord(digest, size, mediaType, repository, userDID, userHandle)

	if record == nil {
		t.Fatal("NewLayerRecord() returned nil")
	}

	// Verify all fields are set correctly
	if record.Type != atproto.LayerCollection {
		t.Errorf("Type = %q, want %q", record.Type, atproto.LayerCollection)
	}

	if record.Digest != digest {
		t.Errorf("Digest = %q, want %q", record.Digest, digest)
	}

	if record.Size != size {
		t.Errorf("Size = %d, want %d", record.Size, size)
	}

	if record.MediaType != mediaType {
		t.Errorf("MediaType = %q, want %q", record.MediaType, mediaType)
	}

	if record.Repository != repository {
		t.Errorf("Repository = %q, want %q", record.Repository, repository)
	}

	if record.UserDID != userDID {
		t.Errorf("UserDID = %q, want %q", record.UserDID, userDID)
	}

	if record.UserHandle != userHandle {
		t.Errorf("UserHandle = %q, want %q", record.UserHandle, userHandle)
	}

	if record.CreatedAt == "" {
		t.Error("CreatedAt is empty")
	}

	t.Logf("Created layer record: %+v", record)
}

func TestLayerRecord_FieldValidation(t *testing.T) {
	// Test various field values
	tests := []struct {
		name       string
		digest     string
		size       int64
		mediaType  string
		repository string
		userDID    string
		userHandle string
	}{
		{
			name:       "typical OCI layer",
			digest:     "sha256:e692418e4cbaf90ca69d05a66403747baa33ee08806650b51fab815ad7fc331f",
			size:       12582912, // 12 MB
			mediaType:  "application/vnd.oci.image.layer.v1.tar+gzip",
			repository: "hsm-secrets-operator",
			userDID:    "did:plc:evan123",
			userHandle: "evan.jarrett.net",
		},
		{
			name:       "Docker layer format",
			digest:     "sha256:abc123",
			size:       1024,
			mediaType:  "application/vnd.docker.image.rootfs.diff.tar.gzip",
			repository: "nginx",
			userDID:    "did:plc:user456",
			userHandle: "user.example.com",
		},
		{
			name:       "uncompressed layer",
			digest:     "sha256:def456",
			size:       2048,
			mediaType:  "application/vnd.oci.image.layer.v1.tar",
			repository: "alpine",
			userDID:    "did:plc:user789",
			userHandle: "user.bsky.social",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			record := atproto.NewLayerRecord(
				tt.digest,
				tt.size,
				tt.mediaType,
				tt.repository,
				tt.userDID,
				tt.userHandle,
			)

			if record == nil {
				t.Fatal("NewLayerRecord() returned nil")
			}

			// Verify the record can be created
			if record.Type != atproto.LayerCollection {
				t.Errorf("Type = %q, want %q", record.Type, atproto.LayerCollection)
			}

			if record.Digest != tt.digest {
				t.Errorf("Digest = %q, want %q", record.Digest, tt.digest)
			}
		})
	}
}