rea/src/domain/artifactIdentity.ts

import {
  artifactIntegrityPairOf,
  type ArtifactIntegrityPair,
} from "./artifactIntegrity.js";
import { posix } from "node:path";

import { digestCanonicalValue } from "./canonicalDigest.js";
import type {
  ArtifactEdge,
  ArtifactNode,
  ArtifactOccurrence,
  IntegrityContradiction,
} from "./artifactGraph.js";

/** NFC spelling of a logical archive path. Inventory and path joins share it. */
export const logicalPathNfc = (value: string): string => value.normalize("NFC");

/**
 * Lexical join against an inventoried logical path. The result is NFC.
 * `"."` is the archive root. A path that escapes the root, or that contains
 * NUL, is left in a form the caller can report; `logicalPathEscapesRoot`
 * is then true.
 */
export const normalizeJoinedLogicalPath = (value: string): string => {
  if (value.includes("\0")) return value;
  return logicalPathNfc(posix.normalize(value).replace(/^\.\//u, ""));
};

/** Whether a joined logical path leaves the archive root. */
export const logicalPathEscapesRoot = (path: string): boolean =>
  path.includes("\0") ||
  path === ".." ||
  path.startsWith("../") ||
  path.startsWith("/");

/** Content-address an artifact independently of where it was observed. */
export const artifactIdForContent = (sha256: string): string =>
  `art_${digestCanonicalValue({ sha256 }, "Artifact")}`;

/** Identify an occurrence by its root and exact logical location. */
export const occurrenceIdForLocation = (input: {
  readonly rootArtifactId: string;
  readonly logicalPath: string;
  readonly entryKind: ArtifactOccurrence["entry_kind"];
  readonly duplicateOrdinal?: number;
}): string =>
  input.logicalPath === "."
    ? `occ_${digestCanonicalValue({ root: input.rootArtifactId }, "Artifact")}`
    : `occ_${digestCanonicalValue(
        {
          root_artifact_id: input.rootArtifactId,
          logical_path: input.logicalPath,
          entry_kind: input.entryKind,
          ...(input.duplicateOrdinal === undefined
            ? {}
            : { duplicate_ordinal: input.duplicateOrdinal }),
        },
        "Artifact",
      )}`;

/** Commit to graph members in the ordering established by the inventory owner. */
export const artifactGraphDigest = (input: {
  readonly nodes: readonly ArtifactNode[];
  readonly occurrences: readonly ArtifactOccurrence[];
  readonly edges: readonly ArtifactEdge[];
  readonly contradictions: readonly IntegrityContradiction[];
}): string =>
  digestCanonicalValue(
    {
      nodes: input.nodes,
      occurrences: input.occurrences,
      edges: input.edges,
      integrity_contradictions: input.contradictions,
    },
    "Artifact",
  );

/** Bind a root artifact to its graph commitment. */
export const artifactManifestId = (
  rootArtifactId: string,
  graphSha256: string,
): string =>
  `agm_${digestCanonicalValue(
    { root_artifact_id: rootArtifactId, graph_sha256: graphSha256 },
    "Artifact",
  )}`;

/** Identify one integrity disagreement at its observed logical path. */
export const artifactContradictionId = (
  input: {
    readonly rootArtifactId: string;
    readonly logicalPath: string;
  } & (
    | { readonly declaredSha256: string; readonly observedSha256: string }
    | { readonly integrity: ArtifactIntegrityPair }
  ),
): string =>
  `ic_${digestCanonicalValue(
    {
      root_artifact_id: input.rootArtifactId,
      logical_path: input.logicalPath,
      ...("integrity" in input
        ? artifactIntegrityPairOf(input.integrity)
        : {
            declared_sha256: input.declaredSha256,
            observed_sha256: input.observedSha256,
          }),
    },
    "Artifact",
  )}`;

/**
 * Identify an edge by its semantic relationship and exact occurrence. The
 * child artifact and logical path come from that occurrence.
 */
export const artifactEdgeId = (
  edge: Pick<ArtifactEdge, "parent_artifact_id" | "relation" | "occurrence_id">,
  occurrence: Pick<ArtifactOccurrence, "artifact_id" | "logical_path">,
): string =>
  `edge_${digestCanonicalValue(
    {
      parent_artifact_id: edge.parent_artifact_id,
      child_artifact_id: occurrence.artifact_id,
      relation: edge.relation,
      occurrence_id: edge.occurrence_id,
      logical_path: occurrence.logical_path,
    },
    "Artifact",
  )}`;