import { expect, it } from "vitest";

import {
  createJavaScriptApplicationGraph,
  createJavaScriptApplicationNode,
} from "./javascriptApplicationGraph.js";
import {
  artifactEvidence,
  completeCoverage,
} from "./javascriptApplicationGraph.fixture.js";
import { compareJavaScriptApplicationVersions } from "./javascriptApplicationVersionComparison.js";

const LEFT_SHA = "a".repeat(64);
const RIGHT_SHA = "b".repeat(64);
const LIMITATION =
  "Source is outside the caller-selected source_paths; it was inventoried but not analyzed.";
const evidenceId = (character: string) => `ev_${character.repeat(64)}`;
const node = (sha256: string, path: string) =>
  createJavaScriptApplicationNode({
    kind: "javascript-asset",
    identity: { strategy: "content-digest", stability: "global-exact", sha256 },
    observations: [
      {
        label: path,
        properties: { path },
        evidence: artifactEvidence(sha256, path),
      },
    ],
  });
const unavailableScope = (
  artifactSha: string,
  state: "unknown" | "unavailable" = "unavailable",
) =>
  createJavaScriptApplicationNode({
    kind: "unknown",
    identity: {
      strategy: "artifact-local-key",
      stability: "artifact-version",
      artifact_sha256: artifactSha,
      namespace: "static-parse-scope",
      key: "select-javascript-sources:lib.js",
    },
    observations: [
      {
        label: "lib.js parse scope",
        properties: { path: "lib.js", operation: "select-javascript-sources" },
        evidence: {
          ...artifactEvidence(artifactSha, "lib.js"),
          state,
          confidence: "unknown",
          limitations: [LIMITATION],
        },
      },
    ],
  });
const observedAssetWithUnavailableFact = () => {
  const digest = "e".repeat(64);
  return createJavaScriptApplicationNode({
    kind: "javascript-asset",
    identity: {
      strategy: "content-digest",
      stability: "global-exact",
      sha256: digest,
    },
    observations: [
      {
        label: "new.js",
        properties: { path: "new.js" },
        evidence: artifactEvidence(digest, "new.js"),
      },
      {
        label: "new.js parse scope",
        properties: { operation: "parse-javascript" },
        evidence: {
          ...artifactEvidence(digest, "new.js"),
          state: "unavailable",
          confidence: "unknown",
          limitations: [LIMITATION],
        },
      },
    ],
  });
};
const graph = (nodes: ReturnType<typeof node>[]) =>
  createJavaScriptApplicationGraph({
    schema: "JavaScriptApplicationGraph",
    root_node_ids: [nodes[0]!.node_id],
    nodes,
    edges: [],
    coverage: completeCoverage,
    limitations: [],
  });
const compare = (
  left: ReturnType<typeof node>[],
  right: ReturnType<typeof node>[],
) =>
  compareJavaScriptApplicationVersions({
    left: {
      evidenceId: evidenceId("1"),
      rootArtifactSha256: LEFT_SHA,
      graph: graph(left),
    },
    right: {
      evidenceId: evidenceId("2"),
      rootArtifactSha256: RIGHT_SHA,
      graph: graph(right),
    },
    leftNativeEvidence: [],
    rightNativeEvidence: [],
  });

it("keeps unmatched unavailable scopes unknown in either direction", () => {
  const leftRoot = node("d".repeat(64), "main.js");
  const rightRoot = node("d".repeat(64), "main.js");
  const leftScope = unavailableScope(LEFT_SHA);
  const rightScope = unavailableScope(RIGHT_SHA);
  const forward = compare([leftRoot], [rightRoot, rightScope]);
  const reverse = compare([leftRoot, leftScope], [rightRoot]);

  expect(
    forward.items.find(
      ({ right_node_id }) => right_node_id === rightScope.node_id,
    ),
  ).toMatchObject({
    status: "unknown",
    dimensions: ["availability"],
    limitations: [LIMITATION],
    evidence_links: [evidenceId("1"), evidenceId("2")],
  });
  expect(
    reverse.items.find(
      ({ left_node_id }) => left_node_id === leftScope.node_id,
    ),
  ).toMatchObject({
    status: "unknown",
    dimensions: ["availability"],
    limitations: [LIMITATION],
  });
  expect(forward.summary).toMatchObject({ added: 0, removed: 0, unknown: 1 });
  expect(reverse.summary).toMatchObject({ added: 0, removed: 0, unknown: 1 });
});

it("keeps matched unavailable scopes unknown with their source limitation", () => {
  const leftRoot = node("d".repeat(64), "main.js");
  const rightRoot = node("d".repeat(64), "main.js");
  const leftScope = unavailableScope(LEFT_SHA);
  const rightScope = unavailableScope(LEFT_SHA);
  const result = compare([leftRoot, leftScope], [rightRoot, rightScope]);

  expect(
    result.items.find(({ left_node_id }) => left_node_id === leftScope.node_id),
  ).toMatchObject({
    right_node_id: rightScope.node_id,
    status: "unknown",
    dimensions: [],
    limitations: [LIMITATION],
  });
  expect(result.summary).toMatchObject({ unchanged: 1, unknown: 1 });
});

it("retains unknown scope facts and reports genuine entity changes", () => {
  const leftRoot = node("d".repeat(64), "main.js");
  const rightRoot = node("d".repeat(64), "main.js");
  const unknown = unavailableScope(RIGHT_SHA, "unknown");
  const added = node("e".repeat(64), "new.js");
  const removed = node("f".repeat(64), "removed.js");
  const mixedEvidenceAddition = observedAssetWithUnavailableFact();
  const unknownResult = compare([leftRoot], [rightRoot, unknown]);
  const addedResult = compare([leftRoot], [rightRoot, added]);
  const removedResult = compare([leftRoot, removed], [rightRoot]);
  const mixedResult = compare([leftRoot], [rightRoot, mixedEvidenceAddition]);

  expect(
    unknownResult.items.find(
      ({ right_node_id }) => right_node_id === unknown.node_id,
    ),
  ).toMatchObject({ status: "unknown", limitations: [LIMITATION] });
  expect(unknownResult.summary).toMatchObject({ added: 0, unknown: 1 });
  expect(
    addedResult.items.find(
      ({ right_node_id }) => right_node_id === added.node_id,
    ),
  ).toMatchObject({ status: "added", dimensions: ["availability"] });
  expect(addedResult.summary.added).toBe(1);
  expect(
    mixedResult.items.find(
      ({ right_node_id }) => right_node_id === mixedEvidenceAddition.node_id,
    ),
  ).toMatchObject({ status: "added", limitations: [LIMITATION] });
  expect(mixedResult.summary.added).toBe(1);
  expect(
    removedResult.items.find(
      ({ left_node_id }) => left_node_id === removed.node_id,
    ),
  ).toMatchObject({ status: "removed", dimensions: ["availability"] });
  expect(removedResult.summary.removed).toBe(1);
  expect(
    compare(
      [leftRoot, node("c".repeat(64), "same.js")],
      [rightRoot, node("c".repeat(64), "same.js")],
    ).summary,
  ).toMatchObject({
    unchanged: 2,
    added: 0,
    removed: 0,
  });
});