import assert from "node:assert/strict";
import crypto from "node:crypto";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { pathToFileURL } from "node:url";
import test from "node:test";
import ts from "typescript";

const root = path.resolve(import.meta.dirname, "../../..");
const temporary = fs.mkdtempSync(path.join(os.tmpdir(), "library-linked-missing-unit-"));
const sourcePath = path.join(root, "web/protocol/library-linked-missing.ts");
const transpiled = ts.transpileModule(fs.readFileSync(sourcePath, "utf8"), {
  compilerOptions: { module: ts.ModuleKind.ES2022, target: ts.ScriptTarget.ES2022 },
  fileName: sourcePath,
  reportDiagnostics: true,
});
assert.deepEqual(transpiled.diagnostics, []);
fs.writeFileSync(path.join(temporary, "library-linked-missing.mjs"), transpiled.outputText);
const missing = await import(pathToFileURL(path.join(temporary, "library-linked-missing.mjs")));
const manifest = JSON.parse(fs.readFileSync(path.join(root, "tests/golden/M12-03I/manifest.json"), "utf8"));
const sha256 = (file) => crypto.createHash("sha256").update(fs.readFileSync(path.join(root, file))).digest("hex");
const library = (value) => `library:${String(value).repeat(64).slice(0, 64)}`;
const digest = (value) => crypto.createHash("sha256").update(String(value)).digest("hex");
const reference = (sourceLibraryId, generation, revision, marker, status = "AVAILABLE") => ({
  sourceLibraryId,
  sourceLocator: `project://libraries/${marker}.blend`,
  sourceSha256: digest(`${marker}-source`),
  sourceGeneration: generation,
  sourceRevision: revision,
  dataBlockIds: [`Object/${marker}`, `Mesh/${marker}`],
  status,
  placeholder: status === "MISSING" ? {
    kind: "MISSING_LIBRARY",
    sourceLibraryId,
    dataBlockIds: [`Object/${marker}`, `Mesh/${marker}`],
  } : null,
});

test("M12-03I binds the missing-library protocol and evidence artifacts", () => {
  assert.equal(manifest.task, "M12-03I");
  assert.equal(manifest.parentTask, "M12-03H");
  assert.equal(manifest.nextTask, "M12-03J");
  for (const artifact of Object.values(manifest.artifacts)) assert.equal(sha256(artifact.path), artifact.sha256, artifact.path);
});

test("M12-03I marks only the matching reference missing and preserves its original source", () => {
  const sourceLibraryId = library("a");
  const otherLibraryId = library("b");
  const current = reference(sourceLibraryId, 4, 9, "primary");
  const other = reference(otherLibraryId, 1, 2, "other");
  const state = { schemaVersion: 1, references: [current, other] };
  const decision = missing.markLinkedLibraryMissing(state, {
    schemaVersion: 1,
    operation: "MARK_MISSING",
    sourceLibraryId,
    sourceLocator: current.sourceLocator,
    sourceSha256: current.sourceSha256,
    expectedGeneration: 4,
    expectedRevision: 9,
  });
  assert.equal(decision.status, "MARKED");
  assert.equal(decision.code, null);
  assert.deepEqual(decision.state.references[0], { ...current, status: "MISSING", placeholder: {
    kind: "MISSING_LIBRARY", sourceLibraryId, dataBlockIds: current.dataBlockIds,
  } });
  assert.deepEqual(decision.state.references[1], other);
  assert.deepEqual(state.references, [current, other]);
});

test("M12-03I preserves the reference on stale generation and source hash drift", () => {
  const sourceLibraryId = library("c");
  const current = reference(sourceLibraryId, 2, 5, "stable");
  const state = { schemaVersion: 1, references: [current] };
  const base = {
    schemaVersion: 1,
    operation: "MARK_MISSING",
    sourceLibraryId,
    sourceLocator: current.sourceLocator,
    sourceSha256: current.sourceSha256,
    expectedGeneration: 2,
    expectedRevision: 5,
  };
  assert.equal(missing.markLinkedLibraryMissing(state, { ...base, expectedRevision: 6 }).code, "REVISION_CONFLICT");
  assert.equal(missing.markLinkedLibraryMissing(state, { ...base, sourceSha256: digest("different") }).code, "ASSET_SOURCE_HASH_MISMATCH");
  assert.deepEqual(state.references, [current]);
});

test("M12-03I rejects undeclared fields, duplicate identities, and invalid placeholders", () => {
  const sourceLibraryId = library("d");
  const current = reference(sourceLibraryId, 1, 1, "invalid");
  assert.throws(() => missing.parseLinkedMissingRequest({
    schemaVersion: 1,
    operation: "MARK_MISSING",
    sourceLibraryId,
    sourceLocator: current.sourceLocator,
    sourceSha256: current.sourceSha256,
    expectedGeneration: 1,
    expectedRevision: 1,
    future: true,
  }), { code: "TASK_VALIDATION_FAILED" });
  assert.throws(() => missing.parseLinkedMissingState({ schemaVersion: 1, references: [current, current] }), { code: "TASK_VALIDATION_FAILED" });
  assert.throws(() => missing.parseLinkedLibraryReference({ ...current, status: "MISSING", placeholder: null }), { code: "TASK_VALIDATION_FAILED" });
  assert.throws(() => missing.parseLinkedLibraryReference({ ...current, status: "AVAILABLE", placeholder: { kind: "MISSING_LIBRARY", sourceLibraryId, dataBlockIds: current.dataBlockIds } }), { code: "TASK_VALIDATION_FAILED" });
});

test.after(() => fs.rmSync(temporary, { recursive: true, force: true }));