import { readFile } from "node:fs/promises";
import { spawnSync } from "node:child_process";

import { CACHEABLE_ASSET_CONTENT_TYPES } from "../src/contracts/service-worker-static-manifest.ts";

/**
 * GOV-01 / SW-RR-03. Structural gates for facts that a hand-maintained document
 * cannot keep true.
 *
 * The adapter review inventory claimed 118/118 while the tree held 119 files,
 * so a whole adapter was outside every review's coverage without anything
 * failing. And the Service Worker asset generator and the shared manifest
 * decoder each carried their own extension table, so a build could emit an
 * asset the runtime contract then refused. Both are now equalities this script
 * checks rather than numbers someone has to remember to update.
 */

const INVENTORY_PATH = "docs/reviews/adapters/INVENTORY.md";
const GENERATOR_PATH = "scripts/generate-service-worker-assets.ts";

function trackedAdapterFiles(): readonly string[] {
  const listed = spawnSync("git", ["ls-files", "src/adapters"], {
    encoding: "utf8",
  });
  if (listed.status !== 0) {
    throw new Error(`git ls-files failed: ${listed.stderr}`);
  }
  return listed.stdout.split("\n").filter(Boolean).sort();
}

function inventoryRows(markdown: string): readonly string[] {
  const rows: string[] = [];
  for (const line of markdown.split("\n")) {
    const match = /^\|\s*\d+\s*\|\s*`([^`]+)`\s*\|/u.exec(line);
    if (match?.[1]) rows.push(match[1]);
  }
  return rows;
}

function reportDifference(
  label: string,
  expected: readonly string[],
  actual: readonly string[],
): readonly string[] {
  const missing = expected.filter((value) => !actual.includes(value));
  const extra = actual.filter((value) => !expected.includes(value));
  const problems: string[] = [];
  for (const value of missing) problems.push(`${label}: missing ${value}`);
  for (const value of extra) problems.push(`${label}: unexpected ${value}`);
  return problems;
}

async function main(): Promise<void> {
  const problems: string[] = [];

  const tracked = trackedAdapterFiles();
  const markdown = await readFile(INVENTORY_PATH, "utf8");
  const listed = inventoryRows(markdown);
  problems.push(...reportDifference("adapter inventory", tracked, listed));
  if (listed.length !== new Set(listed).size) {
    problems.push("adapter inventory: duplicate row");
  }
  const total = /합계: \*\*(\d+)\/(\d+)\*\*/u.exec(markdown);
  if (
    !total ||
    Number(total[1]) !== tracked.length ||
    Number(total[2]) !== tracked.length
  ) {
    problems.push(
      `adapter inventory: total does not equal ${tracked.length} tracked files`,
    );
  }

  // SW-RR-03. The generator must read the shared table rather than declare one.
  const generator = await readFile(GENERATOR_PATH, "utf8");
  if (!generator.includes("CACHEABLE_ASSET_CONTENT_TYPES")) {
    problems.push(
      "service worker assets: generator does not use the shared extension table",
    );
  }
  if (/const CACHEABLE_EXTENSIONS[^=]*=\s*Object\.freeze\(\{/u.test(generator)) {
    problems.push(
      "service worker assets: generator declares its own extension table",
    );
  }
  for (const [extension, contentType] of Object.entries(
    CACHEABLE_ASSET_CONTENT_TYPES,
  )) {
    if (!extension.startsWith(".") || contentType.length === 0) {
      problems.push(`service worker assets: invalid table row ${extension}`);
    }
  }

  // A fixture that links the repository's node_modules with a single directory
  // symlink is destructive: pnpm running inside that fixture purges the modules
  // directory it does not recognise, follows the link, and deletes the real
  // dependencies mid-run. `linkFixtureNodeModules` is the only sanctioned form.
  const sources = spawnSync(
    "git",
    ["grep", "-n", "-e", 'symlink(', "--", "scripts", "tests"],
    { encoding: "utf8" },
  );
  if (sources.status === 0) {
    for (const line of sources.stdout.split("\n").filter(Boolean)) {
      if (!line.includes("node_modules")) continue;
      if (line.startsWith("scripts/lib/fixture-node-modules.ts:")) continue;
      problems.push(
        `fixture node_modules: use linkFixtureNodeModules instead — ${line}`,
      );
    }
  }
  const linkedFixtures = spawnSync(
    "git",
    ["grep", "-l", "linkFixtureNodeModules", "--", "scripts", "tests"],
    { encoding: "utf8" },
  );
  if (
    linkedFixtures.status !== 0 ||
    linkedFixtures.stdout.split("\n").filter(Boolean).length < 2
  ) {
    problems.push(
      "fixture node_modules: the shared linker has no callers, so it is not the sanctioned path",
    );
  }

  // TR-RR-05. The shared abort/deadline primitive is only shared if production
  // code imports it. A helper with zero importers is a second implementation
  // waiting to happen, which is exactly how the four hand-written copies of
  // these mechanics diverged in the first place.
  const primitiveImporters = spawnSync(
    "git",
    ["grep", "-l", "platform/abortable-operation.ts", "--", "src"],
    { encoding: "utf8" },
  );
  const importers = (
    primitiveImporters.status === 0 ? primitiveImporters.stdout : ""
  )
    .split("\n")
    .filter(Boolean)
    .filter((file) => !file.endsWith("platform/abortable-operation.ts"));
  if (importers.length === 0) {
    problems.push(
      "abortable-operation: the shared primitive has no production importers",
    );
  }

  if (problems.length > 0) {
    for (const problem of problems) console.error(problem);
    process.exitCode = 1;
    return;
  }
  console.log(
    `Adapter inventory: ${tracked.length} files PASS; ` +
      `service worker asset table: ${
        Object.keys(CACHEABLE_ASSET_CONTENT_TYPES).length
      } shared extensions PASS; ` +
      `fixture node_modules linking PASS`,
  );
}

await main();