#!/usr/bin/env node
import assert from "node:assert/strict";
import { access, readdir, readFile } from "node:fs/promises";
import { constants as fsConstants } from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const reportsDir = path.join(repoRoot, "reports/dev-gate");

const requiredIssue = "pikasTech/HWLAB#31";
const requiredValidationCommands = [
  "node --check scripts/validate-dev-gate-report.mjs",
  "node scripts/validate-dev-gate-report.mjs"
];
const requiredSmokeCommand = "node scripts/m1-contract-smoke.mjs";
const requiredDryRunCommand =
  "node tools/hwlab-cli/bin/hwlab-cli.mjs test e2e --env dev --mvp --dry-run";
const requiredDocs = [
  "docs/dev-acceptance-matrix.md",
  "docs/m0-contract-audit.md"
];

const statusValues = new Set(["pass", "blocked", "not_run", "not_applicable", "failed"]);
const blockerTypes = new Set([
  "contract_blocker",
  "environment_blocker",
  "network_blocker",
  "runtime_blocker",
  "agent_blocker",
  "observability_blocker",
  "safety_blocker"
]);
const blockerStates = new Set(["open", "acknowledged", "closed"]);

function assertObject(value, label) {
  assert.ok(value && typeof value === "object" && !Array.isArray(value), `${label} must be an object`);
}

function assertString(value, label) {
  assert.equal(typeof value, "string", `${label} must be a string`);
  assert.ok(value.trim().length > 0, `${label} must not be empty`);
  assert.ok(!value.includes("\n"), `${label} must be a single line`);
}

function assertArray(value, label) {
  assert.ok(Array.isArray(value), `${label} must be an array`);
}

function assertStatus(value, label) {
  assertString(value, label);
  assert.ok(statusValues.has(value), `${label} must be one of ${Array.from(statusValues).join(", ")}`);
}

function assertRepoRelativePath(value, label) {
  assertString(value, label);
  assert.ok(!path.isAbsolute(value), `${label} must be repo-relative`);
  assert.ok(!value.startsWith(".."), `${label} must stay inside the repository`);

  const absolutePath = path.resolve(repoRoot, value);
  assert.ok(
    absolutePath.startsWith(`${repoRoot}${path.sep}`),
    `${label} must stay inside the repository`
  );

  return absolutePath;
}

function assertStringArray(value, label, { minLength = 0 } = {}) {
  assertArray(value, label);
  assert.ok(value.length >= minLength, `${label} must contain at least ${minLength} item(s)`);
  for (const [index, item] of value.entries()) {
    assertString(item, `${label}[${index}]`);
  }
}

function assertUnique(values, label) {
  assert.equal(new Set(values).size, values.length, `${label} must be unique`);
}

async function readJsonFile(relativePath) {
  const raw = await readFile(path.join(repoRoot, relativePath), "utf8");
  return JSON.parse(raw);
}

async function collectReportFiles() {
  const entries = await readdir(reportsDir, { withFileTypes: true });
  return entries
    .filter((entry) => entry.isFile() && entry.name.endsWith(".json"))
    .map((entry) => path.join("reports/dev-gate", entry.name))
    .sort();
}

async function validateReport(relativePath) {
  const report = await readJsonFile(relativePath);
  const label = relativePath;

  assertObject(report, label);
  for (const field of [
    "$schema",
    "$id",
    "reportVersion",
    "issue",
    "taskId",
    "commitId",
    "acceptanceLevel",
    "devOnly",
    "prodDisabled",
    "sourceContract",
    "validationCommands",
    "localSmoke",
    "dryRun",
    "devPreconditions",
    "blockers"
  ]) {
    assert.ok(Object.hasOwn(report, field), `${label} missing ${field}`);
  }

  assertString(report.$schema, `${label}.$schema`);
  assertString(report.$id, `${label}.$id`);
  assert.equal(report.reportVersion, "v1", `${label}.reportVersion`);
  assert.equal(report.issue, requiredIssue, `${label}.issue`);
  assert.match(report.taskId, /^[a-z][a-z0-9-]*$/, `${label}.taskId`);
  assert.match(report.commitId, /^[a-f0-9]{7,40}$/, `${label}.commitId`);
  assert.match(report.acceptanceLevel, /^[a-z][a-z0-9_-]*$/, `${label}.acceptanceLevel`);
  assert.equal(report.devOnly, true, `${label}.devOnly`);
  assert.equal(report.prodDisabled, true, `${label}.prodDisabled`);

  assertObject(report.sourceContract, `${label}.sourceContract`);
  assertStatus(report.sourceContract.status, `${label}.sourceContract.status`);
  assertString(report.sourceContract.summary, `${label}.sourceContract.summary`);
  assertStringArray(report.sourceContract.documents, `${label}.sourceContract.documents`, {
    minLength: requiredDocs.length
  });

  const documents = new Set(report.sourceContract.documents);
  assertUnique(report.sourceContract.documents, `${label}.sourceContract.documents`);
  for (const requiredDoc of requiredDocs) {
    assert.ok(documents.has(requiredDoc), `${label}.sourceContract.documents missing ${requiredDoc}`);
  }
  for (const [index, documentPath] of report.sourceContract.documents.entries()) {
    const absolutePath = assertRepoRelativePath(
      documentPath,
      `${label}.sourceContract.documents[${index}]`
    );
    await access(absolutePath, fsConstants.R_OK);
  }

  assertStringArray(report.validationCommands, `${label}.validationCommands`, { minLength: 2 });
  assertUnique(report.validationCommands, `${label}.validationCommands`);
  for (const requiredCommand of requiredValidationCommands) {
    assert.ok(
      report.validationCommands.includes(requiredCommand),
      `${label}.validationCommands missing ${requiredCommand}`
    );
  }

  assertObject(report.localSmoke, `${label}.localSmoke`);
  assertStatus(report.localSmoke.status, `${label}.localSmoke.status`);
  assertStringArray(report.localSmoke.commands, `${label}.localSmoke.commands`, { minLength: 1 });
  assertUnique(report.localSmoke.commands, `${label}.localSmoke.commands`);
  assert.ok(
    report.localSmoke.commands.includes(requiredSmokeCommand),
    `${label}.localSmoke.commands missing ${requiredSmokeCommand}`
  );
  assertStringArray(report.localSmoke.evidence, `${label}.localSmoke.evidence`, { minLength: 1 });
  assertString(report.localSmoke.summary, `${label}.localSmoke.summary`);

  assertObject(report.dryRun, `${label}.dryRun`);
  assertStatus(report.dryRun.status, `${label}.dryRun.status`);
  assertStringArray(report.dryRun.commands, `${label}.dryRun.commands`, { minLength: 1 });
  assertUnique(report.dryRun.commands, `${label}.dryRun.commands`);
  assert.ok(
    report.dryRun.commands.includes(requiredDryRunCommand),
    `${label}.dryRun.commands missing ${requiredDryRunCommand}`
  );
  assertStringArray(report.dryRun.evidence, `${label}.dryRun.evidence`, { minLength: 1 });
  assertString(report.dryRun.summary, `${label}.dryRun.summary`);

  assertObject(report.devPreconditions, `${label}.devPreconditions`);
  assertStatus(report.devPreconditions.status, `${label}.devPreconditions.status`);
  assertStringArray(report.devPreconditions.requirements, `${label}.devPreconditions.requirements`, {
    minLength: 1
  });
  assertString(report.devPreconditions.summary, `${label}.devPreconditions.summary`);

  assertArray(report.blockers, `${label}.blockers`);
  assertUnique(
    report.blockers.map((blocker) => `${blocker.type}::${blocker.scope}`),
    `${label}.blockers`
  );
  for (const [index, blocker] of report.blockers.entries()) {
    const blockerLabel = `${label}.blockers[${index}]`;
    assertObject(blocker, blockerLabel);
    for (const field of ["type", "scope", "status", "summary"]) {
      assert.ok(Object.hasOwn(blocker, field), `${blockerLabel} missing ${field}`);
    }
    assert.ok(blockerTypes.has(blocker.type), `${blockerLabel}.type must be a known blocker type`);
    assertString(blocker.scope, `${blockerLabel}.scope`);
    assert.ok(blockerStates.has(blocker.status), `${blockerLabel}.status must be open, acknowledged, or closed`);
    assertString(blocker.summary, `${blockerLabel}.summary`);
  }

  if (Object.hasOwn(report, "notes")) {
    assertString(report.notes, `${label}.notes`);
  }
}

async function main() {
  const reportFiles = await collectReportFiles();
  assert.ok(reportFiles.length >= 1, "expected at least one dev-gate report JSON file");

  for (const reportFile of reportFiles) {
    await validateReport(reportFile);
  }

  console.log(`validated ${reportFiles.length} dev-gate report JSON file(s)`);
}

await main();