const assert = require("assert");
const fs = require("fs");
const path = require("path");

const CRITERION_HEADING =
  /^## \*\*(Passed|Partial|Open):\*\* (P3-[A-Z]+-\d{3}):/gm;

function readPhase3Ledger(repo) {
  return fs.readFileSync(path.join(repo, "phase_3_acceptance_criteria.md"), "utf8");
}

function criterionStatuses(source) {
  return [...source.matchAll(CRITERION_HEADING)].map((match) => ({
    status: match[1],
    id: match[2],
  }));
}

function statusCounts(criteria) {
  return Object.fromEntries(
    ["Passed", "Partial", "Open"].map((status) => [
      status,
      criteria.filter((criterion) => criterion.status === status).length,
    ])
  );
}

function assertCompleteCriterionSet(criteria) {
  assert.strictEqual(criteria.length, 191, "Phase 3 ledger must contain 191 criteria");
  assert.strictEqual(
    new Set(criteria.map((criterion) => criterion.id)).size,
    191,
    "Phase 3 criterion ids must be unique"
  );
}

function assertPreFinalLedger(source) {
  const criteria = criterionStatuses(source);
  assertCompleteCriterionSet(criteria);
  const counts = statusCounts(criteria);
  assert.deepStrictEqual(
    counts,
    { Passed: 0, Partial: 181, Open: 10 },
    "the public-release E2E requires the independently reset 181 Partial / 10 Open ledger"
  );
  const expectedOpen = Array.from(
    { length: 10 },
    (_, index) => `P3-GATE-${String(index + 1).padStart(3, "0")}`
  );
  assert.deepStrictEqual(
    criteria
      .filter((criterion) => criterion.status === "Open")
      .map((criterion) => criterion.id),
    expectedOpen,
    "only the ten final P3-GATE criteria may be Open in the reset ledger"
  );
  return counts;
}

function assertFinalLedger(source) {
  const criteria = criterionStatuses(source);
  assertCompleteCriterionSet(criteria);
  const counts = statusCounts(criteria);
  assert.deepStrictEqual(
    counts,
    { Passed: 191, Partial: 0, Open: 0 },
    "final release evidence requires all 191 Phase 3 criteria to be Passed"
  );
  return counts;
}

function assertPreFinalOrFinalLedger(source) {
  const criteria = criterionStatuses(source);
  assertCompleteCriterionSet(criteria);
  const counts = statusCounts(criteria);
  if (counts.Open === 10) {
    return assertPreFinalLedger(source);
  }
  return assertFinalLedger(source);
}

module.exports = {
  assertFinalLedger,
  assertPreFinalLedger,
  assertPreFinalOrFinalLedger,
  criterionStatuses,
  readPhase3Ledger,
  statusCounts,
};