#!/usr/bin/env node
/* eslint-disable no-console */
import { createHash } from "node:crypto";
import { mkdir, readdir, readFile, writeFile } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { markFailedBaselineGates } from "./baseline-gate-exit.mjs";
import { spawn } from "node:child_process";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const repoRoot = path.resolve(__dirname, "..");
export const reportPath = path.join(repoRoot, ".tc/baselines/billing-boundary/baseline-health.md");

const billingInventoryPatterns = [
  { id: "plan-equality", pattern: /\bplan\s*===/g },
  { id: "trial-days", pattern: /\btrialDays\b/g },
  { id: "trial-free-autosubscribe", pattern: /\bautosubscribeToTrialOrFreePlan\b/g },
  { id: "stripe-price-product-lookup", pattern: /\b(?:stripePriceId|stripeProductId|getSubscriptionPriceByStripeId|getSubscriptionProductByStripeId|price\.stripeId|product\.stripeId|stripe\.prices|stripe\.products)\b/g },
  { id: "direct-subscription-model-access", pattern: /\bdb\.(?:subscriptionProduct|subscriptionPrice|subscriptionFeature|subscriptionUsageBasedPrice|subscriptionUsageBasedTier|tenantSubscription|tenantSubscriptionProduct|tenantSubscriptionProductPrice|tenantSubscriptionUsageRecord|checkoutSessionStatus)\b/g },
];

export const gates = [
  { id: "typecheck", command: "pnpm", args: ["run", "typecheck"] },
  { id: "lint", command: "pnpm", args: ["run", "lint"] },
  {
    id: "vitest-billing-boundary",
    command: "pnpm",
    args: [
      "exec",
      "vitest",
      "run",
      "packages/db/src/subscriptions.server.test.ts",
      "packages/db/src/subscriptions-boundary.test.ts",
      "apps/web/app/utils/services/.server/subscriptionService.test.ts",
    ],
  },
  { id: "billing-inventory", type: "billing-inventory" },
];

function shellCommand(gate) {
  if (gate.type === "billing-inventory") return "read-only billing inventory";
  return [gate.command, ...gate.args].join(" ");
}

function outputFingerprint(output) {
  const normalized = output
    .split(/\r?\n/)
    .map((line) => line.trim())
    .filter(Boolean)
    .slice(-40)
    .join("\n");
  const hash = createHash("sha256").update(output).digest("hex").slice(0, 12);
  return {
    hash,
    excerpt: normalized.slice(0, 1200) || "(no output)",
  };
}

function parseNumber(value) {
  const parsed = Number.parseInt(value, 10);
  return Number.isFinite(parsed) ? parsed : 0;
}

function countTypeScriptFailures(output) {
  return (output.match(/error TS\d+/g) ?? []).length;
}

function countEslintFailures(output) {
  const problemsMatch = output.match(/✖\s+(\d+)\s+problems?\s+\((\d+)\s+errors?/i);
  if (problemsMatch) return parseNumber(problemsMatch[2]);

  const compactMatch = output.match(/(\d+)\s+errors?/i);
  if (compactMatch) return parseNumber(compactMatch[1]);

  return 0;
}

function countVitestFailures(output) {
  const failedTestMatch = output.match(/Tests\s+(\d+)\s+failed/i);
  if (failedTestMatch) return parseNumber(failedTestMatch[1]);

  const failedFilesMatch = output.match(/Test Files\s+(\d+)\s+failed/i);
  if (failedFilesMatch) return parseNumber(failedFilesMatch[1]);

  return 0;
}

function conservativeFailureCount(count, output) {
  return count > 0 ? count : output.trim() ? 1 : 0;
}

export function failureCount(gateId, stdout, stderr, exitCode = 1) {
  if (exitCode === 0) return 0;

  const output = `${stdout}\n${stderr}`;
  if (gateId === "typecheck") return conservativeFailureCount(countTypeScriptFailures(output), output);
  if (gateId === "lint") return conservativeFailureCount(countEslintFailures(output), output);
  if (gateId === "vitest-billing-boundary") return conservativeFailureCount(countVitestFailures(output), output);
  if (gateId === "billing-inventory") return 0;
  return output.trim() ? 1 : 0;
}

function runShellGate(gate) {
  return new Promise((resolve) => {
    const startedAt = Date.now();
    const child = spawn(gate.command, gate.args, {
      cwd: repoRoot,
      env: { ...process.env, CI: "1" },
      shell: false,
    });

    let stdout = "";
    let stderr = "";
    child.stdout.on("data", (chunk) => {
      stdout += chunk;
    });
    child.stderr.on("data", (chunk) => {
      stderr += chunk;
    });
    child.on("error", (error) => {
      stderr += `\n${error.message}`;
    });
    child.on("close", (code) => {
      const output = `${stdout}\n${stderr}`;
      resolve({
        id: gate.id,
        command: shellCommand(gate),
        exitCode: code ?? 1,
        durationMs: Date.now() - startedAt,
        failureCount: failureCount(gate.id, stdout, stderr, code ?? 1),
        fingerprint: outputFingerprint(output),
      });
    });
  });
}

async function collectFiles(rootRelativePath) {
  const absoluteRoot = path.join(repoRoot, rootRelativePath);
  const files = [];
  async function walk(directory) {
    const entries = await readdir(directory, { withFileTypes: true });
    for (const entry of entries) {
      if (entry.name === "node_modules" || entry.name === "build" || entry.name === "dist" || entry.name === "coverage") continue;
      const absolutePath = path.join(directory, entry.name);
      if (entry.isDirectory()) {
        await walk(absolutePath);
        continue;
      }
      if (!entry.isFile() || !/\.(?:ts|tsx|js|jsx|mjs|cjs|prisma)$/.test(entry.name)) continue;
      files.push(absolutePath);
    }
  }
  await walk(absoluteRoot);
  return files;
}

async function runBillingInventoryGate(gate) {
  const startedAt = Date.now();
  const scanRoots = ["apps/web/app", "packages/db/src"];
  const files = [
    ...(await collectFiles(scanRoots[0])),
    ...(await collectFiles(scanRoots[1])),
    path.join(repoRoot, "prisma/schema/subscriptions.prisma"),
  ];
  const counts = new Map(billingInventoryPatterns.map(({ id }) => [id, 0]));
  const matches = [];

  for (const file of files) {
    const relativeFile = path.relative(repoRoot, file).split(path.sep).join("/");
    const source = await readFile(file, "utf8");
    const lines = source.split(/\r?\n/);
    lines.forEach((line, index) => {
      for (const { id, pattern } of billingInventoryPatterns) {
        pattern.lastIndex = 0;
        const found = line.match(pattern);
        if (!found) continue;
        counts.set(id, (counts.get(id) ?? 0) + found.length);
        matches.push(`${relativeFile}:${index + 1}: [${id}] ${line.trim()}`);
      }
    });
  }

  const outputLines = [
    `Billing inventory scanned roots: ${scanRoots.join(", ")}, prisma/schema/subscriptions.prisma`,
    ...Array.from(counts.entries()).map(([id, count]) => `${id}: ${count}`),
    `total matches: ${matches.length}`,
    ...matches.slice(0, 240),
  ];
  if (matches.length > 240) outputLines.push(`... ${matches.length - 240} additional matches omitted`);
  const output = outputLines.join("\n");

  return {
    id: gate.id,
    command: shellCommand(gate),
    exitCode: 0,
    durationMs: Date.now() - startedAt,
    failureCount: 0,
    fingerprint: outputFingerprint(output),
  };
}

async function runGate(gate) {
  if (gate.type === "billing-inventory") return runBillingInventoryGate(gate);
  return runShellGate(gate);
}

export function renderReport(results) {
  const lines = [
    "# Billing Boundary Baseline Health",
    "",
    `Generated: ${new Date().toISOString()}`,
    "",
    "This report captures non-E2E baseline gates for Billing Boundary baseline. The runner exits 0 when every gate was executed and this report was written, even if individual gates fail.",
    "The billing inventory gate is read-only and fingerprints known plan, trial, Stripe lookup, and direct subscription model access hot spots without failing on legacy findings.",
    "",
  ];

  for (const result of results) {
    lines.push(
      `## ${result.id}`,
      "",
      `- Command: \`${result.command}\``,
      `- Exitcode: ${result.exitCode}`,
      `- Failure Count: ${result.failureCount}`,
      `- Duration: ${result.durationMs}ms`,
      `- Output Fingerprint: ${result.fingerprint.hash}`,
      "",
      "```text",
      result.fingerprint.excerpt,
      "```",
      "",
    );
  }

  return `${lines.join("\n")}\n`;
}

async function writeFailureReport(error) {
  await mkdir(path.dirname(reportPath), { recursive: true });
  const output = error?.stack ?? String(error);
  const result = {
    id: "runner-error",
    command: "node scripts/verify-billing-boundary-baseline.mjs",
    exitCode: 1,
    durationMs: 0,
    failureCount: 1,
    fingerprint: outputFingerprint(output),
  };
  await writeFile(reportPath, renderReport([result]), "utf8");
}

async function main() {
  const results = [];
  for (const gate of gates) {
    console.log(`Running ${gate.id}: ${shellCommand(gate)}`);
    results.push(await runGate(gate));
  }

  await mkdir(path.dirname(reportPath), { recursive: true });
  await writeFile(reportPath, renderReport(results), "utf8");
  console.log(`Wrote ${path.relative(repoRoot, reportPath)}`);
  markFailedBaselineGates(results);
}

if (process.argv[1] === fileURLToPath(import.meta.url)) {
  main().catch(async (error) => {
    console.error(error);
    try {
      await writeFailureReport(error);
    } finally {
      process.exit(1);
    }
  });
}