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

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const repoRoot = path.resolve(__dirname, "..");
const reportPath = path.join(repoRoot, ".tc/baselines/api-auth-surface/baseline-health.md");
const authCentralResolverFile = "apps/web/app/utils/services/apiService.ts";

export const gates = [
  { id: "typecheck", command: "pnpm", args: ["run", "typecheck"] },
  { id: "lint", command: "pnpm", args: ["run", "lint"] },
  { id: "vitest-app", command: "pnpm", args: ["exec", "vitest", "run", "apps/web/app/"] },
  { id: "api-auth-surface", command: "node", args: ["scripts/verify-api-auth-surface.mjs", "--json"] },
];

function shellCommand({ command, args }) {
  return [command, ...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, 900) || "(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) {
    const countMatch = failedTestMatch[0].match(/Tests\s+(\d+)\s+failed/i);
    return countMatch ? parseNumber(countMatch[1]) : 1;
  }

  const failedFilesMatch = output.match(/Test Files\s+(\d+)\s+failed/i);
  return failedFilesMatch ? parseNumber(failedFilesMatch[1]) : 0;
}

function countAuthSurfaceFailures(stdout, output) {
  try {
    const inventory = JSON.parse(stdout);
    return (inventory.directValidateApiKeyCallsites ?? []).filter((entry) => entry.file !== authCentralResolverFile).length;
  } catch {
    return output.trim() ? 1 : 0;
  }
}

export function failureCount(gateId, stdout, stderr) {
  const output = `${stdout}\n${stderr}`;
  if (gateId === "typecheck") return countTypeScriptFailures(output);
  if (gateId === "lint") return countEslintFailures(output);
  if (gateId === "vitest-app") return countVitestFailures(output);
  if (gateId === "api-auth-surface") return countAuthSurfaceFailures(stdout, output);
  return 0;
}

function runGate(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),
        fingerprint: outputFingerprint(output),
      });
    });
  });
}

export function renderReport(results) {
  const lines = [
    "# API Auth Surface Baseline Health",
    "",
    `Generated: ${new Date().toISOString()}`,
    "",
    "This report captures non-E2E baseline gates for API Auth Surface baseline. The runner exits 0 when every gate was executed and this report was written, even if individual gates fail.",
    "",
  ];

  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 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)}`);
}

if (process.argv[1] === fileURLToPath(import.meta.url)) {
  main().catch(async (error) => {
    console.error(error);
    try {
      await mkdir(path.dirname(reportPath), { recursive: true });
      await writeFile(reportPath, `# API Auth Surface Baseline Health\n\nRunner failed before report completion.\n\n\`\`\`text\n${error?.stack ?? error}\n\`\`\`\n`, "utf8");
    } finally {
      process.exit(1);
    }
  });
}