#!/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 { 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/observability-console/baseline-health.md");

export const gates = [
  { id: "typecheck", command: "pnpm", args: ["run", "typecheck"] },
  { id: "lint", command: "pnpm", args: ["run", "lint"] },
  {
    id: "vitest-observability-boundary",
    command: "pnpm",
    args: [
      "exec",
      "vitest",
      "run",
      "apps/api/src/middleware/request-id.test.ts",
      "apps/api/src/middleware/error-envelope.test.ts",
      "apps/worker/src/runtime.test.ts",
      "apps/worker/test/forced-failure.test.ts",
    ],
  },
  {
    id: "console-inventory",
    command: "pnpm",
    args: ["exec", "tsx", "scripts/observability/scan-console.ts", "--check"],
  },
];

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) return parseNumber(failedTestMatch[1]);

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

  return 0;
}

function countConsoleInventoryFailures(output) {
  const inventoryMatch = output.match(/Console inventory matches:\s+(\d+)/i);
  if (inventoryMatch) return parseNumber(inventoryMatch[1]);

  const scanConsoleMatch = output.match(/scan-console:\s+(\d+)\s+hit/i);
  if (scanConsoleMatch) return parseNumber(scanConsoleMatch[1]);

  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-observability-boundary") return countVitestFailures(output);
  if (gateId === "console-inventory") return countConsoleInventoryFailures(output);
  return output.trim() ? 1 : 0;
}

export function gateFailureCount(gateId, stdout, stderr, exitCode) {
  const parsedFailureCount = failureCount(gateId, stdout, stderr);
  return exitCode === 0 ? parsedFailureCount : Math.max(parsedFailureCount, 1);
}

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}`;
      const exitCode = code ?? 1;
      resolve({
        id: gate.id,
        command: shellCommand(gate),
        exitCode,
        durationMs: Date.now() - startedAt,
        failureCount: gateFailureCount(gate.id, stdout, stderr, exitCode),
        fingerprint: outputFingerprint(output),
      });
    });
  });
}

async function runGate(gate) {
  return runShellGate(gate);
}

export function renderReport(results) {
  const lines = [
    "# Observability Console Baseline Health",
    "",
    `Generated: ${new Date().toISOString()}`,
    "",
    "This report captures non-E2E baseline gates for Observability Console 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 writeFailureReport(error) {
  await mkdir(path.dirname(reportPath), { recursive: true });
  const output = error?.stack ?? String(error);
  const result = {
    id: "runner-error",
    command: "node scripts/verify-observability-console-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);
    }
  });
}