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

const __dirname = path.dirname(fileURLToPath(import.meta.url));
export const repoRoot = path.resolve(__dirname, "..");

export const buildCommand = { command: "pnpm", args: ["run", "build"] };
export const runtimeScanRoots = ["package.json", "apps", "packages", "scripts", "Dockerfile"];
export const excludedRuntimePrefixes = ["packages/plugins/"];

export const ignoredDirectoryNames = new Set([
  ".git",
  ".cache",
  ".next",
  ".react-router",
  ".tc",
  ".turbo",
  ".vite",
  "build",
  "cache",
  "coverage",
  "dist",
  "generated",
  "node_modules",
  "tmp",
  "temp",
  "vendor",
]);

export const ignoredFileNames = new Set([
  "package-lock.json",
  "pnpm-lock.yaml",
  "yarn.lock",
]);

export const sourceFileExtensions = new Set([
  ".json",
  ".js",
  ".jsx",
  ".mjs",
  ".cjs",
  ".ts",
  ".tsx",
]);

const forbiddenPatterns = [
  { id: "toolctrl-plugins-package", pattern: /(?:^|["'`\s])@toolctrl\/plugins(?:["'`\s/]|$)/ },
  { id: "packages-plugins-path", pattern: /(?:^|["'`\s./])packages\/plugins(?:["'`\s/]|$)/ },
];

function isAllowedPluginMetadataReference(relativeFilePath, line) {
  const normalized = normalizeRelativePath(relativeFilePath);
  if (normalized === "Dockerfile" && line.trim() === "COPY packages/plugins/package.json packages/plugins/package.json") {
    return true;
  }
  return normalized === "scripts/coverage-targets.json";
}

function toRelativePath(root, absolutePath) {
  return path.relative(root, absolutePath).split(path.sep).join("/");
}

function normalizeRelativePath(relativePath) {
  return relativePath.split(path.sep).join("/").replace(/^\.\//, "");
}

export function isIgnoredDirectory(name, relativePath = name) {
  const normalized = normalizeRelativePath(relativePath);
  return ignoredDirectoryNames.has(name) || ignoredDirectoryNames.has(normalized) || name.endsWith(".cache") || normalized.includes("/__generated__/");
}

export function isGeneratedOrIgnoredFile(filePath) {
  const name = path.basename(filePath);
  return (
    ignoredFileNames.has(name) ||
    name.endsWith(".generated.ts") ||
    name.endsWith(".generated.tsx") ||
    name.endsWith(".gen.ts") ||
    name.endsWith(".gen.tsx") ||
    name.endsWith(".min.js") ||
    name.endsWith(".map") ||
    name.endsWith(".d.ts")
  );
}

export function isSourceFile(filePath) {
  return path.basename(filePath) === "Dockerfile" || sourceFileExtensions.has(path.extname(filePath));
}

export function isTestFile(filePath) {
  const normalized = normalizeRelativePath(filePath);
  const name = path.basename(normalized);
  return (
    /(?:^|[./_-])(?:test|spec|stories|story)\.[cm]?[jt]sx?$/.test(name) ||
    /\.(?:test|spec|stories|story)\.[cm]?[jt]sx?$/.test(name) ||
    normalized.includes("/__tests__/") ||
    normalized.includes("/test/") ||
    normalized.includes("/tests/") ||
    normalized.includes("/fixtures/") ||
    normalized.includes("/mocks/") ||
    normalized.includes("/__mocks__/")
  );
}

export function isExcludedRuntimePath(relativePath) {
  const normalized = normalizeRelativePath(relativePath);
  return excludedRuntimePrefixes.some((prefix) => normalized === prefix.slice(0, -1) || normalized.startsWith(prefix));
}

async function pathExists(root, relativePath) {
  try {
    await stat(path.join(root, relativePath));
    return true;
  } catch (error) {
    if (error?.code === "ENOENT") return false;
    throw error;
  }
}

export async function collectSourceFiles(root = repoRoot, scanRoots = runtimeScanRoots) {
  const files = [];
  const roots = [];
  const missingRoots = [];

  async function walk(directory) {
    const entries = await readdir(directory, { withFileTypes: true });
    for (const entry of entries) {
      const absolutePath = path.join(directory, entry.name);
      const relativePath = toRelativePath(root, absolutePath);
      if (entry.isDirectory()) {
        if (isIgnoredDirectory(entry.name, relativePath) || isExcludedRuntimePath(relativePath)) continue;
        await walk(absolutePath);
        continue;
      }
      if (!entry.isFile()) continue;
      if (relativePath === "scripts/verify-core-build-without-plugins-smoke.mjs") continue;
      if (relativePath === "scripts/scan-removed-modules.ts") continue;
      if (!isSourceFile(entry.name) || isGeneratedOrIgnoredFile(entry.name)) continue;
      if (isExcludedRuntimePath(relativePath) || isTestFile(relativePath)) continue;
      files.push(absolutePath);
    }
  }

  for (const scanRoot of scanRoots) {
    const normalizedRoot = normalizeRelativePath(scanRoot);
    if (!(await pathExists(root, normalizedRoot))) {
      missingRoots.push(normalizedRoot);
      continue;
    }
    roots.push(normalizedRoot);
    const absoluteRoot = path.join(root, normalizedRoot);
    const rootStat = await stat(absoluteRoot);
    if (rootStat.isFile()) {
      if (isSourceFile(absoluteRoot) && !isGeneratedOrIgnoredFile(absoluteRoot) && !isTestFile(normalizedRoot) && !isExcludedRuntimePath(normalizedRoot)) {
        files.push(absoluteRoot);
      }
      continue;
    }
    await walk(absoluteRoot);
  }

  files.sort((a, b) => toRelativePath(root, a).localeCompare(toRelativePath(root, b)));
  return { roots, missingRoots, files };
}

export function findForbiddenPluginImports(sourceText, relativeFilePath) {
  const diagnostics = [];
  const lines = sourceText.split(/\r?\n/);
  lines.forEach((line, index) => {
    for (const { id, pattern } of forbiddenPatterns) {
      pattern.lastIndex = 0;
      if (!pattern.test(line)) continue;
      if (isAllowedPluginMetadataReference(relativeFilePath, line)) continue;
      diagnostics.push({ file: normalizeRelativePath(relativeFilePath), line: index + 1, id, text: line.trim() });
    }
  });
  return diagnostics;
}

export async function scanForbiddenPluginImports(root = repoRoot, scanRoots = runtimeScanRoots) {
  const collection = await collectSourceFiles(root, scanRoots);
  const diagnostics = [];
  for (const file of collection.files) {
    const relativeFilePath = toRelativePath(root, file);
    const sourceText = await readFile(file, "utf8");
    diagnostics.push(...findForbiddenPluginImports(sourceText, relativeFilePath));
  }
  return { ...collection, diagnostics };
}

function excerptOutput(output, maxLength = 2400) {
  const normalized = output.trim();
  if (!normalized) return "(no output)";
  if (normalized.length <= maxLength) return normalized;
  return `${normalized.slice(0, maxLength)}\n... output truncated ...`;
}

export function runBuild(root = repoRoot) {
  return new Promise((resolve) => {
    const startedAt = Date.now();
    const child = spawn(buildCommand.command, buildCommand.args, { cwd: root, 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${error.message}`;
    });
    child.on("close", (code) => {
      resolve({
        command: [buildCommand.command, ...buildCommand.args].join(" "),
        exitCode: code ?? 1,
        durationMs: Date.now() - startedAt,
        stdout,
        stderr,
        outputExcerpt: excerptOutput(`${stdout}\n${stderr}`),
      });
    });
  });
}

export function renderSmokeReport({ buildResult, scanResult }) {
  const diagnostics = scanResult.diagnostics ?? [];
  const lines = [
    "Feature Manifest Core Build Without Plugins Smoke",
    `Build Command: ${buildResult.command}`,
    `Build Exit Code: ${buildResult.exitCode}`,
    `Build Duration Ms: ${buildResult.durationMs}`,
    `Scanned Roots: ${scanResult.roots.join(", ") || "(none)"}`,
    `Missing Roots Skipped: ${scanResult.missingRoots.join(", ") || "(none)"}`,
    `Scanned File Count: ${scanResult.files.length}`,
    `Forbidden Import Count: ${diagnostics.length}`,
  ];

  if (buildResult.exitCode !== 0) {
    lines.push("Build Output Excerpt:", buildResult.outputExcerpt);
  }

  lines.push("Forbidden Import Diagnostics:");
  if (diagnostics.length === 0) {
    lines.push("(none)");
  } else {
    for (const diagnostic of diagnostics.slice(0, 20)) {
      lines.push(`${diagnostic.file}:${diagnostic.line}: [${diagnostic.id}] ${diagnostic.text}`);
    }
    if (diagnostics.length > 20) lines.push(`... ${diagnostics.length - 20} additional forbidden imports omitted`);
  }

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

export async function runSmoke(root = repoRoot) {
  const buildResult = await runBuild(root);
  const scanResult = await scanForbiddenPluginImports(root, runtimeScanRoots);
  return { buildResult, scanResult, report: renderSmokeReport({ buildResult, scanResult }) };
}

async function main() {
  const result = await runSmoke(repoRoot);
  process.stdout.write(result.report);
  if (result.buildResult.exitCode !== 0) {
    process.exitCode = result.buildResult.exitCode;
    return;
  }
  process.exitCode = result.scanResult.diagnostics.length > 0 ? 1 : 0;
}

if (process.argv[1] === fileURLToPath(import.meta.url)) {
  main().catch((error) => {
    console.error(error?.stack ?? error);
    process.exitCode = 1;
  });
}