import test from "node:test";
import assert from "node:assert/strict";
import fs from "node:fs";
import path from "node:path";

test("Docker Configuration: Dockerfile enforces Node runtime, healthcheck, and entrypoint", () => {
  const dockerfilePath = path.resolve(process.cwd(), "Dockerfile");
  assert.ok(fs.existsSync(dockerfilePath), "Dockerfile must exist");

  const content = fs.readFileSync(dockerfilePath, "utf-8");

  // Must use Node 22 alpine
  assert.match(content, /FROM\s+node:22-alpine/i, "Dockerfile must use node:22-alpine base image");

  // Must NOT contain nginx base images or references
  assert.doesNotMatch(content, /FROM\s+nginx/i, "Dockerfile must not use nginx base image");
  assert.doesNotMatch(content, /nginx/i, "Dockerfile must not contain nginx directives");

  // Must build static site and configure dynamic port
  assert.match(content, /RUN\s+npm\s+run\s+build/, "Dockerfile must compile baseline static assets");
  assert.match(content, /ARG\s+PORT=8080/, "Dockerfile must define ARG PORT with default fallback");
  assert.match(content, /ENV\s+PORT=\$\{?PORT\}?/, "Dockerfile must define ENV PORT using variable");
  assert.match(content, /EXPOSE\s+\$\{?PORT\}?/, "Dockerfile must expose dynamic PORT variable");

  // Must define built-in HEALTHCHECK probing 127.0.0.1 loopback
  assert.match(content, /HEALTHCHECK[\s\S]*?127\.0\.0\.1/, "Dockerfile must define baked-in HEALTHCHECK on 127.0.0.1");

  // Must configure dynamic entrypoint script
  assert.match(content, /ENTRYPOINT\s*\[\s*["']\/app\/entrypoint\.sh["']\s*\]/, "Dockerfile must use /app/entrypoint.sh entrypoint");
});

test("Docker Configuration: entrypoint.sh script exists and has valid structure", () => {
  const entrypointPath = path.resolve(process.cwd(), "entrypoint.sh");
  assert.ok(fs.existsSync(entrypointPath), "entrypoint.sh must exist");

  const stats = fs.statSync(entrypointPath);
  // Check executable permissions (at least owner executable: 0o100)
  assert.ok(Boolean(stats.mode & 0o111), "entrypoint.sh must have executable permission bits");

  const content = fs.readFileSync(entrypointPath, "utf-8");
  assert.match(content, /^#!\/bin\/sh/, "entrypoint.sh must use POSIX /bin/sh shebang");
  assert.match(content, /exec\s+"\$@"/, "entrypoint.sh must pass through custom container arguments");
  assert.match(content, /npm\s+run\s+build/, "entrypoint.sh must build the static site");
  assert.match(content, /exec\s+node\s+server\.js/, "entrypoint.sh must start static server with exec");
});

test("Docker Configuration: docker-compose configures Node service correctly", () => {
  const composePath = fs.existsSync(path.resolve(process.cwd(), "sample-docker-compose.yml"))
    ? path.resolve(process.cwd(), "sample-docker-compose.yml")
    : path.resolve(process.cwd(), "docker-compose.yml");
  assert.ok(fs.existsSync(composePath), "Compose template file must exist");

  const content = fs.readFileSync(composePath, "utf-8");

  // Verifies dynamic port mapping and environment variables
  assert.match(content, /PORT.*8080/, "docker-compose.yml must configure PORT fallback");
  assert.match(content, /:\$\{PORT:-8080\}/, "docker-compose.yml must map dynamic container PORT");

  // Verifies domain argument enforcement
  assert.match(content, /SITE_DOMAIN/, "docker-compose.yml must require SITE_DOMAIN");

  // Verifies markdown volume mount
  assert.match(content, /\/app\/src\/posts/, "docker-compose.yml must mount external markdown posts");
});