import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';

import { describe, expect, it } from 'vitest';

const workflow = readFileSync(
  resolve(process.cwd(), '.gitea/workflows/project-ci.yml'),
  'utf8',
);
const imageBuildScript = readFileSync(
  resolve(process.cwd(), 'scripts/gitea-ci-job-image.sh'),
  'utf8',
);
const imageCheckScript = readFileSync(
  resolve(process.cwd(), 'scripts/check-gitea-ci-job-image.sh'),
  'utf8',
);
const npmCiRetryScript = readFileSync(
  resolve(process.cwd(), 'scripts/ci-npm-ci-with-retry.sh'),
  'utf8',
);
const imageDockerfile = readFileSync(
  resolve(process.cwd(), 'deploy/container/gitea-ci-job.Dockerfile'),
  'utf8',
);
const imageDockerignore = readFileSync(
  resolve(
    process.cwd(),
    'deploy/container/gitea-ci-job.Dockerfile.dockerignore',
  ),
  'utf8',
);

const jobNames = [
  'repository-checks',
  'frontend-tests',
  'backend-tests',
  'native-shell-tests',
] as const;

function jobSection(jobName: (typeof jobNames)[number]) {
  const jobStart = workflow.indexOf(`  ${jobName}:`);
  expect(jobStart).toBeGreaterThanOrEqual(0);

  const nextJobOffset = workflow
    .slice(jobStart + 1)
    .search(/^ {2}[a-z][a-z0-9-]+:$/m);
  return workflow.slice(
    jobStart,
    nextJobOffset < 0 ? undefined : jobStart + 1 + nextJobOffset,
  );
}

function stepSection(jobName: (typeof jobNames)[number], stepName: string) {
  const job = jobSection(jobName);
  const stepStart = job.indexOf(`      - name: ${stepName}`);
  expect(stepStart).toBeGreaterThanOrEqual(0);

  const nextStepOffset = job.slice(stepStart + 1).search(/^ {6}- name: /m);
  return job.slice(
    stepStart,
    nextStepOffset < 0 ? undefined : stepStart + 1 + nextStepOffset,
  );
}

function backendStepIndex(stepName: string) {
  const backendJobStart = workflow.indexOf('  backend-tests:');
  const nativeShellJobStart = workflow.indexOf('  native-shell-tests:');
  expect(backendJobStart).toBeGreaterThanOrEqual(0);
  expect(nativeShellJobStart).toBeGreaterThan(backendJobStart);

  return workflow
    .slice(backendJobStart, nativeShellJobStart)
    .indexOf(`      - name: ${stepName}`);
}

describe('project CI workflow', () => {
  it('keeps every job on the isolated preinstalled CI image boundary', () => {
    expect(workflow.match(/^ {4}runs-on: genarrative-ci$/gm)).toHaveLength(4);
    expect(workflow).not.toContain('actions/checkout');
    expect(workflow).not.toContain('actions/setup-node');
    expect(workflow).not.toMatch(/^\s+run: .*\b(?:apt|rustup)\b/m);

    for (const jobName of jobNames) {
      const job = jobSection(jobName);
      const checkout = job.indexOf('genarrative-gitea-checkout');
      const validateImage = job.indexOf(
        'GENARRATIVE_GITEA_CI_CHECK_RUNTIME=1 bash scripts/check-gitea-ci-job-image.sh',
      );
      const installDependencies = job.indexOf(
        '- name: Install npm dependencies',
      );

      expect(checkout).toBeGreaterThanOrEqual(0);
      expect(validateImage).toBeGreaterThan(checkout);
      expect(installDependencies).toBeGreaterThan(validateImage);
    }

    expect(imageDockerfile).toMatch(
      /^ARG RUST_IMAGE=[^\s]+@sha256:[a-f0-9]{64}$/m,
    );
    expect(imageDockerfile).toMatch(
      /^ARG RUNNER_IMAGE=[^\s]+@sha256:[a-f0-9]{64}$/m,
    );
  });

  it('retries every root and AI game creator npm clean install as a bounded whole command', () => {
    for (const jobName of jobNames) {
      const install = stepSection(jobName, 'Install npm dependencies');
      expect(install).toContain('bash scripts/ci-npm-ci-with-retry.sh');
      expect(install).not.toContain('--prefix');
    }

    for (const jobName of ['frontend-tests', 'native-shell-tests'] as const) {
      const install = stepSection(
        jobName,
        'Install AI game creator dependencies',
      );
      expect(install).toContain(
        'bash scripts/ci-npm-ci-with-retry.sh --prefix apps/ai-game-creator-shell',
      );
    }

    expect(npmCiRetryScript).toContain(
      'max_attempts="${GENARRATIVE_CI_NPM_CI_ATTEMPTS:-3}"',
    );
    expect(npmCiRetryScript).toContain(
      'base_delay_seconds="${GENARRATIVE_CI_NPM_CI_RETRY_DELAY_SECONDS:-5}"',
    );
    expect(npmCiRetryScript).toContain(
      'for attempt in $(seq 1 "${max_attempts}"); do',
    );
    expect(npmCiRetryScript).toContain('if npm ci "$@"; then');
    expect(npmCiRetryScript).toContain(
      'if [[ "${attempt}" -eq "${max_attempts}" ]]; then',
    );
  });

  it('builds and verifies image caches against both AI game creator locks', () => {
    const npmManifest = 'apps/ai-game-creator-shell/package.json';
    const npmLock = 'apps/ai-game-creator-shell/package-lock.json';
    const rustManifest = 'apps/ai-game-creator-shell/src-tauri/Cargo.toml';
    const rustLock = 'apps/ai-game-creator-shell/src-tauri/Cargo.lock';

    for (const [path, expectedCount] of [
      [npmManifest, 2],
      [npmLock, 3],
      [rustManifest, 2],
      [rustLock, 3],
    ] as const) {
      expect(imageBuildScript.split(path)).toHaveLength(expectedCount + 1);
      expect(imageDockerignore).toContain(`!${path}`);
    }

    expect(imageBuildScript).toContain(
      '--build-arg "AGC_NPM_LOCK_SHA256=${agc_npm_lock_sha256}"',
    );
    expect(imageBuildScript).toContain(
      '--build-arg "AGC_RUST_LOCK_SHA256=${agc_rust_lock_sha256}"',
    );
    expect(imageDockerfile).toContain('ARG AGC_NPM_LOCK_SHA256');
    expect(imageDockerfile).toContain('ARG AGC_RUST_LOCK_SHA256');
    expect(imageDockerfile).toContain(
      '--prefix /usr/local/share/genarrative-ci/agc-npm',
    );
    expect(
      imageDockerfile.match(
        /--manifest-path \/tmp\/genarrative-cargo-cache\/apps\/ai-game-creator-shell\/src-tauri\/Cargo\.toml/g,
      ),
    ).toHaveLength(1);
    expect(imageDockerfile).toContain(
      'cargo_fetch_with_retry /tmp/genarrative-cargo-cache/apps/ai-game-creator-shell/src-tauri/Cargo.toml',
    );
    expect(imageDockerfile).toContain(
      'GENARRATIVE_GITEA_CI_AGC_NPM_LOCK_SHA256=${AGC_NPM_LOCK_SHA256}',
    );
    expect(imageDockerfile).toContain(
      'GENARRATIVE_GITEA_CI_AGC_RUST_LOCK_SHA256=${AGC_RUST_LOCK_SHA256}',
    );

    expect(imageCheckScript).toContain(npmLock);
    expect(imageCheckScript).toContain(rustLock);
    expect(imageCheckScript).toContain(
      '${GENARRATIVE_GITEA_CI_AGC_NPM_LOCK_SHA256:-}',
    );
    expect(imageCheckScript).toContain(
      '${GENARRATIVE_GITEA_CI_AGC_RUST_LOCK_SHA256:-}',
    );
    expect(imageCheckScript).toContain(
      '::warning title=CI dependency cache is partial::',
    );
  });

  it('prepares locked server-rs dependencies before the first Cargo build gate', () => {
    const prepareDependencies = backendStepIndex(
      'Prepare server-rs Rust dependencies',
    );
    const checkBoundaries = backendStepIndex('Check server-rs boundaries');
    const runWorkspaceTests = backendStepIndex('Run server-rs workspace tests');

    expect(prepareDependencies).toBeGreaterThanOrEqual(0);
    expect(checkBoundaries).toBeGreaterThan(prepareDependencies);
    expect(runWorkspaceTests).toBeGreaterThan(checkBoundaries);
    expect(workflow).toContain('cargo fetch --locked');
    expect(workflow).toContain('for attempt in $(seq 1 5); do');
  });
});