/**
 * Windows Robustness Tests
 *
 * Validates that workflow files, hooks, and core functions handle
 * Windows/cross-platform edge cases correctly:
 *
 * 1. Workflow shell robustness: informational commands guarded with || true
 * 2. Glob loops guarded with [ -e "$var" ] || continue
 * 3. Hook stdin timeout patterns present in all JS hooks
 * 4. findProjectRoot detects .git at same level as .planning/
 * 5. @file: handoff present in all workflows that call init
 *
 * Regression tests for: https://github.com/gsd-build/get-shit-done/issues/1343
 */

const { test, describe } = require('node:test');
const assert = require('node:assert');
const fs = require('fs');
const path = require('path');

const WORKFLOWS_DIR = path.join(__dirname, '..', 'get-shit-done', 'workflows');
const HOOKS_DIR = path.join(__dirname, '..', 'hooks');

/**
 * Extract bash code blocks from a markdown file.
 * Returns array of { lineNumber, code } objects.
 */
function extractBashBlocks(content) {
  const blocks = [];
  const lines = content.split('\n');
  let inBlock = false;
  let blockStart = 0;
  let blockLines = [];

  for (let i = 0; i < lines.length; i++) {
    const line = lines[i];
    if (line.trim().startsWith('```bash')) {
      inBlock = true;
      blockStart = i + 1;
      blockLines = [];
    } else if (inBlock && line.trim() === '```') {
      inBlock = false;
      blocks.push({ lineNumber: blockStart, code: blockLines.join('\n') });
    } else if (inBlock) {
      blockLines.push(line);
    }
  }
  return blocks;
}

/**
 * Check if a line is an informational command that can return non-zero on
 * "no results" and should be guarded with || true.
 *
 * Matches: ls, grep, find, cat on optional files — commands at end of line
 * with 2>/dev/null that are NOT already guarded.
 */
function findUnguardedInfoCommands(code) {
  const issues = [];
  const lines = code.split('\n');

  for (let i = 0; i < lines.length; i++) {
    const line = lines[i].trim();

    // Skip comments, empty lines, and lines that are already guarded
    if (!line || line.startsWith('#')) continue;
    if (line.includes('|| true') || line.includes('|| echo') || line.includes('|| continue')) continue;

    // Lines ending with 2>/dev/null that use informational commands
    if (line.endsWith('2>/dev/null')) {
      // Check if this is an informational command (ls, grep, find, cat on optional files)
      if (/^(ls|grep|find|cat)\s/.test(line) ||
          /\|\s*(ls|grep|find)\s/.test(line)) {
        issues.push({ line: i + 1, content: line });
      }
    }
  }
  return issues;
}

// ─── Workflow Shell Robustness ────────────────────────────────────────────────

describe('workflow shell robustness', () => {
  const workflowFiles = fs.readdirSync(WORKFLOWS_DIR)
    .filter(f => f.endsWith('.md'));

  // Key workflow files that must have || true guards on informational commands
  const criticalWorkflows = [
    'resume-project.md',
    'progress.md',
    'transition.md',
    'verify-phase.md',
    'verify-work.md',
    'discuss-phase.md',
    'plan-phase.md',
    'execute-plan.md',
    'cleanup.md',
  ];

  for (const wf of criticalWorkflows) {
    test(`${wf}: informational commands are guarded with || true`, () => {
      const filePath = path.join(WORKFLOWS_DIR, wf);
      if (!fs.existsSync(filePath)) return; // skip if workflow doesn't exist
      const content = fs.readFileSync(filePath, 'utf-8');
      const blocks = extractBashBlocks(content);
      const allIssues = [];

      for (const block of blocks) {
        const issues = findUnguardedInfoCommands(block.code);
        for (const issue of issues) {
          allIssues.push(`Line ~${block.lineNumber + issue.line}: ${issue.content}`);
        }
      }

      assert.strictEqual(
        allIssues.length, 0,
        `${wf} has unguarded informational commands that may fail on Windows:\n  ${allIssues.join('\n  ')}`
      );
    });
  }

  test('glob loops in resume-project.md have existence guard', () => {
    const content = fs.readFileSync(path.join(WORKFLOWS_DIR, 'resume-project.md'), 'utf-8');
    const blocks = extractBashBlocks(content);

    for (const block of blocks) {
      // Look for `for ... in .planning/` glob loops
      const forLoopMatch = block.code.match(/for\s+\w+\s+in\s+\.planning\/[^;]+;\s*do/);
      if (forLoopMatch) {
        // The loop body should contain [ -e "$var" ] || continue
        assert.ok(
          block.code.includes('|| continue'),
          `Glob loop at line ~${block.lineNumber} missing existence guard ([ -e "$var" ] || continue):\n${forLoopMatch[0]}`
        );
      }
    }
  });
});

// ─── Hook Stdin Timeout ──────────────────────────────────────────────────────

describe('hook stdin timeout patterns', () => {
  test('all JS hooks have stdin timeout guard', () => {
    if (!fs.existsSync(HOOKS_DIR)) return;

    const hookFiles = fs.readdirSync(HOOKS_DIR)
      .filter(f => f.endsWith('.js'));

    for (const hook of hookFiles) {
      const content = fs.readFileSync(path.join(HOOKS_DIR, hook), 'utf-8');

      // Hooks that read stdin must have a timeout
      if (content.includes('process.stdin')) {
        assert.ok(
          content.includes('setTimeout') || content.includes('stdinTimeout'),
          `${hook} reads stdin but lacks a timeout guard — will hang on Windows if stdin pipe doesn't close`
        );
      }
    }
  });

  test('no JS hooks use synchronous readFileSync on /dev/stdin', () => {
    if (!fs.existsSync(HOOKS_DIR)) return;

    const hookFiles = fs.readdirSync(HOOKS_DIR)
      .filter(f => f.endsWith('.js'));

    for (const hook of hookFiles) {
      const content = fs.readFileSync(path.join(HOOKS_DIR, hook), 'utf-8');
      assert.ok(
        !content.includes("readFileSync('/dev/stdin')") &&
        !content.includes('readFileSync("/dev/stdin")'),
        `${hook} uses readFileSync('/dev/stdin') which hangs on Windows — use async process.stdin with timeout instead`
      );
    }
  });
});

// ─── @file: Handoff ─────────────────────────────────────────────────────────

describe('@file: handoff in workflows', () => {
  test('all workflows calling gsd-tools init have @file: handler', () => {
    const workflowFiles = fs.readdirSync(WORKFLOWS_DIR)
      .filter(f => f.endsWith('.md'));

    const missing = [];
    for (const wf of workflowFiles) {
      const content = fs.readFileSync(path.join(WORKFLOWS_DIR, wf), 'utf-8');

      // Check if this workflow calls gsd-tools.cjs init
      if (/INIT=\$\(node.*gsd-tools.*\binit\b/.test(content)) {
        // Must have @file: handler
        if (!content.includes('@file:')) {
          missing.push(wf);
        }
      }
    }

    assert.strictEqual(
      missing.length, 0,
      `Workflows calling gsd-tools init without @file: handler (large output will be truncated):\n  ${missing.join('\n  ')}`
    );
  });
});