/**
 * GSD Tools Test Helpers
 */

const { execSync, execFileSync } = require('child_process');
const fs = require('fs');
const path = require('path');

const TOOLS_PATH = path.join(__dirname, '..', 'get-shit-done', 'bin', 'gsd-tools.cjs');
const TEST_ENV_BASE = {
  GSD_SESSION_KEY: '',
  CODEX_THREAD_ID: '',
  CLAUDE_SESSION_ID: '',
  CLAUDE_CODE_SSE_PORT: '',
  OPENCODE_SESSION_ID: '',
  GEMINI_SESSION_ID: '',
  CURSOR_SESSION_ID: '',
  WINDSURF_SESSION_ID: '',
  TERM_SESSION_ID: '',
  WT_SESSION: '',
  TMUX_PANE: '',
  ZELLIJ_SESSION_NAME: '',
  TTY: '',
  SSH_TTY: '',
};

/**
 * Run gsd-tools command.
 *
 * @param {string|string[]} args - Command string (shell-interpreted) or array
 *   of arguments (shell-bypassed via execFileSync, safe for JSON and dollar signs).
 * @param {string} cwd - Working directory.
 * @param {object} [env] - Optional env overrides merged on top of process.env.
 *   Pass { HOME: cwd } to sandbox ~/.gsd/ lookups in tests that assert concrete
 *   config values that could be overridden by a developer's defaults.json.
 */
function runGsdTools(args, cwd = process.cwd(), env = {}) {
  try {
    let result;
    const childEnv = { ...process.env, ...TEST_ENV_BASE, ...env };
    if (Array.isArray(args)) {
      result = execFileSync(process.execPath, [TOOLS_PATH, ...args], {
        cwd,
        encoding: 'utf-8',
        stdio: ['pipe', 'pipe', 'pipe'],
        env: childEnv,
      });
    } else {
      // Split shell-style string into argv, stripping surrounding quotes, so we
      // can invoke execFileSync with process.execPath instead of relying on
      // `node` being on PATH (it isn't in Claude Code shell sessions).
      // Apply shell-style quote removal: strip surrounding quotes from quoted
      // sequences anywhere in a token (handles both "foo bar" and --"foo bar").
      const argv = (args.match(/(?:[^\s"']+|"[^"]*"|'[^']*')+/g) || [])
        .map(t => t.replace(/"([^"]*)"/g, '$1').replace(/'([^']*)'/g, '$1'));
      result = execFileSync(process.execPath, [TOOLS_PATH, ...argv], {
        cwd,
        encoding: 'utf-8',
        stdio: ['pipe', 'pipe', 'pipe'],
        env: childEnv,
      });
    }
    return { success: true, output: result.trim() };
  } catch (err) {
    return {
      success: false,
      output: err.stdout?.toString().trim() || '',
      error: err.stderr?.toString().trim() || err.message,
    };
  }
}

// Create a bare temp directory (no .planning/ structure)
function createTempDir(prefix = 'gsd-test-') {
  return fs.mkdtempSync(path.join(require('os').tmpdir(), prefix));
}

// Create temp directory structure
function createTempProject(prefix = 'gsd-test-') {
  const tmpDir = fs.mkdtempSync(path.join(require('os').tmpdir(), prefix));
  fs.mkdirSync(path.join(tmpDir, '.planning', 'phases'), { recursive: true });
  return tmpDir;
}

// Create temp directory with initialized git repo and at least one commit
function createTempGitProject(prefix = 'gsd-test-') {
  const tmpDir = fs.mkdtempSync(path.join(require('os').tmpdir(), prefix));
  fs.mkdirSync(path.join(tmpDir, '.planning', 'phases'), { recursive: true });

  execSync('git init', { cwd: tmpDir, stdio: 'pipe' });
  execSync('git config user.email "test@test.com"', { cwd: tmpDir, stdio: 'pipe' });
  execSync('git config user.name "Test"', { cwd: tmpDir, stdio: 'pipe' });
  execSync('git config commit.gpgsign false', { cwd: tmpDir, stdio: 'pipe' });

  fs.writeFileSync(
    path.join(tmpDir, '.planning', 'PROJECT.md'),
    '# Project\n\nTest project.\n'
  );

  execSync('git add -A', { cwd: tmpDir, stdio: 'pipe' });
  execSync('git commit -m "initial commit"', { cwd: tmpDir, stdio: 'pipe' });

  return tmpDir;
}

function cleanup(tmpDir) {
  fs.rmSync(tmpDir, { recursive: true, force: true });
}

/**
 * Parse a Markdown frontmatter block into a flat key→value map.
 *
 * Handles the YAML scalar forms emitted by the install converters:
 *   key: "json-encoded value"   → JSON.parse
 *   key: 'value with ''escape'' → strip quotes, unescape ''
 *   key: bare value             → trimmed string
 *
 * Multi-line and block scalars are out of scope — every converter in
 * `bin/install.js` emits single-line scalars only. Throws if the content
 * has no closed `---` block so a regression in the emitter shape fails
 * loudly rather than silently returning {}.
 *
 * Tests use this helper instead of `result.includes('key: value')` to
 * follow the project's "tests parse, never grep" convention.
 *
 * @param {string} content - Full file content beginning with `---`.
 * @returns {Record<string, string>} Map of frontmatter keys to decoded values.
 */
function parseFrontmatter(content) {
  if (!content.startsWith('---')) {
    throw new Error(`parseFrontmatter: content must start with '---', got: ${content.slice(0, 40)}`);
  }
  // CRLF tolerance: a Windows-authored file split on `\n` would leave a
  // trailing `\r` on every line, making `lines[i] === '---'` fail to
  // recognize delimiters. Same goes for whitespace-padded delimiter lines.
  // Normalize via a CRLF-aware split + trimmed comparison.
  const lines = content.split(/\r?\n/);
  let openIdx = -1;
  let closeIdx = -1;
  for (let i = 0; i < lines.length; i += 1) {
    if (lines[i].trim() === '---') {
      if (openIdx === -1) openIdx = i;
      else { closeIdx = i; break; }
    }
  }
  if (openIdx === -1 || closeIdx === -1) {
    throw new Error('parseFrontmatter: no closed --- block');
  }
  const fields = {};
  for (const line of lines.slice(openIdx + 1, closeIdx)) {
    const match = line.match(/^([A-Za-z][A-Za-z0-9_-]*):\s*(.*)$/);
    if (!match) continue; // skip block-list items, blank lines, comments
    const [, key, rawValue] = match;
    const value = rawValue.trim();
    if (value.startsWith('"') && value.endsWith('"') && value.length >= 2) {
      fields[key] = JSON.parse(value);
    } else if (value.startsWith("'") && value.endsWith("'") && value.length >= 2) {
      fields[key] = value.slice(1, -1).replace(/''/g, "'");
    } else {
      fields[key] = value;
    }
  }
  return fields;
}

// #3026 CR: shared `--help` output check used by bug-1818 + bug-3019 tests.
// Render-on-help shape is `Usage: gsd-tools …\nCommands: …` — both lines
// must be present; structural test, not prose substring matching.
function isUsageOutput(text) {
  return /Usage:\s*gsd-tools/.test(text) && /Commands:/.test(text);
}

module.exports = { runGsdTools, createTempDir, createTempProject, createTempGitProject, cleanup, parseFrontmatter, isUsageOutput, TOOLS_PATH };