export function addFileMarker(content, recipe) {
  const marker = `<!-- buildcrew platform=${recipe.platform} type=${recipe.recipeType} name=${recipe.name} -->\n`;

  const lines = content.split('\n');
  if (lines[0]?.trim() === '---') {
    const endIndex = lines.findIndex((line, i) => i > 0 && line.trim() === '---');
    if (endIndex !== -1) {
      return [
        ...lines.slice(0, endIndex + 1),
        marker.trimEnd(),
        ...lines.slice(endIndex + 1)
      ].join('\n');
    }
  }

  return marker + content;
}

export function hasFileMarker(content, recipe) {
  const expected = `<!-- buildcrew platform=${recipe.platform} type=${recipe.recipeType} name=${recipe.name} -->`;
  return content.includes(expected);
}

export function stripFrontmatter(content) {
  const lines = content.split('\n');
  if (lines[0]?.trim() === '---') {
    const endIndex = lines.findIndex((line, i) => i > 0 && line.trim() === '---');
    if (endIndex !== -1) {
      return lines.slice(endIndex + 1).join('\n').trimStart();
    }
  }
  return content;
}

export function wrapSection(content, recipe) {
  const startMarker = `<!-- buildcrew:start platform=${recipe.platform} type=${recipe.recipeType} name=${recipe.name} -->`;
  const endMarker = `<!-- buildcrew:end platform=${recipe.platform} type=${recipe.recipeType} name=${recipe.name} -->`;
  return `${startMarker}\n${content}\n${endMarker}`;
}

export function hasSection(content, recipe) {
  const startMarker = `<!-- buildcrew:start platform=${recipe.platform} type=${recipe.recipeType} name=${recipe.name} -->`;
  return content.includes(startMarker);
}

export function replaceSection(content, recipe, newSection) {
  const startMarker = `<!-- buildcrew:start platform=${recipe.platform} type=${recipe.recipeType} name=${recipe.name} -->`;
  const endMarker = `<!-- buildcrew:end platform=${recipe.platform} type=${recipe.recipeType} name=${recipe.name} -->`;

  const startIndex = content.indexOf(startMarker);
  const endIndex = content.indexOf(endMarker);

  if (startIndex === -1 || endIndex === -1) {
    return content;
  }

  return content.slice(0, startIndex) + newSection + content.slice(endIndex + endMarker.length);
}

export function removeSection(content, recipe) {
  const startMarker = `<!-- buildcrew:start platform=${recipe.platform} type=${recipe.recipeType} name=${recipe.name} -->`;
  const endMarker = `<!-- buildcrew:end platform=${recipe.platform} type=${recipe.recipeType} name=${recipe.name} -->`;

  const startIndex = content.indexOf(startMarker);
  const endIndex = content.indexOf(endMarker);

  if (startIndex === -1 || endIndex === -1) {
    return content;
  }

  let before = content.slice(0, startIndex);
  let after = content.slice(endIndex + endMarker.length);

  // Clean up extra newlines
  before = before.trimEnd();
  after = after.trimStart();

  if (before && after) {
    return before + '\n\n' + after;
  }
  return before + after;
}

/**
 * Parse YAML frontmatter from markdown content.
 * Returns { frontmatter: Object|null, body: string }.
 * Only handles simple key: value pairs (no nested objects, no arrays).
 */
export function parseFrontmatter(content) {
  const lines = content.split('\n');
  if (lines[0]?.trim() !== '---') {
    return { frontmatter: null, body: content };
  }

  const endIndex = lines.findIndex((line, i) => i > 0 && line.trim() === '---');
  if (endIndex === -1) {
    return { frontmatter: null, body: content };
  }

  const frontmatter = {};
  for (let i = 1; i < endIndex; i++) {
    const line = lines[i];
    const colonIndex = line.indexOf(':');
    if (colonIndex > 0) {
      const key = line.slice(0, colonIndex).trim();
      const value = line.slice(colonIndex + 1).trim();
      frontmatter[key] = value;
    }
  }

  const body = lines.slice(endIndex + 1).join('\n').trimStart();
  return { frontmatter, body };
}

/**
 * Serialize a frontmatter object into YAML frontmatter block.
 */
export function stringifyFrontmatter(frontmatter) {
  const lines = ['---'];
  for (const [key, value] of Object.entries(frontmatter)) {
    lines.push(`${key}: ${value}`);
  }
  lines.push('---');
  return lines.join('\n');
}