(() => {
  function parseSkill(text, node) {
    const source = String(text || '').trim();
    const match = source.match(/^---\n([\s\S]*?)\n---\n?([\s\S]*)$/);
    const attributes = {};
    const body = match ? match[2].trim() : source;
    const frontmatter = match ? match[1].split('\n') : [];

    for (const line of frontmatter) {
      const separatorIndex = line.indexOf(':');
      if (separatorIndex === -1) {
        continue;
      }

      const key = line.slice(0, separatorIndex).trim();
      const value = line.slice(separatorIndex + 1).trim();
      if (key) {
        attributes[key] = value;
      }
    }

    if (!attributes.name || !attributes.description) {
      return null;
    }

    return {
      name: attributes.name,
      description: attributes.description,
      default: node.dataset.default === 'true',
      markdown: source,
      body,
    };
  }

  const agentSkills = {
    skills: Object.create(null),

    reload() {
      this.skills = Object.create(null);

      for (const node of document.querySelectorAll('script[type="text/skill+markdown"]')) {
        const skill = parseSkill(node.textContent, node);
        if (skill) {
          this.skills[skill.name] = skill;
        }
      }

      return this.skills;
    },

    list() {
      this.reload();

      return Object.values(this.skills).map(({ name, description, default: isDefault }) => ({
        name,
        description,
        default: isDefault,
      }));
    },

    read(name) {
      this.reload();
      return this.skills[name] || null;
    },

    readDefault() {
      this.reload();
      return Object.values(this.skills).filter((skill) => skill.default);
    },
  };

  window.agentSkills = agentSkills;
  agentSkills.reload();
})();