export const GITEA_TOKEN = process.env.GITEA_TOKEN || '';
export const GITEA_SERVER_URL = process.env.GITEA_SERVER_URL || 'https://gitea.com';
export const GITEA_REPOSITORY = process.env.GITEA_REPOSITORY || '';
export const GITEA_SKIP_TLS_VERIFY = process.env.GITEA_SKIP_TLS_VERIFY === 'true';
export const PR_NUMBER = process.env.PR_NUMBER || '';
export const PR_HEAD_SHA = process.env.PR_HEAD_SHA || '';
export const PR_HEAD_BRANCH = process.env.PR_HEAD_BRANCH || '';
export const PR_BASE_BRANCH = process.env.PR_BASE_BRANCH || '';

export const FINDINGS_PATH = '.gitea/ai-review/findings.json';
export const EXCLUSIONS_PATH = '.gitea/ai-review/exclusions.json';

/** 將逗號分隔的 API key 字串拆成陣列 */
function splitKeys(value) {
  if (!value) return [];
  return value.split(',').map(k => k.trim()).filter(Boolean);
}

export function getLLMConfig() {
  const checks = [
    ['openai',   splitKeys(process.env.OPENAI_API_KEY),   process.env.OPENAI_BASE_URL || 'https://api.openai.com/v1',   process.env.OPENAI_MODEL || 'gpt-4o-mini'],
    ['claude',   splitKeys(process.env.CLAUDE_API_KEY),   process.env.CLAUDE_BASE_URL || 'https://api.anthropic.com/v1', process.env.CLAUDE_MODEL || 'claude-3-haiku-20240307'],
    ['gemini',   splitKeys(process.env.GEMINI_API_KEY),   process.env.GEMINI_BASE_URL || 'https://generativelanguage.googleapis.com/v1beta', process.env.GEMINI_MODEL || 'gemini-2.5-flash'],
    ['ollama',   ['ollama'],                               process.env.OLLAMA_BASE_URL,  process.env.OLLAMA_MODEL],
    ['amazonq',  splitKeys(process.env.AMAZONQ_API_KEY),  process.env.AMAZONQ_BASE_URL  || 'https://q.api.aws',              process.env.AMAZONQ_MODEL  || 'amazon-q'],
  ];
  for (const [provider, apiKeys, baseURL, model] of checks) {
    if (apiKeys.length > 0 && baseURL) return { provider, apiKeys, baseURL, model };
  }
  return { provider: null, apiKeys: [], baseURL: null, model: null };
}