import { createDbPool } from '../db.mjs';
import { decryptSecret } from '../llm-providers.mjs';

function isDashScopeProviderRow(row) {
  if (!row) return false;
  const providerId = String(row.provider_id ?? '').trim();
  const apiUrl = String(row.api_url ?? '').trim().toLowerCase();
  if (providerId === 'custom_qwen') return true;
  return apiUrl.includes('dashscope.aliyuncs.com');
}

function normalizeBaseUrl(apiUrl) {
  const raw = String(apiUrl ?? '').trim().replace(/\/$/, '');
  if (!raw) return 'https://dashscope.aliyuncs.com/compatible-mode/v1';
  if (raw.endsWith('/embeddings')) return raw.slice(0, -'/embeddings'.length);
  return raw;
}

/**
 * Resolve DashScope / Qwen embedding credentials from memind_adm-managed
 * `h5_llm_provider_keys`, the same store used by Providers in memind_adm.
 */
export async function resolveLlmEmbeddingCredentials({
  pool = null,
  keyId = null,
  env = process.env,
} = {}) {
  const ownsPool = !pool;
  const db = pool ?? createDbPool();
  try {
    const explicitKeyId = String(keyId ?? env.MEMIND_EMBEDDING_LLM_KEY_ID ?? '').trim();
    let row = null;
    if (explicitKeyId) {
      const [rows] = await db.query(
        'SELECT * FROM h5_llm_provider_keys WHERE id = ? AND status = ? LIMIT 1',
        [explicitKeyId, 'active'],
      );
      row = rows[0] ?? null;
    } else {
      const [selectedRows] = await db.query(
        'SELECT * FROM h5_llm_provider_keys WHERE is_selected = 1 AND status = ? LIMIT 1',
        ['active'],
      );
      if (isDashScopeProviderRow(selectedRows[0])) {
        row = selectedRows[0];
      }
      if (!row) {
        const [dashRows] = await db.query(
          `SELECT * FROM h5_llm_provider_keys
           WHERE status = ?
             AND (
               provider_id = 'custom_qwen'
               OR api_url LIKE '%dashscope.aliyuncs.com%'
             )
           ORDER BY is_selected DESC, updated_at DESC
           LIMIT 1`,
          ['active'],
        );
        row = dashRows[0] ?? null;
      }
    }

    if (!row) {
      return { available: false, reason: 'dashscope_llm_key_not_found' };
    }
    if (!isDashScopeProviderRow(row)) {
      return { available: false, reason: 'llm_key_not_dashscope', providerId: row.provider_id };
    }

    const apiKey = decryptSecret(
      {
        ciphertext: row.api_key_ciphertext,
        iv: row.api_key_iv,
        tag: row.api_key_tag,
      },
      env.H5_SETTINGS_ENCRYPTION_KEY ?? env.TKMIND_SERVER__SECRET_KEY,
    );
    if (!apiKey) {
      return { available: false, reason: 'dashscope_api_key_decrypt_failed', keyName: row.name };
    }

    return {
      available: true,
      provider: 'dashscope',
      keyId: row.id,
      keyName: row.name,
      providerId: row.provider_id,
      apiKey,
      baseUrl: normalizeBaseUrl(row.api_url),
      chatModel: row.default_model,
      model: String(env.MEMIND_EMBEDDING_MODEL ?? 'text-embedding-v3').trim(),
    };
  } finally {
    if (ownsPool) await db.end();
  }
}