/**
 * DI container — initialise les dependances une seule fois au boot et expose
 * un singleton typed pour les routes. Pour les tests, `setContainer` permet
 * d'injecter un mock complet sans toucher a `getContainer`.
 */

import type { Logger } from 'pino';
import { BaserowClient } from '../adapters/baserow-client.js';
import { RedisCache } from '../adapters/redis-cache.js';
import type { ApiTokenRecord } from '../middleware/auth.js';
import { parseTokens } from '../middleware/auth.js';
import { type RepoSet, TABLE_NAMES, type TableIds, buildRepos } from '../repos/baserow-repo.js';
import type { Config } from './config.js';
import { logger as rootLogger } from './logger.js';

export interface Container {
  config: Config;
  baserow: BaserowClient;
  redis: RedisCache;
  repos: RepoSet;
  tokens: ReadonlyMap<string, ApiTokenRecord>;
  tableIds: TableIds;
  logger: Logger;
}

let _container: Container | null = null;

export function getContainer(): Container {
  if (!_container) {
    throw new Error('Container not initialized — call initContainer() first');
  }
  return _container;
}

export function setContainer(c: Container | null): void {
  _container = c;
}

export interface InitOptions {
  config: Config;
  /** Pour tests : skip le resolveTableIds reseau. */
  tableIds?: TableIds;
  /** Pour tests : injecter une implem de Baserow/Redis. */
  baserow?: BaserowClient;
  redis?: RedisCache;
  databaseId?: number;
}

export async function initContainer(opts: InitOptions): Promise<Container> {
  const { config } = opts;
  const baserow =
    opts.baserow ??
    new BaserowClient({
      baseUrl: config.baserowApiUrl,
      token: config.baserowApiToken,
      logger: rootLogger,
    });
  const redis = opts.redis ?? new RedisCache({ url: config.redisUrl, logger: rootLogger });

  let tableIds: TableIds;
  if (opts.tableIds) {
    tableIds = opts.tableIds;
  } else {
    if (typeof opts.databaseId !== 'number') {
      throw new Error('initContainer: databaseId requis si tableIds non fourni');
    }
    const resolved = await baserow.resolveTableIds(opts.databaseId);
    tableIds = pickTableIds(resolved);
  }

  const repos = buildRepos(baserow, tableIds, rootLogger);
  const tokens = parseTokens(config.bridgeApiTokens);

  const container: Container = {
    config,
    baserow,
    redis,
    repos,
    tokens,
    tableIds,
    logger: rootLogger,
  };
  setContainer(container);
  return container;
}

/** Verifie que toutes les tables attendues sont presentes dans le mapping name->id. */
function pickTableIds(resolved: Record<string, number>): TableIds {
  const out: Partial<TableIds> = {};
  for (const name of TABLE_NAMES) {
    const id = resolved[name];
    if (typeof id !== 'number') {
      throw new Error(`Table Baserow manquante : ${name}`);
    }
    out[name] = id;
  }
  return out as TableIds;
}