import { getSecret } from 'officerdb/secret-store';
import { getProvider, getProviderByName, listProviders, resolveProviderForModel } from '../db';
import type { Provider } from '../db';
import { decrypt } from '../crypto';
import { ADAPTERS, adapterByName } from './index';
import type { ImageAdapter } from './types';

/**
 * The key for a provider: its own, then the adapter's bootstrap credential.
 *
 * That order because the row is where the owner put a key deliberately. The bootstrap credential is
 * how a key gets in before there is a UI to put one in, and how an install supplies one without a
 * database write. Several providers sharing an adapter therefore also share the fallback, which is
 * right: it is the same account.
 */
export async function keyForProvider(provider: Provider): Promise<string | undefined> {
  if (provider.apiKeyEncrypted) {
    try {
      return decrypt(provider.apiKeyEncrypted);
    } catch (error) {
      // A key that will not decrypt is broken, not absent. Falling through to the bootstrap credential
      // would hide that the stored credential is unusable.
      console.error(`[atelier:providers] stored key for "${provider.name}" failed to decrypt:`, error);
      return undefined;
    }
  }

  return bootstrapKeyFor(provider.adapter);
}

/**
 * The adapter's bootstrap credential — the secret store first, `.env` second.
 *
 * `getSecret`, never `getKey`: this is a foreign credential (OpenAI's, not ours), and `getKey` mints a
 * random value for an absent purpose — for a foreign credential that means silently authenticating
 * with a fake. `putSecret`/`getSecret` landed 2026-08-19; `bun run secret:set atelier-openai-key`
 * writes it. Falls back to `<ADAPTER>_API_KEY` in `.env` so an install that predates the secret store
 * keeps working unchanged.
 *
 * Keyed per-adapter (`atelier-<adapter>-key`), matching `envVarFor`'s own per-adapter shape below —
 * several providers on one adapter already share one fallback, and this preserves that.
 */
function bootstrapKeyFor(adapter: string): string | undefined {
  try {
    const stored = getSecret(`atelier-${adapter}-key`);
    if (stored) return stored;
  } catch {
    // Unreadable store — fall through to env, same as every other secret-store caller in this codebase.
  }
  return process.env[envVarFor(adapter)];
}

/** `openai` -> `OPENAI_API_KEY`. Per adapter, not per provider: it is one account. */
export const envVarFor = (adapter: string) => `${adapter.toUpperCase().replace(/[^A-Z0-9]/g, '_')}_API_KEY`;

export type ResolvedProvider = { provider: Provider; adapter: ImageAdapter; apiKey: string };

/** Everything needed to run a generation, or a reason it cannot run. */
export async function resolveForRequest(options: {
  providerRef?: string;
  model?: string;
}): Promise<ResolvedProvider | { error: string; status: 400 | 404 | 503 }> {
  let provider: Provider | undefined;

  if (options.providerRef) {
    // Named explicitly — a uuid or the provider's name. An unknown one is the caller's mistake and
    // must not silently fall back to a different provider that will bill them.
    provider = /^[0-9a-f-]{36}$/i.test(options.providerRef)
      ? await getProvider(options.providerRef)
      : await getProviderByName(options.providerRef);

    if (!provider) return { error: `No provider named "${options.providerRef}".`, status: 404 };
    if (!provider.enabled) return { error: `Provider "${provider.name}" is disabled.`, status: 503 };
  } else {
    provider = await resolveProviderForModel(options.model);
    if (!provider) {
      return { error: 'No provider is configured. Add one in Settings → Integrations → Atelier.', status: 503 };
    }
  }

  const adapter = adapterByName(provider.adapter);
  if (!adapter)
    return { error: `Provider "${provider.name}" uses unknown adapter "${provider.adapter}".`, status: 400 };

  const apiKey = await keyForProvider(provider);
  if (!apiKey) return { error: `Provider "${provider.name}" has no API key.`, status: 503 };

  return { provider, adapter, apiKey };
}

/** What the providers screen renders. Never includes a key, in any form. */
export async function providerStatuses() {
  const rows = await listProviders();

  return Promise.all(
    rows.map(async (row) => ({
      id: row.id,
      name: row.name,
      adapter: row.adapter,
      model: row.model,
      enabled: row.enabled,
      is_default: row.isDefault,
      configured: Boolean(await keyForProvider(row)),
      // Where the key came from, so the UI can say "set as a bootstrap credential" rather than showing
      // an empty field next to a provider that works.
      key_source: row.apiKeyEncrypted
        ? ('database' as const)
        : (await keyForProvider(row))
          ? ('environment' as const)
          : null,
      env_var: envVarFor(row.adapter),
      created_at: row.createdAt,
      updated_at: row.updatedAt,
    })),
  );
}

/** The adapters a provider can be built on, for the "add provider" form. */
export const adapterCatalogue = () =>
  ADAPTERS.map((adapter) => ({
    name: adapter.name,
    label: adapter.label,
    models: adapter.models,
    default_model: adapter.defaultModel,
    env_var: envVarFor(adapter.name),
    supports_edit: typeof adapter.edit === 'function',
  }));