import { createProvider, deleteProvider, getProvider, getProviderByName, updateProvider } from '../db';
import { createRouter } from '../create-router';
import { encrypt } from '../crypto';
import { adapterByName } from '../providers';
import { adapterCatalogue, providerStatuses } from '../providers/credentials';
import { refreshCatalogue } from '../catalogue/refresh';
import { openaiError, UUID_PATTERN } from '../errors';

export const providersRouter = createRouter();

const notFound = (id: string) => openaiError(`No provider with id "${id}".`, 'not_found');

/**
 * Providers are rows; adapters are code.
 *
 * `GET /api/providers` lists what is configured — several may share an adapter, which is the point.
 * `GET /api/providers/adapters` lists what a new one can be built on.
 *
 * No response includes a key, in any form. Not masked either: a mask still leaks length and shape,
 * and nothing needs it. The only questions are whether one is set and where it came from.
 */
providersRouter.get('/', async (ctx) => ctx.json({ data: await providerStatuses() }));

providersRouter.get('/adapters', async (ctx) => ctx.json({ data: await adapterCatalogue() }));

/**
 * Refresh the catalogue now, rather than waiting for the daily pass.
 *
 * Here rather than on a timer alone because the first thing anyone does after adding a key is expect
 * the model list to reflect it — the daily refresh has no key to work with until one exists, so the
 * pass that matters most is the one immediately after.
 */
providersRouter.post('/catalogue/refresh', async (ctx) => {
  const catalogue = await refreshCatalogue();
  return ctx.json({ data: { updated_at: catalogue.updatedAt, providers: catalogue.providers.length } });
});

providersRouter.post('/', async (ctx) => {
  const body = (await ctx.req.json().catch(() => null)) as Record<string, unknown> | null;
  if (!body) return ctx.json(openaiError('Request body must be a JSON object.', 'invalid_request_error'), 400);

  const adapterName = typeof body.adapter === 'string' ? body.adapter : '';
  const adapter = adapterByName(adapterName);
  if (!adapter) {
    return ctx.json(openaiError(`Unknown adapter "${adapterName}".`, 'invalid_request_error', 'adapter'), 400);
  }

  const model = typeof body.model === 'string' && body.model.trim() ? body.model.trim() : adapter.defaultModel;

  // Named after what it is, unless the caller had a better idea. Two providers on one adapter need
  // distinguishable names, and "OpenAI" alone stops being one the moment there are two.
  const name = typeof body.name === 'string' && body.name.trim() ? body.name.trim() : `${adapter.label} · ${model}`;
  if (await getProviderByName(name)) {
    return ctx.json(openaiError(`A provider named "${name}" already exists.`, 'invalid_request_error', 'name'), 409);
  }

  const row = await createProvider({
    name,
    adapter: adapter.name,
    model,
    apiKeyEncrypted: typeof body.apiKey === 'string' && body.apiKey.trim() ? encrypt(body.apiKey.trim()) : null,
    enabled: body.enabled === undefined ? true : Boolean(body.enabled),
    isDefault: Boolean(body.isDefault),
  });

  return ctx.json({ data: await providerStatuses(), created: row.id }, 201);
});

providersRouter.patch('/:id', async (ctx) => {
  const id = ctx.req.param('id');
  if (!UUID_PATTERN.test(id) || !(await getProvider(id))) return ctx.json(notFound(id), 404);

  const body = (await ctx.req.json().catch(() => null)) as Record<string, unknown> | null;
  if (!body) return ctx.json(openaiError('Request body must be a JSON object.', 'invalid_request_error'), 400);

  const values: Record<string, unknown> = {};

  // Undefined means "leave alone" and null means "clear" — the UI sends `enabled` on its own when
  // toggling, and a naive assignment would blank the credential every time someone flipped a switch.
  if (body.apiKey !== undefined) {
    if (body.apiKey === null || body.apiKey === '') values.apiKeyEncrypted = null;
    else if (typeof body.apiKey === 'string') values.apiKeyEncrypted = encrypt(body.apiKey.trim());
    else return ctx.json(openaiError("'apiKey' must be a string or null.", 'invalid_request_error', 'apiKey'), 400);
  }

  if (body.model !== undefined) {
    if (typeof body.model !== 'string' || !body.model.trim()) {
      return ctx.json(openaiError("'model' must be a non-empty string.", 'invalid_request_error', 'model'), 400);
    }
    values.model = body.model.trim();
  }

  if (body.name !== undefined) {
    if (typeof body.name !== 'string' || !body.name.trim()) {
      return ctx.json(openaiError("'name' must be a non-empty string.", 'invalid_request_error', 'name'), 400);
    }
    const clash = await getProviderByName(body.name.trim());
    if (clash && clash.id !== id) {
      return ctx.json(
        openaiError(`A provider named "${body.name.trim()}" already exists.`, 'invalid_request_error', 'name'),
        409,
      );
    }
    values.name = body.name.trim();
  }

  if (body.enabled !== undefined) values.enabled = Boolean(body.enabled);
  if (body.isDefault !== undefined) values.isDefault = Boolean(body.isDefault);

  if (Object.keys(values).length === 0)
    return ctx.json(openaiError('Nothing to update.', 'invalid_request_error'), 400);

  await updateProvider(id, values);
  return ctx.json({ data: await providerStatuses() });
});

/** Removes the configuration. Images it made keep their adapter and model as text and are unaffected. */
providersRouter.delete('/:id', async (ctx) => {
  const id = ctx.req.param('id');
  if (!UUID_PATTERN.test(id) || !(await getProvider(id))) return ctx.json(notFound(id), 404);

  await deleteProvider(id);
  return ctx.json({ data: await providerStatuses() });
});