import Fastify from 'fastify';
import { readFileSync } from 'node:fs';
import helmet from '@fastify/helmet';
import sensible from '@fastify/sensible';
import swagger from '@fastify/swagger';
import type { AppConfig } from './config.js';
import { Database } from './infrastructure/database.js';
import { newUlid } from './core/ids.js';
import { SERVICE_NAME, SERVICE_VERSION } from './version.js';
import { registerPortalRoutes } from './portal.js';
import { registerSyncRoutes } from './sync.js';
import {
  portalCssEnhanced as portalCss,
  portalHtml,
  portalIcon192,
  portalIcon512,
  portalJsEnhanced as portalJs,
  portalManifest,
  portalServiceWorkerEnhanced as portalServiceWorker,
} from './portal-ui.js';

export interface BuildAppOptions {
  config: AppConfig;
  database?: Database;
}

const apiPrefix = '/api/v1/staff';
const ulidPattern = /^[0-9A-HJKMNP-TV-Z]{26}$/;

export async function buildApp({
  config,
  database = new Database(config.DATABASE_URL),
}: BuildAppOptions) {
  const https = config.HTTPS_PFX_PATH
    ? {
        pfx: readFileSync(config.HTTPS_PFX_PATH),
        passphrase: config.HTTPS_PFX_PASSPHRASE,
        minVersion: 'TLSv1.2' as const,
      }
    : undefined;
  const app = Fastify({
    ...(https ? { https } : {}),
    logger: { level: config.LOG_LEVEL },
    genReqId: (request) => {
      const supplied = request.headers['x-correlation-id']?.toString();
      return supplied && ulidPattern.test(supplied) ? supplied : newUlid();
    },
  });
  await app.register(helmet);
  await app.register(sensible);
  app.addHook('onRequest', async (request, reply) => {
    reply.header('x-correlation-id', request.id);
  });
  await app.register(swagger, {
    openapi: {
      info: { title: 'Krona Staff API', version: SERVICE_VERSION },
      servers: [{ url: apiPrefix }],
    },
  });

  await app.register(
    async (api) => {
      api.get(
        '/live',
        {
          schema: {
            tags: ['Operations'],
            response: {
              200: {
                type: 'object',
                required: ['status'],
                properties: { status: { type: 'string', const: 'ok' } },
              },
            },
          },
        },
        async () => ({ status: 'ok' }),
      );
      api.get(
        '/ready',
        {
          schema: {
            tags: ['Operations'],
            response: {
              200: {
                type: 'object',
                required: ['status'],
                properties: { status: { type: 'string', const: 'ready' } },
              },
              503: {
                type: 'object',
                required: ['status'],
                properties: { status: { type: 'string', const: 'unavailable' } },
              },
            },
          },
        },
        async (_request, reply) => {
          try {
            await database.ping();
            return { status: 'ready' };
          } catch (error) {
            api.log.error({ err: error }, 'readiness dependency check failed');
            return reply.code(503).send({ status: 'unavailable' });
          }
        },
      );
      api.get(
        '/version',
        {
          schema: {
            tags: ['Operations'],
            response: {
              200: {
                type: 'object',
                required: ['name', 'version', 'mode'],
                properties: {
                  name: { type: 'string' },
                  version: { type: 'string' },
                  mode: { type: 'string' },
                },
              },
            },
          },
        },
        async () => ({
          name: SERVICE_NAME,
          version: SERVICE_VERSION,
          mode: config.STAFF_RUNTIME_MODE,
        }),
      );
      api.get('/openapi.json', async () => app.swagger());
      await registerPortalRoutes(api, config, database);
      await registerSyncRoutes(api, config, database);
    },
    { prefix: apiPrefix },
  );
  app.get('/', async (_request, reply) => reply.redirect('/staff'));
  app.get('/staff', async (_request, reply) =>
    reply.type('text/html; charset=utf-8').send(portalHtml),
  );
  app.get('/staff/styles.css', async (_request, reply) =>
    reply.type('text/css; charset=utf-8').send(portalCss),
  );
  app.get('/staff/app.js', async (_request, reply) =>
    reply.type('application/javascript; charset=utf-8').send(portalJs),
  );
  app.get('/staff/sw.js', async (_request, reply) =>
    reply
      .header('service-worker-allowed', '/staff')
      .type('application/javascript; charset=utf-8')
      .send(portalServiceWorker),
  );
  app.get('/staff/manifest.webmanifest', async (_request, reply) =>
    reply.type('application/manifest+json').send(portalManifest),
  );
  app.get('/staff/icon-192.svg', async (_request, reply) =>
    reply.type('image/svg+xml').send(portalIcon192),
  );
  app.get('/staff/icon-512.svg', async (_request, reply) =>
    reply.type('image/svg+xml').send(portalIcon512),
  );
  app.get('/staff/*', async (_request, reply) =>
    reply.type('text/html; charset=utf-8').send(portalHtml),
  );

  app.addHook('onClose', async () => database.close());
  return app;
}