import type { FastifyInstance } from 'fastify'
import Fastify from 'fastify'
import cors from '@fastify/cors'
import helmet from '@fastify/helmet'
import rateLimit from '@fastify/rate-limit'
import sensible from '@fastify/sensible'
import formbody from '@fastify/formbody'
import fjwt from '@fastify/jwt'
import fastifyStatic from '@fastify/static'
import { existsSync, mkdirSync } from 'node:fs'
import { dirname, resolve } from 'node:path'
import {
  APP_IDS,
  allPermissionKeys,
} from '@authportal/shared'
import {
  createDb,
  getUserApps,
  healthCheck,
  migrateSchema,
  setUserAccess,
  users,
  type AppDb,
  type Sqlite,
} from '@authportal/db'
import { hash } from '@node-rs/argon2'
import { randomUUID } from 'node:crypto'
import type { AppConfig } from './config.js'
import { authRoutes } from './routes/auth.js'
import { adminRoutes } from './routes/admin.js'
import { auditAdminRoutes } from './routes/audit.js'
import { auditIngestRoutes } from './routes/ingest-audit.js'
import { oidcRoutes } from './routes/oidc.js'
import { startAuditRetentionJob } from './services/audit-retention.js'
import { ensureOidcSigningKey, resetOidcKeyCache } from './lib/oidc/keys.js'

declare module 'fastify' {
  interface FastifyInstance {
    config: AppConfig
    db: AppDb
    sqlite: Sqlite
  }
}

async function ensureBootstrapAdmin(app: FastifyInstance): Promise<void> {
  const existing = app.db.select().from(users).all()
  if (existing.length === 0) {
    const now = new Date().toISOString()
    const passwordHash = await hash(app.config.adminPassword)
    const id = randomUUID()
    app.db
      .insert(users)
      .values({
        id,
        email: app.config.adminEmail.toLowerCase(),
        name: app.config.adminName,
        passwordHash,
        isAdmin: true,
        disabled: false,
        createdAt: now,
        updatedAt: now,
      })
      .run()

    setUserAccess(app.db, id, [...APP_IDS], allPermissionKeys())
    app.log.info(`bootstrap admin created: ${app.config.adminEmail}`)
    return
  }

  // Ensure existing admins have app tiles if access was never set
  for (const user of existing) {
    if (!user.isAdmin) continue
    const apps = getUserApps(app.db, user.id)
    if (apps.length === 0) {
      setUserAccess(app.db, user.id, [...APP_IDS], allPermissionKeys())
      app.log.info(`granted full catalog access to admin ${user.email}`)
    }
  }
}

export async function buildApp(opts: {
  config: AppConfig
  databaseUrl?: string
}): Promise<FastifyInstance> {
  const config = opts.config
  const dbUrl = opts.databaseUrl ?? config.databaseUrl

  const path = dbUrl.replace(/^sqlite:/, '')
  if (path !== ':memory:') {
    mkdirSync(dirname(resolve(path)), { recursive: true })
  }

  const { db, sqlite } = createDb(dbUrl)
  migrateSchema(sqlite)

  const app = Fastify({
    logger: { level: config.logLevel },
    trustProxy: true,
  })

  app.decorate('config', config)
  app.decorate('db', db)
  app.decorate('sqlite', sqlite)

  await app.register(sensible)
  await app.register(formbody)
  await app.register(cors, { origin: true, credentials: true })
  await app.register(helmet, { contentSecurityPolicy: false })
  await app.register(rateLimit, { max: 200, timeWindow: '1 minute' })
  await app.register(fjwt, { secret: config.jwtSecret })

  app.get('/health', async () => {
    healthCheck(sqlite)
    return { ok: true }
  })

  app.get('/ready', async () => {
    healthCheck(sqlite)
    return { ok: true }
  })

  app.get('/api/v1/health', async () => ({ ok: true, service: 'auth-portal' }))

  resetOidcKeyCache()
  await ensureOidcSigningKey(app)
  await ensureBootstrapAdmin(app)
  await app.register(authRoutes)
  await app.register(adminRoutes)
  await app.register(auditAdminRoutes)
  await app.register(auditIngestRoutes)
  await app.register(oidcRoutes)

  if (process.env.NODE_ENV !== 'test') {
    const stopRetention = startAuditRetentionJob(app)
    app.addHook('onClose', async () => {
      stopRetention()
    })
  }

  if (config.staticDir && existsSync(config.staticDir)) {
    await app.register(fastifyStatic, {
      root: resolve(config.staticDir),
      wildcard: false,
    })
    app.setNotFoundHandler((req, reply) => {
      if (req.method === 'GET' && !req.url.startsWith('/api')) {
        return reply.sendFile('index.html')
      }
      return reply
        .status(404)
        .send({ error: { code: 'NOT_FOUND', message: 'Not found' } })
    })
  }

  return app
}