import Fastify from 'fastify'
import fastifyStatic from '@fastify/static'
import path from 'node:path'
import { fileURLToPath } from 'node:url'
import { redactInstance } from './core.js'
import { registerStatusRoutes } from './status/routes.js'
import { registerProxyRoutes } from './proxy/routes.js'
import { defaultProxyPolicy } from './proxy/policy.js'
import { ConfirmationStore } from './proxy/confirmations.js'
import { ConfigNotFoundError, ConfigValidationError } from './config/errors.js'
import { isIP } from 'node:net'

const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..')
const FEATURES = ['passwordless-status', 'password-session-login', 'read-write-api-proxy', 'device-sim-network-sms-data-ota-summary', 'iframe-fallback']
const CATALOG = [
  { id: 'overview', name: '总览', endpoints: ['/api/device', '/api/sim', '/api/network', '/api/stats', '/api/connectivity'] },
  { id: 'sms', name: '短信', endpoints: ['/api/sms/stats', '/api/sms/list', '/api/sms/send', '/api/sms/conversation'] },
  { id: 'network', name: '网络/小区', endpoints: ['/api/data', '/api/roaming', '/api/airplane-mode', '/api/radio-mode', '/api/band-lock', '/api/cell-lock', '/api/apn', '/api/cells'] },
  { id: 'device-network', name: '设备网络', endpoints: ['/api/device-network/ddns/status', '/api/device-network/ddns/config', '/api/device-network/wlan/status', '/api/device-network/wlan/profiles'] },
  { id: 'calls', name: '电话', endpoints: ['/api/calls', '/api/call/history', '/api/ims/status', '/api/voicemail/status'] },
  { id: 'esim', name: 'eSIM', endpoints: ['/api/work-mode', '/api/esim/config', '/api/esim/lpac/status', '/api/esim/euicc', '/api/esim/profiles'] },
  { id: 'notify-auto-ota', name: '通知/自动化/升级', endpoints: ['/api/notifications/config', '/api/notifications/logs', '/api/automation/config', '/api/automation/logs', '/api/ota/status'] },
]

export async function buildApp({ configStore, clientRegistry, logger = false, staticFiles = true, publicDir = path.join(ROOT, 'public'), reconcileRetryMs = 100, proxyPolicy = defaultProxyPolicy, confirmationOptions = {} } = {}) {
  if (!configStore || !clientRegistry) throw new TypeError('configStore and clientRegistry are required')
  const app = Fastify({ logger, bodyLimit: 60 * 1024 * 1024 })
  const parseAuthority = raw => {
    const value = String(raw || '').trim().toLowerCase()
    if (!value || /[\s/@]/.test(value)) return null
    let hostname, port = ''
    if (value.startsWith('[')) { const match=value.match(/^\[([^\]]+)\](?::(\d{1,5}))?$/); if(!match)return null; [,hostname,port='']=match }
    else { const match=value.match(/^([^:]+)(?::(\d{1,5}))?$/); if(!match)return null; [,hostname,port='']=match }
    if(port && Number(port)>65535)return null
    return { hostname, port }
  }
  const loopbackAuthority = raw => {
    const authority=parseAuthority(raw); if(!authority)return null
    const {hostname}=authority
    if(hostname === 'localhost') return { ...authority, hostname: 'localhost' }
    if(isIP(hostname) === 6 && (hostname === '::1' || hostname === '0:0:0:0:0:0:0:1')) return { ...authority, hostname: '::1' }
    if(isIP(hostname)!==4)return null
    const octets=hostname.split('.').map(Number)
    return octets[0]===127 ? authority : null
  }
  const configuredRawHost = String(configStore.snapshot.server.host).replace(/^\[|\]$/g, '').toLowerCase()
  const configuredHost = isIP(configuredRawHost) === 6 ? '::1' : configuredRawHost
  const configuredPort = String(configStore.snapshot.server.port)
  app.addHook('onRequest', async (request, reply) => {
    const authority=loopbackAuthority(request.headers.host)
    const injectDefault = request.headers.host === 'localhost:80' && request.raw.socket?.localPort == null
    if (!authority || (!injectDefault && (authority.hostname !== configuredHost || authority.port !== configuredPort))) return reply.code(421).send({ error: 'configured loopback Host required' })
    if (request.headers.origin) {
      let origin
      try { origin = new URL(request.headers.origin) } catch {}
      const originAuthority = origin ? loopbackAuthority(origin.host) : null
      if (!origin || origin.protocol !== 'http:' || !originAuthority || originAuthority.hostname !== authority.hostname || originAuthority.port !== authority.port) return reply.code(403).send({ error: 'cross-origin request rejected' })
    }
  })
  app.addContentTypeParser('application/octet-stream', { parseAs: 'buffer' }, (_request, body, done) => done(null, body))
  app.addContentTypeParser(/^multipart\//, { parseAs: 'buffer' }, (_request, body, done) => done(null, body))
  if (staticFiles) await app.register(fastifyStatic, { root: publicDir, prefix: '/' })
  const findClient = (id, reply) => {
    const client = clientRegistry.get(id)
    if (!client) reply.code(404).send({ error: 'instance not found' })
    return client
  }
  const configError = (reply, error) => reply.code(error instanceof ConfigNotFoundError ? 404 : error instanceof ConfigValidationError ? 400 : 500).send({ error: String(error.message || error) })
  let reconcileError = null
  let retryTimer = null
  const reconcile = () => {
    try { clientRegistry.reconcile(configStore.snapshot.instances); reconcileError = null; return true }
    catch (error) {
      reconcileError = error
      if (!retryTimer) retryTimer = setTimeout(() => { retryTimer = null; reconcile() }, reconcileRetryMs)
      return false
    }
  }
  const committed = async action => {
    const result = await action()
    return { result, reconciled: reconcile() }
  }

  app.get('/api/health', async () => ({ ok: true }))
  app.get('/api/ready', async () => reconcileError ? ({ ready: false, degraded: true, reason: 'registry_reconcile_pending' }) : ({ ready: true }))
  app.get('/api/config', async () => ({ configPath: configStore.configPath, instances: configStore.snapshot.instances.map(redactInstance), features: FEATURES }))
  app.get('/api/instances', async () => ({ instances: configStore.snapshot.instances.map(redactInstance) }))
  app.post('/api/instances', async (request, reply) => {
    try { const { result, reconciled } = await committed(() => configStore.add(request.body || {})); return { instance: redactInstance(result), configPath: configStore.configPath, ...(reconciled ? {} : { reconcilePending: true }) } }
    catch (error) { return configError(reply, error) }
  })
  app.put('/api/instances/:id', async (request, reply) => {
    try { const { result, reconciled } = await committed(() => configStore.update(request.params.id, request.body || {})); return { instance: redactInstance(result), configPath: configStore.configPath, ...(reconciled ? {} : { reconcilePending: true }) } }
    catch (error) { return configError(reply, error) }
  })
  app.delete('/api/instances/:id', async (request, reply) => {
    try { const { result, reconciled } = await committed(() => configStore.delete(request.params.id)); return { removed: redactInstance(result), configPath: configStore.configPath, ...(reconciled ? {} : { reconcilePending: true }) } }
    catch (error) { return configError(reply, error) }
  })
  registerStatusRoutes(app, { registry: clientRegistry, findClient })
  app.post('/api/instances/:id/login', async (request, reply) => {
    const client = findClient(request.params.id, reply); if (!client) return
    const supplied = Object.hasOwn(request.body || {}, 'password')
    return { ...(await client.ensureAuthenticated(supplied ? { credential: request.body.password } : {})), hasSavedPassword: Boolean(configStore.snapshot.instances.find(item => item.id === request.params.id)?.auth?.password) }
  })
  app.post('/api/instances/:id/logout', async (request, reply) => {
    const client = findClient(request.params.id, reply); if (!client) return
    try { await client.fetchJson('/api/auth/logout', { method: 'POST' }) } catch {}
    client.jar.clear(); client.clearEphemeralSecret?.(); return { ok: true }
  })
  registerProxyRoutes(app, { findClient, policy: proxyPolicy, configStore, confirmationStore: new ConfirmationStore(confirmationOptions) })
  app.get('/api/catalog', async () => ({ groups: CATALOG }))
  app.get('/api/reload-note', async () => ({ message: 'Configuration changes are applied immediately.' }))
  app.setNotFoundHandler(async (request, reply) => request.url.startsWith('/api/') ? reply.code(404).send({ error: 'not found' }) : staticFiles ? reply.sendFile('index.html') : reply.code(404).send({ error: 'not found' }))
  app.addHook('onClose', async () => { if (retryTimer) clearTimeout(retryTimer); clientRegistry.close() })
  return app
}