import { describe, expect, it } from 'vitest'
import { mkdtempSync, rmSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { jwtVerify, createLocalJWKSet } from 'jose'
import { buildApp } from '../src/app.js'
import { loadConfig } from '../src/config.js'
import { resetOidcKeyCache } from '../src/lib/oidc/keys.js'

async function buildTestApp() {
  resetOidcKeyCache()
  const config = loadConfig({
    ...process.env,
    JWT_SECRET: 'test-secret-at-least-8',
    ADMIN_EMAIL: 'admin@test.local',
    ADMIN_PASSWORD: 'adminpass',
    DATABASE_URL: 'sqlite::memory:',
    ISSUER: 'https://auth.test.local',
    OIDC_ISSUER: 'https://auth.test.local',
    NODE_ENV: 'test',
  })
  return buildApp({ config, databaseUrl: 'sqlite::memory:' })
}

describe('OIDC IdP', () => {
  it('serves discovery and JWKS', async () => {
    const app = await buildTestApp()
    const discovery = await app.inject({
      method: 'GET',
      url: '/.well-known/openid-configuration',
    })
    expect(discovery.statusCode).toBe(200)
    const meta = discovery.json() as {
      issuer: string
      authorization_endpoint: string
      jwks_uri: string
    }
    expect(meta.issuer).toBe('https://auth.test.local')
    expect(meta.authorization_endpoint).toContain('/oauth/authorize')
    expect(meta.jwks_uri).toContain('/.well-known/jwks.json')

    const jwks = await app.inject({
      method: 'GET',
      url: '/.well-known/jwks.json',
    })
    expect(jwks.statusCode).toBe(200)
    const keys = jwks.json() as { keys: { kid: string; kty: string }[] }
    expect(keys.keys.length).toBeGreaterThan(0)
    expect(keys.keys[0]?.kty).toBe('RSA')
    await app.close()
  })

  it('records auth.sso_handoff with target_app dns on authorize', async () => {
    const app = await buildTestApp()

    const login = await app.inject({
      method: 'POST',
      url: '/api/v1/auth/login',
      payload: { email: 'admin@test.local', password: 'adminpass' },
    })
    expect(login.statusCode).toBe(200)
    const token = (login.json() as { access_token: string }).access_token
    const refresh = login.cookies.find((c) => c.name === 'refresh_token')
    expect(refresh?.value).toBeTruthy()

    const created = await app.inject({
      method: 'POST',
      url: '/api/v1/admin/oidc/clients',
      headers: { authorization: `Bearer ${token}` },
      payload: {
        name: 'Technitium',
        redirect_uris: ['https://dns.test.local/sso/callback'],
        scopes: ['openid', 'profile', 'email', 'groups'],
        enabled: true,
      },
    })
    const client = created.json() as { client_id: string }

    const authorize = await app.inject({
      method: 'GET',
      url: '/oauth/authorize',
      cookies: { refresh_token: refresh!.value },
      query: {
        client_id: client.client_id,
        redirect_uri: 'https://dns.test.local/sso/callback',
        response_type: 'code',
        scope: 'openid profile email groups',
        state: 'xyz',
      },
    })
    expect(authorize.statusCode).toBe(302)

    const audit = await app.inject({
      method: 'GET',
      url: '/api/v1/admin/audit?kind=logins&limit=50',
      headers: { authorization: `Bearer ${token}` },
    })
    expect(audit.statusCode).toBe(200)
    const entries = audit.json() as {
      action: string
      details: Record<string, unknown> | null
    }[]
    const handoff = entries.find(
      (e) =>
        e.action === 'auth.sso_handoff' &&
        e.details?.target_app === 'dns' &&
        e.details?.auth_mode === 'oidc',
    )
    expect(handoff).toBeTruthy()
    await app.close()
  })

  it('reloads RS256 key from SQLite after restart (extractable import)', async () => {
    const dir = mkdtempSync(join(tmpdir(), 'oidc-key-'))
    const dbPath = `sqlite:${join(dir, 'app.db')}`
    try {
      resetOidcKeyCache()
      const config = loadConfig({
        ...process.env,
        JWT_SECRET: 'test-secret-at-least-8',
        ADMIN_EMAIL: 'admin@test.local',
        ADMIN_PASSWORD: 'adminpass',
        DATABASE_URL: dbPath,
        ISSUER: 'https://auth.test.local',
        OIDC_ISSUER: 'https://auth.test.local',
        NODE_ENV: 'test',
      })
      const first = await buildApp({ config, databaseUrl: dbPath })
      const jwks1 = await first.inject({
        method: 'GET',
        url: '/.well-known/jwks.json',
      })
      expect(jwks1.statusCode).toBe(200)
      const kid = (jwks1.json() as { keys: { kid: string }[] }).keys[0]?.kid
      expect(kid).toBeTruthy()
      await first.close()

      resetOidcKeyCache()
      const second = await buildApp({ config, databaseUrl: dbPath })
      const jwks2 = await second.inject({
        method: 'GET',
        url: '/.well-known/jwks.json',
      })
      expect(jwks2.statusCode).toBe(200)
      expect((jwks2.json() as { keys: { kid: string }[] }).keys[0]?.kid).toBe(
        kid,
      )
      await second.close()
    } finally {
      try {
        rmSync(dir, { recursive: true, force: true })
      } catch {
        // Windows may keep better-sqlite3 handle briefly
      }
    }
  })

  it('authorization code flow issues id_token with groups', async () => {
    const app = await buildTestApp()

    const login = await app.inject({
      method: 'POST',
      url: '/api/v1/auth/login',
      payload: { email: 'admin@test.local', password: 'adminpass' },
    })
    expect(login.statusCode).toBe(200)
    const token = (login.json() as { access_token: string }).access_token
    const refresh = login.cookies.find((c) => c.name === 'refresh_token')
    expect(refresh?.value).toBeTruthy()

    const created = await app.inject({
      method: 'POST',
      url: '/api/v1/admin/oidc/clients',
      headers: { authorization: `Bearer ${token}` },
      payload: {
        name: 'Technitium',
        redirect_uris: ['https://dns.test.local/sso/callback'],
        scopes: ['openid', 'profile', 'email', 'groups'],
        enabled: true,
      },
    })
    expect(created.statusCode).toBe(200)
    const client = created.json() as {
      client_id: string
      client_secret: string
    }

    const authorize = await app.inject({
      method: 'GET',
      url:
        '/oauth/authorize?' +
        new URLSearchParams({
          client_id: client.client_id,
          redirect_uri: 'https://dns.test.local/sso/callback',
          response_type: 'code',
          scope: 'openid profile email groups',
          state: 'xyz',
          nonce: 'n1',
        }).toString(),
      cookies: { refresh_token: refresh!.value },
    })
    expect(authorize.statusCode).toBe(302)
    const location = authorize.headers.location!
    expect(location).toContain('https://dns.test.local/sso/callback')
    const code = new URL(location).searchParams.get('code')
    expect(code).toBeTruthy()

    const tokenRes = await app.inject({
      method: 'POST',
      url: '/oauth/token',
      payload: {
        grant_type: 'authorization_code',
        code: code!,
        redirect_uri: 'https://dns.test.local/sso/callback',
        client_id: client.client_id,
        client_secret: client.client_secret,
      },
    })
    expect(tokenRes.statusCode).toBe(200)
    const tokens = tokenRes.json() as {
      access_token: string
      id_token: string
      token_type: string
    }
    expect(tokens.token_type).toBe('Bearer')

    const jwksRes = await app.inject({
      method: 'GET',
      url: '/.well-known/jwks.json',
    })
    const jwks = createLocalJWKSet(jwksRes.json() as { keys: never[] })
    const { payload } = await jwtVerify(tokens.id_token, jwks, {
      issuer: 'https://auth.test.local',
      audience: client.client_id,
    })
    expect(payload.sub).toBeTruthy()
    expect(payload.email).toBe('admin@test.local')
    expect(payload.nonce).toBe('n1')
    const groups = payload.groups as string[]
    expect(groups).toContain('technitium_admins')
    expect(groups).toContain('technitium_dns_admins')

    const userinfo = await app.inject({
      method: 'GET',
      url: '/oauth/userinfo',
      headers: { authorization: `Bearer ${tokens.access_token}` },
    })
    expect(userinfo.statusCode).toBe(200)
    const info = userinfo.json() as { groups: string[]; email: string }
    expect(info.email).toBe('admin@test.local')
    expect(info.groups).toContain('technitium_admins')

    await app.close()
  })

  it('rejects invalid client secret and redirect_uri mismatch', async () => {
    const app = await buildTestApp()
    const login = await app.inject({
      method: 'POST',
      url: '/api/v1/auth/login',
      payload: { email: 'admin@test.local', password: 'adminpass' },
    })
    const token = (login.json() as { access_token: string }).access_token
    const refresh = login.cookies.find((c) => c.name === 'refresh_token')!

    const created = await app.inject({
      method: 'POST',
      url: '/api/v1/admin/oidc/clients',
      headers: { authorization: `Bearer ${token}` },
      payload: {
        name: 'DNS',
        redirect_uris: ['https://dns.test.local/sso/callback'],
        scopes: ['openid', 'profile', 'email', 'groups'],
        enabled: true,
      },
    })
    const client = created.json() as {
      client_id: string
      client_secret: string
    }

    const badRedirect = await app.inject({
      method: 'GET',
      url:
        '/oauth/authorize?' +
        new URLSearchParams({
          client_id: client.client_id,
          redirect_uri: 'https://evil.test/callback',
          response_type: 'code',
          scope: 'openid',
        }).toString(),
      cookies: { refresh_token: refresh.value },
    })
    expect(badRedirect.statusCode).toBe(400)

    const authorize = await app.inject({
      method: 'GET',
      url:
        '/oauth/authorize?' +
        new URLSearchParams({
          client_id: client.client_id,
          redirect_uri: 'https://dns.test.local/sso/callback',
          response_type: 'code',
          scope: 'openid',
        }).toString(),
      cookies: { refresh_token: refresh.value },
    })
    const code = new URL(authorize.headers.location!).searchParams.get('code')!

    const badSecret = await app.inject({
      method: 'POST',
      url: '/oauth/token',
      payload: {
        grant_type: 'authorization_code',
        code,
        redirect_uri: 'https://dns.test.local/sso/callback',
        client_id: client.client_id,
        client_secret: 'wrong-secret',
      },
    })
    expect(badSecret.statusCode).toBe(401)

    await app.close()
  })
})