import { describe, it, expect, beforeEach, afterEach } from 'vitest'
import {
  constantTimeCompare,
  validateRedirectPath,
  createOidcParams,
  getCodeChallenge,
  getOidcRedirectUri,
  getOidcConfig,
  buildAuthorizeUrl,
  exchangeCode,
} from '../../server/utils/oidc.js'

describe('oidc', () => {
  describe('constantTimeCompare', () => {
    it('returns true for equal strings', () => {
      expect(constantTimeCompare('abc', 'abc')).toBe(true)
    })
    it('returns false for different strings', () => {
      expect(constantTimeCompare('abc', 'abd')).toBe(false)
    })
    it('returns false for different length', () => {
      expect(constantTimeCompare('ab', 'abc')).toBe(false)
    })
    it('returns false for non-strings', () => {
      expect(constantTimeCompare('a', 1)).toBe(false)
    })
  })

  describe('validateRedirectPath', () => {
    it('returns path for valid same-origin path', () => {
      expect(validateRedirectPath('/')).toBe('/')
      expect(validateRedirectPath('/feeds')).toBe('/feeds')
      expect(validateRedirectPath('/feeds?foo=1')).toBe('/feeds?foo=1')
    })
    it('returns / for path starting with //', () => {
      expect(validateRedirectPath('//evil.com')).toBe('/')
    })
    it('returns / for non-string or empty', () => {
      expect(validateRedirectPath('')).toBe('/')
      expect(validateRedirectPath(null)).toBe('/')
    })
    it('returns / for path containing //', () => {
      expect(validateRedirectPath('/foo//bar')).toBe('/')
    })
  })

  describe('createOidcParams', () => {
    it('returns state, nonce, and codeVerifier', () => {
      const p = createOidcParams()
      expect(p).toHaveProperty('state')
      expect(p).toHaveProperty('nonce')
      expect(p).toHaveProperty('codeVerifier')
      expect(typeof p.state).toBe('string')
      expect(typeof p.nonce).toBe('string')
      expect(typeof p.codeVerifier).toBe('string')
    })
  })

  describe('getCodeChallenge', () => {
    it('returns a string for a verifier', async () => {
      const p = createOidcParams()
      const challenge = await getCodeChallenge(p.codeVerifier)
      expect(typeof challenge).toBe('string')
      expect(challenge.length).toBeGreaterThan(0)
    })
  })

  describe('getOidcRedirectUri', () => {
    const origEnv = process.env

    afterEach(() => {
      process.env = origEnv
    })

    it('returns a URL ending with callback path when env is default', () => {
      delete process.env.OIDC_REDIRECT_URI
      delete process.env.OPENID_REDIRECT_URI
      delete process.env.NUXT_APP_URL
      delete process.env.APP_URL
      const uri = getOidcRedirectUri()
      expect(uri).toMatch(/\/api\/auth\/oidc\/callback$/)
    })

    it('returns explicit OIDC_REDIRECT_URI when set', () => {
      process.env.OIDC_REDIRECT_URI = '  https://app.example.com/oidc/cb  '
      const uri = getOidcRedirectUri()
      expect(uri).toBe('https://app.example.com/oidc/cb')
    })

    it('returns URL from NUXT_APP_URL when set and no explicit redirect', () => {
      delete process.env.OIDC_REDIRECT_URI
      delete process.env.OPENID_REDIRECT_URI
      process.env.NUXT_APP_URL = 'https://myapp.example.com/'
      const uri = getOidcRedirectUri()
      expect(uri).toBe('https://myapp.example.com/api/auth/oidc/callback')
    })

    it('returns URL from APP_URL when set and no NUXT_APP_URL', () => {
      delete process.env.OIDC_REDIRECT_URI
      delete process.env.OPENID_REDIRECT_URI
      delete process.env.NUXT_APP_URL
      process.env.APP_URL = 'https://app.example.com'
      const uri = getOidcRedirectUri()
      expect(uri).toBe('https://app.example.com/api/auth/oidc/callback')
    })
  })

  describe('getOidcConfig', () => {
    const origEnv = process.env

    beforeEach(() => {
      process.env = { ...origEnv }
    })

    afterEach(() => {
      process.env = origEnv
    })

    it('returns null when OIDC env vars missing', async () => {
      delete process.env.OIDC_ISSUER
      delete process.env.OIDC_CLIENT_ID
      delete process.env.OIDC_CLIENT_SECRET
      const config = await getOidcConfig()
      expect(config).toBeNull()
    })

    it('returns null when only some OIDC env vars set', async () => {
      process.env.OIDC_ISSUER = 'https://idp.example.com'
      process.env.OIDC_CLIENT_ID = 'client'
      delete process.env.OIDC_CLIENT_SECRET
      const config = await getOidcConfig()
      expect(config).toBeNull()
      delete process.env.OIDC_ISSUER
      delete process.env.OIDC_CLIENT_ID
    })
  })

  describe('buildAuthorizeUrl', () => {
    it('is a function that accepts config and params', () => {
      expect(typeof buildAuthorizeUrl).toBe('function')
      expect(buildAuthorizeUrl.length).toBe(2)
    })
  })

  describe('exchangeCode', () => {
    it('rejects when grant fails', async () => {
      const config = {}
      const currentUrl = 'https://app/api/auth/oidc/callback?code=abc&state=s'
      const checks = { state: 's', nonce: 'n', codeVerifier: 'v' }
      await expect(exchangeCode(config, currentUrl, checks)).rejects.toBeDefined()
    })
  })
})