import { resolve } from 'node:path'
import { defu } from 'defu'
import type { TestContext, TestOptions, TestRunner } from './types'

let currentContext: TestContext | undefined

export function createTestContext (options: Partial<TestOptions>): TestContext {
  const _options: Partial<TestOptions> = defu(options, {
    testDir: resolve(process.cwd(), 'test'),
    fixture: 'fixture',
    configFile: 'nuxt.config',
    setupTimeout: 120 * 1000,
    dev: !!JSON.parse(process.env.NUXT_TEST_DEV || 'false'),
    logLevel: 1,
    server: true,
    build: (options.browser !== false) || (options.server !== false),
    nuxtConfig: {},
    // TODO: auto detect based on process.env
    runner: <TestRunner>'vitest',
    browserOptions: {
      type: 'chromium' as const
    }
  })

  return setTestContext({
    options: _options as TestOptions
  })
}

export function useTestContext (): TestContext {
  recoverContextFromEnv()
  if (!currentContext) {
    throw new Error('No context is available. (Forgot calling setup or createContext?)')
  }
  return currentContext
}

export function setTestContext (context: TestContext): TestContext
export function setTestContext (context?: TestContext): TestContext | undefined
export function setTestContext (context?: TestContext): TestContext | undefined {
  currentContext = context
  return currentContext
}

export function isDev () {
  const ctx = useTestContext()
  return ctx.options.dev
}

export function recoverContextFromEnv () {
  if (!currentContext && process.env.NUXT_TEST_CONTEXT) {
    setTestContext(JSON.parse(process.env.NUXT_TEST_CONTEXT || '{}'))
  }
}

export function exposeContextToEnv () {
  const { options, browser, url } = currentContext!
  process.env.NUXT_TEST_CONTEXT = JSON.stringify({ options, browser, url })
}