import type { Awaitable } from '@vitest/utils'
import type { RuntimeContext, SuiteCollector, Test, TestAnnotation, TestContext, VitestRunner, WriteableTestContext } from './types'
import { getSafeTimers } from '@vitest/utils/timers'
import { manageArtifactAttachment, recordArtifact, recordAsyncOperation } from './artifact'
import { PendingError } from './errors'
import { finishSendTasksUpdate } from './run'
import { getRunner } from './suite'

const now = globalThis.performance
  ? globalThis.performance.now.bind(globalThis.performance)
  : Date.now

export const collectorContext: RuntimeContext = {
  tasks: [],
  currentSuite: null,
}

export function collectTask(task: SuiteCollector): void {
  collectorContext.currentSuite?.tasks.push(task)
}

export async function runWithSuite(
  suite: SuiteCollector,
  fn: () => Awaitable<void>,
): Promise<void> {
  const prev = collectorContext.currentSuite
  collectorContext.currentSuite = suite
  await fn()
  collectorContext.currentSuite = prev
}

export function withTimeout<T extends (...args: any[]) => any>(
  fn: T,
  timeout: number,
  isHook = false,
  stackTraceError?: Error,
  onTimeout?: (args: T extends (...args: infer A) => any ? A : never, error: Error) => void,
): T {
  if (timeout <= 0 || timeout === Number.POSITIVE_INFINITY) {
    return fn
  }

  const { setTimeout, clearTimeout } = getSafeTimers()

  // this function name is used to filter error in test/e2e/test/fails.test.ts
  return (function runWithTimeout(...args: T extends (...args: infer A) => any ? A : never) {
    const startTime = now()
    const runner = getRunner()
    runner._currentTaskStartTime = startTime
    runner._currentTaskTimeout = timeout
    return new Promise((resolve_, reject_) => {
      const timer = setTimeout(() => {
        clearTimeout(timer)
        rejectTimeoutError()
      }, timeout)
      // `unref` might not exist in browser
      timer.unref?.()

      function rejectTimeoutError() {
        const error = makeTimeoutError(isHook, timeout, stackTraceError)
        onTimeout?.(args, error)
        reject_(error)
      }

      function resolve(result: unknown) {
        runner._currentTaskStartTime = undefined
        runner._currentTaskTimeout = undefined
        clearTimeout(timer)
        // if test/hook took too long in microtask, setTimeout won't be triggered,
        // but we still need to fail the test, see
        // https://github.com/vitest-dev/vitest/issues/2920
        if (now() - startTime >= timeout) {
          rejectTimeoutError()
          return
        }
        resolve_(result)
      }

      function reject(error: unknown) {
        runner._currentTaskStartTime = undefined
        runner._currentTaskTimeout = undefined
        clearTimeout(timer)
        reject_(error)
      }

      // sync test/hook will be caught by try/catch
      try {
        const result = fn(...args) as PromiseLike<unknown>
        // the result is a thenable, we don't wrap this in Promise.resolve
        // to avoid creating new promises
        if (typeof result === 'object' && result != null && typeof result.then === 'function') {
          result.then(resolve, reject)
        }
        else {
          resolve(result)
        }
      }
      // user sync test/hook throws an error
      catch (error) {
        reject(error)
      }
    })
  }) as T
}

export function withCancel<T extends (...args: any[]) => any>(
  fn: T,
  signal: AbortSignal,
): T {
  return (function runWithCancel(...args: T extends (...args: infer A) => any ? A : never) {
    return new Promise((resolve, reject) => {
      const onAbort = () => reject(signal.reason)
      signal.addEventListener('abort', onAbort, { once: true })

      const cleanup = () => signal.removeEventListener('abort', onAbort)

      try {
        const result = fn(...args) as PromiseLike<unknown>

        if (typeof result === 'object' && result != null && typeof result.then === 'function') {
          result.then(
            (value) => {
              cleanup()
              resolve(value)
            },
            (error) => {
              cleanup()
              reject(error)
            },
          )
        }
        else {
          cleanup()
          resolve(result)
        }
      }
      catch (error) {
        cleanup()
        reject(error)
      }
    })
  }) as T
}

const abortControllers = new WeakMap<TestContext, AbortController>()

export function abortIfTimeout([context]: [TestContext?, unknown?], error: Error): void {
  if (context) {
    abortContextSignal(context, error)
  }
}

export function abortContextSignal(context: TestContext, error: Error): void {
  const abortController = abortControllers.get(context)
  abortController?.abort(error)
}

export function createTestContext(
  test: Test,
  runner: VitestRunner,
): TestContext {
  const context = function () {
    throw new Error('done() callback is deprecated, use promise instead')
  } as unknown as WriteableTestContext

  let abortController = abortControllers.get(context)

  if (!abortController) {
    abortController = new AbortController()
    abortControllers.set(context, abortController)
  }

  context.signal = abortController.signal
  context.task = test

  context.skip = (condition?: boolean | string, note?: string): never => {
    if (condition === false) {
      // do nothing
      return undefined as never
    }
    test.result ??= { state: 'skip' }
    test.result.pending = true
    throw new PendingError(
      'test is skipped; abort execution',
      test,
      typeof condition === 'string' ? condition : note,
    )
  }

  context.annotate = ((message, type, attachment) => {
    if (test.result && test.result.state !== 'run') {
      throw new Error(`Cannot annotate tests outside of the test run. The test "${test.name}" finished running with the "${test.result.state}" state already.`)
    }

    const annotation: TestAnnotation = {
      message,
      type: typeof type === 'object' || type === undefined ? 'notice' : type,
    }
    const annotationAttachment = typeof type === 'object' ? type : attachment

    if (annotationAttachment) {
      annotation.attachment = annotationAttachment

      manageArtifactAttachment(annotation.attachment)
    }

    return recordAsyncOperation(
      test,
      recordArtifact(test, { type: 'internal:annotation', annotation }).then(async ({ annotation }) => {
        if (!runner.onTestAnnotate) {
          throw new Error(`Test runner doesn't support test annotations.`)
        }

        await finishSendTasksUpdate(runner)

        const resolvedAnnotation = await runner.onTestAnnotate(test, annotation)
        test.annotations.push(resolvedAnnotation)
        return resolvedAnnotation
      }),
    )
  }) as TestContext['annotate']

  context.onTestFailed = (handler, timeout) => {
    test.onFailed ||= []
    test.onFailed.push(
      withTimeout(
        handler,
        timeout ?? runner.config.hookTimeout,
        true,
        new Error('STACK_TRACE_ERROR'),
        (_, error) => abortController.abort(error),
      ),
    )
  }

  context.onTestFinished = (handler, timeout) => {
    test.onFinished ||= []
    test.onFinished.push(
      withTimeout(
        handler,
        timeout ?? runner.config.hookTimeout,
        true,
        new Error('STACK_TRACE_ERROR'),
        (_, error) => abortController.abort(error),
      ),
    )
  }

  return runner.extendTaskContext?.(context) || context
}

function makeTimeoutError(isHook: boolean, timeout: number, stackTraceError?: Error) {
  const message = `${
    isHook ? 'Hook' : 'Test'
  } timed out in ${timeout}ms.\nIf this is a long-running ${
    isHook ? 'hook' : 'test'
  }, pass a timeout value as the last argument or configure it globally with "${
    isHook ? 'hookTimeout' : 'testTimeout'
  }".`
  const error = new Error(message)
  if (stackTraceError?.stack) {
    error.stack = stackTraceError.stack.replace(error.message, stackTraceError.message)
  }
  return error
}
