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import type { IncomingMessage, ServerResponse } from 'http'
import type { NextApiResponse } from '../../../shared/lib/utils'
import { checkIsOnDemandRevalidate } from '../.'
import type { __ApiPreviewProps } from '../.'
import type { BaseNextRequest, BaseNextResponse } from '../../base-http'
import type { PreviewData } from '../../../types'

import {
  clearPreviewData,
  COOKIE_NAME_PRERENDER_BYPASS,
  COOKIE_NAME_PRERENDER_DATA,
  SYMBOL_PREVIEW_DATA,
} from '../index'
import { RequestCookies } from '../../web/spec-extension/cookies'
import { HeadersAdapter } from '../../web/spec-extension/adapters/headers'

export function tryGetPreviewData(
  req: IncomingMessage | BaseNextRequest | Request,
  res: ServerResponse | BaseNextResponse,
  options: __ApiPreviewProps,
  multiZoneDraftMode: boolean
): PreviewData {
  // if an On-Demand revalidation is being done preview mode
  // is disabled
  if (options && checkIsOnDemandRevalidate(req, options).isOnDemandRevalidate) {
    return false
  }

  // Read cached preview data if present
  // TODO: use request metadata instead of a symbol
  if (SYMBOL_PREVIEW_DATA in req) {
    return (req as any)[SYMBOL_PREVIEW_DATA] as any
  }

  const headers = HeadersAdapter.from(req.headers)
  const cookies = new RequestCookies(headers)

  const previewModeId = cookies.get(COOKIE_NAME_PRERENDER_BYPASS)?.value
  const tokenPreviewData = cookies.get(COOKIE_NAME_PRERENDER_DATA)?.value

  // Case: preview mode cookie set but data cookie is not set
  if (
    previewModeId &&
    !tokenPreviewData &&
    previewModeId === options.previewModeId
  ) {
    // This is "Draft Mode" which doesn't use
    // previewData, so we return an empty object
    // for backwards compat with "Preview Mode".
    const data = {}
    Object.defineProperty(req, SYMBOL_PREVIEW_DATA, {
      value: data,
      enumerable: false,
    })
    return data
  }

  // Case: neither cookie is set.
  if (!previewModeId && !tokenPreviewData) {
    return false
  }

  // Case: one cookie is set, but not the other.
  if (!previewModeId || !tokenPreviewData) {
    if (!multiZoneDraftMode) {
      clearPreviewData(res as NextApiResponse)
    }
    return false
  }

  // Case: preview session is for an old build.
  if (previewModeId !== options.previewModeId) {
    if (!multiZoneDraftMode) {
      clearPreviewData(res as NextApiResponse)
    }
    return false
  }

  let encryptedPreviewData: {
    data: string
  }
  try {
    const jsonwebtoken =
      require('next/dist/compiled/jsonwebtoken') as typeof import('next/dist/compiled/jsonwebtoken')
    encryptedPreviewData = jsonwebtoken.verify(
      tokenPreviewData,
      options.previewModeSigningKey
    ) as typeof encryptedPreviewData
  } catch {
    // TODO: warn
    clearPreviewData(res as NextApiResponse)
    return false
  }

  const { decryptWithSecret } =
    require('../../crypto-utils') as typeof import('../../crypto-utils')
  const decryptedPreviewData = decryptWithSecret(
    Buffer.from(options.previewModeEncryptionKey),
    encryptedPreviewData.data
  )

  try {
    // TODO: strict runtime type checking
    const data = JSON.parse(decryptedPreviewData)
    // Cache lookup
    Object.defineProperty(req, SYMBOL_PREVIEW_DATA, {
      value: data,
      enumerable: false,
    })
    return data
  } catch {
    return false
  }
}

	import type { IncomingMessage, ServerResponse } from 'http'
	import type { NextApiResponse } from '../../../shared/lib/utils'
	import { checkIsOnDemandRevalidate } from '../.'
	import type { __ApiPreviewProps } from '../.'
	import type { BaseNextRequest, BaseNextResponse } from '../../base-http'
	import type { PreviewData } from '../../../types'

	import {
	clearPreviewData,
	COOKIE_NAME_PRERENDER_BYPASS,
	COOKIE_NAME_PRERENDER_DATA,
	SYMBOL_PREVIEW_DATA,
	} from '../index'
	import { RequestCookies } from '../../web/spec-extension/cookies'
	import { HeadersAdapter } from '../../web/spec-extension/adapters/headers'

	export function tryGetPreviewData(
	req: IncomingMessage \| BaseNextRequest \| Request,
	res: ServerResponse \| BaseNextResponse,
	options: __ApiPreviewProps,
	multiZoneDraftMode: boolean
	): PreviewData {
	// if an On-Demand revalidation is being done preview mode
	// is disabled
	if (options && checkIsOnDemandRevalidate(req, options).isOnDemandRevalidate) {
	return false
	}

	// Read cached preview data if present
	// TODO: use request metadata instead of a symbol
	if (SYMBOL_PREVIEW_DATA in req) {
	return (req as any)[SYMBOL_PREVIEW_DATA] as any
	}

	const headers = HeadersAdapter.from(req.headers)
	const cookies = new RequestCookies(headers)

	const previewModeId = cookies.get(COOKIE_NAME_PRERENDER_BYPASS)?.value
	const tokenPreviewData = cookies.get(COOKIE_NAME_PRERENDER_DATA)?.value

	// Case: preview mode cookie set but data cookie is not set
	if (
	previewModeId &&
	!tokenPreviewData &&
	previewModeId === options.previewModeId
	) {
	// This is "Draft Mode" which doesn't use
	// previewData, so we return an empty object
	// for backwards compat with "Preview Mode".
	const data = {}
	Object.defineProperty(req, SYMBOL_PREVIEW_DATA, {
	value: data,
	enumerable: false,
	})
	return data
	}

	// Case: neither cookie is set.
	if (!previewModeId && !tokenPreviewData) {
	return false
	}

	// Case: one cookie is set, but not the other.
	if (!previewModeId \|\| !tokenPreviewData) {
	if (!multiZoneDraftMode) {
	clearPreviewData(res as NextApiResponse)
	}
	return false
	}

	// Case: preview session is for an old build.
	if (previewModeId !== options.previewModeId) {
	if (!multiZoneDraftMode) {
	clearPreviewData(res as NextApiResponse)
	}
	return false
	}

	let encryptedPreviewData: {
	data: string
	}
	try {
	const jsonwebtoken =
	require('next/dist/compiled/jsonwebtoken') as typeof import('next/dist/compiled/jsonwebtoken')
	encryptedPreviewData = jsonwebtoken.verify(
	tokenPreviewData,
	options.previewModeSigningKey
	) as typeof encryptedPreviewData
	} catch {
	// TODO: warn
	clearPreviewData(res as NextApiResponse)
	return false
	}

	const { decryptWithSecret } =
	require('../../crypto-utils') as typeof import('../../crypto-utils')
	const decryptedPreviewData = decryptWithSecret(
	Buffer.from(options.previewModeEncryptionKey),
	encryptedPreviewData.data
	)

	try {
	// TODO: strict runtime type checking
	const data = JSON.parse(decryptedPreviewData)
	// Cache lookup
	Object.defineProperty(req, SYMBOL_PREVIEW_DATA, {
	value: data,
	enumerable: false,
	})
	return data
	} catch {
	return false
	}
	}