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import type { AppRouterInstance } from '../app-router-context.shared-runtime'
import type { Params } from '../../../server/request/params'
import type { NextRouter } from './router'

import React, { useMemo, useRef } from 'react'
import { PathnameContext } from '../hooks-client-context.shared-runtime'
import { isDynamicRoute } from './utils'
import { asPathToSearchParams } from './utils/as-path-to-search-params'
import { getRouteRegex } from './utils/route-regex'

/** It adapts a Pages Router (`NextRouter`) to the App Router Instance. */
export function adaptForAppRouterInstance(
  pagesRouter: NextRouter
): AppRouterInstance {
  return {
    back() {
      pagesRouter.back()
    },
    forward() {
      pagesRouter.forward()
    },
    refresh() {
      pagesRouter.reload()
    },
    hmrRefresh() {},
    push(href, { scroll } = {}) {
      void pagesRouter.push(href, undefined, { scroll })
    },
    replace(href, { scroll } = {}) {
      void pagesRouter.replace(href, undefined, { scroll })
    },
    prefetch(href) {
      void pagesRouter.prefetch(href)
    },
  }
}

/**
 * adaptForSearchParams transforms the ParsedURLQuery into URLSearchParams.
 *
 * @param router the router that contains the query.
 * @returns the search params in the URLSearchParams format
 */
export function adaptForSearchParams(
  router: Pick<NextRouter, 'isReady' | 'query' | 'asPath'>
): URLSearchParams {
  if (!router.isReady || !router.query) {
    return new URLSearchParams()
  }

  return asPathToSearchParams(router.asPath)
}

export function adaptForPathParams(
  router: Pick<NextRouter, 'isReady' | 'pathname' | 'query' | 'asPath'>
): Params | null {
  if (!router.isReady || !router.query) {
    return null
  }
  const pathParams: Params = {}
  const routeRegex = getRouteRegex(router.pathname)
  const keys = Object.keys(routeRegex.groups)
  for (const key of keys) {
    pathParams[key] = router.query[key]!
  }
  return pathParams
}

export function PathnameContextProviderAdapter({
  children,
  router,
  ...props
}: React.PropsWithChildren<{
  router: Pick<NextRouter, 'pathname' | 'asPath' | 'isReady' | 'isFallback'>
  isAutoExport: boolean
}>) {
  const ref = useRef(props.isAutoExport)
  const value = useMemo(() => {
    // isAutoExport is only ever `true` on the first render from the server,
    // so reset it to `false` after we read it for the first time as `true`. If
    // we don't use the value, then we don't need it.
    const isAutoExport = ref.current
    if (isAutoExport) {
      ref.current = false
    }

    // When the route is a dynamic route, we need to do more processing to
    // determine if we need to stop showing the pathname.
    if (isDynamicRoute(router.pathname)) {
      // When the router is rendering the fallback page, it can't possibly know
      // the path, so return `null` here. Read more about fallback pages over
      // at:
      // https://nextjs.org/docs/api-reference/data-fetching/get-static-paths#fallback-pages
      if (router.isFallback) {
        return null
      }

      // When `isAutoExport` is true, meaning this is a page page has been
      // automatically statically optimized, and the router is not ready, then
      // we can't know the pathname yet. Read more about automatic static
      // optimization at:
      // https://nextjs.org/docs/advanced-features/automatic-static-optimization
      if (isAutoExport && !router.isReady) {
        return null
      }
    }

    // The `router.asPath` contains the pathname seen by the browser (including
    // any query strings), so it should have that stripped. Read more about the
    // `asPath` option over at:
    // https://nextjs.org/docs/api-reference/next/router#router-object
    let url: URL
    try {
      url = new URL(router.asPath, 'http://f')
    } catch (_) {
      // fallback to / for invalid asPath values e.g. //
      return '/'
    }

    return url.pathname
  }, [router.asPath, router.isFallback, router.isReady, router.pathname])

  return (
    <PathnameContext.Provider value={value}>
      {children}
    </PathnameContext.Provider>
  )
}

	import type { AppRouterInstance } from '../app-router-context.shared-runtime'
	import type { Params } from '../../../server/request/params'
	import type { NextRouter } from './router'

	import React, { useMemo, useRef } from 'react'
	import { PathnameContext } from '../hooks-client-context.shared-runtime'
	import { isDynamicRoute } from './utils'
	import { asPathToSearchParams } from './utils/as-path-to-search-params'
	import { getRouteRegex } from './utils/route-regex'

	/** It adapts a Pages Router (`NextRouter`) to the App Router Instance. */
	export function adaptForAppRouterInstance(
	pagesRouter: NextRouter
	): AppRouterInstance {
	return {
	back() {
	pagesRouter.back()
	},
	forward() {
	pagesRouter.forward()
	},
	refresh() {
	pagesRouter.reload()
	},
	hmrRefresh() {},
	push(href, { scroll } = {}) {
	void pagesRouter.push(href, undefined, { scroll })
	},
	replace(href, { scroll } = {}) {
	void pagesRouter.replace(href, undefined, { scroll })
	},
	prefetch(href) {
	void pagesRouter.prefetch(href)
	},
	}
	}

	/**
	* adaptForSearchParams transforms the ParsedURLQuery into URLSearchParams.
	*
	* @param router the router that contains the query.
	* @returns the search params in the URLSearchParams format
	*/
	export function adaptForSearchParams(
	router: Pick<NextRouter, 'isReady' \| 'query' \| 'asPath'>
	): URLSearchParams {
	if (!router.isReady \|\| !router.query) {
	return new URLSearchParams()
	}

	return asPathToSearchParams(router.asPath)
	}

	export function adaptForPathParams(
	router: Pick<NextRouter, 'isReady' \| 'pathname' \| 'query' \| 'asPath'>
	): Params \| null {
	if (!router.isReady \|\| !router.query) {
	return null
	}
	const pathParams: Params = {}
	const routeRegex = getRouteRegex(router.pathname)
	const keys = Object.keys(routeRegex.groups)
	for (const key of keys) {
	pathParams[key] = router.query[key]!
	}
	return pathParams
	}

	export function PathnameContextProviderAdapter({
	children,
	router,
	...props
	}: React.PropsWithChildren<{
	router: Pick<NextRouter, 'pathname' \| 'asPath' \| 'isReady' \| 'isFallback'>
	isAutoExport: boolean
	}>) {
	const ref = useRef(props.isAutoExport)
	const value = useMemo(() => {
	// isAutoExport is only ever `true` on the first render from the server,
	// so reset it to `false` after we read it for the first time as `true`. If
	// we don't use the value, then we don't need it.
	const isAutoExport = ref.current
	if (isAutoExport) {
	ref.current = false
	}

	// When the route is a dynamic route, we need to do more processing to
	// determine if we need to stop showing the pathname.
	if (isDynamicRoute(router.pathname)) {
	// When the router is rendering the fallback page, it can't possibly know
	// the path, so return `null` here. Read more about fallback pages over
	// at:
	// https://nextjs.org/docs/api-reference/data-fetching/get-static-paths#fallback-pages
	if (router.isFallback) {
	return null
	}

	// When `isAutoExport` is true, meaning this is a page page has been
	// automatically statically optimized, and the router is not ready, then
	// we can't know the pathname yet. Read more about automatic static
	// optimization at:
	// https://nextjs.org/docs/advanced-features/automatic-static-optimization
	if (isAutoExport && !router.isReady) {
	return null
	}
	}

	// The `router.asPath` contains the pathname seen by the browser (including
	// any query strings), so it should have that stripped. Read more about the
	// `asPath` option over at:
	// https://nextjs.org/docs/api-reference/next/router#router-object
	let url: URL
	try {
	url = new URL(router.asPath, 'http://f')
	} catch (_) {
	// fallback to / for invalid asPath values e.g. //
	return '/'
	}

	return url.pathname
	}, [router.asPath, router.isFallback, router.isReady, router.pathname])

	return (
	<PathnameContext.Provider value={value}>
	{children}
	</PathnameContext.Provider>
	)
	}