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import { getRouteMatcher } from '../../shared/lib/router/utils/route-matcher'
import { getRouteRegex } from '../../shared/lib/router/utils/route-regex'
export type FallbackRouteParams = ReadonlyMap<string, string>
function getParamKeys(page: string) {
const pattern = getRouteRegex(page)
const matcher = getRouteMatcher(pattern)
// Get the default list of allowed params.
return Object.keys(matcher(page))
}
export function getFallbackRouteParams(
pageOrKeys: string | readonly string[]
): FallbackRouteParams | null {
let keys: readonly string[]
if (typeof pageOrKeys === 'string') {
keys = getParamKeys(pageOrKeys)
} else {
keys = pageOrKeys
}
// If there are no keys, we can return early.
if (keys.length === 0) return null
const params = new Map<string, string>()
// As we're creating unique keys for each of the dynamic route params, we only
// need to generate a unique ID once per request because each of the keys will
// be also be unique.
const uniqueID = Math.random().toString(16).slice(2)
for (const key of keys) {
params.set(key, `%%drp:${key}:${uniqueID}%%`)
}
return params
}
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