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API_INFO to use the route constants and change permutations to rearrange\nconst API_INFO = {\n name: \"Simple Scrabble API\",\n version: \"1.0.0\",\n description: \"A simple API to provide data for determining if a given scrabble board is valid.\",\n endpoints: [\n {\n path: ROUTES.ROOT,\n method: \"GET\",\n description: \"Lists all available endpoints\",\n parameters: [],\n },\n {\n path: ROUTES.DICTIONARY,\n method: \"GET\",\n description: \"Returns a paginated list of dictionary words\",\n parameters: [\n { name: \"page\", type: \"number\", default: \"1\", description: \"Page number to retrieve\" },\n { name: \"size\", type: \"number\", default: \"20\", description: \"Number of items per page\" },\n ],\n },\n {\n path: ROUTES.BOARDS,\n method: \"GET\",\n description: \"Returns a complete list of boards\",\n parameters: [],\n },\n {\n path: `${ROUTES.REARRANGE}/:word`,\n method: \"GET\",\n description: \"Returns a paginated list of all possible rearrangement of characters in the input word\",\n parameters: [\n { name: \"word\", type: \"string\", description: \"The string to generate rearragements for\" },\n { name: \"page\", type: \"number\", default: \"1\", description: \"Page number to retrieve\" },\n { name: \"size\", type: \"number\", default: \"20\", description: \"Number of items per page\" },\n ],\n },\n {\n path: `${ROUTES.SCORE}/:word`,\n method: \"GET\",\n description: \"Returns the Scrabble score of a word\",\n parameters: [\n { name: \"word\", type: \"string\", description: \"The word to calculate the Scrabble score for\" },\n ],\n },\n ],\n};\n\nexport async function handler(req: Request): Promise {\n if (req.method === \"OPTIONS\") {\n return new Response(null, {\n headers: {\n \"Access-Control-Allow-Origin\": \"*\",\n \"Access-Control-Allow-Methods\": \"GET, OPTIONS\",\n \"Access-Control-Allow-Headers\": \"Content-Type\",\n },\n });\n }\n\n if (req.method !== \"GET\") {\n return new Response(JSON.stringify({ error: \"Method not allowed\" }), {\n status: 405,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n const url = new URL(req.url);\n const path = url.pathname;\n\n try {\n // Use the route constants for path matching\n if (path === ROUTES.ROOT || path === \"\") {\n return handleRootRoute(req);\n } else if (path === ROUTES.DICTIONARY || path === `${ROUTES.DICTIONARY}/`) {\n return await handleDictionaryRoute(req);\n } else if (path === ROUTES.BOARDS || path === `${ROUTES.BOARDS}/`) {\n return await handleBoardsRoute(req);\n } else if (path.startsWith(`${ROUTES.REARRANGE}/`)) {\n return handleRearrangeRoute(req);\n } else if (path.startsWith(`${ROUTES.SCORE}/`)) {\n return handleScoreRoute(req);\n } else {\n return new Response(\n JSON.stringify({\n error: \"Route not found\",\n message: `Visit the root endpoint (${ROUTES.ROOT}) for API documentation`,\n }),\n {\n status: 404,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n } catch (error) {\n return new Response(\n JSON.stringify({\n error: \"An error occurred\",\n message: error instanceof Error ? error.message : String(error),\n }),\n {\n status: 500,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n}\n\nfunction paginate(items: T[], options: PaginationOptions): PaginationResult {\n const { page, size, totalItems, basePath } = options;\n\n const totalPages = Math.ceil(totalItems / size);\n\n if (page < 1 || (page > totalPages && totalPages > 0)) {\n throw {\n status: 400,\n error: \"Page out of range\",\n pagination: {\n total: totalItems,\n total_pages: totalPages,\n },\n };\n }\n\n const startIndex = (page - 1) * size;\n const endIndex = Math.min(startIndex + size, totalItems);\n const paginatedItems = items.slice(startIndex, endIndex);\n const itemCount = paginatedItems.length;\n\n const buildPath = (pg: number): string => {\n return `${basePath}?page=${pg}&size=${size}`;\n };\n\n return {\n items: paginatedItems,\n pagination: {\n total: totalItems,\n count: itemCount,\n per_page: size,\n current_page: page,\n total_pages: totalPages,\n links: {\n next: page < totalPages ? buildPath(page + 1) : null,\n prev: page > 1 ? buildPath(page - 1) : null,\n },\n },\n };\n}\n\nfunction handleRootRoute(req: Request): Response {\n const url = new URL(req.url);\n const baseUrl = `${url.protocol}//${url.host}`;\n\n const apiInfo = {\n ...API_INFO,\n example: `curl -X GET ${baseUrl}${ROUTES.ROOT} | jq .`,\n };\n\n return new Response(JSON.stringify(apiInfo, null, 2), {\n headers: {\n \"Content-Type\": \"application/json\",\n \"Cache-Control\": \"max-age=3600\",\n },\n });\n}\n\nasync function handleDictionaryRoute(req: Request): Promise {\n const currentTime = Date.now();\n if (!dictionaryCache.length || (currentTime - dictionaryCacheTimestamp > CACHE_TTL)) {\n const response = await fetch(\n \"https://gist.githubusercontent.com/brydenfogelman/b35955805e7dca0fe57f6aa25950231c/raw/4233a5653536fe4b6984702bb9273c967c35ef91/dictionary.json\",\n );\n\n if 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currentTime = Date.now();\n if (!boardsCache.length || (currentTime - boardsCacheTimestamp > CACHE_TTL)) {\n const response = await fetch(\n \"https://gist.githubusercontent.com/brydenfogelman/517fb8666c9c144ab83873d83d44c56f/raw/4ac1123fb72818acc895e3f25e6b9a637649d00b/boards.json\",\n );\n\n if (!response.ok) {\n throw new Error(`Failed to fetch boards: ${response.status}`);\n }\n\n boardsCache = await response.json();\n boardsCacheTimestamp = currentTime;\n }\n\n const response = {\n boards: boardsCache,\n count: boardsCache.length,\n };\n\n return new Response(JSON.stringify(response, null, 2), {\n headers: {\n \"Content-Type\": \"application/json\",\n \"Cache-Control\": \"max-age=3600\",\n },\n });\n}\n\nfunction generatePermutations(str: string): string[] {\n const result: string[] = [];\n\n function permute(arr: string[], m: string[] = []) {\n if (arr.length === 0) {\n result.push(m.join(\"\"));\n } else {\n for (let i = 0; i < arr.length; i++) {\n const curr = arr.slice();\n const next = curr.splice(i, 1);\n permute(curr, m.concat(next));\n }\n }\n }\n\n permute(str.split(\"\"));\n return Array.from(new Set(result));\n}\n\nfunction handleRearrangeRoute(req: Request): Response {\n const url = new URL(req.url);\n const path = url.pathname;\n const wordMatch = path.match(new RegExp(`^${ROUTES.REARRANGE}\\\\/([^\\\\/]+)\\\\/?$`));\n\n if (!wordMatch) {\n return new Response(\n JSON.stringify({\n error: \"Invalid route format\",\n message: `Use ${ROUTES.REARRANGE}/:word format`,\n }),\n {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n\n const word = wordMatch[1];\n\n if (word.length > 10) {\n return new Response(\n JSON.stringify({\n error: \"Word too long\",\n message: \"Maximum word length for rearrangements is 10 characters due to performance constraints\",\n }),\n {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n\n const permutations = generatePermutations(word);\n\n const page = parseInt(url.searchParams.get(\"page\") || \"1\");\n const size = parseInt(url.searchParams.get(\"size\") || \"20\");\n const basePath = url.pathname;\n\n try {\n const result = paginate(permutations, {\n page,\n size,\n totalItems: permutations.length,\n basePath,\n });\n\n return new Response(\n JSON.stringify(\n {\n words: result.items,\n pagination: result.pagination,\n },\n null,\n 2,\n ),\n {\n headers: {\n \"Content-Type\": \"application/json\",\n \"Cache-Control\": \"max-age=3600\",\n },\n },\n );\n } catch (error) {\n return new Response(\n JSON.stringify(error),\n {\n status: error.status || 500,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n}\n\nfunction calculateScrabbleScore(word: string): number {\n return word\n .toLowerCase()\n .split(\"\")\n .reduce((score, letter) => {\n return score + (LETTER_VALUES[letter] || 0);\n }, 0);\n}\n\nfunction handleScoreRoute(req: Request): Response {\n const url = new URL(req.url);\n const path = url.pathname;\n 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