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@deno-types=\"https://esm.town/v/std/blob/main.ts\"\nimport { blob } from \"https://esm.town/v/std/blob/main.ts\";\n\n// ─────────────────────────────────────────────\n// Types\n// ─────────────────────────────────────────────\n\nexport interface Song {\n id: string;\n name: string;\n artist?: string;\n mimeType: string; // e.g. \"audio/mpeg\", \"audio/ogg\"\n sizeBytes: number;\n createdAt: string;\n}\n\nexport interface Level {\n id: string;\n name: string;\n difficulty: \"easy\" | \"medium\" | \"hard\" | \"insane\";\n rating: number; // 0-100\n content: unknown[]; // JSON array of level data (platforms, enemies, etc)\n official: boolean;\n songId?: string; // optional reference to a Song\n createdAt: string;\n updatedAt: string;\n}\n\nexport interface SearchQuery {\n name?: string;\n difficulty?: Level[\"difficulty\"];\n minRating?: number;\n maxRating?: number;\n official?: boolean;\n}\n\n// ─────────────────────────────────────────────\n// Helpers\n// ─────────────────────────────────────────────\n\nfunction generateId(): string {\n return crypto.randomUUID();\n}\n\n// ─────────────────────────────────────────────\n// Song storage helpers\n// ─────────────────────────────────────────────\n\nasync function getAllSongs(): Promise {\n const data = await blob.getJSON(\"songs\");\n return (data as Song[]) || [];\n}\n\nasync function saveSongs(songs: Song[]): Promise {\n await blob.setJSON(\"songs\", songs);\n}\n\n// Store raw audio bytes as base64 under a separate key\nfunction songDataKey(id: string): string {\n return `song_data_${id}`;\n}\n\n// ─────────────────────────────────────────────\n// Song CRUD\n// ─────────────────────────────────────────────\n\nexport async function addSong(\n name: string,\n mimeType: string,\n audioBytes: Uint8Array,\n artist?: string,\n): Promise {\n const songs = await getAllSongs();\n\n // Encode audio to base64 in chunks to avoid call stack overflow on large files\n let binary = \"\";\n const chunkSize = 8192;\n for (let i = 0; i < audioBytes.length; i += chunkSize) {\n binary += String.fromCharCode(...audioBytes.subarray(i, i + chunkSize));\n }\n const base64 = btoa(binary);\n const id = generateId();\n await blob.setJSON(songDataKey(id), base64);\n\n const now = new Date().toISOString();\n const newSong: Song = {\n id,\n name,\n artist,\n mimeType,\n sizeBytes: audioBytes.byteLength,\n createdAt: now,\n };\n\n songs.push(newSong);\n await saveSongs(songs);\n return newSong;\n}\n\nexport async function getSong(id: string): Promise {\n const songs = await getAllSongs();\n return songs.find((s) => s.id === id);\n}\n\nexport async function getSongAudio(\n id: string,\n): Promise {\n const base64 = await blob.getJSON(songDataKey(id)) as string | null;\n if (!base64) return undefined;\n const binary = atob(base64);\n const bytes = new Uint8Array(binary.length);\n for (let i = 0; i < binary.length; i++) {\n bytes[i] = binary.charCodeAt(i);\n }\n return bytes;\n}\n\nexport async function deleteSong(id: string): Promise {\n const songs = await getAllSongs();\n const index = songs.findIndex((s) => s.id === id);\n if (index === -1) return false;\n songs.splice(index, 1);\n await saveSongs(songs);\n // Also remove the audio data\n await blob.setJSON(songDataKey(id), null);\n return true;\n}\n\n// ─────────────────────────────────────────────\n// Level storage helpers\n// ─────────────────────────────────────────────\n\nasync function getAllLevels(): Promise {\n const data = await blob.getJSON(\"levels\");\n return (data as Level[]) || [];\n}\n\nasync function saveLevels(levels: Level[]): Promise {\n await blob.setJSON(\"levels\", levels);\n}\n\n// ─────────────────────────────────────────────\n// Level CRUD\n// ─────────────────────────────────────────────\n\nexport async function addLevel(\n name: string,\n difficulty: Level[\"difficulty\"],\n rating: number,\n content: unknown[],\n official: boolean = false,\n songId?: string,\n): Promise {\n const levels = await getAllLevels();\n\n const now = new Date().toISOString();\n const newLevel: Level = {\n id: generateId(),\n name,\n difficulty,\n rating,\n content,\n official,\n songId,\n createdAt: now,\n updatedAt: now,\n };\n\n levels.push(newLevel);\n await saveLevels(levels);\n return newLevel;\n}\n\nexport async function getLevel(id: string): Promise {\n const levels = await getAllLevels();\n return levels.find((l) => l.id === id);\n}\n\nexport async function getLevelContent(\n id: string,\n): Promise {\n const level = await getLevel(id);\n return level?.content;\n}\n\nexport async function searchLevels(query: SearchQuery): Promise {\n const levels = await getAllLevels();\n\n return levels.filter((level) => {\n if (\n query.name && !level.name.toLowerCase().includes(query.name.toLowerCase())\n ) return false;\n if (query.difficulty && level.difficulty !== query.difficulty) return false;\n if (query.minRating !== undefined && level.rating < query.minRating) {\n return false;\n }\n if (query.maxRating !== undefined && level.rating > query.maxRating) {\n return false;\n }\n if (query.official !== undefined && level.official !== query.official) {\n return false;\n }\n return true;\n });\n}\n\nexport async function updateLevel(\n id: string,\n updates: Partial>,\n): Promise {\n const levels = await getAllLevels();\n const index = levels.findIndex((l) => l.id === id);\n if (index === -1) return undefined;\n\n const updated: Level = {\n ...levels[index],\n ...updates,\n updatedAt: new Date().toISOString(),\n };\n\n levels[index] = updated;\n await saveLevels(levels);\n return updated;\n}\n\nexport async function deleteLevel(id: string): Promise {\n const levels = await getAllLevels();\n const index = levels.findIndex((l) => l.id === id);\n if (index === -1) return false;\n levels.splice(index, 1);\n await saveLevels(levels);\n return true;\n}\n\n// ─────────────────────────────────────────────\n// HTTP handler\n// ─────────────────────────────────────────────\n\nexport default async function handler(req: Request): Promise {\n const url = new URL(req.url);\n const pathname = url.pathname;\n const method = req.method;\n\n try {\n // ══════════════════════════════════════════\n // SONG ROUTES\n // ══════════════════════════════════════════\n\n // POST /song — upload a new song\n // Accepts multipart/form-data with fields:\n // file (required) — the audio file\n // name (optional) — display name; falls back to filename\n // artist (optional) — artist name\n if (pathname === \"/song\" && method === \"POST\") {\n const ct = req.headers.get(\"content-type\") || \"\";\n\n let audioBytes: Uint8Array;\n let mimeType: string;\n let name: string;\n let artist: string | undefined;\n\n if (ct.includes(\"multipart/form-data\")) {\n const form = await req.formData();\n const file = form.get(\"file\") as File | null;\n if (!file) {\n return json({ error: \"Missing 'file' field in form data\" }, 400);\n }\n audioBytes = new Uint8Array(await file.arrayBuffer());\n mimeType = file.type || \"audio/mpeg\";\n name = (form.get(\"name\") as string | null) || file.name || \"Untitled\";\n artist = (form.get(\"artist\") as string | null) || undefined;\n } else {\n // Fallback: raw binary body; pass name/artist/mimeType as query params\n audioBytes = new Uint8Array(await req.arrayBuffer());\n mimeType = ct || url.searchParams.get(\"mimeType\") || \"audio/mpeg\";\n name = url.searchParams.get(\"name\") || \"Untitled\";\n artist = url.searchParams.get(\"artist\") || undefined;\n }\n\n if (!audioBytes.byteLength) {\n return json({ error: \"Empty audio body\" }, 400);\n }\n\n const song = await addSong(name, mimeType, audioBytes, artist);\n return json(song, 201);\n }\n\n // GET /songs — list all song metadata (no audio bytes)\n if (pathname === \"/songs\" && method === \"GET\") {\n const songs = await getAllSongs();\n return json(songs);\n }\n\n // GET /song/[id] — song metadata\n if (method === \"GET\") {\n const m = pathname.match(/^\\/song\\/([^/]+)$/);\n if (m) {\n const song = await getSong(m[1]);\n if (!song) return notFound(\"Song not found\");\n return json(song);\n }\n }\n\n // GET /song/[id]/audio — stream the audio file\n if (method === \"GET\") {\n const m = pathname.match(/^\\/song\\/([^/]+)\\/audio$/);\n if (m) {\n const song = await getSong(m[1]);\n if (!song) return notFound(\"Song not found\");\n const bytes = await getSongAudio(m[1]);\n if (!bytes) return notFound(\"Audio data not found\");\n return new Response(bytes, {\n status: 200,\n headers: { \"Content-Type\": song.mimeType },\n });\n }\n }\n\n // DELETE /song/[id]\n if (method === \"DELETE\") {\n const m = pathname.match(/^\\/song\\/([^/]+)$/);\n if (m) {\n const deleted = await deleteSong(m[1]);\n if (!deleted) return notFound(\"Song not found\");\n return new Response(\"Song deleted\", { status: 200 });\n }\n }\n\n // ══════════════════════════════════════════\n // LEVEL ROUTES (unchanged + songId support)\n // ══════════════════════════════════════════\n\n // GET /level/[id]\n if (method === \"GET\") {\n const m = pathname.match(/^\\/level\\/([^/]+)$/);\n if (m) {\n const level = await getLevel(m[1]);\n if (!level) return notFound(\"Level not found\");\n return json(level);\n }\n }\n\n // GET /level/[id]/content\n if (method === \"GET\") {\n const m = pathname.match(/^\\/level\\/([^/]+)\\/content$/);\n if (m) {\n const content = await getLevelContent(m[1]);\n if (!content) return notFound(\"Level not found\");\n return json(content);\n }\n }\n\n // GET /level/[id]/name\n if (method === \"GET\") {\n const m = pathname.match(/^\\/level\\/([^/]+)\\/name$/);\n if (m) {\n const level = await getLevel(m[1]);\n if (!level) return notFound(\"Level not found\");\n return new Response(level.name, {\n status: 200,\n headers: { \"Content-Type\": \"text/plain; charset=utf-8\" },\n });\n }\n }\n\n // GET /level/[id]/song — convenience: redirect to the song's audio stream\n if (method === \"GET\") {\n const m = pathname.match(/^\\/level\\/([^/]+)\\/song$/);\n if (m) {\n const level = await getLevel(m[1]);\n if (!level) return notFound(\"Level not found\");\n if (!level.songId) return notFound(\"This level has no song attached\");\n const song = await getSong(level.songId);\n if (!song) return notFound(\"Referenced song not found\");\n const bytes = await getSongAudio(level.songId);\n if (!bytes) return notFound(\"Audio data not found\");\n return new Response(bytes, {\n status: 200,\n headers: { \"Content-Type\": song.mimeType },\n });\n }\n }\n\n // PUT /level/[id]\n if (method === \"PUT\") {\n const m = pathname.match(/^\\/level\\/([^/]+)$/);\n if (m) {\n const body = await req.json();\n const updated = await updateLevel(m[1], body);\n if (!updated) return notFound(\"Level not found\");\n return json(updated);\n }\n }\n\n // DELETE /level/[id]\n if (method === \"DELETE\") {\n const m = pathname.match(/^\\/level\\/([^/]+)$/);\n if (m) {\n const deleted = await deleteLevel(m[1]);\n if (!deleted) return notFound(\"Level not found\");\n return new Response(\"Level deleted\", { status: 200 });\n }\n }\n\n // GET /levels\n if (pathname === \"/levels\" && method === \"GET\") {\n const levels = await getAllLevels();\n return json(levels.map((l) => l.id));\n }\n\n // GET /levels/search\n if (pathname === \"/levels/search\" && method === \"GET\") {\n const query: SearchQuery = {};\n const name = url.searchParams.get(\"name\");\n const difficulty = url.searchParams.get(\"difficulty\") as\n | Level[\"difficulty\"]\n | null;\n const minRating = url.searchParams.get(\"minRating\");\n const maxRating = url.searchParams.get(\"maxRating\");\n const official = url.searchParams.get(\"official\");\n\n if (name) query.name = name;\n if (difficulty) query.difficulty = difficulty;\n if (minRating !== null) query.minRating = Number(minRating);\n if (maxRating !== null) query.maxRating = Number(maxRating);\n if (official !== null) query.official = official === \"true\";\n\n return json(await searchLevels(query));\n }\n\n // POST /levels — now accepts optional songId\n if (pathname === \"/levels\" && method === \"POST\") {\n const body = await req.json();\n\n if (\n !body.name || !body.difficulty || body.rating === undefined ||\n !body.content\n ) {\n return json({\n error: \"Missing required fields: name, difficulty, rating, content\",\n }, 400);\n }\n\n // Validate songId if provided\n if (body.songId) {\n const song = await getSong(body.songId);\n if (!song) {\n return json(\n { error: `Song with id '${body.songId}' not found` },\n 400,\n );\n }\n }\n\n const newLevel = await addLevel(\n body.name,\n body.difficulty,\n body.rating,\n body.content,\n body.official || false,\n body.songId,\n );\n\n return json(newLevel, 201);\n }\n\n // ── Legacy /levels/[id] routes ──────────────────────────────────────────\n\n if (method === \"GET\") {\n const m = pathname.match(/^\\/levels\\/([^/]+)$/);\n if (m) {\n const level = await getLevel(m[1]);\n if (!level) return notFound(\"Level not found\");\n return json(level);\n }\n }\n\n if (method === \"GET\") {\n const m = pathname.match(/^\\/levels\\/([^/]+)\\/content$/);\n if (m) {\n const content = await getLevelContent(m[1]);\n if (!content) return notFound(\"Level not found\");\n return json(content);\n }\n }\n\n if (method === \"PUT\") {\n const m = pathname.match(/^\\/levels\\/([^/]+)$/);\n if (m) {\n const body = await req.json();\n const updated = await updateLevel(m[1], body);\n if (!updated) return notFound(\"Level not found\");\n return json(updated);\n }\n }\n\n if (method === \"DELETE\") {\n const m = pathname.match(/^\\/levels\\/([^/]+)$/);\n if (m) {\n const deleted = await deleteLevel(m[1]);\n if (!deleted) return notFound(\"Level not found\");\n return new Response(\"Level deleted\", { status: 200 });\n }\n }\n\n return new Response(\"Not found\", { status: 404 });\n } catch (error) {\n console.error(\"Error:\", error);\n return json({\n error: \"Internal server error\",\n message: error instanceof Error ? error.message : \"Unknown error\",\n }, 500);\n }\n}\n\n// ─────────────────────────────────────────────\n// Small helpers\n// ─────────────────────────────────────────────\n\nfunction json(data: unknown, status = 200): Response {\n return new Response(JSON.stringify(data), {\n status,\n headers: { \"Content-Type\": \"application/json\" },\n });\n}\n\nfunction notFound(msg: string): Response {\n return new Response(msg, { status: 404 });\n}\n\nexport type { Level, SearchQuery, Song };","// @deno-types=\"https://esm.town/v/std/blob/main.ts\"\nimport { blob } from \"https://esm.town/v/std/blob/main.ts\";\n\n// ─────────────────────────────────────────────\n// Types\n// ─────────────────────────────────────────────\n\nexport interface Song {\n id: string;\n name: string;\n artist?: string;\n mimeType: string; // e.g. \"audio/mpeg\", \"audio/ogg\"\n sizeBytes: number;\n createdAt: string;\n}\n\nexport interface Level {\n id: string;\n name: string;\n difficulty: \"easy\" | \"medium\" | \"hard\" | \"insane\";\n rating: number; // 0-100\n content: unknown[]; // JSON array of level data (platforms, enemies, etc)\n official: boolean;\n songId?: string; // optional reference to a Song\n createdAt: string;\n updatedAt: string;\n}\n\nexport interface SearchQuery {\n name?: string;\n difficulty?: Level[\"difficulty\"];\n minRating?: number;\n maxRating?: number;\n official?: boolean;\n}\n\n// ─────────────────────────────────────────────\n// Helpers\n// ─────────────────────────────────────────────\n\nfunction generateId(): string {\n return crypto.randomUUID();\n}\n\n// ─────────────────────────────────────────────\n// Song storage helpers\n// ─────────────────────────────────────────────\n\nasync function getAllSongs(): Promise {\n const data = await blob.getJSON(\"songs\");\n return (data as Song[]) || [];\n}\n\nasync function saveSongs(songs: Song[]): Promise {\n await blob.setJSON(\"songs\", songs);\n}\n\n// Store raw audio bytes as base64 under a separate key\nfunction songDataKey(id: string): string {\n return `song_data_${id}`;\n}\n\n// ─────────────────────────────────────────────\n// Song CRUD\n// ─────────────────────────────────────────────\n\nexport async function addSong(\n name: string,\n mimeType: string,\n audioBytes: Uint8Array,\n artist?: string,\n): Promise {\n const songs = await getAllSongs();\n\n // Encode audio to base64 in chunks to avoid call stack overflow on large files\n let binary = \"\";\n const chunkSize = 8192;\n for (let i = 0; i < audioBytes.length; i += chunkSize) {\n binary += String.fromCharCode(...audioBytes.subarray(i, i + chunkSize));\n }\n const base64 = btoa(binary);\n const id = generateId();\n await blob.setJSON(songDataKey(id), base64);\n\n const now = new Date().toISOString();\n const newSong: Song = {\n id,\n name,\n artist,\n mimeType,\n sizeBytes: audioBytes.byteLength,\n createdAt: now,\n };\n\n songs.push(newSong);\n await saveSongs(songs);\n return newSong;\n}\n\nexport async function getSong(id: string): Promise {\n const songs = await getAllSongs();\n return songs.find((s) => s.id === id);\n}\n\nexport async function getSongAudio(\n id: string,\n): Promise {\n const base64 = await blob.getJSON(songDataKey(id)) as string | null;\n if (!base64) return undefined;\n const binary = atob(base64);\n const bytes = new Uint8Array(binary.length);\n for (let i = 0; i < binary.length; i++) {\n bytes[i] = binary.charCodeAt(i);\n }\n return bytes;\n}\n\nexport async function deleteSong(id: string): Promise {\n const songs = await getAllSongs();\n const index = songs.findIndex((s) => s.id === id);\n if (index === -1) return false;\n songs.splice(index, 1);\n await saveSongs(songs);\n // Also remove the audio data\n await blob.setJSON(songDataKey(id), null);\n return true;\n}\n\n// ─────────────────────────────────────────────\n// Level storage helpers\n// ─────────────────────────────────────────────\n\nasync function getAllLevels(): Promise {\n const data = await blob.getJSON(\"levels\");\n return (data as Level[]) || [];\n}\n\nasync function saveLevels(levels: Level[]): Promise {\n await blob.setJSON(\"levels\", levels);\n}\n\n// ─────────────────────────────────────────────\n// Level CRUD\n// ─────────────────────────────────────────────\n\nexport async function addLevel(\n name: string,\n difficulty: Level[\"difficulty\"],\n rating: number,\n content: unknown[],\n official: boolean = false,\n songId?: string,\n): Promise {\n const levels = await getAllLevels();\n\n const now = new Date().toISOString();\n const newLevel: Level = {\n id: generateId(),\n name,\n difficulty,\n rating,\n content,\n official,\n songId,\n createdAt: now,\n updatedAt: now,\n };\n\n levels.push(newLevel);\n await saveLevels(levels);\n return newLevel;\n}\n\nexport async function getLevel(id: string): Promise {\n const levels = await getAllLevels();\n return levels.find((l) => l.id === id);\n}\n\nexport async function getLevelContent(\n id: string,\n): Promise {\n const level = await getLevel(id);\n return level?.content;\n}\n\nexport async function searchLevels(query: SearchQuery): Promise {\n const levels = await getAllLevels();\n\n return levels.filter((level) => {\n if (\n query.name && !level.name.toLowerCase().includes(query.name.toLowerCase())\n ) return false;\n if (query.difficulty && level.difficulty !== query.difficulty) return false;\n if (query.minRating !== undefined && level.rating < query.minRating) {\n return false;\n }\n if (query.maxRating !== undefined && level.rating > query.maxRating) {\n return false;\n }\n if (query.official !== undefined && level.official !== query.official) {\n return false;\n }\n return true;\n });\n}\n\nexport async function updateLevel(\n id: string,\n updates: Partial>,\n): Promise {\n const levels = await getAllLevels();\n const index = levels.findIndex((l) => l.id === id);\n if (index === -1) return undefined;\n\n const updated: Level = {\n ...levels[index],\n ...updates,\n updatedAt: new Date().toISOString(),\n };\n\n levels[index] = updated;\n await saveLevels(levels);\n return updated;\n}\n\nexport async function deleteLevel(id: string): Promise {\n const levels = await getAllLevels();\n const index = levels.findIndex((l) => l.id === id);\n if (index === -1) return false;\n levels.splice(index, 1);\n await saveLevels(levels);\n return true;\n}\n\n// ─────────────────────────────────────────────\n// HTTP handler\n// ─────────────────────────────────────────────\n\nexport default async function handler(req: Request): Promise {\n const url = new URL(req.url);\n const pathname = url.pathname;\n const method = req.method;\n\n try {\n // ══════════════════════════════════════════\n // SONG ROUTES\n // ══════════════════════════════════════════\n\n // POST /song — upload a new song\n // Accepts multipart/form-data with fields:\n // file (required) — the audio file\n // name (optional) — display name; falls back to filename\n // artist (optional) — artist name\n if (pathname === \"/song\" && method === \"POST\") {\n const ct = req.headers.get(\"content-type\") || \"\";\n\n let audioBytes: Uint8Array;\n let mimeType: string;\n let name: string;\n let artist: string | undefined;\n\n if (ct.includes(\"multipart/form-data\")) {\n const form = await req.formData();\n const file = form.get(\"file\") as File | null;\n if (!file) {\n return json({ error: \"Missing 'file' field in form data\" }, 400);\n }\n audioBytes = new Uint8Array(await file.arrayBuffer());\n mimeType = file.type || \"audio/mpeg\";\n name = (form.get(\"name\") as string | null) || file.name || \"Untitled\";\n artist = (form.get(\"artist\") as string | null) || undefined;\n } else {\n // Fallback: raw binary body; pass name/artist/mimeType as query params\n audioBytes = new Uint8Array(await req.arrayBuffer());\n mimeType = ct || url.searchParams.get(\"mimeType\") || \"audio/mpeg\";\n name = url.searchParams.get(\"name\") || \"Untitled\";\n artist = url.searchParams.get(\"artist\") || undefined;\n }\n\n if (!audioBytes.byteLength) {\n return json({ error: \"Empty audio body\" }, 400);\n }\n\n const song = await addSong(name, mimeType, audioBytes, artist);\n return json(song, 201);\n }\n\n // GET /songs — list all song metadata (no audio bytes)\n if (pathname === \"/songs\" && method === \"GET\") {\n const songs = await getAllSongs();\n return json(songs);\n }\n\n // GET /song/[id] — song metadata\n if (method === \"GET\") {\n const m = pathname.match(/^\\/song\\/([^/]+)$/);\n if (m) {\n const song = await getSong(m[1]);\n if (!song) return notFound(\"Song not found\");\n return json(song);\n }\n }\n\n // GET /song/[id]/audio — stream the audio file\n if (method === \"GET\") {\n const m = pathname.match(/^\\/song\\/([^/]+)\\/audio$/);\n if (m) {\n const song = await getSong(m[1]);\n if (!song) return notFound(\"Song not found\");\n const bytes = await getSongAudio(m[1]);\n if (!bytes) return notFound(\"Audio data not found\");\n return new Response(bytes, {\n status: 200,\n headers: { \"Content-Type\": song.mimeType },\n });\n }\n }\n\n // DELETE /song/[id]\n if (method === \"DELETE\") {\n const m = pathname.match(/^\\/song\\/([^/]+)$/);\n if (m) {\n const deleted = await deleteSong(m[1]);\n if (!deleted) return notFound(\"Song not found\");\n return new Response(\"Song deleted\", { status: 200 });\n }\n }\n\n // ══════════════════════════════════════════\n // COMBINED UPLOAD: level + song in one request\n // ══════════════════════════════════════════\n\n // POST /level/upload — multipart/form-data fields:\n // name (required) — level name\n // difficulty (required) — easy | medium | hard | insane\n // rating (required) — 0-100\n // content (required) — JSON string of level data array\n // official (optional) — \"true\" | \"false\"\n // song (optional) — audio file\n // songName (optional) — display name for the song\n // songArtist (optional) — artist name\n if (pathname === \"/level/upload\" && method === \"POST\") {\n const ct = req.headers.get(\"content-type\") || \"\";\n if (!ct.includes(\"multipart/form-data\")) {\n return json({ error: \"Content-Type must be multipart/form-data\" }, 400);\n }\n\n const form = await req.formData();\n\n // Level fields\n const name = form.get(\"name\") as string | null;\n const difficulty = form.get(\"difficulty\") as Level[\"difficulty\"] | null;\n const ratingRaw = form.get(\"rating\") as string | null;\n const contentRaw = form.get(\"content\") as string | null;\n const official = (form.get(\"official\") as string | null) === \"true\";\n\n if (!name || !difficulty || ratingRaw === null || !contentRaw) {\n return json({\n error: \"Missing required fields: name, difficulty, rating, content\",\n }, 400);\n }\n\n const rating = Number(ratingRaw);\n if (isNaN(rating) || rating < 0 || rating > 100) {\n return json(\n { error: \"rating must be a number between 0 and 100\" },\n 400,\n );\n }\n\n let content: unknown[];\n try {\n content = JSON.parse(contentRaw);\n if (!Array.isArray(content)) throw new Error();\n } catch {\n return json({ error: \"content must be a JSON array string\" }, 400);\n }\n\n // Optional song — either an existing songId OR a new file upload (songId takes priority)\n let songId: string | undefined;\n const existingSongId = form.get(\"songId\") as string | null;\n const songFile = form.get(\"song\") as File | null;\n\n if (existingSongId) {\n const existing = await getSong(existingSongId);\n if (!existing) {\n return json(\n { error: `Song with id '${existingSongId}' not found` },\n 400,\n );\n }\n songId = existingSongId;\n } else if (songFile && songFile.size > 0) {\n const audioBytes = new Uint8Array(await songFile.arrayBuffer());\n const songName = (form.get(\"songName\") as string | null) ||\n songFile.name || name;\n const songArtist = (form.get(\"songArtist\") as string | null) ||\n undefined;\n const mimeType = songFile.type || \"audio/mpeg\";\n const song = await addSong(songName, mimeType, audioBytes, songArtist);\n songId = song.id;\n }\n\n const level = await addLevel(\n name,\n difficulty,\n rating,\n content,\n official,\n songId,\n );\n return json({ level, songId }, 201);\n }\n\n // ══════════════════════════════════════════\n // LEVEL ROUTES (unchanged + songId support)\n // ══════════════════════════════════════════\n\n // GET /level/[id]\n if (method === \"GET\") {\n const m = pathname.match(/^\\/level\\/([^/]+)$/);\n if (m) {\n const level = await getLevel(m[1]);\n if (!level) return notFound(\"Level not found\");\n return json(level);\n }\n }\n\n // GET /level/[id]/content\n if (method === \"GET\") {\n const m = pathname.match(/^\\/level\\/([^/]+)\\/content$/);\n if (m) {\n const content = await getLevelContent(m[1]);\n if (!content) return notFound(\"Level not found\");\n return json(content);\n }\n }\n\n // GET /level/[id]/name\n if (method === \"GET\") {\n const m = pathname.match(/^\\/level\\/([^/]+)\\/name$/);\n if (m) {\n const level = await getLevel(m[1]);\n if (!level) return notFound(\"Level not found\");\n return new Response(level.name, {\n status: 200,\n headers: { \"Content-Type\": \"text/plain; charset=utf-8\" },\n });\n }\n }\n\n // GET /level/[id]/song — convenience: redirect to the song's audio stream\n if (method === \"GET\") {\n const m = pathname.match(/^\\/level\\/([^/]+)\\/song$/);\n if (m) {\n const level = await getLevel(m[1]);\n if (!level) return notFound(\"Level not found\");\n if (!level.songId) return notFound(\"This level has no song attached\");\n const song = await getSong(level.songId);\n if (!song) return notFound(\"Referenced song not found\");\n const bytes = await getSongAudio(level.songId);\n if (!bytes) return notFound(\"Audio data not found\");\n return new Response(bytes, {\n status: 200,\n headers: { \"Content-Type\": song.mimeType },\n });\n }\n }\n\n // PUT /level/[id]\n if (method === \"PUT\") {\n const m = pathname.match(/^\\/level\\/([^/]+)$/);\n if (m) {\n const body = await req.json();\n const updated = await updateLevel(m[1], body);\n if (!updated) return notFound(\"Level not found\");\n return json(updated);\n }\n }\n\n // DELETE /level/[id]\n if (method === \"DELETE\") {\n const m = pathname.match(/^\\/level\\/([^/]+)$/);\n if (m) {\n const deleted = await deleteLevel(m[1]);\n if (!deleted) return notFound(\"Level not found\");\n return new Response(\"Level deleted\", { status: 200 });\n }\n }\n\n // GET /levels\n if (pathname === \"/levels\" && method === \"GET\") {\n const levels = await getAllLevels();\n return json(levels.map((l) => l.id));\n }\n\n // GET /levels/search\n if (pathname === \"/levels/search\" && method === \"GET\") {\n const query: SearchQuery = {};\n const name = url.searchParams.get(\"name\");\n const difficulty = url.searchParams.get(\"difficulty\") as\n | Level[\"difficulty\"]\n | null;\n const minRating = url.searchParams.get(\"minRating\");\n const maxRating = url.searchParams.get(\"maxRating\");\n const official = url.searchParams.get(\"official\");\n\n if (name) query.name = name;\n if (difficulty) query.difficulty = difficulty;\n if (minRating !== null) query.minRating = Number(minRating);\n if (maxRating !== null) query.maxRating = Number(maxRating);\n if (official !== null) query.official = official === \"true\";\n\n return json(await searchLevels(query));\n }\n\n // POST /levels — now accepts optional songId\n if (pathname === \"/levels\" && method === \"POST\") {\n const body = await req.json();\n\n if (\n !body.name || !body.difficulty || body.rating === undefined ||\n !body.content\n ) {\n return json({\n error: \"Missing required fields: name, difficulty, rating, content\",\n }, 400);\n }\n\n // Validate songId if provided\n if (body.songId) {\n const song = await getSong(body.songId);\n if (!song) {\n return json(\n { error: `Song with id '${body.songId}' not found` },\n 400,\n );\n }\n }\n\n const newLevel = await addLevel(\n body.name,\n body.difficulty,\n body.rating,\n body.content,\n body.official || false,\n body.songId,\n );\n\n return json(newLevel, 201);\n }\n\n // ── Legacy /levels/[id] routes ──────────────────────────────────────────\n\n if (method === \"GET\") {\n const m = pathname.match(/^\\/levels\\/([^/]+)$/);\n if (m) {\n const level = await getLevel(m[1]);\n if (!level) return notFound(\"Level not found\");\n return json(level);\n }\n }\n\n if (method === \"GET\") {\n const m = pathname.match(/^\\/levels\\/([^/]+)\\/content$/);\n if (m) {\n const content = await getLevelContent(m[1]);\n if (!content) return notFound(\"Level not found\");\n return json(content);\n }\n }\n\n if (method === \"PUT\") {\n const m = pathname.match(/^\\/levels\\/([^/]+)$/);\n if (m) {\n const body = await req.json();\n const updated = await updateLevel(m[1], body);\n if (!updated) return notFound(\"Level not found\");\n return json(updated);\n }\n }\n\n if (method === \"DELETE\") {\n const m = pathname.match(/^\\/levels\\/([^/]+)$/);\n if (m) {\n const deleted = await deleteLevel(m[1]);\n if (!deleted) return notFound(\"Level not found\");\n return new Response(\"Level deleted\", { status: 200 });\n }\n }\n\n return new Response(\"Not found\", { status: 404 });\n } catch (error) {\n console.error(\"Error:\", error);\n return json({\n error: \"Internal server error\",\n message: error instanceof Error ? error.message : \"Unknown error\",\n }, 500);\n }\n}\n\n// ─────────────────────────────────────────────\n// Small helpers\n// ─────────────────────────────────────────────\n\nfunction json(data: unknown, status = 200): Response {\n return new Response(JSON.stringify(data), {\n status,\n headers: { \"Content-Type\": \"application/json\" },\n });\n}\n\nfunction notFound(msg: string): Response {\n return new Response(msg, { status: 404 });\n}\n\nexport type { Level, SearchQuery, Song 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Diff · v20