import path from 'path'
import fs from 'fs/promises'
import { getDb, ensureReady } from './db'

export type FileType = 'backerup' | 'config'

export interface FileRecord {
  token: string
  originalName: string
  displayName?: string
  size: number
  type: FileType
  uploadedAt: string
  description?: string
  group?: string
  containerName?: string
  image?: string
}

const DATA_DIR = path.join(process.cwd(), 'data')
const UPLOADS_DIR = path.join(DATA_DIR, 'uploads')

type DbRow = Record<string, unknown>

function rowToRecord(row: DbRow): FileRecord {
  return {
    token: row.token as string,
    originalName: row.original_name as string,
    displayName: (row.display_name as string | null) ?? undefined,
    size: row.size as number,
    type: row.type as FileType,
    uploadedAt: row.uploaded_at as string,
    description: (row.description as string | null) ?? undefined,
    group: (row.group_name as string | null) ?? undefined,
    containerName: (row.container_name as string | null) ?? undefined,
    image: (row.image as string | null) ?? undefined,
  }
}

export async function readMeta(): Promise<FileRecord[]> {
  await ensureReady()
  const { rows } = await getDb().execute(
    'SELECT * FROM files ORDER BY uploaded_at DESC',
  )
  return rows.map(rowToRecord)
}

export async function listGroups(): Promise<string[]> {
  await ensureReady()
  const { rows } = await getDb().execute(
    'SELECT DISTINCT group_name FROM files WHERE group_name IS NOT NULL ORDER BY group_name',
  )
  return rows.map((r) => r.group_name as string)
}

export async function addFile(record: FileRecord, buffer: Buffer): Promise<void> {
  await ensureReady()
  await fs.mkdir(UPLOADS_DIR, { recursive: true })
  const dir = path.join(UPLOADS_DIR, record.token)
  await fs.mkdir(dir, { recursive: true })
  await fs.writeFile(path.join(dir, record.originalName), buffer)

  await getDb().execute({
    sql: `INSERT INTO files
          (token,original_name,display_name,size,type,uploaded_at,description,group_name,container_name,image)
          VALUES (?,?,?,?,?,?,?,?,?,?)`,
    args: [
      record.token,
      record.originalName,
      record.displayName ?? null,
      record.size,
      record.type,
      record.uploadedAt,
      record.description ?? null,
      record.group ?? null,
      record.containerName ?? null,
      record.image ?? null,
    ],
  })
}

export async function getFile(token: string): Promise<FileRecord | undefined> {
  await ensureReady()
  const { rows } = await getDb().execute({
    sql: 'SELECT * FROM files WHERE token = ?',
    args: [token],
  })
  return rows[0] ? rowToRecord(rows[0]) : undefined
}

export function getUploadPath(token: string, originalName: string): string {
  return path.join(UPLOADS_DIR, token, originalName)
}