import type { UnloaderPlugin, UnpluginContextMeta, UnpluginFactory, UnpluginInstance } from '../types'

import { version as unpluginVersion } from '../../package.json'

import { toRollupPlugin } from '../rollup'

import { toArray } from '../utils/general'

export function getUnloaderPlugin<UserOptions = Record<string, never>, Nested extends boolean = boolean>(

factory: UnpluginFactory<UserOptions, Nested>,

) {

return ((userOptions?: UserOptions) => {

const meta: UnpluginContextMeta = {

framework: 'unloader',

versions: { unplugin: unpluginVersion }, // Will be populated in buildStart hook

}

const rawPlugins = toArray(factory(userOptions!, meta))

const plugins = rawPlugins.map((rawPlugin) => {

const plugin = toRollupPlugin(rawPlugin, 'unloader', meta) as UnloaderPlugin

return plugin

})

return plugins.length === 1 ? plugins[0] : plugins

}) as UnpluginInstance<UserOptions, Nested>['unloader']

}