import { __ } from '@wordpress/i18n'
import { useSnippetsAPI } from '../../../hooks/useSnippetsAPI'
import { useSnippetsList } from '../../../hooks/useSnippetsList'
import { handleUnknownError } from '../../../utils/errors'
import { downloadBulkSnippetExportFile } from '../../../utils/files'
import { cloneSnippetObject } from '../../../utils/snippets/snippets'
import type { ListTableAction } from '../../common/ListTable'
import type { Snippet } from '../../../types/Snippet'

export type SnippetsTableAction =
	'activate' | 'deactivate' |
	'clone' | 'export' | 'download' |
	'trash' | 'restore' | 'delete'

export const BULK_ACTIONS: ListTableAction<SnippetsTableAction>[] = [
	{ key: 'activate', label: __('Activate', 'code-snippets') },
	{ key: 'deactivate', label: __('Deactivate', 'code-snippets') },
	{ key: 'clone', label: __('Clone', 'code-snippets') },
	{ key: 'export', label: __('Export', 'code-snippets') },
	{ key: 'download', label: __('Download', 'code-snippets') },
	{ key: 'trash', label: __('Trash', 'code-snippets') }
]

export const TRASHED_BULK_ACTIONS: ListTableAction<SnippetsTableAction>[] = [
	{ key: 'restore', label: __('Restore', 'code-snippets') },
	{ key: 'delete', label: __('Delete Permanently', 'code-snippets') }
]

const BULK_DOWNLOAD_ACTION = 'bulk-download'
const INDIVIDUAL_DOWNLOAD_DELAY_MS = 200

const submitBulkSnippetDownload = (snippets: readonly Snippet[]): Promise<void> => {
	if (0 === snippets.length) {
		return Promise.resolve()
	}

	const form = document.createElement('form')

	const appendHiddenField = (name: string, value: string) => {
		const input = document.createElement('input')
		input.type = 'hidden'
		input.name = name
		input.value = value
		form.appendChild(input)
	}

	form.method = 'post'
	form.action = window.location.href
	form.hidden = true

	appendHiddenField('code_snippets_action', BULK_DOWNLOAD_ACTION)
	appendHiddenField('code_snippets_bulk_download_nonce', window.CODE_SNIPPETS_MANAGE?.bulkDownloadNonce ?? '')
	appendHiddenField(
		'snippets',
		JSON.stringify(snippets.map(({ id, network }) => ({ id, network })))
	)

	document.body.appendChild(form)
	form.submit()

	window.setTimeout(() => {
		form.remove()
	}, 0)

	return Promise.resolve()
}

const submitBulkSnippetDownloadsIndividually = (snippets: readonly Snippet[]): Promise<void> =>
	snippets.reduce(
		(promise, snippet) =>
			promise.then(
				() =>
					new Promise<void>(resolve => {
						void submitBulkSnippetDownload([snippet])
						window.setTimeout(resolve, INDIVIDUAL_DOWNLOAD_DELAY_MS)
					})
			),
		Promise.resolve()
	)

const applyAndRefresh = async (
	targets: Snippet[],
	action: (snippet: Snippet) => Promise<Snippet> | Promise<void>,
	refresh: () => Promise<void>
): Promise<void> => {
	if (0 < targets.length) {
		for (const snippet of targets) {
			await action(snippet).catch(handleUnknownError)
		}

		await refresh()
	}
}

export const useApplyBulkAction = (
	allSnippets: Snippet[]
): (action: SnippetsTableAction | undefined, selected: Set<Snippet['id']>) => Promise<void> => {
	const api = useSnippetsAPI()
	const { refreshSnippetsList } = useSnippetsList()

	return async (action, selected) => {
		switch (action) {
			case 'activate':
				await applyAndRefresh(
					allSnippets.filter(snippet => selected.has(snippet.id) && !snippet.active),
					snippet => api.activate({ id: snippet.id, network: snippet.network }),
					refreshSnippetsList)
				break

			case 'deactivate':
				await applyAndRefresh(
					allSnippets.filter(snippet => selected.has(snippet.id) && snippet.active),
					snippet => api.deactivate({ id: snippet.id, network: snippet.network }),
					refreshSnippetsList)
				break

			case 'clone':
				await applyAndRefresh(
					allSnippets.filter(snippet => selected.has(snippet.id) && !snippet.trashed),
					snippet => api.create(cloneSnippetObject(snippet)),
					refreshSnippetsList)
				break

			case 'export':
				downloadBulkSnippetExportFile(allSnippets.filter(snippet => selected.has(snippet.id)))
				break

			case 'download': {
				const selectedSnippets = allSnippets.filter(snippet => selected.has(snippet.id))

				return 1 < selectedSnippets.length && !window.CODE_SNIPPETS_MANAGE?.supportsZipDownloads
					? submitBulkSnippetDownloadsIndividually(selectedSnippets)
					: submitBulkSnippetDownload(selectedSnippets)
			}

			case 'trash':
			case 'delete':
				await applyAndRefresh(
					allSnippets.filter(snippet => selected.has(snippet.id)),
					snippet => api.delete({ id: snippet.id, network: snippet.network }),
					refreshSnippetsList)
				break

			case undefined:
				break
		}
	}
}