import FolderViewMode from '../../models/FolderViewMode'
import Folder from '../../models/Folder'
import FolderService from './service'
import Item from '../../models/Item'
import {_} from '../../utilities/messages'

export default class FolderPresenter {
	private readonly folderService = new FolderService()

	private async getCommonProps(folderId: string) {
		return Promise.all([
			this.folderService.getHierarchy(folderId),
			this.folderService.getChildren(folderId),
			this.folderService.getItems(folderId),
		])
	}

	async getRootFolderViewState({ session, query, mode, }) {
		// TODO make this authentication checking more like a middleware.
		if (!session) {
			return {
				redirect: {
					url: new URL('/', process.env.BASE_URL)
				},
			}
		}

		const folderId = session.user.rootFolder.id
		const [hierarchy, children, items] = await this.getCommonProps(folderId)
		return {
			body: {
				data: {
					query,
					mode,
					items: items.map(Item.formatForView),
					children: children.map(c => Folder.formatForView(c)),
					hierarchy: hierarchy.map(h => Folder.formatForView(h)),
				},
			},
		}
	}

	async getDescendantFolderViewState({ session, query, mode, id, }) {
		// TODO make this authentication checking more like a middleware.
		if (!session) {
			return {
				redirect: {
					url: new URL('/', process.env.BASE_URL)
				},
			}
		}

		const folderId = id as string
		const [hierarchy, children, items] = await this.getCommonProps(folderId)
		return {
			body: {
				data: {
					query,
					mode,
					items: items.map(Item.formatForView),
					children: children.map(Folder.formatForView),
					hierarchy: hierarchy.map(Folder.formatForView),
				},
			},
		}
	}

	async getFolder({ id }) {
		try {
			const data = await this.folderService.get(id)
			// TODO compute owner of folder by getting the root folder
			if (data) {
				return {
					status: 200,
					title: _('FOLDER_FOUND_TITLE'),
					body: {
						description: _('FOLDER_FOUND_DESCRIPTION'),
						data,
					},
				}
			}
			return {
				status: 404,
				title: _('FOLDER_NOT_FOUND_TITLE'),
				body: {
					description: _('FOLDER_NOT_FOUND_DESCRIPTION'),
				},
			}
		} catch {
			return {
				status: 500,
				title: _('ERROR_RETRIEVING_FOLDER_TITLE'),
				body: {
					description: _('ERROR_RETRIEVING_FOLDER_DESCRIPTION'),
				},
			}
		}
	}

	async createFolder({ name, parentId, origin = null }) {
		try {
			const newFolder = await this.folderService.create(name, parentId)
			return {
				status: 201,
				title: _('FOLDER_CREATED_TITLE'),
				body: {
					description: _('FOLDER_CREATED_DESCRIPTION'),
					data: newFolder,
				},
				redirect: {
					url: new URL(`/my/folders/${newFolder.id}`, process.env.BASE_URL),
				},
			}
		} catch {
			return {
				status: 500,
				title: _('ERROR_CREATING_FOLDER_TITLE'),
				body: {
					description: _('ERROR_CREATING_FOLDER_DESCRIPTION'),
				},
				redirect: {
					url: new URL(origin),
				},
			}
		}
	}

	generateRedirectToCreateFolder({ sourceURL, }) {
		const url = sourceURL ? new URL(sourceURL) : new URL('/my/folders', process.env.BASE_URL)
		const search = Object.fromEntries(url.searchParams.entries())

		url.search = new URLSearchParams({
			...search,
			'mode': FolderViewMode.NEW_FOLDER,
		}).toString()

		return {
			redirect: {
				url
			}
		}
	}
}