import { createSelector } from 'reselect';
import { parseQueryParams } from 'util/query_params';
import lbryuri from 'lbryuri';

export const _selectState = state => state.app || {};

export const selectIsLoaded = createSelector(
	_selectState,
	state => state.isLoaded
);

export const selectCurrentPath = createSelector(
	_selectState,
	state => state.currentPath
);

export const selectCurrentPage = createSelector(selectCurrentPath, path => {
	return path.replace(/^\//, '').split('?')[0];
});

export const selectCurrentParams = createSelector(selectCurrentPath, path => {
	if (path === undefined) return {};
	if (!path.match(/\?/)) return {};

	return parseQueryParams(path.split('?')[1]);
});

export const selectPageTitle = createSelector(
	selectCurrentPage,
	selectCurrentParams,
	(page, params) => {
		switch (page) {
			case 'settings':
			case 'help':
			case 'report':
			case 'wallet':
			case 'send':
			case 'receive':
			case 'rewards':
			case 'start':
			case 'publish':
			case 'help':
			case 'developer':
				return __(page.charAt(0).toUpperCase() + page.slice(1));
			case 'search':
				return params.query
					? __('Search results for %s', params.query)
					: __('Search');
			case 'show':
				return lbryuri.normalize(params.uri);
			case 'downloaded':
				return __('Downloads & Purchases');
			case 'published':
				return __('Publishes');
			case 'discover':
				return __('Home');
			default:
				return '';
		}
	}
);

export const selectPlatform = createSelector(
	_selectState,
	state => state.platform
);

export const selectUpdateUrl = createSelector(selectPlatform, platform => {
	switch (platform) {
		case 'darwin':
			return 'https://lbry.io/get/lbry.dmg';
		case 'linux':
			return 'https://lbry.io/get/lbry.deb';
		case 'win32':
			return 'https://lbry.io/get/lbry.exe';
		default:
			throw 'Unknown platform';
	}
});

export const selectVersion = createSelector(_selectState, state => {
	return state.version;
});

export const selectUpgradeFilename = createSelector(
	selectPlatform,
	selectVersion,
	(platform, version) => {
		switch (platform) {
			case 'darwin':
				return `LBRY_${version}.dmg`;
			case 'linux':
				return `LBRY_${version}_amd64.deb`;
			case 'win32':
				return `LBRY_${version}.exe`;
			default:
				throw 'Unknown platform';
		}
	}
);

export const selectCurrentModal = createSelector(
	_selectState,
	state => state.modal
);

export const selectDownloadProgress = createSelector(
	_selectState,
	state => state.downloadProgress
);

export const selectDownloadComplete = createSelector(
	_selectState,
	state => state.upgradeDownloadCompleted
);

export const selectHeaderLinks = createSelector(selectCurrentPage, page => {
	switch (page) {
		case 'wallet':
		case 'send':
		case 'receive':
		case 'rewards':
			return {
				wallet: __('Overview'),
				send: __('Send'),
				receive: __('Receive'),
				rewards: __('Rewards')
			};
		case 'downloaded':
		case 'published':
			return {
				downloaded: __('Downloaded'),
				published: __('Published')
			};
		case 'settings':
		case 'help':
			return {
				settings: __('Settings'),
				help: __('Help')
			};
		default:
			return null;
	}
});

export const selectUpgradeSkipped = createSelector(
	_selectState,
	state => state.upgradeSkipped
);

export const selectUpgradeDownloadPath = createSelector(
	_selectState,
	state => state.downloadPath
);

export const selectUpgradeDownloadItem = createSelector(
	_selectState,
	state => state.downloadItem
);

export const selectModalExtraContent = createSelector(
	_selectState,
	state => state.modalExtraContent
);

export const selectDaemonReady = createSelector(
	_selectState,
	state => state.daemonReady
);

export const selectObscureNsfw = createSelector(
	_selectState,
	state => !!state.obscureNsfw
);

export const selectSnackBar = createSelector(
	_selectState,
	state => state.snackBar || {}
);

export const selectSnackBarSnacks = createSelector(
	selectSnackBar,
	snackBar => snackBar.snacks || []
);