/**
 * WordPress dependencies
 */
import { _x } from '@safe-wordpress/i18n';

/**
 * External dependencies
 */
import { isEqual, trim } from 'lodash';
import type { Maybe, PostStatus, PostStatusSlug } from '@nelio-content/types';

/**
 * Internal dependencies
 */
import type { State } from './types';

export function getStatuses( state: State ): ReadonlyArray< PostStatusSlug > {
	return state.statuses.allSlugs;
}

export function getStatus(
	state: State,
	slug: Maybe< PostStatusSlug >
): Maybe< PostStatus > {
	return slug ? state.statuses.bySlug[ slug ] : undefined;
}

export function isStatusEditorOpen( state: State ): boolean {
	return !! state.editor;
}

export function getEditingStatus( state: State ): PostStatus {
	return state.editor?.attrs || DEFAULT_ATTRS;
}

export function isEditingStatusDirty( state: State ): boolean {
	if ( ! state.editor ) {
		return false;
	}

	const { source } = state.editor;
	const attrs = {
		...state.editor.attrs,
	};
	return ! isEqual( source, attrs );
}

export function isEditingStatusNew( state: State ): boolean {
	if ( ! state.editor ) {
		return false;
	}

	return state.editor.isNew;
}

export function getEditingStatusError( state: State ): Maybe< string > {
	if ( ! state.editor ) {
		return undefined;
	}

	const { attrs } = state.editor;
	if ( trim( attrs.slug ) === '' ) {
		return _x( 'Please write a valid slug', 'user', 'nelio-content' );
	}

	if ( trim( attrs.slug ).length > 20 ) {
		return _x( 'Please write a shorter slug', 'user', 'nelio-content' );
	}

	if (
		state.editor.source.slug !== trim( attrs.slug ) &&
		state.statuses.allSlugs.includes( trim( attrs.slug ) )
	) {
		return _x(
			'There is another status with the same slug',
			'user',
			'nelio-content'
		);
	}

	if ( attrs.postTypes !== 'all-types' && ! attrs.postTypes.length ) {
		return _x(
			'Please select at least one post type',
			'user',
			'nelio-content'
		);
	}

	if ( attrs.roles !== 'all-roles' && ! attrs.roles.length ) {
		return _x( 'Please select at least one role', 'user', 'nelio-content' );
	}

	if (
		trim( state.editor.source.slug ) === '' &&
		state.statuses.allSlugs.includes( trim( attrs.slug ) )
	) {
		return _x(
			'There is another status with the same slug',
			'user',
			'nelio-content'
		);
	}

	if ( trim( attrs.name ) === '' ) {
		return _x(
			'Please write a valid status label',
			'user',
			'nelio-content'
		);
	}

	return undefined;
}

export function isSavingStatuses( state: State ): boolean {
	return state.saving;
}

// =======
// HELPERS
// =======

const DEFAULT_ATTRS: PostStatus = {
	slug: '' as PostStatusSlug,
	name: 'none',
	available: true,
	postTypes: 'all-types',
	roles: 'all-roles',
};