import { dropLast, last, pipe, propEq, range, take } from 'ramda'
import { coerceArray } from '../utils'
import { EvaluatedRule, ParsedRule, ParsedRules, Rule, Rules } from './types'

export const splitName = str => str.split(' . ')
export const joinName = strs => strs.join(' . ')
export const parentName = pipe(
	splitName,
	dropLast(1) as (a: string[]) => string[],
	joinName
)
export const nameLeaf = pipe(splitName, last)
export const encodeRuleName = name =>
	encodeURI(
		name
			.replace(/\s\.\s/g, '/')
			.replace(/-/g, '\u2011') // replace with a insecable tiret to differenciate from space
			.replace(/\s/g, '-')
	)
export let decodeRuleName = name =>
	decodeURI(
		name
			.replace(/\//g, ' . ')
			.replace(/-/g, ' ')
			.replace(/\u2011/g, '-')
	)
export function ruleParents<Names extends string>(
	dottedName: Names
): Array<Names> {
	let fragments = splitName(dottedName) // dottedName ex. [CDD . événements . rupture]
	return range(1, fragments.length)
		.map(nbEl => take(nbEl, fragments))
		.map(joinName) //  -> [ [CDD . événements . rupture], [CDD . événements], [CDD
		.reverse()
}

export function disambiguateRuleReference<Names extends string>(
	rules: Rules<Names>,
	contextName: Names,
	partialName: string
) {
	const possibleDottedName = [
		contextName,
		...ruleParents(contextName),
		''
	].map(x => (x ? x + ' . ' + partialName : partialName))
	const dottedName = possibleDottedName.find(name => name in rules)
	if (!dottedName) {
		throw new Error(`La référence '${partialName}' est introuvable.
	Vérifiez que l'orthographe et l'espace de nom sont corrects`)
	}
	return dottedName
}

type DefaultValues<Names extends string> = { [name in Names]: any } | {}
export function collectDefaults<Names extends string>(
	parsedRules: ParsedRules<Names>
): DefaultValues<Names> {
	return (Object.values(parsedRules) as Array<ParsedRule<Names>>).reduce(
		(acc, parsedRule) =>
			parsedRule?.defaultValue != null
				? {
						...acc,
						[parsedRule.dottedName]: parsedRule.defaultValue
				  }
				: acc,
		{}
	)
}

/*********************************
 Autres 
 */

export function findParentDependencies<Names extends string>(
	rules: Rules<Names>,
	name: Names
): Array<Names> {
	// A parent dependency means that one of a rule's parents is not just a namespace holder, it is a boolean question. E.g. is it a fixed-term contract, yes / no
	// When it is resolved to false, then the whole branch under it is disactivated (non applicable)
	// It lets those children omit obvious and repetitive parent applicability tests
	return ruleParents(name)
		.map(parent => [parent, rules[parent]] as [Names, Rule])
		.filter(([_, rule]) => !!rule)
		.filter(
			([_, { question, unité, formule }]) =>
				//Find the first "calculable" parent
				(question && !unité && !formule) ||
				(question && formule?.['une possibilité'] !== undefined) ||
				(typeof formule === 'string' && formule.includes(' = ')) ||
				formule === 'oui' ||
				formule === 'non' ||
				formule?.['une de ces conditions'] ||
				formule?.['toutes ces conditions']
		)
		.map(([name, _]) => name)
}

export let getRuleFromAnalysis = analysis => <Names extends string>(
	dottedName: Names
): EvaluatedRule<Names> => {
	if (!analysis) {
		throw new Error("[getRuleFromAnalysis] The analysis can't be nil !")
	}

	let rule = coerceArray(analysis) // In some simulations, there are multiple "branches" : the analysis is run with e.g. 3 different input situations
		.map(
			analysis =>
				analysis.cache[dottedName]?.explanation || // the cache stores a reference to a variable, the variable is contained in the 'explanation' attribute
				analysis.targets.find(propEq('dottedName', dottedName))
		)
		.filter(Boolean)[0]
	if (process.env.NODE_ENV !== 'production' && !rule) {
		console.warn(`[getRuleFromAnalysis] Unable to find the rule ${dottedName}`)
	}

	return rule
}