mon-entreprise/source/engine/mecanisms.tsx

import { decompose } from 'Engine/mecanisms/utils'
import variations from 'Engine/mecanisms/variations'
import { convertNodeToUnit } from 'Engine/nodeUnits'
import {
	areUnitConvertible,
	convertUnit,
	inferUnit,
	serializeUnit
} from 'Engine/units'
import {
	any,
	equals,
	is,
	map,
	max,
	mergeWith,
	min,
	path,
	pluck,
	reduce
} from 'ramda'
import React from 'react'
import { typeWarning } from './error'
import {
	collectNodeMissing,
	defaultNode,
	evaluateArray,
	evaluateNode,
	evaluateObject,
	makeJsx,
	mergeAllMissing,
	parseObject
} from './evaluation'
import Allègement from './mecanismViews/Allègement'
import { Node, SimpleRuleLink } from './mecanismViews/common'
import InversionNumérique from './mecanismViews/InversionNumérique'
import Product from './mecanismViews/Product'
import Recalcul from './mecanismViews/Recalcul'
import Somme from './mecanismViews/Somme'
import uniroot from './uniroot'
import { parseUnit } from './units'
import { EvaluatedRule } from './types'

export let mecanismOneOf = (recurse, k, v) => {
	if (!is(Array, v)) throw new Error('should be array')

	let explanation = map(recurse, v)

	let jsx = ({ nodeValue, explanation, unit }) => (
		<Node
			classes="mecanism conditions list"
			name="une de ces conditions"
			value={nodeValue}
			unit={unit}
		>
			<ul>
				{explanation.map((item, i) => (
					<li key={i}>{makeJsx(item)}</li>
				))}
			</ul>
		</Node>
	)

	let evaluate = (cache, situationGate, parsedRules, node) => {
		let evaluateOne = child =>
				evaluateNode(cache, situationGate, parsedRules, child),
			explanation = map(evaluateOne, node.explanation),
			values = pluck('nodeValue', explanation),
			nodeValue = any(equals(true), values)
				? true
				: any(equals(null), values)
				? null
				: false,
			// Unlike most other array merges of missing variables this is a "flat" merge
			// because "one of these conditions" tend to be several tests of the same variable
			// (e.g. contract type is one of x, y, z)
			missingVariables =
				nodeValue == null
					? reduce(mergeWith(max), {}, map(collectNodeMissing, explanation))
					: {}

		return { ...node, nodeValue, explanation, missingVariables }
	}

	return {
		evaluate,
		jsx,
		explanation,
		category: 'mecanism',
		name: 'une de ces conditions',
		type: 'boolean'
	}
}

export let mecanismAllOf = (recurse, k, v) => {
	if (!is(Array, v)) throw new Error('should be array')

	let explanation = map(recurse, v)

	let jsx = ({ nodeValue, explanation, unit }) => (
		<Node
			classes="mecanism conditions list"
			name="toutes ces conditions"
			value={nodeValue}
			unit={unit}
		>
			<ul>
				{explanation.map((item, i) => (
					<li key={i}>{makeJsx(item)}</li>
				))}
			</ul>
		</Node>
	)

	let evaluate = (cache, situationGate, parsedRules, node) => {
		let evaluateOne = child =>
				evaluateNode(cache, situationGate, parsedRules, child),
			explanation = map(evaluateOne, node.explanation),
			values = pluck('nodeValue', explanation),
			nodeValue = any(equals(false), values)
				? false // court-circuit
				: any(equals(null), values)
				? null
				: true,
			missingVariables = nodeValue == null ? mergeAllMissing(explanation) : {}

		return { ...node, nodeValue, explanation, missingVariables }
	}

	return {
		evaluate: evaluate,
		jsx,
		explanation,
		category: 'mecanism',
		name: 'toutes ces conditions',
		type: 'boolean'
	}
}

let evaluateInversion = (oldCache, situationGate, parsedRules, node) => {
	// TODO : take applicability into account here
	let inversedWith = node.explanation.inversionCandidates.find(
		n => situationGate(n.dottedName) != undefined
	)
	if (!inversedWith) {
		return {
			...node,
			missingVariables: {
				...Object.fromEntries(
					node.explanation.inversionCandidates.map(n => [n.dottedName, 1])
				),
				[node.explanation.ruleToInverse]: 1
			},
			nodeValue: null
		}
	}
	inversedWith = evaluateNode(
		oldCache,
		situationGate,
		parsedRules,
		inversedWith
	)

	let inversionCache
	function resetInversionCache() {
		inversionCache = {
			_meta: { ...oldCache._meta }
		}
		return inversionCache
	}
	const evaluateWithValue = n =>
		evaluateNode(
			resetInversionCache(),
			dottedName =>
				dottedName === node.explanation.ruleToInverse
					? {
							nodeValue: n,
							unit: parsedRules[node.explanation.ruleToInverse].unit
					  }
					: dottedName === inversedWith.dottedName
					? undefined
					: situationGate(dottedName),
			parsedRules,
			inversedWith
		)

	// si fx renvoie null pour une valeur numérique standard, disons 2000, on peut
	// considérer que l'inversion est impossible du fait de variables manquantes
	// TODO fx peut être null pour certains x, et valide pour d'autres : on peut implémenter ici le court-circuit
	const randomAttempt = evaluateWithValue(2000)
	const nodeValue =
		randomAttempt.nodeValue === null
			? null
			: // cette fonction détermine l'inverse d'une fonction sans faire trop d'itérations
			  uniroot(
					x => {
						const candidateNode = evaluateWithValue(x)
						return (
							candidateNode.nodeValue -
							// TODO: convertNodeToUnit migth return null or false
							(convertNodeToUnit(candidateNode.unit, inversedWith)
								.nodeValue as number)
						)
					},
					node.explanation.negativeValuesAllowed ? -1000000 : 0,
					100000000,
					0.1,
					10
			  )

	if (nodeValue === undefined) {
		oldCache._meta.inversionFail = true
	} else {
		// For performance reason, we transfer the inversion cache
		Object.entries(inversionCache).forEach(([k, value]) => {
			oldCache[k] = value
		})
	}

	return {
		...node,
		nodeValue: nodeValue ?? null,
		explanation: {
			...node.explanation,
			inversionFail: nodeValue === undefined,
			inversedWith
		},
		missingVariables: randomAttempt.missingVariables
	}
}

export let mecanismInversion = dottedName => (recurse, k, v) => {
	if (!v.avec) {
		throw new Error(
			"Une formule d'inversion doit préciser _avec_ quoi on peut inverser la variable"
		)
	}
	return {
		evaluate: evaluateInversion,
		unit: v.unité && parseUnit(v.unité),
		explanation: {
			ruleToInverse: dottedName,
			inversionCandidates: v.avec.map(recurse),
			negativeValuesAllowed: v['valeurs négatives possibles'] === 'oui'
		},
		jsx: InversionNumérique,
		category: 'mecanism',
		name: 'inversion numérique',
		type: 'numeric'
	}
}

export let mecanismRecalcul = dottedNameContext => (recurse, k, v) => {
	let evaluate = (cache, situationGate, parsedRules, node) => {
		if (cache._meta.inRecalcul) {
			return defaultNode(false)
		}
		const recalculCache = { _meta: { ...cache._meta, inRecalcul: true } } // Create an empty cache
		const amendedSituation = map(
			value => evaluateNode(cache, situationGate, parsedRules, value),
			node.explanation.amendedSituation
		)
		const amendedSituationGate = dottedName => {
			if (!(dottedName in amendedSituation)) {
				return situationGate(dottedName)
			}
			return amendedSituation[dottedName]
		}

		const evaluatedNode = evaluateNode(
			recalculCache,
			amendedSituationGate,
			parsedRules,
			node.explanation.recalcul
		)

		return {
			...node,
			nodeValue: evaluatedNode.nodeValue,
			...(evaluatedNode.temporalValue && {
				temporalValue: evaluatedNode.temporalValue
			}),
			unit: evaluatedNode.unit,
			explanation: {
				recalcul: evaluatedNode,
				amendedSituation
			}
		}
	}

	const amendedSituation = Object.fromEntries(
		Object.keys(v.avec).map(dottedName => [
			recurse(dottedName).dottedName,
			recurse(v.avec[dottedName])
		])
	)
	const defaultRuleToEvaluate = dottedNameContext
	const nodeToEvaluate = recurse(v.règle ?? defaultRuleToEvaluate)
	return {
		explanation: {
			recalcul: nodeToEvaluate,
			amendedSituation
		},
		jsx: Recalcul,
		evaluate
	}
}

export let mecanismSum = (recurse, k, v) => {
	let explanation = v.map(recurse)

	let evaluate = evaluateArray(
		(x, y) => (x === false && y === false ? false : x + y),
		false
	)

	return {
		evaluate,
		// eslint-disable-next-line
		jsx: ({ nodeValue, explanation, unit }: EvaluatedRule) => (
			<Somme nodeValue={nodeValue} explanation={explanation} unit={unit} />
		),
		explanation,
		category: 'mecanism',
		name: 'somme',
		type: 'numeric',
		unit: inferUnit(
			'+',
			explanation.map(r => r.unit)
		)
	}
}

export let mecanismReduction = (recurse, k, v) => {
	let objectShape = {
		assiette: false,
		abattement: defaultNode(0),
		plafond: defaultNode(Infinity),
		franchise: defaultNode(0)
	}

	let effect = (
		{ assiette, abattement, plafond, franchise, décote },
		cache
	) => {
		let v_assiette = assiette.nodeValue
		if (v_assiette == null) return { nodeValue: null }
		if (assiette.unit) {
			try {
				franchise = convertNodeToUnit(assiette.unit, franchise)
				plafond = convertNodeToUnit(assiette.unit, plafond)
				if (serializeUnit(abattement.unit) !== '%') {
					abattement = convertNodeToUnit(assiette.unit, abattement)
				}
				if (décote) {
					décote.plafond = convertNodeToUnit(assiette.unit, décote.plafond)
					décote.taux = convertNodeToUnit(parseUnit(''), décote.taux)
				}
			} catch (e) {
				typeWarning(
					cache._meta.contextRule,
					"Impossible de convertir les unités de l'allègement entre elles",
					e
				)
			}
		}
		let montantFranchiséDécoté =
			franchise.nodeValue && v_assiette < franchise.nodeValue
				? 0
				: décote
				? (function() {
						let plafondDécote = décote.plafond.nodeValue,
							taux = décote.taux.nodeValue

						return v_assiette > plafondDécote
							? v_assiette
							: max(0, (1 + taux) * v_assiette - taux * plafondDécote)
				  })()
				: v_assiette
		const nodeValue = abattement
			? abattement.nodeValue == null
				? montantFranchiséDécoté === 0
					? 0
					: null
				: serializeUnit(abattement.unit) === '%'
				? max(
						0,
						montantFranchiséDécoté -
							min(
								plafond.nodeValue,
								(abattement.nodeValue / 100) * montantFranchiséDécoté
							)
				  )
				: max(
						0,
						montantFranchiséDécoté -
							min(plafond.nodeValue, abattement.nodeValue)
				  )
			: montantFranchiséDécoté
		return {
			nodeValue,
			unit: assiette.unit,
			explanation: {
				franchise,
				plafond,
				abattement
			}
		}
	}

	let base = parseObject(recurse, objectShape, v),
		explanation = v.décote
			? {
					...base,
					décote: map(recurse, v.décote)
			  }
			: base,
		evaluate = evaluateObject(objectShape, effect)

	return {
		evaluate,
		jsx: Allègement,
		explanation,
		category: 'mecanism',
		name: 'allègement',
		type: 'numeric',
		unit: explanation?.assiette?.unit
	}
}

export let mecanismProduct = (recurse, k, v) => {
	if (v.composantes) {
		//mécanisme de composantes. Voir mécanismes.md/composantes
		return decompose(recurse, k, v)
	}
	if (v.variations) {
		return variations(recurse, k, v, true)
	}

	let objectShape = {
		assiette: false,
		taux: defaultNode(1),
		facteur: defaultNode(1),
		plafond: defaultNode(Infinity)
	}
	let effect = ({ assiette, taux, facteur, plafond }, cache) => {
		if (assiette.unit) {
			try {
				plafond = convertNodeToUnit(assiette.unit, plafond)
			} catch (e) {
				typeWarning(
					cache._meta.contextRule,
					"Impossible de convertir l'unité du plafond du produit dans celle de l'assiette",
					e
				)
			}
		}
		const mult = (base, rate, facteur, plafond) =>
			Math.min(base, plafond === false ? Infinity : plafond) * rate * facteur

		let nodeValue = [taux, assiette, facteur].some(n => n.nodeValue === false)
			? false
			: [taux, assiette, facteur].some(n => n.nodeValue === 0)
			? 0
			: [taux, assiette, facteur].some(n => n.nodeValue === null)
			? null
			: mult(
					assiette.nodeValue,
					taux.nodeValue,
					facteur.nodeValue,
					plafond.nodeValue
			  )

		let unit = inferUnit(
			'*',
			[assiette, taux, facteur].map(el => el.unit)
		)
		if (areUnitConvertible(unit, assiette.unit)) {
			nodeValue = convertUnit(unit, assiette.unit, nodeValue)
			unit = assiette.unit
		}
		return {
			nodeValue,

			unit,
			explanation: {
				plafondActif: assiette.nodeValue > plafond.nodeValue
			}
		}
	}

	let explanation = parseObject(recurse, objectShape, v),
		evaluate = evaluateObject(objectShape, effect)

	return {
		evaluate,
		jsx: Product,
		explanation,
		category: 'mecanism',
		name: 'produit',
		type: 'numeric',
		unit: inferUnit(
			'*',
			[explanation.assiette, explanation.taux, explanation.facteur].map(
				el => el.unit
			)
		)
	}
}

export let mecanismMax = (recurse, k, v) => {
	let explanation = v.map(recurse)

	const max = (a, b) => {
		if (a === false) {
			return b
		}
		if (b === false) {
			return a
		}
		if (a === null || b === null) {
			return null
		}
		return Math.max(a, b)
	}
	let evaluate = evaluateArray(max, Number.NEGATIVE_INFINITY)

	let jsx = ({ nodeValue, explanation, unit }) => (
		<Node
			classes="mecanism list maximum"
			name="le maximum de"
			value={nodeValue}
			unit={unit}
		>
			<ul>
				{explanation.map((item, i) => (
					<li key={i}>
						<div className="description">{v[i].description}</div>
						{makeJsx(item)}
					</li>
				))}
			</ul>
		</Node>
	)

	return {
		evaluate,
		jsx,
		explanation,
		type: 'numeric',
		category: 'mecanism',
		name: 'le maximum de',
		unit: explanation[0].unit
	}
}

export let mecanismMin = (recurse, k, v) => {
	let explanation = v.map(recurse)

	let evaluate = evaluateArray(min, Infinity)

	let jsx = ({ nodeValue, explanation, unit }) => (
		<Node
			classes="mecanism list minimum"
			name="le minimum de"
			value={nodeValue}
			unit={unit}
		>
			<ul>
				{explanation.map((item, i) => (
					<li key={i}>
						<div className="description">{v[i].description}</div>
						{makeJsx(item)}
					</li>
				))}
			</ul>
		</Node>
	)

	return {
		evaluate,
		jsx,
		explanation,
		type: 'numeric',
		category: 'mecanism',
		name: 'le minimum de',
		unit: explanation[0].unit
	}
}

export let mecanismSynchronisation = (recurse, k, v) => {
	let evaluate = (cache, situationGate, parsedRules, node) => {
		let APIExplanation = evaluateNode(
			cache,
			situationGate,
			parsedRules,
			node.explanation.API
		)

		let valuePath = v.chemin.split(' . ')

		let nodeValue =
			APIExplanation.nodeValue == null
				? null
				: path(valuePath, APIExplanation.nodeValue)

		// If the API gave a non null value, then some of its props may be null (the API can be composed of multiple API, some failing). Then this prop will be set to the default value defined in the API's rule
		let safeNodeValue =
			nodeValue == null && APIExplanation.nodeValue != null
				? path(valuePath, APIExplanation.explanation.defaultValue)
				: nodeValue

		let missingVariables =
			APIExplanation.nodeValue === null
				? { [APIExplanation.dottedName]: 1 }
				: {}
		let explanation = { ...v, API: APIExplanation }
		return { ...node, nodeValue: safeNodeValue, explanation, missingVariables }
	}

	return {
		explanation: { ...v, API: recurse(v.API) },
		evaluate,
		jsx: function Synchronisation({ explanation }) {
			return (
				<p>
					Obtenu à partir de la saisie <SimpleRuleLink rule={explanation.API} />
				</p>
			)
		},
		category: 'mecanism',
		name: 'synchronisation'
	}
}

export let mecanismOnePossibility = dottedName => (recurse, k, v) => ({
	...v,
	'une possibilité': 'oui',
	evaluate: (cache, situationGate, parsedRules, node) => ({
		...node,
		missingVariables: { [dottedName]: 1 }
	})
})