import R from 'ramda'
import React from 'react'
import {anyNull, val} from './traverse-common-functions'
import {Node, Leaf} from './traverse-common-jsx'
import {makeJsx, evaluateNode, rewriteNode, evaluateArray, evaluateArrayWithFilter, evaluateObject, parseObject, collectNodeMissing} from './evaluation'
import {findRuleByName} from './rules'

import 'react-virtualized/styles.css'
import {Table, Column} from 'react-virtualized'
import taux_versement_transport from 'Règles/rémunération-travail/cotisations/ok/liste-taux.json'

let constantNode = constant => ({nodeValue: constant, jsx:  nodeValue => <span className="value">{nodeValue}</span>})

let decompose = (recurse, k, v) => {
	let
		subProps = R.dissoc('composantes')(v),
		explanation = v.composantes.map(c =>
			({
				... recurse(
					R.objOf(k,
						{
							... subProps,
							... R.dissoc('attributs')(c)
						})
				),
				composante: c.nom ? {nom: c.nom} : c.attributs
			})
		)

	let jsx = (nodeValue, explanation) =>
		<Node
			classes="mecanism composantes"
			name="composantes"
			value={nodeValue}
			child={
				<ul>
					{ explanation.map((c, i) =>
						[<li className="composante" key={JSON.stringify(c.composante)}>
							<ul className="composanteAttributes">
								{R.toPairs(c.composante).map(([k,v]) =>
									<li>
										<span>{k}: </span>
										<span>{v}</span>
									</li>
								)}
							</ul>
							<div className="content">
								{makeJsx(c)}
							</div>
						</li>,
						i < (explanation.length - 1) && <li className="composantesSymbol"><i className="fa fa-plus-circle" aria-hidden="true"></i></li>
						])
					}
				</ul>
			}
		/>

	let filter = situationGate => c => (!situationGate("sys.filter") || !c.composante || !c.composante['dû par']) || c.composante['dû par'] == situationGate("sys.filter")

	return {
		explanation,
		jsx,
		evaluate: evaluateArrayWithFilter(filter,R.add,0),
		category: 'mecanism',
		name: 'composantes',
		type: 'numeric'
	}
}

let devariate = (recurse, k, v) => {
	let
		subProps = R.dissoc('variations')(v),
		explanation = v.variations.map(c =>
			({
				... recurse(
					R.objOf(k,
						{
							... subProps,
							... R.dissoc('si')(c)
						})
				),
				condition: recurse(c.si)
			})
		)

	let evaluate = (situationGate, parsedRules, node) => {
		let evaluateOne = child => {
				let condition = evaluateNode(situationGate, parsedRules, child.condition)
				return {
					...evaluateNode(situationGate, parsedRules, child),
					condition
				}
			}

		let explanation = R.map(evaluateOne, node.explanation),
			choice = R.find(node => node.condition.nodeValue, explanation),
			nodeValue = choice ? choice.nodeValue : null

		let collectMissing = node => {
			let choice = R.find(node => node.condition.nodeValue, node.explanation),
				leftMissing = choice ? [] : R.chain(collectNodeMissing,R.pluck("condition",node.explanation)),
				rightMissing = choice ? collectNodeMissing(choice) : R.chain(collectNodeMissing,node.explanation)
			return R.concat(leftMissing,rightMissing)
		}

		return rewriteNode(node,nodeValue,explanation,collectMissing)
	}

	// TODO - find an appropriate representation
	let jsx = (nodeValue, explanation) =>
		<Node
			classes="mecanism variations"
			name="variations"
			value={nodeValue}
			child={
				<ul>
					{ explanation.map((c, i) =>
						[<li className="variation" key={JSON.stringify(c.variation)}>
							<div className="condition">
							{makeJsx(c.condition)}
								<div className="content">
									{makeJsx(c)}
								</div>
							</div>
						</li>
						])
					}
				</ul>
			}
		/>

	return {
		explanation,
		evaluate,
		jsx,
		category: 'mecanism',
		name: 'variations',
		type: 'numeric'
	}
}

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

	let explanation = R.map(recurse, v)

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

	let evaluate = (situationGate, parsedRules, node) => {
		let evaluateOne = child => evaluateNode(situationGate, parsedRules, child),
				explanation = R.map(evaluateOne, node.explanation),
			values = R.pluck("nodeValue",explanation),
			nodeValue = R.any(R.equals(true),values) ? true :
							(R.any(R.equals(null),values) ? null : false)

		let collectMissing = node => node.nodeValue == null ? R.chain(collectNodeMissing,node.explanation) : []
		return rewriteNode(node,nodeValue,explanation,collectMissing)
	}

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

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

	let explanation = R.map(recurse, v)

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

	return {
		evaluate: evaluateArray(R.and,true),
		jsx,
		explanation,
		category: 'mecanism',
		name: 'toutes ces conditions',
		type: 'boolean'
	}
}

export let mecanismNumericalSwitch = (recurse, k,v) => {
	// Si "l'aiguillage" est une constante ou une référence directe à une variable;
	// l'utilité de ce cas correspond à un appel récursif au mécanisme
	if (R.is(String,v)) return recurse(v)

	if (!R.is(Object,v) || R.keys(v).length == 0) {
		throw 'Le mécanisme "aiguillage numérique" et ses sous-logiques doivent contenir au moins une proposition'
	}

	// les termes sont les couples (condition, conséquence) de l'aiguillage numérique
	let terms = R.toPairs(v)

	// la conséquence peut être un 'string' ou un autre aiguillage numérique
	let parseCondition = ([condition, consequence]) => {
		let
			conditionNode = recurse(condition), // can be a 'comparison', a 'variable', TODO a 'negation'
			consequenceNode = mecanismNumericalSwitch(recurse, condition, consequence)

		let evaluate = (situationGate, parsedRules, node) => {
			let collectMissing = node => {
				let missingOnTheLeft = collectNodeMissing(node.explanation.condition),
					investigate = node.explanation.condition.nodeValue !== false,
					missingOnTheRight = investigate ? collectNodeMissing(node.explanation.consequence) : []
				return R.concat(missingOnTheLeft, missingOnTheRight)
			}

			let explanation = R.evolve({
				condition: R.curry(evaluateNode)(situationGate, parsedRules),
				consequence: R.curry(evaluateNode)(situationGate, parsedRules)
			}, node.explanation)

			return {
				...node,
				collectMissing,
				explanation,
				nodeValue: explanation.consequence.nodeValue,
				condValue: explanation.condition.nodeValue
			}
		}

		let jsx = (nodeValue, {condition, consequence}) =>
			<div className="condition">
					{makeJsx(condition)}
					<div>
						{makeJsx(consequence)}
					</div>
				</div>

		return {
				evaluate,
				jsx,
				explanation: {condition: conditionNode, consequence: consequenceNode},
				category: 'condition',
				text: condition,
				condition: conditionNode,
				type: 'boolean',
			}
	}

	let evaluateTerms = (situationGate, parsedRules, node) => {
		let
			evaluateOne = child => evaluateNode(situationGate, parsedRules, child),
			explanation = R.map(evaluateOne, node.explanation),
			choice = R.find(node => node.condValue, explanation),
			nonFalsyTerms = R.filter(node => node.condValue !== false, explanation),
			getFirst = (prop) => R.pipe(R.head, R.prop(prop))(nonFalsyTerms),
			nodeValue =
				// voilà le "numérique" dans le nom de ce mécanisme : il renvoie zéro si aucune condition n'est vérifiée
				R.isEmpty(nonFalsyTerms) ? 0 :
					// c'est un 'null', on renvoie null car des variables sont manquantes
					getFirst('condValue') == null ? null :
						// c'est un true, on renvoie la valeur de la conséquence
						getFirst('nodeValue')

		let collectMissing = node => {
			let choice = R.find(node => node.condValue, node.explanation)
			return choice ? collectNodeMissing(choice) : R.chain(collectNodeMissing,node.explanation)
		}

		return rewriteNode(node,nodeValue,explanation,collectMissing)
	}

	let explanation = R.map(parseCondition,terms)

	let jsx = (nodeValue, explanation) =>
		<Node
			classes="mecanism numericalSwitch list"
			name="aiguillage numérique"
			value={nodeValue}
			child={
				<ul>
					{explanation.map(item => <li key={item.name || item.text}>{makeJsx(item)}</li>)}
				</ul>
			}
		/>

	return {
		evaluate: evaluateTerms,
		jsx,
		explanation,
		category: 'mecanism',
		name: "aiguillage numérique",
		type: 'boolean || numeric' // lol !
	}
}

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

	let evaluate = evaluateArray(R.add,0)

	let jsx = (nodeValue, explanation) =>
		<Node
			classes="mecanism somme"
			name="somme"
			value={nodeValue}
			child={
				<ul>
					{explanation.map(v => <li key={v.name || v.text}>{makeJsx(v)}</li>)}
				</ul>
			}
		/>

	return {
		evaluate,
		jsx,
		explanation,
		category: 'mecanism',
		name: 'somme',
		type: 'numeric'
	}
}

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

	let objectShape = {
		assiette:false,
		taux:constantNode(1),
		facteur:constantNode(1),
		plafond:constantNode(Infinity)
	}
	let effect = ({assiette,taux,facteur,plafond}) => {
		let mult = (base, rate, facteur, plafond) => Math.min(base, plafond) * rate * facteur
		return (val(taux) === 0 || val(taux) === false || val(assiette) === 0 || val(facteur) === 0) ?
			0
		: anyNull([taux, assiette, facteur, plafond]) ?
				null
			: mult(val(assiette), val(taux), val(facteur), val(plafond))
	}

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

	let jsx = (nodeValue, explanation) =>
		<Node
			classes="mecanism multiplication"
			name="multiplication"
			value={nodeValue}
			child={
				<ul className="properties">
					<li key="assiette">
						<span className="key">assiette: </span>
						<span className="value">{makeJsx(explanation.assiette)}</span>
					</li>
					{(explanation.taux.nodeValue != 1 || explanation.taux.category == 'calcExpression') &&
					<li key="taux">
						<span className="key">taux: </span>
						<span className="value">{makeJsx(explanation.taux)}</span>
					</li>}
					{(explanation.facteur.nodeValue != 1 || explanation.taux.category == 'calcExpression') &&
					<li key="facteur">
						<span className="key">facteur: </span>
						<span className="value">{makeJsx(explanation.facteur)}</span>
					</li>}
					{explanation.plafond.nodeValue != Infinity &&
					<li key="plafond">
						<span className="key">plafond: </span>
						<span className="value">{makeJsx(explanation.plafond)}</span>
					</li>}
				</ul>
			}
		/>

	return {
		evaluate,
		jsx,
		explanation,
		category: 'mecanism',
		name: 'multiplication',
		type: 'numeric'
	}
}

export let mecanismScale = (recurse,k,v) => {
	// Sous entendu : barème en taux marginaux.
	// A étendre (avec une propriété type ?) quand les règles en contiendront d'autres.
	if (v.composantes) { //mécanisme de composantes. Voir known-mecanisms.md/composantes
		return decompose(recurse,k,v)
	}
	if (v.variations) {
		return devariate(recurse,k,v)
	}

	/* on réécrit en plus bas niveau les tranches :
	`en-dessous de: 1`
	devient
	```
	de: 0
	à: 1
	```
	*/
	let tranches = v['tranches'].map(t =>
			R.has('en-dessous de')(t) ? {de: 0, 'à': t['en-dessous de'], taux: t.taux}
			: R.has('au-dessus de')(t) ? {de: t['au-dessus de'], 'à': Infinity, taux: t.taux}
				: t)


	let objectShape = {
		assiette:false,
		'multiplicateur des tranches':constantNode(1)
	}

	let effect = ({assiette, 'multiplicateur des tranches': multiplicateur, tranches}) => {
		// TODO traiter la récursion 'de', 'à', 'taux' pour qu'ils puissent contenir des calculs
		// ou pour les cas où toutes les tranches n'ont pas un multiplicateur commun (ex. plafond
		// sécurité sociale). Il faudra alors vérifier leur nullité comme ça :
		/*
			nulled = assiette.nodeValue == null || R.any(
				R.pipe(
					R.values, R.map(val), R.any(R.equals(null))
				)
			)(tranches),
		*/
		// nulled = anyNull([assiette, multiplicateur]),
		let nulled = val(assiette) == null || val(multiplicateur) == null

		return nulled ?
				null
			: tranches.reduce((memo, {de: min, 'à': max, taux}) =>
				( val(assiette) < ( min * val(multiplicateur) ) )
					? memo + 0
					:	memo
						+ ( Math.min(val(assiette), max * val(multiplicateur)) - (min * val(multiplicateur)) )
						* recurse(taux).nodeValue
			, 0)
		}

	let explanation = {
				...parseObject(recurse,objectShape,v),
				tranches
			},
		evaluate = evaluateObject(objectShape,effect)

	let jsx = (nodeValue, explanation) =>
		<Node
			classes="mecanism barème"
			name="barème"
			value={nodeValue}
			child={
				<ul className="properties">
					<li key="assiette">
						<span className="key">assiette: </span>
						<span className="value">{makeJsx(explanation.assiette)}</span>
					</li>
					<li key="multiplicateur">
						<span className="key">multiplicateur des tranches: </span>
						<span className="value">{makeJsx(explanation['multiplicateur des tranches'])}</span>
					</li>
					<table className="tranches">
						<thead>
							<tr>
								<th>Tranches de l'assiette</th>
								<th>Taux</th>
							</tr>
							{explanation.tranches.map(({'en-dessous de': maxOnly, 'au-dessus de': minOnly, de: min, 'à': max, taux}) =>
								<tr key={min || minOnly || 0}
									style={{fontWeight: (explanation.assiette.nodeValue * explanation['multiplicateur des tranches'].nodeValue > min ? ' bold' : '')}}
								>
									<td>
										{	maxOnly ? 'En dessous de ' + maxOnly
											: minOnly ? 'Au dessus de ' + minOnly
												: `De ${min} à ${max}` }
									</td>
									<td> {taux} </td>
								</tr>
							)}
						</thead>
					</table>
				</ul>
			}
		/>

	return {
		evaluate,
		jsx,
		explanation,
		category: 'mecanism',
		name: 'barème',
		barème: 'en taux marginaux',
		type: 'numeric'
	}
}

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

	let evaluate = evaluateArray(R.max,Number.NEGATIVE_INFINITY)

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

	return {
		evaluate,
		jsx,
		explanation,
		type: 'numeric',
		category: 'mecanism',
		name: 'le maximum de'
	}
}

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

	let evaluate = evaluateArray(R.min,Infinity)

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

	return {
		evaluate,
		jsx,
		explanation,
		type: 'numeric',
		category: 'mecanism',
		name: 'le minimum de'
	}
}

export let mecanismComplement = (recurse,k,v) => {
	if (v.composantes) { //mécanisme de composantes. Voir known-mecanisms.md/composantes
		return decompose(recurse,k,v)
	}

	let objectShape = {cible:false,montant:false}
	let effect = ({cible,montant}) => {
		let nulled = val(cible) == null
		return nulled ? null : R.subtract(val(montant), R.min(val(cible), val(montant)))
	}
	let explanation = parseObject(recurse,objectShape,v)

	return {
		evaluate: evaluateObject(objectShape,effect),
		explanation,
		type: 'numeric',
		category: 'mecanism',
		name: 'complément pour atteindre',
		jsx: <Node
			classes="mecanism list complement"
			name="complément pour atteindre"
			child={
				<ul className="properties">
					<li key="cible">
						<span className="key">montant calculé: </span>
						<span className="value">{makeJsx(explanation.cible)}</span>
					</li>
					<li key="mini">
						<span className="key">montant à atteindre: </span>
						<span className="value">{makeJsx(explanation.montant)}</span>
					</li>
				</ul>
			}
		/>
	}
}

export let mecanismSelection = (recurse,k,v) => {
	if (v.composantes) { //mécanisme de composantes. Voir known-mecanisms.md/composantes
		return decompose(recurse,k,v)
	}

	let dataSourceName = v['données']
	let dataSearchField = v['dans']
	let dataTargetName = v['renvoie']
	let explanation = recurse(v['cherche'])

	let evaluate = (situationGate, parsedRules, node) => {
		let collectMissing = node => collectNodeMissing(node.explanation),
			explanation = evaluateNode(situationGate, parsedRules, node.explanation),
			dataSource = findRuleByName(parsedRules, dataSourceName),
			data = dataSource ? dataSource['data'] : null,
			dataKey = explanation.nodeValue,
			dataItems = (data && dataKey && dataSearchField) ? R.filter(item => item[dataSearchField] == dataKey, data) : null,
			dataItemValues = (dataItems && !R.isEmpty(dataItems)) ? R.values(dataItems) : null,
			// TODO - over-specific! transform the JSON instead
			dataItemSubValues = dataItemValues && dataItemValues[0][dataTargetName] ? dataItemValues[0][dataTargetName]["taux"] : null,
			sortedSubValues = dataItemSubValues ? R.sortBy(pair => pair[0], R.toPairs(dataItemSubValues)) : null,
			// return 0 if we found a match for the lookup but not for the specific field,
			// so that component sums don't sum to null
			nodeValue = dataItems ? (sortedSubValues ? Number.parseFloat(R.last(sortedSubValues)[1])/100 : 0) : null
		return rewriteNode(node,nodeValue,explanation,collectMissing)
	}

	let indexOf = explanation => explanation.nodeValue ? R.findIndex(x => x['nomLaposte'] == explanation.nodeValue, taux_versement_transport) : 0
	let indexOffset = 8

	let jsx = (nodeValue, explanation) =>
		<Node
			classes="mecanism"
			name="sélection"
			value={nodeValue}
			child={
				<Table
					width={300}
					height={300}
					headerHeight={20}
					rowHeight={30}
					rowCount={taux_versement_transport.length}
					scrollToIndex={indexOf(explanation)+indexOffset}
					rowStyle={
						({ index }) => index == indexOf(explanation) ? { fontWeight: "bold" } : {}
					}
					rowGetter={
						({ index }) => {
							// transformation de données un peu crade du fichier taux.json qui gagnerait à être un CSV
							let line = taux_versement_transport[index],
								getLastTaux = dataTargetName => {
									let lastTaux = R.values(R.path([dataTargetName, 'taux'], line))
									return (lastTaux && lastTaux.length && lastTaux[0]) || 0
								}
							return {
								nom: line['nomLaposte'],
								taux: getLastTaux(dataTargetName)
							}
						}
					}
				>
					<Column
						label='Nom de commune'
						dataKey='nom'
						width={200}
					/>
					<Column
						width={100}
						label={'Taux ' + dataTargetName}
						dataKey="taux"
					/>
				</Table>
			}
		/>

	return {
		evaluate,
		explanation,
		jsx
	}
}

export let mecanismError = (recurse,k,v) => {
	throw "Le mécanisme '"+k+"' est inconnu !"+v
}