import R from 'ramda'

export let makeJsx = node =>
	typeof node.jsx == 'function'
		? node.jsx(node.nodeValue, node.explanation)
		: node.jsx

export let collectNodeMissing = node =>
	node.collectMissing ? node.collectMissing(node) : []

export let evaluateNode = (cache, situationGate, parsedRules, node) =>
	node.evaluate ? node.evaluate(cache, situationGate, parsedRules, node) : node

export let rewriteNode = (node, nodeValue, explanation, collectMissing) => ({
	...node,
	nodeValue,
	collectMissing,
	explanation
})

export let evaluateArray = (reducer, start) => (
	cache,
	situationGate,
	parsedRules,
	node
) => {
	let evaluateOne = child =>
			evaluateNode(cache, situationGate, parsedRules, child),
		explanation = R.map(evaluateOne, node.explanation),
		values = R.pluck('nodeValue', explanation),
		nodeValue = R.any(R.equals(null), values)
			? null
			: R.reduce(reducer, start, values)

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

export let evaluateArrayWithFilter = (filter, reducer, start) => (
	cache,
	situationGate,
	parsedRules,
	node
) => {
	let evaluateOne = child =>
			evaluateNode(cache, situationGate, parsedRules, child),
		explanation = R.map(
			evaluateOne,
			R.filter(filter(situationGate), node.explanation)
		),
		values = R.pluck('nodeValue', explanation),
		nodeValue = R.any(R.equals(null), values)
			? null
			: R.reduce(reducer, start, values)

	let collectMissing = node => R.chain(collectNodeMissing, node.explanation)
	return rewriteNode(node, nodeValue, explanation, collectMissing)
}

export let parseObject = (recurse, objectShape, value) => {
	let recurseOne = key => defaultValue => {
		if (!value[key] && !defaultValue) throw "Il manque une valeur '" + key + "'"
		return value[key] ? recurse(value[key]) : defaultValue
	}
	let transforms = R.fromPairs(
		R.map(k => [k, recurseOne(k)], R.keys(objectShape))
	)
	return R.evolve(transforms, objectShape)
}

export let evaluateObject = (objectShape, effect) => (
	cache,
	situationGate,
	parsedRules,
	node
) => {
	let evaluateOne = child =>
			evaluateNode(cache, situationGate, parsedRules, child),
		collectMissing = node =>
			R.chain(collectNodeMissing, R.values(node.explanation))

	let transforms = R.map(k => [k, evaluateOne], R.keys(objectShape)),
		explanation = R.evolve(R.fromPairs(transforms))(node.explanation),
		nodeValue = effect(explanation)
	return rewriteNode(node, nodeValue, explanation, collectMissing)
}