import {Module} from "@/interfaces";

type Type = "academic" | "general";

const readingGeneralMarking: {[key: number]: number} = {
	100: 9,
	97.5: 8.5,
	92.5: 8,
	90: 7.5,
	85: 7,
	80: 6.5,
	75: 6,
	67.5: 5.5,
	57.5: 5,
	45.5: 4.5,
	37.5: 4,
	30: 3.5,
	22.5: 3,
	15: 2.5,
};

const academicMarking: {[key: number]: number} = {
	97.5: 9,
	92.5: 8.5,
	87.5: 8,
	80: 7.5,
	75: 7,
	65: 6.5,
	57.5: 6,
	45: 5.5,
	40: 5,
	32.5: 4.5,
	25: 4,
	20: 3.5,
	15: 3,
	10: 2.5,
};

const moduleMarkings: {[key in Module]: {[key in Type]: {[key: number]: number}}} = {
	reading: {
		academic: academicMarking,
		general: readingGeneralMarking,
	},
	listening: {
		academic: academicMarking,
		general: academicMarking,
	},
	writing: {
		academic: academicMarking,
		general: readingGeneralMarking,
	},
	speaking: {
		academic: academicMarking,
		general: academicMarking,
	},
};

export const calculateBandScore = (correct: number, total: number, module: Module, type: Type) => {
	const marking = moduleMarkings[module][type];
	const percentage = (correct * 100) / total;

	for (const value of Object.keys(marking)
		.map((x) => parseFloat(x))
		.sort((a, b) => b - a)) {
		if (percentage >= value) {
			return marking[value];
		}
	}

	return 0;
};

export const calculateAverageLevel = (levels: {[key in Module]: number}) => {
	return Object.keys(levels).reduce((accumulator, current) => levels[current as Module] + accumulator, 0) / 4;
};