import i18next from "i18next";
import LanguageDetector from "i18next-browser-languagedetector";
import HttpApi from "i18next-http-backend";

/////////////////
// TRANSLATION //
/////////////////

async function initI18next() {
    await i18next
        .use(HttpApi)
        .use(LanguageDetector)
        .init({
            supportedLngs: ["en", "de"],
            nonExplicitSupportedLngs: true,
            fallbackLng: "en",
            debug: true,
            backend: {
                loadPath: "/lang/{{lng}}.json",
            },
        });
}

function translatePageElements() {
    // Translate content inside a tag
    const translatableElements = document.querySelectorAll(
        "[data-i18n-key]",
    );
    translatableElements.forEach((el) => {
        const key = el.getAttribute("data-i18n-key");
        el.innerHTML = i18next.t(key);
    });
    // Translate alt texts
    const translatableAltTexts = document.querySelectorAll(
        "[alt-i18n-key]",
    );
    translatableAltTexts.forEach((el) => {
        const translation_key = el.getAttribute("alt-i18n-key");
        el.setAttribute("alt", i18next.t(translation_key));
    });

}

function bindLocaleSwitcher(initialValue) {
    const switcher = document.querySelector(
        "[data-i18n-switcher]",
    );
    switcher.value = initialValue;
    switcher.onchange = (e) => {
        i18next
            .changeLanguage(e.target.value)
            .then(translatePageElements)
            .then(update);
    };
}

(async function () {
    await initI18next();
    translatePageElements();
    bindLocaleSwitcher(i18next.resolvedLanguage);
    update();
})();

////////////////
// CALCULATOR //
////////////////

const MINIMUM_BASE_AREA = 0.5;
const MINIMUM_AREA_THREE_RATS = 1.5;
const AREA_PER_ADDITIONAL_RAT = 0.25;
const MAXIMUM_FALL_HEIGHT = 0.5;
const MINIMUM_LENGTH_LONG_SIDE = 0.8;
const MINIMUM_LENGTH_SHORT_SIDE = 0.5;
const MINIMUM_FLOOR_HEIGHT = 0.25;

const FAILED_BASE_AREA = "base_area";
const FAILED_OVERALL_AREA = "overall_area";
const FAILED_FALL_HEIGHT = "fall_height";
const FAILED_NUM_RATS = "num_rats";
const FAILED_MINIMUM_LENGTH_LONG_SIDE = "length_long_side";
const FAILED_MINIMUM_LENGTH_SHORT_SIDE= "length_short_side";
const FAILED_FLOOR_HEIGHT = "floor_height"


class Validator {
    constructor() {
        this.FAIL_CRITERIA = {
            [FAILED_BASE_AREA]: i18next.t('failed-base-area', {"MINIMUM_BASE_AREA": MINIMUM_BASE_AREA}),
            [FAILED_OVERALL_AREA]: i18next.t("failed-overall-area"),
            [FAILED_FALL_HEIGHT]: i18next.t("failed-fall-height", {"maximum_fall_height": (MAXIMUM_FALL_HEIGHT * 100).toFixed(0)}),
            [FAILED_FLOOR_HEIGHT]: i18next.t("failed-floor-height", {"minimum_floor_height": (MINIMUM_FLOOR_HEIGHT * 100).toFixed(0)}),
            [FAILED_NUM_RATS]: i18next.t("failed-num-rats"),
            [FAILED_MINIMUM_LENGTH_LONG_SIDE]: i18next.t("failed-minimum-length-long-side", {"minimum_length_long_side": (MINIMUM_LENGTH_LONG_SIDE * 100).toFixed(0)}),
            [FAILED_MINIMUM_LENGTH_SHORT_SIDE]: i18next.t("failed-minimum-length-short-side", {"minimum_length_short_side": (MINIMUM_LENGTH_SHORT_SIDE * 100).toFixed(0)}),
        };
    }

    overallAreaNeeded(numOfRats) {
        if (numOfRats < 3 || numOfRats > 15) {
            throw new Error("This formula works only from 3 to 15 rats");
        }
        return MINIMUM_AREA_THREE_RATS + (numOfRats - 3) * AREA_PER_ADDITIONAL_RAT;
    }

    cageCheck(dimensions, numRats, numFullFloors) {
        let failedCriteria = {};

        if (numRats < 2 || numRats > 15) {
            failedCriteria[FAILED_NUM_RATS] = this.FAIL_CRITERIA[FAILED_NUM_RATS];
        }

        const baseArea = dimensions.depth * dimensions.width;
        if (baseArea < MINIMUM_BASE_AREA) {
            failedCriteria[FAILED_BASE_AREA] = this.FAIL_CRITERIA[FAILED_BASE_AREA];
        }

        const areaNeeded = this.overallAreaNeeded(numRats);
        if (baseArea * numFullFloors < areaNeeded) {
            failedCriteria[FAILED_OVERALL_AREA] = this.FAIL_CRITERIA[FAILED_OVERALL_AREA];
        }

        if (dimensions.height / numFullFloors > MAXIMUM_FALL_HEIGHT) {
            failedCriteria[FAILED_FALL_HEIGHT] = this.FAIL_CRITERIA[FAILED_FALL_HEIGHT];
        }

        if (dimensions.width < MINIMUM_LENGTH_LONG_SIDE && dimensions.depth < MINIMUM_LENGTH_LONG_SIDE) {
            failedCriteria[FAILED_MINIMUM_LENGTH_LONG_SIDE] = this.FAIL_CRITERIA[FAILED_MINIMUM_LENGTH_LONG_SIDE];
        }

        if (dimensions.width < MINIMUM_LENGTH_SHORT_SIDE || dimensions.depth < MINIMUM_LENGTH_SHORT_SIDE) {
            failedCriteria[FAILED_MINIMUM_LENGTH_SHORT_SIDE] = this.FAIL_CRITERIA[FAILED_MINIMUM_LENGTH_SHORT_SIDE];
        }

        if (dimensions.height / numFullFloors < MINIMUM_FLOOR_HEIGHT) {
            failedCriteria[FAILED_FLOOR_HEIGHT] = this.FAIL_CRITERIA[FAILED_FLOOR_HEIGHT];
        }

        return failedCriteria;
    }



}

class Dimensions {
    constructor(width, depth, height) {
        this.width = width;
        this.depth = depth;
        this.height = height;
    }

    toString() {
        return `${this.width}x${this.depth}x${this.height}`;
    }

    static fromDict(data) {
        const { width, depth,  height } = data;
        return new Dimensions(width, depth, height);
    }
}


//////////////////////////
// DOCUMENT INTERACTION //
//////////////////////////

const inputDecreaseFloorNum = document.getElementById("decreaseFloorNum");
inputDecreaseFloorNum.onclick = decreaseFloorNum;

const inputIncreaseFloorNum = document.getElementById("increaseFloorNum");
inputIncreaseFloorNum.onclick = increaseFloorNum;


const inputWidth = document.getElementById("width");
inputWidth.onchange = updateViaManualMeasurements;
const inputDepth = document.getElementById("depth");
inputDepth.onchange = updateViaManualMeasurements;
const inputHeight = document.getElementById("height");
inputHeight.onchange = updateViaManualMeasurements;


const selectSavicSuiteRoyaleXL = document.getElementById("SavicSuiteRoyaleXL");
const selectSavicSuiteRoyale95Double = document.getElementById("SavicSuiteRoyale95Double");
const selectTiakiKleintierkäfigEtagere = document.getElementById("TiakiKleintierkäfigEtagere");

const cardSavicSuiteRoyaleXL = document.getElementById("card-SavicSuiteRoyaleXL");
const cardSavicSuiteRoyale95Double = document.getElementById("card-SavicSuiteRoyale95Double");
const cardTiakiKleintierkäfigEtagere = document.getElementById("card-TiakiKleintierkäfigEtagere");


function markActiveCage(cageName) {

    cardSavicSuiteRoyaleXL.classList.remove("card-active");
    cardSavicSuiteRoyale95Double.classList.remove("card-active");
    cardTiakiKleintierkäfigEtagere.classList.remove("card-active");
    if (cageName != "") {
        const activeCage = document.getElementById("card-" + cageName);
        activeCage.classList.add("card-active")
    }

}

function updateCage(event) {
    selectSavicSuiteRoyaleXL.checked = false;
    selectSavicSuiteRoyale95Double.checked = false;
    selectTiakiKleintierkäfigEtagere.checked = false;
    const selectedCage = event.currentTarget
    selectedCage.checked = true;
    const cageName = selectedCage.id;

    var dim = getCageDimensions(cageName);
    inputWidth.value = dim.width;
    inputDepth.value = dim.depth;
    inputHeight.value = dim.height;

    markActiveCage(cageName);

    update();
}

selectSavicSuiteRoyaleXL.onchange = updateCage;
selectSavicSuiteRoyale95Double.onchange = updateCage;
selectTiakiKleintierkäfigEtagere.onchange = updateCage;


var labelNumRats = document.getElementById("labelNumRats");

var ratSlider = document.getElementById("numRats");

ratSlider.oninput = function () {
    update();
}

// Full floor functions
var fullFloorNum = document.getElementById("numFullFloors");

function getCageDimensions(cageName) {
    if (cageName == "SavicSuiteRoyaleXL") {
        return new Dimensions(115, 67.5, 153);
    }
    if (cageName == "SavicSuiteRoyale95Double") {
        return new Dimensions(95, 63, 120);
    }
    if (cageName == "TiakiKleintierkäfigEtagere") {
        return new Dimensions(93.5, 63, 141.2);
    }
}

function getResultFromChecks(checks) {
    if (Object.keys(checks).length > 0) {
        const ul = document.createElement('ul');
        for (const key in checks) {
            const li = document.createElement('li');
            li.textContent = `❌ ` + checks[key];
            ul.appendChild(li);
        }
        return ul;
    } else {
        const p = document.createElement('p');
        p.innerHTML = "✅ " + i18next.t("cage-complies-with-all-criteria")
        return p;
    }

}

function updateViaManualMeasurements() {
    markActiveCage("ManualMeasurements");
    update();
}

function update() {
    labelNumRats.innerHTML = i18next.t("cage-for-x-rats", {"num_rats": ratSlider.value});

    const width = inputWidth.value
    const depth = inputDepth.value
    const height = inputHeight.value
    const dimensions = new Dimensions(width / 100, depth / 100, height / 100);
    const validator = new Validator();
    const failed_checks = validator.cageCheck(dimensions, ratSlider.value, fullFloorNum.value);
    let resultsDiv = document.getElementById("resultsDiv");

    const result = getResultFromChecks(failed_checks);

    resultsDiv.innerHTML = "";
    resultsDiv.appendChild(result);
}


function decreaseFloorNum() {
    var input = document.getElementById('numFullFloors');
    var value = parseInt(input.value);
    if (value > 0) {
        input.value = value - 1;
    }
    update();
}

function increaseFloorNum() {
    var input = document.getElementById('numFullFloors');
    var value = parseInt(input.value);
    input.value = value + 1;
    update();
}