class Dice {
    constructor(sides, addition = 0, count = 1, color = "#000") {
        this.sides = sides;
        this.addition = addition;
        this.count = count;
        this.color = color;
        this.selected = false;
    }
}

class DiceHistoryEntry {
    constructor(dice = undefined, formula = undefined, result = undefined) {
        this.dice = dice;
        this.formula = formula;
        this.result = result;
    }
}

const default_sides = [4, 6, 8, 10, 12, 20, 100];
const default_colors = ["#de324c", "#f4895f", "#f8e16f", "#95cf92", "#369acc", "#9656a2", "#000000"];

let darkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;

let dices = [];
let history = [];

let dicesContainer = document.getElementById("dices");
let historyContainer = document.getElementById("history");

function getDiceLabel(dice) {
    return (dice.count > 1 ? dice.count : "") + "D" + dice.sides + (dice.addition ? (dice.addition < 0 ? "-" : "+") + Math.abs(dice.addition) : "");
}

function renderDice(dice, index) {
    const diceElement = document.createElement("div");
    diceElement.classList.add("dice");

    const diceImage = document.createElement("div");
    diceImage.classList.add("dice-image");
    if (default_sides.indexOf(dice.sides) != -1) {
        diceImage.classList.add("dice-image-" + dice.sides);
    } else {
        diceImage.classList.add("dice-image-custom");
    }
    if (dice.color) {
        diceImage.style.backgroundColor = dice.color;
        // revert b/w on dark-mode
        if (darkMode) {
            if (["#000", "#000000", "black", "rgb(0,0,0)", "rgb(0, 0, 0)"].indexOf(dice.color) != -1) {
                diceImage.style.backgroundColor = "#fff";
            } else if (["#fff", "#ffffff", "white", "rgb(255,255,255)", "rgb(255, 255, 255)"].indexOf(dice.color) != -1) {
                diceImage.style.backgroundColor = "#000";
            }
        }
    }

    const diceImageContainer = document.createElement("div");
    diceImageContainer.classList.add("dice-image-container");
    diceImageContainer.onclick = function () {
        if (dices[index].selected) {
            dices[index].selected = false;
            diceElement.classList.remove("selected");
        } else {
            dices[index].selected = true;
            diceElement.classList.add("selected");
        }

        if (dices.filter((dice) => dice.selected).length) {
            document.getElementById('roll-button').classList.remove("disabled");
        } else {
            document.getElementById('roll-button').classList.add("disabled");
        }

        localStorage.setItem('dices', JSON.stringify(dices));
    };
    diceImageContainer.appendChild(diceImage);

    diceElement.appendChild(diceImageContainer);

    const diceLabelContainer = document.createElement("div");
    diceLabelContainer.classList.add("label-container");

    const diceLabel = document.createElement("label");
    diceLabel.innerText = getDiceLabel(dice);

    diceLabelContainer.appendChild(diceLabel);
    diceElement.appendChild(diceLabelContainer);

    const diceRemove = document.createElement("div");
    diceRemove.classList.add("remove");
    diceRemove.onclick = function () {
        removeDice(index);
    };
    diceElement.appendChild(diceRemove);

    if (dice.selected) {
        diceElement.classList.add("selected");
    } else {
        diceElement.classList.remove("selected");
    }


    dicesContainer.appendChild(diceElement);
}

function renderDices() {
    dicesContainer.innerHTML = "";
    dices.forEach((dice, index) => {
        renderDice(dice, index);
    })

    if (dices.filter((dice) => dice.selected).length) {
        document.getElementById('roll-button').classList.remove("disabled");
    } else {
        document.getElementById('roll-button').classList.add("disabled");
    }
}

function addDice(sides, addition = 0, count = 1, color = "#000") {
    dices.push(new Dice(sides, addition, count, color));
    localStorage.setItem('dices', JSON.stringify(dices));
    renderDices();
}

function removeDice(index) {
    dices.splice(index, 1);
    localStorage.setItem('dices', JSON.stringify(dices));
    renderDices();
}

function resetDices() {
    dices = [];
    default_sides.forEach((side, i) => {
        dices.push(new Dice(side, 0, 1, default_colors[i]));
    });
    localStorage.setItem('dices', JSON.stringify(dices));
    renderDices();
}


function addDiceForm() {
    let inputSides = document.getElementById("inputSides");
    if (!inputSides.value) {
        inputSides = document.getElementById("inputCustom")
    }
    const inputAddition = document.getElementById("inputAddition");
    const inputCount = document.getElementById("inputCount");
    const inputColor = document.getElementById("inputColor");
    addDice(+inputSides.value, +inputAddition.value, +inputCount.value, inputColor.value);
}

function setDicesContainer(container) {
    dicesContainer = container;
}

function renderHistory() {
    historyContainer.innerHTML = "";
    if (history.length) {
        document.getElementById('history-button').classList.remove("disabled");
    } else {
        document.getElementById('history-button').classList.add("disabled");
    }
    history.forEach((entry) => {
        if (entry.dice && entry.result) {
            const entryElement = document.createElement("div");
            entryElement.classList.add("entry");
            const diceLabel = document.createElement("label");
            diceLabel.innerHTML = getDiceLabel(entry.dice) + ":&nbsp;";
            diceLabel.style.color = entry.dice.color;
            // revert b/w on dark-mode
            if (darkMode) {
                if (["#000", "#000000", "black", "rgb(0,0,0)", "rgb(0, 0, 0)"].indexOf(entry.dice.color) != -1) {
                    diceLabel.style.color = "#fff";
                } else if (["#fff", "#ffffff", "white", "rgb(255,255,255)", "rgb(255, 255, 255)"].indexOf(entry.dice.color) != -1) {
                    diceLabel.style.color = "#000";
                }
            }
            entryElement.appendChild(diceLabel);

            const diceResult = document.createElement("span");
            diceResult.innerText = entry.result;
            entryElement.appendChild(diceResult);

            const diceFormula = document.createElement("span");
            const diceEqual = document.createElement("span");
            entryElement.appendChild(diceEqual);
            entryElement.appendChild(diceFormula);

            if (entry.formula) {
                diceFormula.innerText = entry.formula;
                diceEqual.innerText = " = "
            }

            historyContainer.appendChild(entryElement);
        } else {
            historyContainer.appendChild(document.createElement("hr"));
        }
    })
}

function roll(dice) {
    let formula = "";
    for (let index = 0; index < dice.count; index++) {
        formula += Math.floor(Math.random() * dice.sides + 1);
        if (index < dice.count - 1) {
            formula += " + ";
        }
    }
    if (dice.addition) {
        formula += " + " + dice.addition;
    }
    const result = eval(formula);
    if (formula.indexOf("+") == -1) {
        formula = "";
    }
    history.unshift(new DiceHistoryEntry(dice, formula, result));
    localStorage.setItem('history', JSON.stringify(history));
    renderHistory();
}

function rollSelected() {
    if (dices.filter((dice) => dice.selected).length) {
        if (history.length) {
            history.unshift(new DiceHistoryEntry());
        }
        dices.forEach((dice) => {
            if (dice.selected) {
                roll(dice);
            }
        })
    }
}

function clearHistory() {
    history = [];
    localStorage.removeItem('history');
    renderHistory();
}

function exportData() {
    const downloadButton = document.createElement('a');
    downloadButton.setAttribute('href', 'data:application/json;charset=utf-8,' + encodeURIComponent(JSON.stringify({ dices: dices, history: history })));
    downloadButton.setAttribute('download', 'rgp-dices-' + new Date().toISOString() + '.json');
    document.body.appendChild(downloadButton);
    downloadButton.click();
    document.body.removeChild(downloadButton);
}

function importData(event) {
    event.target.parentElement.classList.remove("error");
    try {
        const reader = new FileReader();
        reader.addEventListener('load', async (event) => {
            const data = JSON.parse(event.target.result);
            if (data.dices) {
                dices = data.dices;
                renderDices();
            }
            if (data.history) {
                history = data.history;
                renderHistory();
            }
        });

        reader.readAsText(event.target.files[0]);
    } catch (e) {
        console.warn(e);
        event.target.parentElement.classList.add("error");
    }
}

function updateCustom() {
    if (!document.getElementById("inputSides").value) {
        document.getElementById("inputCustom").classList.remove("hidden");
    } else {
        document.getElementById("inputCustom").classList.add("hidden");
    }
}

function toggleDarkMode() {
    if (darkMode) {
        darkMode = false;
        document.body.classList.remove("dark");
        document.getElementById("dark-mode-icon").src = "./assets/dark.svg";
        document.getElementById("dark-mode-text").innerText = "Dark Mode";
    } else {
        darkMode = true;
        document.body.classList.add("dark");
        document.getElementById("dark-mode-icon").src = "./assets/light.svg";
        document.getElementById("dark-mode-text").innerText = "Light Mode";
    }
    renderDices();
    renderHistory();
}

if (localStorage.getItem('dices')) {
    dices = JSON.parse(localStorage.getItem('dices'));
} else {
    default_sides.forEach((side, i) => {
        dices.push(new Dice(side, 0, 1, default_colors[i]));
    })
}

if (localStorage.getItem('history')) {
    history = JSON.parse(localStorage.getItem('history'));
}

document.getElementById("importFile").addEventListener("change", importData);

renderDices();
renderHistory();
updateCustom();

if (darkMode) {
    document.body.classList.add("dark");
    document.getElementById("dark-mode-icon").src = "./assets/light.svg";
    document.getElementById("dark-mode-text").innerText = "Light Mode";
}