const input = document.getElementById('textInput');
const btn = document.getElementById('applyBtn');
const resetBtn = document.getElementById('resetBtn');
const container = document.getElementById('container');
const selectionBox = document.getElementById('selectionBox');

let letters = [];
let isDragging = false;
let isSelecting = false;
let hasMoved = false;
let startX = 0;
let startY = 0;
let dragOffsets = [];
let clickedLetter = null;

function init() {
    if (window.localStorage) {
        const saved = localStorage.getItem('savedWord');

        if (saved) {
            input.value = saved;
            createLetters(saved);
        }
    }
}

function createLetters(text) {
    container.innerHTML = '';
    letters = [];

    let totalWidth = 0;
    const tempElements = [];

    for (let i = 0; i < text.length; i++) {
        const el = document.createElement('span');
        el.textContent = text[i];
        el.className = 'letter';
        container.appendChild(el);
        const rect = el.getBoundingClientRect();
        totalWidth += rect.width + 2;
        tempElements.push({ el, rect });
    }

    let startLeft = (window.innerWidth - totalWidth) / 2;
    let top = window.innerHeight / 2;

    for (let i = 0; i < text.length; i++) {
        const item = tempElements[i];
        let x = startLeft;
        let y = top;
        item.el.style.left = x + 'px';
        item.el.style.top = y + 'px';

        letters.push({
            char: text[i],
            el: item.el,
            x: x,
            y: y,
            initialX: x,
            initialY: y,
            selected: false,
            width: item.rect.width,
            height: item.rect.height
        });

        startLeft += item.rect.width + 2;
    }
}

btn.addEventListener('click', () => {
    const val = input.value;

    if (val) {
        localStorage.setItem('savedWord', val);
        createLetters(val);
    }
});

resetBtn.addEventListener('click', () => {
    letters.forEach(l => {
        l.x = l.initialX;
        l.y = l.initialY;
        l.el.style.left = l.x + 'px';
        l.el.style.top = l.y + 'px';
        l.selected = false;
    });
    updateSelection();
});

input.addEventListener('input', () => {
    localStorage.setItem('savedWord', input.value);
});

document.addEventListener('mousedown', (e) => {
    if (e.target.tagName === 'INPUT' || e.target.tagName === 'BUTTON') return;

    hasMoved = false;

    if (e.target.classList.contains('letter')) {
        const index = letters.findIndex(l => l.el === e.target);
        if (index === -1) return;

        clickedLetter = letters[index];

        if (e.ctrlKey) {
            clickedLetter.selected = !clickedLetter.selected;
            updateSelection();
        }
        else if (!clickedLetter.selected) {
            letters.forEach(l => l.selected = false);
            clickedLetter.selected = true;
            updateSelection();
        }

        isDragging = true;
        startX = e.clientX;
        startY = e.clientY;

        dragOffsets = letters.filter(l => l.selected).map(l => ({
            l,
            originalX: l.x,
            originalY: l.y,
            offsetX: l.x - e.clientX,
            offsetY: l.y - e.clientY
        }));

        e.preventDefault();
    }
    else {
        isSelecting = true;
        startX = e.clientX;
        startY = e.clientY;
        selectionBox.hidden = false;
        selectionBox.style.left = startX + 'px';
        selectionBox.style.top = startY + 'px';
        selectionBox.style.width = '0px';
        selectionBox.style.height = '0px';

        if (!e.ctrlKey) {
            letters.forEach(l => l.selected = false);
            updateSelection();
        }
        e.preventDefault();
    }
});

document.addEventListener('mousemove', (e) => {
    if (isDragging || isSelecting) {
        hasMoved = true;
    }

    if (isDragging) {
        dragOffsets.forEach(item => {
            item.l.x = e.clientX + item.offsetX;
            item.l.y = e.clientY + item.offsetY;
            item.l.el.style.left = item.l.x + 'px';
            item.l.el.style.top = item.l.y + 'px';
        });
    }
    else if (isSelecting) {
        const currentX = e.clientX;
        const currentY = e.clientY;
        const left = Math.min(startX, currentX);
        const top = Math.min(startY, currentY);
        const width = Math.abs(currentX - startX);
        const height = Math.abs(currentY - startY);

        selectionBox.style.left = left + 'px';
        selectionBox.style.top = top + 'px';
        selectionBox.style.width = width + 'px';
        selectionBox.style.height = height + 'px';

        letters.forEach(l => {
            const lRight = l.x + l.width;
            const lBottom = l.y + l.height;
            if (l.x < left + width && lRight > left && l.y < top + height && lBottom > top) {
                l.selected = true;
            }
        });
        updateSelection();
    }
});

document.addEventListener('mouseup', (e) => {
    if (isDragging) {
        if (!hasMoved && clickedLetter && !e.ctrlKey) {
            clickedLetter.selected = !clickedLetter.selected;
            updateSelection();
        }
        else if (dragOffsets.length === 1 && hasMoved) {
            const draggedItem = dragOffsets[0];
            const targetX = e.clientX;
            const targetY = e.clientY;

            const dropTarget = letters.find(l => {
                if (l === draggedItem.l) return false;

                return targetX >= l.x && targetX <= l.x + l.width &&
                    targetY >= l.y && targetY <= l.y + l.height;
            });

            if (dropTarget) {
                dropTarget.x = draggedItem.originalX;
                dropTarget.y = draggedItem.originalY;
                dropTarget.el.style.left = dropTarget.x + 'px';
                dropTarget.el.style.top = dropTarget.y + 'px';
            }
        }

        isDragging = false;
        dragOffsets = [];
        clickedLetter = null;
    }

    if (isSelecting) {
        isSelecting = false;
        selectionBox.hidden = true;
    }
});

function updateSelection() {
    letters.forEach(l => {
        if (l.selected) {
            l.el.classList.add('selected');
        }
        else {
            l.el.classList.remove('selected');
        }
    });
}

init();