// 添加常量定义
const ARROW_WIDTH = 155;
const ARROW_HEIGHT = 173;
const STOP_DISTANCE = 50;
document.addEventListener('DOMContentLoaded', function() {
    const backgroundContainer = document.querySelector('.background-container');
    const imageButtons = document.querySelectorAll('.image-btn');
    const markCenterBtn = document.getElementById('markCenterBtn');
    const startAnimationBtn = document.getElementById('startAnimationBtn');
    const resetBtn = document.getElementById('resetBtn');
    const contextMenu = document.getElementById('contextMenu');
    const deleteArrow = document.getElementById('deleteArrow');
    let selectedArrow = null;
    let centerDot = null;
    
    // 添加重置按钮事件监听器
    resetBtn.addEventListener('click', function() {
        location.reload();
    });
    
    // 添加开始按钮事件监听器
    startAnimationBtn.addEventListener('click', startAnimation);

    // 动画控制函数
    function startAnimation() {
        if (!centerDot) {
            alert('请先确定中心点');
            return;
        }

        const centerRect = centerDot.getBoundingClientRect();
        const containerRect = backgroundContainer.getBoundingClientRect();
        const centerX = centerRect.left - containerRect.left;
        const centerY = centerRect.top - containerRect.top;

        const arrows = document.querySelectorAll('.arrow-container');
        if (arrows.length === 0) {
            alert('没有可移动的箭头');
            return;
        }

        arrows.forEach(arrow => {
            animateArrow(arrow, centerX, centerY);
        });
    }
    

    // 修改全局偏移量输入框事件监听
    const globalStopDistanceInput = document.getElementById('global-stop-distance');
    
    // 初始化全局偏移量(从localStorage加载或使用默认值)
    const savedGlobalStopDistance = localStorage.getItem('globalStopDistance');
    if (savedGlobalStopDistance) {
        globalStopDistanceInput.value = savedGlobalStopDistance;
    }
    
    // 全局偏移量变更事件 - 保存到localStorage无需选中箭头
    globalStopDistanceInput.addEventListener('input', function() {
        const globalValue = this.value;
        localStorage.setItem('globalStopDistance', globalValue);
        console.log(`[全局设置] 箭头停止距离: ${globalValue}px`);
    });
    

    
    // 单个箭头动画函数
    function animateArrow(arrow, targetX, targetY) {
        const arrowWidth = ARROW_WIDTH;
        const arrowHeight = ARROW_HEIGHT;
        const centerOffsetX = arrowWidth / 2;
        const centerOffsetY = arrowHeight / 2;
        // 使用全局偏移量替换单个箭头的stopDistance
        const stopDistance = parseInt(document.getElementById('global-stop-distance').value) || STOP_DISTANCE;
    
        const rect = arrow.getBoundingClientRect();
        const containerRect = backgroundContainer.getBoundingClientRect();
        let currentX = rect.left - containerRect.left + centerOffsetX;
        let currentY = rect.top - containerRect.top + centerOffsetY;

        const offsetRange = 20;
        const randomOffsetX = (Math.random() - 0.5) * offsetRange;
        const randomOffsetY = (Math.random() - 0.5) * offsetRange;
        const finalTargetX = targetX + randomOffsetX;
        const finalTargetY = targetY + randomOffsetY;

        const dxTotal = finalTargetX - currentX;
        const dyTotal = finalTargetY - currentY;
        const distanceTotal = Math.sqrt(dxTotal * dxTotal + dyTotal * dyTotal);

        let adjustedTargetX, adjustedTargetY;
        if (distanceTotal > stopDistance) {
            const ratio = (distanceTotal - stopDistance) / distanceTotal;
            adjustedTargetX = currentX + dxTotal * ratio;
            adjustedTargetY = currentY + dyTotal * ratio;
        } else {
            adjustedTargetX = currentX;
            adjustedTargetY = currentY;
        }

        function updatePosition() {
            const dx = adjustedTargetX - currentX;
            const dy = adjustedTargetY - currentY;
            const distance = Math.sqrt(dx * dx + dy * dy);

            if (distance < 2) {
                arrow.style.left = (adjustedTargetX - centerOffsetX) + 'px';
                arrow.style.top = (adjustedTargetY - centerOffsetY) + 'px';
                return;
            }

            const step = Math.max(distance * 0.05, 1);
            const moveX = (dx / distance) * step;
            const moveY = (dy / distance) * step;

            currentX += moveX;
            currentY += moveY;
            arrow.style.left = (currentX - centerOffsetX) + 'px';
            arrow.style.top = (currentY - centerOffsetY) + 'px';

            requestAnimationFrame(updatePosition);
        }

        updatePosition();
    }
    
    // 加载保存的元素
    loadAllElements();

    // 绑定箭头按钮事件
    imageButtons.forEach(button => {
        button.addEventListener('click', () => {
            const imagePath = button.getAttribute('data-image');
            addImageToContainer(imagePath);
        });
    });

    // 右键菜单事件
    deleteArrow.addEventListener('click', function() {
        if (selectedArrow) {
            selectedArrow.remove();
            saveAllElements();
            contextMenu.style.display = 'none';
            selectedArrow = null;
        }
    });

    // 为匹配角菜单项添加事件监听器
    document.querySelectorAll('.menu-item').forEach(item => {
        item.addEventListener('click', function() {
            if (selectedArrow) {
                const referencePoint = this.getAttribute('data-point');
                selectedArrow.dataset.referencePoint = referencePoint;
                saveAllElements();
                contextMenu.style.display = 'none';
                selectedArrow = null;
            }
        });
    });

    // 点击空白处关闭菜单
    document.addEventListener('click', function() {
        contextMenu.style.display = 'none';
        selectedArrow = null;
    });

    // 标记中心点功能
    markCenterBtn.addEventListener('click', function() {
        if (centerDot) {
            centerDot.remove();
            centerDot = null;
        }

        function handleMapClick(e) {
            const rect = backgroundContainer.getBoundingClientRect();
            const x = e.clientX - rect.left;
            const y = e.clientY - rect.top;

            centerDot = document.createElement('div');
            centerDot.className = 'center-dot';
            centerDot.style.left = x + 'px';
            centerDot.style.top = y + 'px';

            backgroundContainer.appendChild(centerDot);
            backgroundContainer.removeEventListener('click', handleMapClick);
            
            console.log('[中心点] 已标记中心点:', { left: centerDot.style.left, top: centerDot.style.top });
            saveAllElements();
        }

        backgroundContainer.addEventListener('click', handleMapClick);
    });

    // 添加箭头函数
    function addImageToContainer(imagePath, position = null, textContent = '') {
        const container = document.createElement('div');
        container.className = 'arrow-container';
        container.dataset.imagePath = imagePath;

        const newImage = document.createElement('div');
        newImage.className = 'arrow-image';
        newImage.style.backgroundImage = `url('${imagePath}')`;

        container.appendChild(newImage);

        // 添加文字元素
        if (textContent) {
            const textElement = document.createElement('div');
            textElement.className = 'arrow-text';
            textElement.textContent = textContent;
            container.dataset.text = textContent;
            container.appendChild(textElement);
        }

        // 设置位置
        const arrowWidth = ARROW_WIDTH;
        const arrowHeight = ARROW_HEIGHT;
        const centerOffsetX = arrowWidth / 2;
        const centerOffsetY = arrowHeight / 2;

        if (position) {
            container.style.left = parseFloat(position.left) + 'px';
            container.style.top = parseFloat(position.top) + 'px';
            if (position.referencePoint) {
                container.dataset.referencePoint = position.referencePoint;
            }
            if (position.stopDistance) {
                container.dataset.stopDistance = position.stopDistance;
            }
        } else {
            const x = Math.random() * (backgroundContainer.offsetWidth - arrowWidth) + centerOffsetX;
            const y = Math.random() * (backgroundContainer.offsetHeight - arrowHeight) + centerOffsetY;
            container.style.left = (x - centerOffsetX) + 'px';
            container.style.top = (y - centerOffsetY) + 'px';
        }

        // 双击编辑文字
        container.addEventListener('dblclick', (e) => {
            e.stopPropagation();
            const currentText = container.dataset.text || '';
            // 使用layui layer.prompt替换原生prompt
            layer.prompt({
                title: '请输入文字',
                value: currentText,
                formType: 3, // 文本输入框类型
                area: ['300px', 'auto'] // 定义弹窗宽度
            }, function(value, index, elem){
                if (value !== null) {
                    if (value.trim() === '') {
                        container.querySelector('.arrow-text')?.remove();
                        delete container.dataset.text;
                    } else {
                        let textElement = container.querySelector('.arrow-text');
                        if (!textElement) {
                            textElement = document.createElement('div');
                            textElement.className = 'arrow-text';
                            container.appendChild(textElement);
                        }
                        textElement.textContent = value;
                        container.dataset.text = value;
                        saveAllElements();
                    }
                }
                layer.close(index); // 关闭弹窗
            });
        });

        // 右键菜单支持
        container.addEventListener('contextmenu', function(e) {
            e.preventDefault();
            selectedArrow = this;
            contextMenu.style.left = `${e.clientX}px`;
            contextMenu.style.top = `${e.clientY}px`;
            contextMenu.style.display = 'block';
            
            const currentPoint = selectedArrow.dataset.referencePoint || 'top-left';
            document.querySelectorAll('.menu-item').forEach(item => {
                const checkMark = item.querySelector('.check-mark');
                if (!checkMark) return;
                checkMark.textContent = item.getAttribute('data-point') === currentPoint ? '✓' : '';
            });
        });

        // 拖拽功能
        let isDragging = false;
        let offsetX, offsetY;

        newImage.addEventListener('mousedown', startDrag);

        function startDrag(e) {
            e.preventDefault();
            isDragging = true;
            selectedArrow = container;
            container.style.zIndex = '10';
            
            const rect = container.getBoundingClientRect();
            offsetX = e.clientX - rect.left;
            offsetY = e.clientY - rect.top;

            document.addEventListener('mousemove', drag);
            document.addEventListener('mouseup', stopDrag);
        }

        function drag(e) {
            if (!isDragging) return;
            const containerRect = backgroundContainer.getBoundingClientRect();
            const x = e.clientX - containerRect.left - offsetX;
            const y = e.clientY - containerRect.top - offsetY;

            container.style.left = x + 'px';
            container.style.top = y + 'px';
        }

        function stopDrag() {
            if (isDragging) {
                isDragging = false;
                container.style.zIndex = '1';
                saveAllElements();
                document.removeEventListener('mousemove', drag);
                document.removeEventListener('mouseup', stopDrag);
            }
        }

        backgroundContainer.appendChild(container);
        saveAllElements();
        return container;
    }

    // 保存所有元素状态
    function saveAllElements() {
        const elements = [];
        
        // 保存中心点
        if (centerDot) {
            localStorage.setItem('centerPoint', JSON.stringify({
                left: centerDot.style.left,
                top: centerDot.style.top
            }));
        } else {
            localStorage.removeItem('centerPoint');
        }
        
        // 保存箭头(移除stopDistance属性)
        document.querySelectorAll('.arrow-container').forEach(arrow => {
            elements.push({
                type: 'arrow',
                imagePath: arrow.dataset.imagePath,
                left: arrow.style.left,
                top: arrow.style.top,
                text: arrow.dataset.text || '',
                referencePoint: arrow.dataset.referencePoint || 'top-left'
                // 删除stopDistance属性
            });
        });
        
        localStorage.setItem('savedElements', JSON.stringify(elements));
        console.log('[保存] 已保存元素:', elements);
    }

    // 加载所有元素状态
    function loadAllElements() {
        // 加载中心点
        const savedCenter = localStorage.getItem('centerPoint');
        if (savedCenter) {
            const center = JSON.parse(savedCenter);
            centerDot = document.createElement('div');
            centerDot.className = 'center-dot';
            centerDot.style.left = center.left;
            centerDot.style.top = center.top;
            backgroundContainer.appendChild(centerDot);
        }
        
        // 加载箭头
        const savedElements = localStorage.getItem('savedElements');
        if (savedElements) {
            const elements = JSON.parse(savedElements);
            elements.forEach(element => {
                if (element.type === 'arrow') {
                    // Fix image path by adding 'images/' prefix if missing
                    if (!element.imagePath.startsWith('images/')) {
                        element.imagePath = `images/${element.imagePath}`;
                    }
                    addImageToContainer(element.imagePath, element, element.text);
                }
            });
            console.log('[加载] 已加载元素:', elements);
        }
    }

    // 阻止右键菜单冒泡
    contextMenu.addEventListener('click', function(e) {
        e.stopPropagation();
    });
});