// ==UserScript==
// @name         发票数据自动填充（支持TXT导入/粘贴+持久化）
// @namespace    http://tampermonkey.net/
// @version      1.2
// @description  从TXT文件或粘贴文本导入数据，自动保存进度
// @match        https://inv-veri.chinatax.gov.cn/*
// @grant        GM_setValue
// @grant        GM_getValue
// ==/UserScript==

(function() {
    // 全局变量
    let invoicesArray = [];
    let currentIndex = 0;
    let statusSpan;
    let nextBtn, prevBtn;

    // 初始化UI界面
    function initUI() {
        const uiDiv = document.createElement('div');
        uiDiv.style.cssText = `
            position: fixed;
            bottom: 10px;
            right: 10px;
            background: #fff;
            padding: 8px;
            border: 1px solid #ccc;
            z-index: 9999;
            font-family: Arial, sans-serif;
            width: 260px;
            font-size: 12px;
        `;

        // 创建按钮样式
        const buttonStyle = `
            padding: 3px 8px;
            margin: 2px;
            font-size: 12px;
            line-height: 1.2;
        `;

        // 文件上传区域
        const fileInput = document.createElement('input');
        fileInput.type = 'file';
        fileInput.accept = '.txt';
        fileInput.style.marginBottom = '10px';

        // 文本粘贴区域
        const pasteArea = document.createElement('textarea');
        pasteArea.placeholder = '或直接粘贴发票数据（每行一个）...';
        pasteArea.style.width = '100%';
        pasteArea.style.height = '40px';
        pasteArea.style.marginBottom = '10px';

        // 操作按钮
        const loadBtn = document.createElement('button');
        loadBtn.textContent = '加载数据';
        loadBtn.style.cssText = buttonStyle;

        const clearBtn = document.createElement('button');
        clearBtn.textContent = '清空数据';
        clearBtn.style.cssText = buttonStyle;

        // 翻页控制区域
        const navDiv = document.createElement('div');
        navDiv.style.marginTop = '10px';

        prevBtn = document.createElement('button');
        prevBtn.textContent = '上一条 (P)';
        prevBtn.style.cssText = buttonStyle;

        nextBtn = document.createElement('button');
        nextBtn.textContent = '下一条 (Z)';
        nextBtn.style.cssText = buttonStyle;

        statusSpan = document.createElement('span');
        statusSpan.style.margin = '0 10px';

        // 组装UI组件
        uiDiv.appendChild(fileInput);
        uiDiv.appendChild(pasteArea);
        uiDiv.appendChild(document.createElement('br'));
        uiDiv.appendChild(loadBtn);
        uiDiv.appendChild(clearBtn);
        navDiv.appendChild(prevBtn);
        navDiv.appendChild(statusSpan);
        navDiv.appendChild(nextBtn);
        uiDiv.appendChild(navDiv);
        document.body.appendChild(uiDiv);

        return { fileInput, pasteArea, loadBtn, clearBtn };
    }

    // 保存数据到本地存储
    function saveData() {
        localStorage.setItem('invoiceData', JSON.stringify({
            data: invoicesArray,
            index: currentIndex
        }));
    }

    // 填充输入框
    function fillInput(index) {
        const input = document.querySelector('#fpdm');
        if (!input) return alert('错误：未找到发票代码输入框！');

        input.value = invoicesArray[index];
        input.dispatchEvent(new Event('input', { bubbles: true }));
        updateStatus();
        saveData();
    }

    // 更新状态显示
    function updateStatus() {
        statusSpan.textContent = `${currentIndex + 1}/${invoicesArray.length}`;
    }

    // 加载上一条数据
    function loadPrevious() {
        if (currentIndex > 0) {
            currentIndex--;
            fillInput(currentIndex);
        } else {
            alert('已经是第一条数据！');
        }
    }

    // 加载下一条数据
    function loadNext() {
        if (currentIndex < invoicesArray.length - 1) {
            currentIndex++;
            fillInput(currentIndex);
        } else {
            alert('已经是最后一条数据！');
        }
    }

    // 加载数据（从文件或粘贴文本）
    function loadData(source, content) {
        if (!content) return alert('错误：数据为空！');

        invoicesArray = content.split('\n')
            .map(line => line.trim())
            .filter(line => line.length > 0);

        if (invoicesArray.length === 0) {
            return alert('错误：未找到有效数据！');
        }

        currentIndex = 0;
        fillInput(currentIndex);
    }

    // 主函数
    function main() {
        const { fileInput, pasteArea, loadBtn, clearBtn } = initUI();

        // 设置快捷键监听
        document.addEventListener('keydown', (e) => {
            if (!e.ctrlKey && !e.shiftKey && e.altKey) {
                if (e.key.toLowerCase() === 'p') loadPrevious();
                if (e.key.toLowerCase() === 'z') loadNext();
            }
        });

        // 绑定按钮事件
        prevBtn.addEventListener('click', loadPrevious);
        nextBtn.addEventListener('click', loadNext);

        loadBtn.addEventListener('click', () => {
            if (pasteArea.value.trim()) {
                loadData('paste', pasteArea.value.trim());
            } else if (fileInput.files[0]) {
                fileInput.files[0].text().then(content => {
                    loadData('file', content);
                });
            } else {
                alert('请先上传文件或粘贴文本！');
            }
        });

        clearBtn.addEventListener('click', () => {
            invoicesArray = [];
            currentIndex = 0;
            localStorage.removeItem('invoiceData');
            statusSpan.textContent = '未加载数据';
            pasteArea.value = '';
            fileInput.value = '';
        });

        // 尝试加载本地存储的数据
        const savedData = localStorage.getItem('invoiceData');
        if (savedData) {
            try {
                const { data, index } = JSON.parse(savedData);
                invoicesArray = data;
                currentIndex = index;
                updateStatus();
            } catch (e) {
                console.error('加载本地数据失败:', e);
            }
        } else {
            statusSpan.textContent = '未加载数据';
        }
    }

    // 页面加载完成后执行
    if (document.readyState === 'complete') {
        main();
    } else {
        document.addEventListener('DOMContentLoaded', main);
    }
})();