// index.js
(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD
        define([], factory);
    } else if (typeof module === 'object' && module.exports) {
        // CommonJS
        module.exports = factory();
    } else {
        // 全局变量
        root.UtmTracker = factory();
    }
}(this, function () {
    'use strict';
    
    // 工具函数
    function getUrlParam(name) {
        var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)');
        var r = window.location.search.substr(1).match(reg);
        if (r != null) return decodeURIComponent(r[2]);
        return null;
    }
    
    // 获取浏览器信息
    function getBrowserInfo() {
        var ua = navigator.userAgent;
        var browser = 'Unknown';
        var isMobile = /Mobile|Android|iPhone|iPad|iPod|HarmonyOS|HMS/i.test(ua);
        var osType = 'Unknown';
        var osVersion = 'Unknown';

        // 系统类型和版本号判断
        if (/iPhone|iPad|iPod/i.test(ua)) {
            osType = 'iOS';
            var iosVersionMatch = ua.match(/OS (\d+)[_.](\d+)?([_.](\d+))?/i);
            if (iosVersionMatch) {
                osVersion = iosVersionMatch[1];
                if (iosVersionMatch[2]) osVersion += '.' + iosVersionMatch[2];
                if (iosVersionMatch[4]) osVersion += '.' + iosVersionMatch[4];
            }
        } else if (/Android/i.test(ua)) {
            osType = 'Android';
            var androidVersionMatch = ua.match(/Android ([\d.]+)/i);
            if (androidVersionMatch) {
                osVersion = androidVersionMatch[1];
            }
        } else if (/HarmonyOS|HMS/i.test(ua)) {
            osType = 'HarmonyOS';
            var harmonyVersionMatch = ua.match(/HarmonyOS[\s/]?([\d.]+)/i) || ua.match(/HMSCore[\s/]?([\d.]+)/i);
            if (harmonyVersionMatch) {
                osVersion = harmonyVersionMatch[1];
            }
        }

        // 浏览器类型判断
        if (/Edg/i.test(ua)) {
            browser = 'Edge';
        } else if (/HuaweiBrowser/i.test(ua) || /HMS/i.test(ua)) {
            browser = 'HuaweiBrowser';
        } else if (/Chrome/i.test(ua)) {
            browser = 'Chrome';
        } else if (/Firefox/i.test(ua)) {
            browser = 'Firefox';
        } else if (/Safari/i.test(ua) && !/Chrome/i.test(ua) && !/Edg/i.test(ua)) {
            browser = 'Safari';
        } else if (/MSIE|Trident/i.test(ua)) {
            browser = 'IE';
        }

        // 特殊浏览器环境检测
        if (/MicroMessenger/i.test(ua)) {
            browser = 'WeChat';
        } else if (/QQBrowser/i.test(ua)) {
            browser = 'QQBrowser';
        } else if (/UCBrowser/i.test(ua)) {
            browser = 'UCBrowser';
        } else if (/Telegram/i.test(ua)) {
            browser = 'Telegram';
        }

        return {
            isMobile: isMobile,
            browser: browser,
            userAgent: ua,
            osType: osType,
            osVersion: osVersion
        };
    }
    

    //获取上一级url
    function getPreviousUrl() {
        let referrer = document.referrer;
        if (referrer) {
            return referrer;
        } 
        // else if (window.history.length > 1) {
        //     // 如果有历史记录
        //     window.history.back();
        //     return window.location.href;
        // } else {
        //     // 如果没有历史记录
        //     return null;
        // }
    }
    // 主类
    function UtmTracker(config) {
        this.config = Object.assign({
            reportUrl: '', // 上报地址
            autoSend: true, // 是否自动上报
            method: 'POST', // 请求方式
            headers: { 'Content-Type': 'application/json' }, // 请求头
            extra: {}, // 额外参数
        }, config || {});
        if (this.config.autoSend && this.config.reportUrl) {
            this.send();
        }
    }
    
    // 获取UTM参数
    UtmTracker.prototype.getParams = function() {
        const browser = getBrowserInfo()
        const params = {
            utm_source: getUrlParam('utm_source') || '',
            utm_medium: getUrlParam('utm_medium') || '',
            utm_campaign: getUrlParam('utm_campaign') || '',
            utm_term: getUrlParam('utm_term') || '',
            utm_content: getUrlParam('utm_content') || '',
            referrer: getPreviousUrl() || '',
            timestamp: new Date().toISOString(),
            url: window.location.href,
            isMobile: browser.isMobile,
            browser: browser.browser,
            userAgent: browser.ua,
            osType: browser.osType,
            osVersion: browser.osVersion
        };
        // 合并额外参数
        let result = params;
        if (this.config && this.config.extra && typeof this.config.extra === 'object') {
            result = Object.assign({}, params, this.config.extra);
        }
        if (typeof this.config.onParams === 'function') {
            this.config.onParams(result);
        }
        return result;
    };

    // 发送请求
    UtmTracker.prototype.send = function (data) {
        const cfg = this.config || {};
        const payload = data || this.getParams();
        console.log(payload);

        if (!cfg.reportUrl) return;
        fetch(cfg.reportUrl, {
            method: 'POST',
            headers: cfg.headers || { 'Content-Type': 'application/json' },
            body: JSON.stringify(payload)
        })
            .then(res => {
                // 假设res为Response对象，需要解析json
                if (typeof res.json === 'function') {
                    res.json().then(data => {
                        if (data.downloadUrl) {

                            // 倒计时弹窗
                            let countdown = 3;
                            const countdownMask = document.createElement('div');
                            countdownMask.style.position = 'fixed';
                            countdownMask.style.top = 0;
                            countdownMask.style.left = 0;
                            countdownMask.style.width = '100vw';
                            countdownMask.style.height = '100vh';
                            countdownMask.style.background = 'rgba(0,0,0,0.5)';
                            countdownMask.style.zIndex = 9999;
                            countdownMask.style.display = 'flex';
                            countdownMask.style.alignItems = 'center';
                            countdownMask.style.justifyContent = 'center';

                            const countdownModal = document.createElement('div');
                            countdownModal.style.background = '#fff';
                            countdownModal.style.borderRadius = '8px';
                            countdownModal.style.padding = '32px 48px';
                            countdownModal.style.fontSize = '20px';
                            countdownModal.style.boxShadow = '0 2px 16px rgba(0,0,0,0.2)';
                            countdownModal.style.display = 'flex';
                            countdownModal.style.flexDirection = 'column';
                            countdownModal.style.alignItems = 'center';

                            const text = document.createElement('div');
                            text.innerText = `即将跳转，${countdown}秒...`;
                            countdownModal.appendChild(text);
                            countdownMask.appendChild(countdownModal);
                            document.body.appendChild(countdownMask);

                            const timer = setInterval(() => {
                                countdown--;
                                text.innerText = `即将跳转，${countdown}秒...`;
                                if (countdown <= 0) {
                                    clearInterval(timer);
                                    document.body.removeChild(countdownMask);
                                    // 跳转
                                    console.log(data.downloadUrl);
                                    window.location.href = data.downloadUrl
                                    return
                                }
                            }, 1000);
                            return
                            // 创建遮罩
                            const mask = document.createElement('div');
                            mask.style.position = 'fixed';
                            mask.style.top = 0;
                            mask.style.left = 0;
                            mask.style.width = '100vw';
                            mask.style.height = '100vh';
                            mask.style.background = 'rgba(0,0,0,0.5)';
                            mask.style.zIndex = 9999;
                            mask.style.display = 'flex';
                            mask.style.alignItems = 'center';
                            mask.style.justifyContent = 'center';

                            // 弹窗容器
                            const modal = document.createElement('div');
                            modal.style.background = '#fff';
                            modal.style.borderRadius = '8px';
                            modal.style.padding = '24px';
                            modal.style.maxWidth = '90vw';
                            modal.style.maxHeight = '90vh';
                            modal.style.boxShadow = '0 2px 16px rgba(0,0,0,0.2)';
                            modal.style.position = 'relative';
                            modal.style.display = 'flex';
                            modal.style.flexDirection = 'column';
                            modal.style.alignItems = 'center';

                            // 关闭按钮
                            const closeBtn = document.createElement('button');
                            closeBtn.innerText = '关闭';
                            closeBtn.style.position = 'absolute';
                            closeBtn.style.top = '8px';
                            closeBtn.style.right = '8px';
                            closeBtn.style.background = '#f44336';
                            closeBtn.style.color = '#fff';
                            closeBtn.style.border = 'none';
                            closeBtn.style.borderRadius = '4px';
                            closeBtn.style.padding = '4px 12px';
                            closeBtn.style.cursor = 'pointer';
                            closeBtn.onclick = function () {
                                document.body.removeChild(mask);
                            };
                            modal.appendChild(closeBtn);

                            // 内容区
                            let contentEl;
                            if (data.type === 'video') {
                                contentEl = document.createElement('video');
                                contentEl.src = data.downloadUrl;
                                contentEl.controls = true;
                                contentEl.autoplay = true;
                                contentEl.style.maxWidth = '80vw';
                                contentEl.style.maxHeight = '70vh';
                            } else if (data.type === 'audio') {
                                contentEl = document.createElement('audio');
                                contentEl.src = data.downloadUrl;
                                contentEl.controls = true;
                                contentEl.autoplay = true;
                                contentEl.style.width = '100%';
                            } else if (data.type === 'image') {
                                contentEl = document.createElement('img');
                                contentEl.src = data.downloadUrl;
                                contentEl.style.maxWidth = '80vw';
                                contentEl.style.maxHeight = '70vh';
                            } else {
                                contentEl = document.createElement('a');
                                contentEl.href = data.downloadUrl;
                                contentEl.innerText = '下载文件';
                                contentEl.target = '_blank';
                            }
                            modal.appendChild(contentEl);
                            mask.appendChild(modal);
                            document.body.appendChild(mask);
                        }
                    });
                }
            })
            .catch(err => {
                console.log(err);

            });
    };
    
    // 静态方法：快速获取（无需实例化）
    UtmTracker.get = function (config) {
        const tracker = new UtmTracker(config);
        const params = tracker.getParams();
        if (config && config.autoSend && config.reportUrl) {
            tracker.send(params);
        }
        return params;
    };
    
    return UtmTracker;
}));