/**
 * DOM Polyfill for uniapp
 * 为uniapp提供DOM API的polyfill，解决document.getElementById等DOM操作不支持的问题
 */

// 检查是否在uniapp环境中
const isUniApp = typeof uni !== 'undefined'

// 如果不在H5环境且没有document对象，创建polyfill
if (isUniApp && !window.document) {
    console.log('Creating DOM polyfill for uniapp environment')

    // 创建document对象
    window.document = {
        // 存储元素
        _elements: {},
        _elementIdCounter: 0,

        // 创建元素
        createElement: function(tagName) {
            const element = {
                tagName: tagName.toLowerCase(),
                id: '',
                className: '',
                style: {},
                parentNode: null,
                childNodes: [],
                innerHTML: '',
                innerText: '',
                textContent: '',
                attributes: {},
                appendChild: function(child) {
                    child.parentNode = this
                    this.childNodes.push(child)
                },
                removeChild: function(child) {
                    const index = this.childNodes.indexOf(child)
                    if (index > -1) {
                        this.childNodes.splice(index, 1)
                        child.parentNode = null
                    }
                },
                getAttribute: function(name) {
                    return this.attributes[name] || null
                },
                setAttribute: function(name, value) {
                    this.attributes[name] = value
                    if (name === 'id') {
                        this.id = value
                        window.document._elements[value] = this
                    }
                },
                addEventListener: function(event, handler) {
                    // 在uniapp中，事件处理可能需要特殊处理
                    console.log(`Element ${this.tagName} listening for ${event}`)
                },
                removeEventListener: function(event, handler) {
                    console.log(`Element ${this.tagName} removed listener for ${event}`)
                }
            }

            return element
        },

        // 根据ID获取元素
        getElementById: function(id) {
            return this._elements[id] || null
        },

        // 根据类名获取元素
        getElementsByClassName: function(className) {
            const elements = []
            for (const id in this._elements) {
                if (this._elements[id].className.includes(className)) {
                    elements.push(this._elements[id])
                }
            }
            return elements
        },

        // 根据标签名获取元素
        getElementsByTagName: function(tagName) {
            const elements = []
            for (const id in this._elements) {
                if (this._elements[id].tagName === tagName.toLowerCase()) {
                    elements.push(this._elements[id])
                }
            }
            return elements
        },

        // 查询选择器
        querySelector: function(selector) {
            // 简单的ID选择器支持
            if (selector.startsWith('#')) {
                return this.getElementById(selector.substring(1))
            }
            return null
        },

        querySelectorAll: function(selector) {
            // 简单的ID选择器支持
            if (selector.startsWith('#')) {
                const element = this.getElementById(selector.substring(1))
                return element ? [element] : []
            }
            return []
        },

        // 创建文本节点
        createTextNode: function(text) {
            return {
                nodeType: 3,
                nodeValue: text,
                textContent: text
            }
        },

        // 添加元素到body
        body: {
            appendChild: function(element) {
                console.log('Appending element to body:', element.tagName)
                    // 在uniapp中，可能需要特殊处理
            }
        },

        // 文档状态
        readyState: 'complete',

        // 添加事件监听器
        addEventListener: function(event, handler) {
            console.log(`Document listening for ${event}`)
        },

        // 移除事件监听器
        removeEventListener: function(event, handler) {
            console.log(`Document removed listener for ${event}`)
        }
    }

    // 创建body元素
    window.document.body = window.document.createElement('body')
    window.document.body.id = 'body'
    window.document._elements['body'] = window.document.body

    // 创建documentElement
    window.document.documentElement = window.document.createElement('html')
    window.document.documentElement.id = 'html'
    window.document._elements['html'] = window.document.documentElement

    console.log('DOM polyfill created successfully')
}

// 如果document存在但某些方法不存在，补充这些方法
if (window.document) {
    // 补充可能缺失的方法
    if (!window.document.createElement) {
        window.document.createElement = function(tagName) {
            const element = {
                tagName: tagName.toLowerCase(),
                id: '',
                className: '',
                style: {},
                parentNode: null,
                childNodes: [],
                innerHTML: '',
                innerText: '',
                textContent: '',
                attributes: {},
                appendChild: function(child) {
                    child.parentNode = this
                    this.childNodes.push(child)
                },
                setAttribute: function(name, value) {
                    this.attributes[name] = value
                    if (name === 'id') {
                        this.id = value
                        if (window.document._elements) {
                            window.document._elements[value] = this
                        }
                    }
                }
            }
            return element
        }
    }

    if (!window.document.getElementById) {
        window.document.getElementById = function(id) {
            if (window.document._elements) {
                return window.document._elements[id] || null
            }
            return null
        }
    }

    if (!window.document.body) {
        window.document.body = window.document.createElement('body')
    }

    if (!window.document.documentElement) {
        window.document.documentElement = window.document.createElement('html')
    }

    if (!window.document.readyState) {
        window.document.readyState = 'complete'
    }
}

// 确保window对象存在
if (typeof window === 'undefined') {
    global.window = global
}

// 确保navigator对象存在
if (typeof navigator === 'undefined') {
    global.navigator = {
        userAgent: 'uniapp',
        platform: 'uniapp'
    }
}

// 确保location对象存在
if (typeof location === 'undefined') {
    global.location = {
        href: 'uniapp://',
        protocol: 'uniapp:',
        host: 'uniapp',
        hostname: 'uniapp',
        port: '',
        pathname: '/',
        search: '',
        hash: ''
    }
}

console.log('DOM polyfill loaded successfully')