import axios from 'axios';
import config from '../../config/index.js';

/**
 * AI平台接口类
 * 定义了所有AI平台需要实现的方法
 */
class AIProvider {
    /**
     * 生成文章
     * @param {string} content - 生成文章的提示内容
     * @returns {Promise<string>} - 返回生成的文章JSON字符串
     */
    async generateArticle(content) {
        throw new Error('Method not implemented');
    }
}

/**
 * 火山云AI平台实现
 */
class VolcesAIProvider extends AIProvider {
    /**
     * 创建火山云AI提供者实例
     * @param {string} version - 版本号，如'1.5'或'1.6'
     */
    constructor(version = '1-5') {
        super();
        
        // 根据版本选择对应的API密钥和模型
        const versionConfig = {
            '1-5': {
                apikey: config.huoshancloud.apikeyHLR,
                model: "doubao-1-5-pro-32k-250115"
            },
            '1-6': {
                apikey: config.huoshancloud.apikeyHLR,
                model: "doubao-seed-1-6-250615"
            },
        };
        
        // 获取当前版本的配置，如果版本不存在则使用1.5版本
        const currentConfig = versionConfig[version] || versionConfig['1-5'];
        
        this.version = version;
        this.headers = {
            'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.65 Safari/537.36',
            "Authorization": "Bearer " + currentConfig.apikey,
            "Content-Type": "application/json"
        };
        this.url = "https://ark.cn-beijing.volces.com/api/v3/chat/completions";
        this.model = currentConfig.model;
    }

    async generateArticle(content) {
        const postJSON = {
            "model": this.model,
            "messages": [
                {
                    "role": "user",
                    "content": content,
                }
            ]
        };

        try {
            console.log(`火山云${this.version}`);
            const response = await axios.post(encodeURI(this.url), postJSON, { headers: this.headers });
            return response.data.choices[0].message.content;
        } catch (error) {
            console.error("VolcesAI API error:", error);
            throw error;
        }
    }
}

// 为了保持向后兼容性，创建1.5和1.6版本的类别名
class VolcesAIProvider1_5 extends VolcesAIProvider {
    constructor() {
        super('1-5');
    }
}

class VolcesAIProvider1_6 extends VolcesAIProvider {
    constructor() {
        super('1-6');
    }
}

/**
 * OpenAI平台实现
 */
class OpenAIProvider extends AIProvider {
    constructor() {
        super();
        this.headers = {
            "Authorization": "Bearer " + config.openai.apikey,
            "Content-Type": "application/json"
        };
        this.url = "https://api.openai.com/v1/chat/completions";
        this.model = "gpt-3.5-turbo";
    }

    async generateArticle(content) {
        const postJSON = {
            "model": this.model,
            "messages": [
                {
                    "role": "user",
                    "content": content,
                }
            ]
        };

        try {
            const response = await axios.post(this.url, postJSON, { headers: this.headers });
            return response.data.choices[0].message.content;
        } catch (error) {
            console.error("OpenAI API error:", error);
            throw error;
        }
    }
}

/**
 * 百度文心一言平台实现
 */
class BaiduAIProvider extends AIProvider {
    constructor() {
        super();
        this.headers = {
            "Content-Type": "application/json"
        };
        this.url = "https://aip.baidubce.com/rpc/2.0/ai_custom/v1/wenxinworkshop/chat/completions";
        this.model = "ernie-bot-4";
        this.accessToken = null;
    }

    async getAccessToken() {
        if (this.accessToken) return this.accessToken;
        
        const tokenUrl = `https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=${config.baidu.apiKey}&client_secret=${config.baidu.secretKey}`;
        
        try {
            const response = await axios.post(tokenUrl);
            this.accessToken = response.data.access_token;
            return this.accessToken;
        } catch (error) {
            console.error("Baidu access token error:", error);
            throw error;
        }
    }

    async generateArticle(content) {
        const accessToken = await this.getAccessToken();
        const apiUrl = `${this.url}?access_token=${accessToken}`;
        
        const postJSON = {
            "model": this.model,
            "messages": [
                {
                    "role": "user",
                    "content": content,
                }
            ]
        };

        try {
            const response = await axios.post(apiUrl, postJSON, { headers: this.headers });
            return response.data.result;
        } catch (error) {
            console.error("Baidu AI API error:", error);
            throw error;
        }
    }
}

/**
 * AI提供者工厂类
 * 根据配置创建不同的AI平台实例
 */
class AIProviderFactory {
    /**
     * 获取AI提供者实例
     * @param {string} provider - AI提供者名称，如'volces', 'volces1-5', 'volces1-6', 'openai', 'baidu'
     * @returns {AIProvider} - 返回对应的AI提供者实例
     */
    static getProvider(provider = 'volces1-5') {
        const providerLower = provider.toLowerCase();
        
        // 处理火山云通用提供者格式：volces:版本号
        if (providerLower.startsWith('volces:')) {
            const version = providerLower.split(':')[1];
            return new VolcesAIProvider(version);
        }
        
        // 处理传统提供者名称
        switch (providerLower) {
            case 'volces':
            case 'volces1-5':
                return new VolcesAIProvider1_5('1-5');
            case 'volces1-6':
                return new VolcesAIProvider1_6('1-6');
            case 'openai':
                return new OpenAIProvider();
            case 'baidu':
                return new BaiduAIProvider();
            default:
                return new VolcesAIProvider('1-5'); // 默认使用火山云1.5
        }
    }
}

/**
 * 生成文章的主函数
 * @param {string} content - 生成文章的提示内容
 * @param {string} provider - AI提供者名称，默认为'volces'
 * @returns {Promise<string>} - 返回生成的文章JSON字符串
 */
export async function generateArticle(content, provider = 'volces1-5') {
    try {
        const aiProvider = AIProviderFactory.getProvider(provider);
        const result = await aiProvider.generateArticle(content);
        return result;
    } catch (error) {
        console.error("Generate article error:", error);
        throw error;
    }
}

/**
 * 计算两个字符串之间的Levenshtein距离（编辑距离）
 * @param {string} a - 第一个字符串
 * @param {string} b - 第二个字符串
 * @returns {number} - 编辑距离
 */
function levenshteinDistance(a, b) {
    const matrix = [];
    
    // 初始化矩阵
    for (let i = 0; i <= b.length; i++) {
        matrix[i] = [i];
    }
    
    for (let j = 0; j <= a.length; j++) {
        matrix[0][j] = j;
    }
    
    // 填充矩阵
    for (let i = 1; i <= b.length; i++) {
        for (let j = 1; j <= a.length; j++) {
            if (b.charAt(i - 1) === a.charAt(j - 1)) {
                matrix[i][j] = matrix[i - 1][j - 1];
            } else {
                matrix[i][j] = Math.min(
                    matrix[i - 1][j - 1] + 1, // 替换
                    matrix[i][j - 1] + 1,     // 插入
                    matrix[i - 1][j] + 1      // 删除
                );
            }
        }
    }
    
    return matrix[b.length][a.length];
}

/**
 * 增强FormsOfWords，检测文章中单词的变形形式和拼写错误
 * @param {Object} jsonObj - 解析后的JSON对象
 * @param {string} userWords - 用户提供的单词列表，逗号分隔
 * @returns {Object} - 增强后的JSON对象
 */
export function enhanceFormsOfWords(jsonObj, userWords) {
    if (!jsonObj || !userWords) return jsonObj;
    
    // 将用户提供的单词转换为数组并去除空格
    const userWordsList = userWords.split(',').map(word => word.trim().toLowerCase());
    
    // 如果没有ArticleEnglish或FormsOfWords，直接返回
    if (!jsonObj.ArticleEnglish || !Array.isArray(jsonObj.ArticleEnglish)) {
        return jsonObj;
    }
    
    // 确保FormsOfWords存在
    if (!jsonObj.FormsOfWords) {
        jsonObj.FormsOfWords = [];
    }
    
    // 从文章中提取所有单词
    const allWordsInArticle = [];
    jsonObj.ArticleEnglish.forEach(sentence => {
        // 移除标点符号，分割成单词
        const words = sentence.toLowerCase()
            .replace(/[.,\/#!$%\^&\*;:{}=\-_`~()]/g, " ")
            .replace(/\s+/g, " ")
            .split(" ");
        
        words.forEach(word => {
            if (word) allWordsInArticle.push(word.trim());
        });
    });
    
    // 常见的后缀列表
    const commonSuffixes = [
        'ed', 'ing', 's', 'es', 'er', 'est', 'ful', 'ly', 'ment', 'ness', 'ity', 
        'tion', 'sion', 'ation', 'able', 'ible', 'al', 'ial', 'ic', 'ical', 'ious', 
        'ous', 'ive', 'less', 'y'
    ];
    
    // 不规则动词变化表（部分常见的）
    const irregularVerbs = {
        'go': ['went', 'gone', 'goes', 'going'],
        'be': ['am', 'is', 'are', 'was', 'were', 'been', 'being'],
        'do': ['did', 'done', 'does', 'doing'],
        'have': ['has', 'had', 'having'],
        'say': ['said', 'says', 'saying'],
        'make': ['made', 'makes', 'making'],
        'take': ['took', 'taken', 'takes', 'taking'],
        'come': ['came', 'comes', 'coming'],
        'see': ['saw', 'seen', 'sees', 'seeing'],
        'know': ['knew', 'known', 'knows', 'knowing'],
        'get': ['got', 'gotten', 'gets', 'getting'],
        'give': ['gave', 'given', 'gives', 'giving'],
        'find': ['found', 'finds', 'finding'],
        'think': ['thought', 'thinks', 'thinking'],
        'tell': ['told', 'tells', 'telling'],
        'become': ['became', 'becomes', 'becoming'],
        'show': ['showed', 'shown', 'shows', 'showing'],
        'leave': ['left', 'leaves', 'leaving'],
        'feel': ['felt', 'feels', 'feeling'],
        'put': ['puts', 'putting'],
        'bring': ['brought', 'brings', 'bringing'],
        'begin': ['began', 'begun', 'begins', 'beginning'],
        'keep': ['kept', 'keeps', 'keeping'],
        'hold': ['held', 'holds', 'holding'],
        'write': ['wrote', 'written', 'writes', 'writing'],
        'stand': ['stood', 'stands', 'standing'],
        'hear': ['heard', 'hears', 'hearing'],
        'let': ['lets', 'letting'],
        'mean': ['meant', 'means', 'meaning'],
        'set': ['sets', 'setting'],
        'meet': ['met', 'meets', 'meeting'],
        'run': ['ran', 'runs', 'running'],
        'pay': ['paid', 'pays', 'paying'],
        'sit': ['sat', 'sits', 'sitting'],
        'speak': ['spoke', 'spoken', 'speaks', 'speaking'],
        'lie': ['lay', 'lain', 'lies', 'lying'],
        'lead': ['led', 'leads', 'leading'],
        'read': ['read', 'reads', 'reading'],
        'sleep': ['slept', 'sleeps', 'sleeping'],
        'win': ['won', 'wins', 'winning'],
        'understand': ['understood', 'understands', 'understanding'],
        'draw': ['drew', 'drawn', 'draws', 'drawing'],
        'sing': ['sang', 'sung', 'sings', 'singing'],
        'fall': ['fell', 'fallen', 'falls', 'falling'],
        'fly': ['flew', 'flown', 'flies', 'flying'],
        'grow': ['grew', 'grown', 'grows', 'growing'],
        'lose': ['lost', 'loses', 'losing'],
        'teach': ['taught', 'teaches', 'teaching'],
        'eat': ['ate', 'eaten', 'eats', 'eating'],
        'drink': ['drank', 'drunk', 'drinks', 'drinking']
    };
    
    // 不规则形容词比较级和最高级
    const irregularAdjectives = {
        'good': ['better', 'best'],
        'bad': ['worse', 'worst'],
        'far': ['further', 'furthest', 'farther', 'farthest'],
        'little': ['less', 'least'],
        'many': ['more', 'most'],
        'much': ['more', 'most']
    };
    
    // 收集所有单词形式
    const allForms = new Set();
    
    userWordsList.forEach(originalWord => {
        // 添加原始单词
        allForms.add(originalWord);
        
        // 检查不规则动词
        if (irregularVerbs[originalWord]) {
            irregularVerbs[originalWord].forEach(form => allForms.add(form));
        }
        
        // 检查不规则形容词
        if (irregularAdjectives[originalWord]) {
            irregularAdjectives[originalWord].forEach(form => allForms.add(form));
        }
        
        // 检查文章中的所有单词，寻找可能的变形和拼写错误
        allWordsInArticle.forEach(articleWord => {
            // 检查是否是原始单词
            if (articleWord === originalWord) {
                allForms.add(articleWord);
                return;
            }
            
            // 检查拼写错误，使用更严格的条件
            // 1. 对于短单词（长度<=4），只接受编辑距离为1的情况
            // 2. 对于中等长度单词（4<长度<=8），只接受编辑距离为1的情况
            // 3. 对于长单词（长度>8），允许编辑距离为2，但有额外限制
            if (originalWord.length <= 8) {
                // 短单词和中等长度单词使用相同的严格条件
                if (articleWord[0] === originalWord[0] && // 首字母必须相同
                    Math.abs(articleWord.length - originalWord.length) <= 1 && // 长度差不超过1
                    levenshteinDistance(originalWord, articleWord) === 1) { // 编辑距离恰好为1
                    allForms.add(articleWord);
                }
            } else {
                // 长单词（长度>8）的条件
                if (articleWord[0] === originalWord[0]) { // 首字母必须相同
                    const editDistance = levenshteinDistance(originalWord, articleWord);
                    
                    if (editDistance === 1) {
                        // 编辑距离为1的情况，长度差不超过1
                        if (Math.abs(articleWord.length - originalWord.length) <= 1) {
                            allForms.add(articleWord);
                        }
                    } else if (editDistance === 2) {
                        // 编辑距离为2的情况，需要更严格的条件
                        // 长度差不超过1且单词长度大于8
                        if (Math.abs(articleWord.length - originalWord.length) <= 1) {
                            allForms.add(articleWord);
                        }
                    }
                }
            }
            
            // 检查是否是通过添加后缀形成的变形
            for (const suffix of commonSuffixes) {
                if (articleWord.endsWith(suffix)) {
                    const stem = articleWord.slice(0, -suffix.length);
                    
                    // 处理双写字母的情况（如：running -> run）
                    if (stem.length > 0 && stem[stem.length-1] === stem[stem.length-2]) {
                        const possibleStem = stem.slice(0, -1);
                        if (possibleStem === originalWord) {
                            allForms.add(articleWord);
                            continue;
                        }
                    }
                    
                    // 处理去e加ing的情况（如：writing -> write）
                    if (suffix === 'ing' && originalWord.endsWith('e') && stem + 'e' === originalWord) {
                        allForms.add(articleWord);
                        continue;
                    }
                    
                    // 处理y变i的情况（如：studies -> study）
                    if ((suffix === 'es' || suffix === 'ed') && originalWord.endsWith('y') && 
                        stem + 'y' === originalWord) {
                        allForms.add(articleWord);
                        continue;
                    }
                    
                    // 直接比较
                    if (stem === originalWord) {
                        allForms.add(articleWord);
                    }
                }
            }
        });
    });
    
    // 更新FormsOfWords
    jsonObj.FormsOfWords = Array.from(new Set([...jsonObj.FormsOfWords, ...allForms]));
    
    return jsonObj;
}

/**
 * 校验和修复JSON结构
 * @param {string} jsonString - JSON字符串
 * @returns {string} - 修复后的JSON字符串
 */
export function validateAndFixJSON(jsonString) {
    try {
        //console.log(jsonString);
        // 解析JSON字符串为对象
        let jsonObj = JSON.parse(jsonString);
        
        // 校验和修复Question数组中的每个问题对象
        if (jsonObj.Question && Array.isArray(jsonObj.Question)) {
            jsonObj.Question = jsonObj.Question.map(question => {
                // 创建一个修复后的问题对象
                const fixedQuestion = {};
                
                // 确保QuestionEnglish字段存在
                if (question.QuestionEnglish) {
                    fixedQuestion.QuestionEnglish = question.QuestionEnglish;
                }
                
                // 检查QuestionChinese字段，如果不存在但有第二个QuestionEnglish，则使用它
                if (question.QuestionChinese) {
                    fixedQuestion.QuestionChinese = question.QuestionChinese;
                } else if (Object.keys(question).filter(key => key === 'QuestionEnglish').length > 1) {
                    // 找到第二个QuestionEnglish的值
                    const keys = Object.keys(question);
                    let foundFirst = false;
                    for (const key of keys) {
                        if (key === 'QuestionEnglish') {
                            if (foundFirst) {
                                fixedQuestion.QuestionChinese = question[key];
                                break;
                            }
                            foundFirst = true;
                        }
                    }
                }
                
                // 确保OptionsEnglish字段存在且为数组
                if (question.OptionsEnglish && Array.isArray(question.OptionsEnglish)) {
                    fixedQuestion.OptionsEnglish = question.OptionsEnglish;
                } else {
                    fixedQuestion.OptionsEnglish = ["A.", "B.", "C.", "D."];
                }
                
                // 确保OptionsChinese字段存在且为数组
                if (question.OptionsChinese && Array.isArray(question.OptionsChinese)) {
                    fixedQuestion.OptionsChinese = question.OptionsChinese;
                } else {
                    fixedQuestion.OptionsChinese = ["A.", "B.", "C.", "D."];
                }
                
                // 确保Answer字段存在
                if (question.Answer) {
                    fixedQuestion.Answer = question.Answer;
                } else {
                    fixedQuestion.Answer = "A";
                }
                
                return fixedQuestion;
            });
        }
        
        // 确保其他必要字段存在
        if (!jsonObj.ArticleEnglish || !Array.isArray(jsonObj.ArticleEnglish)) {
            jsonObj.ArticleEnglish = ["No content available"];
        }
        
        if (!jsonObj.ArticleChinese || !Array.isArray(jsonObj.ArticleChinese)) {
            jsonObj.ArticleChinese = ["无可用内容"];
        }
        
        if (!jsonObj.FormsOfWords || !Array.isArray(jsonObj.FormsOfWords)) {
            jsonObj.FormsOfWords = [];
        } else {
            // 处理FormsOfWords数组，提取所有单词
            const processedFormsOfWords = [];
            
            for (const item of jsonObj.FormsOfWords) {
                if (typeof item !== 'string') {
                    continue; // 跳过非字符串项
                }
                
                // 处理冒号分隔格式："word1: word2"
                if (item.includes(':')) {
                    const [leftWord, rightWord] = item.split(':').map(word => word.trim());
                    if (leftWord) processedFormsOfWords.push(leftWord);
                    if (rightWord) processedFormsOfWords.push(rightWord);
                    continue;
                }
                
                // 处理括号分隔格式："word1(word2)" 或 "word1(word2, word3)"
                const bracketMatch = item.match(/^([^(]+)\(([^)]+)\)$/);
                if (bracketMatch) {
                    const outsideWord = bracketMatch[1].trim();
                    const insideWords = bracketMatch[2].split(',').map(word => word.trim());
                    
                    if (outsideWord) processedFormsOfWords.push(outsideWord);
                    for (const word of insideWords) {
                        if (word) processedFormsOfWords.push(word);
                    }
                    continue;
                }
                
                // 如果不符合上述格式，检查是否包含逗号
                if (item.includes(',')) {
                    // 如果包含逗号，按逗号分割并添加每个单词
                    const words = item.split(',').map(word => word.trim());
                    for (const word of words) {
                        if (word) processedFormsOfWords.push(word);
                    }
                } else {
                    // 单个单词，直接添加
                    processedFormsOfWords.push(item);
                }
            }
            
            // 去除空字符串并去重
            const uniqueFormsOfWords = [...new Set(processedFormsOfWords.filter(word => word))];
            
            // 用去重后的数组替换原数组
            jsonObj.FormsOfWords = uniqueFormsOfWords;
        }
        
        // 将修复后的对象转回JSON字符串
        return JSON.stringify(jsonObj);
    } catch (jsonError) {
        console.error("JSON解析或修复错误:", jsonError);
        // 如果解析失败，保留原始结果
        return jsonString;
    }
}

export default {
    generateArticle,
    enhanceFormsOfWords,
    validateAndFixJSON
};