const axios = require('axios');

class UsernameGen {
    constructor() {
        this.headers = {
            referer: 'https://usernamegenerator.com/',
            'user-agent': 'Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Mobile Safari/537.36'
        };
    }
    
    validate(input, fieldName) {
        if (!input) throw new Error(`${fieldName} is required`);
        if (!/^[a-zA-Z0-9]+$/.test(input)) throw new Error(`${fieldName} must contain only letters and numbers (no spaces or special characters)`);
        
        return input;
    }
    
    create = async function (keyword, { mode = 'instans', theme = 'action' } = {}) {
        try {
            keyword = this.validate(keyword, 'Keyword');
            
            const conf = {
                modes: ['instans', 'ai'],
                themes: ['action', 'adventure', 'fantasy', 'historical', 'horror', 'mythology', 'nature', 'sci-fi', 'strategy']
            };
            
            if (!conf.modes.includes(mode)) throw new Error(`Available modes: ${conf.modes.join(', ')}`);
            
            if (mode === 'instans') {
                const { data } = await axios.get(`https://usernamegenerator.com/wk/gamertags/${keyword}`, {
                    headers: this.headers
                });
                
                return data;
            } else {
                if (!conf.themes.includes(theme)) throw new Error(`Available themes: ${conf.themes.join(', ')}`);
                const { data } = await axios.post('https://usernamegenerator.com/ai/generate/player-names', {
                    genre: theme,
                    keywords: keyword
                }, {
                    headers: this.headers
                });
                
                return data;
            }
        } catch (error) {
            throw new Error(error.message);
        }
    }
    
    mix = async function (name1, name2) {
        try {
            name1 = this.validate(name1, 'Name1');
            name2 = this.validate(name2, 'Name2');
            
            const { data } = await axios.get(`https://usernamegenerator.com/wk/mix-words/${name1}-${name2}`, {
                headers: this.headers
            });
            
            return data;
        } catch (error) {
            throw new Error(error.message);
        }
    }
}

// Usage:
const u = new UsernameGen();
const resp = await u.create('rynn', { mode: 'ai', theme: 'fantasy' });
console.log(resp);