const fs = require('fs');
const path = require('path');
const chalk = require('chalk');

class Logger {
    constructor(level = 'INFO') {
        this.logLevels = ['INFO', 'WARN', 'ERROR'];
        this.level = level.toUpperCase();

        // 默认日志目录 ./logs
        this.logDir = path.resolve(process.cwd(), 'logs');
        if (!fs.existsSync(this.logDir)) {
            fs.mkdirSync(this.logDir, { recursive: true });
        }
    }

    // 获取当天日志文件路径
    getLogFilePath() {
        const dateStr = new Date().toISOString().split('T')[0]; // YYYY-MM-DD
        return path.join(this.logDir, `${dateStr}.log`);
    }

    log(level, message) {
        level = level.toUpperCase();
        if (this.logLevels.indexOf(level) >= this.logLevels.indexOf(this.level)) {
            const timestamp = new Date().toLocaleString();
            const logMessage = `${timestamp} [${level}] ${message}`;

            // 控制台颜色
            let coloredMessage;
            switch (level) {
                case 'INFO':
                    coloredMessage = chalk.white(logMessage);
                    break;
                case 'WARN':
                    coloredMessage = chalk.yellow(logMessage);
                    break;
                case 'ERROR':
                    coloredMessage = chalk.red(logMessage);
                    break;
                default:
                    coloredMessage = logMessage;
            }

            console.log(coloredMessage);

            // 保存到文件
            const logFilePath = this.getLogFilePath();
            fs.appendFile(logFilePath, `${logMessage}\n`, (err) => {
                if (err) console.error(chalk.red(`日志写入失败: ${err.message}`));
            });
        }
    }

    info(message) {
        this.log('INFO', message);
    }

    warn(message) {
        this.log('WARN', message);
    }

    error(message) {
        this.log('ERROR', message);
    }
}

module.exports = Logger;