/**
 * SMTP Client Error Handler
 * Error classification and recovery strategies
 */
import { SmtpErrorType } from './constants.js';
import { logDebug } from './utils/logging.js';
export class SmtpErrorHandler {
    options;
    constructor(options) {
        this.options = options;
    }
    /**
     * Classify error type based on response or error
     */
    classifyError(error, context) {
        logDebug('Classifying error', this.options, { errorMessage: error instanceof Error ? error.message : String(error), context });
        // Handle Error objects
        if (error instanceof Error) {
            return this.classifyErrorByMessage(error);
        }
        // Handle SMTP response codes
        if (typeof error === 'object' && 'code' in error) {
            return this.classifyErrorByCode(error.code);
        }
        return SmtpErrorType.UNKNOWN_ERROR;
    }
    /**
     * Determine if error is retryable
     */
    isRetryable(errorType, response) {
        switch (errorType) {
            case SmtpErrorType.CONNECTION_ERROR:
            case SmtpErrorType.TIMEOUT_ERROR:
                return true;
            case SmtpErrorType.PROTOCOL_ERROR:
                // Only retry on temporary failures (4xx codes)
                return response ? response.code >= 400 && response.code < 500 : false;
            case SmtpErrorType.AUTHENTICATION_ERROR:
            case SmtpErrorType.TLS_ERROR:
            case SmtpErrorType.SYNTAX_ERROR:
            case SmtpErrorType.MAILBOX_ERROR:
            case SmtpErrorType.QUOTA_ERROR:
                return false;
            default:
                return false;
        }
    }
    /**
     * Get retry delay for error type
     */
    getRetryDelay(attempt, errorType) {
        const baseDelay = 1000; // 1 second
        const maxDelay = 30000; // 30 seconds
        // Exponential backoff with jitter
        const delay = Math.min(baseDelay * Math.pow(2, attempt - 1), maxDelay);
        const jitter = Math.random() * 0.1 * delay; // 10% jitter
        return Math.floor(delay + jitter);
    }
    /**
     * Create enhanced error with context
     */
    createError(message, errorType, context, originalError) {
        const error = new Error(message);
        error.type = errorType;
        error.context = context;
        error.originalError = originalError;
        return error;
    }
    classifyErrorByMessage(error) {
        const message = error.message.toLowerCase();
        if (message.includes('timeout') || message.includes('etimedout')) {
            return SmtpErrorType.TIMEOUT_ERROR;
        }
        if (message.includes('connect') || message.includes('econnrefused') ||
            message.includes('enotfound') || message.includes('enetunreach')) {
            return SmtpErrorType.CONNECTION_ERROR;
        }
        if (message.includes('tls') || message.includes('ssl') ||
            message.includes('certificate') || message.includes('handshake')) {
            return SmtpErrorType.TLS_ERROR;
        }
        if (message.includes('auth')) {
            return SmtpErrorType.AUTHENTICATION_ERROR;
        }
        return SmtpErrorType.UNKNOWN_ERROR;
    }
    classifyErrorByCode(code) {
        if (code >= 500) {
            // Permanent failures
            if (code === 550 || code === 551 || code === 553) {
                return SmtpErrorType.MAILBOX_ERROR;
            }
            if (code === 552) {
                return SmtpErrorType.QUOTA_ERROR;
            }
            if (code === 500 || code === 501 || code === 502 || code === 504) {
                return SmtpErrorType.SYNTAX_ERROR;
            }
            return SmtpErrorType.PROTOCOL_ERROR;
        }
        if (code >= 400) {
            // Temporary failures
            if (code === 450 || code === 451 || code === 452) {
                return SmtpErrorType.QUOTA_ERROR;
            }
            return SmtpErrorType.PROTOCOL_ERROR;
        }
        return SmtpErrorType.UNKNOWN_ERROR;
    }
}
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